DE60306657T2 - Method for setting up and transferring at least two different patterns from a transfer film - Google Patents

Abstract

The method involves moving a conveyor belt at a constant speed equal to that of a substrate (c) during transfer of patterns. Moving time of the belt is subtracted from a time between passages of two similar marks of zones in the belt. The value of displacement of adjacent patterns between respective locations is compared with a length calculated between the adjacent patterns, to coincide the transfer of the patterns with respective locations on the substrate.

Description

The The present invention relates to a method of arranging and transferring of at least two different patterns coming from a feed belt be cut out, which is a sequence of at least two specific Areas, one for each pattern, on a substrate in strip form, which with constant speed is driven, with the feed belt with a constant speed is driven, that of one of the substrate in ribbon form during the transmission each of the patterns is the same, and according to a velocity profile, which between two transfers the pattern is determined.

at the presses to transfer the pattern on a substrate in strip form, in particular a metallized Band, each band can transmit only a single pattern. Because it is not possible is that one and the same trajectory has multiple bands, you can therefore put only a single pattern on this trajectory.

In the EP 441 596 However, an apparatus has already been proposed for transferring from a stocker support sheet images obtained from this material to specific locations of a constant speed driven substrate in tape form. In such a device, it is obvious that the length of consumed deposit material is only a fraction of the length of the substrate in ribbon form. Now the carrier tape for storage material is formed from an expensive layer material. For this reason, in the above-mentioned document, means have been proposed for displacing comprising means for reversing the longitudinal displacement of the support material for deposit material, these means for displacing in reverse sense respectively upstream and downstream of the means arranged for transferring the Serving image of the carrier tape on the substrate in ribbon form, so that the distance between two consecutive images on the carrier tape is reduced, so that the consumption of this carrier tape can be maximally saved.

These Device allows the economical handling of the feed belt, whereas However, the control method of the band does not allow groups of different patterns, especially groups of patterns that comprise at least one hologram per group, of one and the same Dispose of supply tape and transfer.

It The object of the present invention is a solution of this To provide problems.

To For this purpose, this invention has a method according to claim 1 to the object.

thanks this process will make it possible different pattern on the substrate on the trajectory from one and the same feed tape, what you have so far on several tapes needed one and the same trajectory and what for this reason Naturally would not have can be realized. It makes it possible, to transmit holograms with all the necessary accuracy because this method is not just a precise arranging of the transfer tool in terms of allows the pressure on the substrate, but also a precise arranging of the hologram the cliché for transmitting this hologram on the substrate.

Consequently offers the method according to the invention Options, those in the field of transferring of patterns on a substrate in tape form so far unknown have been. This one can with all the required accuracy transfer at least one hologram to a group that transmits at least two, consecutive, different patterns. With the help of one and the same band, for example, in addition to one or more Holograms one or more different colored, metallized standard patterns or light diffraction transmit generating patterns. It is sufficient, to have a feed belt, which has the same number of consecutive following areas, such as patterns in a pattern group, where each successive group has the same sequence of specific ones Areas has. The lengths of these areas can unlike those chosen by holograms to be a specific one Range of pattern lengths so that one and the same feed belt for performing the transmission of different patterns can be used.

For this reason, the user must select the hybrid feed belt substantially in response to the patterns to be transferred by this tape. Therefore, one has essentially bands with 2, 3, 4 or even more specific areas. If a hologram is to be transmitted, it is formed on one of the designated areas prior to performing the transmission. Accordingly, the method according to the invention allows a precise arrangement of this hologram both with respect to the transfer tool and with respect to the position of the substrate on which it is to be deposited. In fact, the method of the invention is the most interesting in the case of hologram transmission. The transfer of other patterns requires that only the transfer tool need to be accurately located with respect to the substrate, since this pattern must be arranged with respect to a pre-run print. In With respect to the feed belt, it is only necessary that the tool cut out the pattern to be transferred in the particular area, but since this area is generally longer than the pattern, the accuracy with respect to this area is not as important as with the hologram.

The attached Drawing explained schematically and by way of example an embodiment of the implementation of Method, which is the subject of the present invention.

1 is an explanatory diagram of this embodiment;

2 Figure 12 is a graph of the respective displacements of the substrate in ribbon form and of the supply ribbon as a function of time.

One refers essentially to the scheme of 1 to explain the method according to the present invention. It shows a rotary press comprising a cliché holding cylinder 1, which in this example comprises three groups of three clichés h1, f1, g1; h2, f2, g2; h3, f3, g3 carries. The clichés h1, h2, h3 are identical, and the clichés f1, f2, f3 and the clichés g1, g2, g3 are also identical. Therefore, all groups of three clichés are made up of identical clichés, and the distances between the consecutive cliches from one group to the other are also identical, so that they are homologous groups.

Opposite the cylinder 1 is a contact cylinder or counter-cylinder 2, and between the cylinders 1 and 2, two bands bm and c pass through. The tape c forms the substrate to which the patterns cut out of the cliches h _i , f _i , g _i are transferred to the feed belt bm, which is generally formed by a metallized belt. The tape c forming the substrate may be a tape made of cardboard, in particular cardboard, which is intended to form carton blanks after the tape c has been cut into separate sheets or sheets. In the method according to the present invention, the paperboard c in use has already been subjected to various operations, the printing of which is the main process.

The transferred to this substrate Must have patterns in terms of Therefore, the previously made on this substrate pressure to be accurately arranged. Adjusting the position of the clichés on the substrate will obtained by the fact that the angular position of a cliché on the Cylinder 1 with respect a pressure carried by the substrate c is adjusted. This Process is conventional and heard not to the method according to the present Invention, however, he forms an adjustment that before any transmission of patterns on the pressure-bearing substrate takes place.

In the scheme of 1 Four groups of three distinct areas are shown, each corresponding to a pattern to be transmitted. The areas H1, F1, G1; H2, F2, G2; H3, F3, G3; H4, F4, G4 are shown in various forms, with the homologous regions of each group having the same shapes. This was done to simplify the explanation, but in reality these areas would be formed by means of more or less long rectangles having the same width as the feed belt.

In the example described, it is assumed that the regions H _i correspond to a hologram. Each hologram of the regions H _i is connected to a mark m1, m2, m3, m4 formed with the hologram and whose position is indicative of that of the hologram. For the purpose of fabricating the metallized belt bm, arranging the holograms can not be ensured with sufficient accuracy, so that the distances L _i between the adjacent marks m _i whose positions are strictly indicative of the position of the holograms can vary slightly.

On rotary presses for applying patterns to a substrate in ribbon form, as used in the embodiment of the present invention, there is a region zi which is inaccessible for making a position measurement on the supply belt bm. For this reason, it is not possible to arrange a detector for the marks m _i in the immediate vicinity of the cliché holding cylinder 1, which of course would be desirable. For this reason, a detector tl is arranged upstream of the cylinders 1, 2.

Since it is preferable to carry out the reading of the marks m _i when the supply tape shifts at a constant speed, the detector t 1 is preferably arranged at a distance from a reference plane passing through the two axes of rotation of the two cylinders 1, 2. In this reference plane, the transfer of the patterns through the clichés h _i , f _i , g _i from the feed belt bm to the substrate takes place in ribbon form c. The distance between this reference plane, which contains the axes of the cylinders 1, 2, and the detector tl corresponds to n times L, where L corresponds to a mean of the L _i variables, so that the reading corresponds to a period during which the supply band is constant Speed shifts, since this must accompany the cliché holding cylinder 1 during the transfer process of the pattern on the substrate in band form c, said cylinder 1 rotates at a constant speed. In the formula n × L of the example shown, which gives the distance separating the reference plane from the detector tl, n equals 3.

In order to save on the material of the feed belt bm, of course, the distance separating the adjacent certain areas H _i , F _i , G _i on this feed belt bm is reduced and does not correspond to that which cut out the ones from the respective particular areas on the substrate c deposited pattern separates. The difference between the distance between the two adjacent patterns on the feed belt bm and the distance between these two same patterns on the substrate in belt form c forms a constant base parameter integrated with the control processor to determine the speed profile of the feed belt bm.

Once the angular position of the cliché holding cylinder 1 has been carried out with respect to printing marks (not shown) carried by the substrate in ribbon form c, the arranging procedure according to the present invention is accomplished as follows:
The reading of the mark m1 on the supply belt bm by the detector tl is triggered in the specific angular positions of the cylinder, which correspond to the orientation of the clichés h1, h2, h3 to the plane which abuts the axes of the two cylinders 1, 2 and the corresponds to the transfer position of the holograms of the areas H1, H2, H3 from the supply belt bm to the substrate in belt form c, at the moment when the supply belt bm shifts at a constant speed.

Exactly At this time, the detector tl measures the existing deviation e1 between a reference position in which the mark m1 and its actual position. Taking assume that this deviation is e1 = -0.2 mm is. The executable Correction k1 is accordingly k1 = -e1, So k1 = +0.2 mm.

The calculated position of the next Clichés h2 by the voltage applied to the two axes of the cylinder 1, 2 Level triggers reading the mark m2, indicating the position of the hologram H2 is characterized by the detector tl. If the measured Deviation e2 = +0.1 mm, for example, becomes the new modified correction for the Position of the hologram H1 stored, that is k11 = -e1 -e2, therefore k11 = +0.1 mm.

It also becomes a first correction for the position of the hologram H2 stored, that is k2 = -E2, therefore k2 = -0,1 mm.

The calculated position of the cliché h3 by the on the two axes the cylinder 1, 2 adjacent level triggers the reading of the mark m3 out for the position of the hologram H3 is characteristic. For example a deviation e3 = -0.4 mm, will be a new, modified correction for the position stored by H1, that is k111 = -e1 -e2 -e3, here k111 = +0.5 mm. You save a modified correction for the position of H2, that is k22 = -e2 -e3, here k22 = +0.3 mm, and also stores a first correction for the position the hologram H3, that is k3 = -E3, here k3 = +0.4 mm.

The Correction k111 is used to adjust the speed profile of the feed belt bm to determine that H1 exactly with the angular position of Clichés h1 on the cylinder 1 matches.

Just at the time when the calculation determines that the cliché is aligned with the plane connecting the two respective axes of the cylinders 1, 2, the reading of the mark m4 indicative of the position of the hologram H4 is initiated. A deviation e4 is measured, for example e4 = -0.3 mm. The correction k1 is now deleted from the memory, which merely records the information relating to the marks m _i , which are located between the detector t 1 and the plane containing the axes of the two cylinders 1, 2.

The diagram of 2 illustrates the respective displacement profiles (mm) of the substrate tape c and the metallized feed belt bm as a function of time (s). Parallel to the abscissa, the substrate tape c is also shown with the stored patterns, and parallel to the ordinate, the feed belt bm with its specific areas for the storage of the various patterns.

you can observe that the respective velocities of the bands V (c) and V (bm) in the deposition of the patterns from the supply belt bm to the Substrate strip c are the same, with the respective displacement profiles of these bands c and bm are parallel. The substrate band c shifts at a constant Speed, so that its speed profile is a straight line is. If the two bands c, bm relocate at the same speed, are their profiles parallel. Between the filing of two consecutive patterns is the velocity profile of the feed belt bm in pending adjusted by the displacement that accompanies the substrate in band form c constant speed up to the point at which the next Pattern must be filed, and the much shorter displacement that the Feed belt bm has to go through to move from one particular area to the other next to move.

As has already been mentioned, no great accuracy is required for arranging these different areas, but for arranging the holograms H _i already. In this case, the velocity profile is determined by using the above-described correction mode between the detector t1 and the transmission of the hologram. It should be noted that the number n of memory lines may vary according to the work and the number of patterns of each pattern group.

The processor used to carry out the control of the speed profile of the drive device of the feed belt bm, is dependent on the average parameters with respect to the lengths L _i between the successive groups of the specific areas H _i , F _i , G _i , of the constant Program the speed of the substrate in ribbon form c and the length differences between the intervals separating the successive patterns on the supply belt bm and which separate the same successive patterns on the substrate in ribbon form c. In each measurement of the deviation between the position of a mark m _i measured in the calculated pass of the cliché h _i in the plane adjacent to the axes of the cylinders 1, 2 and a reference position for one and the same mark, the correction is added to these parameters which is to be taken into account for this deviation and which corresponds to the inverse of this deviation. All deviations of the markings which are located between the detection position and the transfer position of the holograms H _i on the substrate are added so that the correction carried out on the hologram H _i reaching the transfer position assumes a position corresponding to the cliché h _{i of} the cylinder 1 exactly matches the rotary press, if this coincides with the exact location of the pressure borne by the substrate in band form c.

In this way, each time a hologram H _{i is transferred} to the substrate in band form c, a correction of the position of the band bm overrides the standard speed profile of the control processor of the drive device, so that the hologram H _i carried by the feed belt bm exactly coincides with the cliché h _{i of} the cylinder 1 matches.

Claims (6)

A method of arranging and transmitting at least two rows of different patterns (H _i , F _i , G _i ) cut out of a feed belt (bm) on which a sequence of at least two distinct areas, one for each pattern , formed groups on a substrate (c) is arranged in a band form, which is driven at a constant speed, wherein the feed belt (bm) is driven at a constant speed, that of the substrate in ribbon form (c) during the transfer of each of the patterns is equal and according to a velocity profile determined between two transmissions of the patterns, the velocity profile being determined by measuring the time elapsed between the passes of two homologous markers (m _i ) from two consecutive groups of the two particular regions , from which time the times of the displacements of the feed belt (bm) during the transfer the length between the mutually adjacent patterns (H _i , F _i , G _i ) on the feed belt (bm) is calculated and this with the length of the displacement between the respective locations of the two successive , the same pattern on the substrate (c) is compared to match the transfer of the patterns with their respective locations on the substrate (c). A method according to claim 1, wherein the successive patterns (H _i , F _i , G _i ) are placed on the substrate (c) with respect to a previously made print. Method according to one of the preceding claims, in which a hologram (H _i ) is formed on at least one of the specific regions of each of the groups. The method of claim 3, wherein at given moments and at a given distance from a reference point from the difference between the position of each of the successive markings (m _i) which is for the position of each hologram (H _i) characteristic, and the given Distance is detected, a certain velocity profile for displacing each hologram (H _i ) is determined at the given distance by measuring the difference of each of the respective markings (m _i ) by generating a correction of the difference and adding the sum of the corrections of all marks (m _i ) which are located between the detection point and the reference point. Method according to claim 4, in which the given distance is n times the length of a group of particular ones Areas upstream of the reference point. Method according to one the preceding claims, at which the length each of the areas depending of the length the longest, desired Pattern is measured.