Patent GB-713068-A (GB)
Title: Improvements in and relating to photographic roll film cameras
IPC: G03B19/04
Filed: 1950-08-09
Abstract: 713,068. Photographic cameras. HEIDECKE, R., [trading as FRANKE & HEIDECKE]. Aug. 9, 1950 [March 14, 1949; May 6, 1949], No. 19816/50. Classes 97(1) and 98(1) In a photographic apparatus which comprises a photographic reflex camera arranged above another roll-film camera in a single housing and a single drive device provided with change over means for selectively coupling said device to the film feed mechanism of either camera, each camera has a separate shutter release device, a locking device for the film feed mechanism, a first means co-operating with the shutter release device and connected to the locking device to prevent both advance of the film before exposure and reexposure of an exposed film frame, and a second means co-operating with the shutter release device and connected to the drive change over means so as, when the drive device is coupled to said film feed mechanism and after actuation of the shutter release device, to prevent disconnection of the drive device from the film feed mechanism until the film has been advanced to the next exposure position. As shown in Fig. 1 the single drive device comprises a crank 1 coupled to a pinion 3 to which is attached a ratchet 14 mounted on the change-over means which consists of a lever 6, pivoted at 7 and operable by a handle 34 to engage the pinion 3 with a pinion 4 in the reflex camera or a pinion 8 in the lower camera. The pinions 4 and 8 are geared to pinions 5 and 9 connected to the take-up spools in the respective cameras so that rotation of the crank can effect movement of the film in one or the other camera. The film in each camera passes over a roller 10 or 10<SP>1</SP> to drive a gear 12 or 12<SP>1</SP> to which is attached an exposure counter and a disc 13 or 13<SP>1</SP> having a notched periphery, movement of each film through one frame causing rotation of the disc 13 or 13<SP>1</SP> through one tooth pitch. During such rotation a tooth 16 or 16<SP>1</SP> on a member 15 or 15<SP>1</SP> having pin and slot connections as at 23, 25 with a fixed part of the apparatus, spring urged at 27 or 27<SP>1</SP> and coupled with a slide 20 or 20<SP>1</SP>, rides on the periphery of the disc 13 or 13<SP>1</SP> and, when the film has moved through one frame, this tooth snaps into a notch of the disc at the same time as a tooth 17 or 17<SP>1</SP> on the member 15 or 15<SP>1</SP> engages the ratchet 14 to prevent further film movement. Fig. 1, shows the member 15 of the reflex camera in this position, the shutter release button 18 being in position ready to effect an exposure. This button has a sloping surface 22 and notches 29, 24, the notch 24 lying within an aperture 32 in a slide 31 which is connected to the lever 6 and through which and the slide 20 the button 18 passes. An exposure is effected by depressing the button 18. Movement of this button causes the slide 20 to rise carrying with it the member 15 so that the ratchet 14 is freed and the tooth 16 of the member 15 moves out of a notch to engage the periphery of the disc 13. At the end of the exposure movement of this button, the slide 20 engages behind the notch 29 and so prevents return movement of the button under the action of a spring (not shown). The film in the reflex camera is now wound on and when it has travelled through one film frame, the tooth 16 snaps into the next notch portion of disc 13 under the action of spring 27. This action causes the slide 20 to move downwardly whereupon the tooth 17 engages the ratchet 14 to prevent further film movement and the button 18 is returned to its rest position. When the reflex camera is being used, the tooth 17<SP>1</SP> is out of engagement with ratchet 14 and the shutter release button 18<SP>1</SP> is prevented from a shutter release movement by the engagement of the notch 24<SP>1</SP> therein with the slide 31'. If now it is desired to use the lower camera, the lever 6 is operated so that ratchet 14 is freed from the tooth 17 and engages the tooth 17<SP>1</SP> of the member 15<SP>1</SP>. At the same time, the slides 31, 31' move downwardly so that the notch 24 in the button 18 engages the slide 31 at 32 and retains the button 18 in its rest position and the slide 31<SP>1</SP> frees the button 18<SP>1</SP>. In another form, Fig. 4, each shutter release button has a sloping surface 24<SP>11</SP> as well as a sloping surface 22", these surfaces cooperating respectively with slides 20<SP>11</SP>, 31<SP>11</SP> so that the gear 3 is caused to move into engagement with the gear 4 or 8 when the appropriate button 18 or 18<SP>1</SP> is depressed to make an exposure. The lenses 42, 43, Fig. 8, of the two cameras are provided with diaphragm adjusting pinions 45, 46 which mesh with pinions 47, 48 respectively. These pinions are mounted on an axle 49, Fig. 10, the pinion 48 which carries a scale of film sensitivities being freely rotatable on this axle and the pinion 47 being splined thereto. Also freely movable on the axle 49 is a disc 50 bearing a scale of film sensitivities and having a projection 56 for drivingly engaging any one of several recesses in the pinion 48 and having several recesses 55 for engagement by a projection 54 on a knob 52 pinned to the axle 49, a weak spring 62 being interposed between the scale disc 50 and the knob 52. Normally, a spring 61 holds the knob in engagement with the disc 50 and the latter in engagement with the pinion 48 so that the pinions 47, 48 and thus the pinions 45, 46 may be rotated together and the diaphragms of the two lenses simultaneously adjusted. If, however, one camera has a film therein of different sensitivity from that in the other camera, then the knob 52 is raised and then together with scale disc 50, is rotated the necessary amount as determined from the scales on disc 50 and pinion 48 to adjust the diaphragm of the reflex camera only. Another arrangement is described, Figs. 13-15, (not shown) where a collar on the axle 49 has a pin for engagement with recesses on disc 50 and a spring is interposed between the disc and the knob 52. Scale disc 50 also carries a scale of filter factors and knob 52 has thereon a mark so that when a filter is attached to one camera, the knob is uncoupled from pinion 48 and from the scale disc 50 and rotated until the mark registers with the appropriate division on the filter factor scale. This adjustment may be effected automatically by providing the knob 52 with a gear and the filter mount with a bayonet coupling and a toothed segment which, on mounting the filter, rotates the knob through the necessary amount. A projection 63 or 65 on the diaphragm adjusting pinions 45, 46 is adapted to engage a notch 64 or 66 in the shutter release knob 18 or 18<SP>1</SP> when the maximum diaphragm aperture has been reached.