DE9013010U1 - Device for processing cardboard sheets or similar sheet material - Google Patents

Description

M-249.02

Contraption for the Editing cardboard sheets od.dql. Bogenwateriai

Description

01e invention relates to a device for processing cardboard sheets in the cardboard box industry with a stripping pin fixed to a stripping board, by means of which the cutting or cutting edges of the cardboard sheet ϕ-'&Iacgr;'" ¹ . are led out of their plane.

When making folding boxes, mainly cardboard sheet material is processed. In the so-called sheet delivery, one or more cuts or blanks are inserted into the cardboard sheet or similar, depending on the sheet and folding box size. In any case, waste or waste pieces are created that are connected to the blank and separated from it by predetermined breaking lines. The aim is to allocate the blanks to one another in the sheet delivery in such a way that as little waste as possible is created, which, incidentally, is obviously also generated differently for different blanks.

M-249.02

After the sheets have been laid out, the sheet material is continuously punched and grooved in a flat punching machine, i.e. the fold, bend and predetermined breaking lines are introduced or embossed. The waste is then removed using stripping tools that grip the waste pieces on both sides with pressure elements, hold the waste piece in a clamping manner and pull it out of the sheet plane.

Such stripping tools are known, for example, from DE-AS 10 85 759; the waste piece is pressed out of the cardboard sheet by a plate that moves perpendicularly to it onto the head of a shaft that is spring-mounted underneath and then thrown off from it. Such a device is relatively complicated and expensive, especially since a sheet layout often requires the use of one hundred to two hundred individual stripping tools. In addition to this high capital commitment, there is the disadvantage of the extremely time-consuming setting of the stripping tools on a preparation table outside the machine that carries out the stripping process.

Similar defects are inherent in a stripping device with two rollers rotating on both sides of the cardboard sheet, one of which carries radial stripping pins according to DE-AS 16 11 617.

M-Z49.02

In the folding box industry, orders are often recurring, so that as many preparations as possible are left standing in order to avoid high set-up times. For this reason, stripping boards with nails driven in by hand have long been used as stripping tools for recurring orders and these are screwed to the upper tool frame of the machine. This is a very inaccurate method that leads to frequent malfunctions in the punching machines.

An improvement on the state of the art is represented by a device according to DE-OS 37 34 535; according to its teaching, individual stripping pins are transferred from a magazine device 1 into the impact path of a printing element.

In this case, several individual stripping pins are to be detachably secured at a radial distance from one another to a strand-like magazine band, on the path of movement of which the piston or the like is arranged, directed approximately parallel to the stripping pins.

The magazine band brings the stripping pins into the impact path of the piston, which then releases a stripping pin from the magazine band and drives it into the stripping plate at exactly the right point. During the impact or driving process, the magazine band is swung sideways away from the piston.

For such and other devices, special stripping pins are required, which are to be anchored quickly and, above all, firmly to 1 m stripping board.

In view of these circumstances, the inventor has set himself the goal of improving a device of the type described above by using specially designed stripping pins.

To solve this problem, the bolt-like stripping pin tapers conically towards its driving end and forms a ring edge that surrounds an axial hole in the stripping pin. The length of the conical area of the stripping pin should preferably correspond to about two thirds of its diameter.

According to a further feature of the invention, the axial bore is a blind hole, the diameter of which in a preferred embodiment measures approximately half the diameter of the break-out pin.

The conical end of the stripping pin pushes the wood of the stripping board outwards during pressing, which leads to a compaction of the wood mass - with the greatest compaction in the middle area ~ and gives the stripping pin a very firm press. The strong friction forces simultaneously prevent the stripping pin from loosening and moving out.

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During drilling, the wood is also compacted in the direction of impact, which limits the depth of the impact path to a certain extent.

Within the scope of the invention, there is at least one ring notch formed in the peripheral surface of the stripping pin at a distance of 1n from the ring edge.

This ring notch - preferably with a sawtooth cross-section or in the form of an edge1, cord or similar - can be screwed into the circumference for additional security and has a further anchoring effect.

The stripping pin according to the invention offers, among other things, the following advantages over the state of the art, in addition to unproblematic production:

- a much firmer fit;

- equal load capacity in all directions:

- no widening of the slots, thus safe insertion and introduction into the magazine and cylinder shaft or mouthpiece tube of the device;

- universal applicability.

M-24<).02

Further advantages, features and details of the invention emerge from the following description of preferred embodiments and from the drawings, which show in schematic cross sections ii>

Fig. 1: a device for attaching stripping pins to a stripping board;

Fig. 2: an enlarged detail of Fig. 2;

Fig. 3: the section through Fig. 2 along the line III&mdash;III;

Fig. 4: another version of Fig. 2.

Folding boxes or similar are made from blanks, several of which are arranged on a cardboard sheet in such a way that as few waste pieces as possible are created between them. The sheet material or the cardboard sheet is continuously provided with creasing or punching lines in a flat-cutting machine

From the flat-punching machine, the punched and grooved cardboard sheet is sent to a stripping station, in which each waste piece is broken out of the cardboard sheet by means of stripping pins 10 of a stripping plate 12.

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Fig. 1 shows, for example, a piston 14 of a machine not shown for reasons of clarity, which is provided with a downwardly directed cylindrical shaft 16 or mouthpiece tube; in this is mounted a stripping pin 10 - released, for example, by a magazine belt - which is guided to the stripping plate 12 and driven into it by the piston 14 (arrow y).

The break-out pin 10 consists of a metal bolt of diameter d with a blind hole 18 axially inserted at one end, the diameter e of which corresponds approximately to half the bolt diameter d. The length η of the blind hole 18 is approximately 1.5 times the diameter d.

The blind hole diameter e determines a lower ring edge 20 of the breakout pin 10, which increases conically over a length a from this ring edge 20 to the bolt diameter d in a region 22; this length a of the conical region 22 corresponds to approximately one third of the bolt diameter d.

At a distance b from the ring edge 20 approximately equal to the bolt diameter d, a shoulder-like ring shoulder 24 of width 1 runs in the peripheral surface 11 of the break-out pin 10 as the radial wall of a cross-section 11 of triangular shape and, in Fig. 2, is turned in from the ring shoulder upwards.

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The ring notch 28 in Fig. 4 offers a cross-section Hch of an isosceles triangle to the pin axis A

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When the stripping pin ⁴ - 10 is inserted into the stripping plate made of a wood material, the special design of the tip, which tapers in the driving direction gy ^j ring 2v, creates a high compaction of the wood material (area 30); this is further increased by the ring notches 26, 28.

Claims (8)

H-249.02 EXPECTATIONS Device for processing cardboard sheets p<? or the like in the folding box ifädustrls «sit Ir a« stripping board with stripping pins fixed, by means of which cut pieces or waste parts ?iyas or the like <his &^n level. characterized., that the bolt-like break-out pin (10) tapers conically towards its driving end and forms an annular edge (20) thereon, which surrounds an axial bore (18) of the break-out pin. 2. Device according to claim 1, characterized in that the axial bore (18) is a blind hole, 3. Device according to claim 1 or 2, characterized in that a ring notch (26, 28) is formed in the peripheral surface (11) of the stripping pin (10) at a distance (b) from the ring edge (20). 4. Device according to claim 1 or 2, characterized in that the diameter (e) of the bore (18) corresponds approximately to half the diameter (d) of the stripping pin (10). M-249.02 5. Device according to one of claims 1 to 4, characterized in that the length (a) of the breaking pin ( 10 ) corresponds to approximately two thirds of its diameter (d). 6. Device according to at least one of claims 1 to 5, characterized in that the distance (b) of the ring notch (26, 28) from the ring edge (20) is slightly longer than the length (a) of the conical region (22). 7. Device according to at least one of claims 1 to 6, characterized in that the annular notch (26) ends at a radial annular shoulder (24) towards the conical region. 8. Device according to at least one of claims 1 to 6, characterized in that the annular notch (28) is triangular in cross section and the longest side of the triangle falls into the peripheral surface (11) of the cutting pin (10).