Slide projectors
AssigneeHanimex Pty. Limited
InventorsRobert Edward Styles, John Cosmer Les Veaux
Life of this patent
Estimating the term…
Abstract
The projector for slides comprising a lens system having clips to hold slides; magazine tensioning means; a magazine indexing and slide positioning assembly comprising pivotally movable slide positioning means having an operative position where a slide is held transverse to the projection axis of the lens system and an inoperative position permitting the indexing of the magazine and including shutter means movable in timed relationship with the magazine to prevent projection during the indexing of the magazine; and a lens unit focusing system including relatively movable platforms which are selectively manually and/or power operable and linearly slideable lens unit support means operatively connected to the said platforms.
Claims10
In a slide projector having a casing, a lens system in the casing defining an optical axis, a drive shaft indexable through ninety degree steps to feed slides one by one into and out of a projection position across said optical axis, first arm means pivotally mounted in said casing on opposite sides of said projection position for rocking movement between extended hold-out positions and retracted positions, and second arm means pivotally mounted in said casing for rocking movement toward and away from said drive shaft into and out of positioning engagement with a slide in the projection position, an improved drive mechanism comprising:
- a cam assembly rotatably mounted in said casing;
- drive means including a drive gear mounted on said cam assembly and means that are operable when activated to rotate said drive gear through one revolution;
- a Geneva drive comprising a driving peg eccentrically mounted on said cam assembly and a Geneva cross wheel engageable with said peg and coupled to said drive shaft to turn the latter through a ninety degree step upon rotation of said peg by said cam assembly;
- first cam-and-follower means coupling said cam assembly to one of said arm means for rocking the latter in timed relation with the stepping of said drive shaft;
- and means coupling said one arm means to the other arm means for rocking the latter in timed relation with the stepping of the drive shaft.
Dependencies are inferred from the claim text.