RU2372270C2 - Unwinding device for reels of sheet material - Google Patents

Abstract

FIELD: mechanical engineering.

SUBSTANCE: installation contains couple of unwinding shafts for corresponding reels, located from side opposite to plane of symmetry (X), device for fusion of back end of reel, uncoiled from one of mentioned shafts, with front end of new, full reel, installed on other shaft, herewith device, in turn allows configuration, symmetric relative to plane of symmetry and contains couple of jointing cylinders (11, 12), located on each side of plane of symmetry (X), rotating around its corresponding axis and implemented with ability of approaching to each other and moving off from each other, groups of suction ports, formed on lines lengthwise generatrix of jointing cylinders (11, 12). According to invention the first cutter (13), interacting to corresponding cylinder and located with ability of pressure to this cylinder lengthwise its generatrix, is placed lower than contact area of this cylinder (11) to other cylinder (12), the second cutter (24) is located higher than specified cylinders, herewith installation is outfitted by controlling means of power transmitting means (26, 27), synchronising rotation of cylinders at a rate, at which specified material is uncoiled from reels.

EFFECT: invention provides for productivity improvement.

12 cl, 14 dwg

Description

Technical field

The present invention generally relates to equipment for unwinding rolls of sheet material, in particular paper, tissue paper, and the like. More specifically, the present invention relates to a dual unwinding apparatus provided with a device for splicing a rear end of a material wound from one roll into a front end of a material of another full roll.

BACKGROUND OF THE INVENTION

When unwinding rolls of flexible sheet material, such as paper, tissue paper (tissue), etc., it is necessary to replace empty rolls after unwinding with full ones. Since it is important to reduce downtime due to the roll change procedure, unwinding equipment has already been proposed to complete the installation of a new roll (at the same time as performing another basic operation) using the symmetrical configuration of the dual unwinding roll. In practice, this means that when one roll continues to be unwound on one shaft, the other shaft is idle and can be used to install a second roll. When the first roll is completely unwound, the second unwinding shaft starts to rotate, after which the empty roll can be replaced with a new full roll on the first shaft (which is now a backup). Subsequent roll replacements are carried out alternately on two shafts, so that there is always a ready-made full roll in stock.

Double equipment of the type described above is also used for splicing the rear end of the unwound roll web with the front end of the web on a new roll, so that equipment located downstream of the unwinding unit (for example, cutters, rewind devices, folding devices, etc. .), a continuous flow of material has been received, which increases the productivity of the process. In the case of paper, splicing is performed by superimposing two edges of the material, namely the trailing edge of the web of the unwound roll and the leading edge of the web on the new roll, and sealing the two superimposed edges by applying pressure in a direction normal to the plane in which the edges lie.

When splicing, the overlap between the two edges should not be too long, as this leads to a loss of material and can interfere with subsequent technological operations. On the other hand, the splicing strength is directly proportional to the longitudinal size of the overlap, so that the splicing length should not fall below a certain limit length.

When splicing, the tension of the rear end should be maintained, so that splicing should be done when there is still enough material left to roll. Thus, together with the splicing operation, it is necessary to separate (cut off) the spliced end of the almost empty roll from the rest of the web on the roll due to crosswise cutting of the web. The edge of the cut should be smooth and clean, not only for aesthetic reasons, but also for functional reasons, since an uneven edge can cause problems in the subsequent stages of processing and in the corresponding machines. For the same reasons, the edge of the leading edge of the new roll should be flat and clean, which is also ensured by cross-cutting, before the actual process of splicing.

For obvious reasons, the splicing procedure should be possibly faster, so as to create a minimum of easy-to-feed material to be unwound. The splicing device should be simple and structurally compact so that it does not interfere with other parts of the equipment or material when it is unwound.

It should be borne in mind that the known equipment does not fully meet the requirements described above.

SUMMARY OF THE INVENTION

The main objective of the present invention is the creation of a dual installation for unwinding the type described above, which allows for accurate splicing with precisely controlled length at maximum speed, using a structurally and functionally simple splicing device.

A known installation for unwinding rolls of sheet material US 5975457 A, containing a pair of unwinding rolls for the respective rolls lying on each side of the plane of symmetry of the installation, in the appropriate equipment, and a device for splicing the rear end of the roll, wound from one of these shafts, with the front end a new roll mounted on another shaft, the splicing device has a symmetrical configuration relative to the specified plane of symmetry and contains a pair of splicing cylinders located on opposite sides of said plane of symmetry, revolving around their respective axes and adapted to rendezvous with each other and remote from each other, whereby the position of convergence of the cylinders coincides with the condition of mutual contact with some degree of pressure in said plane of symmetry; drive means designed to provide rotation and displacement of said cylinders of a group of suction holes formed along the corresponding generatrices of said cylinders, designed to hold the material on the cylinders and deviate it from the specified plane of symmetry; the first cutting means for cutting across the material held on the cylinder, and the second cutting means for transversely cutting the material.

The proposed installation differs from the aforementioned in that the first cutting means interacting with the said cylinder and arranged to be pressed against this cylinder along its generatrix is placed below the contact area of this cylinder with another cylinder, the second cutting means is located above these cylinders, control means of the drive, synchronizing the rotation of the cylinders with the speed at which the specified material is unwound from the rolls.

The plane of symmetry of the installation (X) is vertical and separates the unwinding shafts and the splicing cylinders of the splicing device, which have horizontal axes, and means for deflecting the material are provided to feed it into the splicing device from above along the plane of symmetry, and then deflect it horizontally downstream devices under one of the unwinding shafts.

The installation has a deflection roller for deflecting the material released by the cylinder, located below the specified cutting means with the distance from the plane of symmetry (X).

Under the first cutting means and the deflecting roller is a means of collecting material cut off by this means, which is removable.

The second cutting tool located above the cylinder is designed to cut the material when interacting with the opposite shaft. It is located between two rollers of the deflection means, one of which is the main one, and the other is auxiliary and is located above with a large distance from the plane of symmetry (X).

Each of the cutting means contains a cutting disk, which is mounted with sliding on a guide running along the corresponding cutting line of the material.

Suction openings communicate with internal axial channels that are open at least on one axial end of the corresponding cylinder, for communication with suction means located externally, the opening of said channel being closed by means of distribution means for synchronizing the suction force in order to control the holding / releasing of material by the cylinder .

The distribution means comprises at least one flange located on the outer surface of the cylinder shoulder and a distribution passage formed in the indicated flange along the arc of the annular path of the axial channels, the passage communicating with the outer side of the flange through the suction inlet of the suction means.

In the plane of symmetry (X), a separation screen may be installed separating the two symmetrical parts of the splicing device above the splicing cylinders.

The working surfaces of the splicing cylinders are advantageously grooved so that longitudinal protrusions are formed in order to reduce the area of the contact surface when the cylinders come in contact with each other.

The second cutting means may be adjustable.

Brief Description of the Drawings

The characteristics of a dual roll unwinding apparatus in accordance with the present invention provided with a roll splicer will be more apparent from the following detailed description of its variations, given by way of example only, not limiting and given with reference to the accompanying drawings.

Figure 1 schematically shows a front view of the installation in accordance with the present invention.

Figure 2 shows a section of the installation along the line II-II of figure 1, and some details are omitted for simplification.

Figures 3a-3h show front views, similar to Figure 1, but with an increase in the splicing device of the installation, in successive steps of the procedure for splicing the rear end of one web with the front end of another web,

FIGS. 4 and 5 show, respectively, longitudinal and axial views of the splicing cylinder of the splicing device shown in FIGS. 1-3.

Figure 6 shows an axial view of a pneumatic distribution flange associated with the cylinder shown in figures 4 and 5.

Fig.7 shows a section of the flange along the line VII-VII of Fig.6.

Detailed Description of a Preferred Embodiment

Turning now to FIGS. 1 and 2, an installation according to the present invention is shown which comprises a pair of unwinding shafts 1, 2 located side by side, rotatably supported at one end by a frame 3, so that they lie parallel to each other in the horizontal plane. The rolls B1, B2 of the unwound paper web are placed respectively on the shafts 1, 2. The tubes inside the rolls B1, B2 are coaxially mounted on the shafts 1, 2, from their free end and fixed in place using known devices.

Also known is the configuration of the unwinding drive means, which in this case is shown in the form of two levers 4, 5 of an articulated structure, articulated at one end on the frame 3, around the respective horizontal axes. Each of the two levers 4, 5 can pass over the corresponding shaft 1, 2, in a mirror position relative to the vertical plane of symmetry of the installation, indicated by the position X.

The design of the levers 4, 5 is not described in detail, since it is known and is not a distinctive characteristic of the present invention. Suffice it to say that the material from the rolls B1, B2 is unwound due to tangential contact with the corresponding drive belts 4a, 5a passing between the sets of tension rollers 4b, 5b (two of which, one on the belt, have a drive), which are rotatably supported using levers 4, 5. The angular movement of these levers around the hinge end is controlled using the corresponding lifts 6, 7. An obvious advantage of this solution is that it is not necessary to adjust the rotation speed the drive to maintain a constant feed rate of the unwinding material when the roll diameter is gradually reduced. Figure 1 shows that the web of material M, after unwinding from the rolls, leaves them in a tangential direction and moves in the direction of the plane of symmetry X, and in particular, in the direction of the cutting and splicing device, indicated in general by 8, which also contains two parts that are mirrored on both sides of the X-plane. The device 8, which is discussed in more detail below, is located somewhat lower than the shafts 1, 2, and the web M enters its upper end. After passing through the device 8, while still in the X plane and, therefore, moving with sliding vertically, the sheet M leaves the bottom of the device and is guided by means of deflecting rollers 9 to a horizontal position, in the immediate vicinity of the floor, and leaves the installation laterally direction to equipment downstream.

The core of the device 8 contains two identical splicing cylinders, indicated by 11, 12, and their horizontal axes are at the same height on each side of the plane of symmetry X. These cylinders are supported by the frame 10 shown in figure 2, so that they can not only rotate around their own axes, but also move horizontally to get closer to each other or move away from each other, and the position in which they are close to each other corresponds to the condition of mutual contact with a certain degree pressure (this creates the pressure necessary to ensure adhesion of the two ends of the web) in the plane of symmetry X. The pressure of the mutual contact can mainly be increased by supplying the working surfaces of the two cylinders with small annular corrugations. In practice, longitudinal protrusions are created along the generatrix of the cylinders, as a result of which a region of a smaller contact surface is formed.

Figure 2 shows the means of bringing the cylinders 11, 12 into rotation, which contains, for example, the respective motors 26, 27 mounted on the frame 3 and connected to the ends of the cylinders using transmissions 28, 29. As discussed in more detail below, the motors 26 , 27 provide rotation of the cylinders 11, 12 synchronously with the speed of the canvases processed in the splicing stage. The translational movement is created using hydraulic actuators 30, built into the frame 10 and also connected to the ends of the cylinders 11, 12. These drive components are shown schematically only as an example, since they can be performed using (any) structural solutions known to specialists in this area.

The splicing cylinders 11, 12 can hold the paper / material M on the working surface 11a, 12a using a vacuum system. Turning now to FIGS. 4-7, which shows cylinder 11 (it should be borne in mind that cylinder 12 is identical to cylinder 11), the working surface 11a of which has a plurality of suction holes 113 located along several uniformly distributed generators (four in this example). The air flow enters through axial channels 114 formed in the cylinder offset from its central axis, so that they (channels 114) pass under the respective rows of holes 113. The channels 114 are open at the ends, on the two outer surfaces 11b of the cylinder shoulders. Corresponding openings and channels in the cylinder 12 can be seen in FIG. 1 and in FIGS. 3a-3h, discussed below, however, they do not have reference numbers to facilitate understanding.

The suction created by the openings 113 in the cylinders 11 and 12 is suitably synchronized by using a system known per se in such a way that the material M is held (pressed against the surface of the cylinder during a given rotation angle, while it is released during the remaining angle in accordance with the necessary control synchronization.For this purpose, the outer surfaces of the shoulders are closed between two synchronization flanges, one of which, schematically shown in Fig.6 and 7, is indicated by s 115.

The flange 115, which is provided with a central hole 115a for the passage of the core of the corresponding cylinder 11, can close the open ends of the respective channels 114. However, along the annular path formed by these channels, there is a distribution passage 115b formed on the inside of the flange 115, i.e. on the side, which is in contact with the outer surface of the cylinder shoulder. The passage 115b contains an arcuate blind recess, the width of which mainly coincides with the diameter of the channels 114.

An axial passage 115c connects the distribution passage 115b to the outside where a suction inlet (not shown) is located. Thus, the distribution passage 115b opens the channels to the outside, with the suction action being created only along the predetermined arc of the path, the length of which is determined by the length along the circumference of the arcuate recess. On the other arc of rotation, on the other hand, the channels will be closed by flange 115, so that there is no suction effect.

We now turn again to the consideration of figure 1, which shows the splicing cylinders 11, 12, interacting with the corresponding first cutters 13, 14 located under the cylinders, and therefore located downstream of the splicing area. The first cutters 13, 14 are shown in FIG. 1 only schematically, and the characteristics of one of the exemplary cutters (cutter 13 associated with cylinder 11) are shown in more detail in FIGS. 4 and 5. It should be noted in particular that cutter 13 can be performed using a cutting disk 13a having a drive motor (not shown) and mounted slidingly on a guide 13b lying along the generatrix of the cylinder 11. Due to the axial movement of the disk, which is pressed against the working surface of the corresponding cylinder, on the blade M is formed I am an incision and it is cut along the generatrix corresponding to the line running crosswise to the canvas.

The tension rollers 15, 16, interacting tangentially with the cylinders 11, 12, which are located under the cylinders 11, 12 and next to the first cutters 13, 14, are removed further from the plane of symmetry X. Two drawers 17, 18 for collecting material M are located directly under the tension rollers 15, 16.

Upstream of the cylinders 11, 12, that is, above them, the device 8 is equipped with a dividing screen 19 lying in the plane of symmetry X, and a pair of deflecting rollers 20, 21, which are mirrored relative to the plane of symmetry and with the help of auxiliary rollers 22, 23 deflecting the canvas M from the plane in which it leaves the corresponding roll, into the plane of symmetry X. Finally, second cutters 24, 25 are shown, shown in FIG. 1, which cut the fabric of material M along the cross-shaped cutting lines immediately upstream the beads 22, 23. The second cutters 24, 25 are completely similar to the first cutters 13, 14, except that they do not interact with the cylinders 11, 12, but with the specific corresponding opposing rods 31, 32.

The installation is controlled using a control system that is not shown in the drawings and is not described in detail because its configuration is obvious in the light of the functional description below.

Let us now turn to the consideration of figa-3h together with the consideration of figure 1, which shows that the installation in accordance with the present invention operates as follows. Figure 1 shows that the roll B1 is unwound normally from the shaft 1, while the material M, as described above, passes through the device 8 and comes out laterally from below, downstream of the deflecting rollers 9. Two splicing the cylinders 11, 12 are in the standby position and are apart from each other, so that they do not interfere with the passage of the material when it is unwound. The other shaft 2 is free and has access to install a full roll of B2, which will need to be spliced with a roll of B1, so that the roll of B2 can replace the roll of B1 during unwinding, when the roll of B1 becomes empty.

Fig. 3a shows that after the installation of coil B2 on the shaft 2, the front end of the sheet material M2 is inserted into the device 8, between the deflecting roller 21 and the separation screen 19 until the edge of the specified front end is caught by the suction system on the corresponding splicing cylinder 12. Meanwhile, the material M1 unwound from the roll B1 continues to slide vertically, with the screen 19 physically separating the two materials, thereby eliminating any risk of interaction between them.

At this point, by means of a control system, splicing is prepared by unwinding roll B2 at a low speed (Fig. 3b). In this phase, the drive belt 5a and therefore also the web on the roll B2 move synchronously with the splicing cylinder 12. The material M2 is held due to the suction force pressed against the cylinder 12 along a predetermined rotation arc, after which it is released and comes into contact with the tension roller 16, in accordance with the time chart established by the distributors 115b of the fixed flanges 115, after which the material is unloaded and collected in a certain amount in the storage box 18 located below until it is reached and perfect alignment of the web and any material defects will not be eliminated.

Fig. 3c shows the next stage, when the forward flow of material is stopped, the cylinder 12 is set so that the suction holes are exactly in phase with the cutter 14, which is used to make a cross-sectional view, resulting in a material M2 with a smooth, clean edge, which held against the cylinder by suction openings. The fact that the suction force is applied along the specified edge and, therefore, the adhesion with the cylinder occurs along it, allows you to very accurately control its position. The resulting waste S remains in box 18, from where it can then be removed. The cylinder 12, which still maintains synchronism with the rotation of the roll B2, is rotated in the opposite direction, while the cut edge of the end of the sheet, which is still held in place by the suction system, rises to the exact height of the cylinder axes (Fig. 3d).

During the preparation procedure for the leading edge of the roll B2 described above, the roll B1 continues to unwind without interference. When it becomes practically empty, as shown in FIG. 3e, the unwinding is stopped and the actual splicing operation begins between the front end of the material M2 on the full roll B2 and the material M1 on the roll B1. Two splicing cylinders 12 and 13 are brought into mutual contact, and the pressure necessary to connect the two material webs together occurs.

Now, the cutter 24, located upstream of the splicing cylinders, acts on the material M1 on the roll B1, making a cross-sectional view (Fig.3f). Due to this, the rear end of the sheet on the roll B1 will have a clean, even edge. The splicing cylinders again begin to rotate at a controlled speed, in synchronism with the speed of a full roll of B2. The splicing is completed when the edge of the rear end M1 passes by the splicing cylinders (FIG. 3g). These cylinders are then moved back to the position in which they are apart from each other (Fig.3f), and stop their rotation, as a result of which the process returns to the initial situation in which the material slides evenly and freely, this time when unwinding from full roll B2. Shaft 1 is now ready to install a new roll after removing an empty tube from it (with any material remaining on it).

The entire procedure described above can be repeated in exactly the same way, but on opposite sides of the installation. Due to the perfectly symmetrical construction of the installation, and in particular the splice device 8, the front end of the full roll can be prepared alternately on one side, and the rear end of the empty roll can be cut off on the other side of the installation.

The installation in accordance with the present invention, first of all, allows precise control of the longitudinal length of the splicing site, since this length is determined by the distance measured along the path of the web between the splicing cylinders 11, 12 and one or the other of the cutters 24, 25 located above to go. In accordance with a possible option, the specified distance can be changed by installing the cutters 24, 25 with the ability to move in accordance with the size (length) of the splice, if necessary.

Another advantage of the installation in accordance with the present invention is the ability to obtain both edges of the spliced ends with high accuracy and purity, thereby eliminating the post-processing stages and the corresponding machines. In particular, the front end of a full roll can be smoothed out with a minimum material consumption due to the preparatory procedure controlled by movement provided by the suction force generated by the splicing cylinders 11, 12.

The cutting and splicing procedure involves only a few elementary operations, so that it can be carried out very quickly, with very little downtime in feeding the unwinding web. Material preparation and cutting, automatically controlled by the suction system, is suitable for a wide variety of soft and soft materials, including tissue paper. Finally, the simple and compact design of the splicing device makes it very economical even from the point of view of maintenance, and when in a reserve state, this device does not interfere with the normal unwinding of the material.

Despite the fact that a preferred embodiment of an apparatus for unwinding rolls of sheet material equipped with a device for splicing rolls has been described, it is clear that changes and additions can be made by specialists in this field that do not go beyond the scope of the claims.

Claims (12)

1. Installation for unwinding rolls (B1, B2) of sheet material, which contains a pair of unwinding rolls (1, 2) for the respective rolls lying on each side of the plane of symmetry (X) of the installation, to feed the specified material to the appropriate equipment, and device (8) for splicing the rear end of the roll (B1), wound from one of these shafts (1), with the front end of a new roll (B2) mounted on the other shaft (2), the splicing device (8) has a symmetrical configuration relative to the specified plane of symmetry and contains a pair of splicing cylinders (11, 12) located on opposite sides of the indicated plane of symmetry, rotating around their respective axes and configured to approach each other and move away from each other, and the approach position of the cylinders coincides with the condition of mutual contact, with some degree pressure, in the indicated plane of symmetry, drive means (26, 27, 30), designed to provide rotation and displacement of these cylinders, groups of suction holes (113) formed along the corresponding generatrices of these cylinders, designed to hold the material on the cylinders and deflect it from the specified plane of symmetry, the first cutting means (13) for cutting across the material held on the cylinder (11), and the second cutting means (24) designed for transverse cutting of the material characterized in that the first cutting means interacting with said cylinder and arranged to be pressed against this cylinder along its generatrix is located below the contact area of this cylinder (11) with another cylinder (12), the second cutting tool is located above these cylinders, while the installation is equipped with control means of the drive (26, 27), synchronizing the rotation of the cylinders with the speed at which the specified material is unwound from the rolls (B1, B2). 2. Installation according to claim 1, characterized in that the plane of symmetry (X) is vertical and separates the unwinding shafts (1, 2) and the splicing cylinders (11, 12) of the splicing device (8), which have horizontal axes, and means are provided deflection (20, 22, 9) of the material in order to feed it into the splicing device (8) from above along the plane of symmetry (X) and then deflect it horizontally downstream from the device (8) under one of the unwinding shafts (1, 2) . 3. Installation according to claim 2, characterized in that it has a deflecting roller (15) for deflecting the material released by the cylinder (11) located below said cutting means (13) with distance from the plane of symmetry (X). 4. Installation according to claim 3, characterized in that under the first cutting means (13) and the deflecting roller (15) is located a means of collecting (17) material cut off by this means, which is removable. 5. Installation according to claim 4, characterized in that the second cutting means (24) located above the cylinder (11) is designed to cut the material when interacting with the opposite rod (31). 6. Installation according to claim 5, characterized in that the second cutting means (24) is located between two rollers (20, 22) of the deflection means, one of which is the main (20), and the other is auxiliary (22) and is located above with a large distance from the plane of symmetry (X). 7. Installation according to any one of paragraphs.2-6, characterized in that each of the cutting means (13, 14, 24, 25) contains a cutting disk (13a), which is mounted with sliding on the guide (13b) along the corresponding line cutting material. 8. Installation according to claim 1, characterized in that said suction openings (113) communicate with internal axial channels (114), which are open at least on one axial end of the corresponding cylinder (11), for communication with the suction means located outside wherein the opening of said channel (114) is closed by means of distribution means (115) to synchronize the suction force in order to control the retention / release of material by the cylinder (11). 9. Installation according to claim 8, characterized in that the distribution means (115) comprises at least one flange (115) located at the outer surface of the shoulder of the cylinder (11) and a distribution passage (115b) formed in said flange (115) ) along the arc of the annular trajectory of the axial channels (114), and the passage (115b) communicates with the outer side of the flange (115) through the suction inlet (115 s) of the suction means. 10. Installation according to claim 1, characterized in that in the plane of symmetry (X) there is a dividing screen (19) that separates the two symmetrical parts of the splicing device (8) above the splicing cylinders (11, 12). 11. Installation according to claim 1, characterized in that the working surfaces of the splicing cylinders (11, 12) are corrugated, so that longitudinal protrusions are formed in order to reduce the area of the contact surface when the cylinders come in contact with each other. 12. Installation according to claim 1, characterized in that the second cutting means (24, 25) is mounted movably with the possibility of adjustment.

Images