Patent GB-678475-A (GB)
Title: Improvements in photographic type composing machines
IPC: B41B15/08
Filed: 1950-05-23
Abstract: 678,475. Photographic type - composing machines. INTERTYPE, Ltd. May 23, 1950 [May 23, 1949], No. 12869/50. Class 98 (i). A photographic type-composing machine of the kind wherein lines of type matter are produced, letter by letter, on light-sensitized film or paper from composed lines of elements each bearing a photographic type character, the elements being presented individually and successively at a photographing position, the sensitized medium being supported in a holder moved stepwise from a line-starting position past the optical axis of the photographing lens in order to space the successive variant width character images in proper setwise relation, the sensitized medium being advanced upon completion of each line in order to line-space the successive lines, and the optical system including a shutter for preventing the passage of light along the optical axis except when an element is in position for photographing, comprises a manually settable device for preventing photographing of the line of elements which includes a shutter movable from a normal position away from the optical axis to a blank-out position across the axis, and a manually-operated element mechanically connected to the shutter and movable from a normal inactive position to an active position to cause the shutter to move across the axis. The machine may also be provided with shutter reset mechanism conditioned for operation by movement of the manually-operated element from normal to active position and operable in timed relation to the passage of the last element of a composed line through the photographing position to restore the manually-operated element and shutter to their normal positions, with line counting mechanism actuated each time that a line of characters is photographed to record the number of lines produced, and counter-inactivating mechanism mechanically associated with the line-counting mechanism and with the manually operated element of the blank-out device to hold the line-counting mechanism inoperative when the manually-operated element is moved into its active position. The machine is similar to that described in Specification 650,630. As shown in Fig. 9, depression of the knob 296a projecting from the camera housing raises the blank-out shutter 301 to a position across the optical axis and prevents photographing of the line of composed elements. The shaft 297 of the blank-out lever 296 carries a bell-crank lever 302 whose forked end embraces a pin 303 extending from an L-shaped slide 304. Depression of the knob 296a raises the slide 304 and accordingly the rod 306, thus rotating the lever 309 clockwise against the action of the spring 311 to prevent clockwise rotation of the lever 65b (by engagement of the lip 65c thereon with the tip 309a of the lever 309) pinned to the rock-shaft 61 carrying the lever 60 which operates the film-advancing bar 57 for effecting line-spacing, a yielding coupling being provided in the rod connecting the cam-engaging lever with the lever 60. The pawl 317 on the other end 302b of lever 302 carries at one end a pin 318 contacting a cam surface 304a on the slide 304 and at the other end a pin 320 which, when the knob 296a is pushed down, rests on the top edge of the pawl driving arm 315 carried on a sleeve freely rotatable on the shaft 297. A second sleeve also freely rotatable on the shaft 297 carries a double-ended lever 312 normally urged counterclockwise by the spring 312c. The lever 312 is normally held in the position shown by contact of the surface 312b with the slide 304, and the other end is held by engagement with a bracket connected to the rack controlling the movement of the film-holder for letter-spacing. When the slide 304 is raised, and the rack descends for letterspacing, the lever 312 is free to swing turn counterclockwise, and the pawl-driving arm 315 turns to permit the pin 320 to enter the notch 315a therein. On restoration of the rack to its starting position, the lever 312 is swung back and the pawl-driving arm 315 causes the pawl 317 to drive the lever 302 clockwise and thus rock the shaft 297 and move the blank-out lever 296 towards its inoperative position. The lowering of the slide 304 causes the surface 304a to engage the pin 318 on the pawl 317 to rock the pawl clockwise and disconnect the drive between the arm 312 and the shaft 297 before the parts have been restored to their inoperative positions. When the lever 296 is in its fully operative position, the roller 328 engages the surface 327b on the cam 327 to hold the parts in that position, but as the shaft 297 is turned by the pawl 317, the roller 328 rides on to the surface 327a which is so sloped that the push of the roller 328 rotates the shaft 297 to complete the movement of the lever 296 to its fully inoperative position. Movement of the lever 60 to operate the film-advancing slide 57 is prevented by the levers 65b and 309 being locked together, this locking being broken during the passage of a succeeding line of elements when the cam-follower-roller on the cam-engaging lever drops into a depression on the controlling cam for the lever system. The lever 296 is held in its depressed operative position when it is desired to pass successive composed lines of elements through the machine without photographing by pushing in a slide 321 which carries a rack 322 meshing with a pinion 323 on a shaft 324 having a part 326 which, when the slide 321 is pushed in, blocks counterclockwise turning of the arm 315 to prevent the pin 320 from entering the notch 315a. Accordingly, the restoration of the letter-spacing rack to its uppermost position at the end of a line does not turn the shaft 297 and hence the lever 296 is not returned to its inoperative position. Manual raising of the lever 296 causes a pin 296b thereon to engage and turn a cam 325 on the shaft 324 to push out the slide 321 to its inoperative position. The rod 24, Fig. 18, which is depressed to allow passage of a composed line of elements through the photographing position, carries a collar 24a on which rests one end of a lever 335 urged for clockwise movement by the spring 334. The other end of the lever 335 carries a pin 335a engaging a pin 332a on the operating arm 332 of a counter 331, and accordingly each depression of the release rod 24 actuates the counter. When the blank-out lever 296 is depressed, the pin 296b urges the lever 336 clockwise against the spring 338 to cause the hook 336a to lock over the pin 339 on the lever 335 to prevent movement of the lever 335 and actuation of the counter. When the camera housing unit is swung away from its operative position, the end of the lever 335 leaves the collar 24a, but clockwise rocking of the lever 335 to effect counting is prevented by the notched end 340a of the lever 340 engaging the pin 335a, such movement of the lever 340 by the spring 342 being permitted by the movement of the collar 105a on the locking bolt 104 when, on opening the camera housing, the bolt moves to the right under the action of spring 109 to engage the flattened portion of collar 105a with the flattened portion 108 of the collar 107 on the shaft 40 and thus prevent descent of the film holder. Specifications 590,553 and 615,559 also are referred to.