Clutch unit and camera

A clutch unit comprising:

• a driving shaft that can be rotated in both directions;
• a driven shaft located coaxially relative to said driving shaft;
• and
• a coil spring having a coil portion for frictionally engaging with said driven shaft and arm portions extending from both ends thereof for abutting said driving shaft,
• wherein when said driving shaft is rotated in one direction,
• said driving shaft abuts one of said arm portions of said coil spring,
• said coil portion of said coil spring drives said driven shaft,
• friction between said driven shaft and an engaging part of said coil portion increases, and
• rotation in one direction of said driving shaft is transmitted to said driven shaft so that said driven shaft can be rotated, and
• wherein when said driving shaft is rotated in an opposite direction,
• said driving shaft abuts the other arm portion of said coil spring,
• said coil portion of said coil spring drives said driven shaft
• friction between said driven shaft and said engaging part of said coil spring increases, and
• rotation in the opposite direction of said driving shaft is transmitted to said driven shaft so that said driven shaft can be rotated.

A clutch unit comprising:

• a driving shaft to be driven to rotate in both directions;
• and
• a driven shaft located coaxially relative to said driving shaft operatively connected so that a driving force exerted for rotating said driving shaft is transmitted to said driven shaft,
• wherein when a rotating speed at which said driven shaft is rotated in at least one direction exceeds a rotating speed at which said driving shaft is rotated, said driving shaft and driven shaft are disengaged from transmission of power.

A clutch unit comprising:

• a driving shaft;
• a driven shaft;
• and
• a coil spring having a coil portion engaged with said driven shaft for transmitting rotation of said driving shaft,
• wherein said coil spring drives said driven shaft, whether said driving shaft is rotated clockwise or counterclockwise.

A clutch unit comprising:

• a driving shaft;
• a driven shaft;
• and
• a coil spring having arm portions extending from both ends thereof and a coil portion engaging with said driven shaft for transmitting rotation of said driving shaft,
• wherein, for transmitting rotation in one direction of said driving shaft to said driven shaft, said driving shaft abuts on one of said arm portions of said coil spring, and, for transmitting rotation in an opposite direction of said driving shaft to said driven shaft, said driving shaft abuts the other arm portion of said coil spring, and said coil spring drives said driven shaft.

A clutch unit comprising:

• a driving shaft to be driven to rotate in both directions;
• and
• a driven shaft located coaxially relative to said driving shaft operatively connected so that a driving force exerted for rotating said driving shaft is transmitted to said driven shaft,
• wherein when rotation in at least one direction of said driven shaft is greater than rotation of said driving shaft, said driving shaft and driven shaft are disengaged from transmission of power.

A clutch unit comprising:

• a driving shaft that can be rotated in both directions when influenced by a driving force exerted from a drive source;
• a driven shaft located coaxially relative to said driving shaft;
• and
• a coil spring having a coil portion for frictionally engaging with said driven shaft and arm portions extending from both ends thereof adapted to abut said driving shaft, coupling and uncoupling said driving shaft and driven shaft,
• wherein when said driving shaft is rotated in one direction,
• said driving shaft abuts one of said arm portions of said coil spring,
• said coil portion of said coil spring drives said driven shaft,
• friction between said driven shaft and an engaging part of said coil portion increases, and
• rotation in one direction of said driving shaft is transmitted to said driven shaft so that said driven shaft can be rotated, and
• wherein when said driving shaft is rotated in an opposite direction,
• said driven shaft abuts the other arm portion of said coil spring,
• said coil portion of said coil spring drives said driven shaft,
• friction between said driven shaft and said engaging part of said coil portion increases, and
• rotation in the opposite direction of said driving shaft is transmitted to said driven shaft so that said driven shaft can be rotated.

A camera having a photographic lens barrel that is interposed between a film cartridge chamber and a film wind chamber and defines an optical axis substantially perpendicular to an exposure screen mask, and a clutch unit that comprises:

• a driving shaft that can be driven to rotate in both directions;
• a driven shaft located coaxially relative to said driving shaft;
• and
• a coil spring having arm portions capable of engaging with said driving shaft, and a coil portion for frictionally engaging with said driven shaft, said coil portion being adapted to drive said driven shaft in both directions, and being adapted to transmit a driving force, which is exerted for rotating said driving shaft in either direction, to said driven shaft;
• wherein said clutch unit is located in a space created between the film cartridge chamber and the photographic lens barrel or between the film wind chamber and the photographic lens barrel.

A camera having a film cartridge chamber, a film wind chamber, a photographic lens barrel, and a clutch unit that comprises:

• a driving shaft;
• a driven shaft;
• and
• a coil spring to be engaged with said driven shaft for transmitting rotation of said driving shaft,
• wherein said coil spring drives said driven shaft whether said driving shaft is rotated clockwise or counterclockwise by tightening on said driven shaft to thereby transmit a driving force from said driving shaft to said driven shaft;
• and
• wherein said clutch unit is located in a space created between the photographic lens barrel and the film cartridge chamber or between the photographic lens barrel and the film wind chamber.

A camera having a film cartridge chamber, a photographic lens barrel, and a clutch unit that comprises:

• a driving shaft;
• a driven shaft;
• and
• a coil spring having arm portions extending from both ends thereof and a coil portion engaging with said driven shaft, and thus transmitting rotation of said driving shaft, and
• wherein, for transmitting rotation in one direction of said driving shaft to said driven shaft, said driving shaft of said clutch unit abuts one of said arm portions of said coil spring and, for transmitting rotation in an opposite direction of said driving shaft to said driven shaft, said driving shaft abuts the other arm portion of said coil spring, said coil spring driving said driven shaft;
• said clutch unit being located in a space created between the photographic lens barrel and the film cartridge chamber or between the photographic lens barrel and the film wind chamber.

A camera, having a photographic lens barrel that is located on a film feeding path linking a film cartridge chamber and a film wind chamber and defines an optical axis substantially perpendicular to an exposure screen mask, comprising:

• a driving shaft that can be driven to rotate in both directions;
• a driven shaft located coaxially relative to said driving shaft operatively connected so that a driving force exerted for rotating said driving shaft is transmitted to said driven shaft;
• a first driving system for driving and rotating said driven shaft;
• a second driving system for driving and rotating said driven shaft without said driving shaft;
• and
• a clutch unit, interposed between said driving shaft and driven shaft, for, when power exerted for rotating said driving shaft in one of both directions via said first driving system is transmitted to said driven shaft, if a rotating speed at which said driven shaft is rotated in said one direction by said second driving system is greater than a rotating speed at which said driving shaft is rotated, disengaging said driving shaft and said driven shaft from transmission of power,
• wherein said clutch unit is located in a space between the film cartridge chamber and the photographic lens barrel or between the film wind chamber and the photographic lens barrel.

A camera, having a photographic lens barrel that is located on a film feeding path linking a film cartridge chamber and a film wind chamber and defines an optical axis substantially perpendicular to an exposure screen mask and a clutch unit that comprises:

• a driving shaft that can be rotated in both directions when influenced by a driving force exerted from a drive source;
• a driven shaft located coaxially relative to said driving shaft;
• and
• a coil spring enabling coupling and uncoupling of said driving shaft and said driven shaft, and having a coil portion for frictionally engaging with said driven shaft and arm portions extending from both ends thereof so that the arm portions can abut said driving shaft,
• wherein when said driving shaft is rotated in one direction,
• said driving shaft abuts one of said arm portions of said coil spring,
• said coil portion of said coil spring drives said driven shaft,
• friction between said driven shaft and an engaging part of said coil portion is increased, and rotation in one direction of said driving shaft is transmitted to said driven shaft so that said driven shaft can be rotated;
• and
• when said driving shaft is rotated in an opposite direction,
• said driven shaft abuts the other arm portion of said coil spring, said coil portion of said coil spring drives said driven shaft,
• friction between said driven shaft and said engaging part of said coil portion is increased, and
• rotation in the opposite direction of said driving shaft is transmitted to said driven shaft so that said driven shaft can be rotated, and
• wherein said clutch is located in a space created between the film cartridge chamber and the photographic lens barrel or between the film wind chamber and the photographic lens barrel.