Photocopying – Contact printing – Machine
Patent
1987-06-22
1988-11-22
Griffin, Donald A.
Photocopying
Contact printing
Machine
G03B 2708
Patent
active
047869500
DESCRIPTION:
BRIEF SUMMARY
A Device for inserting copier web material and exposure web material into an apparatus for the continuous exposure of this material, Here, the web materials are moved by means of a belt conveyor through an entry slit that is formed by a pair of drive rollers, and through an exposure chamber with a transparent plate, to another pair of drive rollers disposed behind the exposure chamber, and from there to a separation device which separates the webs from one another. The web materials have positioning holes which can be mutually aligned. Register pins can be inserted and withdrawn from these holes by means of a lifting device.
In a known device of this type (DE-OS No. 32 20 637), the register pins are disposed on a support plate before the entry slit that is formed by a drive roll and by a deflection roll of the belt conveyor. The support plate can be moved in the direction of motion of the web materials in a straight line back and forth with respect to this entry slit. It has a support surface for the web materials. A lifting device is disposed on the support plate, and it seizes from below the web materials that are lying on the support surface. By means of this lifting device, the web material can be raised above the protruding height of the register pins.
The exposure web material, for example, contains a printing plate. With this device, it is manually placed on the support surface of the support plate, in such a fashion that the register pins are inserted into the positioning holes, and the individual webs of the web material are fixed in position in this fashion. The support plate, together with the web material that is lying on its support surface, is then moved in the direction of the entry slit until the drive rolls--which belong to the pair of drive rolls forming the entry slit--material. After the pair of drive rolls has moved the web material over a prescribed distance, for example, 5 to 10 cm, the web material is lifted by means of the lifting device, which seizes it from below, to such an extent that the register pins are no longer situated within the positioning holes and the web material can then be moved further by the drive rolls in the direction towards the exposure chamber. At the same time, the support plate is pushed back into its initial position, so as to be ready for insertion of the next web material.
The disadvantage of this device is that the parts of the web material in this device must be fixed in position in the region of the rearward edge, i.e., the edge turned away from the entry slit. The reason for this is that only in this way is it possible to raise the web material by means of the lifting device and, after the front edge of the web material has been seized by the pair of drive rollers, to remove the web material from the region of the register pins. Fixing the position in the region of the rearward edge entails slight transverse displacements of parts of the web material with respect to one another when its forward edge enters into the entry slit. Thus the dimensional precision required for copying is not guaranteed. It is particularly difficult to work with the known device when the originals being copied have slight corrugations in their surface. Consequently, working with the device requires experience and care in the insertion of the web material and in the advance of the support plate. The rather large amount of time expended in this connection impairs the output. Practically the same difficulties occur with another embodiment of the device, in which the register pins on the support plate are connected with lifting devices which make it possible to lower the pins below the support surface for the web materials. In this embodiment, the web materials indeed need not be raised above the protrusion height of the register pins; the arrangement of the register pins, however, here too is possible only in the rearward section, in some cases also in the central section, of the length of the web material, since the running plate also requires room for motion in the direction
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patent: 3814519 (1974-06-01), Zevnen et al.
patent: 4281922 (1981-08-01), Matsumoto
patent: 4423955 (1984-01-01), Powers
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