Патент USA US2406595код для вставки
Aug“. '27, 1946. 2,406,595 C. W. DYER SPROCKET DRIVE FOR MOTION PICTURE PROJECTORS Filed March 14, 1945 aWDyer Patented Aug. 27, 1946 2,406,595 UNITED STATES PATENT OFFICE‘ 2,406,595 SPROCKET DRIVE FOR MOTION-PICTURE PROJECTORS Charles W. Dyer, Stratton, Maine Application March 14, 1945, Serial No. 582,695 3 Claims. 1 The present invention relates to motion pic (Cl. 88—18.3) 2 disks will be adjacent the groove or valley [4 ture projectors and more particularly to a of the other of the disks, as will be apparent from sprocket drive mechanism for feeding the ?lm an inspection of Figures 1 and 3 of the drawing. through the projector. A driven disk I5 is secured to the shaft 1 with An object of the invention is to provide a 5 its edge projecting between the disks l0 and II. sprocket drive mechanism of this character Pegs I 6 and I7 project from opposite sides of adapted particularly for use with motion picture the disk [5 adapted to ride on the peripheral projectors of either 8 or 16 mm. ?lm and adapt edges of the disks [0 and H. The pegs l6 and ed to maintain a loop in the ?lm of desired size 11 are staggered with respect to each other to .to prevent cracking or breaking of the ?lm dur 10 space the same from each other circumferen ing the feeding thereof through the projector. tially of the disk [5 and the pegs are spaced A further Object of the invention is to provide from each other at the opposite sides of the disk a sprocket drive mechanism of this character [5 a proper distance so that when one of the of simple and practical construction, .which is cam humps I3 engages the peg A, as indicated ef?cient and reliable in operation, relatively in 15 in Figure l of the drawing, the disk l5 will be expensive to manufacture, and otherwise well moved in a direction as shown by the arrows so adapted for the purposes for which the same is that the peg B at the opposite of the disk l5, intended. will then be moved into a position for seating in Other objects and advantages reside in the de the groove or valley M of the other drive disk tails of construction and operation as more fully and as the rotation of the drive disks continues, hereinafter described and claimed, reference be the trailing ‘edge C of the groove or valley will ing had to the accompanying drawing forming also act to continue the rotation of the disk I5. part hereof, wherein like numerals refer to like Thus both the cam humps l3 and the .cam parts throughout, and in which: grooves or valleys [4 function to engage the pegs Figure 1 is a side elevational view of the drive I6 and I‘! for driving the disk I5 and the sprock mechanism. et 9. Figure 2 is a sectional view taken substantially The feed sprocket 9 is thus driven with long on a line 2—2 of Figure 1, and pauses in a substantially step-by-step movement. Figure 3 is a transverse sectional View of the In view of the foregoing description, taken in ' driving cams taken substantially on a line 3——3 30 conjunction with the accompanying drawing, it of Figure 1. is believed that a clear understanding of the con Referring now to the drawing in detail, where struction, operation and advantages of a drive in for the purpose of illustration I have disclosed mechanism of this character will be quite ap a preferred embodiment of .the invention, the parent to those skilled in the art.- A more de numeral 5 designates a portion of the housing tailed description thereof is accordingly deemed of the motion picture projector in which a drive unnecessary. ' shaft 6 and driven shaft 1 are journaled. It is to be understood, however, that even The driven shaft 1 is journaled in an eccentric though I have herein shown and described a pre bushing 8 by means of which the shaft 1 may be ferred embodiment of my invention, that the adjusted to take up wear in the drive mecha same is susceptible to certain changes fully com nism. -' prehended by the spirit of the invention as here A ?lm sprocket 9 is secured to the shaft 1 for in described, and the scope of the appended feeding the ?lm through the projector at a de claims. ' sired uniform speed and to maintain a loop in Having thus described the invention, what I the ?lm of a desired size to prevent cracking or claim is: breaking of the film. 1. A sprocket drive for motion picture projec Secured to the drive shaft 6 is a pair of cam tors and comprising a pair of spaced-apart driv disks I0 and II maintained in spaced-apart rela ing cams, each of said cams having a radially tion by a spacing washer I2. projecting hump and a substantially shallow Each of the disks is formed on the peripheral valley at diametrically opposite edges of the cam, edge thereof with a tapering cam hump l3 and a drive shaft connected to the cams and with the at a diametrically opposite edge with a shallow hump of each cam arranged adjacent the valley groove 0r valley [4. of the other cam, a driven disk, a feed sprocket The disks [0 and H are secured on the shaft attached thereto, and pegs projecting from op 6 in a position so that the hump l3 of one of the 55 posite faces of the disk for alternate engagement 2,406,595 4 3 3. A sprocket drive for motion picture projec tors and comprising a pair of spaced-apart driv by the humps and valleys to rotate the disk in a step-by-step movement. 2. A sprocket drive for motion picture projec ing cams, each of said cams having a radially projecting hump and a substantially shallow valley at diametrically opposite edges of the cam, tors and comprising a pair of spaced-apart driv ing cams, each of said cams, having a radially projecting hump and a substantially shallow valley at diametrically opposite edges of the cam, a drive shaft connected to the cams and with the hump of each cam arranged adjacent the ‘valley of the other cam, .a driven disk, a fe'ed'sprocket attached thereto, and pegs projecting from op a drive shaft connected to the cams and with the hump of each cam arranged adjacent the valley of the other cam, a driven disk having its edge ‘positioned between the cams, a feed sprocket at 10' tached to the disk, andpegs projecting ‘from op posite faces of the disk and disposed in the path of the humps and adapted to enter said valleys for successively rotating the disk in a step~by step movement. posite faces of the disk and disposed in the path of the humps and adapted to enter said valleys for driving engagement by the trailing edges of the valleys for successively rotating the disk in a 15 step-by-step movement. CHARLES W. DYER.