EP2452790B1 - Processing station for a stamping machine and method for removing a test blank - Google Patents

Description

The invention relates to a storage and pay station according to the preamble of claim 1, a sheet punching and / or embossing machine according to claim 9 and a method for depositing intermediate sheets according to claim 10.

State of the art

As punching the cutting is referred to with closed geometric blank forms that can be circular, oval or polygonal and imaginary shapes of all kinds. Also the practices practiced in print finishing, such as punching with punch, corner punching and register punching are counted to this area. The punching takes place against a punching pad or against stamp, in some cases it is also shearing operations. Packaging materials made of paper, cardboard, cardboard or corrugated board 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. Since the end products are sophisticated packaging in terms of technical and graphic design (such as packaging for cosmetics, cigarettes, pharmacy, food, etc.), special requirements are not only placed on the packaging materials themselves, but are also punching tools for optimum results required with the smallest tolerances and extremely precise and reliable punching machines. Flatbed punching best meets these demands. The printed sheets stacked on a pallet are fed to the punching machine. In the machine, the sheets to be punched are precisely aligned in an alignment device, taken over by a gripper carriage and positioned exactly in the punching device between a fixed undercounter and a vertical over a knee lever or eccentric upper table.

In known sheet punching and embossing machines, which are used for punching, embossing, breaking, if necessary. Nutzentrennen and storing sheets of paper, cardboard and the same, it is known to move the sheets by means of gripper carriage through the individual stations of the machine. A respective gripper carriage has a gripper bridge, to which grippers are fixed, which grasp the arches at a front end. A gripper carriage further has lateral carriages, which are connected to endless chains of the transport system and whereby the gripper carriage to be moved by the machine. By this type of movement of the sheets through the machine, a continuous work in the individual successively arranged stations of the machine, in particular punching, break-away and Nutzentrennstation allows.

Such a flat bed punch is for example from the DE 30 44 083 A1 , of the US 7,658,378 B2 and the EP 1 914 050 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.

In order to assess the quality of the punching process, the machine operator needs a so-called test sheet. In this sample sheet, although the punching should be done, but it should at least no separation into individual benefits have taken place. If necessary, the breaking-out process, in which waste is broken out of the punched sheet, should also be prevented. This allows the machine operator to judge all the punching lines by means of a complete, complete sheet.

In order to obtain a sample sheet, the punching machine must be temporarily switched off in the above-described punching machines. This makes it possible to remove a punched sheet before it is subsequently processed further in the stripping station and the depaneling station.

A disadvantage of this procedure is that the productivity is reduced by switching off and the subsequent startup of the punching machine.

Also known are other types of punching machines, in particular manufactured by the company Bobst, which allow to take a sample sheet without having to stop the punching machine. This is made possible by the fact that the drive of the breaking station as well as the Nutzentrennstation is disconnected from the main drive of the processing stations in the short term.

A disadvantage of this procedure is that by decoupling the masses of the drives of Nutzentrennstation and Ausbrechstation a momentum shock is introduced into the main drive system, causing a vibration excitation of the main drive system.

Object of the present invention is therefore to provide a processing station and a punching machine with such a processing station, which does not have to be disconnected to remove a sample sheet, or learns a vibration input by coupling individual drive trains. Another object is to describe a method for discharging and depositing a sample sheet, which avoids the disadvantages of the prior art described above.

This object is achieved by a processing station with the characterizing features of claim 1, by a sheet punching and / or embossing machine according to claim 9 and by a method for discharging and depositing sample sheet according to claim 10.

The inventive processing station for a flatbed sheet punching and / or embossing machine has a sheet transport system for transporting the sheets through the processing station as well as a lifting upper tool, which cooperates with a lower tool. The lower tool can in particular be stationary. If the processing station is a breakout station for breaking out of waste from bow, so upper tool and lower tool are designed as stripping. If the processing station is a blanking and depositing station for depositing a single use of a sheet on a stack, the upper tool and lower tool are designed as a blanking tool. According to the invention, the upper tool has a tool holder and a lifting tool, which is held by the tool holder. The distance between the lifting tool and the tool holder is variable. This change in distance occurs in a particularly advantageous and therefore preferred embodiment by a lifting movement, in particular a pure vertical movement, of the lifting tool. In other words: The lifting tool is raised.

This makes it possible in an advantageous manner that even if a sample sheet is to be removed, the drive of the processing station can remain coupled to the main drive of all processing stations of the punching machine. Exactly at the time at which a sheet which is to be designed as a test sheet passes through the processing station, the distance between the lifting tool and the tool holder is reduced so far by a lifting movement that the lifting tool causes no processing of the sample sheet in the course of its normal working cycle and the sample sheet below the lifting tool can pass unprocessed. Thus, it is achieved that a test sheet does not undergo any machining by upper tool and lower tool, while the flat-bed sheet punching and / or embossing machine as a higher-level system of the processing station, however, does not have to be switched off.

In a particularly advantageous embodiment, the lifting tool is connected by at least one actuator with the tool holder, wherein the at least one actuator causes the change in distance. In particular, four actuators may be provided, namely one actuator each at a respective corner of the lifting tool. In a preferred embodiment, the at least one actuator is designed as a pneumatic cylinder, as this allows for a short switching times and on the other tolerates vibrations and shocks during the lifting movements of the upper tool.

In an advantageous development, the processing station has a test sheet display, which may be formed, for example, as a cassette or drip tray. This can be arranged in particular below the sheet transport system of the processing station, so that a respective sample sheet can be transported from the sheet transport system to the test sheet delivery and released there. This allows the operator to easily remove the sample sheet.

In an advantageous development of the processing station according to the invention, the latter has a control unit which controls the at least one actuator by using a number of test sheets, the sheet transport speed and, if applicable, the machine cycle predetermined by the machine operator. Thus, the at least one actuator is then actuated taking into account the working cycle and the required actuating speed when a sample sheet is to pass through the processing station unprocessed. This control unit can be integrated in particular in the control unit of a higher-level punching machine.

The invention also relates to a sheet punching and / or embossing machine for punching and / or embossing sheets of paper, cardboard, plastic and the like with a sheet transport system, with a feeder, with a punching and / or embossing station and at least one further processing station, in particular a stripping station and a boom, wherein at least the boom is designed according to the above description of the processing station according to the invention. However, it is particularly advantageous if both breaking station and boom have the embodiment according to the invention, since such a test sheet can be designed, which has experienced only the punching process in terms of sheet processing.

The invention also relates to a method for discharging and depositing a sample sheet in a test sheet delivery of a sheet punching and / or embossing machine, wherein this particular, as described above, with at least one punching station and at least one further processing station, which in particular as described above, the method comprising the following steps:

In a first step, a sheet is fed into the sheet punching machine, the sheet is transported by a transport device through the machine and there is a processing of the sheet at least by the at least one punching station. In a second step, the lifting tool of the upper tool of at least one of the processing stations, namely at least one Nutzentrenn- and depositing station - also referred to as boom - spent by lifting in a non-operative position. Even if the upper tool carries out its working stroke stroke movement, it causes no processing of the sample sheet in this non-action position. Therefore, the sample sheet can be transported in a next step in the sample sheet delivery. Subsequently, the lifting tool can be lowered back into its working position, so that subsequent sheets are processed again regularly by the lifting tool.

By a slightly modified method, a plurality of sample sheets can be discharged. For this purpose, after lifting and before lowering again the lifting tool several sheets processed in the punching station and transported to the test sheet delivery.

The described invention and the described advantageous developments of the invention are also in any combination with each other advantageous developments of the invention.

With regard to further advantageous embodiments of the invention, reference is made to the dependent claims and the description of an embodiment with reference to the accompanying drawings.

embodiment

Fig 1.

eine erfindungsgemäße Bogenstanz- und/oder -prägemaschine in einer Übersichtsdarstellung

Fig. 2a

eine Bearbeitungsstation zu einer ersten Momentaufnahme

Fig. 2b

die Bearbeitungsstation zu einer zweiten Momentaufnahme

Fig. 3a

eine erfindungsgemäße Bearbeitungsstation zu einer ersten Momentaufnahme

Fig. 3b

die erfindungsgemäße Bearbeitungsstation zu einer zweiten Momentaufnahme während dem Ausschleusen eines Probebogens

The invention will be explained in more detail with reference to an embodiment. It show in a schematic representation

Fig. 1

an inventive sheet punching and / or embossing machine in an overview

Fig. 2a

a workstation to a first snapshot

Fig. 2b

the workstation to a second snapshot

Fig. 3a

a processing station according to the invention to a first snapshot

Fig. 3b

the processing station according to the invention to a second snapshot during the discharge of a sample sheet

In FIG. 1 the basic structure of a sheet punching and embossing machine 100 for punching, breaking, Nutzentrennen and storing sheets of paper, cardboard, plastic and the like is shown. The punching and embossing machine 100 has a feeder 1, a punching station 2, a breaking station 3 and a boom 4 with storage and pay station, which are supported and enclosed by a common machine housing 5 and driven by a main drive 17. From one side, the so-called operator side, the processing stations 2, 3, 4 are accessible; on the opposite side, the so-called drive side, there is the drive train of the sheet punching and embossing machine 100. A machine control 15 controls the processes within the punching machine 100.

The sheets 6 are separated by a feeder 1 from a stack, fed to the sheet transport system 7 and gripped by gripper bars of a gripper carriage 8 grippers at its front edge and intermittently in the sheet transport direction B through the various stations 2, 3 and 4 of the punching and embossing machine 100th pulled.

The sheet transport system 7 has a plurality of gripper carriages 8, so that a plurality of sheets 6 can be processed simultaneously in the various stations 2, 3 and 4. The gripper carriage 8 can be driven by a chain drive or in an alternative embodiment by an electromagnetic linear drive with traveling wave motors, such as in the DE 20 2007 012 349 U1 described.

The punching station 2 consists of a lower crucible, a so-called. Subtable 9, and an upper crucible, a so-called. Obertisch 10. The upper table 10 is vertically back and stored movable and provided with punching and Rillmessern. The lower table 9 is fixedly mounted in the machine frame and provided with a counter plate to the punching and Rillmessern. Alternatively, the upper table 10 fixed and the lower table 9 may be moved. In embossing, embossing tools, in particular in the form of so-called embossing dies, are used instead of the punching and scoring tools.

The gripper carriage 8 transports the sheet 6 from the punching and embossing station 2 in the subsequent breaking station 3, which is equipped with breakout tools 21, 23. In the breaking station 3, the waste pieces 11 which are not required are pushed out of the sheet 6 downward with the aid of the breaking-out tools 21, 23, whereby the waste pieces 11 fall into a carriage-like container 12 inserted below the station.

From the stripping station 3, the sheet 6 passes into the boom 4, where the sheet 6.1 is either simply stored, or at the same time a separation of the individual 6.2 uses a respective sheet 6. For this purpose, the boom 4 has a blanking tool 21, 23. The boom 4 may also include a pallet 13, on which the individual sheets 6 or 6.2 utility stacked in the form of a stack 14, so that after reaching a certain stack height, the pallet 13 with the sheet stack 14 can be moved away from the area of the punching and embossing machine 100.

The FIGS. 2a and 2 B show the processing operation of a sheet 6 in a processing station 3, 4 using the example of the Nutzentrenn- and storage station 4 in a detailed view. How out Fig. 2a As can be seen, a sheet 6 was transported by the gripper carriage 8 of the sheet transport system 7 in the sheet transport direction B to below the stamped 22 upper tool 21. Below the sheet 6 is a Nutzentrenngitter as lower tool 23, which is received in a removable frame 24. As in Fig. 2b illustrated, the lifting tool 21.1 undergoes a stroke h, which separates the individual benefits 6.2 of the sheet 6 from each other and stores on a stack 14. To do so, the punches 22 of the blanking tool 21.1 dip into the sheet transport plane E with an immersion depth t.

If now a test sheet 6.1 the processing station 3, 4 happen without the sample sheet 6.1 undergoes a processing by the tools 21, 23, it is ensured according to the invention that the upper tool 21 is not dipped into the sheet transport plane E during its stroke stroke stroke. This is based on the FIGS. 3a and 3b explains:

As in Fig. 3a illustrated, the upper tool 21 - shown here on the example of a Nutzentrennwerkzeugs - a tool holder 21.2, which serves to receive the lifting tool, namely the Nutzentrennwerkzeugs 21.1. The blanking tool 21.1 is connected by actuators, which are designed as pneumatic cylinders, with the tool holder 21.2. The actuators 26 can perform an adjusting movement which causes a change in distance a between the tool holder 21.2 and the lifting tool 21.1. For processing a sheet 6, not shown here, the upper tool 21 performs a lifting movement h. The upper tool 21 is guided during its lifting movement by means of guides 4.2. The lifting movement h is impressed on the upper tool 21 by a drive 4.1. The drive 4.1 can be connected by a - not shown here - gear train with the machine drive 17 of the sheet punching and embossing machine 100. In order to effect the processing of a sheet 6, here its Nutzentrennung, the upper tool 21 performs a stroke of the size H in each machine cycle, the punch 22 in the sheet transport plane E immerse (immersion depth t).

As in Fig. 3b As this is not to be processed by the tools 21, 23, but by the gripper carriage 8 of the sheet transport system 7, is to be transported to the sample sheet delivery 25 on, was of the actuators 26 of the Distance between the tool holder 21.2 and the lifting tool 21.1 substantially reduced (a). While the lifting tool 21 in the snapshot of Fig. 3a is at its highest point, the lifting tool 21 is in the snapshot of Fig. 3b in its lowest point. That is, it has already carried out its clockwise stroke H and still located above the sample sheet 6.1, so that it is ensured that it is not processed by the upper tool 21. The sample sheet 6.1 can therefore be transported without further processing in the processing station 3, 4, in the test sheet delivery.

A breaking station 3 can analogously in the FIGS. 3a and 3b illustrated Nutzentrenn- and storage station 4 may be formed. Breakout tools used in stripping stations are well known to those skilled in the art. Instead of the Nutzentrennstempel 22 has the lifting tool 21.1 of the stripping tool punches for breaking waste 11 from the sheet 6. It is crucial that the distance between the tool holder 21.2 and the stripping 21.1 changed, that is reduced, so that a sample sheet 6.1 no breaking his waste pieces 11 learns. Instead of the Nutzentrenngitters comes as a lower tool 24 a breaking board used. In addition, a lying below the stripping board, stroke-driven counter tool can be used with Ausbrechstiften, the Ausbrechstifte grab a respective piece of waste from below and ensure its removal. In order to avoid damaging the underside of the test sheet 6.1 by the lower break-off pins, it may be necessary to lower the counter-tool during the test sheet ejection. This can be done advantageously analogous to the lifting of the upper tool described above.

LIST OF REFERENCE NUMBERS

1

investor

2

Punching and / or embossing station

3

stripping

4

boom

4.1

drive

4.2

Guide upper tool

5

machine housing

6

bow

6.1

test sheet

6.2

Use

7

Sheet transport system

8th

gripper carriages

9

under table

10

overtable

11

trimmings

12

dare

13

palette

14

delivery pile

15

Control with interface and input devices

16

feed

17

machine drive

19

Counter tool (lifting stripping pins)

21

Upper tool with punches

21.1

Blanking tool or stripping tool (lifting tool)

21.2

tool holder

22

stamp

23

Dividing grille or stripping board (lower tool)

24

Removable frame for holding a dividing grille or the lower tool with break-out board

25

Sample sheet delivery

26

Actuator (pneumatic cylinder)

100

Sheet punching and embossing machine

B

Sheet transport direction

e

Sheet transport plane

H

stroke

a

Distance change by lifting movement

H

Lifting movement of upper tool

t

Immersion depth

Claims (11)

1. Processing station (3, 4) for a sheet-fed flat-bed diecutting and/or embossing/stamping machine (100) for stripping waste (11) off sheets (6) or for delivering individual blanks (6.2) of a sheet (6) on a stack (14) and for delivering sample sheets (6.1),
   including a sheet transporting system (7), an upper tool (21) driven to move up and down by a drive (4.1) and a lower tool (23) co-operating with the former to strip off waste (11) or to separate blanks (6.2),
   characterized in
   that the upper tool (21) includes a tool mount (21.2) and a lifting tool (21.1), wherein the distance between the lifting tool (21.1) and the tool mount (21.2) is changeable (a).
2. Processing station (3, 4) according to claim 1,
   characterized in
   that the distance change is effected by a lifting movement (a) of the lifting tool (21.1).
3. Processing station (3, 4) according to one of the preceding claims,
   characterized in
   that the lifting tool (21.1) is connected to the tool mount (21.2) by at least one actuator (26) and that the at least one actuator (26) effects the distance change (a).
4. Processing station (3, 4) according to claim 3,
   characterized in
   that the at least one actuator is a pneumatic cylinder (26).
5. Processing station (3, 4) according to one of the preceding claims,
   characterized in
   that the processing station (4) has a sample sheet delivery (25).
6. Processing station (3, 4) according to one of claims 3 to 5,
   characterized in
   that the processing station (3, 4) includes a control unit (15), which controls the at least one actuator (26) making use of a predetermined number of sample sheets (6.3), the sheet transport speed and/or the machine cycle.
7. Processing station (3, 4) according to one of the preceding claims,
   characterized in
   that the processing station (3, 4) is a stripping station (3) having a stripping tool (21,23).
8. Processing station (3, 4) according to one of claims 1 to 6,
   characterized in
   that the processing station (3, 4) is a blank separation and delivery station (4) including a blank separating tool (21, 23).
9. Sheet-fed diecutting and/or embossing/stamping machine (100) for diecutting and/or embossing/stamping sheets (6) of paper, cardboard, synthetic materials and the like, including a sheet transporting system (7), a delivery (1), a diecutting and/or embossing/stamping station (2), at least one further processing station (3, 4), in particular a stripping station (3) and a delivery (4), wherein at least the delivery (4) is designed in accordance with one of the preceding claims.
10. Method for ejecting and delivering at least one sample sheet (6.1) in a sample sheet delivery (25) of a sheet-fed diecutting and/or embossing/stamping machine (100), in particular according to Claim 7, including at least one diecutting station (2) and at least one further processing station (3, 4), in particular according to one of claims 1 to 8, characterized by the following steps:

    a) feeding a sheet (6.1) into the sheet-fed diecutting and/or embossing/stamping machine (100), transporting the sheet (6.1) by means of a transport device (7) and processing the sheet (6.1) at least by means of the diecutting station (2)

    b) lifting the lifting tool (21.1) of the upper tool (21) of at least one of the processing stations (3, 4) into an ineffective position

    c) transporting the sheet (6.1) into a sample sheet delivery (25)

    d) lowering the lifting tool (21.1) of at least one of the processing stations (3,4) into its working position
11. Method according to claim 10 for ejecting and delivering a plurality n of sample sheets (6.1),
    characterized by
    the following additional step c') between steps c) and d):

    c') repeating steps a) and c) with n-1 further sheets (6.1)

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