Patent GB-225115-A (GB)
Title: Improvements in or relating to cinematograph apparatus
IPC: G03B19/18
Filed: 1924-04-07
Abstract: 225,115. Wade, H., (Mills Novelty Co.). April 7, 1924. Kinematograph apparatus.- Apparatus for producing or projecting spirally arranged images on a rotating disc film comprises means for moving the lens across the disc and for oscillating the lens so that it has a limited movement with the disc; the angular speed of the disc may be controlled by governor means so that the images travel past the lens at a constant linear speed. The apparatus comprises a flat box 15, Fig. 2, for the reception of a holder containing the film disc, and a casing 20 mounted thereon and containing the mechanism. Figs. 3, 4, and 5 show respectively vertical sections at right angles to one another and a horizontal section of the casing 20, and Fig. 8 shows a section on the line 8-8, Fig. 3, of the lens mount &c. A spring motor in a barrel 21a, Fig. 5, drives a shaft carrying toothed wheels 25, 26, the wheel 25 being geared both to a wheel 30 on a shaft 31, whereby the film disc 43 is rotated, and also to a governor 36<a>, Fig. 3. Means whereby the shaft 31 may be clutched to the disc is described. The holder 44 containing the disc has a radial slot 52 to receive, the clutching means and permit exposure of the images, and a corresponding slot is formed in the casing 20, this slot being covered by a steel curtain 69 secured to rollers 70. A bar 67 is secured to the curtain 69 and a rack 76, engaging the wheel 26, is pivoted to the bar 67 so that the curtain and the lens 53, Fig. 8, carried thereby are moved across the disc while it is being rotated. The cell 54 of the lens 53 is secured to an arm 59 which is connected by a link 58 to an arm 56 pivoted on a standard 64 secured to the bar 67. A spring 62 connects the lower end of the arm 59 to the arm 56, and a spring 66 connects the arm 56 to an arm 65 on the standard 64. The film disc 43 has a spiral groove with a projection therein for each image, as described in Specification 182,197; a roller 57 on the arm 56 engages the groove, and a finger 60 on the arm 59 successively engages the projections in the groove so that the lens is moved with the disc until separation of the finger and projection is caused bv movement of the curved end of the arm 59 between pins 61 on the arm 56. The arrangement may be such that the lens is moved slightly towards the film, and also tilted, so as to compensate for movement of the film disc. The lens cell is connected to the curtain 69 by a bellows 73 secured around an opening therein, and a shutter is mounted within the bellows. The shutter comprises a curved plate having an, aperture 81 and a weight 80, and is mounted on an arm 79 pivoted on a tongue 78 projecting from the lens cell. When the lens cell is still, the aperture 81 is kept out of register with an opening in a curved plate 77 by a spring engaging the tongue 78 and arm 79, but the vibration of the cell produced by the film disc causes the shutter to vibrate across the aperture, the shutter moving in one direction owing to its inertia and in the other direction under the action of the spring. The lens cell may be pulled away from the film disc by means of a cord 98<a> passing through a lug 98. The angular speed of the disc is controlled by a cam surface 81<a>, Fig. 3, on the back of the rack 76, the cam causing the depression of an arm 82 pivoted at 83 so that a pin 85 thereon moves a lever 86 engaging the governor disc 37. A lever 89 enables the motor to be stopped, and a lever 92 enables the rack 76 to be disengaged from the wheel 26. When the apparatus is to be used for projection, the back of the box 15 is opened and turned horizontally to serve as a base; a yoke carrying a lamp house and condenser is then mounted so that it may travel on rollers along the top of the box 15, and is connected to the lug 98, Fig. 8, so as to move with the lens.