WO2012163740A2 - Board cutting saw comprising a safety signal device - Google Patents

Abstract

The invention relates to a board cutting saw comprising a workpiece support surface, a sawing unit which is preferably arranged below the sawing slot, is mounted so as to be movable along the sawing slot, and includes a circular saw blade that is preferably rotatably mounted on the sawing unit below the workpiece support surface and penetrates the sawing slot in a sawing position. According to the invention, a signal control unit and an illumination device are provided. The illumination device is coupled to the control unit via signal technology and is arranged on a stop or in the area of or above the workpiece support surface. The invention is characterized in that in order to control the illumination device, the signal control unit is designed in such a way that the illumination device is activated in accordance with a processing step being carried out on the board cutting saw.

Description

 Panel sizing saw with safety signal device

The invention relates to a panel sizing, comprising a workpiece support surface, a saw unit, which is preferably arranged below the Sägeschlitzes and movably mounted along the Sägeschlitzes, with a circular saw blade, which is preferably rotatably mounted on the saw unit below the workpiece support surface and projects in a sawing through the Sägeschlitz ,

A first problem with such panel sizing saws is that the operation of such panel sizing saws, on the one hand, involves the risk of operator injuries to the clamping surfaces or the circular saw blade when operating the saw, for example when positioning a workpiece in the region of the saw kerf. On the other hand, the operation by preventive security measures often in their sequence consuming and thus time-consuming, which adversely affects the efficiency of working with such panel sizing. The invention has for its object to propose a panel sizing, which allows for increased safety a more efficient operation.

Another problem associated with such panel sizing saws is that prior art panel sizing saws can reliably clamp a workpiece by means of a pressure beam extending in the longitudinal direction of the kerf, the rapid succession of saw cuts on multiple workpieces and the clamping of very small workpieces but is not achieved by these panel sizing in a satisfactory manner. The invention has for its object to provide a Plattenaufteilsä- GE, which allows for the processing of multiple workpieces and the processing of smaller workpieces a more efficient operation.

Yet another problem encountered with such panel sizing saws is that shielding of the saw blade is desirable to prevent the escape of sawdust and to prevent injury, but such shielding often obstructs and delays the operations of the panel sizing saw. In addition, a panel sizing saw of the prior art can often not achieve reliable shielding if a workpiece extends only over a portion of the kerf, but another portion of the kerf is not covered by the workpiece. Another object of the present invention is to provide a panel sizing saw which provides a screen which works efficiently for the operations of the sawing operations and which can ensure occupational safety in a better manner than heretofore.

According to the invention, a panel sizing saw of the type described in the introduction is proposed, which is characterized by a signal control unit and a signaling device coupled to this control unit, which is arranged on a stop or in the region of or above the workpiece support surface, and characterized in that the signal control unit controls the signal control unit Lighting device is designed in such a way that the lighting device is activated in response to the implementation of a running on the panel sizing saw processing step.

With the panel-sizing saw according to the invention, an advantageous signal control unit and a light-emitting device coupled thereto are proposed. This lighting device is arranged in the region of a stop, on a stop or in the region above the workpiece support surface or in the region of the workpiece support surface and is thus located directly in a region observed by the user. This arrangement has the advantage over other signaling devices, such as illuminated operation buttons or control lamps in the range of actuators, that the user recognizes the signaling in such an area, in which there is also a risk or relevant for the operation of the panel sizing process information. Thus, with the inventive arrangement of the luminaire tion on the one hand enables a hazard situation to be signaled to the user by a lighting device by means of clamping operations or by sawing operations directly in the area of the action taking place, that is in the area of the circular saw blade or in the region of a tensioning element. On the other hand, by the lighting device according to the invention a simplification of operation can be achieved by the lighting device signals processing operations, for example. The use of a specific stop by corresponding light signaling the user indicates an upcoming processing step as the clamping of a workpiece or the placement of a workpiece in a particular area corresponding light signaling in the field of clamping or the systems displays to the user or for such processing steps provides a targeted illumination of a range that must be optically checked / monitored for precise positioning of a workpiece by the user. According to the invention, the signal control unit is designed such that it activates the lighting device in dependence on the execution of a processing step. This operation specifically increases the work efficiency and the danger prevention by an automatic activation of the signal lighting devices dependent on the work sequence on the panel sizing saw. This avoids, on the one hand, as is often observed with permanent flashing warning devices, that the warning function for the user loses significance after a habituation phase. On the other hand, the process-dependent activation achieves a guiding function for the user with which the processing sequence on the panel-sizing saw can be accelerated by specific instructions to the user.

According to a first preferred embodiment, it is provided that the lighting device comprises at least two differently colored lighting means, which are signal-technically coupled to the signal control unit in such a way that they can be individually activated. With this development of the lighting device is introduced for the user quickly detectable and at the same time well differentiated signaling mode, which can also rely on conventional signal colors for certain functions. Thus, for example, the signal color yellow or red can be used for an imminent or existing danger situation, whereas the signal colors green or blue can be used, for example, for workflow instructions, positioning instructions or the like. By providing two different signal colors according to the invention, it is possible to indicate alternately or simultaneously both a first function and a second function or dangerous situation. It should be understood that the two differently colored lamps on the one hand alternately, On the other hand, can also be activated simultaneously to thereby additionally expand the possibilities of signaling by a third, generated by mixing signal color. In addition, more than two different color lighting devices can be provided, for example, three or four different color bulbs.

It is also preferable that the lighting device extends along the kerf and comprises a plurality of light sources which are spaced apart in the direction of the longitudinal extent of the kerf and signal-technically coupled to the signal control unit so that they can be activated individually. With this training, a specific advantageous arrangement of the lighting device is defined. By the extension of the lighting device along the kerf numerous beneficial warning functions and flow functions of the lighting device can be performed. The lighting device may be to implement this longitudinal arrangement, in particular in the range of a pressure bar, which is arranged above the kerf on the panel sizing saw, alternatively, the lighting device may also be embedded in the workpiece support surface and parallel to the kerf adjacent thereto. In principle, the lighting device can emit its light directly or indirectly. The lighting device comprises a plurality of lighting means, which are arranged side by side in the longitudinal direction of the kerf. These bulbs can be designed as a light bar, for example. As a chain of LEDs in a LED bar. The arrangement of the bulbs next to each other is advantageous in order to signal positions or areas that are located on or along the kerf with the bulbs. In this case, lamps of different colors can be provided in connection with the preferred embodiment explained above. These lamps of different colors can in turn be arranged side by side in the longitudinal direction of the kerf, but can also be arranged such that two or more lamps of different colors are arranged at a position with respect to this longitudinal direction of the kerf and such double or multiple arrangements of lamps of different colors then are again arranged side by side in the longitudinal direction of the kerf in the lighting device.

The lighting device proposed in this way is particularly suitable for signaling the position of the saw blade in real time, for example by the lighting means following in the manner of a running light the traveling saw blade. Furthermore, with this specifically developed lighting device, the display of areas in which a factory or is the area can be shown in which a workpiece is to be created for a saw cut to be made, thereby facilitating the operation for the user and to speed up work processes. Finally, this specific orientation and arrangement of the lighting device may serve to illuminate the area of immediate importance for set-up and quality inspection operations directly in the region of the kerf.

Still further, it is preferred that the signal control unit has an input interface for inputting a saw unit position signal characterizing the saw unit position and is designed to control the lighting unit as a function of this saw unit position signal. In principle, the position of the saw unit can be indicated by a saw unit position signal, which is generated from a machine control which, for example, also controls the actuator for moving the saw unit. Likewise, a signal could be input via the interface that is generated by a sensor that detects the saw unit position, to input this position to the signal control unit. The training is particularly suitable to work in conjunction with the previously explained training with a plurality of bulbs along the longitudinal extension of the kerf, cooperate. In this case, the saw blade position resulting from the saw unit position signal can be signaled by means of the lighting device. It should be understood that either the position of the saw unit in general or the position of a saw blade arranged on the saw blade and / or scoring saw blade is signaled by the lighting device. In this case, the position of the saw unit can be understood to mean, on the one hand, the position in the horizontal direction along the saw slot, alternatively or additionally, the position in the vertical direction, in order to also signal a lowering or raising of the saw unit by the lighting unit.

It is even further preferred that the signal control unit is designed to activate in each case only those lamps or group of lamps which are arranged in the region of the saw unit position. This form of training signals the position of the saw unit in a manner that is easy for the user to understand and is therefore well suited for carrying out a warning function for the prevention of injuries. Still further, it is preferable that the input interface is signally coupled to a sensor for detecting the saw unit position or to a memory device for storing a sequence program of the panel sizing saw for inputting the saw unit position. This embodiment is particularly efficient in reliably communicating the stored or sensor-detected saw unit position with the signal control unit without the need for sensitive or additional components.

According to a further preferred embodiment, it is provided that the signal control unit has an input interface for inputting a clamping element signal characterizing the activation of a tension element and is designed to control the lighting device in dependence on this tension element signal. With this training, it is possible that by means of the lighting device directed to the clamping elements or a single clamping element of the panel sizing signal is signaled to the user. Thus, for example, the position of a clamping element can be signaled by means of the lighting device, the imminent activation of a clamping element or the successful activation of a clamping element to indicate to the user, at which point a workpiece is stretched. This training is particularly suitable in combination with the lighting device, which extends along the Sägeschlitzes to indicate the position of clamping elements, which are distributed along the Sägeschlitzes. It is particularly suitable for displaying clamping elements which are arranged at irregular intervals from one another along the saw slot. It should be understood that the tensioning element signal with respect to a single tensioning element, a group of tensioning elements or all the tensioning elements can describe a position, an intended activation or a successful activation.

Furthermore, the panel dividing saw according to the invention can be developed by a plurality of clamping elements extending along the kerf and further characterized in that the signal control unit is designed to activate only those bulbs or group of bulbs which are arranged in the region of a clamping element, which is or will be activated. With this training, a simplification of the operations on the panel sizing is achieved by the user the upcoming or successful activation of a clamping element, ie the clamping of a workpiece in a particular area of the kerf is displayed. It is even further preferred for the signal control unit to have an interface for inputting a sequence program which contains the abutment position of a workpiece in the region above the kerf and the signal control unit is designed to only each such luminous means or group of luminous means of a plurality of To activate lighting means of the lighting device, which are arranged in the region of the installation position, in particular which define the installation position. With this training, the workflow on the panel dividing saw according to the invention is further simplified by a user by a quickly detectable signaling of the area in which he is to place a workpiece on the workpiece support surface is displayed. For this purpose, in turn, in particular, a lighting device is suitable, which has a plurality of along the Sägeschlitzes spaced light source. Thus, for example, by activating all lamps in the area in which the workpiece is to be placed, the desired position can be simply signaled, alternatively, those bulbs, which define the positions at which the edges of the workpiece to come to rest, activated in order to allow a quick and correct support of the workpiece. In this case, according to this embodiment, the signal control unit is provided in particular with an interface which allows the reading of a sequence program. Such a sequence program may, for example, describe a plurality of processing steps to be carried out on a starting material for producing a plurality of plates cut therefrom. Such a sequence program can serve, for example, for the execution of a PLC control and contains information which successively includes the installation position, the clamping elements to be activated and the sequence of installation, clamping, saw cut for several successive cutting operations.

According to a further preferred embodiment it is provided that the lighting device at least two mutually different functions from the selection: signaling the saw blade position or saw unit position, signaling the activation of the saw unit or the rotation of a main saw blade or a Vorritzsäge- blade, signaling the imminent or successful activation of Clamping element, signaling the abutment position of a workpiece that each signaling function is assigned a signaling color of at least two different signaling colors and / or a signaling timing as a flashing light and the signal control unit is designed to depend on each signal to be signaled Function to activate a luminous means having the signaling color assigned to this function.

With this development, the lighting device is used for two or more different functions and in this case the user is presented in a safe and quickly detectable manner the respective function in which a signaling color associated with the function is output at the lighting device. It should be understood that not necessarily each function can be assigned an individual signaling color different from the other functions, but also a double use of a single signaling color and / or a signaling clock for two different functions can be used from the logical sequence of steps this can be recognized by the user in logical contexts of the workflows as a unique feature identifier. Furthermore, due to additional geometrical arrangements of the luminous means or the individually activated luminous means, such a dual use of one color can take place for two different functions, if the geometry of the activated luminous means results in a differentiation of the two functions despite the user's matching signaling color. According to a further preferred embodiment, it is provided that the lighting device is arranged on a safety bridge, which is arranged above the workpiece support surface and at least one clamping element for clamping a workpiece between a vertically movable clamping surface of the clamping element and the workpiece support surface. Such an arrangement of the lighting device on a safety bridge, which is located above the workpiece support surface, and on which one or more clamping elements are arranged for clamping the workpiece against the workpiece support surface, a rapid detection of the lighting device can be ensured by the user of the panel sizing. The safety bridge preferably extends in the longitudinal direction of the kerf and above this kerf, thereby achieving effective clamping of the workpieces in the immediate region of the kerf.

According to a further preferred embodiment, it is provided to further the above-described panel sizing saw or the above-described embodiments according to the invention by a safety bridge which is arranged in the region of the saw slot above the workpiece support surface and a plurality of in Having longitudinal extent of the saw slot spaced apart and individually controllable clamping elements for clamping a workpiece between a vertically movable clamping surface of the respective clamping element and the workpiece support surface. With such a plurality of clamping elements can be achieved over the prior art much more flexible clamping of one or more workpieces on the workpiece support surface of the panel sizing. So it is on the one hand possible to clamp several workpieces at spaced positions above the kerf by the clamping elements and further it is possible to selectively release some of these workpieces or all workpieces from the chuck, to place them, for example. New and after re-clamping another Saw cut to perform. In addition, a better clamping of small workpieces can be achieved by the plurality of clamping elements by only those clamping elements are activated for this purpose, which are located directly above the workpiece.

In this case, it is particularly preferred if the group of clamping elements have a first and a second clamping element, which are arranged at a first distance from each other, and have a third clamping element, which is arranged at a second, different from the first distance to the second clamping element , By such a configuration, at least three, preferably more than three clamping elements are provided on the safety bridge, which are arranged at irregular intervals from each other. By such an irregular spacing of the clamping elements clamping tasks can be achieved on certain workpiece dimensions in a qualitatively better way. This embodiment is preceded by the knowledge of the inventors that an ideal clamping of a workpiece should be performed such that the workpiece should be clamped by at least two clamping elements, preferably more than two clamping elements and no clamping surface of the clamping elements should extend beyond a workpiece edge , as this could damage the edge of the workpiece. By providing at least three, preferably more clamping elements at irregular distances from one another, it is possible in the panel dividing saw according to the invention to associate such a clamping element with a workpiece for performing a cut, which can realize this ideal clamping. It should be understood that the workpiece is not necessarily always applied to one and the same stop rail, but also in the central region of the kerf can be placed in a defined position to two or more clamping elements for its To use tension, which are arranged in this central area in the required for the individual workpiece distance to each other.

Still further, it is preferred that the group of clamping elements comprises a first group of clamping elements, which are each arranged at a first distance from each other, and a second clamping element or a group of second clamping elements, in a second, of the first different distance to the group of first clamping elements is arranged. Such an arrangement and grouping of clamping elements, a further advantageous ideal clamping of workpieces of different dimensions can be achieved by this two or more clamping elements are selected, which can clamp the workpiece, without causing damage to the workpiece in the edge region. According to a further preferred embodiment of the above-described Plattenaufteilsäge or inventively trained Plattenaufteilsäge according to the above description, the panel sizing a Sichereinheitsbrücke, which is arranged in the region of the Sägeschlitzes above the workpiece support surface and at least one clamping element for clamping a workpiece between a vertically movable clamping surface of the clamping element and has the workpiece support surface, and is characterized according to the invention in that on the safety bridge a plurality of first fins and laterally opposite to the side of the safety bridge, a plurality of second fins are arranged, arranged at least one clamping element between the first and second fins and the lamellae are vertically movable independently of each other and all fins are mechanically coupled to an actuator for synchronous n vertical movement of the slats. With this training, an advantageous and inventive embodiment of a shielding device is proposed on a panel sizing. This shielding device is formed by a plurality of fins, which extend laterally from the clamping elements or laterally above the saw slot on both sides. On the one hand, these lamellae seal the area in which the formation of the tension takes place and consequently prevent the sawdust from escaping from this area, respectively, and facilitate and facilitate the extraction of sawdust from this area. Furthermore, these slats cause a safety shield and prevent the risk of injury reaching a user in the area of the kerf or the clamping elements. The lamellae are distinguished by the fact that on the one hand they are coupled with an actuator in such a way that a synchronous actuation of the lamellae takes place. In addition to this synchronous operation possibility, the slats are vertically movable independently of each other and can passively move relative to each other. This specific synchronous as well as individual vertical mobility of the slats allows on the one hand to raise and lower the curtain formed by the slats in a quicker and structurally simple manner. In addition, it is possible that the lamellae adjust to individual heights in a lowering, for example. Such a way that some fins, which are lowered next to a workpiece, lower down to the workpiece support surface, but other lamellae, which lowered in the area above a workpiece be lowered down to the surface of this workpiece, therefore, therefore, by a smaller amount than the above-explained slats. This combined vertical movement of the slats is thus achieved in such a way that the synchronous lowering movement extends over a distance which extends the distance from the raised position to a position of the slats lying on the workpiece support surface. However, this entire, synchronous lowering movement is not completely carried out by those slats that come to rest on the workpiece, but these remain by relative movement relative to the other slats in a position above the workpiece support surface resting on the workpiece.

It is particularly preferred if the group of first and second slats can be raised by means of an actuator to a first, raised position and can be lowered from this first position to a second, lowered position in which a lower edge of the slats with the workpiece support surface or a workpiece resting thereon is in contact, and that the second position is achieved by all the slats are lowered from the first position together in a lowering direction and each slat is individually movable relative to the slats adjacent thereto in the lowering direction. With this training form ensures that the danger zone above the kerf can be covered on both sides by the slats and this cover is achieved even if above the kerf one or more workpieces are arranged, leaving between them free spaces where the slats on the Height of the workpiece support surface must be lowered. It is even further preferred that each lamella is positively connected to the lamellae adjacent to it in such a way that pivoting of the lamellae about their vertical axis is prevented and movement of the lamella in the direction of the vertical axis relative to the lamellae adjacent to it is made possible. On the one hand, this form of training achieves a robust construction of the lamellar curtain, which provides a load-bearing guidance of the lamellas for their individual mobility, and on the other hand avoids the need for additional guide elements or elaborate form-fitting guides of the lamellae to ensure reliable shielding of the danger zone. The positive connection between the slats can be achieved for example by means of a tongue and groove joint by a groove on a side edge of a blade is arranged, in which a spring engages, which is formed at a side edge adjacent thereto adjacent a lamella.

In accordance with yet another preferred embodiment, it is provided that the group of first and second lamellae can be raised by means of an actuator to a first, raised position and lowered from this first position into a second, lowered position, in which a lower edge of the Is the blade with the workpiece support surface or a workpiece resting thereon in contact, and that the actuator is coupled to a control device which has an interface for receiving a height of a workpiece signal indicating signal and is adapted to raise the slats to a position which um a distance above the upper workpiece surface is less than 1 cm, preferably 0.5 cm. This embodiment enables a particularly rapid implementation of successive saw cuts on workpieces on the inventive panel dividing saw. This is accomplished by raising the slats a minimum amount after a saw cut has been made so as to be able to translate a workpiece in a horizontal direction perpendicular to the kerf without causing the slats to displace and accurately position the workpiece for a subsequent saw cut hinder. Once the workpiece has been positioned, the lamellae are lowered onto the workpiece and the workpiece support surface. During the shifting process, the minimal contact between the blades and the workpiece is achieved, but at the same time the accidental penetration between the blades and the workpiece is prevented, thus further maintaining occupational safety. Alternatively, or in addition to this training, the lower edges, which serve as a support surface on the workpiece or the workpiece support surface for the slats, bevelled, chamfered, rounded, on the one hand to enable a sliding movement of workpieces, even on it resting slats, on the other hand allow the injury-free withdrawal of limbs from the area below the slat curtain even with lowered slats.

According to yet another inventive development of the above-described panel sizing or the above-described inventive developments of this panel sizing is provided, the panel sizing, which a safety bridge, which is arranged in the region of the Sägeschlitzes above the workpiece support surface, the fact that an operating unit on the safety bridge along the Direction of the kerf is movable by means of a panel actuator and preferably comprises a user interface and a panel control unit is adapted to control the panel actuator to be moved along the security bridge, preferably such that it follows a determined user position. This embodiment of the panel sizing saw is particularly suitable for panel sizing for large-sized workpieces and allows an operator in this case a fast and safe operation of the saw from different points of view. According to the inventors, such large panel sizing saws have proven to be problematic in that operation is often possible only at one operator position, thereby preventing the operator from performing a rapid work sequence on the machine when handling the panel sizing saw over its entire circumference Performing cuts on several workpieces wants to use. This is overcome according to the invention by the operating unit is tracked to the user and is provided at its respective operator position. This movement of the operating unit, also called a panel, can take place, for example, by linear displacement along the safety bridge, alternatively also by pivoting the operating unit along a pivoting arm or combined movement forms. In the case of panel sizing saws which, in addition to the operation from different positions on the front side, also permit operation from the front and rear side, provision can furthermore be made for the panel to be moved backwards on the machine, in particular rotated or pivoted, and more preferably also moved along the back, in particular to be moved. In this case, it is further preferably provided that the panel control unit is designed to generate at least two perspective views of the workpiece support surface and a workpiece placed thereon from different directions and, depending on a user position received via a position interface, one of the at least two perspective views to one in the operation unit to output complete optical display device. This further development form addresses the specific problem that an operator can be facilitated the use and operation of a panel sizing saw by graphically displaying the workpieces on the workpiece support surface, but this display can lead to misunderstandings and operating errors depending on the operator's perspective. This is overcome according to the invention by displaying the perspective view presented to the user, which, for example, indicates to him the position and orientation for the support of a workpiece, in a view matching his own standing position. In this case, a selection of two alternative perspective views can be presented in a simplified manner, for example, a view from the left and a view from the right. In a particularly preferred manner, however, a virtual perspective view is generated and output depending on the respective operator position, which exactly reflects a consideration of the panel sizing saw and the workpieces resting thereon from the actual operator position.

It is even further preferred that the position interface is signal-technically coupled to a graphical detection unit and the panel control unit is designed to determine a position of a user from a signal received by the graphical detection unit and to move the operation unit into the area of the determined user position, and / or to generate and transmit a perspective view from the determined user position to the visual display device. With this further development form, an automatic detection of the operator position is achieved by a graphical detection unit, for example one or two digital cameras, which are coupled to a corresponding image evaluation unit in order to detect the operator position. Thus, the operator position can be determined automatically and then the operating unit can track the operator and / or a corresponding perspective view, adapted to the actual actual position of the operator, can be output on the graphic output unit. The panel sizing saw according to the invention may preferably be operated according to a method for controlling a panel sizing saw, comprising the steps of: Clamping a workpiece by means of a safety bridge, which is arranged above a workpiece support surface by vertically moving at least one clamping surface relative to the workpiece support surface, method of a arranged below a workpiece support surface saw unit with a circular saw blade which rotates on the saw unit below the workpiece support surface and in a sawing protrudes through the kerf, along a kerf, characterized in that by means of a signal light device, which preferably extends along the kerf and preferably a plurality of mutually independent, spaced apart in the direction of the kerf signal lighting means, one or more of the following process steps are signaled: Upcoming activation a clamping surface, activated activation of a clamping surface, positioning range of a workpiece, position of the saw unit or saw Latts, function of the saw blade as rotating, stationary, raised or lowered.

Furthermore, the panel sizing saw according to the invention can be operated according to a method of controlling a panel sizing saw, comprising the steps of: clamping a workpiece by means of a safety bridge arranged above a workpiece support surface by vertically moving at least one clamping surface relative to the workpiece support surface, a method below a workpiece support surface arranged sawing unit with a circular saw blade which rotates on the saw unit below the workpiece support surface and protrudes in a sawing through the Sägeschlitz along a Sägeschlitzes, characterized in that arranged on the safety bridge a plurality of clamping surfaces at irregular intervals along the Sägeschlitzes and are individually controlled, one or more workpieces that rest on the workpiece support surface in the area above the kerf by means of one or a group are stretched by clamping elements of the plurality of clamping surfaces, wherein preferably each clamping surface is formed by a U-shaped clamping element, at the leg ends two clamping surface sections are formed and the saw blade during cutting passes through a cavity between these two clamping surface sections.

Finally, the panel sizing saw according to the invention can be operated according to a method of controlling a panel sizing saw, comprising the steps of: clamping a workpiece by means of a safety bridge arranged above a workpiece support surface by vertically moving at least one clamping surface relative to the workpiece support surface; a workpiece pallet gefläche arranged sawing unit with a circular saw blade which rotates on the saw unit below the workpiece support surface and projects in a sawing through the Sägeschlitz along a Sägeschlitzes, characterized in that on the safety bridge a plurality of lamellae is arranged in the direction of the kerf adjacent form a lamellar curtain on both sides of the clamping surfaces, the lamellae are moved synchronously by means of an actuator from a raised position to a lowered position, and a first lamella moves vertically relative to a second lamella adjacent to it when the first lamella comes to rest on a workpiece and the second lamella comes to rest on the workpiece support surface, wherein preferably the lamellae are guided against each other in a form-fitting manner such that prevents a relative pivoting of the lamellae about their vertical axis and a relative loading Movement of the slats along its vertical axis is made possible. Concerning. the further developments, variants and advantages of these method steps is made to the corresponding thereto, previously described embodiments, variants and advantages of the invention Plattenaufteilsäge reference.

A preferred embodiment of the invention will be described with reference to the accompanying figures. Show it:

Fig. 1 is a frontal, centrally broken view of a first embodiment of a

 Safety bridge for a panel sizing saw according to the invention,

2 is a side view of the embodiment of FIG. 1 along the line H-H in FIG. 1, FIG.

3 shows a detail according to the detail I in FIG. 2

4 is a plan view of the embodiment of FIG. 1 with removed cover hood,

Fig. 5 detail G of FIG. 4 Fig. 6 is a front view of the embodiment of FIG. 1 with omitted

cover, 7 is a bottom view of the Ausführungsfornn of FIG. 1 with omitted cover,

Fig. 8 is a perspective detail view of an alternative embodiment of a

Abschirmvo ^'rrichtung,

9 is a detail view according to the portion J of Fig. 8,

10 shows a second embodiment of a safety bridge for a panel sizing saw according to the invention in a representation of two different lifting situations,

1 1 shows a detail according to FIG. 7 of the first embodiment,

12 is a left side view of the embodiment of FIG. 1 with the cover omitted,

13 is a sectional view taken along line B-B in FIG. 6 of the embodiment according to FIG. 1, FIG.

14 is a detail view according to the section E in Fig. 13, and

15 is a sectional view taken along the line C-C in Fig. 6 side view of the embodiment of FIG. 1,

16 is a detail view according to the portion D in Fig. 15,

Fig. 17 is a schematic view of the air duct in the safety bridge according to an alternative embodiment.

1 shows a frontal overall view of a safety bridge 1 for a panel sizing saw according to the invention. The safety bridge 1 is mounted by means of front-side supports 2, 3 above a workpiece support surface 4 by means of a respective Vierfachverschraubung. Below the workpiece support surface 4, a saw unit 5 is mounted linearly displaceable in a direction 5c. On the saw unit 5, a main saw blade 5a and a scoring saw blade 5b are rotatably supported, and the main saw blade 5a and the scoring saw blade 5b can be translationally displaced in the vertical direction to form a peripheral portion of these two saw blades over the work support surface 4 for cutting a work piece. which rests on the workpiece support surface 4 to perform. For this purpose, the saw unit 5 is displaced translationally along the direction 5c when the saw blades rotate and project beyond the workpiece support surface 4.

The saw blades 5a, b protrude through a saw slot in the workpiece support surface 4. The saw slot extends in the direction of the linear feed movement 5c of the saw unit 5. The safety bridge 1 comprises two linear drives 10, shown in more detail in FIG. 2 and FIGS. 12 and 13, which are designed as servomotors. A first linear drive 10a is fixedly connected to the front-side support 2, a second linear drive 10b is fixedly connected to the other end-side support 3. The servomotors 10a, b serve to displace a recess 300, which receives the peripheral portion of the circular saw blades 5a and 5b projecting beyond the workpiece support surface when a cut is made, in the horizontal direction and transversely to the direction of movement 5c. The servomotors 10a, b are synchronized for this purpose. The closer functioning of the adjustment provided by the servomotors 10a, b is explained with reference to FIG. 12 for the left-hand configuration in FIG. 1 and is executed in a constructively matching manner on the right-hand side in FIG.

The servomotor 10a is flanged to a gear 20a, which underpins the rotational movement of the servomotor 10a and transmits it to an adjusting spindle 30a. The adjusting spindle 30a cooperates with a spindle nut 40a, which is fixedly mounted on a guide carriage 50a. The guide carriage 50a is slidably mounted on a linear guide 60 by means of sliding shoes 55. By means of this displaceable, actuator-actuated bearing of the guide carriage 50a via the servomotor 10a, it is possible to displace the recess 300, which is connected to the carriage 50a, in a horizontal direction perpendicular to the direction of movement 5c of the saw carriage. Referring again to Fig. 1, a cover 51 is mounted on the carriage 50a, which protects the structural components from environmental influences and prevents accidental reaching into the user of the moving parts of the safety bridge. This cover 51 is omitted in all other figures except Figs. 1 and 2 for a better understanding of the invention.

The guide carriages 50a, b are connected to frontal vertical struts 52, 53, which are displaceable horizontally and perpendicular to the direction of movement 5c together with the carriages 50a, b. On these vertical struts on the one hand, an upper support profile 180 is fixed, which extends in the direction of the kerf from the vertical strut 52a to the vertical strut 52b.

As can be seen in more detail in FIGS. 13 and 14, this upper carrier profile 180 receives guide elements 100 in which a plurality of vertically extending cylinder rods 101 are mounted so as to be vertically displaceable by means of slide bushings 102. At the lower end of these cylinder rods 101, a support profile 140 is fixed for a slatted curtain. This carrier profile 140 can be displaced vertically together with the cylinder rods 101, whereby a Lamellienvorhang, which is formed by a plurality of fins 150, can be raised or lowered.

The carrier profile 140 is designed as a U-profile, the interior facing downwards in the direction of the kerf. On the two legs of this carrier profile 140 for the slatted curtain, the slats 150 are attached on both sides. The louvers 150 are arranged in a horizontal direction next to each other along the kerf and serve to shield the kerf and the saw blades extending therein to prevent the escape of chips and the accidental reaching of a user into this danger zone. All fins 150 can be raised or lowered together by raising or lowering the carrier profile 140. For this lifting or lowering a cable pulling device is provided, which can be seen in greater detail in FIG.

The recognizable in Fig. 6 cable pulling device for the slatted curtain comprises a pneumatic cylinder 120 which operates via a cable jack 121 four cables 1 10a-d. The first cable 1 10a extends from the pneumatic cylinder 120 over the entire length of the upper longitudinal member 180 and is connected to the pneumatic cylinder 120 gege Overlying end of this upper longitudinal member 180 is deflected by means of a mounted on the side rail 105 guide roller 90a and connected to the U-shaped support section for the slatted curtain. The other cable 1 10b extends from the pneumatic cylinder 120 only over a short distance along the upper carrier profile 180, is then deflected by means of a mounted on the upper support profile 180 guide roller 90b and also connected to the U-shaped support section for the slatted curtain. The cables 1 10c, d are analogous to this on the other side of the carrier profile 180. By actuation of the pneumatic cylinder 120, thereby the U-shaped support section 140 of the slatted curtain and together with this all slats 150 are raised and lowered.

Each louver 150 is fastened to the U-shaped carrier profile 140 for the lamellar curtain by means of two guide pins 150a, b which can be seen in greater detail in FIG. The guide pins 150a, b are arranged vertically one above the other. Each louver 150 has a longitudinal groove 151 running in the vertical direction, in which the two guide pins 150a, b extend. On the outside, each guide pin 150a, b has a head which fixes the louver 150 to the U-shaped support profile 140. The longitudinal groove 151 extends over a length which is greater than the distance between the two guide pins 150a, b. This makes it possible for each blade 150 to be individually raised from a lowered position in which the guide pins 150a, b are disposed at the upper end of this longitudinal groove 151 by a certain amount. This individual vertical displaceability of the blades 150 ensures that the area above the kerf is reliably sealed even when one or more workpieces protrude from the side into the area above the kerf and consequently the lower edges of the blades 150 facing the workpiece bearing surface for complete coverage and securing the danger area must be at different heights, namely on the one hand on the upper surface of the workpiece, on the other hand on the workpiece support surface. 4

The pointing to the workpiece support surfaces ends of the slats are chamfered, rounded or chamfered, on the one hand to allow easy movement of the workpieces with lowered slat curtain 150 and on the other hand to allow injury-free extraction of limbs, when the slats rest on such limb dimensions. The individual displacement of the slats prevents in one such a case that the lamellar curtain causes injury to limbs.

In Figures 8 and 9, an alternative embodiment of the slatted curtain is shown. This alternative embodiment is characterized in that the slatted curtain can additionally fulfill the function of a compressed air supply in the space above the kerf.

The slats 550 shown in FIGS. 8 and 9 are, like the slats 150 described above, arranged side by side in the longitudinal direction of the saw slit or the U-shaped carrier profile for the slatted curtain. At the respective juxtaposed edges of the slats, a tongue and groove connection 555 is formed, which connects the slats form-fitting manner with each other and thus connects to a self-contained wall to each other. At the same time, this tongue-and-groove connection effects a guidance of two adjacent lamellas relative to one another and allows the individual vertical displacement of each lamella 550 relative to its adjacent louvers 550.

In the interior of each blade is formed from the upper end downwardly extending blind hole 551. This blind hole 551 extends to just before the lower end side of the blade. A horizontal and inwardly to the saw slot facing hole 552 is connected to the blind hole 551 at the lower end.

In the blind holes 551, a guide tube 553 is guided. The guide tube 553 is connected at its upper end with a bar 554 which is fixed to the U-shaped upper beam profile 140 for the slatted curtain. In this bar a compressed air distribution line is arranged, which distributes compressed air to each of the plurality of tubes 553. The tubes 553 forward this compressed air in the blind hole 551, from which the compressed air in turn can escape through the horizontal bore 552 inwardly towards the Sägeschlitzes. The compressed air then causes after its exit a transport of chips in the area around the kerf and thus improves the suction effect. The tubes 553 can be acted upon at the same time with compressed air, alternatively, the compressed air can be supplied only to individual selected tubes 553 or groups of tubes 553 by appropriate valves in the compressed air supply. This selective compressed air supply is coupled to a control device such control technology that, for example, only such slats Compressed air are applied, which are arranged in front of and behind the current position of the saw blade, thereby further improving the suction effect.

The upper carrier profile 180 further receives a plurality of pneumatic cylinders 160, which serve as a clamping cylinder for clamping a workpiece. The pneumatic cylinders 160 are arranged at irregular intervals next to each other along the upper carrier profile 180. They form, starting from the right end in Figures 1 and 6 and 7 first a double group 160a, b, then a triple group 160c, d, e, followed by a single cylinder 160f, a triple group 160g-i, a single cylinder 160j, a double group 160k, I and another double group 160m, n.

The pneumatic cylinders 160a-n are disposed within the upper beam profile 180 and the cylinder rod of the pneumatic cylinders 160a-n extends downwardly from this upper beam profile. In each case laterally of this cylinder rod 161, two guide rods 162, 163 are formed, by means of which the retraction and extension movement of the pneumatic cylinder 160a-n additionally guided and the cylinder rod 161 is protected from bending forces.

The cylinder rod 161 and the two guide rods 162, 163 are coupled by means of an adapter plate 164 with a U-shaped clamping runner 170a-n at its lower end. The U-shaped clamping runner comprises an upper crosspiece 171 and two lateral legs 172, 173 extending downwardly in the direction of the workpiece support surface 4 from this crosspiece 171. The U-shaped clamping runners 170a-n are arranged within the space formed by the double-sided slatted blinds and form a recess 300 between them.

The lower ends 172a, 173a of the lateral legs 172, 173 of each clamping runner form clamping surfaces, which serve to clamp a workpiece onto the workpiece support surface 4. For this clamping operation, the pneumatic cylinder 160a-n is extended, and pressurized until a sufficient clamping force is achieved.

In the interior space between the two lateral profiles 172, 173, a lower carrier profile 190 is arranged above the recess 300, which extends from the front side fasteners 2, 3 and serves to stiffen the entire safety bridge. Each clamping runner 170a-n can be lowered or raised individually by the respectively associated pneumatic cylinder 160a-n. For this purpose, the pneumatic cylinders 160a-n can be controlled by a control unit, which is signal-technically coupled to a graphical user interface. Using this graphic user interface, each pneumatic cylinder can be individually controlled by the user in order to carry out a clamping process by means of this pneumatic cylinder.

In addition to this manual selection of the individual pneumatic cylinders 160a-n, automatic tensioning operations with a correspondingly automatic selection of selected pneumatic cylinders are also programmed in the control unit for the clamping process. This automatic selection is based, on the one hand, on a multiplicity of sensors which are arranged along the lower carrier profile and can detect the presence of a workpiece in the region of each clamping runner. Depending on the signal from this plurality of sensors, the control unit may then selectively drive those pneumatic cylinders 160a-n which actuate a chock in whose area a workpiece has been detected. Furthermore, the control unit is provided with an interface via which a machining sequence program can be loaded. In this machining sequence program, starting from an initial size of a workpiece, several processing steps for a blank are stored. From these data, the respective size of the workpiece is stored before and after each cutting process and also the position at which the workpiece is positioned for the implementation of the next saw cut and is stretched. From this workflow program can then also be carried out in an automated manner, the clamping process via individually selected clamping runners.

The lateral legs 172, 173 are only spaced apart from each other so as to define a recess 300 of a width therebetween sufficient to allow the circular saw blade to have a miter angle of slightly more than 45 ° and a depth of cut equal to the maximum depth of cut of the Panel saw corresponds to pick up. This thus achieved minimum width of the recess 300 leads to an effective extraction of chips from the recess 300, since compared to the prior art, the recess is not provided in such a width, which for receiving the circular saw blade in a two-sided pivoting of slightly more than 45 ° would be necessary. The recess 300 can be laterally transversely to the direction of extension of the kerf by translational displacement of the upper and lower beam profile with the attached components of the slatted curtain and the clamping runners be moved horizontally, thereby to be brought into a position which allows the inclusion of the saw blade.

The extraction of chips from the region of the recess 300 via a controlled local suction effect. For this purpose, a negative pressure is generated on the one hand in a cavity 55 produced by the cover 51. This negative pressure may optionally be applied to a plurality of suction slots arranged longitudinally along the upper beam profile 180. The selective loading of these longitudinal slots on the upper support profile 180 is controlled by two pneumatic cylinders 70a, 70b, which are each mechanically coupled to a slide 80a, 80b for the suction air duct. By displacing this slide 80a or 80b by means of these pneumatic cylinders 70a, 70b, one or more suction slots can optionally be opened or closed in order to achieve a local suction effect on the recess 300. The actuation of the pneumatic cylinders 70a, 70b is effected by a control unit, which is in particular signal-coupled with a sensor which detects and transmits the position of the saw blade along the kerf. In this way, by selective control of the pneumatic cylinder 70a, 70b each such suction slots are opened, which lie directly in the area above the respective position of the saw blade and consequently a targeted suction effect can be achieved.

Laterally of the lower beam profile 190 extends a light signal strip 210, which extends over the entire length of the kerf. In the light signal bar, a plurality of LEDs are arranged side by side, which can be activated individually. Here are alternately LEDs with any number of different colors, z. B. red, green, blue in the light bar 210. The light bar 210 is attached to the cover 51. The LEDs of the light bar 210 serve for various functions. On the one hand, a direct and effective illumination of the working area is achieved by this light bar, thereby facilitating the positioning and assessment of the workpieces to the user. For this purpose, a white light is summarily achieved by driving all the LEDs and causes a good illumination of the area above the sawing slit. The light strip 210 is further connected to a control unit, which can also individually control the LEDs for signaling work processes and workflows. In a first function, the user can be shown the area in which a workpiece is to be placed above the kerf by activating individual LEDs. This can be done, for example, by illuminating the respective end-side LEDs of the intended workpiece support area or by lighting all the LEDs, which are above the area in which the workpiece is to be placed. This function of the position display can be done in particular by controlling the green LEDs, thereby achieving not only the position effect but also a function signaling.

The LEDs may be used in a third functionality to indicate to the user in which areas a clamping operation of the workpieces is or will occur. For this purpose, for example, the blue LEDs in the respective areas around a Spannkufe, which is activated or should be activated, light up. In this case, it is further possible to differentiate between an upcoming and an executed clamping operation by correspondingly different colors, for example by activating the green LEDs in addition to the blue LEDs when the clamping operation indicated by the blue LEDs is actually executed and the workpiece is tensioned is.

In a further, fourth functionality, the light bar can be used to display the position of the saw unit, in particular the position of the main saw blade and / or the scoring saw blade to the user. For the purpose of signaling the danger, in particular the red LEDs in the respective area in which the saw blade (s) are located can be activated for this functionality. In this case, in the process of the saw blade by follow-up activation of the LEDs, a running light can be generated in order to thereby effectively indicate to the user the active sawing process. It should be understood that the position of the saw blade or the saw blades is displayed in particular only when the saw blades protrude beyond the workpiece support surface, thereby achieving an actual hazard warning.

10 shows a second embodiment of the safety bridge according to the invention. This second embodiment is characterized in that the entire structural unit made of lower carrier profile and the structural elements attached thereto can be displaced vertically on the workpiece supporting surface by a substantially greater distance. is gert. In Fig. 10 a lowered position is shown, in which the slats of the slat shield 150a 150a rest on the workpiece support surface. In this lowest position in particular plate materials can be processed and sawn. In Fig. 10, a second position of the slatted curtain 1 150 b is schematically shown, which represents a maximum position for this purpose. It is to be understood that the louver curtain 1 150a and 1150b basically represents the same component and only one of these two positions can occupy each. In Fig. 10 to illustrate the additional function of this slat curtain in two different positions 1 150a and 1 150b is shown.

In order to achieve the vertical displaceability by the amount a, in the embodiment according to FIG. 10, a spindle drive 1001, 1002 is mounted at each end, which serves to lift side profiles 1052a, 1052b vertically by a maximum of the amount a from the position in which the slats of the slat protection curtain rest on the workpiece support surface.

In addition to the stroke a thus provided, the slats can themselves be lifted by the stroke b and thus allow a workpiece, in particular a hollow body, to be clamped between the slats or clamping runners and the workpiece support surface, which assumes a maximum height of a + b and such a workpiece is then sawn by means of the panel sizing saw.

FIG. 17 shows an alternative embodiment of the lower carrier profile, which is particularly suitable for an embodiment of the safety bridge according to the invention which, in addition to an extraction of chips, also provides a compressed air supply by means of the specific embodiment of the lamellae curtain shown in FIGS. 8 and 9. As can be seen, in this embodiment, shown in FIG. 17, a suction chamber 2001 is provided in the lower support profile on the one hand, which is connected to a vacuum air source and is designed to extract chips via individually individually opened suction slits.

Above this suction chamber 2001, a supply air chamber 2002 is provided, which is connected to a positive pressure air source. In the supply air chamber there is an overpressure relative to the environment. The compressed air located in the supply air chamber 2002 can via horizontal inlet channels, which are formed in a fastening strip 2554 in a Variety of compressed air line tubes 2553 which extend perpendicularly from the .Befestleisten 2554 in the direction of the workpiece support surface. From these compressed air line pipes 2553, the compressed air can in turn enter a blind hole in each case a blade 2550 and leave this at the lower end, adjacent to the workpiece support surface by a horizontal bore 2552 inwards.

By this type of compressed air guide, an air flow in the region of the recess 2300 is effected, which achieves effective extraction of chips. On the safety bridge a control panel is further arranged, which is linear veschieblich along the safety bridge on a linear guide by means of a panel actuator. The control panel has a touch-sensitive screen and also separately arranged manual control units, such as an emergency stop button.

By means of digital cameras arranged at the respective ends of the safety bridge, the position of an operator is determined by an image evaluation unit and transmitted to a panel control unit. The panel control unit controls the panel actuator in such a manner that the control panel is moved to an optimum position for the user, in which it can easily operate and view the control panel. At the same time, a virtual perspective view of the workpiece support surface is generated from the perspective of the user position of the panel control unit, which includes the resting on the workpiece support surface workpieces in their desired position. This perspective view is displayed on the screen of the control panel.

Claims

claims Panel Saw, Turning:  A workpiece support surface,  a saw unit, which is preferably arranged below the saw slot and movably mounted along the saw slot, with a circular saw blade, which is preferably rotatably mounted on the saw unit below the workpiece support surface and projects through the saw slot in a sawing position, characterized by a signal control unit and a signaling device with this control unit coupled lighting device, which is arranged on a stop or in the region of or above the workpiece support surface, and characterized in that the signal control unit for controlling the lighting device is formed in such a manner that the lighting device is activated in response to the implementation of a running on the panel sizing process step. Panel sizing saw according to claim 1, characterized in that the lighting device comprises at least two differently colored lighting means, which are signal technically coupled to the signal control unit so that they are individually activated. Panel sizing saw according to claim 1 or 2, characterized in that the lighting device extends along the Sägeschlitzes and comprises a plurality of lighting means, which are spaced apart in the direction of the longitudinal extent of the Sägeschlitzes and signal-technically coupled to the signal control unit so that they are individually activated. Panel sizing saw according to one of the preceding claims, characterized in that the signal control unit has an input interface for inputting a Sägeagg- regatpositionssignals characterizing the saw unit position and is designed to control the lighting device in response to this Sägeaggregatpositionssignals. Panel sizing saw according to the preceding claims 3 and 4, characterized in that the signal control unit is designed to activate in each case only those lamps or group of lamps which are arranged in the region of the saw unit position. Panel sizing saw according to the preceding claim 4 or 5, characterized in that the input interface  with a sensor for detecting the saw unit position or with a memory device for storing a sequence program of Panel signal technology is coupled to enter the saw unit position. Panel sizing saw according to one of the preceding claims, characterized in that the signal control unit has an input interface for inputting a clamping element that characterizes the activation of a tensioning element and is designed to control the lighting device as a function of this tensioning element signal. Panel sizing saw according to the preceding claims 3 and 7, characterized by a plurality of clamping elements extending along the kerf, and further characterized in that the signal control unit is designed to activate in each case only such bulbs or groups of bulbs which are arranged in the region of a clamping element which is or will be activated. Panel sizing saw according to one of the preceding claims, characterized in that the signal control unit has an interface for inputting a sequence program which includes the abutment position of a workpiece in the region above the kerf and the signal control unit is designed to activate only such bulbs or group of bulbs from a plurality of bulbs of the light device which are arranged in the region of the abutment position, in particular which define the abutment position. Panel sizing saw according to one of the preceding claims, characterized in that the lighting device at least two mutually different functions from the selection: Signaling of saw blade position or sawing unit position,  Signaling the activation of the saw unit or the rotation of a main saw blade or a scoring saw blade,  Signaling the imminent or successful activation of a tension element,  Signaling the position of a workpiece,  that each signaling function is associated with a signaling color of at least two different signaling colors and the signal control unit is designed to activate a light source having the signaling color associated with this function as a function of the respective function to be signaled. Plate dividing saw according to one of the preceding claims,  characterized in that the lighting device is arranged on a pressure bar, which is arranged above the workpiece support surface and which has at least one clamping element for clamping a workpiece between a vertically movable clamping surface of the clamping element and the workpiece support surface. Sliding table saw according to claim 1 or the preamble of claim 1, characterized by a pressure bar, which is arranged in the region of the saw slot above the workpiece support surface and a plurality of longitudinally extending the Sägeschlitzes spaced apart and individually controllable clamping elements for clamping a workpiece between a vertically movable clamping surface of the respective clamping element and the workpiece support surface. Plate dividing saw according to claim 12,  characterized in that the group of clamping elements  a first and a second clamping element, which are arranged at a first distance from each other, and  a third clamping element, which is arranged in a second, different from the first distance to the second clamping element. 14. Piatteaufteilsäge according to claim 12, characterized in that the group of clamping elements a first group of clamping elements, which are each arranged at a first distance from each other, and  a second clamping element or a group of second clamping elements, which is arranged in a second, different from the first distance to the group of first clamping elements. Panel sizing saw according to claim 1 or the preamble of claim 1, with a pressure bar which is arranged in the region of the saw slot above the workpiece support surface and which has at least one clamping element for clamping a workpiece between a vertically movable clamping surface of the clamping element and the workpiece support surface,  characterized in that on the pressure bar on one side of a plurality of first fins and, for this purpose, laterally arranged on the pressure bar a plurality of second fins, the at least one tensioning element between the first and second fins is arranged and the fins independently movable vertically and all louvers are mechanically coupled to an actuator for synchronous vertical movement of the louvers. 16. Panel Saw according to claim 15,  characterized in that the group of first and second louvers can be raised to a first raised position by means of an actuator and lowered from said first position to a second lowered position in which a lower edge of the louvers engage or rest on the workpiece support surface lying on the workpiece is in contact, and that the second position is achieved by all the slats are lowered from the first position together in a lowering direction and each slat individually relative to the adjacent slats against the lowering direction is movable. 17. panel sizing saw according to one of the preceding claims 15 to 16,  characterized in that each lamella is positively connected to its adjacent lamellae so that prevents pivoting of the slats about its vertical axis and a movement of the lamella in the direction of the vertical axis is made possible relative to the lamellae adjacent thereto. Panel sizing saw according to one of the preceding claims 15 to 17, characterized in that the group of first and second louvers can be raised to a first raised position by means of an actuator and lowered from said first position to a second lowered position in which a lower edge of the louvers engage or rest on the workpiece support surface resting on the workpiece is in contact, and that the actuator is coupled to a control device which has an interface ztim receiving a height of a workpiece signal indicative signal and is designed to raise the slats to a position which is a distance above the upper Workpiece surface is less than 1 cm, preferably 0.5 cm. Panel sizing saw according to claim 1 or the preamble of claim 1, with a Druckbaiken, which is arranged in the region of the Sägeschlitzes above the workpiece support surface  characterized in that an operation unit is movable on the pressure beam along the direction of the kerf by means of a panel actuator and preferably comprises a user interface and a panel control unit is arranged to drive the panel actuator to move along the pressure beam, preferably such that it is one determined user position follows. Panel sizing saw according to claim 19,  characterized in that the panel control unit is adapted to generate at least two perspective views of the workpiece support surface and a workpiece placed thereon from different directions and, depending on a user position received via a position interface, one of the at least two perspective views to an optical display device included in the operation unit issue. 21. Panel Saw according to claim 20,  characterized in that the position interface is signal-technically coupled to a graphical detection unit and the panel control unit is designed to determine a position of a user from a signal received by the graphical detection unit and move the operating unit into the area of the determined user position, and / or to generate a perspective view of the determined user position and to transmit to the optical display device. Method of controlling a panel sizing saw, comprising the steps of:  Clamping a workpiece by means of a pressure bar, which is arranged above a workpiece support surface by vertically moving at least one clamping surface relative to the workpiece support surface,  Method of a saw unit arranged below a workpiece support surface with a circular saw blade, which rotates on the saw unit below the workpiece support surface and projects through the saw slot in a sawing position, along a kerf, characterized in that one or more of the following method steps are signaled by means of a signal light device, which preferably extends along the kerf and preferably has a plurality of independent, in the direction of the kerf spaced signal illuminant,  Upcoming activation of a clamping surface,  activation of a clamping surface,  Positioning area of a workpiece  Position of the saw unit or saw blade  Function of the saw blade as rotating, stationary, raised or lowered. Method of controlling a panel sizing saw, comprising the steps of:  Clamping a workpiece by means of a pressure bar, which is arranged above a workpiece support surface by vertically moving at least one clamping surface relative to the workpiece support surface,  Method of a saw unit arranged below a workpiece support surface with a circular saw blade, which rotates on the saw unit below the workpiece support surface and projects through the saw slot in a sawing position, along a kerf, characterized in that on the pressure bar a plurality of clamping surfaces are arranged at irregular intervals along the Sägeschlitzes and are individually controllable, one or more workpieces that rest on the Werkstückaufiagefläche in the area above the Sägeschlitzes are stretched by means of one or a group of clamping elements of the plurality of clamping surfaces, preferably each clamping surface is formed by a U-shaped clamping element, at its leg ends two clamping surface sections are formed and the saw blade when cut through a cavity between these two clamping surface sections runs. Method of controlling a panel sizing saw, comprising the steps of:  Tensioning a workpiece by means of a pressure bar disposed above a workpiece support surface by vertically moving at least one clamping surface relative to the workpiece support surface;  Method of a saw unit arranged below a workpiece support surface with a circular saw blade, which rotates on the saw unit below the workpiece support surface and projects through the saw slot in a sawing position, along a kerf, characterized in that  on the pressure bar a plurality of lamellae is arranged, which are arranged side by side in the direction of the kerf and form a lamellar curtain on both sides of the clamping surfaces,  the slats are synchronously moved by means of an actuator from a raised position to a lowered position, and  a first blade moves vertically relative to a second blade adjacent thereto when the first blade comes to rest on a workpiece and the second blade comes to rest on the workpiece support surface, wherein preferably the slats ^{^} are each positively guided in such a that a relative pivoting of the blades to prevent its vertical axis, and a relative movement of the blades is made possible along its vertical axis.