Photocopying – Projection printing and copying cameras – With film severing
Patent
1984-10-11
1986-08-12
Hayes, Monroe H.
Photocopying
Projection printing and copying cameras
With film severing
355 74, G03B 2900
Patent
active
046053000
ABSTRACT:
A roller-blind shutter (32) comprises two shutter-curtains (35,36) with accompanying shutter-rollers (33,34) adapted to be driven by stepping motors (M3,M4). The strip-material (6) is transported and positioned, along the path of travel of the said shutter-curtains, by a positioning roll (14) also driven by a stepping motor (M2). The stepping motors (M2,M3,M4) are controlled digitally by pulses from positioning devices. Prior to exposure of a section of strip by a projected picture (31), the strip-material is positioned in such a manner that its leading transverse edge (6k) is spaced by half a frame-length from the optical copying axis (OA). In order to make an exposure, the said shutter-curtains are moved consecutively in the same direction, so that the closing edges (35k,36k) thereof expose and then cover the said section of strip. The one edge (31uk) of the exposed picture (31) is formed by the transverse edge (6k) of the strip-material (6), while the opposing edge (31 ok) is masked by the shutter-curtain (35) located on the other side of the optical copying axis (OA). In the exposure-position, the closing edge (35k) of this shutter-curtain (35) is spaced by half a frame-length from the optical axis of the picture (OA). The device may be adapted to different frame-lengths by altering the program of the positioning devices.
REFERENCES:
patent: 2927503 (1960-03-01), Zollinger
patent: 3467469 (1969-09-01), Hastings et al.
patent: 3500734 (1970-03-01), Lewis et al.
patent: 3503317 (1970-03-01), Johnson
patent: 3689149 (1972-09-01), Livingood
Hayes Monroe H.
Prontophot Holding AG
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