Lens-fitted photo film unit and method of producing the same

A lens-fitted photo film unit as defined in claim. 5, further comprising:

• a spool contained in said cassette in rotatable fashion, a trailer of said photo film being secured to said spool;
• a winding wheel, mounted on said top wall of said cassette containing chamber, operated externally, for rotating said spool;
• and
• a reversal preventing claw, disposed on said top wall of said cassette containing chamber, engaged with said winding wheel, for hindering said winding wheel from rotating said spool in reverse to winding of said photo film;
• wherein said support shaft receives said reversal preventing claw when said reversal preventing claw is deformed in reverse to winding of said photo film, so as to avoid further deformation of said reversal preventing claw, to stabilize hindrance of said winding wheel from said reverse rotation.

A method of producing a lens-fitted photo film unit, said lens-fitted photo film unit having a housing in which a photo film roll chamber and a cassette containing chamber are formed, wherein said cassette containing chamber contains a cassette, said roll chamber contains a roll of photo film drawn from said cassette, said cassette incorporates a port shutter rotatable between a closed position of closing a photo film passage port and an open position of opening said passage port, said photo film is wound into said cassette as much as one frame each time one frame is exposed, and said cassette is removed from said cassette containing chamber after winding said photo film entirely into said cassette, said lens-fitted photo film unit comprising:

• an exit opening through which said cassette is removed from said cassette containing chamber;
• an openable lid disposed to close said exit opening, and opened for said removal of said cassette;
• a rotating member, engaged with said port shutter, and rotatable integrally with said port shutter, said rotating member having a first position when said port shutter has said open position, and a second position when said port shutter has said closed position;
• a bias member for biasing said rotating member from said first position to said second position;
• and a retainer member, extended from said lid toward said rotating member, disposed movably, and when said lid is closed, said retainer member retaining said rotating member in said first position against said bias member, wherein said retainer member is moved in response to said opening motion of said lid, to release said rotating member from retention, and said bias member rotates said port shutter to said second position;
• said producing method comprising steps of:
• combining said retainer member with said rotating member, to retain said rotating member in said open position;
• mounting said rotating member on said housing with said rotating member retained by said retainer member;
• combining said bias member with said rotating member with said rotating member retained by said retainer member, to bias said rotating member against said retainer member, wherein said housing is conveyed with said rotating member, said retainer member and said bias member to where said housing is loaded with photo film and said cassette.

A lens-fitted photo film unit, having a photo film roll chamber and a cassette containing chamber, wherein said cassette containing chamber contains a cassette, said roll chamber contains a roll of photo film drawn from said cassette, said cassette incorporates a port shutter rotatable between a closed position of closing a photo film passage port and an open position of opening said passage port, said photo film is wound into said cassette as much as one frame each time one frame is exposed, and said cassette is removed from said cassette containing chamber after winding said photo film entirely into said cassette, said lens-fitted photo film unit comprising:

• a rotating member, disposed on a top wall of said cassette containing chamber, engaged with said port shutter, and rotatable integrally with said port shutter, said rotating member having a first position when said port shutter has said open position, and a second position when said port shutter has said closed position;
• a bias member for biasing said rotating member from said first position to said second position;
• a retainer member, disposed movably toward and away from said rotating member, contacted on said rotating member, for retaining said rotating member in said open position against said bias member;
• and
• a releasing member for moving said retainer member away from said rotating member during a period beginning when said photo film is exposed for a final frame, and ending when at least one portion of said cassette containing chamber is opened for removal of said cassette, wherein said rotating member is released from retention in said open position, and said bias member rotates said port shutter to said closed position.

A lens-fitted photo film unit, having a photo film roll chamber disposed at a left portion thereof and a cassette containing chamber disposed at a right portion thereof, wherein said cassette containing chamber contains a cassette, said roll chamber contains a roll of photo film drawn from said cassette, said cassette incorporates a port shutter rotatable between a closed position in which a photo film passage port is closed and an open position in which said passage port is open, said photo film is wound into said cassette by one frame each time one frame is exposed, and said cassette is removed from said cassette containing chamber after winding said photo film entirely into said cassette, said lens-fitted photo film unit comprising:

• an exit opening through which said cassette is removed from said cassette containing chamber, said exit opening being formed at a position corresponding to said cassette containing chamber and in a bottom of said lens-fitted photo film unit;
• an openable lid disposed to close said exit opening, and opened for said removal of said cassette;
• a port shutter rotating mechanism, connected to said port shutter, for rotating said port shutter from said open position to said closed position, said port shutter rotating mechanism being disposed at a position corresponding to said cassette containing chamber and at an upper portion of said lens-fitted photo film unit, further said port shutter rotating mechanism including a bias member for urging said port shutter to said closed position;
• and
• a retainer member for retaining said port shutter rotating mechanism so as to keep said port shutter open, when said retainer member releases said port shutter rotating mechanism, said port shutter rotating mechanism being moved by said bias member, causing said port shutter to be rotated from said open position to said closed position.