Patent GB-1183063-A (GB)
Title: Photographic Camera and Film Magazine Therefor
IPC: G03B19/04
Filed: 1967-05-05
Abstract: 1,183,063. Cameras; film magazines. VOIGTL NDER A.G. May 5, 1967 [May 7, 1966], No. 21065/67. Headings G2A and G2E. A film magazine comprising a film supply chamber 2 and a film take-up chamber 3 interconnected by a film guide track 4 having an exposure aperture 9, is provided with an electric current source 12 arranged within the chamber 2 and connected to contact elements 15, 16 mounted on the outside of the chamber 2. A slot 11 and an opening 57 in the guide track 4 adjacent the aperture 9 register respectively with a perforated portion and non-perforated portion of the enclosed film. The magazine may be of the type used for separate photographs or of the cine camera type. A camera adapted to receive the film magazine includes a motor arranged in a housing 38 and having an electrical connection with two contact plates (41), 42 which are positioned to engage the elements 15, 16, when the magazine is inserted. Three switch contacts 45, 46, and 51, 52 are arranged in series in the electric circuit. When the magazine is inserted, the first switch contact 45 is closed by a plunger 55 which passes through the opening 57 and is forced against spring pressure by contact with the unperforated portion of the film. The switch contact 46 is closed when the camera back wall is shut. The double switch contact 51-52 comprises a contact spring 66 which co-operates with two coupled contact springs 51<SP>1</SP>, 52<SP>1</SP> in such a way that the contact 51 is normally closed. A switch element 69 is coupled by a pin and slot connection 70-71 to the camera body and comprises an arm 73 which extends through the slot 11 of the film magazine to engage the perforated portion of the film. The element 69 is urged by a spring 72 into the position shown in Fig. 4 in which the arm 73 abuts a stop 74 in the camera housing and in which the coupled springs 51<SP>1</SP>, 52<SP>1</SP> are moved by the element 69 to close the switch contact 52. Thus with the switch contacts 45, 46, 52, closed the motor operates to advance the film until a perforation 6<SP>1</SP> corresponding to the first image frame registers with the arm 73. The arm 73 is urged by the spring 72 to drop into the aperture 6<SP>1</SP> and the element 69 is rotated by the continued movement of the film until the element is withdrawn from the spring 52<SP>1</SP> and the contact 52 opens. The contact 51 is simultaneously closed and the electric motor is short-circuited and thus stopped. A shutter release may then be operated to effect exposure of the image frame. Movement of the shutter release rotates a switch lever 58, counterclockwise as viewed in Fig. 4 about its pivot point 59. The switch lever 58 co-operates with the switch element 69 and withdraws it from the perforation 6<SP>1</SP> after which the element 69 returns to the position shown in Fig. 4 under the action of the spring 72. As the switch lever 58 is rotated it also displaces a contact spring 45<SP>11</SP> of the switch contact 45 and opens the latter so that the motor is still inoperative although the switch contact 52 has been reclosed. When the shutter release returns to its initial position the switch lever 58 is free to rotate under the action of a spring 60 so that the switch contact 45 will close the circuit to the motor to advance the film for the next exposure. When the film end passes the plunger 55 the latter is urged into a recess 79 behind the opening 57 to open the switch contact 45 and stop the motor.