ES2204554T3 - DEVICE FOR THE PROCESSING OF FORM TRACKS. - Google Patents

Abstract

The device (1) for processing at least one strip of forms by means of controlled or clocked advancement of said strip (B1) has at least one guide (12) for said strip extending towards a crosswise separating device (11) therefor. The device comprises a mechanism (17; 162) for controlling the advancement of the strip. The mechanism for advancing the strip has a driven roller (182) for each strip, extending perpendicularly to the working direction over the working width of the device and cooperates with at least one pressing device (192), i.e. at least one non-driven idling roller or several of such rollers, in order to advance said strip. The driven roller has a continuous main shaft (20) which is joined on the ends thereof to a drive for rotation of the continuous main shaft. At least one pair of cylindrical bushings (21; 22) which can rotate around said main shaft and interact with each other by means of a differential gear (24) are borne on the main shaft.

Description

Device for processing tracks form.

The invention relates to a device for form track processing by cyclic advance and cutting form clues; these types of devices are know, for example, by the German utility model G 85 04 658 (1985) as well as by publication EP-A-0 156 775. The devices of these types are used, especially for processing automated continuous forms, ie for separation of the track as well as for the meeting of the sections that go together and, as a rule, also to envelope.

The publication EP-A-0 510 324 also refers to the processing of continuous forms. Here the clues are transported with the help of tapes that are in contact with these and are circulating.

The technological background finally belongs to publication EP-A-0 556 640 which describes the so-called Capstan roller for thermal printers. The paper roll to be printed consists of three segments, which are connected to each other by a differential drive, to match the average speed of the two final segments at the speed of the central segment.

On devices of the type described in the part of Preamble the form tracks, which are advanced so continuous or discontinuous, that is cyclic, are separated transversely with respect to the work direction in sections Individuals of predetermined length. The advance takes place in these means by means of the denominated tractors, that is to say, wheels to bolts or ribbons to bolts, whose bolts engage in the usual marginal perforations on one or both side (s) of the form track. The progress control can take place from mechanical or electrical or electronic way and, for example, electro optics, for example by means of a program and / or by means of form and according to the corresponding requirements regarding the form length

In general it was assumed in the specialized world that such an advance could be achieved in the most precise way with wheels or bolt tapes and form tracks correspondingly perforated by the margin. He accepted for it the disadvantage that you have to use paper with perforations marginal and that means are necessary for the separation of lateral marginal perforation strips. In addition, the strips of separate marginal perforations generate a remarkable volume of waste paper, which must be removed and disposed of.

Therefore, it would be desirable to have a device of the type mentioned at the beginning which avoided use of paper tracks with marginal perforations and, without However, it made possible a precise advance of the tracks of form. The invention poses the problem of proposing a device that meets these requirements, so that it can use paper tracks without perforation strips marginal, no waste generated due to marginal strips separate and no means are necessary for lateral cutting of the form tracks or forms formed from they.

Attempts to use transport devices instead of tractors usual with pairs of rollers for the advance of the tracks of form, such as those used for continuous processing of paper, plastic or textile tracks and that have at least one pair of rollers with opposite direction drive for the cyclic advance of the tracks towards a processing station or cut.

The publication US-A-4 555 967 refers to a continuous track driving device, in which for the cross section of the track does not interrupt the progress of the track.

The publication US-A-3 552 903 discloses a track driving device with a compensating gear in a runway winding system operated in a manner keep going.

The investigations that have led to the The present invention has shown in particular that in this way high processing speed of 1-4 m / sec and the precision of advance necessary for suitable devices for processing paper tracks printed, especially not in case of prolonged operation and the then inevitable interaction between the form track and the roller, for example as a result of impurities, paper fluff and the like

Surprisingly, the problem can be solved that the invention is raised above because the track of form is conducted, to achieve sufficient progress precise and in the right direction, on a driven roller the which interacts with at least one imprisonment device by example at least one accompanying roller, which is in contact but is not powered, or other means that act in the same way and that have two parts, which are connected to each other by a compensating gear, in order to compensate for irregularities of the progress such as those that may result, for example because of impurities or other side effects of rapid operation and Continuous device.

To do this, according to a first general and preferred embodiment of the invention, on the through main axis, which extends along the width of work (that is, along the width of the processed track) and which is connected only on one side with a drive for shaft rotation, at least one pair of bushings, which is arranged with possibility of rotation and, with respect to the central line longitudinal of the corresponding form track, essentially symmetrically, the bushings being connected adjacent to the longitudinal center line by means of a gear compensator. The compensating gear has two gear wheels conical of which each is rigidly connected to the torsion with the bushings adjacent to the center lines longitudinal of said at least one pair of bushings; the action connection of these bevel gear wheels takes place through two compensation bevel gear wheels, the which can rotate freely around a common axis, the which are arranged perpendicularly with respect to the axis main, for example in a main shaft drill corresponding that runs transversely.

The compensating gear according to the invention has an action analogous to that of the known differential gear on the driven wheels of a car, which runs a curve, with which the wheel drive speed adapts to the different radii of the curve traveled by each wheel. Only in case of a straight route - here in the case of a march exactly rectilinear in each case of the form track - both bushings are operated with exactly the same speed. The compensating gear used according to the invention between the contiguous bushings on the main shaft results in that, in case of a lateral deviation from the sense of normal straight gait of the form track, the deviation is compensated and corrected automatically by the compensating gear.

According to a first general embodiment, the invention therefore relates to a device for the form track processing by cyclic advance and cut of at least one form track, which presents the characteristics indicated in claim 1 of the patent. The preferred embodiments of the device according to the invention have the characteristics indicated in claims 2 to 7.

The compensating gear is, according to a form of preferred embodiment of the invention, a mechanical gear, of a known type itself, which has two bevel gear wheels of drive and two bevel gear wheels offset; each of the conical gear wheels of rigid way to twist with one of the bushings; both bevel gear wheels are arranged with possibility of turning around a transverse axis, which is connected to the main shaft and, for example, is driven to through these; at the same time each of the wheels of bevel drive gear is crimped with the two bevel gear wheels compensation.

In such a mechanical gear the wheels Conical drive and / or compensation gear are formed, according to a preferred embodiment, as wheels of bevel gear, preferably self lubricating, is say at least one of the bevel gear wheels or wheels of toothed bevel gear meshing each other consists of at least on the outer side of a self-lubricating polymer, such as polyamide, polyacetal, polyester. The optimization of the choice of material for compensating gear wheels, and also for all other parts of the device according to the invention, are is in the field of knowledge of the expert in the subject.

In general, friction surfaces, that is, the surface that comes into contact with the corresponding track of form of the bushes connected in motion by means of the compensation gear, are coated with an elastomer abrasion resistant, especially an elastic material such as rubber, for example natural or synthetic elastomer, such as rubber, polyurethane, polyisoprene or the like, which typically has a Shore A hardness in the range of 80-100 typically 90-95.

In addition, the effect of surface friction of the bushing can also be achieved through the constitution of surface or surface structuring, for example take place by surface roughness and / or profiling in Sample form or statically distributed. For this you can also use surfaces or surface areas made of abrasion resistant materials, including metal, ceramic, glass and hard materials (synthesized metal, metallic carbide, nitride, diamond, boron nitride) coatings, for example in the form of encrustation of sufficiently fine grains of these hard materials in a layer of metallic binder or not metal.

\hbox{materia.}

For the choice of the friction surface there is also a choice of optimizing material, taking into account the above data, in the field of knowledge of the expert in the

 \ hbox {matter.} 

In general they are used for driving the track of form in longitudinal direction at least two points of contact opposite each other to be in contact with the two side edges of the form track. They are preferably separated from each other pairs of contact points, in the direction of device work, that is, the direction of the tracks, at least the working width of the device, and this before of the corresponding driven roller. It is understood that the points of contact or pairs of contact points can be positioned, since either for adaptation to different form widths such as for the fine regulation of the introduction of the form.

For the operation of the new device with Cyclic advance of the form track can be assigned to the form track, in each advance cycle, a phase of acceleration, a movement phase and a braking phase; the phase acceleration is initiated by a signal corresponding to the length of the desired form and the regulation of the progress of the form track takes place at a point determined by the form length

At the same time the form track has, of known form, for example marks generated by printing, whose optical reading initiates the control signal corresponding to the desired form length; the movement It is controlled at the same time by an electronic regulation known per se, which compares the actual value of the point of beginning of the advance with the theoretical value and carries out the drive regulation from the difference.

The invention is now explained on the basis of the accompanying drawings of preferred embodiments, but not limiting In the drawings, the figures show:

Figure 1, a schematic representation of a device according to the invention with a first form track and a second optional track;

Figure 2, a semi-schematic sectional view of the driven roller of a device according to the invention;

Figure 2a, an enlarged representation of the roller compensating gear according to Fig. 2;

Figure 3, the scheme of an advance cycle, Y

Figure 4, the schematic top view on a driving with a form track and the corresponding driven roller.

The device 1 schematically represented in Fig. 1 has a first conduit 12 for the tracks of form B1 and a second optional driving 14 (drawn in strokes) for a second track of form B2. The number of form tracks is limited only by data constructive and the number of the form tracks to be process.

In an analogous way (not represented) they could also gather, if desired, three or more form clues, to the extent that this is possible spatially in the given case. The number of tracks processed simultaneously with the device according to the invention it is not considered critical and it is decision Discretionary of the subject matter expert.

If more than one driving is used, the conduits can be arranged one over the other converging in a known way. At the same time it is not essential, in the case of use of more than one roller (and simultaneous processing of more than one form track), if the conduits include each case an angle with the horizontal or if a conduction runs approximately horizontal In case of using a single form track driving 12 may be arranged horizontal or at an angle to the horizontal. The magnitude of this angle is again in the margin of the discretion of the specialist in the field.

The form track B1 and any other existing form track where applicable is supplied to device, from a source not represented, for example a tank or longitudinal separation device for a track of form printed on both sides. Each form track is in lateral contact with a conduit 13 or 15 (Only the driving in front is represented).

Each form track circulates, between the corresponding 182 or 184 driven roller and the device imprisonment that is in contact with him, with slight pressure typically 50-500 g, for example contact rollers or 192 or 194 escorts or clamping devices that act  similarly, towards the transverse separation means 11 the which, for example, can be formed in a manner known as "guillotine" with a cutter bar or blade and one or two cutting edges, such as rotating blade or similar. How has it indicated briefly, can be used for each roller also several contact rollers and / or replace them or complement them in terms of their action by devices that act as same or similar way, for example contiguous springs, stirrups or Similar.

Roller 182 or 184 is connected to a corresponding drive 162 or 164, for example a electric motor, whose activity is regulated by a control 17 with the in order to drive the at least one form track to the middle of transversal separation 11.

The structure of the driven roller 182 is explained in Fig. 2 on the basis of a sectioned representation semi-schematic The roller has a main shaft 20 through and of a single piece made of a rigid material, typically steel, aluminum or the like, which is driven by both ends 201, 202 with possibility of rotation in bearings 204, 205 and is connected on the side, here for example the end 201, with a motor Drive not shown.

On the main shaft 20 two are driven bushings 21, 22 between two stopper pieces 206, 207 connected with the axis 20 with the possibility of turning around the axis. Each cap It is typically made of a rigid material, such as steel, aluminum or Duroplast material and is endowed with a coating of friction 219, 229, for example made of an elastic polyurethane (for example Vukollan® from Bayer AG) or a coating Made of hard fine grain material in a matrix material suitable.

In each socket is in contact, in the area of its friction lining 219, 229, the corresponding roller of imprisonment 29a, 29b, in order to press the track of form sufficiently against the friction lining, of such that the form track (not drawn in Fig. 2), when actuating the drive (not shown in Fig. 2), be transported practically without sliding.

The two bushings 21, 22 are connected between yes by means of the compensating gear 24 in the area of the center of the main shaft 20, as shown augmented in Fig. 2a. The compensating gear 24 consists of two gear wheels drive conical 211, 221 which are formed as bevel gear cogs and in each case are rigidly connected to torsion with bushing 21, 22 correspondent. The action connection of the gear wheels drive conical 211, 221 or bushing 21, 22 rigidly connected with these takes place by two bevel gear wheels offset 261, 262, formed also as cogwheels, which can be turned freely around the auxiliary shaft 28 and which are crimped with the conical drive gear wheels 211, 221.

The auxiliary shaft 28 is in a cross bore of the main shaft 20 and is dragged by its turn, that is rotates in radial direction. The auxiliary shaft 28 can be rotatable axially, although this does not normally have practical importance. What is essential is that the compensating gear 24 acts only when the bushes 21, 22 that are in contact with the form track does not participate equally in the transport. An inequality of this type may appear, for example when in continuous operation dirties appear due to paper fluff or the like, which would have as consequence that the form track no longer circulates exactly straight, that is, perpendicular to the separation medium cross. In this case the compensating gear 24 results in an immediate correction and guarantees with it also, in a continuous operation with running speeds typical of the Form track from 1 to 4 m / sec, reliable driving of the form track.

A preferred control or regulation of main shaft drive 20 is represented in the diagram of Fig. 3. Here the electric motor that gives rise to the drive in such a way that the form track initially at rest, it is accelerated during a start-up phase B_ {acc} and then it is conducted, with a constant speed, at along the movement or advancement phase B_ {mov}, until the start of the braking phase B_ {br}. For the regulation of drive is disconnected, according to one embodiment preferred operation of the device according to the invention, in the transition from phase B_ {mov} to phase B_ {br} and the process of braking is dimensioned with it in such a way that the track of form is positioned exactly in position, for example controlled in the usual way by printed marks, in the middle of cross separation.

\hbox{accionamiento.}

Practically this happens in an appropriate way so that each sequentially selective advance cycle of the form track is generated by a signal that corresponds to the desired form length and initiated by marks on the form track and the regulation of the progress of the form. Form track takes place at the starting point determined by the length of the form. The reading can be initiated in a manner known per se, for example by optical reading of the mark on the form track. The movement is controlled by a regulation electronics, which compares the real value of the position of the starting point with its theoretical value and carries out, from its difference, the regulation of the

 \ hbox {drive.} 

Fig. 4 shows a sectioned part of the conduction 42 of a device according to the invention with the track of form 43 above, which has a center line M and a width B. The lines 45a, 45b of the margin are arranged to a distance L in the direction of travel (arrow A) in front of the driven roller 44, where the distance L is preferably at less equal to the width B of the track 43. The rollers of imprisonment 49a, 49b are arranged symmetrically with respect from the center line M of the form track and press the form track, in the area of friction lining, against the roller, which is connected by axis 40 with the drive 46 and which controls or regulates in drive the roller in the manner explained above.

The embodiment described above serves as an explanation and as a limitation of the invention and offers, in generally, a device for processing the at least one form track by continuous or cyclic advance and cut to minus one form hint; the device has at least one conduction that fits into a means of transverse separation for at least one form track. When you have to process more of a form track, the number of conductions is naturally older; the device has means to control the advance of the form track and at least one driven roller, which extends transversely with respect to the work direction along the working width of the device and that interacts with at least one clamping device, by example one or two non-driven accompanying rollers; the roller driven has a through main shaft, which is connected only on the one hand with a drive for the rotation of the main axle through; this main axis carries at least a couple of cylindrical bushings that can rotate around the main shaft which are in action connection with each other through a mechanical compensating gear or acting otherwise.

In the description above they are represented some preferred embodiments of the invention. Without However, it is understood that this is about specifications not limiting, but for explanatory purposes only. The materials indicated special and device elements as well as construction or operating parameters can be modified in largely, based on the idea of the invention, within the framework of technical knowledge.

Claims (7)

1. Device (1) for processing, by cyclic and controlled advance, and cutting of at least one form track (B_ {1}), said device comprising at least one conduit (12) for the form track that runs towards the transverse separation means (11) and said device comprising means (17; 162) for controlling the advance of said at least one form track, characterized in that the device for advancing the form track comprises at least one driven roller (182), which extends transversely with respect to the working direction on the working width of the device and that interacts with at least one clamping device (192a, 192b), in which the driven roller has a main axis ( 20) through which, only at one of its two ends (201), is provided with a drive for the rotation of the main through axis; and in which the main shaft (20) has at least one pair of cylindrical bushings (21, 22) that can be rotated around the main shaft, which are in action connection with each other by means of a compensating gear (24). Device according to claim 1, characterized in that the compensating gear (24) is a mechanical gear, which has two drive bevel gear wheels (211, 221) and two bevel gear compensation wheels (261, 262), being each of the bevel gear wheels rigidly connected to the torsion with the corresponding bushing (21, 22) and the two bevel gear wheels being arranged with the possibility of turning around a transverse axis (28), which it is connected to the main axle, in which each of the drive bevel gear wheels is crimped with two bevel gear wheels offset. Device according to claim 2, characterized in that the drive and / or compensation bevel gear wheels (211, 221; 261, 262) are formed as toothed bevel gear wheels. Device according to one of the claims 2 or 3, characterized in that the drive and / or compensation bevel gear wheels (211, 221; 261,262) are self-lubricating, for example thanks to the fact that, at least on their surfaces which are crimped together, they are made of self-lubricating polymers. 5. Device according to one of claims 1 to 4, characterized in that each of the bushings (21, 22) is coated with friction surfaces (219, 229) made of an elastic material such as rubber, for example with a Shore hardness A of 80-100. Device according to one of the claims 1 to 4, characterized in that the friction surfaces are made of a practically rigid material and have a structured surface, for example roughness, especially by means of a hard material of fine adhered grain. 7. Device according to one of claims 1 to 6, characterized in that each conduit (12) for the form track (B_ {}} has two contact points (13a, 13b) opposite each other to be in contact with the two sides of the form track and the contact points are arranged, in the direction of passage, distanced from the roller (182), at least the working width of the device.