Patent GB-1278170-A (GB)
Title: Photographic camera incorporating an alternating feed and exposure lock
IPC: G03B17/42
Filed: 1970-05-01
Abstract: 1278170 Cameras BALDA WERKE PHOTOGRAPHISCHE GERATE UND KUNSTSTOFF R GRUTER K G 1 May 1970 [2 June 1969] 21009/70 Heading G2A A locking arrangement for ensuring alternate shutter release and film feed in a flash-cube camera as disclosed in Specification 1186508 is modified by the provision of a locking slider 22 which is integral with a guide-plate 23. Figs .2 and 3a show the position after the film has been wound on and the camera is ready to make an exposure. The slider is urged to the right, as seen in Fig.3a, and a finger 23' at one end of plate 23 passes through a bore 25 in a supporting partition 26 to enter a perforation 24' in the film 24. The slider has engaged one of a series of teeth 33 round the periphery of a film winding wheel 2, so locking it against further rotation. The shutter release 17, urged upwards into the position shown in Fig.3a by a spring, has a locking lug 34 which in the position shown is clear of wheel 2. Below lug 34 extends a projection 35. At the other end of plate 23 is a triangular cam 30, which extends through an opening in a plate 29 which supports the release 17, and also through an opening in the release itself having an edge 31. When release 17 is pressed, the edge 31 engages cam 30 and so moves the slider 22 and plate 23 to the right, Fig.3a. Slider 22 is moved out of locking engagement with wheel 2, but before this happens lug 34 has entered into engagement with another tooth of wheel 2, so that this is still locked. When slider 22 has reached its alternative position, it is locked there by a spring-loaded lever 16, see also Fig.1 (not shown). The slider is of a resilient nature, so that as release 17 returns to its rest position after the shutter release has been effected, the slide latches under the projection 35, and so prevents a further release movement. The film is now wound on by rotating the wheel 2, which at the same time rotates the flash-cube holder which carries a disc 9. One of the four projections 10-13 comes into abutment with a lug 38 on lever 16 and pivots it (anti-clockwise), Fig.1 (not shown) until it comes into contact with a fixed stop 1". Further rotation of the flash-cube is prevented, but a slipping clutch arrangement allows the film transport to continue. At the end of its pivoting movement lever 16 releases the slider 22, which is drawn back into contact with the moving film 24. When the finger 23' once more enters a film perforation, the slide can be drawn back completely so that it once more enters into locking engagement with wheel 2. A counting arrangement is provided, Fig.6a (not shown) for counting the number of flash-bulb exposures. A counting slider (39) having a number of driving teeth (40') is normally out of the range of movement of slider 22 until a flash-cube is inserted into the holder which then brings it into the said range of movement. When the release is pressed the slider 22 is deflected by projection 35 into engagement with one of the teeth (40'), and on the release returning to its rest position the slider swivels under the lug 34 and so pushes the counting slider along the width of one tooth. After the last flash has been fired, a lug (50) on the counting slider engages in the wheel 2 and locks it, until the flash-cube is removed from the holder.