Patent GB-992593-A (GB)
Title: Cinematographic camera
IPC: G03B19/18
Filed: 1961-12-27
Abstract: 992,593. Cine cameras having cassettes. MEOPTA NARODNI PODNIK PREROV. Dec. 27, 1961 [Dec. 27, 1960], No. 46246/61. Heading G2E. In a double run motion picture camera of the kind comprising a support member for the lens and associated parts and a removable cassette containing film driving means and wherein after one longitudinal half of a film has been exposed, the cassette is rotated about an axis parallel to but off set from the optical axis through 180 degrees to enable the other longitudinal half to be exposed, means are provided to reverse the direction of the film travel automatically on reversal of the cassette. As shown (Figs. 1 and 2), the support member 6 of the movie camera accommodates a view finder 12, 13 the photo-electric cell 11 of an automatic diaphragm regulator, an exposure objective 0 and a release button 9. The cassette part 1 of the camera includes spools 40, 41 for film F, a spring motor with gear 35, and film feeding mechanism (detailed below). The cassette is rotatable on bearings 2, 4 which are dovetailed into the member 6 so that cassettes may be exchanged. Locking means 14 and 15 are provided for holding the cassette in the member 6. A catch 7 holds the cassette in either of its two operative positions. Film feed mechanism in the cassette includes two alternatively engageable claw couplings 27-29 and 28-30 which are driven by the motor 35 through axially slidable and intermeshing toothed portions 25 and 26: Toothed portions 31, 32 of said couplings are respectively coupled through gears 33, 34 friction clutches 36, 37 and shafts 38, 39 to spools 40, 41. Automatic mechanism for controlling the direction of feed according to which of its said two positions the cassette occupies includes an eccentric 5 on the pin 4, a slidable rack 20 meshing with two toothed nuts 21 and 22 mounted respectively on screwthreads 23, 24 and coupled for common axial movement only with the toothed portion 25, 26. Drive to the shutter and claw feed mechanism 18, 19 (not fully shown) is by way of a spur wheel 52 meshing with the gear 35, a bevel gear 51 rigid with the wheel 52 and a further bevel gear 53. Locking of the drive mechanism is achieved by a lug 56 on a tie-rod 57 entering the path of a pin 55 on a disc 54 coupled to the gear 53, the rod 57 being operated by the release button 9 in either of the two said cassettes position through levers 58 or 59. The claws 18, 19 are alternatively made inoperative according to the orientation of the cassette by a cam on a bearing support 3. Mechanism for locking the film feed mechanism before the ends of the film are reached includes a feeler lever 42 spring-urged into contact with the film on sppol 41 (which in Fig. will be the feedspool) and coupled through a sleeve 43 (Fig. 3) to a stopping lever 44. Near the end of the exposure of the first picture row lever 42 slips off the circumference of the remaining film on spool 41 and moves towards the rear cassette wall, thereby bringing a lug 49 of the stopping lever 44 into the path of a pin 50 on the bevel gear 51. During rotation of the cassette into position for exposure of the second row of pictures the lever 42 is returned into a position to re-engage the film on spool 41 by a rotatable sleeve 46 which meshes with the teeth of nuts 21, 22 and has a lug 47 engageable with a lug 48 on the sleeve 43. During exposure of said second row, the lever 42 is pivoted by the increasing diameter of film on spool 41 until the lug 49 re-enters the path of pin 50 at the other end of its range of movement. Means for adjusting the diaphragm regulator for taking different film sensitivities into account are disposed in the member 6 in a position only accessible when the cassette is pivoted into a horizontal position (Fig. 6-not shown). The member 6 may include a pistol grip (Fig. 5-not shown). A resilient pad may be positioned near the eye piece (cf. 64-Fig. 5 not shown).