PURPOSE: To reduce the twist of a film carrier and the damage of a sprocket hole which are caused by inserting a positioning pin, by fixing at least one sprocket hole by using spring tension, and pulling a film carrier in the direction opposite to the moving direction.

CONSTITUTION: Sprocket holes 9 facing in the width direction of a film carrier 8 are mounted on the one side both end portions on the upper surface of a retaining plate 2, and two positioning pawls 1 are mounted at the positons matching with the sprocket holes 9. The retaining plate 2 is supported at the lower surface center part, by a spring 3 which is expanded and contracted in the up and down direction by a cylindrical protrusion 5. Sprocket gear 6 can apply tension to the longitudinal direction of the film carrier 8, by rotating protrusions 7 in the direction opposite to the moving direction of the film carrier 8, with a motor in the state that the protrusions 7 are inserted into the sprocket holes 9. Thereby the film carrier can be prevented from lifting, deforming and twisting.