Control and regulating device for film transport in a film projector
US5106185A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Oct 26, 1990 |
| Grant date | Apr 21, 1992 |
| Priority date | — |
| Expiry date | Oct 26, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/48
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Control and regulating device for film transport in a film projector, with winding plates (62, 72) located on both sides of a film gate (8) and drivable by a single motor (61, 71), and with supply and takeup devices (3, 4) likewise disposed between the winding plates (62, 72) and film gate (8), the devices being drivable by at least one drive motor (51) to produce film loops on both side of the film gate (8) and with a transport device (2) between the supply and takeup devices (3 and 4). The drive motors (21; 51; 61, 71) for the winding plates (62 and 72), supply and takeup devices (3 and 4), and film transport device (2) are connected with sensors (25; 55; 65, 75) to detect the rpm and/or rotational direction, so that when a presettable rpm is exceeded or when one of the drive motors (21; 51; 61, 71) rotates in a rotational direction counter to the rotational direction predetermined by a higher-order operating control, all drive motors (21; 51; 61, 71) are braked simultaneously.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.