Patent GB-1206964-A (GB)
Title: Document copying apparatus
IPC: G03G15/00
Filed: 1967-10-06
Abstract: 1,206,964. Electro-photographic copying machines. RANK XEROX Ltd. Oct.6, 1967 [Oct.13, 1966 (4)], No.45729/67. Heading G2H. An electro-photographic copying machine for producing copies of original documents on copy sheets, comprises multiple object planes each adapted to maintain an original document, multiple imaging apparatus for illuminating and projecting and original document at each of the object planes, light directing means movably positioned to cause image rays of one original to strike a light sensitive plate and prevent light rays emanating from the remainder of the object planes from striking the light sensitive plate. General Arrangement As shown, two platens 12 and 14, Fig. 2, for receiving original documents are provided; the platen 12 supports a standard original not requiring enlargement, while the platen 14 supports a semimicro original requiring enlargement of about 3X. A slot aperture 18 is arranged above a xerographic drum 10 having charging, exposure developing transfer and cleaning stations A, B, C, D and E respectively. Exposing Originals The original on the platen 14 is scanned by lamps 50, Fig. 10 and a lens 54 is synchronism with the drum. Similarly, an original on platen 12 Fig. 2, is scanned by lamp 42, Fig. 11, and a lens 46 (and by a mirror (44) Fig. 4 (not shown) the image beam being reflected by a mirror (48) movable to a second position, out of the image beam, when producing copies of a semi-micro original on the platen 14 Fig. 2. The platen 14, Fig.5, has a rigid cover 96 having a transparent portion 100 of glass with alignment marks 102 to indicate the effective copying area. The clearance between the portion 100 and the platen glass 90 is less than the thickness of the original to ensure pressure on the original when the cover is lowered. A registration member 104 is slidable in a groove 106 of the cover 96 while a second memeber 108 is slidable in a groove 112. The registration members 104 and 108 may be fitted in a grove 114 of the cover 96 when using cards having images reduced 2À753X. The lamps 50 and 42, Figs. 10 and 11 are mounted in carriages 52 and 120. The carriage 120 is controlled by cables (128) (130) Fig. 6 (not shown) and a pulley (126). Lens 46, Fig. 11 is carried in a carriage (132) Fig. 4 (not shown) slidable by wheels (134) on a rod (72) and actuated by a drive cable 138, Fig. 11 and pulley 136. A pulley (144) Fig. 6 (not shown) drives the lamps 50 and lens 54, Fig. 10, through cables (142) (146) Fig.6 (not shown). The magnification produced by lens 54 may be varied by changing the lens and varying the speed of cable (146) by a change of pulleys (150, 152) Fig.6 (not shown). The pulley (144) clamps cable (142) and into effective decimeter is variable by moving sides (174) and (176) Fig.8 (not shown) relatively axially of shaft (154) by rotations of nut (180), thus allowing adjustment of the scanning speed of the optical system. Pulley (126) and (136) are constructed similarly to pulley (144). The synchronized movement of lenses and light sources in the scanning direction is obtained by a scan control mechanism, the lenses and light sources being returned rapidly to their starting - position after a scanning operation. A shaft SH-1, Fig.2, carrying the drum 10 carries a spring arbor 206, Fig. 7, for producing the rapid return movement of the lenses and light sources. A flat coil spring 210 encircles the hub of arbor 206. A normally de-energized scan releases solenoid SOL-1 holds a pawl 246 adjacent, but disengaged from a ratchet wheel 228. When solenoid SOL-1 is energized by a micro-switch, (not shown), pawl 246 engages ratchet wheel 228 to cause rotation of lamp scan pulley 126. Pawl lever 248 strikes a trip pin 250 to disengage the pawl at the end of the cycle and permit the rapid return movement. The optical system for reproducing semi-micro originals requiring enlargement is as disclosed in Specification 1, 206, 966. While sheet delivery apparatus may be as disclosed in Specification 1,206,965.