DE102014003294A1 - Stripping tool for a punching machine - Google Patents

Abstract

The invention relates to a stripping tool for a stripping station (3) of a flat bed punching machine (100), comprising a liftable upper tool (21), a stationary intermediate tool (23) and a likewise liftable lower tool (19) for breaking out waste parts (11) from a sheet-like element (6). According to the invention, the lower tool (19) has a layered structure with a carrier layer (41), an upper layer (43) and an intermediate elastic layer (42) arranged therebetween. The stripping tool advantageously has a simpler, more stable and less expensive construction and a significantly lower set-up effort compared to conventional tools.

Description

The invention relates to a stripping tool for a punching machine with the preamble features of claim 1.

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 packaging materials, film material, paper, cardboard, cardboard or corrugated board are mainly punched in sheet format but also in web format. When punching but also creasing lines or blind embossing can be introduced into the benefit. 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. In this case, in the case of sheet processing, 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 vertically movable by means of an eccentric upper table. Also known are machines in which the under table is moved by means of a toggle lever against a fixed upper table.

In known sheet punching and embossing machines that are used for punching, embossing, breaking, if necessary. Nutzentrennen and storing sheets of paper, cardboard and the same, it is known to move the sheet by means of gripper carriage through the individual stations of the machine. A respective gripper carriage has a gripper bridge, are attached to the gripper, which grip the bow 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 sheet through the machine, a high machine performance is possible because the sheets in the individual successively arranged stations of the machine, in particular punching, breaking and blanking station (cutting - stripping - blanking), are processed one after the other.

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, also referred to as crucibles, are equipped with cutting and scoring tools or corresponding counter tools with which punched out of the cyclically guided between the table surface bow 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.

A stripping tool usually consists of an upper tool and a lower tool, which are each equipped with Ausbrechstiften. In this case, take the pins of the upper tool and the congruent thereto arranged pins of the lower tool the blank waste between them and push through a breakout board on which the waste-free zones are not perforated and the waste zones are recessed by corresponding recesses. This breaks the breakpoints between blank trimmings and benefits. The number of stripping pins necessary varies from less than 10 to more than 500, depending on the die pattern of the die assembly. With a large number of stripping pins, the time required to set up the tool is very high, which affects the productivity of the sheet-fed and embossing machine. Breakout tools are for example in the DE 600 12 833 T2 and the DE 40 24 137 A1 described.

In addition to the high expenditure of time for setting up the stripping tools, the regularly required replacement of the sensitive stripping pins is disadvantageous, each resulting in high costs.

task

Object of the present invention is therefore to provide a stripping tool, which has a simpler, more stable and cheaper construction and has a significantly lower set-up effort.

This problem is solved by a stripping tool having the features of claim 1.

The stripping tool according to the invention for a stripping station of Flat bed punching machine has a hubbewegliches upper tool, a stationary intermediate tool, designed as a breaking board and also a liftable lower tool for breaking out waste parts of a sheet-like element, in particular of paper, cardboard, cardboard or plastic. The sheet-like element may in particular be a stamped sheet. The upper tool is arranged in particular above a transport plane, the intermediate tool below the transport plane and the lower tool under the intermediate tool. Upper tool, intermediate tool and lower tool cooperate in the breaking out of waste parts from the sheet-like element. Advantageously, the lower tool has a layered structure with a, in particular stable, carrier layer, a, in particular wear-resistant, upper layer and an interposed elastic intermediate layer.

The elastic intermediate layer advantageously contributes to cushioning a shock of the upper tool when clamping the waste parts. As a result, excessive loads on the stripping station or the flatbed sheet punching machine can be avoided altogether. Also, the wear of the pins of the upper tool and the upper layer or the pins of the lower tool can be kept low thereby.

Another advantage is that the lower tool has only a low weight compared to sub-tools with numerous pins according to the prior art. Another advantage results from the simple production of the lower tool and the associated low cost of the lower tool. Also, the set-up times of the breakout can be kept low by the lower tool according to the invention, since an adjustment of the lower tool to a respective order does not have to be made.

In a particularly advantageous and therefore preferred embodiment of the stripping tool according to the invention, the carrier layer has a plurality of recesses, which can also be referred to as cut-outs, through which the waste parts can fall through.

In a particularly advantageous and therefore preferred development of the stripping tool, the upper layer and the intermediate layer are formed as webs, wherein the webs extend along contour lines of the waste parts. These webs can then cooperate with the liftable upper tool and tear a respective waste part of a respective sheet-like element. An advantage of such a stripping tool is that it is cost-effective to manufacture and secondly, compared to conventional stripping tools significantly shorter set-up times for a job change exist.

In an alternative development of the stripping tool rigid pins or knives are attached to the upper layer, in particular screwed, clamped, riveted or welded.

In an advantageous embodiment of the stripping tool, the carrier layer can be designed as a wood board or multiplex board and / or the intermediate layer can be designed as a PU foam. These materials allow a simple production of the stripping tool and have the required properties: namely a high stability of the carrier layer and a permanently elastic intermediate layer.

In an advantageous embodiment, the carrier layer, the upper layer and the intermediate layer can be glued together. The layers can either be glued together first and then processed or the layers are first processed separately and then glued to each other.

In an advantageous embodiment of the stripping tool according to the invention, the carrier layer, the upper layer and the intermediate layer have a universal shape, such that only minor adjustments are required for the setup of the lower tool for a respective new order. This can be achieved in an advantageous manner in that the carrier layer, the upper layer and / or intermediate layer have a coarse-meshed lattice structure. For example, this coarse-meshed grid structure can then be adapted to an individual order by placing rigid pins or knives on the upper layer to order.

In an advantageous embodiment of the stripping tool, the carrier layer, the upper layer and the intermediate layer can be accommodated in a housing. The case fulfills a protective function and allows easy handling of the stripping tool.

The invention also relates to a flat bed punching machine having a breakout station as described above.

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

With regard to further advantages and constructive and functional advantageous embodiments of the invention, reference is made to the dependent claims and the description of exemplary embodiments with reference to the accompanying figures.

embodiment

The invention will be explained in more detail with reference to attached figures. Corresponding elements and components are provided in the figures with the same reference numerals. In favor of a better clarity of the figures was waived a true to scale representation.

It show in a schematic representation

1 a punching and embossing machine

2a C a first embodiment of the stripping tools according to the invention

3a C shows a second embodiment of the stripping tools according to the invention

In 1 is the basic structure of a sheet punching and embossing machine 100 shown for punching, breaking, depaneling and storing sheets of paper, cardboard, plastic and the like. The punching and embossing machine 100 owns a feeder 1 , a punching station 2 , a breakout station 3 and a boom 4 with storage and pay dividing station, by a common machine housing 5 be carried and enclosed and from a main drive 17 are driven. From one side, the so-called operator side, are the processing stations 2 . 3 . 4 accessible; on the opposite side, the so-called drive side, 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 bows 6 be through an investor 1 from a pile 6.1 through a so-called suction head 18 isolated, the sheet transport system 7 supplied and from on gripper bridges of a gripper carriage 8th gripped grippers seized at its front edge and in the sheet transport direction B intermittently through the various stations 2 . 3 and 4 the punching and embossing machine 100 pulled. The sheet transport system 7 has several gripper carriages 8th so that several sheets 6 at the same time in different stations 2 . 3 and 4 can be edited. The gripper carriage 8th can be driven by a chain drive.

The punching station 2 consists of a lower crucible, a so-called sub-table 9 , and an upper crucible, a so-called upper table 10 , The upper table 10 is vertically movable back and forth and with an upper tool 30 provided with punching and Rillmessern. The undercounter 9 is firmly mounted in the machine frame and with a counter plate 20 provided to the punching and Rillmessern. Alternatively, the upper table 10 fixed and the undertable 9 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 8th transports the bow 6 from the punching and embossing station 2 in the following stripping station 3 that with breakout tools 21 . 23 Is provided. In the stripping station 3 be using the stripping tools 21 . 23 the unwanted pieces of waste 11 out of the bow 6 pushed out to the bottom, causing the waste pieces 11 into a cart-like container inserted under the station 12 fall or be taken away from there. The stripping tools 21 . 23 will be described in more detail below with reference to the other figures.

From the breakout station 3 the bow comes 6 in the boom 4 where the bow 6 is either simply filed, or at the same time a separation of the individual benefits of each sheet 6 he follows. The boom has this 4 a blanking tool 21 . 23 , The boom 4 can also do a palette 13 included on the individual sheets 6 or benefit in the form of a stack 14 be stacked so that after reaching a certain stack height the pallet 13 with the sheet pile 14 from the field of punching and embossing machine 100 can be driven away. To the machine 100 Auxiliary stacking devices can be used during the stack exchange.

2a shows the basic structure of a lower tool 19 according to a first embodiment: On a carrier layer 41 , which forms a stable base, is an elastic intermediate layer 42 applied. On the interlayer 42 There is a wear-resistant upper layer 43 , A bow 6 becomes above the wear-resistant upper layer during the breaking operation 43 stopped and contacted during the breaking process.

In 2 B is an inventive substation (lower tool?) 19 shown in a plan view. The carrier layer 41 indicates the dimensions of the lower tool 19 up and is with recesses 44 Mistake. These recesses 44 serve on the one hand, that broken out waste 11 can drop down as well as to the fact that during the lifting movement of the lower tool 19 the displaced air can easily flow as well as to Weight reduction of the lower tool 19 , The elastic intermediate layer 42 and the wear-resistant upper layer 43 do not take the entire surface of the lower tool 19 one. Rather, form the elastic intermediate layer 42 as well as the wear-resistant upper class 43 the contour of pieces of waste to break out 11 after, leaving a piece of garbage to break out 11 during the lifting movement of the lower tool 19 between the upper tool 21 and the upper class 43 clamped and so targeted from a bow 6 is torn out. This process as well as the formation of the intermediate layer 42 and the upper class 43 is in 2c clarified. Shown is a detail of a cross-sectional view of a lower tool 19 , A respective bow 6 (not shown) is in sheet transport direction B in the transport plane E in the breaking station 3 transported and stopped there. A respective bow 6 lies on an intermediate tool 23 on, which is designed as a breaking board. Then the top tool 21 and the lower tool 19 moved towards each other until the waste pieces 11 of the bow 6 between pins of the upper tool 21 and the webs of the wear-resistant upper layer 43 are clamped. The so clamped waste pieces 11 be by a common lowering movement of the upper tool 21 and the lower tool 19 out of the bow 6 torn out. When the waste pieces 11 below the stripping board 23 can be the clamping of the waste pieces 11 be lifted and the upper tool 21 be lifted by a lifting movement upwards. The waste pieces 11 can then pass through the recesses 44 in the carrier layer 41 fall down, where, for example, a container 12 for collecting the waste pieces 11 can be located. An alternative construction of the lower tool 19 shows 3a : The lower tool 19 Here is also made of a carrier layer 41 , an intermediate layer above it 42 and an upper class located above it 43 built up. The layers are covered 41 . 42 . 43 from a lid-shaped housing 47 , which by means of clamping screws 48 with the carrier layer 41 can be screwed. As it turned out 3b results are in the housing 47 numerous recesses 44 as well as holes 45 , In a respective hole 45 became a pen 46 inserted, which with its upper end over the housing 47 stands out and with its lower end the upper class 43 contacted or attached to this. The pencils 46 serve the clamping of waste parts 11 (not shown) with opposite pins of a top tool also not shown here 21 , By attaching the pins 46 at the upper class 43 are the pins 46 thanks to the elastic intermediate layer 42 slightly yielding. As can be seen from the top view of 3b gives, possess the elastic intermediate layer 42 as well as the carrier layer 41 as well as in the first embodiment, numerous cutouts or recesses 44 through which the waste parts 11 can fall through. Also results from the representation of 3b that such a lower tool 19 must be made on an order-specific basis. The location of the recesses 44 as well as the positioning of the pins 46 must be based on the distribution of benefits on a sheet, the shape of a particular benefit as well as the position of the waste parts 11 on a respective arc 6 respectively.

According to a development of this alternative embodiment is in 3c therefore a lid-shaped housing 47 used, which can be used for different orders. In particular, there are different housing 47 to choose from, depending on the layout, the utility and the location of the pieces of waste 11 can be selected on a respective sheet. This eliminates the burden of customization of the housing 47 ,

The carrier layer 41 , the intermediate layer 42 as well as the upper class 43 can have a grid-shaped structure. This ensures that numerous recesses 44 are available through which pieces of waste 11 can be disposed of. In the manufacture of the lower tool 19 In contrast to this grid or grid care is taken that at the locations of the lower tool 19 Footbridges from the layers 41 . 42 . 43 are available where pins 46 must be placed to pieces of rubbish 11 to be able to break out.

The processing or production of the lower tool 19 can be done in all the above-described embodiments, preferably by a laser processing. So either the different layers 41 . 42 . 43 glued together and then edited or every layer 41 . 42 . 43 is processed separately, ie trimmed before the layers 41 . 42 . 43 interconnected, z. B. glued.

All described embodiments of the lower tool 19 have an elastic intermediate layer 42 , This serves to cause a collision of the upper tool 21 when pinching the pieces of waste 11 is cushioned. This can put too much stress on the stripping station 3 or the flatbed sheet punching machine 100 be avoided altogether with their guides and tool holders. Also, this can wear the pins of the upper tool 21 as well as the upper class 43 or the pins 46 of the lower tool 19 be kept low.

According to the invention, a pick and place machine can be provided, which can be executed as a robot, the pins 46 Benefits based on provided layout data a respective bow 6 automatically to the correct position of the lower tool 19 placed.

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

6.1

sheet pile

7

Sheet transport system

8th

Gripper carriage with grippers

9

Lower table / lower crucible

10

Upper table / upper crucible

11

Trimmings / waste parts

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

18

suction head

19

lower tool

20

Stanzrillplatte

21

Upper tool with pins or punches

23

Dividing grille or stripping board (intermediate tool)

30

Upper tool (punching tool)

41

backing

42

interlayer

43

top layer

44

recess

45

drilling

46

pen

47

casing

48

clamping screw

100

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

B

Sheet transport direction

e

Sheet transport plane

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 3044083 A1 [0004]
• US 7658378 B2 [0004]
• DE 60012833 T2 [0005]
• DE 4024137 A1 [0005]

Claims (10)

Stripping tool for a stripping station ( 3 ) of a flatbed punching machine ( 100 ), comprising a liftable upper tool ( 21 ), a stationary intermediate tool ( 23 ) executed as Ausbrechbrett and also a liftable lower tool ( 19 ) for breaking up waste parts ( 11 ) of a sheet-like element ( 6 ), characterized in that the lower tool ( 19 ) has a layered structure with a carrier layer ( 41 ), an upper class ( 43 ) and an interposed elastic intermediate layer ( 42 ). Stripping tool according to claim 1, characterized in that the carrier layer ( 41 ) a plurality of recesses ( 44 ) through which the waste parts ( 11 ) can fall through. Stripping tool according to one of the preceding claims, characterized in that the upper layer ( 43 ) and the intermediate layer ( 42 ) are formed as webs, wherein the webs along contour lines of the waste parts ( 11 ). Stripping tool according to one of claims 1 or 2, characterized in that at the upper layer ( 43 ) rigid pins or knives ( 46 ) are attached. Stripping tool according to one of the preceding claims, characterized in that the carrier layer ( 41 ) is designed as a wood board or multiplex board and / or that the intermediate layer is designed as a PU foam. Stripping tool according to one of the preceding claims, characterized in that the carrier layer ( 41 ), the upper class ( 43 ) and the intermediate layer ( 42 ) are glued together. Stripping tool according to one of the preceding claims, characterized in that the carrier layer ( 41 ), the upper class ( 43 ) and the intermediate layer ( 42 ) have a universal shape, such that for the setup of the lower tool ( 19 ) only minor adjustments are required for a given contract. Stripping tool according to claim 7, characterized in that the carrier layer ( 41 ), the upper class ( 43 ) and / or the intermediate layer ( 42 ) have a coarse-meshed lattice structure. Stripping tool according to one of the preceding claims, characterized in that the carrier layer ( 41 ), the upper class ( 43 ) and the intermediate layer ( 42 ) in a housing ( 47 ) are included. Flatbed punching machine ( 100 ) with a stripping station ( 3 ) with a stripping tool according to one of the preceding claims.

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