HK1108009B - Transport device for a band knife and method for mounting and dismounting a band knife - Google Patents

Description

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The invention also relates to a band-cutting knife which can be used with such a transport device.

Finally, the invention also relates to methods for the assembly and disassembly of a band knife, in particular a sharp band knife.

A band saw of the type mentioned at the outset is known from DE 38 15 130 A1 and a band saw with holes attacking the drive pins of a drive wheel is known from German patent 328 104.

DE-A-28 11 738 also reveals a tape cartridge for an endless tape knife that is soluble and connected to the base of a cutting machine for replacement or cleaning.

A band knife of the familiar type is used as a cutting tool for a splitting machine, usually in the form of an endless steel band running over two bands, at least one of which is driven.

For example, in a split operation, a piece of leather in the shape of a sheet is held against the high-speed rotating tape knife to split the piece into two pieces of less thickness.

To ensure a consistently high quality of the splitting process and to avoid tearing the material instead of cleaning it cleanly, the ribbon cutter must have a sharp cutting edge.

To meet these requirements, the following working procedure has been established: when the strip knife is mounted, it is first placed on the machine and tightened, then the strip knife is driven and sharpened by means of a cutting device provided for the splitter.

If the cutting edge cannot be sharpened further because it is less than the required width and must therefore be removed from the machine, it should be noted that the cutting edge is usually still sharp enough to prevent cutting.

Although this approach is widespread and practical in principle, in practice problems arise in certain applications.

The use of a tape measure in the manufacture of a new type of machine is not permitted, but it is not necessary to use a new type of machine, as the use of a new type of machine is not permitted.

This means, however, that the cutting knife would have to be moved from the grinding machine to the splitting machine in the sharpened state. Since the cutting knife is usually sharpened to a razor, the user can cause serious cut injuries even with the slightest negligence.

Against this background, the present invention is intended to specify a cost-effective tape measure and a transport device for a tape measure, and procedures for the safe installation and disassembly of a tape measure that facilitate the handling of a sharp tape measure in cleanroom conditions, in particular to further meet other requirements, such as the purity of the tape measure obtained by de-dusting, vacuuming, wet cleaning or autoclave sterilization.

is solved by an endless band knife with a cutting edge-like front surface, with at least two exceptions for the inclusion of supporting elements, according to one aspect of the invention.

This task is solved by a conveyor device for an endless band knife, in particular for a sharp band knife, which has a housing element and at least two support elements designed to intervene in the band knife's exceptions.

A belt-drive knife suitable for use with such a transport device shall have at least two openings into which the transport device's supporting elements can enter.

The invention is further solved by a process for dismantling a band knife, using the steps: Install a conveyor device over the belt anchorage held at the splitter on two discs, so that the belt anchorage is at least partially enclosed by a housing element of the conveyor,Install at least two housing support elements at the gaps of the belt anchorage,Span the belt anchorage by means of the gaps' support elements,Transfer the belt anchorage from the splitter discs to the tensioned support elements,and Remove the conveyor device from the splitter with the belt anchorage.

Finally, the invention also solves the problem by means of a method for mounting a band saw, which consists of the following steps:preparing a conveyor in which a band saw is held tensioned by at least two support elements attached to a housing element at the band saw's outlets;placing the conveyor over two band saw discs of the splitter machine so that the band saw is positioned radially apart or partially perpendicular to the perimeter surfaces of the bands;taking over the band saw from the support elements under tension on the bands of the splitter machine;relaxing the band saw by means of the support elements at the outlets;removing the band saw from the band saw's outlets without removing the band saw's outlets; and taking the direction of the splitter machine.

A special feature of the invention is that the steps which previously required the user to touch the tape measure can now be performed without the user having to touch the tape measure; it is also possible to prevent the tape measure from touching the conveyor during transport, cleaning or other handling, in particular by allowing the tape measure to be cleaned particularly thoroughly and, if necessary, sterilised within the conveyor.

For the sake of simplicity, the following description refers to a splitter machine as an example, but it should be noted that the belt blade, the conveyor and the processes can also be applied to other devices, such as a properly trained grinder that can accommodate a belt blade on two discs.

Since the belt buckle has exceptions for the inclusion of supporting elements, it is now possible to hold the belt buckle by intervening or inserting supporting elements at the exceptions. If the belt buckle is released on the splitter, a support of the belt buckle is ensured by the supporting elements intervening at the exceptions. The belt buckle can thus be removed from the splitter without the need to touch the knife itself, in particular not the cutting edge.

Similarly, a sharpened, sterilized tape knife can be mounted on the splitter itself without contact with the tape knife.

The invention allows the dismantling of a tape measure as follows: first, the tape measure is mounted and tensioned on the splitter. First, a transport device is placed over the tape measure. A housing element of the transport device encloses the tape measure so that the user can no longer come into contact with the cutting edge of the tape measure.

In order to prepare the transfer of the tape measure from the splitter to the transport device, the fasteners are now placed on the bands of the splitter. In another step, the tape measure is tensioned by means of the fasteners to the fasteners. This tension ensures that the tape measure remains in a fixed shape and does not simply return to its resting shape, which is usually circular. The tape measure is now taken over from the bands of the splitter to the fasteners under tension.

The conveyor with the belt-knife, which is supported by the supporting elements, can now be removed from the splitter.

The mounting of the tape measure in a conveyor is done in reverse, i.e. a conveyor with a tape measure inside is placed over two discs of the splitter in such a way that the tape measure is positioned radially away from or partially in contact with perimeter surfaces of the discs.

The belt buckle is taken from the support elements under tension onto the belt discs of the splitter, the belt buckle is relaxed by means of the support elements, the support elements are removed and the conveyor is removed without the belt buckle, without the need to touch the belt buckle, so that the belt buckle can be sterile mounted.

The elongated form inside the conveyor also facilitates sterilization in an autoclave.

The above problem is thus completely solved.

In one embodiment of the invention, the band-cutter has at least two pairs of exceptions to accommodate one support element in each.

A pair of exceptions is intended to be understood as two exceptions which interact with the same restraint when the belt gauge is kept in the transport device, so that a pair of exceptions can be thought of as being a restraint even if the belt gauge is outside the transport device.

The allocation of a pair of exceptions is made in particular when two exceptions are approximately opposite on a longitudinal axis of the band-minder. The longitudinal axis of the band-minder is to be understood as the axis which runs parallel to the longest extension of the band-minder when the band-minder is mounted on the splitter.

A device may have two ends, the first of which is in a first pair of torque couplers and the second in a second pair of torque couplers.

In a further development of the invention, the exceptions are made as holes.

In this way, a simple and safe support of the band saw against the support element can be achieved. In principle, the cross section of the hole can have any shape. However, stability and manufacturing advantages are expected if the holes are made in a circular shape, especially as a borehole. This is especially advantageous if the center axes of the holes run essentially parallel to the area normals of the band saw.

In a further embodiment of the invention, the gaps are placed in the middle between the cutting edge and the opposite face of the band knife or on the half of the band knife away from the cutting edge.

If the gaps are chosen to be in the middle between the cutting edge and the opposite face of the tape measure, good mechanical stability and balanced absorption of the tape measure under stress are obtained; if, on the other hand, the gaps are placed on the half of the tape measure which is farther from the cutting edge, on the one hand, a possible mechanical effect of the gaps on the cutting edge can be minimized or prevented.

In a further development of the invention, the conveyor has a tensioning element to absorb the belt buckle inside the housing element under tension.

This allows the shape of the tape measure to be determined in a particularly good way within the transport device and prevents it from changing shape (and touching the housing element, for example) or even detaching from its holder during transport, cleaning or other handling, for example by vibration or thermal expansion.

In another embodiment of the invention, the belt-drive knife is held in the transportable state by means of the support elements only on the edges of the belt-drive knife without touching the housing element.

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In a further development of the invention, the supporting elements work together with a pair of exceptions to hold the belt knife.

This allows the belt blade to be held reliably within the conveyor with relatively little effort.

In a further development of the invention, the support elements are soluble on the housing element and preferably contained in housing element recesses.

In this embodiment, the support elements can be separated from the conveyor, which makes it particularly easy to handle the fixing and loosening of the belt gauge in relation to the conveyor. When the support element is inserted into the housing, the support element also passes through the corresponding band gauge outlets. In the preferred embodiment, the support elements are also carried in the outlines of the housing. This is simple and inexpensive.

In a further development of the invention, the supporting elements are presented as longitudinal rod-shaped elements.

This allows for easy interaction with the housing element in a simple way, such holding elements can be easily guided through the gaps in the band-measuring device and inserted into gaps on the housing element.

In a further development of the invention, the supporting elements have a circumferential groove at each of their ends which attaches to the edges of the band gauge.

The perimeter nut of a support element interacts with the edge of an associated exception by the edge being in the perimeter nut when the band gauge is tightened. A displacement of the band gauge relative to the support element is then only possible in a very limited play within the perimeter nut, unless the tension force prevents the movement of the band gauge already.

In a further development of the invention, the support elements in the housing element are essentially parallel to each other.

This embodiment allows for simplified insertion and removal of the restraint elements.

In a further development of the invention, the coupling element is designed to move the support elements essentially parallel to each other.

The parallel displacement of the clamping element allows the clamping of the belt buckle to be easily achieved by moving the supporting elements away from each other, thus increasing the distance between the supporting elements.

Since the tape measure is made of a material which has only a very low longitudinal tensile strength, the actual way in which the supporting elements are moved is not decisive for the tension of the tape measure, but the force transmitted by the tension element to the tape measure by means of the supporting elements is the size to be observed.

To relax the belt buckle during or after installation on the splitter in relation to the conveyor, the tensioner is relaxed and the belt buckle counterpressure moves the supporting elements towards each other, if necessary only slightly, as explained above.

In a further development of the invention, the clamping element is formed as a sliding bracket with a handle and lever.

The force exerted by a bracket in the wire bracket design on the support elements is sufficient for many applications. If a higher tensile strength is desired or required, this can be achieved by a more stable or reinforced design of the bracket. The springing property of the (wire) bracket is advantageous for compensating for the loads described above (shaking, expansion).

It should be noted that a tension can also be achieved with one or more spring elements, which may be in particular shaped as screw springs and which can apply a force to at least one holding element to tensile strength of the belt buckle.

In a further embodiment of the invention, the housing has a floor element and at least one wall element.

In this way, a low cost housing element can be created, in particular the wall element can cover the entire width of the strip knife to be taken up, so that the housing element can enclose the strip knife and is only open on the side facing it during the assembly or disassembly of the splitter.

In a further development of the invention, the housing element is lockable by means of a housing cover when a tape measure is used.

The tape measure can be transported in the closed conveyor while the lid can be removed for cleaning and, if necessary, sterilisation to allow better access of detergent or steam.

In a further embodiment of the invention, the tape measure is first adjusted on the tape discs so that each pair of adjacent gaps is opposite to each other. This may be done by providing a suitable marking on the splitter that makes this position visually identifiable. Then an elongated rod-shaped support element is inserted through each pair of adjacent gaps to hold the tape measure with the ends of the support elements to the gaps.

In a further embodiment of the invention, when the belt cutter is dismantled after the belt cutter is tightened, the belt cutter is relaxed on the splitter by means of the support elements on the conveyor.

This ensures that the belt-drive is taken over by the conveyor in the tensioned state.

In a further embodiment of the invention, when the tape knife is mounted, the tape knife is tightened on the splitter by means of the support elements in the conveyor before the tape knife is released.

This ensures that the tensioned knife is taken over by the splitter.

It is understood that the features described above and those to be explained below are applicable not only in the respective combination but also in other combinations or alone, without leaving the scope of the present invention.

The following illustration shows examples of the invention and is explained in more detail in the following description: Figure 1a front view of a conveyor with a belt gauge contained in it to be mounted on a splitter;Figure 2a rear view of this conveyor with a belt gauge contained in it; andFigure 3a detailed view of a supporting element in an exception to the belt gauge.

Figure 1 shows a conveyor device 10 to mount a belt gauge 12 on a splitting machine 14; as the operation of a splitting machine 14 is known, for further explanation only the discs 16, 18 and the splitting area 20 are given reference marks.

The purpose of the mounting of the band knife 12 is to wrap the band knife 12 around the band discs 16, 18.

The transport device 10 shown has a housing element 22 and two support elements 24, 26. Each of the support elements 24, 26 has two ends 28, which serve to support the belt buckle 12.

The support elements 24, 26 are made as longitudinal rod-shaped elements, which are essentially parallel to each other. The support elements 24, 26 are made in gaps 34 of the housing element 22. In the shown view, only the upper gaps 34 are visible, while the lower gaps 34 are covered on the opposite side of the housing element 22. The support elements 24, 26 can be removed from gaps 34 in the transport device 10 shown here.

The supporting element 36 is fitted with two grip elements 38 on the housing element 22 and is fitted with guide sleeves 40 in combination with guide bolts 42 attached to the splitter 14 which allow the precise positioning of the conveyor 10 in relation to the splitter 14 and in particular to the disc 16, 18 and the splitter 20.

The conveyor 10 also has a spring element 44; the spring element 44 is located in a swaying position around an axis 46 and is made as a bracket (here a wire bracket); the spring element 44 has a handle 48 and a lever 50, although in this respect the lever 50 is mostly covered by the housing element 22.

The displacement of the support elements 24 and 26 relative to each other is achieved by displacement of the support element 24 in the example shown here, but such displacement can also be achieved by the movement of both support elements 24, 26.

The housing element 22 has a floor element 52 and wall elements 54 and the housing element 22 has mounting areas 56 to which a housing cover 58 (symbolically shown in Figure 2) can be attached to cover the housing element 22.

It is advantageous to fix the housing lid 58 by means of clipping elements, such a lid 58 being fixed to the rear side of the conveyor 10 as shown in Figure 2.

Fig. 2 shows the rear view of the conveyor 10. The holder of the belt gauge 12 is now better visible. The belt gauge 12 has an inner and an outer belt area 60, 62. The front face facing the floor element 52 is made as the cutting edge 64. On the belt area 60 are the exceptions 66 which are made here as continuous holes.

When, in the context of this example, we speak of a pair of exceptions 66 below, we mean exceptions 66 which are opposite in relation to a longitudinal axis of the tape measure 12 incorporated in the conveyor 10 in the transportable condition.

If the position of one of the restraint elements 24, 26 is considered, it is apparent that the restraint elements 24, 26 are each located in an upper and a lower recess 34 of the housing element 22 and pass through the pair of exceptions 66 assigned to them.

The special feature is that the belt gauge 12 only touches the support elements 24, 26 at very small contact surfaces, which prevents further contact, especially with the housing element 22, and which makes it possible to clean and sterilize the belt gauge 12 very well inside the conveyor device 10 and to protect it against possible mechanical damage caused by contact with the housing element 22.

It is also apparent that the lever 50 of the coupling element 44 exerts a force in the upper area (covered here) and the lower area of the support element 24 in the direction of the arrow, in the tense state, thus keeping the belt gauge 12 tense within the conveyor device 10.

Fig. 3 shows a detailed view of the support element 24 whose end 28 has a circumference nut 30. It shows the condition after the support element 24 has penetrated the outlet 66 and the spanner element 44 has been tightened. It can be seen that an edge of the outlet 66 is now in the circumference nut 30. This prevents movement of the band gauge 12 along the support element 24, here in a vertical direction.

With reference to Figure 3, it should be noted once again that the belt gauge 12 is only attached to very small contacts on the 24 and 26 restraint elements.

After the figures have been explained, an example of a method for mounting a tape measure 12 is now to be described.

Figure 2 shows the position in which the tape measure 12 was transported within the conveyor device 10.

The discs 16, 18 of the splitter 14 are in a position where the strip knife 12 can be mounted, i.e. one of the discs 16, 18 has been moved to a relaxed position towards the other disc.

The grip elements 38 position the conveyor 10 to the splitter 14 so that the guide bolts 42 can be inserted into the guide sleeves 40 to ensure that the belt gauge 12 is correctly positioned in relation to the discs 16, 18 and the split area 20.

The conveyor 10 is then pushed so far in the direction of the splitter 14 that the belt gauge 12 is radially spaced, possibly touching, to perimeter surfaces of the discs 16, 18.

The first step is to tighten the strip knife 12 on the splitting machine 14 by increasing the spacing between the strip discs 16, 18.

During transport, the belt gauge 12 was held in tension inside the conveyor device 10 and this tension is now released by pulling on the handle element 48 of the belt element 44.

Finally, the conveyor 10 can now be removed without the tape measure 12 and a sharp tape measure 12 can be securely mounted on a splitter 14 without having to touch the tape measure 12 itself.

To remove the tape measure 12 from the splitter 14, the procedure described above is performed in reverse order.

First, the conveyor 10 is driven by the guide bolts 42 and pushed so far on the splitter 14 that the conveyor 10 is mounted on the belt gauge 12 and the support elements 24, 26 are inserted into the gaps 34 of the housing element 22 so that they also pass through a pair of exceptions 66 of the belt gauge 12.

The next step is to press the handle 48 of the clamping element 44 to tighten the band knife 12 inside the conveyor device 10. The band knife 12 is then released by the splitter 14 by moving the discs 16, 18 on top of each other.

After removal of the conveyor 10, the housing element 22 may be closed with the housing lid 58 to allow the belt buckle 12 to be transported safely.

The invention makes it possible to move a sharp band knife between different devices, e.g. between a grinding machine and a splitting machine, without danger to the user, and to clean and sterilize a sharpened band knife. A suitable grinding machine is equipped with two bands on which a band knife can be mounted as on a splitting machine. The knife is set in motion on the grinding machine and sharpened.

After grinding, the sharpened tape measure can be removed by the conveyor in the same way as a splitter, and then cleaned and sterilised in the conveyor.

The invention opens the possibility that the tape measure no longer needs to be sharpened on the splitter. Since the grinding process can now take place in another area or in another room and the sharp tape measure can still be safely transported, it is now possible to set up sharp tape measures under clean room conditions.

Claims (19)

1. A transport device (10) for an endless rotation hoop knife (12), in particular for a sharp rotation hoop knife (12), comprising a housing member (22) and at least two retaining members (24, 26) which are configured to engage in openings (66) in the rotation hoop knife (12).
2. The transport device (10) of claim 1, comprising a tensioning member (44) for accommodating the rotation hoop knife (12) in a tensioned state inside the housing member (22).
3. The transport device (10) of claim 1 or 2, wherein the rotation hoop knife (12) in the transportable state is held by means of the retaining members (24, 26) solely at the openings (66) in the rotation hoop knife (12), without touching the housing member (22).
4. The transport device (10) of any of claims 1 to 3, wherein the retaining members (24, 26) each co-operate with a pair of openings (66) to hold the rotation hoop knife (12).
5. The transport device (10) of any of claims 1 to 4, wherein the retaining members (24, 26) are detachably accommodated on the housing member (22), each preferably being guided in cutouts (34) in the housing member (22).
6. The transport device (10) of any of claims 1 to 5, wherein the retaining members (24, 26) are embodied as elongate rod-shaped members.
7. The transport device (10) of any of claims 1 to 6, wherein the retaining members (24, 26) each have a peripheral groove (36) at their ends (28) which engage the openings (66) in the rotation hoop knife (12).
8. The transport device (10) of any of claims 1 to 7, wherein the retaining members (24, 26) are guided substantially parallel to each other inside the housing member (22).
9. The transport device (10) of any of claims 1 to 8, wherein the clamping member (44) is configured for substantially parallel displacement of the retaining members (24, 26) in relation to each other.
10. The transport device (10) of any of claims 1 to 9, wherein the clamping member (44) is configured as a pivotable yoke comprising a grip portion (48) and a lever portion (50).
11. The transport device (10) of any of claims 1 to 10, wherein the housing member (22) has a base member (52) and at least one wall member (54).
12. The transport device (10) of any of claims 1 to 11, wherein the housing member (22) can be closed by means of a housing cover (58) when the rotation hoop knife (12) is installed.
13. The transport device (10) of any of claims 1 to 12, further comprising an endless rotation hoop knife (12) having at least two openings (66) which are configured for receiving the retaining members (24, 26) of the transport device (10).
14. A method for dismantling a rotation hoop knife (12), in particular a sharp rotation hoop knife (12), from a splitting machine (14), comprising the following steps:

    - placing a transport device (10) over the rotation hoop knife (12) held on two discs (16, 18) in the splitting machine (14), in such a way that the rotation hoop knife (12) is at least partially enclosed by a housing member (22) of the transport device (10),

    - fixing at least two retaining members (24, 26) held on the housing member (22) at openings (66) in the rotation hoop knife (12),

    - tensioning the rotation hoop knife (12) by means of the retaining members (24, 26) at the openings (66),

    - transferring the rotation hoop knife (12) in a tensioned state from the discs (16, 18) of the splitting machine (14) onto the retaining members (24, 26), and

    - removing the transport device (10) containing the rotation hoop knife (12) from the splitting machine (14).
15. The method of claim 14, wherein retaining members (24, 26) are used which each engage a pair of assigned openings (66) embodied as holes.
16. The method of claim 15, wherein said rotation hoop knife (12) is initally placed on the discs (16, 18) in such a way that each pair of mutally assigned openings are opposite each other, such that an elongate, rod-shaped retention member (24, 26) is then inserted through each pair of assigned openings (66) in order to hold the rotation hoop knife (12) at the openings (66) by the ends (28) of the retaining members (24, 26).
17. The method of any of claims 15 or 16, wherein said rotation hoop knife (12) is locked, after the retaining members (24, 26) have been inserted through the assigned openings (66), in assigned peripheral grooves (30) at the ends (28) of the retaining members (24, 26).
18. The method of any of claims 15 to 17, wherein said rotation hoop knife (12) is de-tensioned on the splitting machine (14) after the rotation hoop knife (12) has been tensioned on the transport device (10) by means of the retaining members (24, 26).
19. A method for mounting a rotation hoop knife (12), in particular a sharp rotation hoop knife (12), onto a splitting machine (14), comprising the following steps:

    - providing a transport device (10) wherein a rotation hoop knife (12) is held in a tensioned state at openings (66) in the rotation hoop knife (12) by at least two retaining members (24, 26) accommodated on a housing member (22),

    - placing the transport device (10) over two discs (16, 18) of the splitting machine (14) in such a manner that the rotation hoop knife (12) is positioned radially spaced apart from or partially touching peripheral surfaces of said discs (16, 18),

    - transferring the rotation hoop knife (12) in a tensioned state from the retaining members (24, 26) onto the discs (16, 18) of the splitting machine (14),

    - de-tensioning the rotation hoop knife (12) by means of the retaining members (24, 26) at the openings (66),

    - removing the retaining members (24, 26) from the openings (66) of the rotation hoop knife (12), and

    - removing the transport device (10) without the rotation hoop knife (12) from the splitting machine (14).