In the District Court of the United States, for the Eastern District of Pennsylvania, the United States of America, petitioner, vs. Motion Picture Patents Company, et al., defendants (1914)

629 C83 projects through the frame-plate and upon the rear side thereof carries an arm 31, which is directly over the shaft 4. Upon the shaft 4 is an eooentrio 32. and the eccentric-strap 5 33 is connected to tie arm 31 by an ecoentricrod 34, having a hinged connection with the eccen trio-strap and a universal-joint connection with the arm 31. When the shaft 4 revolves, the rock-shaft 30 is caused to vibrate. io The amplitude of this vibration is sufficient to cause the pin 20 to engage with the outer edge of the slot 28 each time and lift the spring 27 clear of the film and hold it so during the time the shutter of the eamera is if closed. 35 is the shutter-disk, by which the admission of light to the film is controlled. It is a thin disk mounted upon and secured to the driving-shaft 4 and situated just in rear of ao the lens. A portion of its periphery is cut away, so as to leave the lens uncovered during a portion of the revolution of the disk, and thus to permit the passage of light to the film. When the different views or prints 25 made from the negative strip produced by this camera are to be mounted separately, as in the exhibition device shown and described in my above-mentioned patent, No. 549,309, it is necessary that some means shall be used 30 for marking the position of each view on the , strip or film accurately, so that tjie views of the prints made from the strip maybe registered accurately when subsequently mounted separately. The marking of the film for this 33 purpose I effect by punching two holes in the film each time a new length of film is fed forward. Upon the rock-shaft 30, upon either side of the pin 29, is mounted an arm 36, carrying a punch 37, which is arranged to punch 40 a hole through the film each time the shaft 30 vibrates. The plate 2& is perforated to permit the punchings to escape. The holes thus punched are punched each time at the instant when the exposure is made and are al 45 ways in precisely ihe same position with respect to the center of the view. In printing from the negative strip made in the camera after the pictures thereon have been developed a sensitized strip upon which the posi 50 tives are to be printed is first run through the camera or through a similar punching mechanism, so as to have the holes punched at the same distance. as are the holes in tho negative strip. When the positive and nega 55 tive strips Are placed in the printing-frame for pointing, the registration-holes are kept in registry while printing is going on by means of dowels -or similar devices. In preparing the camera for operation a 60 strip of film is first placed in position by opening the side of the case 1, which exposes to view the median ism, placing a spool of film ou the spindle 7, and carrying the end of tho film lietween the drum 14 and roller 19, over 65 the plate S3 and under the catch 27, between the auxiliary feed-rolls 24 and 25, between the drum 14 and roller 20, and to the wind ing-spool 9, to which it is secured. Tho side of the case 1 is then closed, a loop being left between rollers 24 and 25 and rollers 14 and 70 20, and the camera is in readiness for operation. In the drawings the parts of the mechanism are shown in the position occupied when the shutter is open and the exposure half com 75 pleted. The spring or stop 27 is holding the film stationary against the top of the backing-plate 23. The drum 14 is rotating in the direction of the arrow shown in Fig. 1, drawing film from the spool 6, which collects in a 80 loop between the drum and the plate 23, since the film is not being fed forward across the plate 23. A loop of exposed film, which has previously been formed, as will be seen hereinafter, between the auxiliary feed-rolls 24 85 and 25 and the drum 14, is being taken up through the feeding forward of the film by the drum 14 and roller 20, and the film thus fed forward is wound upon the rotating spool 9. As the shaft 4 rotates the edge of the shut 90 ter-disk 35 cuts off light, from the lens. At the instant light is' out off the pin.29, moving upward, lifts the spring 27, thus releasing the film. The auxiliary feed-rolls 24 and 25 during the time that the. shutter is open simply 95 slip over the film, bat are unable to feed it forward, because1 it is held by the spring 27; but when this spring has released the film the rolls 24 and 25 instantly feed.it forward. These rolls move at twice the peripheral speed 100 of the drum 14, as above stated. Therefore during the time the light is cut off they feed as much film across the plate 23 as has been fed into the loop between the drum 14 and plate 23 during a complete revolution of the 105 shutter. The loop of film between the drum 14 and plate 23 is taken up, therefore, during the time that the shutter is closed, the extra film in -this loop corresponding to the length of film required for a new exposure. At the no same time another and corresponding loop is formed between the auxiliary feed-rolls 24 and 25 and the drum 14, since the film is fed onward much faster by the rolls 24 and 25 than it is taken up by the drum 14 and roll 115 20. Further rotation of the shaft 4 causes tbe shutter to open. Just before the shutter is the spring 27, which has been descending . iih the pin 29, touches the film and holds it stationary against the plate 23. The aux 120 iliary feed-rolls, being no longer able to move the film, slip over its surface. As soon as tho shutter opens exposure begins and continues so long as the shutter is open — that is, during about half the revolution of the shutter-disk. 125 The rock-shaft 30 still continues to. move after the spring 27 has reached the film on the plat* 23, and by its further movement causes the punches 37 to punch holes through the film, as above explained. These punches are 130 withdrawn by the backward movement of the rock-shaft 30 before the pin 29 lifts the spring 27 and releases the film. It will bo noted that all of the parts of the