Patent GB-221829-A (GB)
Title: Improvements in or relating to photographic cameras
IPC: G03B19/04
Filed: 1924-09-12
Abstract: 221,829. Zsigmond, A. Sept. 13, 1923, [Convention date]. Magazine hand cameras for roll films ; focusing and finding arrangements ; shutters with pivoting blades. - In a camera designed to take single pictures on kinematograph film-stock, wherein the film is advanced after each exposure by operating a slide, located in the camera back, and carrying pins designed to enter the film feedperforations, (1) the slide is actuated by a handle passing through a slot in the camera back, and a slidable, light-excluding plate is provided between the slide and the slot; and (2) a film receiving holder is provided having attached thereto a plate for maintaining the film flat in the exposure position,. and a plate for guiding the film into the holder. A counting mechanism is actuated by the handle of the feed-slide is referred to. In the form shown in Fig. 1, the camera body 1 is closed at the rear by a cover 14 having a slot 70, through which extends a handle 22 fixed to a plate 15, which is slidable horizontally in guides 16 and carries a pivoted feed member 18, which is urged towards the film 13 by a spring 18<1> and carries .at its free end a yoke provided with bevelled pins 17<1> which engage the film feed perforations and advance the film when the handle 22 is moved to the right. A slidable cover plate 21 prevents ingress of light. The film 13 is drawn from a casing 32 and received in a casing 33 which is closed by a cover 63<1> carrying a guide-plate 63 extending across the focal plane, and serving to hold the film against the supporting-frame 6. The cover 63<1> also carries a spiral spring 66 serving to guide the film after its entry into the casing 33 through a light-tight guideway formed by the plate 63 and a plate 71. The Specification as open to inspection under Sect. 91 (3) (a) also describes :-(1) A counting- mechanism, mounted in a casing 23, Fig. 4, (Cancelled) on the end of the cover 14, and comprising a toothed wheel 24 which is advanced at the end of each feed movement of the slide 15 by the engagement of the handle 22 with a spring 27 carrying a pawl 27'. The wheel 24 is held by a locking-pawl 29, and carries a pointer 31 moving over an external scale. (2) Focusing mechanism, comprising a frame 6, Fig. 1, which supports the film in its passage across the focal plane and is slidably mounted in guides 11 parallel to the axis of the objective, wherealong it is displaced as by an eccentric 8, or by rack- and-pinion or crank gearing co-operating with an external focusing-scale. (3) A finder frame slidably mounted in vertical slots 58, Fig. 1, in the front wall of the camera body, and carrying stops for arresting the frame when withdrawn into operative position. (4) A shutter mechanism which, together with the objective 40, is mounted on two members 34, 39, Fig. 1, secured to the front wall of the camera, and comprises (a) a tensioning-lever 41, Fig. 10 (Cancelled), turning about the optic axis, and provided with arms 41<1>, 41" and a setting handle 54 moving over an external scale ; (b) an intermediate lever 43 pivoted at 50 and connected to the arm 41<1> of the lever 41 by a spring 42 ; (c) a lever 45 pivoted at 50<1>, which carries a pin 46 engaging slots 47 in two shutter blades 37, Fig. 14 (Cancelled), pivoted at 38 to the member 39, and is connected by a spring 44 to the arm 41<11> of the lever 41; and (d) a trigger 48 pivoted at 50<11> and having a toe which is normally pressed by a spring 49 into a notch in the lever 43. When the tension of the springs 42, 44 has been adjusted for a desired rapid exposure by setting the handle 54, depression of the trigger 48 rotates the lever 43 clockwise, causing the toe 43<1> of this lever to slide over the pin 46. The toe of the trigger 48 then slips out of the notch in the lever 43, whereafter this lever is turned back bv the spring 42, causing the toe 43<1> to depress the pin 46 and open the shutter blades. When the toe 43<1> has passed the pin 46, this pin is returned by the action of the spring 44 on the lever 45, and the shutter blades are c losed. For a time exposure, the handle 54 is moved fully to the left, and, on depressing the trigger 48, the. lever 43 is rotated clockwise and prevented from fully returning by the engagement of a catch 43<11> thereon with an arm 74 on the lever 41, the lever 43 being thereby arrested at the instant that the shutter blades have been opened. When the trigger 48 is released to terminate the exposure, it is returned to its normal position by the spring 49, and the toe of the trigger slips under the adjacent end of the lever 43 and lifts it so that the catch 43" is disengaged from the arm 74. The lever 43 then returns fully under the action of the spring 42, and the blades are closed as before. A diaphragm plate having three apertures is mounted to rotate in front of the shutter blades on a pin, which carries a pointer moving over an external scale. This subject-matter does not appear in the Specification as accepted..