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US 4,050,650 AGranted
Synchronated index film drive mechanism
OwnerEdward R. Wadleighinventor
Life of this patent
Estimating the term…
Abstract
A data film capstan about which a high speed data microfilm is wrapped is directly mechanically linked by a gear speed reduction mechanism to an index film capstan having an index film wrapped thereabout for driving the index film in synchronism and at a predetermined reduced speed for easy index data viewing.
Claims6
In a microfilm viewer or the like including:
- a data microfilm,
- means for moving said data microfilm at relatively high speed for selective data projection upon stoppage of said moving means,
- the improvement comprising:
- an index film mounted within said viewer for movement, said index film carrying index data corresponding to the microfilm data and adapted for viewing during movement of said index film, and
- speed reduction mechanical drive means linking the surfaces of respective films wherein, the microfilm directly drives the idex film at a speed slower than said speed of microfilm movement thereby permitting index data on said index film to be visibly read during movement of said microfilm and index film.
2 more elements
In a microfilm viewer or the like including:
- a microfilm supply reel, a microfilm take up reel, means for rotatably mounting said reels at spaced apart locations, a microfilm coupled at respective ends to said supply reel and said take up reel and reelable therebetween, motor means for selectively driving said reels to effect microfilm movement bidirectionally between said reels, the improvement comprising:
- a data film capstan mounted on a shaft for rotation about an axis parallel to the axis of said reels and in periheral engagement with said mircofilm at a point intermediate of said reels,
- an index film mounted within said viewer for movement, said index film carrying an index data corresponding to the microfilm data and adapted for viewing during movement of said index film,
- an index film capstan mounted on a shaft for rotation about its axis and in peripheral contact with said index film for driving said film, and
- geared transmission shaft means mechanically coupling the shaft of said data film capstan and that of said index film capstan for rotation of said index film at a slower speed than that of said data film;
- whereby, energization of said motor means and movement of said data microfilm causes said data microfilm to directly drive through said gear transmission shaft means, said index film capstan and said index film in contact therewith at a speed permitting the index data to be visibly read from said moving index film during microfilm movement.
3 more elements
Dependencies are inferred from the claim text.