Printing – Embossing or penetrating – Hot die machines
Reexamination Certificate
1995-05-12
2001-03-20
Yan, Ren (Department: 3307)
Printing
Embossing or penetrating
Hot die machines
C101S033000
Reexamination Certificate
active
06202549
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a process and apparatus for transferring prints from a support to a substrate, and more particularly to a process and apparatus for transferring prints from a support to a substrate having rows of print portions each including a defined surface portion.
2. Description of the Prior Art
A process for transferring a stamping foil print from a stamping foil on to a substrate and an apparatus for carrying out that process are known from DE 32 10 551 C2. That process and the apparatus are suitable for virtually endlessly impressing a substrate in the form of a flexible web of material, with a print, in the direction of forward feed movement of the substrate. The substrate may be for example a magnetic strip on a ticket or a decorative endless strip which covers a corresponding print portion, that is to say a ticket or the like, in the direction of transportation movement of the substrate from one edge of the corresponding print portion as far as the oppositely disposed edge therof.
If that known process or the apparatus provided for carrying it into effect are to be used to impress individual prints on to a substrate having print portions in succession in accurate register relationship, the distance between adjacent prints in the direction of transportation of the hot stamping foil precisely corresponds to the spacing of the print portions in the direction of transportation movement of the substrate, which is parallel to the direction of transportation movement of the hot stamfping foil. Due to that spacing between the stamping foil prints, there is between them a not inconsiderable unused empty space, that is to say stamping foil waste, and that has an effect on the economy of that known process and the apparatus provided for carrying it into effect when stamping individual images.
OBJECT OF THE PRESENT INVENTION
The object of the present invention is to provide a process and an apparatus of the kind set forth in the opening part of this specification, in which respect it is economically possible to provide a substrate having print portions in succession with individual spaced-apart prints in accurate register relationship, with the wastage of support material being relatively slight.
SUMMARY OF THE PRESENT INVENTION
By virtue of the procedure according to the invention, it is possible, in a rotatable and thus continuous mode, to provide a virtually endless substrate with at least two rows of print portions in accurate register relationship with corresponding individual prints, that is to say which represent individual images, wherein the support provided with the prints is well utilised because provided on the support, between the prints for the print portions of one row thereof, are further prints for at least one further row of print portions. In accordance with the invention therefore the wastage is relatively slight. A further advantage over discontinuously or oscillatingly operating processes for applying individual image prints to the corresponding print portions of substrates lies in the comparatively high level of productivity. Known oscillating stamping processes for stamping substrates in the form of sheets with multiple print portions achieve for example outputs of about 4000 through 6000 sheets per hour. In comparison thereto, in a rotary stamping process in accordance with above-mentioned DE 32 10 551 C2, it is possible to achieve feed speeds of the order of magnitude of 130 through 200 m/min, which when converted corresponds to about 12,000 through 18,000 sheets which can be stamped per hour. The process according to the invention makes use of the last-mentioned rotary process by means of a stamping foil or by means of a support which is provided in register relationship with an activatable adhesive. It is therefore possible for the support and the prints to be formed by a stamping foil. It is advantageous in relation to such a process if the support and the prints are formed by a hot stamping foil. In that case, the support can be transported a plurality of times through a station having a segmented heated stamping roller forming the means for the selective transfer of certain prints from the support on to the substrate, and at least one pressure roller which bears against the peripheral surface of the stamping roller. This process requires a segmented stamping roller in order actually to transfer only the respectively correct prints from the support on to the substrate while the prints disposed between same are transferred on to the corresponding substrate only after lateral displacement and the renewed feed of the support to the station.
Highly exact transfer of prints from a support on to a substrate, that is to say transfer in accurate register relationship, is afforded if, when carrying out the process according to the invention, use is made of a hot stamping foil in which the spacing of the stamping foil prints in the direction of transportation movement is shorter than the spacing of the stamping punch segments at the peripheral surface of the stamping roller, and if the hot stamping foil is stretched upstream of the stamping station in such a way that the spacing of the stamping foil prints of the or each row thereof corresponds to the spacing of the stamping punch segments. More specifically, in that way it is possible to provide for an accurately defined and exact association of the stamping foil prints with the associated print portions of the substrate to be stamped, even when the stamping roller is operating at high angular speeds.
It is helpful for the same purpose if, when using a segmented stamping roller, the rotary angular position of the stamping roller or the stamping punch segments thereof and a predetermined identification of the substrate or each print portion of the substrate can be adapted to each other by means of a regulating device. The last mentioned regulating device is desirably a so-called insetter regulating means. The identification on the substrate or each print portion of the substrate may involve suitable print marks which are detected by means of a print mark reading device and fed to the regulating device as regulating parameters. Possible side tolerances of the support with the prints or the hot stamping foil in relation to the substrate can be compensated by per se known measures such as guide rollers, in which respect support by air cushioning means or the like may also be desirable.
It has been found desirable if, in carrying out the last-mentioned process, the forward feed position of the stamping foil or the prints thereon is determined and adapted by means of the above-mentioned regulating device to the rotary angular position of the stamping station or the stamping punch segments thereof. That can be done by the above-mentioned print mark reading device which is connected to the regulating device in order for example suitably to influence a control drive with a superimposition transmission, with which the stamping roller and/or the forward feed rollers for the substrate or the stamping foil are driven.
If the process according to the invention uses a hot stamping foil, it is desirable for same to be cooled down after leaving the stamping station for the purposes of detachment from the corresponding stamped substrate and then to be fed at least one further time to the stamping station—displaced by the spacing of adjacent rows of print portions. The stamping speed can be suitably increased by such a cooling action, which has an advantageous effect on the productivity of the process according to the invention.
It has been found desirable if after leaving the stamping station the stamping foil, pivoted out of the plane of the foil through 90° of angle, is diverted around a pair of displacement rollers which are oriented perpendicularly to the stamping roller, in so doing being displaced transversely to the direction of transportation movement by the spacing of adjacent rows of print portions, and then, displaced transversely by a corresponding
Germann Albrecht
Mitsam Reinwald
Hoffmann & Baron , LLP
Leonhard Kurz GmbH & Co.
Yan Ren
LandOfFree
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