WO1997011902A1

WO1997011902A1 - Device for cutting continuous strips of paper

Info

Publication number: WO1997011902A1
Application number: PCT/EP1996/003152
Authority: WO
Inventors: Peter Hannemann
Original assignee: Böwe Systec AG
Priority date: 1995-09-27
Filing date: 1996-07-17
Publication date: 1997-04-03
Also published as: ES2106711T1; EP0796216A1; CA2205447A1; DE19654984C2; JP2849476B2; JPH09511731A; DE19654986C2

Abstract

Described is a device (100; 300; 500) for cutting a continuous strip of paper (108), the device comprising a paper-feed device (102; 302) which feeds the paper (108) to the cutting device at an essentially constant speed and a cutter (104; 310). Located between the feed device (102; 302) and the cutter (104; 310) is a paper-hold device (106; 502) which restrains the paper (108) so that a position can be defined on the paper (108) at which the cutter (104; 310) cuts it. Also fitted is a buffer device (120; 316) located between the feed device (102; 302) and the hold device (106; 502) and which accommodates the length of paper (108) which accumulates in the form of a loop (170) while the paper (108) is being held. The buffer device (120; 316) comprises a device (122, 124a, 124b; 318, 320) designed to guide the paper which accumulates and a device (124c, 188; 318) designed to damp down oscillations in the accumulating paper.

Description

Device for cutting paper webs

description

The present invention relates to a device for cutting paper webs according to the preamble of claim 1. In particular, the present invention relates to a device for cutting paper webs which form part of a complex paper handling system.

Paper handling systems are mainly used by large companies, banks, insurance companies, service companies, etc. In these companies, the paper handling systems are used to process large quantities of paper, such as, for example, invoices, reminders, bank statements, insurance policies or checks. The individual papers to be handled by such a paper handling system are in many cases produced by high-speed printers which print letters, forms, etc. on a paper web. This paper web is typically fed to the printer from a large supply roll and is fed to the paper handling system after printing. However, before the paper handling system can carry out the corresponding operations for assembling individual papers etc., it is necessary that the paper web printed by the high-speed printer is cut so that individual sheets are fed to the paper handling system. For this purpose, cutting machines are used which have a knife or some other type of cutting device, the paper web to be cut being fed to the knife by means of a paper feed device. These paper handling systems are often designed in such a way that handling different papers with different formats is made possible. This flexibility with regard to the formats used by the paper handling system requires that paper webs can be cut in different formats.

Another important point in paper handling systems is that depending on the control of these handling systems, different numbers of papers are required for the respective processes, that is to say that five additional pages are added to a specific letter, whereas only another page is added to another letter must be added. In order to ensure feeding at a different rate, it is necessary that the cutting machine is not only able to cut different formats, but also to feed them to the paper handling system at different speeds.

The above-mentioned cutting systems, which form part of a complex paper handling system, therefore fundamentally meet different requirements than so-called rotary cutting machines, as are used, for example, in print shops for the production of daily newspapers. Such rotary cutting machines only serve to cut paper webs in a predetermined format. By specifying only one format, it is possible in these machines to drive the paper web to the rotary knife at a constant speed, the drive speed being determined as a function of the fixed format and the rotary speed of the rotary knife. The changeover to a different format is associated with considerable effort in such rotary cutting machines, since the drive speed of the rotary knife and the feed speed of the paper web have to be adjusted depending on the new format. Automatic adjustment of the respective parameters to a new format requires such rotary cutting machines a considerable control effort.

A cutting machine is described in more detail below with reference to FIG. 6, as is used in the prior art for paper handling systems of the type described above. 6a shows a schematic illustration of a known paper cutting machine 600. The cutting machine 600 comprises a paper feed device 602 which is driven by a motor 602a. As can be seen in FIG. 6a, the paper feed device 602 comprises a first drive roller 604 which is driven by the motor 602a at a speed V _j . A feed element, preferably in the form of a feed belt 608 or a feed chain, is guided through the drive roller 604 and a guide roller 606. A paper web 612 extends from a storage area 610 via a redirection and guide device 614 to the feed device 602.

In the cutting machine shown in FIG. 6a, the paper web 612 is provided with a perforated edge, in which evenly spaced holes for guiding and driving the paper web are provided. In order to ensure the driving and guiding of the paper web 612, the guide belt 608 of the feed device 602 has a plurality of teeth 608a which engage with the holes in the perforated edge of the paper web 612. The paper web 612 is fed to a cutting device 616 by means of the feed device 602. The cutting device 616 comprises a so-called drop knife 618, which essentially has the shape of a guillotine. This drop knife is movably guided between two guides 620, 622. The cutting device further comprises a counter cutting edge 624, on which the drop knife 618 moves in the direction perpendicular to the paper web 612 during its cutting movement. The drop knife 618 is actuated by means of a motor 626, which for example comprises a belt drive consisting of a drive roller 628, a guide roller 630 and a Belt 632 drives at a speed V ₂ . At an eccentric position of the guide roller 630, one end of a connecting rod 632 is attached, the opposite end of which is connected to the drop knife 618. In combination with the drive 626, the connecting rod 632 and the guides 620, 622, the drop knife executes a continuous up and down movement when the motor 626 is driven. In the paper running direction after the cutting device 616, a paper discharge device 634 is provided, which serves to move the cut pieces of paper further. This paper discharge device comprises a drive roller 638 actuated by a motor 636. The motor 636 drives the drive roller 638 at a constant speed V ₃ . In general, the speed V _{3 of} the drive roller 638 is higher than the feed speed of the paper web 612, so that a safe removal of the cut papers is ensured. In addition to the drive roller 638, the paper discharge device 634 comprises a guide roller 640, the cut papers moving between the drive roller 638 and the guide roller 640. The guide roller 640 is biased by a spring 642 to press the paper and against the drive roller 638.

The basic operation of the cutting machine described in FIG. 6a is explained in more detail below with the aid of the diagrams shown in FIG. 6b.

At a time t = 0, the motor 602a is driven to drive the feeder 602 so that the paper is accelerated to a speed V _j . At time ^, the predetermined speed V- is reached and is maintained until time t ₂ . When the time t ₂ is reached, a position of the paper web 612 in which to cut is already in the vicinity of the cutting device 616. The drive of the feed device is controlled in such a way that the paper web is braked from time t ₂ 612 takes place so that it is stopped at time t ₃ . As soon as the time t _{3 is} reached the motor 626 is driven and accelerated to the speed V ₂ reached at time t ₄ . This speed is maintained until time t ₅ and the speed is reduced to zero until time t ₆ . During the course of time from t ₃ to t ₆ , the upward and downward movement of the connecting rod 632 results in the cutting movement of the drop knife 618 and the paper web is cut at the desired position. The paper discharge device 634, which is continuously driven by the motor 638 at the speed V ₃ , ensures that the cut paper is transported further. As soon as the time t _{β has been} reached, the control of the speeds described with reference to FIG. 6b begins again and the paper web 612 is fed further in the direction of the cutting device 616 until the corresponding cutting position on the paper web 612 is reached.

With the cutting machines described with reference to FIG. 6a, cutting capacities of up to 25,000 standard forms per hour or cuts per hour with dimensions of the resulting format of 88.9 × 210 mm can be achieved.

A disadvantage of the cutting machine described with reference to FIG. 6 is that its operation requires the constant acceleration of a large mass, namely the paper web. This constant acceleration and deceleration of the paper web does not enable continuous operation . These constant accelerations and decelerations mean that the service life of the components used, in particular of the motors 602a, 626 used, is considerably reduced. The accelerations or decelerations which can be achieved and thus the cutting capacities which can be achieved are also limited by the fact that the edges of the guide holes are torn out or the paper web is torn off in the case of transversely perforated material if the accelerations are too high. Furthermore, the jerky acceleration of the paper mass fed leads to high noise emissions. Another problem that these known cutting machines have is that due to the low paper running speed, which is limited by the constant acceleration and deceleration, the suitability for so-called on-line operation is not given. The term online operation refers to an operating mode in which a paper web is fed to a high-speed printer, this is printed and fed directly to the cutting machine at the speed of the printer.

In the known cutting machines from the prior art, a supply stack 610 is therefore provided, into which finished printed paper webs are introduced by a remote printer and are fed from there to the cutting machine. The low paper running speed also results in an upper limit on the performance of such known cutting machines, which in the currently known machines in the aforementioned approximately 25,000 standard forms per hour or cuts per hour with dimensions of the resulting format of 88.9 x 210 mm.

Another reason for the above-mentioned limitation of the performance of these known machines is that, at outputs of more than 25,000 cuts per hour, there are chaotic phenomena of the paper web which are caused by the constant acceleration and deceleration and which cannot be suppressed technologically or are to be controlled.

Paper handling systems are already known in the prior art which continuously feed a paper web to be cut to a knife without stopping the paper web when cutting it.

DE-OS 2165194 relates to a method and a device for feeding material to sheet processing and sheet processing. processing machines. A material web is fed from a roll of material to a knife cylinder by means of a pull section. The material web is cut in such a way that the material web is held on the knife cylinder by means of suction devices when reaching the knife cylinder and a so-called waste strip is first cut off and the front edge of the material web thus produced, which is still held by the suction device, is turned by rotating the measurement device passed to a guide cylinder. The front edge of the material web is held on the guide cylinder during a further rotation of the cylinder and conveyed at the web speed until the material web reaches a cutting area in which an arc is cut by the knife. During operation, a loop is formed between the material roll and the knife, which is built up during the cutting process and is dismantled again after cutting.

DE-PS-723878 relates to a conveyor device for webs, in particular paper webs, on cross cutters and folding machines. A paper web is fed evenly to a knife via rollers, a suction stamp being arranged between the knife and the rollers, which holds the paper web so that paper is not conveyed further in the direction of the knife. This holding action creates a loop due to the continuously fed paper.

However, the paper handling systems described above, which continuously feed a paper web to be cut during the cutting process, have a considerable problem with regard to the cutting accuracy as soon as the speed of the paper feed exceeds a certain value. It was found that the cutting accuracy, the tolerances of which are in the tenths of a millimeter range, depend on the design of the paper loop. From a paper feed speed that is greater than 0.8 m / s, the loop shows a behavior that is no longer reproducible. This no longer reproducible behavior of the loop leads to unacceptable fluctuations in cutting accuracy.

Based on the prior art described above, the present invention has for its object to provide a device for cutting paper webs that have a significantly higher performance, can be realized in a simple and inexpensive manner and even at high Paper feed speeds have a high cutting accuracy.

This object is achieved by a device according to claim 1.

The present invention provides a device for cutting paper webs with a paper feed device which feeds the paper web to be cut at an essentially constant speed; a cutting device; a paper delay device which is arranged between the paper feed device and the cutting device and which delays the paper web fed in such a way that a position is fixed on the paper web at which the cutting device performs the cutting of the paper web; and a buffer device which is arranged between the paper feed device and the paper delay device in order to take up a running length of the paper web in the form of a loop during the deceleration of the paper web; wherein the buffer device comprises a device for guiding the accumulated paper web and a device for damping vibrations of the accumulated paper web.

The present invention is based on the knowledge that by arranging a buffer device arranged between the paper feed device and the cutting device, which takes up the length of the paper web that has run up during the deceleration of the paper web and at the same time the formation of a loop of the run-up paper web controls and dampens the vibrations of the loop, leads to a reproducible loop behavior which enables high cutting accuracy even at high paper feed speeds.

An advantage of the present invention is that the paper web can be fed at an essentially constant speed if the paper web is briefly decelerated to determine the position at which the cutting is to take place.

The advantage of the present invention is that due to the uniform feeding speed of the paper web, constant acceleration and deceleration of the paper web is no longer necessary, so that there is no need to constantly switch the motors on and off, which in turn leads to a significant reduction Increases the lifespan of these motors and other components leads.

A further advantage of the present invention consists in the fact that the device according to the present invention can be run at a double paper running speed compared to the paper running speed in machines from the prior art. This leads to a doubling of the performance, which can be 50,000 cuts per hour in devices according to the present invention.

Yet another advantage of the present invention is that by feeding the paper web at a constant speed, the device according to the present invention can be operated in a continuous mode, which means that it is directly connected to the outlets can connect a high-speed printer, so that the rearrangement and intermediate storage of the paper web is eliminated.

Preferred developments of the present invention are defined in the subclaims.

Preferred exemplary embodiments of the present invention are explained in more detail below with reference to the accompanying drawings. Show it:

1 shows a first exemplary embodiment of the device according to the invention;

1A shows an enlarged illustration of an exemplary embodiment of the buffer device;

FIG. IB shows a top view of the buffer device from FIG. 1A;

FIG. 2 shows the drive elements for the exemplary embodiment shown in FIG. 1; FIG.

3 shows a second preferred exemplary embodiment of the present invention;

Fig. 4 is an illustration of the drive elements for the embodiment shown in Fig. 3;

Fig. 5 shows a third preferred embodiment of the present invention; and

Fig. 6 is an illustration of a cutting machine according to the prior art.

1, a first preferred exemplary embodiment of the present invention is described in more detail below.

1 shows a cutting machine 100 according to the present invention.

The cutting machine 100 according to the invention comprises an guiding device 102, a cutting device 104 and a paper delay device 106 arranged between the feeding device 102 and the cutting device 104. The paper feeding device 102 feeds a paper web 108 at an essentially constant speed. The paper delay device 106 delays the feeding of the paper web 108 to the cutting device 104 such that a position is fixed on the paper web 108 at which the cutting device 104 performs the cutting of the paper web. The direction of paper travel is illustrated by arrow 110.

The cutting machine 100 shown in FIG. 1 is a first preferred exemplary embodiment of the present invention which, in accordance with this preferred embodiment, comprises further components and elements. These are described in detail below.

The paper web 108 can be fed, for example, from a high-speed printer (not shown). The feed takes place via a deflecting and guiding device 112. In the embodiment shown in FIG. 1, the paper web 108 is provided with a perforated edge , in which uniformly spaced holes are arranged, by means of which the paper web is driven and guided. The feed device 102 comprises a drive roller 114, a guide roller 116 and a feed element 118 guided by the drive roller 114 and the guide roller 116. The element 118 is provided with a plurality of teeth 118a which are in contact with the perforated edge of the paper web 108 arranged holes engage and guide and drive the paper web 108 in this way.

A buffer device 120 is provided between the feed device 102 and the paper delay device 106, which serves to accommodate the length of the paper web that runs up during the delay of the paper web by the delay device. A first preferred embodiment Example of the buffer device is described in more detail below with reference to FIGS. 1, 1A and 1B.

As can be seen in FIG. 1, the buffer device comprises a lower guide device 122, which is referred to as a bottom plate, and an upper guide device, which consists of two guide plates 124a and 124b. The paper web 108 to be cut moves between the lower and the upper guide device. Furthermore, the buffer device 120 comprises a cover 124c. Arranged on the lower guide device 122 are two nozzles 126a, 126b, through which air preferably exits. The nozzles are provided in order to blow air between the paper web 108 and the lower guide device 122, while the paper retarding device 106 delays the travel of the paper web 108, so that the paper web 108 rises evenly without causing undesirable warping or buckling of the paper web 108 comes. The nozzles 126a, 126b can be controlled in such a way that they are only active during the activation of the delay device and are not activated during the movement of the paper web 108 by the delay device 106.

The function of the lower and upper guide device and the hood is described below with reference to FIG. 1A, in which the same elements are provided with the same reference numerals. The illustration of the nozzles was omitted in FIG. 1A in order to maintain the clarity of the illustration.

The lower guide device 122 ensures that the paper web 108 is properly fed in the direction of the delay device or cutting device during the time during which no delay occurs. As can be seen in FIG. 1A, the lower guide device 122 is formed by a base plate, which is angled with respect to the plane of the paper feed, around the paper web 108 entering the buffer device 120 from the bottom Deflect the plane of the paper feed, which causes the formation of a loop. The bottom plate 122 is provided with a plurality of recesses 172 through which air, which is emitted by the nozzles (FIGS. 1, 126a and 126b), is introduced into the region between the bottom plate 122 and the paper web 108. This supports the formation of the loop 170 in addition to the effect of the angled bottom plate 122.

The upper guide device 124 serves to ensure that, in the case in which the paper web 108 bears against the upper guide device 124 due to the air blown in, the paper web 108 is securely guided to the upper guide device 124 by the upper guide device 124 Paper delay device can be performed. The upper guide device comprises a first guide plate 124a and a second guide plate 124b. The guide plates 124a, 124b each comprise a first section 174a, 174b, which are arranged at an angle with respect to the paper feed direction (arrow 176). As indicated by arrows 178, the angle at which the first sections 174a, 174b are arranged is adjustable. Furthermore, the guide plates 124a, 124b each comprise second sections 180a, 180b, which extend essentially parallel to the paper feed direction 176 and are connected to the first sections 174a, 174b. The guide plates 124a, 124b are fastened on the second sections 180a, 180b to fastening devices 182a, 182b. According to one exemplary embodiment, the fastening devices 182a, 182b are designed as lockable bearings in order to effect the angular adjustment of the first sections 174a, 174b. As can be seen in FIG. 1A, the second sections 180a, 180b of the guide plates 124a, 124b are arranged in order to form an inlet section 184 and an outlet section 186 of the buffer device 120 together with the bottom plate 122 .

As shown in FIG. 1, according to another exemplary embodiment, the second guide plate 124b of the buffer device 120 can be attached to the one guide device 136a of the paper delay device.

In the exemplary embodiment shown in FIG. 1A, the cover hood 124c is fastened to the second sections 180a, 180b of the guide plates 124a, 124b. As a result, an air chamber 188 is formed in which the vibrations occurring at high paper feed speeds during loop formation are damped. The hood 124c is also used for sound absorption.

The above-described configuration of the buffer device 120 makes the behavior of the loop 170 reproducible at high paper feed speeds, for example above 0.8 m / s, so that there is no negative influence on the cutting accuracy. The tolerances of the cutting accuracy can thereby be maintained and there are no incorrectly cut sheets of paper.

IB shows a partial top view of the buffer device 120 without a hood. The same elements are provided with the same reference symbols, the reference symbol 190 denotes a lower cover or support structure of the buffer device 120.

In the following, reference is again made to FIG. The paper delay device 106 comprises a stamp member 128 which is held in a stamp member receiving device 130. The paper delay device 106 further comprises a counter stamp 132, the paper web 108 being passed between the stamp 128 and the counter stamp 132. The stamp 128 is connected to a piston 134 via the stamp member receiving device 130. The piston 134 is guided in a guide device 136a, 136b. The piston 134 is preloaded by a spring 138 such that the spring force is effective in order to separate the punch 128 from the counter punch 132. The piston is on one End facing away from the stamp with a roller 140. The actuation of the plunger, ie its movement against the counter-plunger 130, takes place by means of a cam disk or camshaft 142 which is connected to the roller 140. The camshaft 142 comprises a first part 142a which causes the plunger 128 to be pressed against the counter-plunger 132 when the roller 140 is connected to this region 142a. If the roller 140 is located in a second region 142b of the cam plate 142, the stamp 130 is separated from the counter-stamp 132 by the spring force exerted by the spring 138.

In other words, this means that the paper is decelerated while the roller 140 is in the area 142a of the cam plate 142 and that no deceleration is exerted on the paper while the roll 140 is in the area 142b of the cam plate 142 located.

A guide device 144 is arranged between the paper delay device 106 and the cutting device 104 and has a drive roller 146 and a guide roller 148, between which the paper web 108 is guided. The guide roller 148 is biased by a spring 150 against the drive roller 146. The transport speed of the guide device 144 is several times higher than the transport speed of the feed device 102. This ensures that the loop that has accumulated during the deceleration process is removed again by the next clamping cycle.

In the exemplary embodiment shown in FIG. 1, the cutting device 104 comprises a drop knife 152 which is guided between two guide devices 154, 156. The knife 152 can be designed in the form of a guillotine knife and is arranged essentially perpendicular to the direction of paper travel. The paper web 108 to be cut is guided between the knife 152 and a shear bar 158. The cutting machine 100 further comprises a paper guide device 160, which is arranged in the paper running direction after the cutting device 104. The paper discharge device 160 comprises a drive roller 162 and a guide roller 164, between which the cut paper is guided. The roller 164 is biased against the drive roller by means of a spring 166. A horizontal guide device 168 is provided in order to ensure reliable guiding of the cut paper from the cutting device 104 to the paper discharge device.

It is pointed out that the paper discharge device 160 transports the paper away at a higher speed than is fed by means of the feed device 102. The speeds of the paper guide devices 144, 160 are approximately the same. This ensures that the cut papers are safely transported away from the cutting machine 100.

The paper web 108 can, for example, be printed on one or on both sides by a printer device (not shown). The printer device is located in front of the paper feed device 102 with respect to the paper running direction.

In the embodiment shown in FIG. 1, the knife 152 arranged in the cutting device 104 is, for example, a falling knife. In the case of using a drop knife, the paper delay device 106 is controlled in such a way that the paper web 108 is completely stopped during the cutting by the action of the stamp 128 on the paper web 108.

The drive elements of the components described in FIG. 1 are explained in more detail below with reference to FIG. 2. It is pointed out that the same reference numerals are used in FIG. 2 for the same components or components. As can be seen in FIG. 2, the feed device 102 comprises a motor or drive 200 which is operatively connected to the drive roller 114 of the feed device 102 in order to drive it at a constant speed.

Furthermore, the drive system for the cutting device 104 and the paper delay device 106 is shown in FIG. 2. As can be clearly seen, these two devices are driven by a drive 202. Motor 202 is operatively connected to a drive roller 204 which, for example, drives a belt 206 which in turn drives a cutter drive roller 208 and a paper retarder drive roller 210. A connecting rod 212 is attached at one end to an eccentric position of the cutter drive roller 208. The end of the connecting rod opposite the end of the connecting rod 212 fastened to the drive roller 208 is connected to the falling sea of the cutting device, so that the rotation of the drive roller 208 causes the falling knife to move up and down. The decelerator drive shaft 210 is connected to and drives the cam 142, thereby causing the plunger to move up and down.

As can be clearly seen from the drive system for the cutting device 104 and the paper delay device 106 from FIG. 2, the system shown there is designed such that the paper web 108 is simultaneously stopped by the paper delay device 106 during the cutting.

However, it is pointed out that other drive configurations are also possible, in which the cutting device 104 and the paper delay device 106 each have their own drive devices or motors, which are synchronized with one another via a corresponding control device. FIG. 2 also shows the drive system of the guide device 144 and the paper discharge device 160. This system comprises a motor 214 which is operatively connected to the drive roller 162, which in turn is connected to the drive roller 146 of the guide device 144 via a belt 216. The motor 214 drives both the drive roller 162 and the drive roller 146.

In the cutting machine described with reference to FIGS. 1 and 2, the paper web 108 to be cut is fed in accordance with the desired format depending on the control of the individual motors 200 and 202. The control is carried out in such a way that it is ensured that the printed one, for example Paper web is cut according to the desired format.

According to one exemplary embodiment of the present invention, a so-called format detection device can be arranged in front of the paper feed device with respect to the paper running direction, as is known per se in specialist circles. This format detection device controls the respective drives 200 and 202 of the paper feed device, the paper delay device and the paper cutting device in such a way that the paper web is cut in accordance with the predetermined format.

Again, according to a further exemplary embodiment, a detection device can be arranged adjacent to the paper delay device 106, which detects predetermined markings on the paper web 108 in order to control the paper delay device 106 and the cutting device 104 in this way as a function of the detection of this marking that the paper web is cut according to the predetermined format.

The detection device arranged adjacent to the delay device 106 can, for example, be an optoelectrical tronic transducer, which can detect the corresponding markings on the paper web.

A second preferred exemplary embodiment of the present invention is described in more detail below with reference to FIG. 3.

It is pointed out that the same components and components already described with reference to FIG. 1 have the same reference numerals and a renewed description of these is omitted.

3 shows a cutting machine 300 with a feed device 302, which consists of a drive roller 304 and a guide roller 306. The guide roller 306 is biased against the drive roller 304 by means of a spring 308. The paper web 108 is guided and driven between the drive roller 304 and the guide roller 306 of the feed device 302. The feed device 302 shown in FIG. 3 is used for paper webs that do not have a perforated edge section with provided guide and drive holes.

The cutting machine 300 according to the exemplary embodiment shown in FIG. 3 comprises a cutting device 310, which is designed there as a rotary knife. The Rotationsmeεεer comprises a roller 312 to which a blade 314 is attached. It is pointed out in this connection that the rotary knife can have different configurations. In one case, the blade 314 can be arranged at a fixed angular position of the roller 312, and together with the counter cutting edge 158 by a corresponding shaping of the blade and the counter cutting edge, as is known per se in specialist circles, a scissor effect on the one to be cut Exercise paper web. It is necessary for the paper delay device 106 to stop the paper web completely during the cutting. A further embodiment of the rotary knife can be such that the blade 314 is not attached to a fixed angular position of the roller 312, but rather extends continuously from a first angular position to a second angular position. It is further necessary that the paper delay device 106 stops the paper web only for fixing the position at which the cut is to be made, and then enables the paper web 108 to move on at a speed which is equal to the speed of rotation of the rotary knife is adapted so that a cutting edge is established which is perpendicular to the direction of travel of the paper web. The further transport of the paper web from the paper delay device to the cutting device takes place by means of the guide device 144, which ensures that the speed described above is adjusted in order to bring about the straight cut. A difference compared to the feed speed of the paper web into the cutting machine 300 is compensated for by the buffer 102 provided.

In the embodiment shown in FIG. 3, the buffer 120 has a different configuration than the exemplary embodiment shown in FIG. 1. In contrast to the exemplary embodiment in FIG. 1, the buffer device 316 comprises a lower guide device 318 for receiving the loop, which is formed by the paper running up there. Furthermore, a one-piece upper guide device 320 is provided, which is provided with two nozzles 322a, 322b, which, in the case in which the delay device 106 delays the paper web, air in the direction of the lower guide device 318 between the upper guide device 320 and blow in the paper web 108 so that the paper web 108 moves in the direction of the lower guide device 318. This ensures that no undesirable warping or kinking of the paper web occurs during the deceleration of the paper web. The effect of the buffer device shown in FIG. 3 is the same as that which is achieved with the buffer device from FIG. 1. On- Instead of the hood used in FIG. 1, the enclosed air space is determined by the lower guide device 318 in this exemplary embodiment. Furthermore, the angular position of the lower guide device cannot be adjusted.

The lower guide device 118 and the upper guide device 320 act at their one end, which is arranged adjacent to the feed device 302, and at their other end, which is arranged adjacent to the delay device 106, as common guides for the paper web, in order to ensure a proper feed to the delay device 106 or a proper continuation from the feed device 302.

It is pointed out that the feed device 302 and / or the buffer device 316 illustrated with reference to FIG. 3 can be used in the same way in the embodiment described with reference to FIG. 1 if this is desired. The use of the feed device 302 from the second exemplary embodiment in the first exemplary embodiment is particularly desirable if a paper web is also used there that does not provide any perforation on the edge.

A possible drive configuration for the second preferred exemplary embodiment of the present invention shown in FIG. 3 is explained in more detail below with reference to FIG. 4.

The feed device comprises a drive or motor 400 which is operatively connected to the drive roller 304 in order to drive it at a predetermined speed. The drive roller 304 additionally comprises a further roller 402, around which, for example, a drive belt 404 leads to a further roller 406, which is connected to the drive roller of the guide device 144. The two rollers 402 and 406 are selected such that a predetermined one Set translation so that the guide device 144 is driven at a higher speed than the feed device 302. The roller 406 is connected to a further roller 408, which is connected via a further belt 410 to the drive roller 162 of the paper discharge device 160, εo that the paper discharge device is driven at the same speed as the guide device 144.

As was already described in the first exemplary embodiment, the deceleration device 106 and the cutting device 310 are also driven together by a motor 412. The motor 412 drives a drive roller 414 via which the cam disk of the deceleration device 106 is driven by means of a belt 416 and at the same time the rotary knife is driven.

With regard to the control and possible other controls, reference is made to the corresponding description for FIG. 2. The examples given there can be applied in the same way to the second exemplary embodiment of the present invention.

A third preferred exemplary embodiment of the present invention is described in more detail below with reference to FIG. 5.

Elements which have already been described with reference to FIG. 1 are provided with the same reference symbols and a renewed description is omitted.

The cutting machine 500 shown in FIG. 5 differs from the cutting machine shown in FIG. 1 in that the paper delay device 502 has a different design. The paper delay device 502 comprises a stamp 504 which is held in a stamp receiving device 506. The paper delay device 502 further includes one Counter-punch 508, to which the upper guide device 124 of the buffer device 120 is fastened in such a way that it extends along the surface of the counter-punch 508, which lies opposite the punch 504, so that the punch 504, when actuated, pushes the paper web 108 against a section the upper guide of the buffer device presses. The stamp 504 is connected via the stamp receiving device 506 to a lever arm 510 which is rotatably attached to the end 512 remote from the stamp 504. The lever 510 comprises a roller 514 which runs on a cam disc 516. This cam disc has a first section 516a and a second section 516b. If the roller 514 runs along the section 516a of the cam disc 516, the stamp 508 presses the paper web 108 against the counter-stamp 508 or against the section of the upper guide device of the buffer 120 which is fastened to the counter-stamp 508. When the roller 514 moves along the portion 516b of the cam, a spring force exerted by a spring 518 on the end of the lever 510 to which the stamp is attached means that the stamp does not act on the paper web 108, ie that it does not delay ¬ tion of the paper web causes.

It is pointed out that, in the exemplary embodiment of the present invention illustrated with reference to FIG. 5, instead of the feed device 102, the feed device 302, which was described with reference to FIG. 3, can be used if the device shown in FIG. 5 cutting device 500 shown is to cut a paper web 108 that has no perforation at the edge.

Furthermore, instead of the cutting device 104 shown in FIG. 5, the cutting device 310 shown in FIG. 3, which uses a rotary knife, can also be used.

The cutting machine 500 is not limited to the use of the buffer 120 shown in FIG. 5, but can the buffer 316 shown in FIG. 3 can also be used.

With regard to the drive of the individual components and the possibilities for recognizing the corresponding formatting to be produced by the cutting machine, reference is made to the explanations for FIGS. 1 and 2, which apply in the same way to the cutting machine 500.

Some performance parameters of a cutting machine, as described, for example, with reference to FIG. 1, are given below.

The cutting machine 100 described with reference to FIG. 1 has a performance of 50,000 cuts per hour, with dimensions of the resulting format of 88.9 × 210 mm. This corresponds to about 14 cuts per second. The constant paper feed speed in such a cutting machine is 1.23 m / s or 243 ft./min.

The meter drive speed is 830 rpm, the feed roller speed is 485 rpm and the speed of the removal roller is 3450 rpm, which corresponds to approximately 4 m / s.

The cutting machine 100 has a cycle time of 72 ms, a punch clamping time of approx. 45 ms, which results in a loop with a length of 56 mm, and a punch opening time of approx. 27 ms.

Claims

1. Device (100; 300; 500) for cutting paper webs (108) with

- a paper feed device (102; 302) which feeds the paper web (108) to be cut at an essentially constant speed;

- a cutting device (104; 310);

- A paper delay device (106; 502) which is arranged between the paper feed device (102; 302) and the cutting device (104; 310) and which delays the fed paper web (108) in such a way that a position is set on the paper web (108) at which the cutting device (104; 310) performs the cutting of the paper web (108); and

- A buffer device (120; 316), which is arranged between the paper feed device (102; 302) and the paper delay device (106; 502), in order to keep a running length of the paper web (108) in the position during the delay of the paper web (106) Take the form of a loop (170);

characterized,

that the buffer device (120) comprises a device (122, 124a, 124b; 318, 320) for guiding the accumulated paper web and a device (124c, 188; 318) for damping vibrations of the accumulated paper web.

2. Device according to claim l, characterized in that

that the guide device has a lower guide device in the form of a base plate (122) angled with respect to the paper feed direction (176), that comprises a plurality of recesses (172), one or more air nozzles (126a, 126b) a side of the bottom plate (122) facing away from the paper web (108) are arranged.

3. Device according to claim 2, characterized in

that the guide device comprises an upper guide device with a first guide plate (124a) and a second guide plate (124b), each of which has a first section (174a, 174b), which is arranged at an angle to the paper feed direction (176), and each have a second section (180a, 180b) which is arranged essentially parallel to the paper feed direction, the angle at which the first sections (174a, 174b) are arranged being adjustable.

4. Device according to one of claims 1 to 3, characterized in

that the damping device is formed by a hood (124c) which encloses the guide device and forms an air chamber (188).

5. The device according to claim 1, characterized in

that the guide and the damping device are formed by an upper guide device (320) and by a lower guide device (318).

6. Device according to one of claims 1 to 5, characterized in that the paper delay device (106; 502) has a stamp device (128; 504) which acts on the paper web (108).

7. Device according to one of claims 1 to 6, characterized in

that the cutting device (104) comprises a drop knife (152) which is arranged substantially perpendicular to the paper web (108) to be cut.

8. The device according to claim 7, characterized in that

that the paper delay device (106; 502) stops the paper web (108) completely.

9. Device according to one of claims 1 to 6, characterized in that

that the cutting device (310) comprises a Rotationεmeεser (314).

10. The device according to claim 9, characterized in

that the paper delay device (106; 502) stops the paper web completely.

11. Device according to one of the preceding claims, characterized in that

that the paper web (108) is provided with guide perforations; and

that the paper feed device (102) comprises a tractor device (118, 118a) for guiding the paper web (108).

12. Device according to one of the preceding claims, characterized in that

that the paper web (108) to be cut is printed on at least one side.

13. The apparatus according to claim 12, characterized by

a printer device which is arranged in front of the paper feed device (102; 302) with respect to the paper running direction in order to print on the paper web (108).

14. Device according to one of the preceding claims, characterized by

a paper discharge device (160) which is arranged behind the cutting device (104; 310) with respect to the paper running direction in order to pass on the cut individual papers.

15. The apparatus according to claim 14, characterized in

that the paper discharge device (160) removes the cut individual papers at a higher speed than the speed at which the paper feed device (102; 302) feeds the paper web (108).

16. Device according to one of the preceding claims, characterized in that

that the cutting device (104; 310) and the paper delay device (106; 502) have a common drive (220; 412).

17. Device according to one of the preceding claims, characterized in that that a format recognition device is arranged in front of the paper feed device (102; 302) with respect to the paper running direction, said device recognizing the respective drives (200, 202; 400, 412) of the paper feed device (102; 302), the paper delay device (106; 502) and controls the paper cutting device (104; 310) in such a way that the paper web (108) is cut according to a predetermined format.

18. Device according to one of claims 1 to 16, characterized in that

that a detection device is arranged adjacent to the paper delay device (106; 302), which detects predetermined markings on the paper web (108) in order to, depending on the detection of these markings, the paper delay device (106; 302) and the cutting device (104; 310) to be controlled in such a way that the paper web (108) is cut in accordance with a predetermined format.

19. The apparatus according to claim 18, characterized in

that the detection device detects an optoelectronic device.