Patent GB-1148498-A (GB)
Title: Cartridge type sound motion picture projector
Inventor: HUGHES DAVID COLSON
IPC: G03B21/32
Filed: 1966-04-05
Abstract: 1,148,498. Cine projectors. BOHN BENTON Inc. April 5, 1966, No.15019/66. Headings G2E and G2J. A cine sound projector takes an endless film coil in a cartridge 84 which includes film transport means and a gate, the projector having a film transport drive for engaging the transport means and a claw feed mechanism, the transport drive and claw feed both being actuated by the mechanism of a driven shutter. The drive mechanism and optical system of the projector are contained in the base of a carrying case 22 which receives the horizontal cartridge 84 for projection upwardly by way of mirror 64 on to a rear projection screen which is erected when the cover 26 is raised. The collapsible screen has a carrier member 46, hinged to cover 26, which is raised by tab 50 to allow screen 52 and light shields 76 to swing down to the operative position shown. Arm 60 is hinged to cover 26 and engages mirror 64, hinged to member 46, to form a 45 degrees crossbrace. With the screen collapsed, the case 22 may be stood on edge to permit front projection on to a distant screen. Cartridge 84 has a turn-table (100) Fig. 10 (not shown) carrying an endless loop of film (L), which is fed from the inside of coil (C) via roller (102), double decked driving sprocket (106), gate (114) film distending assembly (144) which engages the film with magnetic sound pick-up head (346), and the lower part of sporcket (106), to the outer convolution of coil (C). A loop-forming assembly (124) includes loop adjusting fingers (126, 130) pivoting at (128, 132) and coupled by link (134) which is spring-urged into the operative position, the fingers being retracted to the broken-line position during projection when actuator (126c) is engaged by external pin (338). The gate (114) is vertically and horizontally positioned by cam (194) and stops (194c) against springs (120, 122) when the cartridge is inserted into its chamber, as in Fig. 13 (not shown). The gate comprises a base (116), with framing apertures (116b) and claw slot (116c), as in Fig. 11 (not shown), on which fits a plate (118). Film distending carriage (146, Fig.10), is rocked about pivot (148) when pin (342) depresses member (166d), to bring the film into contact with capstan (348) and head (346), against spring (157). Optical system. Light from lamp (196) is directed upwardly by mirror (198) as in Fig. 8 (not shown) through shutter (242) and gate (114) to projection lens (186) whose barrel (188) moves for focusing in block (190). Focusing knobs (200) turns drum (210), through cable (204), the pin (216a) entering groove (188a) to move the lens barrel. Shutter 242 is an apertured wheel (244) rim driven by friction wheel (311), Fig.6 (not shown), which also actuates the feed claw (248), Figs. 8 and 9 (not shown), pivoted at shaft (250) on a framecontrol lever (252). The claw has a two-faced cam-follower (248b) riding cams (256) and (258) mounted on the shutter wheel shaft (246). Spool and film drives comprise bevel gears (230b) and (232b), Fig. 15 (not shown), on shafts rotationally linked by pulleys (236, 238) and belt (240), both drives being driven by the shutter wheel shaft through worm gears (274, 284) and shaft (278). Motor (286) pulley drives the shaft (278) and also a blower to cool the lamp house. Control mechanism. The slid plate (314) is moved, (Figs.6 and 15), by handle (218) through lever (319) and rack and pinion (324, 322) from the stop mode to the run mode of operation. Displacement of slide (314) shifts mechanism carrier (220) towards the cartridge by means of cam (332) whereby gears (230b), (232b) drivingly engage turn-table (100) and sprocket (106), and claw (248) enters film (F) through the gate. Driving wheel (311) is also pivoted about shaft (130) to engage shutter wheel (244), and while loop-forming fingers (126, 130) are retracted, the film-distending carriage is actuated, and amplifier (364) is energized.