JPH0224098A - Method and device for roundly cutting corner of deposited sheet - Google Patents

Abstract

PURPOSE: To efficiently round-off the corners of the piles of sheets by fixing two adjoining piles of sheets into the action region of a punching tool at constant intervals, and also rounding off a preceding rear corner and a succeeding fore corner each time. CONSTITUTION: Sheets piles 1 are sent in order along a feeding path 2 by feeding means 6 and 7, to fix two adjoining sheets piles 1a and 1b into the action region of a punching tool 12 at constant intervals (a) by fixing means 8 and 11. Then the rear corner of the preceding sheets pile 1a and the fore corner of the succeeding sheets pile 1b are concurrently punched and cut by a punching tool.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for cutting stacked paper sheets, particularly blocks, into round corners.

Furthermore, the present invention relates to a device for cutting the corners of stacked paper sheets, in particular pro-nks, into round shapes.

It is known to cut the corners of accumulated paper material into round shapes. Namely, Patent Publication No. 1.268 of the Federal Republic of Germany
．． No. 588 discloses a device for cutting round corners of paper material, in which four knives with annular arch-shaped knife blades are aligned in a guillotine-like manner. It acts on the four corners of the stack of paper sheets. in this case,
There is no adjustment of the knife to different sheet sizes. Even if such adjustment were possible, the mutual position of all four knives would change due to the principle of this device, in which the four knives simultaneously cut all four corners of the pile into a round shape. Put it away. Such an arrangement requires considerable adjustment effort and expense, which is further increased when such a device is installed on a machine with a general working mode.

The underlying problem of the invention is to improve the operation of cutting round corners of paper stacks, in particular of blocks. In this case, in particular, for machines with a specific working mode (-a machine with a specific working mode means a machine of a mode in which only one type of work can be carried out at the same time), but also for machines with a general working mode. It is also important to make it easier to adjust the size of machines (a general-purpose work style machine means a machine that can perform various types of work at the same time).

In view of the above, the present invention moves the sheet stack sequentially along the transport path, and maintains the two adjacent sheet stacks at a constant distance from each other in the feeding direction, so that the action of the punching tool is reduced. We propose a method characterized by fixing within a region, and simultaneously cutting the rear corner of the leading stack of paper sheets and the front corner of the trailing stack of paper sheets into a round shape each time. .

Another feature of the method according to the invention is that after cutting the trailing sheet pile into a round shape at its front corner, the length of the trailing sheet stack, viewed in the feed direction, is equal to the distance from the punching tool plus the distance from the punching tool. It means sending it further after the journey.

Another feature of the invention is that the trailing stack of paper sheets is cut into a round shape at its front corners and then held in its oriented state during further feeding.

The features of the equipment for carrying out this method are as follows:
Feed means are provided for feeding the stacks of paper sheets one after another along the feed path, and a constant distance between each preceding stack of paper sheets and the stack of paper sheets coming from behind this stack of paper sheets is provided. Means are provided for forming the spacing and for fixing these stacks of paper sheets at this spacing in the area of action of the punching tool, and that the punching tool in each case simultaneously removes the preceding stack of paper sheets. The holes are spaced apart from each other so that the rear corner and the front corner of the trailing paper stack are punched out.

Another feature of the device according to the invention is that a number of punching tools are each provided in the tool unit in such a way that these punching tools perform simultaneous and identical punching strokes.

According to another embodiment of the invention, two punching tools are provided in the tool unit, one of these punching tools in each case at the rear corner of the preceding sheet pile and at the front of the trailing sheet pile. It is provided so that it acts on the corner of the corner. Two such tool units in each case are also necessary for the feeding of one type of paper stack or for the outer corners of the outer paper stack in a universal operating mode.

Furthermore, in accordance with the embodiment of the invention, if the sheet stacks are of universal size, there are in each case four punching tools in the tool unit, each one of these punching tools being able to mate with two adjacent preceding sheet stacks and two punching tools. It is arranged to act on each one of the mutually opposite corners of adjacent trailing sheet stacks.

According to other configurations according to the present invention: 1. The transport means comprises an infeed conveyor for fresh stacks and a discharge conveyor for finished stacks.

Furthermore, according to the invention, a stop is provided for the respective trailing paper stack, which can be introduced into the feed path of the paper stack. In this case, the stop is designed to be pivotable under control.

Furthermore, according to an embodiment of the invention, tongs are provided on the delivery side which are movable along the feed path, for pulling out a stack of paper sheets in each case at the above-mentioned distance from the trailing stack of paper sheets. . Therefore, the stop and the tongs together form a means for reaching the constant distance between the drawn-out filter stack and the stack of paper sheets following this stack. There is.

In accordance with another embodiment of the invention, for pushing out said stack of paper sheets during the withdrawal of a half-finished stack of paper sheets following a previous stamped and finished stack of paper sheets, The tongs are provided with a belt that can be introduced into the feed channel in a controlled manner.

According to the invention, the tool unit is each provided with a counter-knife whose arrangement corresponds to the arrangement of its individual punching tools.

Furthermore, according to the invention, the tool unit is provided with holding and fastening means for the individual punching tools.

Furthermore, the design according to the invention allows the tool unit to be movable relative to the counter-knife.

In this case, in a further embodiment according to the invention, the tool unit is rigidly connected to a vertical guide rod, which guide rod is guided in a guide in the lower part which accommodates the corresponding counter-knife.

In order to adjust the device to different sizes of paper stacks, according to the invention, the tool unit with its punching tool and the lower part with its counter-knife can be adapted to feed the paper stack for adjustment to other size widths. It is slidable and fixed transversely to the direction.

Furthermore, according to the invention, means are provided for varying the stroke of the tongs as the sheet stack is withdrawn for adjustment to other size lengths.

Furthermore, according to a feature of the invention, drive means for the tool unit are provided for vertical punching interlock.

According to the invention with respect to the abovementioned holding and fixing means for the punching tool, each of the tool units has a tool holder which is provided with a holding electromagnet for the punching tool.

Furthermore, according to the invention additional identification means are provided for fixing the punching tool to the tool holder.

The method and device according to the invention make it possible to produce sheet stacks or blocks with rounded corners with practically little effort and expense. This means that the device can be quickly and easily adjusted to very different sheet sizes.

The invention will now be described in detail with reference to the embodiments illustrated in the accompanying drawings.

As shown in FIG. 1, the sheet stack 1 is moved along the feed path 2 in the direction of the arrow 3. As shown in FIG. In this case, the sheet stack passes through a punching device 4. In this punching device, the corners of the stack of paper sheets are cut into round shapes, that is, punched out into round shapes. The manner in which the feed conveyor 6 rotates for supplying new sheet stacks 1 to the punching device 4 as well as the rotating feed conveyor 6 for discharging finished sheet stacks 1 with rounded corners. Feeding means in the form of a discharge conveyor 7 are provided. The feed conveyor 6 and the discharge conveyor 7 are rollers 6a and 7.
It is designed as a belt which rotates via a to 7e, in which case one of the abovementioned rollers is driven in each case. Swing lever 8a that can be turned in accordance with the two-way arrow 9
A pivotable stop in the feed path 2, which is fixed on the feed path 2, serves for precisely positioning the respective supplied sheet stack 1 in the punching device 4. Furthermore, tongs 11 are provided for drawing the sheet pile 1 into a fixed position in the punching device 4, so that the preceding sheet pile 1a, which is pulled in by the tongs 11, and the stopper 8 prevent the sheet stack from being stopped. A predetermined distance a is formed between the sheet stack 1b and the trailing sheet stack 1b. This distance a corresponds to the distance from the punching tool 12, which is provided in the punching device 4, which will be explained in more detail below, and thus, during the punching process, respectively at the same time the trailing corner of the preceding stack of sheets 1a and the trailing corner. The rear corner of the sheet stack 1b is punched out into a round shape. The tongs 11 are movable along the feed path 2 on the discharge side; for this purpose they are provided with a horizontal longitudinal guide 1
A slider 10 that can be slid on 3 is provided. Tongs 1
1 has a lower jaw 11a and an upper jaw 11b, each of which is mounted on a traverse 15a and 15b extending transversely to the feed direction. Lower traverse 15 with lower jaw 11a
a is firmly connected to the slider lO. Upper jaw 1
1b is movable together with the upper traverse 15b relative to the lower jaw I1a. This relative movement of the upper jaw 11b with respect to the lower jaw 11a causes the tongs 1 to
1 performs opening and closing movements. For this purpose, a pivot lever 14 and a coupling 16, which are pivotably mounted on the slider 10, are provided between the pivot lever 14 and the upper jaw 11b or the upper traverse 15b.

The upper jaw 11b is provided with a strapping member 17.

This banding member can be swiveled in a controlled manner into the feed path 2, so that each time a preceding stack of sheets 1a is withdrawn, it has already been finished, i.e. all four corners are removed. A round, punched sheet stack 1c is pushed out in the feed direction of the delivery conveyor 7 and brought to a delivery speed. Therefore, in order to introduce the banding member 17 into and out of the feed channel 2, the upper jaw 11b of the tongs 11 is pivotable about an axis 21 and is connected to the banding member 17. A lever 19 is provided, which is actuated via a controlled actuating mechanism 18. A toothed belt 26 moving via gear wheels 23, 24 for the above-mentioned longitudinal movement of the tongs 11 in the direction of the double arrow 22.
is provided. This toothed belt upper inversion part 26a
is connected to the lower jaw 11 of the tongs 11 via the connecting member 27.
It is combined with a. Lower inverted portion 26b of toothed heald 26
A longitudinal movement of the tongs 11, i.e. a stalk defined by the size length of its sheet stack 1 and the above-mentioned distance a, is introduced within. For this purpose, the lower reversing part 26b has a slider 29 which is adjusted to this stroke via a coupling member 28.
is combined with

This slider 29 moves toward the guide portion 32 in the direction of the two-way arrow 31.
It is possible to move on the top. The slider 29 is connected via a two-armed lever 34 pivotable about a rotation point 33 to a member 36 which is driven with a constant stroke by a control cam (not shown) and guided on a guide portion 37. There is. By moving the lever rotation point 33 in the direction of the two-way arrow 38 along the track 39, the slider 2
9 stroke, and therefore the stroke of the tongs. This change is necessary when changing the size and length while maintaining the above-mentioned constant distance between the preceding sheet stack 1a and the trailing sheet stack lb. The abovementioned track 39 means, for example, a slidable link guide in which a link prong with a lever rotation point 33 is provided. However, this track 39 can also be an adjusting spindle, on which the guides 30a and 30
An adjusting nut 35 guided on b and having a lever rotation point 33 is movable in the direction of the double arrow 38. The punching device 4 has a vertically movable upper part 4a and a fixed lower part 4b, which accommodates a tool unit 41 formed of a number of punching tools 12. A pull rod 43 actuated by a drive means, for example a drive not shown, via a lever 42 and guided in a stationary guide 44 moves the upper part 4a together with the tool unit 41 in the direction of the lower part 4b; In this case, punching tool 1
The corners lying within the line of action of 2, ie the rear corner of the leading sheet stack 1a and the front corner of the trailing sheet stack 1b, are punched out into round shapes.

In FIGS. 2 to 5, the punching device 4 is shown more clearly with the tool unit 41 present in its upper part 4a and its lower part 4b. In this case the drive means 42, 43 described above are omitted here. In this case, the tool unit 41 shown here is a tool unit used in a general-purpose working mode, and in this case the sheet piles l are conveyed in a number of rows parallel to each other, as shown in FIG. . The movable upper part 4a is provided with a retaining plate 46 which is fixed to the tool unit 71 with a threaded connection 47, as shown in FIGS. 2-4. In this case, the tool unit 41 has a tool holder 48, as shown in FIG. 4, which accommodates the individual punching tools 12, here four punching tools. This tool holder 48 has a notch 49
A punching tool 12 is inserted into this notch. A punching tool 12 is provided in the bottom of this notch 49.
A holding magnet 51 for holding is inserted.

Furthermore, two fastening elements 52 are provided for the additional fastening of two punching tools 12 in each case with the tool holder 48 . This fixing member 52 further includes a fixing screw 53. Holding plate 4 to which the tool unit 41 is fixed
6 is connected via angle profiles 54a and 54b to traverses 56a, 56b oriented transversely to the feed direction (in the direction of arrow 3 in FIG. 1). Depending on the type of work to be carried out, a corresponding number of punching devices 4 with tool units 41 are provided on the traverses 56a, 56b. Moreover, this is done by moving these punching devices 4 along these traverses 56a, 56b by loosening the screw connections 57a and 57b and by tightening and fixing them. Corresponding adjustments to different size widths of the sheet stack 1 are therefore possible in this way. The upper part 4a further comprises guides 58a and 58b, the movable upper part 4a being moved with the fixed lower part 4b during vertical movement (cutting stroke) by means of these chambers. You will be guided. For this purpose there is a suitable vertical royal interior 59a in the lower part 4b.

59b is present. The guide rods 58a, 58b are sealed with dustproof rings 61a, 61b to prevent dust from entering the lower part 4b, thus preventing the royal interior 59
a and 59b are protected from dirt generated as paper fibers when paper is punched. Furthermore, a counterknife 62 for the punching tool 12 is provided in the lower part 4b in an arrangement corresponding to that of the punching tool 12 (FIGS. 1 and 5). During the above-mentioned adjustment of the width to another size, the lower part 4b also slides in the guide parts 63a, 63b in the direction transverse to the feed direction (direction of arrow 3 in FIG. 1) to the same extent as the upper part 4a. be done. For this purpose, corresponding barbed connections 64a, E
i4b (FIG. 5) is loosened and tightened again after sliding the lower part 4b, thus fixing the lower part 4b in its fixed position. The resulting punching chips fall through a hollow chamber 66 located in the center of the interior of the lower part 4b into a receiving chamber 67 located below.

FIG. 6 shows the corresponding arrangement of the supply section and punching device 4 of a general-purpose sheet stack 1 in a schematic plan view. In the five-use working mode illustrated here, FIGS.
Four punching devices 4 of the type shown in the figure are provided, each of which punches simultaneously two adjacent rear corner corners of two preceding sheet stacks 1a as well as two adjacent The trailing paper stack 1b
Adjacent front corners of are cut into a round shape. The other two punching devices 4, each equipped with a tool unit 41 consisting of only two punching tools 12, are used to cut the outer rear corners of the outer leading sheet stack 1a as well as the outer trailing sheet stacks 1a. It is provided to cut the outer front corner of the stack 1b into a round shape.

As already mentioned, adjustment to other size lengths is achieved by changing the tong stroke, and adjustment to other size widths is achieved by sliding the punching tool M4 in the traverses 56a, 56b as well as in the guides 63a, 63b. It is done by letting When adjusting the size width, a tong or a number of tongs 11 are moved correspondingly in the above-mentioned traverses 15a, 15b. The tool unit 41 remains unchanged as such. That is, there is no need to adjust the individual punching tools 12. Therefore, each time the size is adjusted, the distance a between the leading sheet stack 1a and the trailing sheet stack lb as well as the lateral distance between the sheet stacks 1a and 1b are accurately formed. It is important that the corners to be cut into shape lie precisely in the area of action of the punching tool 12 that belongs to them.

[Brief explanation of the drawing]

1 is a simplified diagram of the device according to the invention; FIG. 2 is a partial sectional view of the tool unit together with the cooperating fixed counterknife; Figure 3 is a view corresponding to part 6 is a schematic diagram of the arrangement of multiple tool units in a general-purpose working mode. The symbols in the figure are: 1...paper stack, 1a... preceding paper stack,
1b... Trailing sheet stack, 2... Feeding path, 4a
... Upper part, 4b... Lower part, 6.7... Feeding means, 8.11... Means, 12... Punching tool, 17
...Banding member, 29-39...Means, 41...Tool unit, 48...Tool holder, 51.52.53
...Fixing means, 58a, 58b...Guiding part, 59a
<59b...Guidance part, 62...Counter knife.

Claims (1)

[Scope of Claims] 1. In a method of cutting the corners of stacked sheets, especially blocks, into round shapes, the sheet stack (1) is sequentially moved along the feeding path (2).
) and fixing two stacks of paper sheets (1), each adjoining in the feed direction, in the area of action of the punching tool (12) while maintaining a constant distance (a) from each other; and in each case, the rear corner of the preceding sheet stack (1a) and the front corner of the trailing sheet pile (1b) are cut into round shapes. A method of cutting leaves, especially blocks, into round corners. 2. After cutting the trailing paper stack (1b) into a round shape at its front corner, feed it further through a distance equal to the length of the sheet stack (1b), which is the sum of the distance from the punching tool when viewed in the feeding direction. , the method of claim 1. 3. The method according to claim 1 or 2, wherein the trailing sheet stack (1b) is cut into a round shape at its front corner and then held in an oriented state during further feeding. 4. In a device for cutting the corners of accumulated paper sheets, especially blocks, into round shapes using a cutting tool equipped with an arch-shaped cutting blade, the paper sheet stack (1) is moved along the feeding path (2). A feeding means (6, 7) is provided for sequentially feeding the paper sheets between the preceding paper sheet stack (1a) and the paper sheet stack (1b) coming from behind this sheet pile. for forming a constant spacing (a) as well as these stacks of paper sheets (
1a, 1b) at this spacing (a) in the active area of the punching tool (12), and that the punching tool (12) is in each case preceded simultaneously. A stack of paper, characterized in that the rear corner of the paper sheet stack (1a) and the front corner of the trailing paper sheet stack (1b) are provided at mutual intervals such as punching. A device for cutting the corners of leaves, especially blocks, into round shapes. 5. Device according to claim 4, characterized in that a plurality of punching tools (12) are provided in the tool unit (41) in such a way that these punching tools (12) perform simultaneous and identical punching strokes. . 6. Two punching tools (12) are provided in the tool unit (41), one of these punching tools is inserted into the rear corner of the preceding sheet stack (1a) and the rear corner of the trailing sheet stack (1a), respectively. 6. A device according to claim 4, wherein the device is arranged to act on a front corner of (1b). 7. If the sheet stack (1) is of general size, there are four punching tools (12) in each tool unit (41), each one of which punches two adjacent preceding sheet sheets. 6. The device according to claim 4, wherein the device is arranged to act on each one of the mutually opposite corners of the stack (1a) and of two adjacent trailing sheet stacks (1b). . 8. The feeding means (6, 7) are connected to the feed conveyor (6) for the new sheet pile and the finished sheet pile (1a, 1).
5. The device according to claim 4, comprising a discharge conveyor (7) for b). 9. For each subsequent paper sheet stack (1b),
5. The device as claimed in claim 4, further comprising a stop (8) which can be introduced into the feed channel (2) of the sheet stack (1). 10. Device according to claim 9, characterized in that the stop (8) is configured to be pivotable under control. 11. Tongs (11) movable along the feed path (2) for pulling out in each case one sheet stack (1a) at the above-mentioned distance (a) with respect to the trailing sheet pile (1b); ) is provided on the discharge side.
The device described in any one of the above. 12. A half-finished stack of paper sheets (1c) following the previous stamped and finished stack of paper sheets (1c).
The tongs (11) are provided with a belt carrier (17) which can be introduced in a controlled manner into the feed path (2) for pushing out said stack of paper sheets (1c) during the withdrawal of the paper sheet (1a). 12. The device according to claim 11, wherein: 13. The individual punching tools (
6. Device according to claim 5, characterized in that there is in each case a counter-knife (62) of an arrangement corresponding to the arrangement of 12). 14, the tool unit (41) has individual punching tools (12
) holding and fixing means (48, 51, 52, 53)
6. The device of claim 5, comprising: 15. Claim 5, 13 or 1, wherein the tool unit (41) is movable relative to the counter knife (62).
4. The device according to 4. 16, the tool unit (41) is connected to the vertical guide rod (58
a, 58b), this guide rod is connected firmly to the lower part (4b) which accommodates the corresponding counter knife (62).
16. The device according to claim 15, wherein the device is guided in guides (59a, 59b) of the device. 17. The tool unit (41) is the punching tool (12)
and the lower part (4b) has its counter knife (6
2), as well as a paper stack (
17. The device according to claim 4, wherein the device is slidable and fixable transversely to the feed direction (3) of 1). 18. For adjustment to other size and length, paper sheet stack (1
Claim 4, wherein a) is provided with means (29-39) for varying the stroke of the tongs (11) during withdrawal.
18. The device according to any one of 17 to 17. 19. Device according to any one of claims 4 to 18, characterized in that drive means (42, 43) for the tool unit (41) are provided for performing a vertical punching movement. 20, each of the tool units (41) has a punching tool (12
15. Device according to claim 14, characterized in that it has a tool holder (48) with a holding electromagnet (51) for a tool holder (48). 21. Device according to claim 14 or 20, characterized in that additional fastening means (52, 53) are provided for fastening the punching tool (12) to the tool holder (48).