Projector with controls for the slide changer

US4130353A · kind A · utility

Assignee

• Ernst Leitz Wetzlar, GmbH · DE

Inventors

• Kurt Henkelmann · Wismar, DE
• Rolf Speier · Wismar, DE
• Wilhelm Schafer · Witten, DE

Key dates

• Filing date: Dec 13, 1977
• Grant date: Dec 19, 1978
• Expiry date: Dec 13, 1997

Classification

• Technology area (CPC G): Physics
• CPC primary: G03B23/048
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A slide projector with controls for the slide changing system and for the stop associated with the slide changing system where there are separately moving insertion and storage feeder arms for the slide changer, and at least two routes for inserting and removing the slides. Preferred motor driven cams (B",R",S",T") act as controls for the stop (8,11) and for slide changing and are operationally timed so that the closing process for the stop is initiated simultaneously or nearly simultaneously with the beginning of the removal of the projected slide (19a) from the slide stage plane and with the insertion of a new slide (19c). The process of stop opening begins immediately and without any pause after the complete closure of the stop which coincides with the terminated insertion of the new slide. Interlocking means (14-18) are provided in the slide stage (20) which keep the stop closed in a change process where there is no slide insertion and which means are overridden when the first new slide is introduced or when the previous one is reinserted, the override taking place through the slide itself.