Photocopying – Projection printing and copying cameras – Detailed holder for original
Patent
1976-10-05
1978-03-21
Griffin, Donald A.
Photocopying
Projection printing and copying cameras
Detailed holder for original
G03B 2762
Patent
active
040800709
ABSTRACT:
A record copying platen suitable for copying records such as a book where part of the record is of a different thickness to the other part, the platen consisting of two separable platen members each constrained to lie next to each other in parallel planes, the distance between the planes being variable; in one embodiment the platen members are linked by a parallel link arrangement, one of the links being pivotally mounted to a base and in which the pivot can be moved along that link so as to enable the device to balance with more weight on one platen member than the other; a second embodiment has a resilient arrangement to urge the platen members upwards, and a further resilient means for assisting the upward bias of the platen members and the further resilient means has an adjustment for adjusting the tension in the means so that different weights of record can be accommodated and the platen members urged upwards into a copying plane; a third embodiment has a hydraulic arrangement for urging the platen members upwards and for balancing the platens, the hydraulic arrangement consisting of a cylinder under one platen connected to a similar cylinder under the other platen, an adjustment arrangement to cater for different heights of record being provided by means of a third cylinder having an adjustment piston which can be locked in several positions.
REFERENCES:
patent: 1267358 (1918-05-01), Beidler
patent: 2323600 (1943-07-01), Heybourne
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