Film media take-up spindle with automatic engagement pawl

A film media take-up spindle for use in power driven phototypesetter magazines, and including:

• a cylinder body having outide and inside walls with an entirely open interior and having a slot opening coextensively between the ends of the cylinder body and into said interior through said outside and inside walls and with a coextensively circumferentially faced leading edge extending between the ends of the cylinder body and facing away from the direction of take-up rotation,
• a supporting hub at each end of the body for rotation of the spindle and at least one of which is a drive hub to rotate the spindle, and
• an anchor pawl extending coextensively between the ends of the cylinder body and alternately opening and closing the slot and comprising an elongated bar-shaped lever member carried on coaxial pivots between the supporting hubs and having a coextensive semi-circular outside wall to continue the cylinder form of the outside wall of the body and a coextensive cam face circumferentially faced in the direction of take-up rotation and spaced from the coaxial pivot axis to oppose the coextensive circumferentially faced leading edge of the slot when the anchor pawl closes the slot and having a trailing edge spaced from the coaxial pivot axis and engageable by the film media entered through the slot and into the body a distance limited by the inside wall of the body diametrically opposite the slot when the anchor pawl opens the slot and to rotate the anchor pawl from the opened to a closed position with the film media compressively clamped between the leading edge of the slot and circumferentially opposed cam face of the anchor pawl when the film media wraps over said pawl and onto the take-up spindle, and alternately to release the anchor pawl to the opened position when the film media unwraps from the take-up spindle.