G - Physics – 03 – B
Patent
G - Physics
03
B
88/76
G03B 41/10 (2006.01)
Patent
CA 1097961
ABSTRACT OF THE DISCLOSURE A mirror mechanism for a continuous-movement cinematograph film projector is described. The projector has means for driving the film continuously and a drive shaft driven in synchronism with the film. The mirror mechanism comprises a compensating mirror; a pivot axis about which the mirror oscillates; a lever arm coupled to the mirror to oscillate the mirror; a cam-follower portion on the lever arm; a cam having a profile on which the cam- follower portion rides; a spring for urging the cam-follower portion into contact with the profile of the cam; a slipping clutch for coupling the cam to the drive shaft and allowing the cam to be arrested while the drive shaft continues to rotate; a blocking member having a blocking position where it engages the cam and a release position where it is clear of the cam. The cam is arrested by the blocking member when in the blocking position; and a solenoid which, when ener- gised by an electrical release pulse, withdraws the blocking cam to the release position to release the cam.
291239
Macrae & Co.
Vireco A.g.
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