Patent GB-392094-A (GB)
Title: Improvements in or relating to kinematograph apparatus
IPC: G03B1/04
Filed: 1932-11-19
Abstract: 392,094. Kinematograph apparatus. KODAK, Ltd., Kingsway, London.- -(Assignees of Wellman, H. C. ; 333, State Street, Rochester, New York, U.S.A.) Nov. 19, 1932, No. 32749. Convention date, Nov. 20, 1931. [Class 97 (i).] In a camera or projector reverse winding is effected through mechanism comprising a driving member alternatively engaged, for winding and for reverse winding, with one of two driven wheels operatively connected to gether, and a third driven wheel is capable of being moved into engage. ment with the driving member, when it is out of engagement with both the other driven wheels, to effect quick rewinding ; means for holding the driving member when it is out of engagement with the first mentioned driven wheels, so as to facilitate threading or to permit prolonged exhibition of one image, may be provided. As shown in Figs. 3 and 4, friction wheels 27, having meshed gears 29, 30 secured to their spindles, are alternatively engaged by a driving wheel 24 which is driven through a belt 21 and pulley 22 by a motor. The wheel 24 is carried by a bracket 25 which may be rocked about a pivot 26 by a rack 44, pinion 45, and handle 47, and has a pin and slot connection with a snap-over device comprising an arm 35 pivoted at 36 and pulled by a spring 40 connected to a stud 41 on the bracket 25. The arm 35 moves in an arcuate guide 42, and snaps to either end position when the bracket is rocked to change the driving engagement, or sinks into a recess 43 to hold the wheel 24 in a mid-position out of driving engagement. The shaft 31 carrying the gear 30 also carries a flywheel 75, a cam 85, Fig. 11, forming part of a claw-feed mechanism, and a gear 32 meshing with a gear 77 on a shaft 78. The shaft 78 carries an eccentric pin, also forming part of the claw-feed mechanism, a screw pinion 81 driving a shutter shaft 80, and a pinion 86 meshing with a gear 87 on a shaft 88. Upper and lower film sprockets 14, 17 are respectively driven from the shaft 88 by gears 100, 101, and by a chain and chain wheels 89, 91. The lower spool is driven by a belt from a pulley 93 on the shaft of the lower sprocket, and the upper spool is driven, during reverse winding, through a free wheel device, by a belt from a pulley 103 on the shaft of the upper sprocket. A hand wheel on the shaft of the lower sprocket permits adjustment of the film as desired, for single-image projection, when the bracket 25 is in its mid position. Quick re-winding of the film may be effected by means of a friction wheel 23, Fig. 4, turning with the wheel 24, and engaging a third driven wheel 50 when the bracket 25 is in its mid position. The wheel 50 is carried by a bracket 51 mounted on a pivot 52 and is normally held in a raised position, so that the wheel 50 cannot engage the wheel 23, by a spring latch 62 pivoted on it and engaging a fixed shelf 63. The latch may be manually operated to permit a spring 58 to pull the bracket 51 downwards, and the bracket 51 has a shaped surface 70, Fig. 6. A recess 71 in the surface 70 engages the stud 41 on the bracket 25 when the bracket 51 is pulled downwards, and when the bracket 25 is in mid position, and permits engagement of the wheels 23, 50. Movement of the brackets 25 from the mid position causes the stud 41 to ride over one of two projections from the surface 70 and raise the bracket 51 so that the wheel 50 disengages from the wheel 23. The latch 62 then holds the bracket 51 in raised position. The shaft of the wheel 50 carries a belt pulley 53 connected by a second belt 54 and pulley to the top spool, and drives it for quick rewinding, the drive for normal reverse winding being freed by the free wheel device incorporated in it. The wheels 23, 24, 27, 50 may have cork edges engaging V-grooves, as shown, or may consist of toothed gears.