Intermittent movement with tandem cams
US4017167A · kind A · utility
Inventor
Key dates
| Filing date | Mar 5, 1976 |
| Grant date | Apr 12, 1977 |
| Priority date | — |
| Expiry date | Mar 5, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B1/22
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In the present cam-driven intermittent movement for motion picture machines the pull-down action is shared by a plurality of cams mounted on a common shaft and operating in tandem, thereby reducing the noise and vibration and/or permitting faster pulldown. One cam drives a claw arm in its swinging movement about a pivot, while the other cam drives a carrier arm which is pivoted at one end on the machine frame and carries at its other end the claw arm pivot. Meshing action of the claw may be controlled by cam action applied to either arm. Such action may be derived from the same cam as the pull-down action, or may employ an auxiliary meshing cam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.