Film transport mechanism with torque limiting clutch

Details Film transport mechanism with torque limiting clutch Film transport mechanism with torque limiting clutch

1995-05-01

1997-12-02

Lee, Eddie C.

Photography

With film drive

Film movement limiting means

396411, 242356, 2425451, G03B 100

Patent

active

056946295

ABSTRACT:
A camera film transport mechanism includes a torque limiting one-way drive clutch for preventing film damaging excessive torque loading or reverse rotation of the drive. The clutch includes coaxial inner and outer members. A resilient arm extends generally tangentially from one of the members with a free end biased against the other member and engagable with a tooth or abutment thereon to transmit torque therebetween. A sloping surface on one or both of the tooth and the arm end limits torque transmission by camming the arm out of engagement when the friction force is overcome. Multiple arms and/or abutment teeth may be provided and the arms may be arranged for either compressive or tensile loading. Slip torque deviation is limited by making the engaging surfaces from diverse materials, for example, an amorphous polymer, such as polycarbonate styrene, for one surface and a semi-crystalline polymer, such as nylon or acetal, for the other.

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