EP1577239B1 - Feeder for a punching or stamping device - Google Patents

Abstract

The feeder (30) for a stamping or imprinting device (1) has means (20a,20b,21a,21b) for the feed of sheets from a number of piles (16a,16b), whereby the piles are arranged next to one another in the transporting direction (TB). The means for feeding are designed in such a way that even sheets (6a,6b) are fed from a single pile. The means for feeding have at least one suction device per pile. The suction devices can be operated independently from one another. Independent claims are also included for the following: (A) a stamping or imprinting device with the aforesaid feeder; and (B) a method for the stamping or imprinting of sheets by a stamping or imprinting device equipped with the aforesaid feeder.

Description

The invention relates to an investor for a punching or embossing device, as well as a punching or embossing device with such an investor, and a method for punching or embossing of sheets with a stamping or embossing device.

As punching the cutting is referred to as closed, geometric blank forms that can be circular, oval or polygonal as well as fantasy shapes of all kinds. Even the practices practiced in print finishing such as punching with punch, repel corners and register punching are counted to this area. The punching is carried out against a punching pad or against stamp partly it is also shearing operations (cf print finishing, training manual for bookbinders, Bundesverband Druck e.V. 1996, page 351 ff.).

Packaging material made of paper, cardboard, cardboard or corrugated cardboard are mainly punched in sheet format. When punching but also creasing lines or blind embossing can be introduced into the benefit. This complex process makes it indispensable to punch the sheets individually, as the end products are usually sophisticated packaging. For optimum results, stamping tools with the lowest tolerances and extremely precise and reliable punching machines are required.

These stamping machines are often so-called flat bed punches in which the printed sheets stacked on a pallet are fed to the punching machine. The sheets are precisely aligned at three points with side and front marks, taken over by a gripper carriage with a gripper bar and positioned exactly between the die and the punching plate. Here, the complete sheet is punched in a stroke in the next station (breaking station), the waste is mechanically removed by stripping tools. (Stamping and Faltschachtelkleben, solution for further processing, Heidelberger Druckmaschinen AG, 2003).

Such a flat bed punch is for example from the DE 30 44 083 A1 known. The two tables are equipped with cutting and scoring tools or corresponding counter tools with which punched out of the cyclically guided between the table surface sheets the benefits and at the same time pressed the necessary for clean folding grooves. In the subsequent breakout the waste is removed by machine tools. Depending on the equipment of the machine finally the punched benefits can be separated in a designated Nutzentrenneinrichtung.

Most punching and embossing machines process large format products, for example in a format up to 105 x 74 or 100 x 140. To a lesser extent, even small sheet sizes (for example in the format 50 x 70) are processed. Smaller punching or embossing machines are sometimes developed and used for these smaller sheet sizes, or alternatively, when investing in a small format machine that processes small formats on large machines. The latter may be more economical than the purchase of a small format machine, but the economy is still relatively low when a large-format machine is used only for punching or embossing small-sized sheet.

The US 3,391,924 A1 describes a device in which two separate sheets are fed from two adjacent sheet stacks of a printing press. The sheet feeder has suction means to lift and sing single sheets from a respective stack of sheets. Two sheets are simultaneously deducted from the two sheet stacks. The disadvantage of this is that when a sheet stack has to be refilled, the machine must be stopped. This has a negative effect on the production performance of a stamping or embossing device.
It is therefore the object of the present invention to make the stamping or embossing of small-sized sheets with a large-sized punching or embossing device more economical, and to increase the performance of a large-sized punching or embossing device for small sheet sizes.

This object is achieved by means of the inventive investor for a punching or embossing device with the features mentioned in claim 1. Further features emerge from the subclaims.

The feeder according to the invention is thus distinguished by the fact that several stacks are provided next to one another in the transport direction, of which the feeder withdraws sheets by means of suitable means and supplies them to a punching or embossing device. Here, the term investor is quite generally for those device that feeds the punching or embossing device sheet. This inventive investor could also consist of two or more conventional, smaller sized Einzelbogenanlegern parallel to each other operate. For the purposes of the invention, these plurality of single-sheet investors only form a feeder according to the invention, so that such embodiments are likewise encompassed by the invention.

Preferably, the feeder can thereby simultaneously withdraw sheets from several stacks and feed them to the punching and embossing apparatus, although sequential peeling of the sheets from different stacks may also be advantageous, particularly with regard to refilling the stacks from which the feeder withdraws the sheets , Already by the provision of two stacks can be achieved with simultaneous deduction of the sheets from the stacks and feeding the punching or embossing device, a doubling of the throughput of the punching or embossing device, so that high speeds per sheet can be achieved in this way, for example 14 000 sheets per hour. With three or more stacks, from which the investor decreases the bow at the same time, the performance of the punching device increases accordingly. In this way, therefore, the sheet throughput can be increased by the punching or embossing device at the same number of strokes of the punching or embossing device by a multiple.

In the advantageous embodiment of the investor according to the invention, the means for applying at least one separating sucker per stack. Advantageously, this separating sucker per stack is operable independently of the separating suckers of the other stack. In a particularly advantageous embodiment of the punching or embossing device is in the punching or embossing device is a large-sized punching or embossing device and the sheet to small format sheet, in particular a punching and embossing device for a 105 x 74 format and the Sheet by sheet of 50 x 70 format.

In an advantageous embodiment of the investor according to the invention, the means for applying sheets are designed such that even sheets from a single stack can be applied. In this way, the punching or embossing device with the same feeder can also process those products which were originally intended for processing with the punching or embossing device of the corresponding format.

In a further advantageous embodiment of the investor according to the invention, the means for applying at least one independent suction head per stack, for sucking the uppermost sheet of the stack. This allows an investor accordingly Claim 1, which has only a common suction device over the entire feeder width, be further developed.

In a further advantageous embodiment of the investor according to the invention, the means for applying at least each stack to a stack associated with the transport element, in particular at least one conveyor belt. Advantageously, the transport elements per stack to an independent drive. However, it will be apparent to those skilled in the art that a starter with a transport element can be used for all sheets from the various stacks.

In a further advantageous embodiment of the investor according to the invention, the means for applying at least one stack each have a control roller and / or a sheet flap.

In a further advantageous embodiment of the investor according to the invention, the means for applying at least each stack on a side mark, for lateral alignment of the respective sheet. Advantageously, the side marks for aligning each stack also have an independent drive. Furthermore, advantageously, the page marks can be operated in such a way that the respective sheets of all the stacks are aligned laterally at the same time.

In a further advantageous embodiment of the investor according to the invention, the means for applying at least one stack each have a front mark for aligning the front side of the sheet. Advantageously, the front marks for aligning the front of the sheet per stack to an independent drive. Furthermore, advantageously, the front marks can be operated in such a way that the respective sheets of all the stacks are aligned simultaneously.

The invention also relates to a punching or embossing device having a feeder according to the invention with one, several or all previous features. Advantageously, the punching or embossing device gripper on a gripper bar, for transporting the sheet through the punching or embossing device, said gripper and gripper bar are designed such that the grippers are variably attached to the gripper bar. In this way, the rapier can be adapted by means of variably attachable gripper on the plurality of sheets that are applied by juxtaposed stacks. It can also be advantageously achieved in this way that the grippers can assume an ideal positioning with respect to the edges of the sheet. This can prevent the corners of the sheets from bending when punched.

In an advantageous embodiment of the punching or embossing device, the punching or embossing device on Feinjustagemittel, each stack in the feeder are assigned a set of Feinjustagemitteln.

Fig. 1

den prinzipiellen Aufbau einer Bogenstanz- und Prägemaschine,

Fig. 2

eine Draufsicht einer Ausführungsform eines erfindungsgemäßen Anlegers

Fig. 3

eine Vorderansicht einer Ausführungsform eines erfindungsgemäßen Anlegers

Fig. 4

eine Vorderansicht einer weiteren Ausführungsform eines erfindungsgemäßen Anlegers

In a further advantageous embodiment of the stamping or embossing device, the punching or embossing device comprises a pre-stacking device, which is designed such that it is suitable for producing a plurality of aligned stacks on a pallet. Preferred embodiments of the device according to the invention are described in detail below with reference to the drawings. In a schematic representation:

Fig. 1

the basic structure of a sheet punching and embossing machine,

Fig. 2

a plan view of an embodiment of an investor according to the invention

Fig. 3

a front view of an embodiment of an investor according to the invention

Fig. 4

a front view of another embodiment of an investor according to the invention

FIG. 1 shows a schematic representation of a known punching or embossing device 1. Here, as well as in the following figures, are generally known and required to operate the device drive and guide means, cams and control means to illustrate the effects of the device is not shown or only described in general terms.

In FIG. 1 the basic structure of a sheet punching and embossing machine 1 for punching, breaking and depositing sheets of paper, cardboard and the like is shown. The punching and embossing machine 1 consists of a punching device 2, a breakout device 3 and a depositing device 4, which are supported and enclosed by a common machine housing 5.

The sheet 6 are gripped by mounted on revolving chains 7 rapiers 8 at its front edge and intermittently pulled through the various stations 2, 3 and 4 of the punching and embossing machine 1.

The punching station 2 includes a device consisting of a lower table 9 and an upper table 10. The lower table 9 is fixedly mounted in the machine frame and provided with a counter plate to the punching knife. The upper table 10 is mounted vertically movable and driven by a drive for the device.

The gripper bar 8 transports the sheet 6 from the punching and embossing station 2 in the subsequent breaking station 3, which may be equipped with breakout tools. In the breaking station 3 are pushed out of the sheet with the help of the break-off tools the unnecessary pieces of waste from the sheet, whereby these waste pieces 11 fall into a container-like carriage 12 inserted below the station.

From the breaking station 3, the sheet 6 passes into the depositing station 4, where the sheet is either simply stored, or cheaper at the same time a separation of the individual benefits. The depositing station 4 can also contain a pallet 13, on which the individual sheets are stacked in the form of a stack 14, so that after reaching a certain stack height, the pallets with the stacked sheets 14 can be moved away from the area of the punching and embossing machine 1.

As can be seen, the chains 7 carry a plurality of gripper bars 8, for example, there are eight, so that multiple sheets 6 can be processed simultaneously in the various stations 2, 3 and 4.

In FIG. 1 and in FIG. 2 is the transport movement of the sheet 6, 6a, 6b represented by the punching and embossing device 1 by the arrow with the reference TB. In the in FIG. 2 shown embodiment of the device according to the invention, a first stack 16a and next to a second stack 16b are shown in the feeder 30. The two stacks 16a, 16b are shown symmetrically to the center line M of feeder 30 and punching or embossing device 1. However, it will be apparent to those skilled in the art that, if desired, he may also choose a non-symmetrical arrangement of the stacks 16a, 16b, for example if the two stacks 16a, 16b have different formats. Incidentally, here is meant by feeder 30 a device which supplies the punching or embossing device 1 sheet 6, 6a, 6b. This inventive feeder could also consist of two or more conventional, smaller sized Einzelbogenanlegern operated in parallel. For the purposes of the invention, however, this only means an inventive feeder 30, so that such embodiments are likewise encompassed by the invention.

As in FIG. 3 and FIG. 4 Suction heads 42a, 42b are arranged at the upper end of the stack 16a, 16b. These suction heads 42a, 42b are connected to a suction device 40, 40a, 40b. It may be in one embodiment, as in FIG. 3 shown to act as a common suction device 40 or, as in the embodiment in FIG. 4 shown to each have a suction device 40a, 40b, which is associated with the corresponding stack. In the embodiment in FIG. 3 For example, the suction heads 42a, 42b may be connected to the suction device 40 such that the suction heads 42a, 42b are supplied with suction air independently of each other. The suction device 40, 40a, 40b generates at the suction heads 42a, 42b a suitable cycled negative pressure, so that the suction heads 42a, 42b can grip the uppermost sheets 6a, 6b of the stacks 16a, 16b and feed them to a transport device 20a, 20b. In the embodiments of the FIGS. 3 and 4 each stack 16a, 16b are each associated with 2 suction heads 42a, 42b. However, it will be apparent to one skilled in the art that he may also use a different number of suction heads 42a, 42b about one or three or more per stack.

Above the stacks 16a, 16b, clock rollers 32 are arranged. These clock rollers 32 generate a scale flow of the sheets 6, 6a, 6b in the direction of the transport movement TB to the punching or embossing device 1. The scale flow of the sheets 6, 6a, 6b is moved forward by pairs of conveyor belts 20. The pairs of conveyor belts are advantageously driven separately in batches. However, it can also be provided that the conveyor belts 20, which are assigned to the respective stacks 16a, 16b, synchronize with each other by mechanical or electronic means.

At the entrance of the punching or embossing device 1 are side marks 21a, 21b and not shown, known to those skilled in front brands for lateral alignment and orientation of the front of the sheet 6a, 6b. In one embodiment, the side marks 21a, 21b and front marks, respectively, are associated with the respective stacks 16a, 16b so as to independently align the respective sheets 6a, 6b. However, in a preferred embodiment, the alignment takes place simultaneously for all the sheets which are to be punched together in the following.

After the sheets 6a, 6b have been aligned, they are gripped by grippers 18a, 18b attached to a rapier bar 8. The grippers 18a, 18b are slidably mounted on the gripper bar 8, so that the position of the grippers 18a, 18b relative to the sheets 6a, 6b can be adjusted, so that a suitable adaptation to the format and number of simultaneously processed sheet 6a, 6b is possible.

In a preferred embodiment of the punching or embossing device 1, the punching or embossing device 1 comprises a stacking device, not shown, which generates the required number of stacks 16a, 16b on a pallet, which can then find application in the feeder 30.

List of reference numbers:

1

Punching and embossing device

2

Punching and embossing station

3

stripping

4

deposit station

5

machine housing

6

bow

6a, b

bow

7

Chain

8th

gripper bar

9

under table

10

overtable

11

trimmings

12

container-type trolley

13

palette

14

stacked sheets

16a, b

stack

18a, b

grab

20a, b

conveyor belt

21a, b

page brand

30

investor

32

synchronizing roller

40

suction

40a, b

suction

42a, b

suction head

TB

transport movement

M

center line

Claims (14)

1. Large-format diecutting or stamping device (1) for processing small-format sheets (6, 6a, 6b), the diecutting or stamping device (1) including a feeder (30) with feeding means (20a, 20b, 21a, 21b, 30, 32, 40, 40a, 40b, 42a, 42b) for feeding sheets (6, 6a, 6b) from a plurality of stacks (16a, 16b) arranged parallel to each other, adjacent to each other, and parallel to the direction of transport (TB),
   characterized by
   the fact that the feeding means (20a, 20b, 21a, 21b, 30, 32, 40, 40a, 40b, 42a, 42b) include at least one suction device (40, 40a, 40b) per stack (16a, 16b) and that the at least one suction device (40, 40b) of a stack (16a) is operatable independently of the at least one respective suction device (40, 40b) of the other stacks (16b).
2. Diecutting or stamping device (1) according to Claim 1,
   characterized by
   the fact that the feeding means (20a, 20b, 21a, 21b, 30, 32, 40, 40a, 40b, 42a, 42b) are designed in such a way that it is possible to feed sheets (6, 6a, 6b) from a single stack (16a, 16b).
3. Diecutting or stamping device (1) according to any one of Claims 1 to 2,
   characterized by
   the fact that the feeding means (20a, 20b, 21a, 21b, 30, 32, 40, 40a, 40b, 42a, 42b) include at least one independent suction head (42a, 42b) per stack (16a, 16b) for picking up the uppermost sheet (6a, 6b) in the stack (16a, 16b) by suction.
4. Diecutting or stamping device (1) according to any one of Claims 1 to 3,
   characterized by
   the fact that the feeding means (20a, 20b, 21a, 21b, 30, 32, 40, 40a, 40b, 42a, 42b) include at least one transport element (20a, 20b) per stack (16a, 16b), in particular at least one transport belt (20a, 20b).
5. Diecutting or stamping device (1) according to Claim 4,
   characterized by
   the fact that the transport element (20a, 20b) includes an independent drive per stack (16a, 16b).
6. Diecutting or stamping device (1) according to any one of Claims 1 to 5,
   characterized by
   the fact that the feeding means (20a, 20b, 21a, 21b, 30, 32, 40, 40a, 40b, 42a, 42b) include at least one intermittently operated roller (32) per stack (16a, 16b).
7. Diecutting or stamping device (1) according to any one of Claims 1 to 6,
   characterized by
   the fact that the feeding means (20a, 20b, 21a, 21b, 30, 32, 40, 40a, 40b, 42a, 42b) include at least one sheet flap per stack (16a, 16b).
8. Diecutting or stamping device (1) according to any one of Claims 1 to 7,
   characterized by
   the fact that the feeding means (20a, 20b, 21a, 21b, 30, 32, 40, 40a, 40b, 42a, 42b) include at least one lateral lay (21a, 21b) per stack (16a, 16b) for the lateral alignment of the respective sheets (6, 6a, 6b).
9. Diecutting or stamping device (1) according to Claim 8,
   characterized by
   the fact that the lateral lays (21a, 21b) for the lateral alignment include an independent drive per stack (16a, 16b).
10. Diecutting or stamping device (1) according to any one of Claims 8 to 9,
    characterized by
    the fact that the lateral lays (21a, 21b) of all stacks (16a, 16b) align the respective sheets (6, 6a, 6b) simultaneously.
11. Diecutting or stamping device (1) according to any one of Claims 8 to 10,
    characterized by
    the fact that the feeding means (20a, 20b, 21a, 21b, 30, 32, 40, 40a, 40b, 42a, 42b) include at least one front lay per stack (16a, 16b) for aligning the front side of the sheets (6, 6a, 6b).
12. Diecutting or stamping device (1) according to Claim 1,
    characterized by
    the fact that the diecutting or stamping device (1) includes grippers (18a, 18b) on a gripper bar (8) for transporting the sheets (6, 6a, 6b) through the diecutting or embossing device (1), the grippers (18a, 18b) and gripper bar (8) being designed in such a way that the grippers (18a, 18b) are mountable on the gripper bar (8) in a variable way.
13. Diecutting or stamping device (1) according to Claim 12,
    characterized by
    the fact that the diecutting or stamping device (1) includes fine adjustment means, each stack (16a, 16b) being assigned a set of fine adjustment means.
14. Diecutting or stamping device (1) according to any one of Claims 12 to 13,
    characterized by
    the fact that the diecutting or stamping device (1) comprises a pre-stacking device which is designed to be suitable for creating multiple aligned stacks (16a, 16b) on a pallet.

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