US1236498A - Mechanical movement. - Google Patents

Description

R. P. STINEIVIAN I 0. 0. TAYLOR..

MECHANICAL MOVEMENT..

APPLICATION FILED ocT. 5, 1915.

Patent-ed Aug. 14,7191?.

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RALPH P. S'ILINEMAN` AND ONA 0. TAYLOR, OF SAN DIEGO, CALIFORNIA.

MECHANICAL MOVEMENT.

v Application filed October 5, 1915.

To all 'whom z5 may concern.'

Be it known that RALPH P. STINEMAN and ONA O. TAYLOR, citizens of the United States of America, residing at San Diego, in the county of San Diego and State of California, have invented certain new and useful Improvements in Mechanical Movements, of which the following is a specification.

This invention relates to motion picture machines and more particularly to the mechanism for imparting movement to the film carrying sprocket wheels.

The object of the invention is to provide a structure which while it will not present more than the usual number of pictures, per minute, before the lens will impart a very swift movement to the lmduring the time that the film is in motion. Consequently much of the usual objectionable flicker will be eliminated and the amount of light required will be reduced.

Further objects and advantages of the invention will be set forth in the detailed description which now follows.

The figure shown in the accompanying drawing is a plan view illustrating the preferred embodiment of the invention.

Referring to the drawing the numeral 5 designates the main driving shaft which carries a balance or Hy wheel 6. Motion may be imparted to shaft 5 through the medium of a pinion 7. Shaft 5 has a pinion 8 which meshes with a gear wheel 9. The gear wheel 9 has twice as many teeth as the pinion 8 and consequently rotates at half the speed of shaft 5. The gear wheel 9 is mounted upon a shaft 10 which carries a cam disk 11. This cam disk carries a cam rib 12 which engages in a groove 13 of a collar 14, the latter being splined upon shaft 5 through the medium of key 15. The usual film carrying sprocket wheels 16 are mounted upon a shaft 17 and a Geneva movement of the well known type is disposed between the shafts 5 and 17, and through this movement motion is imparted to shaft 17 from shaft 5. This movement comprises a star wheel 18, a disk 19, a boss 2O having a cut out portion 21, and a pin 22, which engages within the slots of the star wheel in the usual and well known way. By splining collar 14 disk 19 and boss 2O which are all in one piece upon shaft 5 and imparting sliding movement Copies of this patent may be obtained for ve cents each, by addressing the Specification of Letters Patent.

Patented Aug. 14:, 1917. Serial No. 54,155.

through the medium of the rib 12, to these parts pin 22 is withdrawn from engagement with the slot of the star wheel at every other revolution of the shaft 5. Consequently if the star wheel and shaft 5 be rotated at double the usual rate of speed it follows that when the pin 22 is in engagement with the slot of the star wheel motion will be imparted to the shaft 17, at twice the usual rate of speed, but since every other revolution of the shaft 5 imparts no movement to shaft 17 it follows that only the usual number of pictures per minute will be brought before the lens.

I/Vhile the elements shown and described are well adapted to serve the purposes for which they are intended it is to be understood that the inventive idea disclosed may be embodied in many other forms, and that the invention is not limited to the precise construction set forth, but includes within its purview whatever changes may be made that are within the spirit of the appended claim.

I-Iaving described our invention what we claim is:

In a device of the character described the combination with a main driving shaft, of a fly wheel mounted thereon, a half-time shaft mounted in parallelism with the main driving shaft, means for driving said halftime shaft from said main driving shaft, a sprocket carrying shaft, a Geneva movement between the sprocket shaft and the main driving shaft, a grooved one of the elements of the Geneva movement, said element being slidably mounted upon the main driving shaft, a cam disk provided with a cam rib, said cam disk being mounted upon the half-time shaft and said cam rib entering the groove in said collar, said cam serving to shift the slidably mounted member of the Geneva movement in such manner that said Geneva movement is caused to skip at each alternate revolution of the main driving shaft.

In testimony whereof we affix our signatures in the presence of two witnesses.

RALPH P. STINEMAN. ONA O. TAYLOR. Witnesses:

WILLIAM KETTNER, MARY G. GREENHAW.

Washington, ID. C.

collar carried by v

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