PURPOSE: To prevent the exposure to light when dismantled, by installing the locking component capable of reciprocally shifting from the state that the reversion of the roller in a magazine is prevented by its engagement therewith to the state that the reversion is allowed by disconnection of the engagement in a laser type photo-composing machine or the like.

CONSTITUTION: The sensitive material 9 exposed to light with a type photo-composing machine is inserted into the body 1 of magazine, is pressed to a roller 2 along a support plate and is wound up by the rotation of the roller 2. At that time, the roller 2 is counterclockwise rotated with a drive gear 3 and the cam 6 for locking engaged therewith is clockwise rotated. Then, its engagement is separated and the roller 2 can wind the sensitive material 9. When the body 1 of magazine is dismantled from the body 12 of type photo-composing machine after completing the winding, the wound sensitive material 9 is pulled in the direction of winding back because it is pinched with shading components 16. However, the teeth of one side part 6a of cam 6 is engaged with a gear 3 by the clockwise rotational force of roller 2 and the sensitive material 9 is prevented from drawing out. Thus, when the magazine is dismantled from the body of laser type-photo composing machine or the like, the exposure to light can be prevented by blocking the reversion of roller.