Patent GB-719454-A (GB)
Title: Improvements in or relating to mechanisms and their lubricating systems
IPC: G03B19/18
Filed: 1950-07-20
Abstract: 719,454. Kinematograph apparatus. INTERNATIONAL PROJECTOR CORPORATION. July 20, 1950 [Nov. 25, 1949], No. 18132/50. Class 97(1) [Also in Group XXXIV] A driving mechanism and lubricating system therefor comprises film-operating means including a continuously-rotating drive shaft, an intermediate shaft, and a driven shaft journaled in a housing, a rotary gear pump with gears affixed respectively on the driven and intermediate shafts, and a lubricating system for discharging lubricant to a part or parts of the film-operating means, for dissemination to parts of the mechanism. In the construction shown, a projector head of a motionpicture projecting machine is divided by a frame 11 into two chambers, one housing the film and the other housing driving mechanisms. In the latter chamber a motor driven shaft 16 carries a gear 15 in mesh with a gear fast on a countershaft 14, which supplies power to the operating devices of the projector. A centrifugal governor on the upper end of the shaft 14 includes pivotally-mounted weighted arms 25 connected by a spring, 26. Fingers 28 extending beyond the pivoted ends of the arms 25 engage beneath the head of a plunger 29 loosely seated in a socket in the shaft 14. The plunger is maintained in raised position when the shaft 14 is not rotated whereby a spring-pressed lever 30 is caused to hold the usual fire shutter (not shown) across the projection aperture. As the shaft 14 rotates the aperture is uncovered. The governor as it rotates acts to disperse oil from a pipe 49 communicating with a vaned eccentric disc pump 42 driven from the shaft 16. The oil is drawn into the pump through an inlet pipe 41 provided with a filter 43. The frame 11 is formed with a circular opening 60 constituting a bearing for a circular cam ring 61 which, has an eccentrically-located bore 62 to accommodate a cylindrical casing head 50. The head, which is secured to the cam ring 61, is connected by an arm 65 of arcuate cross-section to a bearing yoke 66. The head 50 has a chamber 64 to accommodate Geneva cam and star wheel mechanism. Openings are formed in the head 50 and yoke 66 for bearings of a cam shaft 74 and a shaft 67. The shaft 67 has a gear 86 driven from a gear 85 on the counter-shaft 14, and transmits motion through helical gears 87, 88 to the cam shaft 74, whereby star wheel 81 is advanced step-by-step. The wheel 81 is carried by a shaft 80, on which is fast a sprocket wheel 82 carrying the film. The casing head 50 and shaft 74 may be adjusted around the axis of the shaft 67 by manual operation of a knob 90 to advance or retard the film for framing purposes. The intermittent movement inside the chamber 64 is lubricated by part of the oil dispersed by the governor 25, the oil passing through a funnel 100 and a pipe 101 to the helical gears 87, 88. The gears are partly housed in a cradle 102 so that they can function as a gear pump and force the oil through passages 103. 104 to the chamber 64. Fart of the oil passes, along an axial passage 108 in the shaft 80, returning to the casing by way of a radial passage 109, a helical groove 110, and outwardly extending flutes or ducts 113, which may be radial, tangential, or radially inclined. The flutes are formed on a collar 111 integral with the shaft 80 and are connected with the groove 110 by an annular groove 112. The bearing 68 for the shaft 67 is formed with peripheral grooves 114 from which ,the oil in the chamber 64 can overflow to the oil sump. Specification 719,491, [Group XXXIV], is referred to.