EP2554345B1 - Sheet stamping and/or embossing station with closing frame that is operated using compressed air - Google Patents

Description

The invention relates to a sheet punching and / or embossing station according to the preamble of claim 1 and a system comprising a flat bed sheet punching machine and a compressed air gun according to claim 9.

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. Plastic, film, paper, cardboard, cardboard or corrugated board packaging materials are mainly stamped 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 and the US 7,658,378 B2 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.

From the DE 195 16 073 A1 a device for a sheet punching and embossing machine is known. In the described mounting frame of the device, the support plate is clamped by means of adjusting and retaining screws and roughly aligned. The fine adjustment then takes place via the adjustment of stops in the mounting frame of the support plate. For clamping, aligning and subsequent fine adjustment, an operator must manually tighten the adjustment and holding screws and also manually adjust the mounting frame until the support plate is clamped exactly aligned in the device. The disadvantage of this is the time-consuming locking by means of screwing.

Also known is the use of eccentric frames, which clamp the tool by rotating eccentrics. The disadvantage of this is that the tools are stretched unevenly.

The US 7,329,220 B2 shows a sheet punching and embossing machine with a device for punching benefits from sheets, with a frame for receiving a equipped with punching and grooved blades support plate which is clamped in the frame by means of hydraulically operated clamping elements, wherein the hydraulic pressure for clamping in the hydraulic system is constructed by a piston which is supported by a mechanical spring.

A disadvantage of the use of hydraulics is that a complex sealing of the hydraulic lines is required. This is particularly difficult because of the lifting movement of the tool. If leakage occurs and the sheet punching and embossing machine produces products for the food industry, the products can not be used even with only minor contamination.

task

Object of the present invention is to provide a Bogenstanz- and / or -prägestation which allows a simple construction and ease of use secure clamping a punching and / or embossing tool and thereby avoids the disadvantages of the known from the prior art clamping devices.

This object is achieved by a sheet punching and / or -prägestation with the features of claim 1. The sheet punching and / or -prägestation invention for a flat-bed sheet punching machine with an upper crucible and a lower crucible, wherein one of the two crucibles is moved , Has a closing frame, which is connected to the upper crucible, and holds a punching and / or embossing tool. For processing sheets of paper, cardboard, plastic and the like by the Bogenstanz- and / or -prägestation a respective sheet is moved through in a sheet transport direction between the crucibles. According to the invention, the closing frame has a spring clamping device, for example with spiral compression springs, for permanent clamping of the punching and / or embossing tool and furthermore a pneumatic device for canceling the clamping of the punching and / or embossing tool. Advantageously, the pneumatic device has one of outside the sheet punching and / or embossing station accessible compressed air supply inlet for temporary supply of compressed air. This has the advantage that only a force must be applied from the outside when the clamping of the tool is to be canceled. Another advantage is that the use of compressed air, in contrast to a hydraulic fluid is not critical with respect to the processing of food packaging. The sheet punching and / or -prägestation invention has no permanent compressed air supply, but on the compressed air supply input only a short time compressed air is supplied, which then acts in the pneumatic device. Advantageously, thus - in the case of the moving upper crucible - no compressed air supply lines are required, which join the lifting movement of the tool. This allows a simpler and less expensive construction of the sheet punching and / or embossing station.

In an advantageous embodiment of the sheet punching and / or embossing station according to the invention is a respective spring clamping device, each with at least pneumatic, e.g. a pneumatic cylinder or a piston-free pneumatic drive such as a pneumatic rail - hereinafter referred to briefly as a pneumatic cylinder - in an operative connection, wherein a respective pneumatic cylinder is part of the pneumatic device. The respective at least one pneumatic cylinder can thus counteract the spring force of the spring clamping device, so that the clamping of the tool can be canceled.

In a particularly advantageous development of the station according to the invention, the closing frame has at least one first spring clamping device for clamping the punching and / or embossing tool in the sheet transport direction and at least one second spring clamping device for clamping the punching and / or embossing tool perpendicular to the sheet transport direction. The at least first and at least second spring clamping device is assigned in each case one connected to the compressed air supply inlet air duct. In other words, a respective air channel connects the compressed air supply input to the pneumatic cylinders associated with a respective first and second spring clamping device. Since each spring clamp is connected to the compressed air supply input, in Advantageously, by applying compressed air, the clamping of the tool quickly solved and the handling when changing tools are kept simple.

In an advantageous embodiment, each air duct has a check valve. As a result, the pressure in the air ducts and the pneumatic cylinders is maintained.

In an advantageous embodiment, each air duct has a controllable throttle valve connected to the environment for reducing the pressure in the respective air duct. This has the advantage that thereby the clamping force on the tool perpendicular to the sheet transport direction, d. H. in the lateral direction, and in the sheet transport direction, d. H. in the circumferential direction, can be effective and a distortion in the sense of deforming the tool or the closing frame is prevented.

In a further embodiment, the closing frame of the sheet punching and / or embossing station has mechanical adjusting elements, in particular adjusting screws for additional adjustment of the punching and / or embossing tool in the closing frame. As a result, already distorted in their geometry tools can be manipulated and readjusted.

In a further advantageous embodiment variant, the closing frame of the sheet punching and / or embossing station has a centering element for centering the punching and / or embossing tool in the sense of aligning the tool perpendicular to the sheet transport direction.

The invention also relates to a system comprising a flatbed sheet punching machine with a sheet punching and / or embossing station as described above and further a compressed air reservoir and / or a compressed air generator and a hand-operated pneumatic gun connected to the compressed air reservoir or the compressed air generator. By the operator is a time limited connection of the compressed air gun with the compressed air supply input of Bogenstanz- and / or - progestation produced. As a result, a compressed air can be introduced into the pneumatic device of the closing frame.

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

Figur 1

eine Stanzmaschine mit einer Bogenstanz- und / oder -prägestation

Figur 2a

ein Stanzwerkzeug und eine Druckluftpistole beim Einbringen einer Druckluft

Figur 2b

eine Ansicht eines Stanzwerkzeugs

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

FIG. 1

a punching machine with a Bogenstanz- and / or -prägestation

FIG. 2a

a punching tool and a compressed air gun when introducing a compressed air

FIG. 2b

a view of a punching tool

In FIG. 1 the basic structure of a sheet punching and embossing machine 100 for punching, breaking, depaneling 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 depaneling 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 sheet punching and / or embossing station 2 according to the invention consists of a lower crucible, a so-called. Under table 9, and an upper crucible, a so-called. Obertisch 10. The upper table 10 is mounted vertically reciprocable and with an upper tool 30 with punching - and Rillmessern provided. The upper tool has a in the Fig. 2a and 2b closer frame 31 shown with a punching plate 32. The lower table 9 is fixedly mounted in the machine frame and provided with a counter-plate 20 to the punching and scoring knives. 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 breaking station 3, the sheet 6 enters the boom 4, where the sheet 6 is either simply stored, or at the same time there is a separation of the individual benefits of each sheet 6. For this purpose, the boom 4 has a Nutzentrennwerkzeug 21, 23. The boom 4 may also include a pallet 13, on the the individual sheets 6 or benefits are stacked in the form of a stack 14, so that after reaching a certain stack height, the pallet 13 can be moved away with the sheet stack 14 from the area of the punching and embossing machine 100. In order not to have to stop the machine 100 during the stack exchange, auxiliary stacking devices can be used.

In FIG. 2a a punching tool 30 is shown with a compressed air supply input 40. In the compressed air supply input 40, a compressed air gun 80, more precisely the tip of the compressed air gun 80, engage and thus a compressed air are introduced into the punching tool 30. The compressed air gun 80 is connected via air lines 81 to a compressed air reservoir 82. The compressed air reservoir 82 may be connected to a compressed air generator 83. Alternatively, the compressed air gun 80 could be directly connected to a compressed air generator 83.

FIG. 2b shows a punching tool 30 with its various components: a punching plate 32 with punching blades is held in a closing frame 31. The clamping of the punching plate 32 takes place by spring clamping devices 33. In this case, two spring clamping devices 33 are provided, which clamp the punching plate 32 in the sheet transport direction B, as well as two spring clamping devices 33 are provided which clamp the punching plate 32 transversely to the sheet transport direction B. The spring clamping devices 33 have in the illustrated embodiment, two compression coil springs 33.1, which press a clamping plate 36 against the punching plate 32. A respective spring clamping device 33 has pneumatic cylinder 33.2, which counteract in their active position of the spring clamping force, ie cancel the clamping action of the spring clamping device 33. The pneumatic cylinders 33.2 are connected to compressed air channels 39.1 and 39.2. There is a first channel 39.1, which supplies the located in the sheet transport direction B pneumatic cylinder 33.2 with compressed air. Next there is a second channel 39.2, which supplies the two transverse to the sheet transport direction B pneumatic cylinder 33.2 with compressed air. Both channels 39.1 and 39.2 terminate at the compressed air supply input 40 and can be acted upon by compressed air. Between the compressed air supply inlet 40 and a first pneumatic cylinder 33.2 is in a respective channel 39.1 or 39.2 a check valve 34.1 and 34.2 is provided, which holds the introduced into the channel system 39.1, 39.2 compressed air in the channel system and thus maintains the pressure acting on the pneumatic cylinder 33.2 pressure.

For aligning the punching plate 32 transversely to the sheet transport direction B, a centering element 37 is attached to the closing frame 31.

If a punching plate 32 located in the closing frame 31 is to be replaced, the machine operator inserts the tip of the compressed air gun 80 into the compressed air supply inlet 40 and, by actuating the compressed air gun 80, introduces compressed air into the channels 39.1, 39.2. This introduced compressed air causes the pneumatic cylinder 33.2 to be activated, counteract the spring force of the springs 33.1 and move the clamping plates 36 away from the punching plate 32 onto the closing frame 31. As a result, the clamping of the punching plate 32 is released and the punching plate 32 can be removed by the machine operator and replaced by another punching plate 32. In order to clamp the newly inserted punching plate 32 again in the closing frame 31, valves 35.1, 35.2 are provided in the channels 39.1, 39.2 in order to discharge the compressed air. The valves 35.1 and 35.2 can be controlled individually, so that first the first valve 35.1 can be controlled and the pressure in the first channel 39.1 can be reduced. Thus, the associated pneumatic cylinder 33.1 lose their effect and the punching plate 32 is clamped in the sheet transport direction B due to the spring clamping force of the spring clamping device 33. Subsequently, the second valve 35.2 is controlled and the compressed air in the second channel 39.2 degraded, so that in this case the associated pneumatic cylinder 33.2 lose their effectiveness and the punching plate 32 is also clamped transversely to the sheet transport direction B due to the spring clamping force of the spring clamps 33. In order to further optimize the clamping of punching plates 32, in particular of deformed or distorted punching plates 32, adjusting screws 38 are provided in the closing frame 31, which can exert an additional force on the punching plate 32. In the in FIG. 2b shown situation, the adjusting screws 38 are not used.

LIST OF REFERENCE NUMBERS

1

investor

2

Punching and / or embossing station

3

stripping

4

Outrigger, if necessary with Nutzentrennstation

5

machine housing

6

bow

7

Sheet transport system

8th

Gripper carriage with grippers

9

Lower table / lower crucible

10

Upper table / upper crucible

11

trimmings

12

container

13

palette

14

delivery pile

15

Control with interface and input devices

16

Feed table with a unit for aligning the bow

17

main drive

20

lower tool

21

Upper tool with punches

23

Dividing grille or stripping board (lower tool)

30

Upper tool (punching tool)

31

chase

32

Punching plate with punching blades

33

Spring clamp

33.1

feather

33.2

Pneumatic drive (pneumatic cylinder / pneumatic rail)

34.1

first check valve

34.2

second check valve

35.1

first valve

35.2

second valve

36

clamp

37

centering

38

adjusting screw

39.1

first channel

39.2

second channel

40

Compressed air supply input

80

Compressed air gun

81

Air line / hose

82

Compressed air storage

83

Compressed air generator / compressor

100

Flatbed sheet punching and / or embossing machine (punching machine)

B

Sheet transport direction

e

Sheet transport plane

Claims (9)

1. A sheet punching and/or embossing station (2) for a flat bed sheet punching and/or embossing machine (100), having an upper platen (9) and a lower platen (10), one of the two platens (9, 10) being liftable, and having a fastening frame (31) connected with said upper platen (9), and having a punching and/or embossing tool (32) which is held by said fixing frame (31), wherein a respective sheet (6) can be passed through between said platens (9, 10) in a sheet transport direction (B),
   characterized in that
   said fixing frame (31) comprises a spring clamping mechanism (33) for permanently clamping said punching and/or embossing tool (32) and a pneumatic device (33.2, 34.1, 34.2, 35.1, 35.2, 39.1, 39.2) for releasing the clamping of said punching and/or embossing tool (32), wherein said pneumatic device (33.2, 34.1, 34.2, 35.1, 35.2, 39.1, 39.2) comprises a compressed-air supply port (40) which is accessible from the outside of said sheet punching and/or embossing station (2) for temporarily supplying compressed-air.
2. The sheet punching and/or embossing station according to claim 1,
   characterized in that
   said sheet punching and/or embossing station (2) is not provided with a permanent compressed-air supply for clamping said punching and/or embossing tool (32).
3. The sheet punching and/or embossing station according to one of the preceding claims,
   characterized in that
   a respective spring clamping mechanism (33) communicates with at least one pneumatic cylinder (33.2), wherein a respective pneumatic cylinder is a part of said pneumatic device (33.2, 34.1, 34.2, 35.1, 35.2, 39.1, 39.2).
4. The sheet punching and/or embossing station according to one of the preceding claims,
   characterized in that
   said fixing frame (31) has at least one first spring clamping mechanism (33) for clamping said punching and/or embossing tool (32) in sheet transport direction (B) and at least one second spring clamping mechanism (33) for clamping said punching and/or embossing tool (32) in perpendicular direction to the sheet transport direction (B), and that a respective air duct (39.1, 39.2) each connected to said compressed-air supply port (40) is assigned to said at least one first and said at least one second spring clamping mechanism (33).
5. The sheet punching and/or embossing station according to claim 4,
   characterized in that
   each air duct (39.1, 39.2) comprises a back-pressure valve (34.1, 34.2).
6. The sheet punching and/or embossing station according to claim 4 or 5,
   characterized in that
   each air duct (39.1, 39.2) comprises a controllable throttle valve (35.1, 35.2) communicating with the environment for relieving the pressure in the respective air duct (39.1, 39.2).
7. The sheet punching and/or embossing station according to one of the preceding claims,
   characterized in that
   said fixing frame (31) comprises mechanical adjustment elements (38), in particular adjustment screws, for further adjusting said punching and/or embossing tool (32) in said fixing frame (31).
8. The sheet punching and/or embossing station according to one of the preceding claims,
   characterized in that
   said fixing frame (31) comprises a centering mechanism (37) for centering said punching and/or embossing tool (32) in terms of an alignment perpendicularly to the sheet transport direction (B).
9. A system comprising a flat bed sheet punching machine (100) comprising a sheet punching and/or embossing station (2) according to any one of the preceding claims, a compressed-air reservoir (82) and/or a compressed-air generator (83), and a manually operable compressed-air blow gun (80) communicating with said compressed-air reservoir (82) or said compressed-air generator (83), wherein a machine operator can connect said compressed-air blow gun (80) for a limited period of time with said compressed-air supply port (40) of said sheet punching and/or embossing station (2).

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