EP0453933B1 - Device for cutting of stacked sheet products - Google Patents

Description

The invention relates to a device for cutting stacked, sheet-like material, with a table surface, which has a working area, above which there is a cutting knife and a press beam, behind it an input field for receiving the material to be cut and in front of it an output field for receiving the cut material and with a feed device for the material to be cut, the output field being movable relative to the working field with the formation of a gap and a transverse channel leading to a further processing station being provided on the output field with an ejector movable along the transverse channel, the transverse channel also being situated between a first ruler , which can be tilted around a horizontal axis to support the stack of the cut material during the cutting and then straighten it up again, and one behind the the first ruler, the second ruler, which can be brought into its working position after opening the gap, is formed, and a hold-down device is provided which can be placed on the cut material.

Such a device for cutting stacked, sheet-like material is known from DE 36 13 316 C1. In this case, the two rulers serve, among other things, the purpose of forming the transverse channel through which the cut material located between the rulers, that is to say block strips or blocks, can be pushed out to the further processing station by means of the ejector. In order to securely support the advanced material immediately before the cut, which is necessary due to the geometry of the cutting knife and the parallelogram shape of the material that is present after the cut, it is provided that the first ruler can be tilted about a lower horizontal axis, so that the Support the stack of the cut material during cutting and then align it again vertically against the second ruler moved in its working position after the gap has formed. A hold-down device is placed on top of the material during cutting and improves its hold and also ensures that the sheet-shaped material, especially if it is somewhat brittle, does not jump off the ruler when cutting.

Although the known device has proven itself in practice, it is problematic to handle relatively high stacks of small labels, banderoles or the like in this direction, which is relatively high and narrow in the direction of advance, with an extension of the stacks in the direction of advance of approximately 25 mm maximum being considered here . Especially with thicknesses that are less than 25 mm, the stack tilts when opening the gap because of the angle that results after cutting between its contact surface under the contact surface on the first ruler, which is significantly greater than 90 °, thus before the first ruler in his working position can be spent tipping over.

It is an object of the present invention to develop a device of the type mentioned in such a way that even cut stacks of small thickness can be processed easily and safely.

The object is achieved in that the first ruler has a support surface and a support surface arranged at right angles thereto for the cut material, the support surface essentially forming a plane with the working field when the ruler is in an upright position and such an extension in the feed direction of the material has that is less than the extent of the cut material in the feed direction.

When the gap is closed, the material to be cut is pushed forward with the horizontally oriented contact surface of the first ruler by the desired narrow utility thickness beyond the cutting plane, so that the area of the panel projecting beyond the working area lies completely on the contact surface of the first ruler that forms the starting field. The fact that the support surface essentially forms a plane with the work area, that is to say it coincides with it or is positioned slightly lower so that a step is formed from the work area to the support surface, ensures that the material to be cut is in contact with the support surface of the work surface without impact first ruler can be pushed over. The smaller extent of the work area in the feed direction compared to the extent of the cut material in the feed direction is due to the cutting bar assigned to the work area and set back relative to the separating surface between the work area and the starting area; corresponding to this offset, the first ruler is in the area of its support surface compared to the area to be cut Well shortened. When the cutting knife falls, due to its wedge shape, the material to be cut is shifted in a parallelogram shape, and the first ruler is tilted in accordance with the evasive movement of the material. Because of the right-angled arrangement of the support surface and the support surface of the The first ruler ensures that the panel is held securely in a tilted position by the first ruler at all times during the cutting of the panel and the tilting movement of the first ruler. When the first ruler is tilted, the gap is formed between this and the work area, the second ruler is then extended into its working position and finally the first ruler is tilted back into the horizontal position of the support surface and the vertical position of the contact surface, the respective benefits in this position is defined between the two rulers. Before the panels are ejected, the first ruler is moved slightly away from the panels in the feed direction of the material to be cut, so that any jamming of the panels is removed and these can then be fed to the further processing station by means of the ejector.

The first ruler can preferably be tilted with respect to its contact surface for the cut material by an angle of approximately 30 ° from the vertical away from the cutting plane. The contact surface of the first ruler preferably has an extension in the feed direction of the material to be cut of 10 to 20 mm, in particular 15 to 20 mm, and the cut material preferably an extension in the feed direction of 15 to 25 mm, in particular 20 to 25 mm.

According to a special embodiment of the invention it is provided that the first ruler has two L-shaped legs which have the receiving surface and the contact surface.

To accomplish the tilting movement of the first ruler, a substantially vertically oriented bearing plate is preferably provided, which can be moved and tilted horizontally, and in the bearing plate the leg of the first ruler having the contact surface is movably mounted in the plane of the bearing plate and can be moved essentially in the vertical direction . The first pneumatic cylinders expediently grip with the free ends of their Piston rods spaced apart from the leg intersection line of the legs on the leg of the first ruler having the contact surface pivotably, furthermore, second pneumatic cylinders with the free ends of their piston rods engage at a greater distance from the leg intersection line of the legs on the leg of the first ruler having the contact surface and connect third parties, in essentially in the transverse direction of the bearing plate and the leg having the contact surface acting pneumatic cylinder these legs and the bearing plate non-positively with each other. The leg of the first ruler that has the contact surface should be connected on its end facing away from the leg that has the contact surface to a further bearing leg that is oriented in the opposite direction to the leg that has the contact surface and that receives the third pneumatic cylinder, the piston rods of which attach to the bearing plate on the first ruler opposite side are connected. The action of the ruler or the bearing plate by means of three independently acting force means enables a tilting movement of the first ruler from the vertical position of the leg having the contact surface, which results from a superposition of the movement of the first and second pneumatic cylinders away from the material to be cut and the movement of the first ruler downwards by means of the third pneumatic cylinder. This ensures that the edge of the leg of the first ruler facing the working area does not reach the level of the working area when tilted.

In detail, the first pneumatic cylinders should be able to be moved with a movement component in or opposite to the feed direction of the material to be cut, and the second pneumatic cylinders should be coupled with the first pneumatic cylinders in a movement-locking manner, the movement of the piston rod of the first and second pneumatic cylinders in or against the feed direction of the good to be cut.

Because of the smaller extent of the working area in the feed direction With regard to the extent of the cut material in this direction, the second ruler should be provided on its side facing the starting field with a support strip, the upper support plane of which roughly forms a plane with the contact surface of the first ruler in its horizontal position. The purpose of this embodiment of the second ruler is that its support strip, when the second ruler is extended, supports the benefits that protrude beyond the contact surface of the first ruler.

The holding-down device for fixing the material during cutting is advantageously arranged on the side of the cutting knife facing away from the press beam and can be lowered onto the material synchronously with the knife movement by means of separate adjusting means. The hold-down device is expediently designed as a spring element, in particular a leaf spring element, which has a rotatable hold-down roller which is mounted parallel to the line of intersection of the legs at its lower, distal end.

In order to prevent the benefit from sticking to the contact surface of the first ruler, the leg of this ruler having the contact surface should be provided with a large number of small-diameter through holes. There is therefore no closed investment area for the benefits which could result in the risk of the benefits being attached to the investment area.

Further features of the invention are shown in the description of the figures and in the subclaims, it being noted that all individual features and all combinations of individual features are essential to the invention.

Figur 1

einen Schnitt durch die erfindungsgemäße Vorrichtung im Bereich der Schnittebene, senkrecht zu dieser, vor einem Nutzenschnitt,

Figur 2

eine Darstellung gemäß Figur 1, nach dem Nutzenschnitt,

Figur 3

einen Schnitt durch die Vorrichtung nach erfolgter Spaltbildung zwischen Arbeitsfeld und Ausgangsfeld, bei noch gekipptem ersten Lineal und ausgefahrenem zweiten Lineal,

Figur 4

eine Darstellung gemäß Figur 3 nach dem Überführen des ersten Lineales in die senkrechte Stellung der Anlagefläche, bei abgesenktem Ausstoßer und

Figur 5

eine Ansicht der Vorrichtung gemäß Pfeil A in Figur 1.

In the figures, the invention is shown schematically using an embodiment, for example, without being limited to this. It shows:

Figure 1

a section through the device according to the invention in the region of the section plane, perpendicular to this a utility cut,

Figure 2

1, according to the utility cut,

Figure 3

3 shows a section through the device after the gap has formed between the working field and the starting field, with the first ruler still tilted and the second ruler extended,

Figure 4

a representation according to Figure 3 after transfer of the first ruler into the vertical position of the contact surface, with the ejector lowered and

Figure 5

a view of the device according to arrow A in Figure 1.

FIG. 1 shows a table part 1 of the device with an assigned working area 2, into which a cutting bar 4 running parallel to the front edge 3 of the device is embedded. Above the cutting bar 4 and thus the working area 2 there is a cutting knife 5 and, adjacent to it, a pressing bar 6. The cutting plane running perpendicular to the working area 2 is designated by the reference number 7. On the table part 1, which is formed by the working field 2 and an input field located in the region B of the device, which is not shown in any more detail, there is a stack 8 of stacked, sheet-like material. Behind the stack 8, thus likewise in area B of the device, a feed device is arranged which allows the stack 8 to be advanced in the feed direction, i.e. perpendicular to the cutting plane 7.

At a distance from the table part 1, the device has a further table part 9, in which a carriage 10, which extends perpendicular to the plane of the drawing and is arranged symmetrically to half the length of the cutting bar 4, is movably mounted in the feed direction C and in the opposite direction. The movement of the carriage 10 takes place via force means (not shown in detail) which are let into the table part 9 and act on the carriage 10 at the bottom. Two feed cylinders 11 are provided on the slide 10 symmetrically to one half the length of the cutting bar and about half the length of the cutting bar are mounted. A pivot cylinder 12 is connected to the top of the respective feed cylinder 11 at a distance from it. The cylinders 11 and 12 are pneumatic cylinders, the piston rods 13 of which are oriented horizontally in the feed direction C. The piston rod 14 is guided in the bearing plate 15 with play in its transverse direction in order to take into account the increased engagement distance of the piston rods 13, 14 when the bearing plate 15 is pivoted. 1 shows the extended position of the piston rods 13 and 14. According to the length of the slide 10, a bearing plate 15 is provided which extends perpendicular to the plane of the drawing and is likewise arranged symmetrically to half the length of the cutting bar. With reference to the illustration in FIG. 1, the bearing plate is oriented vertically and the piston rods 13 and 14 engage in pairs at a vertical distance from one another. At a slight lateral distance from the respective piston rods 13 and 14, the bearing plate 15 between the piston rods 14 is provided with two elongated holes 16 that extend vertically over a large part of the width of the bearing plate 15. As can further be seen from the illustration in FIG. 1, the device has a first ruler 17 which consists of a central, vertical leg 17a, a horizontal leg 17b which is connected to the lower end of the vertical leg 17a and is directed counter to the feed direction C, and one with the upper end of the vertical leg 17a connected in the feed direction C horizontal leg 17C. The first ruler 17 is in turn arranged symmetrically to half the cutting bar length, the vertical leg 17a having a height extension that is greater than that of the bearing plate 15. In vertical alignment with the two elongated holes 16, the vertical leg 17a of the first ruler 17 is on the latter the side facing the bearing plate 15 is provided with four bolts 18, two bolts each passing through one of the elongated holes 16 and being at a smaller distance from one another than the length of the associated elongated hole 16, so that the vertical leg 17a of the first ruler 17 and the bearing plate 15 vertically displaceable are. The respective bolts 18 are secured on the side facing the cylinders 12 and 13 by means of screws 19, the distance from the vertical leg 17a and the bearing plate 15 is selected so that the parts can be moved relative to one another without play. On the horizontal leg 17c distributed over its length six lifting cylinders 20 are attached, the downwardly directed piston rods 21 of which pass through recesses in the horizontal leg 17c and engage eyelets 22 attached to the top of the bearing plate 15.

As can further be seen from the illustration in FIG. 1, the first ruler 17, which is guided by means of the bearing plate 15 over the cylinders 11 and 12, is in contact with the table part 1 when the piston rods 13 and 14 are extended with its edge 23 of the horizontal leg 17b facing the table part 1, it being sufficient for the function of the device if a slight gap is formed between the parts. In the position of the piston rods 21 of the lifting cylinders 20 shown in FIG. 1, in which these are extended to the maximum extent, there is a contact surface formed on the surface of the horizontal leg 17b slightly below the level of the working area 2 of the table part 1. The vertical leg 17b of the The first ruler 17 has such a height extension that corresponds approximately to the vertical distance from the table part 1 and the raised press beam 6, the surface of the vertical leg 17a representing a contact surface 25.

Finally, a hold-down device 26 is arranged between the cutting knife 5 and the lifting cylinders 20. An actuator connected to a portal, not shown, of the device, which also receives the cutting knife 5 and the press beam 6, lowers or lifts the hold-down device 26 synchronously with the knife movement. The hold-down device 26 has a spring element 26a connected to the actuator 27, which at its lower end remote from the knife has a hold-down roller 26b which is mounted parallel to the cutting bar 4 and extends over the length of the first ruler 17.

The mode of operation of the device is described below:

Starting from the illustration in FIG. 1, the material 8 to be cut is pushed so far by means of the feed device (not shown in more detail) that it comes into contact with the vertical leg 17a of the first ruler 17. The good 8 is thus a length to be cut beyond the cutting plane 7, after the cut, a benefit 8 'should be available. It can be a single benefit 8 'is formed, which extends over the entire width of the stack 8, but primarily it is contemplated that there are already a plurality in the feed direction C oriented, side by side stack 8, so that after cutting individual in Viewing direction perpendicular to the plane of the drawing arranged blocks as benefit 8 'arise.

When the cutting knife 5 comes down, immediately upon contact of the knife tip with the stack 8, the hold-down roller 26b moved down synchronously with the cutting knife 5 onto the partial stack or the blocks 8 'and presses it against the first ruler 17 in synchronism with the further cutting process Cutting the stack 8 and thus the formation of the benefit 8 'takes place the tilting of the first ruler 17 in the direction of arrow D about a horizontal axis parallel to the cutting bar 4, which coincides approximately with the front edge 3 of the table part 1. The tilting movement is composed of the superimposition of three movements, namely the retracting movement of the piston rods 13 of the feed cylinders 11, the retracting movement of the piston rods 14 of the swivel cylinders 12 and the retracting movement of the piston rods 21 of the lifting cylinders 20. The movement of the feed cylinders 11 essentially leads to a retraction of the first ruler 17, the movement of the pivot cylinder 12 to pivot this ruler and the movement of the lifting cylinder 20 leads to the first ruler 17 being moved relative to the bearing plate 15 which is stationary with respect to the piston rods 13 and 14. The tilted end position of the ruler 17 results from the illustration in FIG. 2, This can be seen that the cut or the cut 8 'contact the support surface 24 and the contact surface 25 of the first ruler 17 and the hold-down roller 26b is supported on this. The figure shows that the first ruler 17 is tilted away from the cutting plane 7 with respect to its contact surface 25 by an angle of approximately 30 ° from the vertical. The possibility of guiding the slide 10 in the table part 9 serves the purpose of being able to set different useful strengths, but of course it is then also necessary to convert the device with respect to the first ruler 17 with respect to the extension of the horizontal leg 17. The table part 9 can also be moved in the feed direction C and in the opposite direction and, as can be seen from the illustration in FIG. 3, after the utility cut and the lifting of the hold-down device 26, it is moved in the feed direction, so that it is different from the situation in FIGS. 1 and 2 enlarged gap 28 results. A second ruler, which has been arranged below the table part 9 and extends over the entire length of the first ruler 17, is then moved vertically upwards, the distance from the second ruler 29 and the further tilted first ruler 17 being dimensioned such that when being returned of the first ruler 17 in the position in which the leg 17a is again oriented vertically, the surface facing away from the contact surface 25 of the panel 8 'comes into contact with the second ruler 29. The movement of the ruler into said vertical position of the vertical leg 17a takes place by extending the piston rods 13 and 14 and 21 of the cylinders 11, 12 and 20, so that the horizontal leg 17b of the first ruler 17 again comes to lie on the same level , as shown in Figure 1. The situation described is illustrated in FIG. 4, which can also be seen from the fact that the second ruler 29 on its side facing the first ruler 17 is provided at the level of the horizontal leg 17b with a support bar 30 which extends perpendicular to the plane of the drawing over the entire length of the ruler 29 , whose upper support plane 31 forms approximately a plane with the contact surface 24 of the first ruler 17. In the way between the two Rulers 17 and 29 created cross channel 32 is behind the panel 8 'an ejector 33 down to the bearing surface 24 of the first ruler 17. It is then moved by a corresponding retraction of the piston rods 13 and 14 of the cylinders 11 and 12, the first ruler 17 slightly away from the second ruler 29, so that the benefit 8 'without jamming between the two rulers 17 and 29 in the longitudinal direction of the transverse channel by means of Ejector 33 can be pushed out to a further processing station, not shown.

The transfer of the first ruler 17 into the position shown in FIG. 1 takes place after the ejector 33 is raised and the second ruler 29 is lowered, and the table part 9 is moved back in the direction of the table part 1 and the piston rods 13 and 14 of the cylinders are completely extended again 11 and 12.

FIG. 5 illustrates, inter alia, that the vertical leg 17a of the first ruler 17, which has the contact surface 25, is provided with a large number of through holes 24 of small diameter.

In the device described, the support surface 24 of the first ruler 17 forms the starting field of the table surface. There is, however, a possibility that the surface 35 of the table part 9 also functions as an initial field, namely when the first ruler 17 is moved in the feed direction from the area of the table part 9 facing the table part 1 and the gap 28 between the table part 1 is moved Both table parts 1 and 9 are completely closed, so that the table surface is a continuous surface of work area 2 and surface 35, ie the starting area. In such a manner of use, chips produced in the case of edge or intermediate cuts can be disposed of downwards by opening the gap 28 beforehand.

Reference list

1

Table part

2nd

Field of work

3rd

Leading edge

4th

Cutting bar

5

Cutting knife

6

Press beam

7

Cutting plane

8th

stack

8th'

Use

9

Table part

10th

carriage

11

Delivery cylinder

12th

Swivel cylinder

13

Piston rod

14

Piston rod

15

Bearing plate

16

Long hole

17th

first ruler

17a

vertical leg

17b

horizontal leg

17c

horizontal leg

18th

bolt

19th

screw

20th

Lifting cylinder

21

Piston rod

22

eyelet

23

Edge

24th

Contact surface

25th

Contact surface

26

Hold-down

26a

Spring element

26b

Hold-down roll

27

Actuator

28

gap

29

second ruler

30th

Support bar

31

Support level

32

Cross channel

33

Ejector

34

Through hole

35

surface

Claims (13)

1. A device for cutting stacked sheet material (8), with a table area which has a field of action (2) above which a cutting knife (5) and a crosshead (6) of a press are located, with an input field (24) behind it for receiving the material to be cut (8) and an output field in front of it for receiving the cut material (8′), and with a forward feed device for the material to be cut, wherein the output field (24) is movable in relation to the field of action (2) with the formation of a gap (28) and a transverse channel (32) leading to a further processing station and having an ejector (33) which can move along the transverse channel (32) is provided on the output field (24), wherein in addition the transverse channel (32) is formed between a first guide plate (17), which can tilt about a horizontal axis in order to support the stack of cut material (8′) during cutting and subsequently to set it upright, and a second guide plate (29) which is situated behind the first guide plate (17) and which can be brought into its operating position after the gap (28) has opened, and a holding-down device (26b) is provided which can be placed on the cut material (8′), characterised in that the first guide plate (17) has a support area (24) and a contact area (25), disposed at a right angle to the support area, for the cut material (8′), wherein when the guide plate (17) is in its upright position the support area (24) substantially forms a plane with the field of action (2) and has an extent in tne direction of advance (C) of the material (8, 8′) which is less than the extent of the cut material (8′) in the direction of advance (C).
2. A device according to claim 1, characterised in that the first guide plate (17) can be tilted away from the cutting plane (7) so that its contact area (25) is tilted by an angle of about 30° from the vertical.
3. A device according to claim 1 or 2, characterised in that the support area (24) preferably has an extent of 10 to 20 mm, most preferably 15 to 20 mm, in the direction of advance (C) of the material to be cut (8), and the cut material (8′) preferably has an extent of 15 to 25 mm, most preferably 20 to 25 mm, in the direction of advance (C).
4. A device according to any one of claims 1 to 3, characterised in that the first guide plate (17) has two limbs (17a, 17b) disposed in the shape of an L, which in turn comprise the contact area (25) and the support area (24).
5. A device according to any one of claims 2 to 4, characterised in that a bearing plate (15) is provided, which is oriented substantially vertically and which can be moved horizontally and tilted, and the limb (17a) of the first guide plate (17) comprising the contact area (25) is mounted on the bearing plate (15) so that it is movable in the plane of the bearing plate (15) and can travel substantially in a vertical direction.
6. A device according to claim 5, characterised in that first pneumatic cylinders (11) pivotally engage on the limb (17a) of the first guide plate (17) comprising the contact area (25) with the free ends of their piston rods at a distance from the line of intersection of the limbs (17a, 17b), second pneumatic cylinders (12) pivotally engage on the limb (17a) of the first guide plate (17) comprising the contact area (25) with the free ends of their piston rods (14) at a greater distance from the line of intersection of the limbs (17a, 17b), and third pneumatic cylinders (20), which act substantially in the transverse direction of the bearing plate (15) and of the limb (17a) comprising the contact area (25), non-positively connect the said limb (17a) and the bearing plate (15) to each other.
7. A device according to claim 6, characterised in that the limb (17a) of the first guide plate (17) comprising the contact area (25) is attached at its end remote from the limb (17b) comprising the support area (24) to a further bearing limb (17c), which is oriented in the opposite direction to the limb (17b) comprising the support area (24) and which receives the third pneumatic cylinders (20), the piston rods (21) of which are attached to projections on the bearing plate (15) on its side remote from the first guide plate (17).
8. A device according to claim 7, characterised in that the tilting movement of the first guide plate (17) from the vertical position of the limb (17a) comprising the contact area (25) is produced by a superposition of the movement of the first and second pneumatic cylinders (11, 12) away from the material to be cut (8) and of the movement of the first guide plate (17) downwards by means of the third pneumatic cylinders (20).
9. A device according to any one of claims 3 to 8, characterised in that the first pneumatic cylinders (11) can travel with a component of motion in or opposite to the direction of advance (C) of the material to be cut (8) and the second pneumatic cylinders (12) are motionally coupled to the first pneumatic cylinders (11), wherein the movement of the piston rods (13, 14) of the first and second pneumatic cylinders (11, 12) takes place in or opposite to the direction of advance (C) of the material to be cut (8).
10. A device according to any one of claims 1 to 9, characterised in that the second guide plate (29) is provided with a support strip (30) on its side facing the output field (24; 35), the upper support plane (31) of which support strip approximately forms a plane with the support area (24) of the first guide plate (17) when the latter is in its horizontal position.
11. A device according to any one of claims 1 to 10, characterised in that the holding-down device (26), which can be lowered on to the material to be cut (8′) synchronously with the knife movement via separate control means (27), is disposed on the side of the cutting knife (5) remote from the crosshead (6) of the press.
12. A device according to claim 11, characterised in that the holding-down device (26) comprises a spring element (26a) which has a rotatable holding-down device roller (26b) mounted parallel to the line of intersection of the limbs at its lower end remote from the knife.
13. A device according to any one of claims 4 to 12, characterised in that the limb (17b) of the first guide plate (17) comprising the contact area (25) is provided with a plurality of through-holes (34) of small diameter.

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