GB1200781A - Motion picture projector - Google Patents

Abstract

1,200,781. Cine projectors. EASTMAN KODAK CO. July 21, 1967 [July 25, 1966], No.33754/67. Heading G2E. A cine projector for selectively projecting two different types of film, such as super-8 and standard-8, has a single gate assembly 42 and a single film advancing member consisting of a claw plate 38, there being a single control lever 76 which adjusts the stroke and lateral position of plate 38 and also adjusts the gate aperture size for the chosen film. Film feeding mechanism Claw plate 38 is driven through the pull-down cycle by the engagement of followers 44 with driven cam 36 and is supported by a framing plate 12 which is selectively positioned by lever 76 to adjust the stroke and position of plate 38. Spring 56 biases claw plate 38 towards plate 12, three bearing surfaces being provided by balls 54a, 54b, 54c trapped between facing recesses in the two plates. The framing plate 12 rests on two pins 24 extending from housing 10 to enter recesses 22 in plate 12, and on a shoulder of the housing which supports a flange 16 of the plate. Spring 62 urges plate 12 towards gate 42, and downwardly on to framing adjustment cam 60. In the standard-8 position, a limit-screw 72 threaded through flange 16 bears against a boss (33), Fig. 4 (not shown), on housing (10) extending through an elongated slot (34) in plate (12). For the super-8 position, lever (76) is depressed whereby a cam (80) engages a further screw (86) to displace framing plate (12) to the left, thus increasing the stroke of claw plate (38) by shifting the pivot ball (54c) away from the gate. Lateral displacement of claw teeth 40 occurs as recesses 22 are moved out of alignment with pins 24 which then rest on the flat surface of plate 12. Screw 92 extending from housing 10 engages flange 16 to provide fine adjustment of this lateral displacement. Gate and aperture adjustment Gate (42) comprises an aperture plate (120) with a film track surface at the rear and having an elongated opening (122), Fig.6 (not shown), with guide ribs (124) on which may slide a mask (140) with standard-8 and super-8 apertures (144) and (142), said mask being retained by an apertured plate (150) riveted to plate (120). Plate (120) has two integral H-shaped arms (134) which engage spring-arms (136) extending from housing (10), Fig.2 (not shown). Gate (42) may thus be swung open on arms (134) against a spring-loaded pressure plate (156) during rewind. Mask (140), Fig.2, is shifted between its two positions by a lever (170) to which it is connected by a bi-stable spring (180), lever (170) being actuated by the movement of control lever (76). Spring (180) also yields to permit opening of gate (42) by the arm (114) of a multiarmed member (98) pivoting on a closure plate (96) for the pull-down mechanism. Member (98) is released to actuate rewind mechanism by a latching lever (112).