DE102011118905A1 - Processing station for sheet punching and/or embossing machine, has pushrod for shifting clamping element against spring force of spring tensioning device for stopping clamping operation - Google Patents

Abstract

The station has a clamping device (41.1) provided with a clamping element (43.1) and a spring tensioning device (42.1) for clamping the tool in a direction perpendicular to the sheet transport direction. A pushrod (44) is provided for shifting or twisting the clamping element against the spring force of the spring tensioning device for stopping the clamping operation.

Description

The invention relates to a processing station according to the preamble of claim 1 and a sheet punching and / or embossing machine 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, corrugated cardboard, plastic or foils 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 rigid 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 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.

The upper tools located in the stripping station or depanelling station, ie stripping tool and blanking tool, are held in the prior art by quick-release frames, whereby a quick replacement of the tools is made possible. It is known, on the one hand, to clamp the tool by means of a compression spring. The force required to cancel the board clamping is applied by a pneumatic cylinder. A disadvantage of this solution is that the pneumatic cylinder is exposed due to the lifting movements of the upper tool high vibration loads. These can lead to leaks on the pneumatic cylinder itself or on the required supply lines. On the other hand, it is known to pull the tool at its front and rear edge against a stop, and so jam. The clamping of the tool is done by turning eccentrics against these attacks. A disadvantage of this solution is that by the eccentric - in contrast to the use of springs - no length compensation is possible. While a spring can compensate for length tolerances of the tool by being more or less tensioned, the eccentrics can travel only a defined way and thus do not allow length compensation for length tolerances of the tools.

Object of the present invention is therefore to provide a processing station of a punching machine, the tool holder is both not susceptible to vibrations, and allows compensation of length tolerances of the tools.

This object is achieved by a processing station having the features of claim 1. The inventive processing station of a sheet punching and / or embossing machine for processing sheets of paper, cardboard, plastic and the like has a sheet transport system for transporting the sheets in a sheet transport direction through the processing station. The processing of a respective sheet is performed by an upper tool and a lower tool, which are each held by a tool holder. According to the invention, at least one tool holder has, on the one hand, a first clamping device, which has at least one first clamping element and a first spring clamping device for clamping the tool in the sheet transport direction, and also a second clamping device, which has at least one second clamping element and a second spring clamping device for clamping the tool perpendicular to the sheet transport direction has, as well as an actuating element for displacing or rotating of the at least first and the at least second clamping element against the spring force of the respective spring tensioning device for canceling the clamping. It is particularly advantageous if such a tool holder is used for the stroke-moving tool of the processing station, in particular it may be upper tools such as stripping tool or blanking tool. Since only one actuator is provided, the replacement of tools and their positioning and terminals in the tool holder by the machine operator can be done very quickly and easily. The time savings achieved when clamping the tools have a positive effect on the productivity of the punching machine, since the time required for the conversion can be reduced.

In a first embodiment, the actuating element has a double eccentric with two effective eccentricities, wherein each of the eccentricities can be considered as a curved contour, and a rotation of the eccentric causes the release of the clamping of the tool.

In an alternative, particularly advantageous and therefore preferred embodiment, the actuating element is designed as a push rod whose displacement causes the lifting of the clamping. Such a push rod is on the one hand easy to manufacture, further easy to store in the tool holder and finally to operate uncomplicated.

In an advantageous development of the processing station according to the invention, the push rod is provided with a first and a second curve contour, in such a way that during displacement of the push rod, the first curve contour imparting movement to the at least first clamping element, and the second curve contour to the at least second clamping element also a Imprinting movement. The displacement of the push rod in a first direction thereby allows alignment and clamping of the tool in the tool holder by the spring forces. Moving the push rod in the opposite direction, however, lifts the clamping by the spring forces. It when the curve contours are mounted so that the curve contours are effective offset in time, that is: these act with a time delay on the associated clamping element and thus an optimized cancellation of the clamping effect can be achieved is particularly advantageous. It is also advantageous that in this embodiment, the clamping sequence is predetermined. This prevents a wrong clamping sequence by the machine operator.

To transmit the movement of the rod, the tool holder can have, in an advantageous embodiment, first and second transmission elements, which are arranged between a respective curved contour and a respective clamping element.

In a particularly advantageous and therefore preferred embodiment, the push rod has a handle and can be actuated by hand. This allows for quick and easy operation. On actuators, which would be exposed to vibration loads, can be dispensed with. The push rod can be guided by rollers, which can be positioned on both sides of the push rod.

In an advantageous development of the processing station according to the invention, at least one transmission element has a toothed rack and a lockable toothed gear meshing with the toothed rack. As a rule, this gear remains locked and can thus transmit the pushing movement of the rack. To adjust the format of the tool holder to the format of the tool, the locking of the gear can be released for a short time, so that the gear can be moved on the rack. This format adjustment is based on 2a described in more detail below.

In an alternative embodiment, the transmission element has a pivotable about a hinge lever. In an advantageous embodiment of the processing station of the tool holder is a transmission element in rack owning own, which is associated with the one clamping element and another transmission element in lever design own, which is associated with the other clamping element. By using both embodiments of the transmission elements, the actuation of the first clamping device and the second clamping device can be skilfully accomplished.

The invention also relates to a sheet punching and / or embossing machine which is equipped with at least one processing station as described above.

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

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

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

2a a sectional view through the first clamping device

2 B a plan view of the first clamping device

3 a representation of the second clamping device

4 an alternative actuator

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 isolated from a pile, the sheet transport system 7 supplied and from on gripper bridges of a gripper carriage 8th gripped grippers taken at its front edge and in the sheet transport direction 13 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 bows 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 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 sub-table 9 , and an upper crucible, a so-called upper table 10 , The upper table 10 is vertically reciprocally mounted 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.

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 bows 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.

As in 2a shown, becomes a respective tool 19 . 20 . 21 . 23 . 30 from a first clamping device 41.1 a tool holder 40 in the sheet transport direction B at its downstream leading edge by a front tool receiving strip 40.1 taken up and at its upstream trailing edge by a first clamping element 43.1 clamped. In this case, a first clamping force F1 is effective, which of a first spring tensioning device 42.1 is applied. The first spring tensioning device 42.1 , which is designed as a compression spring, is supported against a Abstützklotz 410 and acts on a slide 406 , which is pushed to the left. The slider 406 is by means of a screw with a rack 407 connected, and thus transfers the clamping force F1 on the rack 407 , In the rack 407 engages a gear 412 a, which is held by a lock in a fixed state and can not rotate. This in turn transmits the gear 412 and its storage, the first clamping force F1 on the first clamping element 43.1 , which is designed as a rear tool holder strip. Should the clamping of the tool 19 . 20 . 21 . 23 . 30 be canceled, so is the provided with a curve contour push rod 44 as indicated by the double arrow b, moved. The push rod 44 lies on its one side surface on rollers 405 on which on a plate 408 are attached; on its other side surface, moving rollers roll 404 from. The curve contour 401 is on the second side surface of the push rod 44 applied. The rollers 404 are in the rack 407 stored.

While 2 B represents a snapshot to which the tool 19 . 20 . 21 . 23 . 30 is in a clamped state, shows 2 B the push rod 44 in a snapshot, to which the clamping of the tool 19 . 20 . 21 . 23 . 30 is canceled. Positions for the clamped state are indicated by dashed lines.

As it turned out 2a results, is the push rod 44 the tool holder 40 positioned so that the clamp is released. The rollers 404 are on the first curve contour 401 the push rod 44 unrolled and thereby moved in the image plane down. Because the rollers 404 in the rack 407 are stored, which in 2 B not shown, as it is below the plate 408 is, was the sliding movement b of the push rod in a sliding movement of the rollers 404 implemented and this sliding movement on the rack 407 transfer. About the in 2a illustrated coupling of the rack 407 over the gear 412 with the first clamping element 43.1 this is the clamping of the tool 19 . 20 . 21 . 23 . 30 canceled. The actuating movement b of the push rod 44 and the lifting of the clamping takes place against the first clamping force F1, ie against the spring force of the compression spring 42.1 : Because the slider 406 both with the rack 407 as well as with the first spring tensioning device 42.1 connected when operating the push rod 44 overcome the force F1. In other words, the spring 42.1 must be compressed. Moving the push rod 44 So causes a tension or relaxation of the spring 42.1 and thus allowing or canceling the clamping action on the tool.

If the editing tool 19 . 20 . 21 . 23 . 30 in the sheet transport direction B has a greater length, so can a format adaptation of the first clamping device 41.1 be made. For this purpose, the locking of the in 2a illustrated gear 412 resolved during the format adaptation process. The gear is thus rotatable and can be in position on the rack 407 be moved. Alternatively, a handle with load torque lock is used, which is achieved by fixing the handle at the same time the clamping and the adjustment is made. This displacement movement is indicated by the double arrow a.

After using the 2a and 2 B the clamping of the tool in the sheet transport direction or the repeal of this clamping has been described below with reference to 3 the mode of action of the second clamping device 41.2 described which a clamping of the tool 19 . 20 . 21 . 23 . 30 perpendicular to the sheet transport direction B causes.

This in 3 indicated tool 19 . 20 . 21 . 23 . 30 owns a so-called centerline block 24 , which allows the centering of the tool and thus its orientation transversely to the sheet transport direction B. This centerline log 24 is used to position the tool against a machine-fixed stop 409 pressed. This clamping takes place by a second clamping device 41.2 with a second clamping element 43.2 , The positions of the second clamping element 43.2 which with a lever 413 connected is in 3 shown in a snapshot, to which no clamping occurs. The positions of the second curve contour 402 and the second clamping element 43.2 to which a clamping takes place and a second clamping force F2 the centerline block 24 against the attack 409 is indicated by a dashed line. While the lever 413 the second clamping device 41.2 at one end the second clamping element 43.2 has, at its other end a roller 404 stored. The lever 413 itself gets through a joint 414 pivoted. At the lever 413 engages a second spring tensioning device 42.2 which is designed as a tension spring and permanently tries the second clamping element 43.2 against the attack 409 to draw. In the snapshot of 3 However, this is due to the second curve contour 402 the push rod 44 prevented. This second curve contour 402 is located at the bottom of the push rod 44 so the caster 404 on the curve contour 402 can roll. An actuation of the push rod 44 , ie a displacement movement b causes a shift of the curve contour 402 on which the roller 404 unwinds and thus a rotational movement de lever 413 against the spring force F2 of the tension spring 42.2 and thus a pivoting of the second clamping element 43.2 so that it can be pivoted from its non-action position shown in its operative position shown in dashed lines, and a clamping F2 of the centerline block 24 against the attack 409 can cause.

In an alternative embodiment, instead of the push rod 44 as actuator a double eccentric 45 be used like this in 4 is shown. The double eccentric 45 has two eccentricities, the first eccentricity having a first curve contour 401 and the second eccentricity a second curve contour 402 forms. A rotary movement c for actuating the double eccentric 45 causes a rotation of the curve contours 401 . 402 , Analogous to the embodiment described above with push rod 44 becomes the movement of the curve contour 401 on the first clamping element 43.1 and the movements of the curve contour 402 on the second clamping element 43.2 transferred, so here equally a clamping or lifting the clamping of the tool 19 . 20 . 21 . 23 . 30 can be done.

LIST OF REFERENCE NUMBERS

1

investor

2

Punching and / or embossing station

3

stripping

4

boom

5

machine housing

6

bow

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

20

Counter punch tool (punched chisel plate)

21

Upper tool with punches

23

Dividing grille or stripping board (lower tool)

24

Centerline Klotz

30

punching tool

40

tool holder

40.1

front tool holder strip

41.1

1. Clamping device

41.2

2. Clamping device

42.1

1. spring tensioning device

42.2

2. spring tensioning device

43.1

1st clamping element

43.2

2nd clamping element

44

Push rod (actuator)

45

Double eccentric (actuator)

100

Sheet punching and embossing machine

401

1. Curve contour

402

2. Curve contour

403

Handle

404

Caster movable

405

Castor fixed

406

pusher

407

rack

408

plate

409

attack

410

Abstützklotz

411

Guide element (screw)

412

Lockable gear

413

lever

414

joint

a

format adjustment

b

Actuation movement push rod

c

Actuating movement double eccentric

H

Lifting motion tool and tool holder for sheet processing

B

Sheet transport direction

e

Sheet transport plane

F1

first clamping force

F2

second clamping force

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]
• DE 202007012349 U1 [0026]

Claims (10)

Processing station ( 2 . 3 . 4 ) a sheet punching and / or embossing machine ( 100 ) for processing sheets ( 6 ) made of paper, cardboard, plastic and the like with a sheet transport system ( 7 ) for transporting the sheets ( 8th ) in a sheet transport direction (B) through the processing station ( 2 . 3 . 4 ), with an upper tool ( 21 . 30 ) and a lower tool ( 20 . 23 ) and a first tool holder ( 40 ) of the upper tool ( 21 . 30 ) and a second tool holder ( 40 ) of the lower tool ( 20 . 23 ), characterized in that at least one of the tool holders ( 40 ): - a first clamping device ( 41.1 ), comprising at least a first clamping element ( 43.1 ) and a first spring tensioning device ( 42.1 ) for clamping the tool ( 21 . 30 ) in the sheet transport direction (B) and - a second clamping device ( 41.2 ), comprising at least one second clamping element ( 43.2 ) and a second spring tensioning device ( 42.2 ) for clamping the tool ( 20 . 23 ) perpendicular to the sheet transport direction (B) and - an actuator ( 44 . 45 ) for shifting (b) or twisting (c) of the at least first and the at least second clamping element ( 43.1 . 43.2 ) against the spring force (F1, F2) of the respective spring tensioning device ( 42.1 . 42.2 ) to release the clamp. Processing station according to claim 1, characterized in that the actuating element is a double eccentric ( 45 ) with two effective eccentricities ( 401 . 402 ) whose twisting (c) causes the clamping to be released. Processing station according to Claim 1, characterized in that the actuating element is a push rod ( 44 ) whose displacement (b) causes the clamping to be canceled. Processing station according to claim 3, characterized in that the push rod ( 44 ) with a first and a second curve contour ( 401 . 402 ) is provided such that during displacement (b) of the push rod ( 44 ) the first curve contour ( 401 ) the at least first clamping element ( 411 ) and the second curve contour ( 402 ) the at least second clamping element ( 43.2 ) imposes a movement. Processing station according to claim 4, characterized in that the tool holder ( 40 ) first and second transmission elements ( 404 . 406 . 407 . 412 . 413 ), which between a respective curve contour ( 401 . 402 ) and a respective clamping element ( 43.1 . 43.2 ) are arranged. Processing station according to one of claims 3 to 5, characterized in that the push rod ( 44 ) a handle ( 403 ) and can be actuated by hand. Processing station according to one of claims 3 to 6, characterized in that the push rod ( 44 ) of rollers ( 404 . 405 ) to be led. Processing station according to one of claims 5 to 7, characterized in that at least one transmission element, a rack ( 407 ) and one with the rack ( 407 ) engaged, lockable gear ( 412 ) having. Processing station according to one of claims 5 to 8, characterized in that at least one transmission element as a to a joint ( 414 ) swivel lever ( 413 ) is executed. Sheet punching and / or embossing machine ( 100 ) for processing sheets ( 6 ) made of paper, cardboard, plastic and the like with a processing station ( 2 . 3 . 4 ) according to one of the preceding claims.

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