Patent GB-1030014-A (GB)
Title: Roll-film cameras
IPC: G03B17/42
Filed: 1963-07-08
Abstract: 1,030,014. Roll-film cameras. NIKOLAUS KARPF, [trading as LINHOF NIKOLAUS KARPF KOMM GES] July 8, 1963 [July 13, 1962], No. 26963/63. Heading G2A. A roll film camera has a reciprocating member which, on movement or rotation in one direction, actuates the film-feeding mechanism, and on movement or rotation in the other direction, actuates the shutter-tensioning mechanism. In the form shown, the said reciprocating member is the handle 1, rigidly mounted on a shaft 2 ending in a pinion 3 which engages a slidable rack 4. Also on shaft 2 is a sleeve 11, one end of which is connected by a clutch 12 to gearing 13, 13a which operates the film transport. A helical spring 14 on sleeve 11 connects it to handle 1, being secured to the latter at one end. Loosely mounted on sleeve 11 is a ratchet wheel 15, having teeth over part only of its periphery, and at the opposite part a tapered lug 17; ratchet and handle are connected by a ping 16. Above the ratchet is a U-shaped keeper rigidly mounted on a shaft 18, one arm 19 of the keeper being normally biased into contact with the ratchet by a spring 22. Fig. shows the position before the shutter is released, which is effected by pushing shaft 31 in the direction of the arrow. A pin 32 on shaft 31,which engages against the sloping edge of a slot 33 in a slide 25, pushes the latter down against a spring 27. This disengages a lug 26 on the slide from a recess 29 in a bush 28 on a shaft 9, and allows the latter to turn. Shaft 9, which is coupled by a key 10 to the shutter-operating mechanism (not shown) is connected by a pinion 8 to a rack 6. In Fig. 1, rack 6 is held in a raised position, against a spring 7, thus supplying the shutter tension. When lug 26 disengages from bush 28, rack 6 is pulled down by the spring, so operating the shutter. Handle 1 is now given a partial clock-wise turn. Slide 25, in moving downwards, has allowed pin 23, and hence shaft 18, to turn under the action of spring 22, so that arm 19 of the keeper is brought into contact with the teeth of ratchet 15; thus as handle 1 turns through its clockwise rotation, it cannot be turned back. This operation causes pinion 3 to raise rack 4, and hence rack 6, the two racks having engaging lugs. This turns pinion 8 and hence shaft 9, until the lug 26 can once more lock into the recess 29 as slide 25 moves upwards again under spring 27. The shutter is thus tensioned once more. During this movement of handle 1, the helical spring 14 has been opened sufficiently for it to slide over sleeve 11, which hence does not turn. As slide 25 completes its upward movement, it moves pin 23, hence turning shaft 18 and the keeper so that arm 19 disengages from the ratchet teeth. This allows handle 1 to be turned back again in the reverse direction. This time helix 14 grips sleeve 11, and so turns the clutch 12 and gears 13 and 13a, so winding on the film. Rack 4 is at the same time wound downwards again, disengaging from rack 6 which remains in the tensioned position. The tapered lug 17 strikes the other end 21 of the keeper which is formed as a resilient spring arm, flexes it to one side, and drops in behind it, so preventing further operation until the shutter has been released again. A hole 34 is provided in rack 4, such that the shutter release shaft 31 can operate only when aligned with the hole. Thus during the whole forward and backward movement of handle 1, with the consequent up and down movement of rack 4, shaft 31 cannot operate; only when the shutter has been re-set and the film wound on is hole 34 aligned with shaft 18 again, allowing the shutter to be released once more.