Patent GB-191228917-A (GB)
Title: Improvements in Cinematograph Apparatus.
Inventor: ANDERSON WALTER HILLIER
IPC: G03B21/32
Filed: 1912-12-16
Granted: 1913-08-28
Abstract: 28,917. Anderson, W. H. July 22, [Convention date]. Kinematograph apparatus.-Comprises several detail improvements in kinematograph apparatus. The shutter 46, Figs. 6, 7, and 9, is cylindrical with apertures 51, 52 and is enclosed in a casing 47 having a cap 49. A slide carrying the holder 67 for the objective can be moved for focusing purposes along a groove 70 in the cap 49 by means of a screw 72 engaging the lug 71, the screw being turned by the knobs 74, 75. Slidably mounted on the casing 47 is a slide 86 carrying brackets 83, 84, to which the film-gate 3 is pivoted. The gate carries wires 89, 90 the ends of which are bent round to pass through the gate a n d h a v e secured to them heads 95, 96 upon which bear flat springs 91, 92 fastened at their centres to the gate by screws 93, 94. When the slide 86 is moved in to close the gate, the bars 89, 90 enter the recess 98 and press on the film. The gate is kept closed by slides 100, 101, slidable over screws 103 and having catches 104, 105 to engage lugs 106, 107 on the gate. The slides are moved by turning the button 108. The filmcentring device shown in Figs. 11 and 12 comprises a lever 135, the arm 142 of which is connected by the link 141 to a frame 153 which can rotate about the axle 19 of the driving- wheel 18 and in which is mounted the ordinary Maltese-cross feed, the pinion 151 being driven from the wheel 18 through an idle wheel 152. The spindle 156 of the wheel 152 is fixed to a slide 155 which can move in a slot 157 in a transverse casing 154 on the frame 153. The slide 155 is connected by a link 160, and the frame 153 by a link 158 to a lever 161 pivoted at 162. With this arrangement the result of depressing the lever 135 is, owing to the action of the idle wheel 152, that the feeding-sprocket is raised without being rotated so that the synchronism between the feeding-mechanism and the shutter is not disturbed. A device for preventing the film from becoming ignited when broken comprises a roller 204, Fig. 12, at the end of one arm of a bell-crank lever 201 pivoted at 207. The roller falls when the film breaks and brings the points 202, 203 into contact to complete the circuit of an electro-magnet which pulls over a switch in the circuit of the driving- motor and stops the apparatus. To stop the apparatus at the end of a series of pictures and then re - start it, the film is passed between terminals 190, 191, Fig. 2, and is provided at the desired parts with conductors 220, Fig. 16, which make contact between the terminals and complete the circuit of the electro-magnet referred to above. The re-starting of the apparatus is delayed by attaching the core of the electro-magnet to the piston of a dash-pot. To prevent the pictures from being shown when the speed is insufficient, the shaft 13, Fig. 20, carrying the pulley 12 driven by the motor has fixed to it a disk 230 which has arms 232 pivoted at 233 and provided at their outer ends with friction pads 234. These arms enter a cylinder 235 loosely mounted on the shaft 13 and separated by the insulating-disk 236 from a boss 237 made of insulating-material and provided with a stop 240 and terminal block 241. A block 243 is secured to and overlaps the edge of the cylinder 235 and makes contact with the block 241 when the cylinder is at rest. This contact completes the circuit of an electro-magnet which actuates the shutter 114, Figs. 6 and 7, to cut off the light. When the speed is sufficient the arms 232 fly out and rotate the cylinder 235. This breaks the circuit of the electro-magnet and the shutter is then rotated out of the path of the light under the action of a counterweight.