Patent GB-489508-A (GB)
Title: Improvements in or relating to kinematographic apparatus
IPC: G03B21/43
Filed: 1937-02-03
Abstract: 489,508. Kinematograph projectors. KODAK, Ltd., and NAGEL, H. Feb. 3, 1937, No. 3163. [Class 97 (i)] In a projector wherein the spools are alternatively driven from spaced parallel shafts interconnected so as to be driven in opposite directions, a control member is provided between the shafts and has a plurality of cam parts selectively acting on clutches to effect winding or rewinding ; the speed of rewinding may be greater than that of projection, the projector lamp may be out of circuit during rewinding, and the member may also control reverse projection and prolonged projection of a single image. As shown, spool spindles 8, 10 are respectively connected by pulleys 33, 25, 35, 26, and belts, to parallel shafts 27, 28, under the control of clutches comprising pins 39, 41 engaging slots in the loosely-mounted pulleys 25, 26 and carried by plungers 36, 37 axially movable in the shafts 27, 28 against the action of springs 38. A control member 44, rotatable on a shaft 45 by a handle 68, has raised and depressed portions on its face to control the plungers, and also has edge portions 73, 81, 86 at different radial distances to control a lever 60, pivoted at 61, through which the drive of the projector mechanism is reversed or stopped. The lever 60 engages a bracket 49 which is pivoted on a pin 50, and carries friction wheels 51, 52 engaging one another. Either of the wheels 51, 52 may engage the edge of the projector shutter 31 to transmit the drive from a motor 55 to the mechanism, the wheel 52 being connected by pulleys and a belt 53 to the motor, and the shutter 31 being mounted on a shaft 19 having a worm driving worm wheels 29 on the shafts 27, 28 in opposite directions. The member 44 is also provided with a projection 66 to engage arms 75, 80 of a switch which, in the alternative positions of its arm 65, Fig. 4, either shortcircuits a variable resistance 64 in the circuit of the motor 55 and cuts out the projector lamp 23, or brings both the resistance and lamp into circuit. The parts, as shown, are in rewinding position, the face surfaces 47, 77 on the member 44 causing the pulley 25 to be clutched to its shaft and the pulley 26 to be declutched, the edge portion 73 of the member 44 causing the wheel 52 to engage the shutter, and the switch arm 65 having been thrown into the full line position in Fig. 4. The diameters of the pulleys 25, 33, and the cutting out of the resistance 64, with a resultant increase in the motor speed, cause rewinding to be effected at high speed. Movement of the handle to position P, Fig. 2, places the parts in projecting position, the pulleys 25, 26 being then respectively declutched and clutched, the wheel 52 being permitted to remain engaged with the shutter, owing to the length of the edge portion 73, and the switch arm 65 being in the broken line position in Fig. 4, owing to the throwing over of the arm 75 by the projection 66. For prolonged projection of a single image, the handle is moved to position S ; the edge portion 81 of the member 44 then tilts the lever 60 and bracket 49 so that neither wheel 51 nor wheel 52 engages the shutter, and the drive is stopped. Reverse projection is effected by moving the handle to position RV. The pulley 25 then remains declutched from the shaft 27, but a surface 83 on the member 44 causes the pulley 26 to be declutched from the shaft 28, and a pulley 58 to be clutched to it. The pulley 58 drives the pulley 25 through a belt 59, and thus the spool spindle 8, the pulley diameters being such that the spool is driven at normal take-up speed. The edge portion 86 of the member 44 causes the bracket 49 to be tilted sufficiently to engage the wheel 51 with the shutter, and thus to reverse the direction of drive of the projector mechanism ; the switch arm remains in the broken line position shown in Fig. 4. Intermittent feed is effected by a claw 14 pivoted at 15 and controlled by cams 17, 18 and a spring 16.