EP0424874A2 - Method and means for reducing discards in rotary printing machines - Google Patents

Abstract

To reduce discards as a result of deviations from the cutting register resulting from changes in the tension of the paper web, the individual partial paper webs (9.1 to 9.8) are grouped together to form one or more sections (16, 17). Before it enters a section cross-cutting device (19) of a folder (58), the route of the sections (16, 17) is continuously lengthened or shortened in accordance with the anticipated deviations in the cutting register.

Description

The invention relates to a method for reducing waste in a web-fed rotary printing press and a device for carrying out the method.

A device for measuring and controlling the paper web tension in a web-fed rotary printing press is known from DE-OS 22 11 598.

Air-swept turning bars are e.g. B. made known by DE-GM 87 00 513.1.

DE-OS 35 15 626 shows a paper web guide through a web-fed rotary printing press, in which a paper web is cut into several paper strands. DE-OS 35 15 626 also shows devices for setting the longitudinal register of the paper web strands and a device for regulating the cutting register in the folding unit.

DE-OS 38 11 909 shows a superstructure over a folder with a plurality of turning bars and longitudinal register rollers. These serve to adjust the cutting register to the large number of paper web strands.

The invention has for its object to provide a method and an apparatus for performing the method, with which it is possible to reduce the amount of waste due to faulty cut register, which is caused by brief changes in paper web tension.

This object is achieved by the method or the subject of the characterizing part of claims 1 and 2.

The advantages that can be achieved with the invention are, in particular, that the waste can be further reduced by faulty cut registers without the need for complicated devices.

• Fig. 1 eine Seitenansicht eines Überbaues eines Falzapparates mit der erfindungsgemäßen Einrichtung zum Vermindern der durch fehlerhafte Schnittregister verursachten Makulatur,
• Fig. 2 eine Ansicht II von Fig. 1,
• Fig. 3 eine erfindungsgemäße Einrichtung zur Auslenkung der Stränge von ihrer vertikalen Laufrichtung in eine horizontale Laufrichtung.

An embodiment of the invention is shown in the drawing and will be described in more detail below. Show it

• 1 is a side view of a superstructure of a folder with the device according to the invention for reducing the waste caused by faulty cut registers,
• 2 is a view II of FIG. 1,
• Fig. 3 shows an inventive device for deflecting the strands from their vertical running direction in a horizontal running direction.

It has long been known that paper web tension fluctuations also lead to cut register fluctuations. The fluctuations in the cutting register must not exceed a specified tolerance in order to result in non-printed waste. Changes in paper web tension occur e.g. B. inevitably when changing roles. When changing roles As is well known, a new paper web is glued to the old paper web entering the web-fed rotary printing press. During this process, the paper web tension decreases, especially because the upper windings of the new paper web are loose. In particular in rotogravure printing machines, in which very wide paper webs are often printed, the paper web is cut lengthways into a plurality of partial paper webs with its large number of turning bars and longitudinal register devices before printing into the superstructure. These partial paper webs are combined in one or more strands of paper. The paper strands are cut individually or together to form signatures and then longitudinally and / or cross-folded into products.

When they run into the folder, the partial paper webs run over turning bars with compressed air. Now lets the web tension, e.g. B. by the roll change process, then the compressed air of the turning bars pushes the partial paper web away from the turning bar, i.e. at least the path that the partial paper webs have to travel from the slitter to the cross-cutting rollers in the folding unit becomes longer, and so will that Remove the cutting register from the setpoint. The paper web tension drops during the roll change process - and thus the change in the cutting register - occurs almost suddenly and decreases, depending on how many turns are loosened and how strongly on the new roll. These cutting register changes have to be done from the aspect be considered that the modern web-fed rotary printing machines with paper web speeds of 15 m / sec. to run.

According to the z. B. from the initiation of the roll change the paper web tension continuously measured before entering the slitter, and according to these measured values the path of the paper strand is lengthened or shortened by means of a paper strand longitudinal register device. At the end of the roll change process, when the paper web tension has normalized again, the paper strand longitudinal register device again reaches a waiting position and is switched off, so that the cutting register is only controlled or controlled via the paper web longitudinal register device or the partial web cutting register adjusting devices. be managed.

However, it is also possible within the scope of the invention to continuously measure the cutting register on the strand by means of cutting register marks and cutting register reading heads reading it and an electronic strand cutting register control and actuating device in order to generate setpoint values which are synchronized with the strand cross-cutting cylinder. Determine deviations. Since these resulting setpoint deviations are recognized early, because the size of the cutting register deviation can be predicted via the measuring heads 10.1, 10.2 or strain gauges, it is possible to actuate the strand cutting register device 18 at an early stage in such a way that the cutting register error is as small as possible.

From a web-fed printing press, not shown, e.g. B. a rotogravure rotary printing machine, runs a printed, z. B. form cylinder width (= full width), paper web 1 in a known main cutting register device 2. It essentially consists of two full-width paper guide rollers 3, 4 mounted in side frames and a horizontally or vertically movable register roller 6. The electric motor for shifting the register roller 6 is connected in a known manner to an electronic cut register control.

Coming from the main cutting register device 2, the paper web 1 arrives via controlled pulling rollers 7 in a longitudinal slitting unit 8 known per se, in which the paper web 1 in z. B. eight equal width partial paper webs 9.1 to 9.8 (= partial webs) is cut lengthways. After the slitter 8, the partial webs 9.1 to 9.8 pass through a second pulling device 11 before they are individually guided in a known manner via a folding device superstructure 14 via air-turning turning bars 12.1 to 12.8 and partial web cutting register devices 13.1 to 13.8 and deflecting rollers 15 assigned to them .

The individual partial webs 9.1 to 9.8 are combined in one or two opposing strands 16 and 17. The strand 16 in the example of the invention consists of the “superimposed” partial webs 9.1 to 9.4 and the strand 17 consists of the “superimposed” partial webs 9.5 to 9.8.

These two strands 16 and 17 run into a strand cut register device 18, the strand cut register device 18 according to the invention - viewed in the strand running direction - between the location 10.1, 10.2, from which the partial paper webs 9.1 to 9.8 are formed on the strand 16, 17 is, and the longitudinal cutter 8 and is arranged in front of a strand cross-cutting device 19.

One strand register device is arranged for each strand 16, 17. There can also be only one strand, but also more than two strands.

The strand cut register device 18 consists, for. B. from upper strand deflection rollers 21, 22, lower strand deflection rollers 23, 24 and from between 21, 22 and lower strand deflection rollers 23, 24 arranged, horizontally displaceable strand register rollers 26, 27th

The strand deflection rollers 21, 22 and 23, 24 are rotatably mounted in two side frames 28, 29 and extend horizontally and parallel to the width of the strand 16 and 17. The strand deflection rollers 23, 24 also extend horizontally and parallel to the width of strand 16 or 17.

The side frames 28, 29 are positively connected to the folder side frames.

If a plurality of strands 16, 17 are present, as in the exemplary embodiment of the invention, the strand register rollers 26, 27 are expediently combined immediately or in succession and then at short time intervals moved horizontally together. In the example according to the invention, the strand register rollers 26 and 27 are each rotatably mounted in bearing blocks 31, 32 and 33, 34 for this purpose. The bearing blocks 31, 33 are mounted on a first threaded spindle 36 via their threaded bore, the bearing blocks 32, 34 are supported on a second threaded spindle 37 via their threaded bore. A bevel gear 38 is wedged onto a left end of the threaded spindle 36, and a bevel gear 39 is wedged onto a left end of the threaded spindle 37. The right ends of the threaded spindles 36, 37 are rotatably mounted in supports 41 and 42 fixed on the side frame (side frame 27, 28).

The bevel gears 38 and 39 are rotatably supported by their flanges 43 and 44 in a front 46 and rear support frame 47. A synchronous shaft 48 is rotatably mounted in the support frames 46 and 47. Two bevel gears 49, 51 are keyed onto them. Bevel gear 49 meshes with bevel gear 38, bevel gear 51 with bevel gear 39. At a front end 52 of the synchronous shaft 48 is a reversible electric motor 53, z. B. flanged a stepper motor.

The strand 16 loops around the strand deflecting rollers 21, 23 and the right strand register roller 26, the strand 17 around the strand deflection rollers 22, 24 and the left strand register roller 27. Since the strand register rollers 26 and 27 e.g. B. horizontally and synchronously shifted, the path for strands 16 and 17 is extended when the strand register rollers 26 and 27 are moved while touching strands 16 and 17 to the right. If the strand register rollers 26 and 27 are moved to the left, the path for the strands 16 and 17 is shortened until the Strands 16 and 17 come out of contact with the strand register rollers 26 and 27.

After leaving the strand cut register device 18, the strands 16; 17 in a known manner via pairs of pull rollers 54, 56, 57 and a pair of guide rollers 20 into a strand cross-cutting device 19 of the folder 58, the strands 16, 17 being placed on top of one another, being pulled together by the pull roller 57.

Between the location 10.1, 10.2 and the strand cut register device 18 there is a known cut mark reading head 59; 61 mounted, which the cutting register marks on the strand 16; 17 reads. 16; 17 a read head 59; 61 be arranged. In this case, each strand register roller 26; 27 individually movable and not together as in the exemplary embodiment.

The one or more reading heads 59, 61 cooperate in a known electronic control and setting device 62, which control the one or more electric motors 53 of the strand cutting register device 18 in accordance with the strand cutting register deviation. To synchronize the strand cutting register control and actuating device 62, a synchronized pulse generator 63 interacts with it, which is mechanically coupled to a knife cylinder of the strand cross-cutting device 19.

Cut mark reading heads 64.1 to 64.8 can also be provided for the partial paper webs 9.1 to 9.8, which are connected to an electronic partial paper web control and setting device 65. A synchronized Pulse generator 66 is operatively connected to the device 65 and is coupled to the knife cylinder of the strand cross-cutting device 19.

Instead of the strand cut register mark evaluation, whereby strand cut register marks and partial paper web cut register marks are identical, the strand cut register device (s) 18 can also be regulated or controlled via the deviation of the paper web tension from a desired value.

• 1. Verfahren zum Vermindern von Makulatur infolge von unzulässig großen Schnittregisterabweichungen in einer Rollenrotationsdruckmaschine, das gekennzeichnet ist dadurch, daß ein oder mehrere aus mehreren Teilpapierbahnen 9.1 bis 9.4; 9.5 bis 9.8 bestehenden Strängen 16, 17 je einer Strang-­Schnittregistereinrichtung 18; 21, 26, 23; 22, 27, 24 zugeführt werden, daß der Weg des Stranges 16, 17 in dieser Strang-Schnittregistereinrichtung 18; 21, 26, 23; 22, 27, 24 entsprechend der Strang-Schnittregister-­Abweichung des Stranges 16, 17 von einem Soll-Wert verlängert bzw. verkürzt wird, daß anschließend der so beeinflußte Strang 16, 17 einer Strang-­Querschneideeinrichtung 19 zugeführt wird. Die Strang-Schnittregister-Abweichungen von einem Sollwert können indirekt über die Abweichung der Zugspannung der Papierbahn 1 oder der Teilpapierbahnen 9.1 bis 9.8 ermittelt werden oder aber auch, indem die Strang-Schnittregister-Abweichungen von einem Sollwert direkt, z.B. mittels Schnittregistermarken-Lesern 64.1 bis 64.8 erfaßt werden.
• 2. Verfahren zum Vermindern von Makulatur infolge von unzulässig großen Schnittregisterabweichungen in einer Rollenrotationsdruckmaschine, bei dem die Wegstrecke eines Stranges 16, 17 auf seinem Weg in eine Strang-­Querschneideeinrichtung 19 in Abhängigkeit von der Schnittregister-Abweichung verlängert bzw. verkürzt wird.
• 3. Aus einer Einrichtung zur Durchführung des Verfahrens nach den Ansprüchen 1 und 4, die gekennzeichnet ist dadurch, daß zwischen dem Ort 10.1; 10.2, von dem an ein Strang 16, 17 auf mehreren Teilpapierbahnen 9.1 bis 9.8 fertig gebildet wird, und einer Strang-­Querschneideinrichtung 19 eine Vorrichtung zum Verändern der Länge der Wegstrecke 18; 21, 26, 23; 22, 27, 24 angeordnet ist, daß die Strang-­Querschneideinrichtung 19 mit dem Strang 16, 17 in Wirkverbindung steht.

In summary, the invention is as follows:

• 1. A method for reducing waste due to impermissibly large cut register deviations in a web-fed rotary printing press, which is characterized in that one or more of several partial paper webs 9.1 to 9.4; 9.5 to 9.8 existing strands 16, 17 each of a strand cut register device 18; 21, 26, 23; 22, 27, 24 are supplied that the path of the strand 16, 17 in this strand section register device 18; 21, 26, 23; 22, 27, 24 is lengthened or shortened in accordance with the strand cut register deviation of strand 16, 17 from a target value, so that strand 16, 17 influenced in this way is fed to a strand cross-cutting device 19. The strand cut register deviations from a setpoint can be determined indirectly via the deviation of the tension of the paper web 1 or the partial paper webs 9.1 to 9.8 or else by the strand cut register deviations from a setpoint directly, for example by means of cut register mark readers 64.1 to 64.8 are recorded.
• 2. Method for reducing waste due to impermissibly large cutting register deviations in a web-fed rotary printing press, in which the path of a strand 16, 17 on its way into a strand cross-cutting device 19 is lengthened or shortened as a function of the cutting register deviation.
• 3. From a device for performing the method according to claims 1 and 4, which is characterized in that between the location 10.1; 10.2, of which a strand 16, 17 is finally formed on several partial paper webs 9.1 to 9.8, and a strand cross-cutting device 19, a device for changing the length of the path 18; 21, 26, 23; 22, 27, 24 is arranged that the strand cross-cutting device 19 is in operative connection with the strand 16, 17.

The device for changing the length of the path consists of at least two rollers 21, 23 fixed to the frame; 22, 24 and at least one between the rollers 21, 23; 22, 24 displaceable roller 26; 27 and a slidable roller 26, 27 is provided per strand 16, 17. In addition, corresponding to the plurality of strands 16, 17, a plurality of rollers 26, 27 which can be displaced together are provided.

Furthermore, to detect the cutting register deviation with the strand 16, 17, cutting register reading heads 59, 60 cooperate, which operate with the cutting register Control and actuating device 62 are connected. A pulse generator 63, which is connected to a knife cylinder of the strand cross-cutting device 19, also acts with the control and actuating device 62.

Parts list

• 1 paper web
• 2 main cutting register device
• 3 paper guide roller
• 4 paper guide roller
• 5 -
• 6 register roller
• 7 pull roller
• 8 slitter
• 9.1 to 9.8 partial paper webs
• 10.1 to 10.2 location
• 11 towing device, second
• 12.1 to 12.8 turning bars
• 13.1 to 13.8 partial web cut register devices
• 14 folder superstructure
• 15 deflection roller
• 16 strands
• 17 strands
• 18 strand cut register device
• 19 strand cross cutting device
• 20 guide roller pair
• 21 strand deflection roller, upper, right
• 22 strand deflection roller, upper, left
• 23 strand deflection roller, lower, right
• 24 strand deflection roller, lower, left
• 25 -
• 26 strand register roller, right
• 27 strand register roller, left
• 28 side frame, front
• 29 side frame, rear
• 30-
• 31 bearing block
• 32 bearing block
• 33 bearing block
• 34 bearing block
• 35 -
• 36 lead screw, first
• 37 lead screw, second
• 38 bevel gear
• 39 bevel gear
• 40 -
• 41 support
• 42 support
• 43 flange (38)
• 44 flange (39)
• 45 -
• 46 support frame, front
• 47 support frame, rear
• 48 synchronous shaft
• 49 bevel gear
• 50 -
• 51 bevel gear
• 52 front end (48)
• 53 electric motor
• 54 pair of pull rollers
• 55 -
• 56 pair of pull rollers
• 57 pair of pull rollers
• 58 folder
• 59 crop mark reading head
• 60 crop mark read heads
• 61 -
• 62 Strand section register control and actuating device
• 63 pulse generator
• 64.1 to 64.8 crop mark read heads
• 65 partial web control and actuating device
• 66 pulse generator

Claims (9)

1. A method for reducing waste due to impermissibly large cut register deviations in a web-fed rotary printing press, characterized in that one or more strands (16, 17) consisting of several partial paper webs (9.1 to 9.4; 9.5 to 9.8) each have a strand cut register device (18; 21, 26, 23; 22, 27, 24) are fed that the path of the strand (16, 17) in this strand cut register device (18; 21, 26, 23; 22, 27, 24) corresponding to the strand cut register -Deviation of the strand (16, 17) from a target value is lengthened or shortened so that the strand (16, 17) so influenced is then fed to a strand cross-cutting device (19). 2. The method according to claim 1, characterized in that the strand-cut register deviations from a target value indirectly via the deviation of the tension of the paper web (1) or the partial paper webs (9.1 to 9.8) are determined. 3. The method according to claim 1, characterized in that the strand cut register deviations from a setpoint directly, e.g. by means of cut register mark readers (64.1 to 64.8). 4. A method for reducing waste due to impermissibly large cut register deviations in a web-fed rotary printing press, characterized in that the distance of a strand (16, 17) on its way into a strand cross-cutting device (19) in Depending on the cutting register deviation is extended or shortened. 5. Device for performing the method according to claims 1 and 4, characterized in that between a place (10.1; 10.2), from which a strand (16, 17) of several partial paper webs (9.1 to 9.8) is formed, and a strand cross-cutting device (19) a device for changing the length of the path (18; 21, 26; 22, 27, 24) is arranged such that the strand cross-cutting device (19) is in operative connection with the strand (16, 17) . 6. Device according to claim 5, characterized in that the means for changing the length of the distance from at least two fixed rollers (21, 23; 22, 24) and at least one between the fixed rollers (21, 23; 22, 24) displaceable Roller (26; 27) consists. 7. Device according to claims 5 to 6, characterized in that a slidable roller (26, 27) is provided per strand (16, 17). 8. Device according to claims 5 to 7, characterized in that according to the plurality of strands (16, 17) a plurality of rollers (26, 27) which can be displaced together are provided. 9. Device according to claims 5 to 8, characterized in that for detecting the cutting register deviation with the strand (16, 17) cooperating cutting register read heads (59, 60) are arranged that the cutting register read heads (59, 60) and a pulse generator (63), which is connected to a knife cylinder of the strand cross-cutting device (19), are arranged in cooperation with a cutting register control and actuating device (62).

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