MXPA96004736A - Device and procedure to gather and improve several pairs of pa - Google Patents

Abstract

A device for collecting and improving at least two strips of paper or film comprises unrolling units, in which a strip of paper with marks applied at periodic intervals is removed by roll removal cylinders, which is eventually driven through direction change cylinders and that meets with at least the second paper strip and is fed to a treatment section. In the treatment section, the at least two strips of paper pass through treatment units, possibly independent of each other, and are fed to a further processing unit. Elements are provided for the congruent adjustment of the longitudinal record of the at least two paper strips, elements comprising components for the formation of a substantially uniform tension in the paper for each of the at least two strips of paper, over the corresponding width of the paper strip, as well as a control unit for driving a transmission corresponding to a braking device. As components for the formation of the tension of the paper, traction cylinders are provided, especially in the form of rubber cylinders, which are mounted after the treatment section and preferably immediately in front of the transformer unit.

Description

DEVICE AND PROCEDURE FOR MEETING AND IMPROVING VARIOUS PAPER STRIPS. The invention relates to a device for gathering and improving several paper strips or tracks according to the main concept of the first claim, as well as to a method for collecting and improving several paper strips. For the improvement of a strip of paper, is understood in the broadest sense of the word any form of transformation, either printing, coating, numbering, perforation, stamping or also the application or coating (bonding) with plastic cards, such as credit cards, with small containers containing samples, labels or also the realization of windows for addresses and their coating with transparent films. When a single strip of paper is improved, without end, due to a synchronization of the developments, the impeccable subsequent transformation of the same, such as folding or cross-cutting, depends exclusively on the correct observance of the speed of the strip or track. This occurs, for example, because coincidence perforations are made in the paper strips, that is to say in registration, in which strips with barbs are placed that are arranged along the transformation or improvement section to guarantee in this way a synchronized advance of the paper strip. However, this longitudinal form of registration has the drawback that on the one hand, inside the subsequent transformation unit, this perforated edge must be removed in general terms, and on the other hand, this perforated edge which is on both sides is translated. edges, means a loss of material, which as such is of high value. In a known device, this drawback is solved by a system in which the paper strip is ic, provides certain markings that are registered through a strip scanner. This scanner is mounted in front of the subsequent transformation unit. With this, that is to say, by means of an adequate control, a further adjusted transformation is possible, such as the works of printing, embossing, stamping or cutting of strips already worked, for example, preprinted. Through control, • '- the drive of the feed rollers located in the cylinders unit is regulated here, so that the length of the formats can be influenced. As Alternatively, the register can also be corrected, if necessary, by means of a synchronized motor that influences the actuation of the feed cylinders arranged in front of the transformation unit. However, the situation fundamentally changes when not only must a strip be improved and subsequently transformed, which is a requirement that occurs, for example, in the oppression of newspapers, but when several strips must be processed or transformed, possibly in a different way, and think here, for example, in a packet that contains some sample, which is applied by sticking, or, removable answer cards. For such modality to date, no satisfactory solution has been found. Undoubtedly, it is possible to drive all the paper strips on barbed webs, but this would not allow an independent transformation of the individual strips. It is true that the other device, illustrated above, is useful for a strip of paper, but not for several strips that are driven together, that is, one over another, and that are independently transformed and that can constitute strips of different quality or that they undergo a different improvement (for example, a different coating). The task of the present invention is, therefore, the creation of a device and a procedure with the help of which various strips of paper can be combined and, if necessary independently of each other, can be combined together and can be fed together further processing unit, with all precision regarding the "record" or longitudinal coincidence. One possibility for the solution of this task is presented in the form of an embodiment of the combination of features contained in claims 1 and 7. Certain advantageous variants are described in the dependent claims. By "paper strips or tracks", in the sense of the present invention, the totality of the materials that are present in the form of strips or strips must be understood and that, in their case, they undergo some process of improvement and that then they must be joined with other strips, to be submitted later, that is, in combination with the other strips, to a subsequent treatment. Thus, for example, strips of thin sheets or particles, which are rather thin cardboard strips as well as paper strips of different thickness and quality, are included with this term. By the term "meeting" of the different paper strips, the interrelated arrangement of the already unrolled paper strips must be understood, possibly with a certain distance between them, before the strips pass through the transformation treatment section where they are transformed in an independent way among them, or they do not undergo any treatment, that is, they can also travel other paths. Thus, according to the present invention, there is the possibility that one of the untreated strips passes through the transformation section while another strip is driven on direction change rollers to undergo improvement processes. But, in the same way, it is also possible to transform all the strips "simultaneously into a single processing unit, for example, to be entangled or numbered." The elements for a congruent adjustment of the longitudinal recording system 5 of the means comprising less two strips of paper, in order to structure a paper tension basically equal for at least two strips of paper, over the width of each strip, so that only the registration of the marks applied on the paper strips through the strips "strip scanners" becomes important in terms of their chronological sequence, being able to take advantage of this register to regulate the longitudinal record of the at least two paper strips, only because the collected paper strips are under a certain tension of the paper , is It is possible to compensate again the differences in the longitudinal register, which may occur, for example, as a result of the • "improvement that occurs in the transformation section, and which are determined or localized by the strip scanners through the registration of the marks." For this purpose, a device is operated through a control unit, in each case a device of braking actuation, which in particular is assigned to each withdrawal cylinder since these cylinders are the cause of the speed of the strip, since they are driven rollers.

To guarantee, over the transformation section, also through the different processing units, a treatment with precise registration of the different strips and their subsequent joint and correct transformation in the subsequent transformation unit, the auxiliaries must be assembled to structure the tension of the paper, at least between the processing section and the subsequent transformation unit, and in view of the fact that the strips within the further processing unit, in general terms, are no longer under tension, will be placed within the possible immediately ahead of the subsequent processing unit. The elements are assembled to create the tension in the paper as a pair of rollers of traction in the form of rollers or cylinders of rubber, then because of its relatively elastic surface the pressure working on the strips of paper gathered from one can be distributed. more evenly across the width of the paper strip, ie, in a more uniform manner as would have been possible, for example, in known pull rolls, which is just a fundamental requirement for the improved strips. When such rubber rollers are provided with a certain profile in their circumference, then the improvement products applied on the strip or the paper strips will be absorbed when these strips pass through the rubber rollers within the adjusted notches of the profile, and therefore, the pressure exerted on the gathered paper strips continues to be equal. Depending on the quality of the paper used, the number of paper strips, and possibly the treatment class of the different strips made in the treatment section, instead of a single pair of traction rollers, it is possible to assemble several pairs in order to guarantee a closure in terms of energy or force, sufficient between the different paper strips and / or to eliminate any air bubbles, possibly present between the paper strips, by means of squeezing systems. When a strip scanner, which records the extreme upper strip marks, is mounted in the region of the traction rollers, and in the case of several pairs of traction rollers especially in the region of the last pair of traction rollers As seen in the paper transport direction, the guarantee is thus created that the next further processing takes place with an exact longitudinal register, especially when the subsequent processing unit follows the traction rollers as far as possible. The registration of the marks present on the paper strips conducted below the upper end strip takes place here through strip scanners, which are mounted in front of the treatment section and thus also with all correctness and shape. simultaneously the longitudinal record required for the individual treatment, that is, these particular scanners are assembled, immediately before the meeting with the upper paper strip, in each case. Also for the extreme top strip, a strip scanner located in front of the treatment section can be mounted, whereby, particularly in the case of different treatment units, within the treatment section, an information for the correct longitudinal registration of the track is produced exclusively extreme top, in addition to those informative registration values available through the strip scanners located in the area of the traction rollers, which are then particularly exploited and only for the correct registration of the sections belonging to the further processing unit and the sections of the treatment unit. The invention will be described by way of example, in what follows, with the aid of drawings. Figure 1 represents a unwinding unit; Figure 2 is a side view on the device according to the invention, which serves to gather and improve three strips of paper, with three unrolling units and Figure 3 is a front view on the device, from above, according to which is represented in Figure 2.

In Figure 1 there is shown a winding unit 1, in which a strip of paper 3 is unrolled from a roll 2. For this purpose, the axis 4 of the roll 2 is supported, in a guide oblique roll 5, and the paper strip 3 is unrolled through a roller 6, which rests against the circumference of the roll 2, and this roller 6, in general terms, will be of the driven type, and also useful as a brake. Then there are two detachment rollers 7 and 8, with their differential mechanisms that remove the paper strip 3 with a certain speed, which can be chosen or regulated. This determines the speed of the paper strip. The registration of the strip is determined by a read head 26 and this value is fed to a control unit 19 as a reference value. Next, the paper strip passes through a control system for the edges or edges of the strip 9, which allows the further processing of the paper strip 3, with an exact lateral registration. As can be seen in Figures 2 and 3, through several such unwinding units la, Ib and lc, which are juxtaposed, the paper strips or also strips of thin sheets, or films 3a, 3b, are unrolled. and 3c. The different strips pass by diversion cruisers 10a, 10b and 10c, where they pass on direction change rollers 13a, 13b, and 13c, and each subsequent strip will in each case be placed below the strip or the previous strips . Then, they are fed to a treatment section 11. In the treatment section 11, then the three unrolled strips 3a, 3b and 3c are treated, either jointly or also independently between them, in accordance with the treatment steps desired. Thus, for example numerator mechanisms, printing aids (such as ink-jet or laser-type printers), multiflex sections, binding stations for punching or rotating applicators for placing small containers or packets can be mounted. For each of these intermediate modules, which can be freely placed, the cabinets with drive mechanisms or transmissions 12 are provided, which in each case have a 360 ° register. The paper strips do not need to be driven in the treatment section 11, as already known from the state of the art through spiked bands, but here they are in a state of free tensioning, and eventually, they are driven to through change of direction rollers, according to the intermediate module that will be mounted on this site. On the other hand, and especially in view of the fact that an independent treatment within the treatment unit of the different paper strips is possible, an individual guide can also be mounted, at least for one of the paper strips, of the bands f on barbs. For example, a strip that is moistened in the treatment section can be expanded or expanded by this measurement. To compensate for this effect, the strip is guided through intermediate rollers or around additional cylinders in order to maintain the required tension. After passing through the treatment section 11, the strips 3a, 3b and 3c are guided between two driven rubber cylinders 14a and 14b and fed to a further processing unit 15. In the known treatment and transformation units Subsequently, the traction groups are assembled, which are formed, in general terms, as mechanical press rollers, after the unwinding unit. After the treatment section, and before the subsequent processing unit, no further tension groups are mounted. The guide rollers located in front of the further processing unit and optionally adjustable, serve, as already indicated in the introduction, within the known installations, to correct the registration, that is, the perfect coincidence, of the strips, but they do not serve to structure a certain strip tension. On the other hand, through the rubber cylinders, 14a and 14b, it is possible to structure, in front of the further processing unit 15 and above all, the width of the paper strip, a tension of paper that will be the same in each case, with a verification system of the same. Rubber wraps of different profiles, can be applied here on the cylinders and are therefore adaptable to the different treatment operations. Thus, it is possible to practice, for example, recesses in these rubber cylinders, within which the card distributors provided in the treatment section are fitted, on plastic cards that are stuck on one of the strips, or, containers with samples that are applied with a rotary applicator. With this, the pressure on the width of the strips will remain uniform on this site, considering all the strips assembled. These rubber cylinders 14a and 14b are driven, ie in a basically synchronized manner with the revolving of the printed figures. That is to say, the paper strips are pulled and kept in a tensioned condition over the entire treatment section 11. The basic adjustment will be achieved in this case, with the help of the verification of the overlapping paper strips, by the operating personnel , and the subsequent subsequent corrections that occur during the treatment operation will be carried out by means of the regulatory devices that will be described later.

It is also possible to mount additional pairs of traction knuckles, which also, and preferably, will be configured as rubber cylinders. Such an arrangement is advantageous when it comes to products consisting of several layers, since during the meeting of several strips, often created or remain cojincitos or air bubbles between different strips, in particular the inner strips that they could cause inconvenient modulations in the different registers. For this purpose, at least two pairs of traction rollers must be mounted one after the other. The variations created by the air bubbles can be compensated with these rollers. But additionally, the pairs of traction rollers can also be mounted within the treatment section, between certain sections or treatment units, which can be particularly advantageous in the case of prolonged stretches of treatment in order to maintain in a safe condition the tension throughout the treatment section. In general terms, it is used as traction rollers, rollers that have a standardized circumference of 24 inches, that is 60.96 cm. Both cylindrical rollers 14a, 14b of the pair of traction rollers are of the driven type, that is to say synchronously, so that the same circumferential speed is guaranteed. The axes of the two cylinders 14a and 14b are tuned between "" M.s, with full precision and are placed perpendicularly on the paper conveyor direction. With this, the compression exerted by the couple of the traction rollers on the interleaved paper strips will be equal, and these strips will be transported in a straight line and without the smallest "binding" angle. It is evident, for example, depending on the material or resciliencia sheath drive rollers, has to adapt the circumferential speed of these rollers drive the corresponding thickness of the strip or strips conducted including paper. Due to the information available about the registration of the marks, the circumferential speed of the roller or of the traction rollers can also be modified. For this purpose, a servo-type regulator 22d is operated through the control unit 19 to operate a servo motor 22d in the transmission 21d of the traction rollers preferably configured as rubber cylinders 14a and 14b. This ensures that the paper strips can be treated with perfect registration within the subsequent processing unit 15, which follows. But also the correct positioning of the sections of the treatment unit 11 is similarly adjustable. Correspondingly (not shown), the transmissions of the intermediate modules 12 can be controlled via the control unit 19. A main drive 23 has been provided for the actuation of the withdrawal rollers 7 and 8, for the actuation of the intermediate modules 12, for the rubber cylinders 14a and 14b and for the different stations corresponding to the subsequent transformation unit 15. The subsequent transformation unit 15 can be, for example, a cutting, drilling or of binding. The distance between the rubber cylinders 14a and 14b and the further processing unit 15 as far as possible, and speaking in general terms, must be minimal since, as seen in the transport direction of the strips, behind the cylinders of rubber 14a and 14b the tension in the paper can no longer be maintained. The treated products, already finished, are then deposited on a storage table 16 or possibly the material is fed to another subsequent transformation system, such as a binding machine or a folding machine. Behind the diversion cruisers 10b and 10c, as seen in the transport direction of the strips, is provided for the second and for the third strip of paper, in each case, a strip scanner 17b and 17c, respectively, and another strip scanner 18 is mounted immediately in front of the rubber cylinders 14a and 14b. This arrangement of the strip scanner 18, immediately in front of the cylinders 14a, 14b, or in its case, in front of the last of the pairs of traction rollers, will generally be advantageous, since the paper strips, inside of the next subsequent transformation unit, they are no longer under tension, as the case may be, as a result of the treatment carried out therein, and they could also be inclined to wrinkling to affect the correct reading of the registration marks. The paper strips 3a, 3b and 3c have marks that have been made at certain determined distances. According to the class of the strip scanners, the marking class will be chosen, such as striped marks that can be perceived through sensors or photoelectric scanners. When the first mark present on the first paper strip, upper end 3a, is now registered, through the strip scanner 18, through this scanner 18 a signal will be created that is fed to a control unit 19.

When the management staff establishes that this longitudinal record is correct, then the availability of a reference value that reproduces the desired speed of the strip and that allows the regulation of the longitudinal record of the extreme upper strip or track is created. to the further processing unit 15, or respectively in relation to the different modules corresponding to the processing unit 11 (therefore, * -s determining the chronological sequence of the signals available through the strip scanner 18). In view of the fact that the tension of the paper strip 3a is generated through the two rubber cylinders 14a and 14b, they must always run with a circumferential speed somewhat greater than what is needed for the strip velocity properly desired. To guarantee now the required longitudinal registration, the signals available through the strip scanner 18, within the control unit 19, are continuously compared with the reference value. When the actual value is diverted, the control unit 19 drives, possibly without contact, a servo type regulator 22a, to drive a servo motor 20a in differential transmissions 21a of the withdrawal rollers 7a and 8a, present in the unwinding unit la. With this, it is possible to hold the paper strip 3a a bit, in other words, in a certain sense to stop it.

Therefore, through the two rubber cylinders 14a, and 14b, it is alternately structured forming the tension of the paper, also subjecting it to verification. Also the other paper strips 3b and 3c must be accurately longitudinally recorded, that is to say, in conjunction with the first strip 3a, since these three strips are transformed independently of their possibly different treatment, together within a unit of Subsequent transformation 15. Now, when the second paper strip 3b, after passing through the diversion cruise 10b, passes through the strip scanner 17b, this scanner will register the marks and in each case send signals to the control unit 19 An exact longitudinal record of the paper strip 3b, ie on the upper paper strip 3a, will be created when the marks of the two paper strips or strips are congruent in the strip scanner site 18. However, on the one hand, the section traversed by the second paper strip 3b between the strip scanner 17b and the strip scanner 18 is known, and on the other hand, following the pressure exerted on the two paper strips 3a and 3b by the two rubber cylinders 14a and 14b there is already a certain tensile force exerted on the two strips. Therefore, from the chronological sequence of the signals received through the strip scanner 17b it can be determined if the paper strip 3b is correctly registered. In accordance with the regulation described for the paper strip 3a, that regulation intended for the paper strip 3b is also carried out. Through the control unit 19, a servo regulator 22b is driven to drive a servo motor 20b in the differential transmission 21b of the withdrawal rollers 7b and 8b, of the unwinding unit Ib.

Also for the third paper strip 3c, from the same Lanera the exact longitudinal register is regulated. For this purpose, the strip scanner 17 is mounted, or through whose signal a servo regulator 22c is driven, in order to operate a servo motor 20c, in the differential transmission 21c of the withdrawal rollers 7c and 8c, corresponding to the unwinding unit lc. After passing through the rubber cylinders 14a and 14b, the assembled paper strips 3a, 3b and 3c continue to be transformed. In general terms, the strips are no longer kept in tensioned condition. Therefore, in order to preserve the congruence of the strips, the further processing unit should be as far as possible immediately after the rubber cylinders 14a and 14b. Optionally, a strip scanner 17a can be mounted, which is assigned to the upper top paper strip. Through this explorer, as already described above, an additional or alternative registration check or control is possible for the upper top paper strip 3a. Within the treatment section 11, additional elements may be mounted, in a known manner, in order to monitor the different registers. After the deflecting cruisers 10a, 10b and 10c, guide rollers 27a (which in FIGS. 2 and 3 are indicated in the form of dashes) may be mounted, which eventually also may be of the driven type but which basically do not work within The paper guide, to fix or tighten it In this case, for each of the strips should be mounted a specific traction group, possibly in its traditional configuration, in order to achieve the correct registration.

Claims (9)

1. CLAIMS 1. The device for gathering and improving at least two strips of paper or films, which carry at least two unrolling units, in which a strip of paper, marked with a mark applied at periodic distances, is removed in each case, by means of removal rollers from a roll, and is conducted, if appropriate, through change-of-direction cylinders, to meet the at least second paper strip and is fed to a treatment section, in which preferably the minus two paper strips - they pass through the processing units, possibly independently of each other, and are fed to a further processing unit, characterized in that elements are mounted for the congruent adjustment of the longitudinal register of the at least two strips of paper , which comprise the following parts: elements for structuring a tension within the paper that is basically the same for each of the at least two strips of paper over the entire width of the paper strip; - strip scanners for recording the chronological sequence of the marks of each paper strip and a control unit for the drive in each case of a transmission or of a braking device allocated in particular to the different withdrawal cylinders.
2. 2. The device according to claim 1, characterized in that, as elements for forming the tension of the paper, at least one pair of traction cylinders, especially in the form of rubber cylinders, are mounted. 5 are mounted after the treatment section and preferably immediately ahead of the subsequent processing unit. The device according to claim 2, characterized in that the rubber cylinders (14a, 14b) carry i < > in its circumference a profile that serves to receive the corresponding improvement products. The device according to claim 2 or 3, characterized in that the axes of the rubber cylinders are tuned to each other, and these axes are assembled 15 perpendicularly, in a plane, with respect to the transport direction of the paper strips. The device according to any of the preceding claims, characterized in that a strip scanner is provided in the region of the cylinders 20, and especially, as seen in the direction of transport of the strips, immediately in front of them, while in each case, a second strip scanner is mounted for each strip of paper other than the top extreme ahead of the stretch of 25, and in particular is mounted immediately in front of the meeting point with at least the second strip of paper. The device according to any of claims 2 to 5, characterized in that the circumferential speed of the traction cylinders can be regulated through the control unit. The device according to any of the preceding claims, characterized in that the subsequent transformation unit immediately follows the traction cylinders. 8. The method for gathering and improving at least two paper strips, in which each of the paper strips bears marks applied at periodic intervals, because in each case within a unwinding unit, the strip is removed by means of cylinders of unwinding in each case of a corresponding roll, to be eventually driven through change-of-direction cylinders, after which, the at least two strips of paper are gathered and pass through a treatment section, in which they are subjected to units possibly independent treatment between them, and are fed to a further processing unit, characterized in that especially the width of the strip of each of the at least 2 strips, a tension is formed in the paper basically uniform and because it is registered the chronological sequence of the marks on each paper strip, record that in the form of signals is fed to a control unit, '.? hi is compared to a reference value p re-established and serves to drive a transmission or a braking device, which is allocated in particular to the corresponding removal rollers. The method according to claim 8, characterized in that the paper strips are kept under tension in each case, at least until the end of the treatment section.