TWI579128B - A sheet shearing and / or embossing machine with a pressure air operated closed frame - Google Patents

Description

Sheet die cutting and/or stamping machine with closed frame with pressure air control

The present invention relates to a sheet die cutting and/or embossing machine as described in the preamble of claim 1 and a system according to claim 9 wherein the system comprises a platform type stencil Cutting machine and pressure air gun.

Cutting by a closed geometry cutting die is referred to as "die cutting", which can be circular, elliptical or polygonal and any form of irregular shape. The processing carried out in the post-press processing, such as die cutting, chamfering and index die cutting using a punch, also belongs to the field. Die cutting is performed toward a die-cutting block or toward a punch, and part is also a shearing process. Packaging materials made of paper, cardboard, cardboard or corrugated paper are mainly die cut in sheet sizes. Stripe lines or arches may additionally be applied to the useful portion during the die cutting process. This complicated processing makes it absolutely necessary for the sheets to be die-cut individually. Because the final product involves packaging that has extremely high requirements in the implementation of technology and graphics (for packaging for cosmetics, cigarettes, pharmaceuticals, food, etc.), it not only imposes special requirements on the packaging material itself, but also for the best. The result is a die cutting tool with minimal tolerances and an extremely precise and reliable die cutting machine. The platform die cutting machine best meets these requirements. Here, the printed person and the sheets stacked on the pallet are supplied to the die-cutting machine. In this machine, the sheets to be die-cut are precisely oriented in an orientation device, received by a gripper and precisely in the die-cutting device under fixed support and through a toggle or eccentric transmission Vertical motion is positioned between the tops.

Recognized in a die-cutting and stamping machine for sheet cutting, embossing, stripping, and useful partial separation and collection of sheets consisting of paper, cardboard and the like, by means of a gripper The car moves the sheet through the various stations of the machine. The corresponding gripper truck has a gripper bridge on which the gripper is fixed, the gripper Hold the front end of the sheet. The gripper car also has a side-mounted vehicle that is connected to the endless chain of the conveyor system and thereby moves the gripper car through the machine. This movement of the sheet through the machine allows continuous operation in the various stations, in particular the die cutting station, the stripping station and the useful partial separation station, which are arranged one after the other before and after the machine.

A platform type die cutting machine of this type is known, for example, from DE 30 44 083 A1. The two stages are equipped with cutting and grooving knives or corresponding mating knives, which are used to cut the useful portion from the tabs that are guided from the beat to the table and simultaneously press the grooves required for the neat folding. The waste is mechanically removed by a stripping tool in a subsequent stripping device. Depending on the equipment of the machine, the useful part of the die cut can finally be separated in the useful part separation device provided for this purpose.

A device for sheet die cutting and stamping presses is known from DE 195 16 073 A1. In the receiving frame of the device, the carrier plate is clamped and oriented in a coarse manner by means of adjustment and retaining screws. Fine adjustment is then carried out by the movement of the stop in the receiving frame of the carrier plate. For clamping, orientation and then fine adjustment, the operator must manually tighten the adjustment and retaining screws and also manually adjust the receiving frame until the carrier plate is correctly oriented in the device. The disadvantage is that the locking has to be carried out in a time-consuming manner by means of screws.

It is further recognized that an eccentric frame is used which clamps the tool by twisting of the eccentric. The disadvantage is that the tool is not clamped evenly.

EP 1 418 030 A1 discloses a sheet die-cutting and embossing machine having means for die-cutting a useful portion from a sheet, having a frame for receiving a carrier plate equipped with a die-cutting and grooving knife, The carrier plate can be clamped in the frame by means of a hydraulically actuated clamping element, wherein the hydraulic pressure for clamping is established in the hydraulic system by a piston which is supported by a mechanical spring.

The disadvantage of using a hydraulic system is that it requires a hydraulic seal to be costly. This is particularly difficult due to the stroke movement of the tool. If it causes a leak and passes through the page Sheet die-cutting and stamping machines for products manufactured in the food industry will make the product no longer usable even if it is slightly contaminated.

The object of the invention is to provide a sheet die-cutting and/or embossing station which, in the case of a simple construction and a simple operation, allows a reliable clamping of the die-cutting and/or embossing tool and is avoided here by the prior art. The disadvantages of the clamping device.

The object is solved by a sheet die cutting and/or stamping machine having the features of claim 1 of the scope of the patent application. According to the invention, a sheet die cutting and/or embossing station for a platform type sheet die cutting machine is proposed, which has an upper table and a lower table, a closed frame, and a die cutting and/or embossing tool. Wherein one of the two stages performs a stroke movement, the closure frame is coupled to the upper table, and the die cutting and/or embossing tool is held by the closed frame. In order to process sheets consisting of paper, cardboard, plastic and the like by sheet-cutting and/or embossing stations, the respective sheets are moved between the two stages in the sheet conveying direction. According to the invention, the closure frame comprises, for example, a spring clamping device with a helical compression spring for permanently clamping the die cutting and/or embossing tool, and further comprising means for canceling the die cutting and/or embossing Pneumatic device for clamping the tool. Advantageously, the pneumatic device has a pressurized air supply inlet for temporary input of pressurized air that is accessible from outside the sheet die cutting and/or stamping station. The advantage of this is that the force must only be applied from the outside when the clamping of the tool should be cancelled. Furthermore, it is advantageous that the use of pressurized air is not critical in handling food packaging compared to hydraulic fluids. The sheet die cutting and/or stamping station of the invention does not have a permanent pressurized air supply, but instead inputs the pressurized air only briefly through the pressurized air supply inlet, which then acts in the pneumatic device. Advantageously, in the event of movement of the upper table, it is not necessary to provide a pressure air input line that follows the stroke movement of the tool. This makes it possible to achieve a simpler and less expensive construction of the sheet die cutting and/or stamping station.

In an advantageous further development of the sheet-cutting and/or embossing station of the invention, the respective spring-clamping device is associated with at least one pneumatic device, for example a pneumatic cylinder or a piston-free pneumatic actuator, for example a pneumatic rail (they are behind) Referring to the pneumatic cylinder as an active connection, the corresponding pneumatic cylinder is part of the pneumatic device. Thereby, the corresponding at least one pneumatic cylinder can counteract the spring force of the spring clamping device, so that the clamping of the tool can be eliminated.

In a particularly advantageous further development of the station according to the invention, the closure frame has at least one first spring clamping device for clamping the die cutting and/or embossing tool in the sheet conveying direction, And at least one second spring clamping device for clamping the die cutting and/or embossing tool perpendicular to the sheet conveying direction. An air passage connected to the pressurized air supply inlet is respectively disposed in the at least one first spring clamping device and the at least one second spring clamping device. In other words, the same air passage connects the pressurized air supply inlet to the pneumatic cylinders assigned to the respective first and second spring clamping devices. Since each spring clamping device is connected to the pressure air supply inlet, the clamping of the tool can be quickly released by the supply of pressurized air and the operation of the tool can be kept simple.

In an advantageous further development, each air channel has a check valve. This maintains the pressure in the air passage and the pneumatic cylinder.

In an advantageous further development, each air passage has a controllable throttle connected to the surrounding environment in order to reduce the pressure in the respective air passage. This has the advantage that the clamping force acting on the tool perpendicular to the sheet conveying direction, that is to say in the lateral direction and in the sheet conveying direction, that is to say in the circumferential direction, can be acted upon and thus Prevents clamping in the sense of tool or closed frame deformation.

In a further embodiment, the closed frame of the sheet die cutting and/or embossing station has mechanical adjustment elements, in particular adjustment screws, in order to additionally adjust the closure frame. Medium die cutting and / or embossing tools. This makes it possible to manipulate and re-adjust the tools that are distorted in terms of geometry.

In a further advantageous embodiment, the closed frame of the sheet die-cutting and/or embossing station has a centering element for the die-cutting in the sense of orienting the tool perpendicular to the sheet conveying direction. / or embossing tools for centering.

The invention also relates to a system comprising a platform-type sheet die-cutting machine having a sheet die-cutting and/or embossing station as described above and further comprising a pressurized air reservoir and/or a pressurized air generator and A manually operated pressure air gun connected to a pressurized air reservoir or a pressurized air generator. The connection of the pressure air gun to the pressure air supply inlet of the sheet die cutting and/or stamping station can be produced in a time-limited manner by the machine operator. Pressure air can thereby be introduced into the pneumatic device of the closed frame.

The invention and the further advantageous further aspects of the invention described above also form a further advantageous embodiment of the invention in any combination.

In the case of further advantages and advantageous configurations of the invention, reference is made to the scope of the dependent claims and the description of the embodiments with reference to the drawings.

A schematic structure of a sheet die cutting and stamping machine 100 for die cutting, stripping, useful partial separation and collection of sheets made of paper, cardboard, plastic and the like is shown in FIG. The die cutting and stamping machine 100 has a refilling device 1, a die cutting station 2, a stripping station 3, and a receiving device 4 having a collecting-and-use portion separation station, which are shared by a common machine housing. 5 is carried and surrounded and driven by the main drive 17. The processing stations 2, 3, 4 are accessible from one side, the so-called operating side; on the opposite side, the so-called driving side, there is a sheet die cutting and drive system for the stamping machine 100. The machine control device 15 controls the flow inside the die cutting machine 100.

The sheet 6 is sorted from a stack by a refill device 1 and supplied to The sheet conveying system 7 and by the gripper fixed to the gripper bridge of the gripper cart 8 grasps its leading edge and is intermittently drawn through the die cutting and stamping machine along the sheet conveying direction B 100 different stations 2, 3 and 4. The sheet conveying system 7 has a plurality of gripper carts 8 such that a plurality of sheets 6 can be processed simultaneously in the different stations 2, 3 and 4. The gripper cart 8 is driven by a chain drive or in an alternative embodiment by an electromagnetic linear drive with a traveling wave field motor, as described in DE 20 2007 012 349 U1.

The sheet die cutting and/or stamping station 2 according to the invention comprises a lower table, a so-called lower table 9 and an upper table, the so-called upper table 10. The upper stage 10 is supported for vertical reciprocation and is provided with a tool 30 with a die cut and a slotting knife. This tool has a closure frame 31, shown in detail in Figures 2a and 2b, which has a die cutting plate 32. The lower stage 9 is fixedly supported in the frame and is disposed on the mating plate 20 in which the die cutting and the slotting knife are fitted. Instead of fixing the upper stage 10 and moving the lower stage 9, it is also possible. In the case of embossing, an embossing tool is used instead of the die-cutting and grooving tool, in particular in the form of a so-called embossed relief.

The gripper cart 8 transports the sheets 6 from the die cutting and stamping station 2 to the stripping station 3 equipped with the stripping tools 21, 23. In the stripping station 3, the unwanted scrap section 11 is punched out from the sheet 6 by means of a stripping tool, whereby the scrap section 11 falls into a cart that is pushed underneath the station In the container 12.

The sheet 6 arrives from the stripping station 3 in the receiving device 4, where the sheet 6 is simply collected or simultaneously separated from the six useful portions of the respective sheet. To this end, the receiving device 4 has a useful partial separation tool 21, 23. The take-up device 4 can also comprise a pallet 13 on which the individual sheets 6 or useful portions are stacked in the form of a stack 14, whereby the stack of sheets 14 can be reached after a certain stack height has been reached. The pallet 13 is removed from the area of the die cutting and stamping machine 100. In order to allow the machine 100 to not have to be shut down during the replacement stack, an auxiliary stacking device can be employed.

A die cutting tool 30 having a pressurized air supply inlet 40 is shown in Figure 2a. A pressure air gun 80, specifically the tip end of the pressure air gun 80, can be inserted into the pressure air supply inlet 40 and thereby introduce pressurized air into the die cutting tool 30. The pressurized air gun 80 is connected to the pressurized air reservoir 82 through an air duct 81. The pressurized air reservoir 82 can be coupled to the pressurized air generator 83. Alternatively, the pressurized air gun 80 can be directly coupled to the pressurized air generator 83.

Figure 2b shows a die cutting tool 30 having different components: the die cutting plate 32 with the die cutter is held in the closed frame 31. The clamping of the die cutting plate 32 takes place here by means of a spring clamping device 33. Here, two spring clamping devices 33 for clamping the die cutting plate 32 in the sheet conveying direction B and two spring clamping devices for clamping the die cutting plate 32 transversely to the sheet conveying direction B are provided. 33. In the embodiment shown, the spring clamping device 33 has two helical compression springs 33.1 which press the clamping plate 36 against the die cutting plate 32. Corresponding spring clamping device 33 has a pneumatic cylinder 33.2 which, in its active position, counteracts the spring clamping force, that is to say cancels the clamping action of the spring clamping device 33. The pneumatic cylinder 33.2 is connected to the pressure air passages 39.1 and 39.2. There is a first passage 39.1 which supplies pressurized air to the pneumatic cylinder 33.2 arranged along the sheet conveying direction B. Furthermore, a second channel 39.2 is provided which supplies pressurized air to two pneumatic cylinders 33.2 arranged transversely to the sheet conveying direction B. The two channels 39.1 and 39.2 end at the pressurized air supply inlet 40 and the pressurized air can be loaded through the pressurized air supply inlet. Between the pressure air supply inlet 40 and the first pneumatic cylinder 33.2, a check valve 34.1 or 34.2 is provided in the respective passage 39.1 or 39.2, which maintains the pressure air introduced into the passage systems 39.1, 39.2 The pressure in the channel system and thus on the pneumatic cylinder 33.2 is maintained.

In order to orient the die cutting plate 32 transversely to the sheet conveying direction B, a centering element 37 is placed on the closing frame 31.

If the die cutting plate 32 located in the closed frame 31 is to be replaced, the machine operator introduces the tip of the pressurized air gun 80 into the pressurized air supply inlet 40 and introduces pressurized air into the passages 39.1, 39.2 by manipulating the pressurized air gun 80. in. The introduction of the pressurized air causes the pneumatic cylinder 33.2 to be activated against the spring force of the spring 33.1 and cause the clamping plate 36 to move away from the dieboard 32 towards the closed frame 31. The clamping of the dieboard 32 is thereby eliminated and the dieboard 32 can be removed by the machine operator and replaced by another dieboard 32. In order to be able to clamp the newly placed die cutting plate 32 in the closed frame 31 again, valves 35.1, 35.2 are provided in the channels 39.1, 39.2 in order to discharge the pressurized air. The valves 35.1 and 35.2 can here be individually controlled so that the first valve 35.1 can be controlled first and the pressure in the first channel 39.1 can be reduced. As a result, the corresponding pneumatic cylinder 33.1 loses its function and the die cutting plate 32 is clamped in the sheet conveying direction B due to the spring clamping force of the spring clamping device 33. The second valve 35.2 is then controlled and the pressure in the second passage 39.2 is lowered, so that the corresponding pneumatic cylinder 33.2 loses its effect and the die cutting plate 32 is transverse to the sheet due to the spring clamping force of the spring clamping device 33. The conveying direction B is clamped. In order to further optimize the clamping of the dieboard 32, in particular the clamping of the deformed or twisted dieboard 32, an adjustment screw 38 is provided in the closure frame 31, which can apply an additional force to the die cutting On board 32. In the situation shown in Figure 2b, no adjustment screw 38 is used.

1‧‧‧ Refilling device

2‧‧‧ Die-cutting and/or stamping stations

3‧‧‧disposal station

4‧‧‧ Receiving device, with useful partial separation station if necessary

5‧‧‧ machine housing

6‧‧‧ pages

7‧‧‧ Sheet conveying system

8‧‧‧Picker truck with grabber

9‧‧‧Under/lower workbench

10‧‧‧Upper/Upper Workbench

11‧‧‧ scrap section

12‧‧‧ Container

13‧‧‧ pallet

14‧‧‧ receiving stack

15‧‧‧Control device with interface and input instrument

16‧‧‧Supply table with units for oriented sheets

17‧‧‧Main drive

20‧‧‧ Tools

21‧‧‧With the tool above the punch

23‧‧‧Useable partial grille or waste bed (lower tool)

30‧‧‧Upper tool (die cutting tool)

31‧‧‧Closed frame

32‧‧‧Mold cutting board with die cutter

33‧‧‧Spring clamping device

33.1‧‧‧ Spring

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‧‧‧ clamping plate

37‧‧‧Centering components

38‧‧‧Adjustment screws

39.1‧‧‧First Passage

39.2‧‧‧second channel

40‧‧‧Pressure air supply inlet

80‧‧‧pressure air gun

81‧‧‧Air pipe/hose

82‧‧‧Pressure air reservoir

83‧‧‧Pressure air generator/compressor

100‧‧‧Platform sheet die cutting and / or stamping machine (die cutting machine)

B‧‧‧ sheets conveying direction

E‧‧‧ sheet conveying plane

The invention is explained in more detail below on the basis of examples. The figure shows schematically: Figure 1 is a die-cutting machine with a sheet die-cutting and/or stamping station, Figure 2a is a die-cutting tool and a pressure air gun when pressurized air is introduced, and Figure 2b is a view of the die-cutting tool.

30‧‧‧Upper tool (die cutting tool)

40‧‧‧Pressure air supply inlet

80‧‧‧pressure air gun

81‧‧‧Air pipe/hose

82‧‧‧Pressure air reservoir

83‧‧‧Pressure air generator/compressor

Claims (8)

A sheet die cutting and/or stamping station (2) for a platform type sheet die cutting machine (100) having an upper table (10) and a lower table (9), a closed frame (31), and a die cutting and/or embossing tool (32), wherein one of the two stages (9, 10) performs a stroke movement, the closed frame being coupled to the upper table (10), the die cutting And/or the embossing tool is held by the closed frame (31), wherein the respective sheets (6) move between the two tables (9, 10) in the sheet conveying direction (B), Characterized in that the closure frame (31) has a spring clamping device (33) for permanently clamping the die cutting and/or embossing tool (32) and for eliminating the die cutting and/or embossing Pneumatic device (33.2, 34.1, 34.2, 35.1, 35.2, 39.1, 39.2) clamped by the tool (32), wherein the pneumatic device (33.2, 34.1, 34.2, 35.1, 35.2, 39.1, 39.2) has The sheet die cutting and/or the exterior of the stamping station (2) is adjacent to a pressurized air supply inlet (40) for temporarily inputting pressurized air. The sheet die-cutting and/or stamping station according to the first aspect of the patent application, wherein the respective spring clamping device (33) is respectively connected to at least one pneumatic cylinder (33.2), wherein the corresponding pneumatic cylinder ( 33.2) is part of the pneumatic device (33.2, 34.1, 34.2, 35.1, 35.2, 39.1, 39.2). The sheet die-cutting and/or embossing station according to the first aspect of the invention, wherein the closed frame (31) has means for clamping the die-cutting in the sheet conveying direction (B) and/or Or at least one first spring clamping device (33) of the embossing tool (32), and at least one of clamping the die cutting and/or embossing tool (32) perpendicular to the sheet conveying direction (B) a second spring clamping device (33); and each of the at least one first spring clamping device and the at least one second spring clamping device (33) is configured to be coupled to the pressurized air supply inlet (40) Air passage (39.1, 39.2). a sheet die-cutting and/or stamping station as described in item 3 of the scope of the patent application, wherein each Each air channel (39.1, 39.2) has a check valve (34.1, 34.2). According to the sheet die cutting and/or stamping station of claim 3 or 4, wherein each air passage (39.1, 39.2) has a controllable throttle connected to the surrounding environment ( 35.1, 35.2) to reduce the pressure in the corresponding air passage (39.1, 39.2). The sheet die cutting and/or embossing station according to the first aspect of the patent application, wherein the closure frame (31) has a mechanical adjustment element (38) for additionally adjusting the closure frame (31) Die cutting and / or embossing tools (32). The sheet die cutting and/or stamping station according to claim 1 wherein the closed frame (31) has a centering element (37) for orientation in a direction perpendicular to the sheet conveying direction (B) The die cutting and/or embossing tool (32) is centered in the sense. A system comprising a platform-type sheet die-cutting machine (100), the platform-type sheet die-cutting machine having the sheet die-cutting and/or pressing of any one of the above-mentioned claims 1 to 7 Printing station (2), the system comprising a pressurized air reservoir (82) and/or a pressurized air generator (83), connectable to the pressurized air reservoir (82) or the pressurized air generator (83) for manual control a pressure air gun (80), wherein the pressure air supply (80) and the pressure air supply inlet of the sheet die cutting and/or stamping station (2) can be generated in a time-limited manner by a machine operator (40) Connection.