WO1996033121A1

WO1996033121A1 - Process and device for producing printed matter

Info

Publication number: WO1996033121A1
Application number: PCT/CH1996/000135
Authority: WO
Inventors: Roland Kost
Original assignee: Jos. Hunkeler Ag Papierverarbeitungsmaschinen
Priority date: 1995-04-21
Filing date: 1996-04-15
Publication date: 1996-10-24
Also published as: DE19514728A1

Abstract

In the production of printed matter, e.g. publicity material and the like, processing steps like stamping, perforating, adhesive application, transverse cutting and the like are performed at individual stations (12, 18) on a continuous-feed flexible material web (2) along a processing section (7). The material web (2) is conveyed at a substantially constant speed from an intake unit fitted in front of the processing section (7) in the direction of transport to the processing section (7) and taken through the processing section (7) at a substantially constant travelling speed. At least some of the processing stations (12) are fitted with pairs of traction rollers (13). The tractive force exerted thereby on the material web (2) can be adjusted for the processing station (12) concerned - independently of the others - depending on the processing step to be performed at the processing station concerned.

Description

O 96/33121 PC17CH96 / 00135

Method and device for producing printed matter

The invention relates to a method and a device for producing printed matter according to the preamble of patent claim 1 and patent claim 4.

Such a method and such a device are known, for example, from EP-A-0 562 443. There, a method and a device for producing printed matter, such as e.g. Advertising materials, described, in which a flexible material web is continuously unwound from a rotatably mounted roll and fed to individual stations of a processing line, on which e.g. Punchings, perforations and glue applications can be carried out. With sensor and control devices known per se and not further shown in this document, periodic markings are determined on the material web and the speeds of conveying means along the processing line are controlled accordingly.

In this method, the material web is pulled through the processing section under a tensile stress exerted on it by the conveying means. The tensile stresses increase from station to station, so that the material web is exposed to an increasingly higher tensile load. This can be disadvantageous for carrying out certain processing steps, for example when punching out window openings and then sticking a window film over the punched-out area. Due to the constantly increasing tensile stress, the material web in the punched-out area is warped irregularly, so that the window film that is stuck on during the subsequent relaxation can warp, resulting in an unusable end product.

The present invention is based on the object of creating a method and a device of the type mentioned at the outset, in which or in which the individual processing steps on the material web can be carried out under optimal conditions in order to produce high-quality end products.

This object is achieved by a method with the features of claim 1 and by a device with the features of claim 4.

The invention is based on the knowledge that the flexible material web should, if possible, be passed through the individual processing stations with a tensile stress corresponding to the respective processing step. For this purpose, for certain or all processing stations - regardless of the other processing stations - the tensile force exerted by the train arrangements on the material web is set as a function of the processing step to be carried out at the individual processing stations. In this way, the tensile force on the individual processing stations can be increased or decreased between certain limits in accordance with the needs and the changes in the material web caused by the processing, without changing the actual conveyance of the material web through the processing line.

The material web is preferably covered by a feed unit arranged at the beginning of the processing section conveyed essentially constant delivery speed into the processing line, whereby a corresponding short-term acceleration or deceleration of the material web in the feed unit ensures that the periodic markings on the material web run past a reference point in exact chronological agreement with the overall cycle in order to process the processing steps at the right place to be able to carry out the material web. This means that an individual position adjustment of the material web at each individual processing station is basically superfluous. However, it may still be necessary to advance or postpone the starting point of the work cycle, ie the beginning of the processing step, at all or individual processing stations in order to process the material web precisely at the desired location.

Further advantages of the invention result from the following description. In this, the invention is explained in more detail using an exemplary embodiment shown in the schematic drawings. It shows:

1 shows a first part of a device according to the invention for producing printed matter and a schematic representation of the various processing steps,

2 shows a second part of the device adjoining the first part, as in FIG. 1, 3 shows the drive unit for the various work stations and for the associated pairs of pull rollers, and below that shows the possible web tensions between two successive pairs of pull rollers,

4 shows the arrangement of the scanning device on the feed unit, and

5 shows the arrangement of the scanning device on a processing station.

In the figures, the same reference numerals have been used for the same elements and explanations apply to all figures for the first time, unless expressly stated otherwise.

The device 1 shown in FIGS. 1 and 2 for producing printed matter, in particular form and advertising printed matter with a window film, is run through from right to left and is also described in this order. A flexible material web 2, for example a printed paper web, with the processing steps carried out in the various workstations is shown below the device 1. An unwinding station 3 with a rotatably mounted roll 4 from the flexible material web 2 is provided as a store for the flexible material or paper to be processed. This is followed by a so-called loop memory 5. The material web 2 is then conveyed by a feed unit 6 into a processing line, generally indicated by the reference numeral 7, with an essentially constant delivery speed V. The loop memory 5 serves to compensate for differences in the unwinding speed of the roll 4 and the delivery speed V of the flexible material web 2. If the loops that form become too long, a sensor (not shown here) responds in a manner known per se, which causes a delay in the unwinding speed. The feed unit 6 has a pair of compensating rollers 8 and various feed rollers 9 forming a double loop with the material web 2, which are followed by a reading or scanning device 10 provided between two tensioning rollers, which reads periodic markings 11 on the flexible material web 2 scans. The periodic markings 11 can be small lines or also certain images such as bar codes or the like, as are usually found on printed matter and printed matter.

A punching module 12 is provided directly adjacent to the feed unit 6 and has at the beginning a pair of pull rollers 13 with a reading or scanning device 14. Furthermore, a punching roll 15 equipped with punching knives and a counter-pressure roll 16 are provided, with which a window opening 17 is punched out of the paper web 2.

The flexible material web 2 is then conveyed further to an adhesive module 18, which at the beginning again has a reading or scanning device 19 and further consists of a plate cylinder 21, an impression cylinder 22 and a metering unit 23. The plate cylinder 21 has frames 24 made of a rubber-elastic material distributed over its surface at regular intervals over its surface. The adhesive, in particular glue, is applied to the frame 24 by means of the metering unit 23 and correctly in the plate cylinder 21 Working cycle printed around the window openings 17 in the paper web 2. The excess adhesive is collected by a container 26 via a channel 25 and then returned to the metering unit 23. A pair of pull rollers is not provided in the adhesive module 18 for reasons mentioned later.

The paper web 2 is then conveyed further to an application module 28, which at the beginning in turn has a reading or scanning device 29 and also consists of an overlying blade cylinder 30, a middle suction cylinder 31 and an impression cylinder 32 below. A transparent film 33 is guided over various deflection rollers 34 to the suction cylinder 31, which is provided with sieve holes (not shown here) and is connected to a vacuum unit. Due to the negative pressure, the film 33 adheres to the cylinder surface and is cut to the correct size by the blade cylinder 30. This cut window film 35 is then printed in the correct place on the window opening 17 of the paper web 2 surrounded by adhesive. Initially, the application module 28 has a pair of pull rollers 36 which pulls the paper web 2 out of the cylinders 31 and 32 with a predetermined pull.

The paper web 2 is then conveyed to a perforating module 37, which initially has a pair of pull rollers 38 and further consists of a perforating cylinder 40 covered with perforating blades and a smooth, hardened impression cylinder 41. As a result, the paper web 2 is provided with a perforation 42 in the transverse direction. Deflection rollers 43 are also provided at the output of the perforation module 37. The paper web 2 is then transported further via dancer rollers 45 to a cross-cutting module 46 which, after the dancer rollers 45, has a reading or scanning device 47, a pair of pull rollers 48 and a blade cylinder 49 with a correspondingly designed counter-pressure cylinder 50. The finished printed product 51 is then output from a sheet delivery 52.

The drive unit 54 of the entire device 1 shown in FIGS. 1 and 2 is shown purely schematically in FIG. 3, the course of the tensile stress S in the material web 2 along the processing path 7 defined by the various processing stations being indicated in the lower part of this FIG is. All processing stations are driven by a single drive motor 56 via a common drive shaft 55, which is preferably designed as a cardan shaft. By means of a belt 57 a superposition gear 58 is driven, which is connected to the various cylinders 60 of the processing stations 61 via a further belt 59 in rotary drive connection. The superposition gear 58 is itself drive-connected to a stepper motor (not shown) (see FIG. 5) and has a circumferential register of 360 °. The position of the interacting cylinders 60 of a processing station 61 (punching module 12, adhesive module 18, application module 28, perforation module 37 or cross-cutting module 46) can thus be determined by the respective superposition gear 58 in accordance with the scanned periodic markings 11 on the paper web 2 can be set, as will be described in more detail with reference to FIG. 5. The pair of pull rollers 63 (corresponds to the respective pair of pull rollers 13, 36, 38 or 48) of the individual processing stations is driven by the common drive shaft 55 via a belt 62. The lower roller 64 of the pair of pull rollers 63 is connected to the belt 62 in a rotary drive connection via an adjustable coupling 65, in particular an electrically adjustable magnetic powder coupling. By means of the coupling 65, the tensile force on each pair of pull rollers 63 can be set individually in a range from 0 to 250 N. The web tension can thus be set at each selected processing station 61 depending on the requirements for the processed flexible web 2. 3, curves a, b and c of web tension S below the diagram of drive unit 54 are given as examples of a different setting. Curve a represents a slightly increasing web tension between the pairs of pull rolls of successive processing stations 61. Curve b shows a changing web tension S from one pair of pull rolls to another, and curve c a falling web tension S. The respective pair of pull rolls 13, 36, 38 or 48 has the task of requesting the material web 2 through the processing section 7. However, the throughput speed of the material web 2 is not changed by the respective pair of draw rollers 13, 36, 38 or 48. In order to ensure that the processing steps with regard to the periodic markings 11 are carried out in the correct place, the measures explained in detail below with reference to FIGS. 4 and 5 are taken (individually or together). In FIG. 4, the drawing-in unit 6 with the drawing-in rollers 9 and the associated reading or scanning device 10 are shown purely schematically. The feed rollers 9 are driven via the common drive shaft 55 and a superposition gear 67 arranged directly thereon and provided with a stepping motor 66. A comparison unit 68 is provided between the scanning device 10 and the stepping motor 66, to which on the one hand the actual time pulse Z _Is ^ of the scanned periodic marking 11 generated by the scanning device 10 is applied, and on the other hand the one matched to the overall cycle Target time pulse ZG _So ^^. From these time pulse signals Z _Is . and ZGg _Q ^, a correction signal ZG _j - _{orr is} determined in the comparison unit 68 and applied to the stepping motor 66 in order to briefly accelerate or decelerate the material or paper web 2 in accordance with a determined deviation 6ZG between Z _Is ^ and ZGg _Q. Specifically, in the case shown, this means that the material or paper web 2, which is fed into the processing section 7 by the feed unit 6 at an essentially constant delivery speed V, is advanced or set back according to the deviation δZG, so that the actual time pulse ^z _Is ^. then coincides with the target time pulse ^ZG target. As a rule, such a correction needs to be carried out only once in the form of a pre-shift or set-back so that the respective processing steps can then be carried out with respect to the periodic markings 11 at the correct location.

Likewise, in FIG. 5 for a processing station 61 with processing cylinders 60 (corresponds to the punching module 12, adhesive module 18, application module 28, perforating module 37 or cross-cutting module 46) and the associated scanning device 69 (corresponds to the scanning device 14, 29, 39 or 47), a comparison unit 68 is provided, which in this case contains the current actual time pulse Z _Ist with the target time pulse ^ZE coordinated with the work cycle of the processing station 61 should compare and a correction signal

outputs the cylinder 60 of the respective work station 61 for the work cycle. As explained above, this correction signal ZE _Korr is used to start up the stepping motor 66 of the superposition gear 58, as a result of which the deviation δZE between Eg ₀ n and ^z _i st corresponds to a brief shift in the starting point of the work cycle, ie a rotation of the machining cylinder 60. The delivery speed V of the paper web 2 in the area of the respective work station 61 thus remains unchanged and the rotational speed of the cylinders 60 is briefly increased or decreased in accordance with the determined deviation δZE. Such a correction is necessary above all if the web tension has been increased or decreased by the pairs of draw rollers 13, 36, 38 and 48, which leads to local stretching or compression of the paper web 2 - also in the area of a processing station 61 can come without a pair of pull rollers, such as the adhesive module 18, which is why the periodic markings 11 on the paper web 2 shift. Such a slight shift in the periodic markings 11 is thus compensated for by this correction, so that the processing steps at the respective processing station with respect to the periodic markings 11 are subsequently carried out again at the correct location (compare FIGS. 1 and 2). It is therefore understood that this correction is generally carried out only once if the paper web 2 has a constant behavior with regard to the elongation.

The delivery speed V can be set between 10 m / min and 200 m / min depending on the printed product 51 to be produced. In the production of form and advertising printed matter with viewing windows, the constant delivery speed and throughput speed lie between approximately 120 m / min and 150 m / min. In order to prevent later warping of the window foils 35, no pair of pull rollers is provided between the punch module 12 and the adhesive module 18 and between the adhesive module 18 and the application module 28. The punched-out window opening 17 is thus not additionally subjected to tensile stress, so that the window opening 17 maintains its shape in this area. Only when the window film 35 has been applied to the application module 28 does the paper web 2 in the region of the window opening 17 again have sufficient inherent stability through the window film 35 to be subjected to an additional tensile stress by the pair of pull rollers 36.

Claims

claims

1. Methods of making printed matter such as e.g. Form and advertising materials and the like, of a continuously supplied flexible material web (2) of a given width, in which on the material web (2) provided with periodic markings (11) along one, several processing stations (12, 18, 28, 37 , 46) having a processing section (7), processing steps such as punching, perforating, adhesive application, cross cutting and the like. Are carried out, the material web (2) by means of traction arrangements, preferably pairs of traction rollers (13, 36, 38, 48), which on at least part of the Processing stations (12, 18, 28, 37, 46) are provided, is moved through the processing section (7), characterized in that for individual or all processing stations (12, 18, 28, 37, 46), independently of the other processing stations , the pulling force exerted by the pulling arrangements (13, 36, 38, 48) on the material web (2) depending on the pulling force at the individual processing stations (12, 18, 28, 37, 46) Processing step is set.

2. The method according to claim 1, characterized in that the material web (2) from a feed unit arranged in the conveying direction in front of the processing section (7)

(6) with a predetermined, essentially constant delivery speed (V) into the processing line

(7) is conveyed in, and that the periodic markings (11) in the area of the feed unit (6) are scanned by one actual time pulse each (Z _ls .), Which is compared with a target time pulse (ZG _jg ^), and that the material web (2) according to the time deviation (δZG) between the actual and target time pulse before entering the processing line ( 7) is accelerated or decelerated for a short time.

3. The method according to claim 2, characterized in that the periodic markings (11) are further scanned at a number of selected processing stations (12, 18, 28, 37, 46) of the processing section (7), in each case by an actual time pulse ( ^z _Is ^), which is compared with a target time pulse (ZE _Ig ^.) matched to the work cycle of the corresponding processing station, and that at this processing station the starting point of the work cycle corresponds to the time difference (δZE) between the actual and target -Time pulse is brought forward or brought back.

4. Device (1) for producing printed matter, such as advertising materials and the like. From a continuously supplied flexible material web (2) of a given width, with a memory (4) for dispensing the flexible material web, preferably an unwinding station (3) a downstream processing section (7) with several processing stations (12, 18, 28, 37, 46) for processing the material web (2) and with train arrangements (13.) provided on at least some of the processing stations (12, 18, 28, 37, 46) , 36, 38, 48) for moving the material web (2) through the processing section (7), thereby characterized in that for individual or all processing stations (12, 18, 28, 37, 46), regardless of the other processing stations, the pull arrangement (13, 36, 38, 48) assigned to one of these processing stations onto the material web (2) exerted tensile force is adjustable depending on the processing step to be carried out at the corresponding processing station (12, 18, 28, 37, 46).

5. The device according to claim 4, characterized in that at certain or all processing stations (12, 28, 37, 46) a pair of pull rollers (13, 36, 38, 48) is provided, which a predetermined, adjustable tensile force on the material web ( 2) exercises.

6. The device according to claim 5, characterized in that the pair of pull rollers (13, 36, 38, 48) via an associated adjustable clutch (65), in particular a magnetic powder clutch, with which the pulling force is adjustable, is driven.

7. The device according to claim 6, characterized in that the pulling roller pairs (13, 36, 38, 48) are driven by a common drive unit (56) via the associated coupling (65).

8. The device according to claim 4, characterized in that a feed unit (6) with feed elements (9) is arranged in the conveying direction upstream of the processing section (7), which feeds the material web (2) at a predetermined, substantially constant delivery speed (V) convey the processing line (7) in, and the feed unit (6) one Assigned to the scanning device (10), which generates an actual time pulse (Z _Is ^) from the scanned periodic markings (11) on the material web (2), which in a comparison unit (68) with a target time pulse (ZG ₀ n) is compared, and the feed elements (9) briefly accelerate or decelerate the material web (2) in accordance with the time difference (ÖZG) between the actual and target time pulse.

9. The device according to claim 8, characterized in that the feed unit (6) and the

Processing stations (12, 18, 28, 37, 46) are connected to a common drive unit (56) in rotary drive connection and the feed unit (6) has a superposition gear (67) driven by a drive (66), preferably a stepper motor, for accelerating or decelerating the Intake elements (9) are assigned, the drive (66) of the superposition gear (67) being in control connection with the comparison unit (68).

10. The device according to claim 9, characterized in that a number of selected processing stations (12, 18, 28, 37, 46) is assigned a scanning device (14, 19, 29, 47), which consists of the scanned markings (11) on the material web (2) generates an actual time pulse ( _Is ^), which is compared in a comparison unit (68) with a target time pulse (G _C - _Q -L _T X) that is matched to the work cycle of the assigned processing station, and the point of use of the work cycle of the processing station according to the time deviation (δZE) between Actual and target time pulse is brought forward or back.

11. Device according to claims 9 and 10, characterized in that on the selected

Processing stations (12, 18, 28, 37, 46) each have a superposition gear (67) driven by a drive (66), preferably a stepper motor, for briefly accelerating or decelerating the processing means (60) of the associated one

Processing station (12, 18, 28, 37, 46) is arranged, the drive (66) of the superposition gear (67) being in control connection with the comparison unit (68).