Patent GB-242697-A (GB)
Title: Improvement in motion picture camera
IPC: G03B19/18
Filed: 1924-08-11
Abstract: 242,697. Howell, A. S. Aug. 11, 1924. Kinematograph apparatus. - In a camera comprising a frame which is removable through one side of the casing, the frame carries a power spring device and a gear train driven thereby; the spools and the mounts therefor may be secured to the frame, and the casing may be provided with a detachable front carrying the intermittent feed mechanism and the shutter. The casing 1 has an open side provided with a removable cover 7, a cylindrical portion 2 formed on the, closed side, and a cylindrical portion 4 at the front having a detachable front 5 screwed thereto. A frame comprising spaced parallel plates 12. 13 is secured bv screws within the casing, and carries a power spring 46, continuous feed-sprockets 32, the back part 78 of the gate, the spools 18, and transmission mechanism. The spring 46 is secured at its inner end to a flange 45 formed on a hollow spindle 41 capable of being engaged by a detachable winding key, and is secured at its outer end to the frame. The spindle 41 is carried by the frame, projects through the casing, and is surrounded by a hub member 39. A spring 48 forms a one-way driving connection between the flange 45 and the member 39, and the member 39 carries a gear wheel 55 operating through wheels 56, 58, 38, 36 to drive the sprockets 32, the sprockets being formed with gear wheels 34 at their ends. A crown wheel 37 on the shaft of the wheels 38, 36 engages a wheel 97 carried by the detachable front 5 and formed in one with a cam member 82 operating the intermittent feed mechanism and carrying a rotary shutter 98. The wheel 58 also drives the take-up spool through wheels 152, 161 and frictional connection to the spindle 17<1>, and the cam member 82 drives a governor 103 through multiplying gearing and a frictional connection. Means are described for varying the speed at which the governor is operative and for manually releasing the mechanism. The film is fed intermittently by teeth 94, Fig. 8, carried by an arm 93 extending from a shuttle plate 88 mounted so as to be reciprocated on fixed studs 85 by a cam 84 carried by the member 82. The plate 88 has projections 92 engaging a face cam on the member 82 so as to cause the teeth 94 to engage the film perforations during movement of the shuttle in a downward direction. The detachable front 5 also carries the front part 66 of the gate which is provided with a fixed guide 68 for one film edge and a spring-pressed guide 73 for the other film edge. The back part of the gate 78, Fig. 5, is mounted on a member 136, a coiled spring 139 being interposed between them. The member 136 forms the front end of a bar 131 capable of forward and rearward movement. The bar 131 also carries a roller 147 and pins 148 engaging opposite sides of cam members 146 on arms 145 secured to guides 144, the guides being mounted on pivots 143 and serving to retain the film on the sprockets 32. As shown the bar 131 is in its rearmost position so as to enable the film to be threaded; after threading it is moved forward to close the gate, and during the movement the guides 144 are caused to close on to the sprockets 32. Backward rotation of the spindle 17<1> of the take-up spool is prevented by a locking plate 167, Fig. 5, mounted on a pivot 168, and having an eccentric surface 169 kept in engagement with the spindle 17<1> by a spring 171. A view-finding tube 163 having apertures 165 and lenses 166 is provided on the movable cover 7, and an external film-feed indicator 153 is mounted on the casing 1, being rotated by ratchet bars 161, Fig. 6, engaging a ratchet wheel 156 and operated by an eccentric 159 on the spindle 157 of a wheel 158 meshing with the wheel 55.