Method of and apparatus for attaching light-shielding leader to photosensitive material roll

A method of attaching a light-shielding leader to a light-room loading photosensitive material roll comprising the steps of:

• mounting the photosensitive material roll on a take-up shaft,
• bonding a light-shielding film having a width larger than the width of the photosensitive material roll to the leading end portion of the photosensitive material roll,
• positioning a pair of slitters in respective slitting start positions on opposite sides of the leading end portion of the photosensitive material roll spaced from each other by a distance substantially equal to the width of the photosensitive material roll, and
• slitting the light-shielding film into a predetermined width larger than the width of the photosensitive material roll by moving the slitters away from each other in a direction parallel to the longitudinal axis of the take-up shaft while rotating the take-up shaft to take up the light-shielding film around the photosensitive material roll,
• wherein said positioning and slitting steps occur after said bonding step.