DE9416075U1 - Device for processing perforation combs - Google Patents

Description

Device for processing perforation combs

The invention relates to a device for processing perforation combs.

Perforation combs are used in the processing of continuous paper, in particular to produce cross perforations on paper webs. Perforation combs are standard parts, although they are offered in different designs, i.e. in different sizes and with different pitches. When using such standard perforation combs, it can happen that when creating separating perforations, the paper web is weakened too much in certain areas where weakening is not desired. It can also happen that perforations are created in areas where no perforations are desired. These are, for example, the intersection points of the cross perforation with a longitudinal perforation towards the edge of the hole or the form side edges. Cross perforations in this case

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are undesirable, so the aim is to avoid a transverse perforation across the longitudinal perforation. Furthermore, depending on the distance between the holes, the edges of the holes and the length of the paper, it can happen that a hole in a hole edge (the holes in the hole edge serve to convey the paper web using a pinwheel drive) ends up in the area of a transverse perforation. In this case, it is undesirable for cuts to lead into the hole of the hole. Furthermore, under the same conditions, it can happen that a hole is directly touched by the line of the transverse perforation; in this case, too, cutting through the paper in this area is undesirable.

In order to avoid the local punching mentioned, the combs were previously subsequently processed by hand, i.e. areas of the comb teeth that created punching in the paper web were ground down so that the comb could no longer punch through the paper web in this area. This work is laborious and time-consuming, inaccurate and cannot be reproduced in a series of combs that are to be processed in the same way.

The invention is therefore based on the object of creating a device for processing perforation combs, with which the perforation combs can be processed in a simple, precise and reproducible manner in accordance with the requirements mentioned.

According to the invention, the above object is achieved by a device for processing perforation combs, which is characterized by a clamping device for clamping a perforation comb, with a

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clamped comb with a separating device that can be swung in and out and with an adjustment device for adjusting the separating device in the longitudinal direction of the comb.

A perforation comb is clamped in for processing using the clamping device. The teeth of the perforation comb are processed using the separating device, i.e. the teeth are usually ground down in the desired areas by a small amount, but this is sufficient so that paper perforated by the perforation comb is no longer severed in the processed area. The adjusting device is used to adjust the separating device along the perforation comb in order to be able to process it successively at different points in the desired manner. In a further development of the invention, it is provided that the clamping device has a clamping block with a shoulder for holding a perforation comb and with a clamping plate with a corresponding step, with a spring-loaded clamping lever being provided for clamping the clamping plate against the clamping block. This makes it easy to clamp the perforation comb, which usually has a standard height of 23.8 mm. A stop is provided on the front side of the holder or clamping block against which the perforation comb is pressed so that it always assumes a defined position.

A further development of the invention provides that the cutting device has a rotating cutting disc that is pivotably mounted on a swivel arm, with a pneumatic drive for pivoting the swivel arm and a pneumatic drive for rotating the cutting disc being provided; as a rule, a pneumatic drive is used to pivot the swivel arm and to rotate the cutting disc.

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A common pneumatic drive is used for the disc, with the swiveling being controlled by cylinders and valves.

Further embodiments of the invention provide that the adjustment device has a linear guide for the separating device and the adjustment device is provided with an electric stepper motor for driving a carriage that can be moved along the linear guide and carries the separating device, wherein in particular an electronic control is provided at least for the adjustment device.

The cutting disc is usually 0.5 mm thick; if wider removals are to be made, the cutting device is fed in or moves over the corresponding area.

Further advantages and features of the invention emerge from the claims and from the following description, in which an embodiment is explained in detail with reference to the drawing. In this figure:

Fig. 1 shows a section in the area of the cutting disc through the inventive

Device of Fig. 2;

Fig. 2 is a front view of the device according to the invention. 30

The device 1 according to the invention for processing perforation combs has a base frame 2 with a base plate 3 and a vertical support 4.

On the side of the base plate 3 opposite the vertical support 4, a clamping device 6 for a perforation comb 7 to be processed is arranged parallel to the vertical support 4. The clamping device has a clamping block sitting on the base plate 3

8. The clamping block 8 is provided with a shoulder

9 is provided with a support surface 12 for the perforation comb 7, which is set back from a clamping surface 11. A clamping plate 13 can be clamped against the clamping block 8 by means of a spring-loaded clamping lever 14, clamping the perforation comb 7.

A linear guide 16 is arranged on the vertical support 4, along which a carriage 17 for a separating device 18 can be moved. The carriage 17 is moved by an electric stepper motor 19.

The cutting device has a cutting disk 21 which is pivotably mounted on the carriage 17 by means of a pivot arm 22 in the direction of the double arrow S. Furthermore, a pneumatic motor 23 is provided on the carriage 17 both for pivoting the pivot arm 22 and for rotating the cutting disk 21.

The device according to the invention is controlled by means of an electrical control unit 24, which is preferably programmable and by means of which predefined programs for generating various perforation comb patterns can be selected, either by pressing a key or by inserting data carriers associated with the corresponding perforation comb patterns, such as magnetic cards, diskettes or the like.

Using the device according to the invention, standard perforation combs can be adapted to special requirements in a simple and precisely reproducible manner. The desired program is selected in the manner indicated. The control unit 24 then controls the two drives 19, 23 in the desired manner, i.e. the carriage 17 is initially moved by the electric drive 19 along the linear guide 16 until the cutting disc 21 is at the point where a comb gap is to be provided or widened. The pneumatic drive 23 then pivots the pivot lever with the rotating cutting disc 21 against the comb, which causes material to be removed from the comb, whereby a removal depth of 1/2 mm is fully sufficient with regard to usual paper thicknesses in the order of a few hundredths of a mm (the comb depth of the prefabricated combs is, in contrast, around 5 mm).

0 After this work process has been completed, the cutting disc 21 is swung out of the area of the comb teeth and moved along the linear guide 16 to the next point to be machined, where the same machining process is carried out again in the manner described. This is done at all points on the comb that are to be machined until it is completely machined.

Claims (9)

PATENT VERSION -ing. HEINER LICHTI DlPL-PHYS. DR. RER. NAT. JOST LEMPERT D-76207 KARLSRUHE (DURLACH) PO BOX 410760 DIPL.-ING. HARTMUT LASCH TELEPHONE: (0721)9432815 FAX: (0721) 9432840 Süka 12766.2/94 Le/es Printing and Graphotechnik GmbH 5 October 1994 Akazienweg 9 D-76287 Rheinstetten Protection claims 1. Device for processing perforation combs, characterized by a clamping device (6) for clamping a perforation comb, with a separating device (18) that can be swung in and out of the clamped comb and with an adjusting device (16, 17) for adjusting the separating device (18) in the longitudinal direction of the comb. 2. Device according to claim 1, characterized in that the clamping device (6) has a clamping block (8) with a shoulder (9) for holding a perforation comb and with a clamping plate (13) provided with a corresponding step. 3. Device according to claim 2, characterized by a spring-loaded clamping lever (14) for clamping the clamping plate (13) against the clamping block (8). 4. Device according to one of the preceding claims, characterized in that the separating device (18) has a rotatable separating disk (21) pivotably mounted on a pivot arm (22). 5. Device according to claim 4, characterized by a pneumatic drive (23) for pivoting the pivot arm (22). 6. Device according to claim 4 or 5, characterized by a pneumatic drive (23) for rotating the cutting disc (21). 7. Device according to one of the preceding claims, characterized in that the adjusting device has a linear guide (16) for the separating device (18). 8. Device according to claim 7, characterized in that the adjusting device is provided with an electric stepper motor (19) for driving a carriage (17) which can be moved along the linear guide (16) and carries the separating device (18). 5 9. Device according to one of the preceding claims, characterized by an electronic control at least for the adjustment device (19, 16, 17).