Synchronizing means for motor-drive systems
US4220403A · kind A · utility
Inventor
Key dates
| Filing date | Oct 2, 1978 |
| Grant date | Sep 2, 1980 |
| Priority date | — |
| Expiry date | Oct 2, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B31/04
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Two or more motor driven systems are maintained in synchronism by a recorded wave of sine form on a tape driven by one of said systems, a signal derived from said sine wave being used to drive a stepper motor or stepper motors included in the other system or systems. The invention is particularly applicable to the synchronization of a film passing through a camera or projector with a sound track recorded on a magnetic tape, or of a number of films passing through a plurality of projectors or cameras. By converting the sine wave to pulses and maintaining a count of the pulses, (a) derived from the control signal and (b) supplied to the stepper motor, synchronism is maintained despite inertia effects during repeated starting, stopping and reversal of the drive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.