Patent GB-1213508-A (GB)
Title: Camera film transport mechanism
IPC: G03B17/42
Filed: 1968-10-02
Abstract: 1,213,508. 508. Camera mechanisms. BALDA WERKE PHOTOGRAPHISCHE GERATE UND KUNSTSTOFF R. GRUTER K.G. Oct.2, 1968 [Oct. 7, 1967], No.46748/68. Heading G2A. Mechanism is provided in a camera whereby a rotary member operates the film transport frame by frame, at the same time cocking the shutter and rotating the flash-cube holder. The rotary member is a wheel 14, which can be operated manually, and which engages the holder 11 for the take-up spool. The wheel has two inner rings of teeth 17, 18. It is mounted just below a plate 21 riveted to the camera housing 2. On the under side of the plate is a generally kidney-shaped cam groove comprising two curved slots 25, 27 joined by curved ends 24, 26. The cam groove receives one end of a pin 28, the other end of the pin being entrained by the teeth 18 of wheel 14. Intermediate its ends, the pin passes through, and is fixed to, one end of a track arm 29. The other end of track arm 29 is pivoted at 30 to a lever 31 extending from a rotary shutter-cocking member 32. An arm 33 integral with member 32 engages with teeth 34, 35 of a flash-cube holder 36. Centrally of track arm 29 is a hook-like abutment 38 which in certain positions can engage against part of a feeling slide 40, the slide being movable transversely to the direction of advance of the film 43. A finger 41 of the slide can engage against the film. Fig.1 shows the position immediately after an exposure has been made. The pin 28 is at the extreme left-hand end of the cam groove (engaged between two teeth of the ring 18), and the track arm 29 is extended leftwards as far as it will go. Clockwise rotation of wheel 14 (as seen in Fig.1) causes the track arm to move to the right as pin 28 traverses the upper curve 25 of the cam groove, until it reaches the other end of the groove, at 26. At this point the track arm has pivoted the lever 31 and member 32 round to the position of Fig. 2, so that the shutter has been cocked and the flash-cube socket rotated through 90 degrees. As pin 28 passes round the bend 26 into the lower curve 27 of the cam groove it is pulled to the left along that groove by a return spring 60. During this movement its front end 59 engages and pivots a catch lever 53 anti-clockwise, so that a detent 55 on the catch lever is disengaged from an aperture 45 in the feeling slide, Fig. 1 to Fig.2. The slide can now move downwards urged by a spring 61 until the finger 41 engages against the film, Fig.2. In this position the abutment 38 engages against slide 40 to prevent any further movement of track arm 29. As film 43 continues to move, with continued rotation of wheel 14, finger 41 eventually engages and penetrates into a perforation. This further movement of slide 40 causes a locking lever 78 to pivot until a detent 82 at one end engages with external teeth 16 on wheel 14 to prevent further rotation. Track arm 29 is now also freed to continue its movement leftwards until the original position of Fig.1 is reached again. An arm 77 of lever 78 co-operates with a nose 76 on the release button 75 to prevent an exposure being made until the film has been fully wound on.