Patent GB-198994-A (GB)
Title: Improvements in motion picture projection apparatus
IPC: G03B21/50
Filed: 1923-03-21
Abstract: 198,994. PathÚ Cinema, Anciens Etablissements PathÚ FrÞres. June 12, 1922, [Convention date]. Addition to 175,968. Kinematograph apparatus.-In a projector having means for bringing the film to rest, as described in the parent Specification, means are provided for automatically restarting the feed of the film after a predetermined time. The film is fed by claws 12 which are projected into and withdrawn from the film perforations by a cam 13, and are moved vertically by a cam 9 rotating in a vertically-movable frame 10. The cam 13 is secured to a sleeve 17 rotating with and slidable on the shaft 14 carrying the cam 9, and the shaft 14 is rotated through a worm 23 and worm wheel 24 by the driving handle 26. A roller 19 engaging the edge of the film is carried by a sliding arm 74 connected to a pawl 72 pivoted at 73. A lever 67, pivoted at 66 and pulled by a spring 70 towards a stop 71, is connected to the sleeve 17 and has a projection 69 which is engaged by the pawl 72 while the film is being fed. When, as shown, the roller 19 enters a notch 75 in the edge of the film, the pawl 72 becomes disengaged from the stop 69 and allows the spring 70 to pull the lever 67 and the sleeve 17 into a position such that the claws 12 do not enter the film perforations,- the feeding of the film being thus stopped. The means for rendering the claws again operative comprises, as shown in Fig. 1, a barrel 64 loosely mounted on the shaft 26<a> of the handle 26 and connected to it by a spring 61. The drum is provided with a stud 65 which, when the roller 19 &c. are in the position shown, engages a nose 68 on a second arm of the lever 67. Continued rotation of the handle 26 ineffectively operates the feeding mechanism until the spring 61 has been wound tight. The drum 64 then rotates, and the stud 65, by its pressure on the nose 68, rotates the lever 67 and moves the claws 12 into operative position. The notch 75 is consequently fed past the roller 19, and the stop 69 becomes engaged by the pawl 72 so that the feed mechanism continues operative until the roller 19 enters the next notch 75. The Specification as open to inspection under Sect. 91 (3) (a) comprises also the modification shown in Fig. 3 (Cancelled). A lug 77 is provided on the lever 67, and the shaft 26<a> carries a screw 78 and a disc 79 having a stud 80. A shaft 81 parallel to the shaft 26<a> has a cam 82 secured to it and carries a sleeve 83 having an arm 84, the sleeve being pressed from the cam 82 by a spring 85. In this modification, movement of the lever 67 consequent upon the entry of the roller 19 into a notch 75 causes the lug 77 to engage the cam 82 and turn the arm 84 into engagement with the screw 78. Continued rotation of the handle- 26 then causes the screw to move the arm 84 until it engages the stud 80 and is rotated thereby. The cam 82 then engages the lug 77 to move the lever 67 and claws 12 so that feeding recommences, and the spring 85 forces the arm 84 back to its original position. When it is desired to exhibit a picture or title for a longer period than the mechanism permits, the picture &c. may be repeated one or more times on the film, corresponding notches 75 being provided. This subject-matter does not appear in the Specification as accepted.