Film intermittent feed mechanism in film projectors

Claim 2

In a film projector, a film intermittent feed mechanism said mechanism comprising; claw means adapted to engage a row of perforations provided along a side edge of the film in said projector; cam means operatively engageable with said claw means for positioning said claw means into engagement with said film perforations and to thereby intermittently feed the film, still picture projecting means adapted to retain said cam means in a position in which said claw means is disengaged from said film perforations even when said cam means is operated whereby feed of the film is stopped so as to project a still picture; and means adapted to be actuated during a still picture projecting sequence for advancing the film one frame said advancing means comprising a pin having an annular flange engageable with said cam means, spring-biased lever means connected to said claw means having pivotal motion imparted thereto in response to actuation of said lever means by said pin so as to release said claw means and advance said film one frame, and said pin engaging said cam means for locking said claw means into a stationary position after said film completes its advance.

Claim 3

In a film projector, a film intermittent feed mechanism said mechanism comprising a claw member pivotably and slidably mounted on a pin at an intermediate point thereof and having claws formed at one end for engagement with film perforations; first cam means rotatably acting on the other end portion of said claw member to impart a pivotal movement to said claw member about said pin; second can means for effecting a sliding movement of said claw member along said pin when the claws of said claw member have been brought into engagement with the film perforations upon pivotal movement of said claw member so as to advance the film; means for stopping feed of the film by acting on said other end portion of said claw member to impart a pivotal movement to said claw member releasing the film from engagement therewith and disengaging said claw member from said first cam means, said feed stopping means including a pivotably Mounted lever, said lever having one end adapted to engage said other end portion of said claw member, lever-operating means for effecting a pivotal movement of said lever to actuate said other end of said claw member so as to impart a pivotal movement of said claw member for releasing the film from engagement with the claws of said claw member; and means for advancing the film one frame during a still picture projecting sequence, said advancing means being adapted to release said lever from said lever-operating means for a portion of the time interval required for a complete revolution of said first cam means said advancing means comprising a pin having an annular flange engageable with said cam means, spring-biased lever means connected to said claw means having pivotal motion imparted thereto in response to actuation of said lever means by said pin so as to release said claw means and advance said film one frame, and said pin engaging said cam means for locking said claw means into a stationary position after said film completes its advance.

Claim 4

In a film projector, a film intermittent feed mechanism said mechanism comprising a claw member pivotably and slidably mounted on a pin at an intermediate point thereof and having claws formed at one end for engagement with film perforations; first cam means rotatably acting on the other end portion of said claw member to impart a pivotal movement to said claw member about said pin; second can means for effecting a sliding movement of said claw member along said pin when the claws of said claw member have been brought into engagement with the film perforations upon pivotal movement of said claw member so as to advance the film; means for stopping feed of the film by acting on said other end portion of said claw member to impart a pivotal movement to said claw member releasing the film from engagement therewith and disengaging said claw member from said first cam means, said feed stopping means including a pivotably Mounted lever, said lever having one end adapted to engage said other end portion of said claw member, lever-operating means for effecting a pivotal movement of said lever to actuate said other end of said claw member so as to impart a pivotal movement of said claw member for releasing the film from engagement with the claws of said claw member; and means for advancing the film one frame during a still picture projecting sequence, said advancing means being adapted to release said lever from said lever-operating means for a portion of the time interval required for a complete revolution of said first cam means said advancing means comprising a pin having an annular flange engageable with said cam means, spring-biased lever means connected to said claw means having pivotal motion imparted thereto in response to actuation of said lever means by said pin so as to release said claw means and advance said film one frame, and said pin engaging said cam means for locking said claw means into a stationary position after said film completes its advance.