Film feed device for motion-picture apparatus

Abstract

Abstract FEED DEVICE FOR INTERMITTENTLY FEEDING CINEFILM AT INTERVALS CORRESPONDING TO HALF A STANDARD FRAME. TWO PULLDOWN CLAWS ARE CONNECTED TO TWO FORKS AT THE ENDS OF THEIR UPPER LEGS SUCH THAT THEY ARE SPACED IN THE DIRECTION OF THE FILM TRACK FROM EACH OTHER BY A DISTANCE EQUAL TO A HALF THE PERFORATION PITCH AND FACE THE SERIES OF FILM PERFORATIONS. THE FORKS ARE SLIDABLY AND ROTATABLY ENGAGED AT THE ENDS OF THEIR LOWER LEGS ON DIAMETRICALLY OPPOSITE PORTIONS OF A FACE CAM MOUNTED ON A ROTARY SHAFT PARALLEL TO A SHUTTER SHAFT ON WHICH AN ECCENTRIC CAM IS SECURED. THE FACE CAM IS ROTATED AT A SPEED EQUAL TO HALF THE SPEED OF ROTATION OF THE ECCENTRIC CAM AND FOR EACH COMPLETE REVOLUTION OF THE SHUTTER SHAFT, BOTH CLAWS EFFECT ONE SIMULTANEOUS RECIPROCATING MOVEMENT IN THE DIRECTION OF THE FILM MOVEMENT BY ONE OF THE FORKS WHICH IS ENGAGED WITH THE ECCENTRIC CAM, WHILE THEY ALTERNATELY ENTER THE FILM PERFORATIONS BY THE ACTION OF THE FACE CAM TO MOVE THE CINFILM. ALTERNATIVELY BOTH CAMS MAY BE MOUNTED ON THE SHUTTER SHAFT AND A CAM FOLLOWER SLIDABLY AND ROTATABLY ENGAGED WITH THE ECCENTRIC CAM. TWO PULLDOWN CLAWS ARE MOVABLY MOUNTED ON THE FOLLOWER AND ARE RESILIENTLY URGED INTO THE FILM PLANE. A PROJECTION ON THE FOLLOWER CONTACTS THE FACE CAM.

Inventors

• 👤 Yoshikuni Nozawa

Bibliographic Details