Film tension maintenance means for use in roll-film camera
AssigneeFuji Photo Film Co., Ltd.
InventorShigeru Oshima
Life of this patent
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Abstract
A film tension maintenance means for use in a roll-film camera comprising a simply mounted, expandable clasp element, which exerts evenly distributed force on opposite sides of a take-up spool and maintains the take-up spool in a vertical alignment, and steadily expands as film is wound onto the take-up spool, while maintaining pressure countering any tendency of the wound film to uncoil, thereby to ensure unhindered film wind-up and accurate advance of successive film frames to an exposure position.
Claims1
In a camera including a camera body, a feed spool and a take-up spool rotatably mounted within said camera body, a film loaded on said feed spool and being steadily wound from said feed spool onto said take-up spool for exposure of successive film frames through a camera lens, the improvement comprising:
- an expandable clasp element for tensioning said film, said element including a base portion and a pair of arms, said element being formed by a strip of tensile material bent into caliper shape to form said base portion and said two arms which extend from said base portion and tend to close towards one another,
- said camera body being provided with a slot to the side of said take-up spool, said slot receiving said base portion with said arms extending from said slot and being fitted around the central portion of said take-up spool and film wound thereon to grip the film and to maintain pressure thereon countering any tendency of the wound film to uncoil.
Dependencies are inferred from the claim text.