Motography (Apr-Dec 1911)

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May, 1911. MOTOGRAPHY 81 The operation of this locking device is as follows : Just as the pin 17 enters the star wheel jj, the cam ip releases the arm 23 and the locking arm 22 moves back from the star wheel and releases it to be moved by the pin. Then as the pin leaves the star wheel, the cam 19 pushes the arm 23 down, bringing the arm 22 back against the next flat face of the star wheel and locking the star wheel and the intermittent sprocket without the use of the pin wheel as a locking means. /a Because the pin wheel does not have the duty of locking the star wheel with the usual locking cam, the adjustment between the two parts may be very lax, and a very large degree of wear may be permitted without causing the jiggling of the picture upon the screen which results when the Geneva does not lock closely. No. 983,073. Shutter Mechanism for Kinetoscope. Arcade Mallet, Paris, France. The improved shutter device shown and claimed in the patent is particularly adapted for that class of kinetoscopes in which framing is accomplished by 983,073. moving on vertical slides a framing carriage supporting the objective lens and the film window. In this type of kinetoscope, the framing is done by moving the film window to the picture image of the film, not by moving the film or sprockets in any manner to bring the image to the film window. With the sliding film window and sliding lens as a means of framing (or "centering" the picture, as M. Mallet describes the action), a proper provision of shutter device must be made to serve the lens properly in its varying position upon the motion head. The shutter problem is the problem which M. Mallet has solved. The full descriptive text of his patent reads as follows : My invention will be readily understood by referring to the accompanying drawings, wherein — Figure 1 .is a side view partly in elevation and partly in section. Figure 2 is a view in front elevation. It is well known that in an apparatus of this kind, the objective 1 of the projector must be displaced vertically and horizontally for which purpose, said projector is mounted on a sliding part 2 suitably actuated by mears of the pinion 5 meshing with the rack 6, which is secured to the sliding part 2. In carrying out the objects of this invention, a disk 4 adapted to rotate at a speed corresponding to that at which the film unrolls is interposed between the film and the screen upon which the image is to be projected. As is well known, the film is moved with an intermittent or irregular movement, that is to say very rapid for passing from one view to another, with a slight pause as each view passes in front of the objective. According to the present invention, the image is centered 983,073. on the screen without changing the position of disk 4 in respect to the screen. Referring more particularly to the drawing, a guide o is rigidly secured to the plate 2 which bears the objective 1 while at the outer end of said "guide 9, depends a bracket 20 in which a pintle 13 is rotatably mounted. Fastened to said pintle 13 is the disk 4 which is thus rotatably mounted between the objective and the screen while it is at the same time subject to the horizontal and vertical adjustments of the objective. To operatively connect the disk 4 with the governing shaft 16, an extensible exible coupling such as that which is now to be described, is made use of. The pintle 13 is attached by a Cardan joint 14 to a member 12 sliding upon another member 10 whose extremity is keyed to a part 21 which by means of another Cardan joint _ 15 is connected to the governing shaft 16 which is in turn driven by the gears 17 and 18. It will thus be seen that the objective / can be displaced in the manner required for centering the projection while at the same time a constant relation between the objective 1 and the rotary shutter or disk 4 is maintained.