Slide changing apparatus with slide jam protection
US4933690A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 1988 |
| Grant date | Jun 12, 1990 |
| Priority date | — |
| Expiry date | Oct 31, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B23/046
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A slide changing apparatus is disclosed for use in a projection apparatus wherein photographic slides can be projected onto a screen or viewed on a video monitor. The slide changing mechanism includes a lever having a displaceable part which engages a slide and transfers the photographic slide from a projection position to a slide tray wherein slides are accommodated. A microprocessor controls the operation of a driving apparatus which is connected to the lever and actuates the lever. If a slide becomes jammed during movement between the projection position and the slide tray the displaceable part of the lever becomes displaced from its original position. The displacement of the displaceable part is detected by an optical switch and the optical switch outputs a signal to the microprocessor to stop the motor before damage to the jammed slide can occur.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.