| 摘要 |
A spool which can automatically take up a film only by inserting the leading end portion thereof into a film insertion slot of the spool is provided. The spool comprises rotatable outer and inner cylinders, the former having insertion slots while the latter, pawls for engagement with perforations of film and positioned normally in nonalignment with the insertion slots by means of a spring. Upon insertion, the film moves along the inner surface of the outer cylinder and its perforation automatically engages with the pawl, thereby securely holding the film. Upon rewinding of the film, the pawls disengage from the perforations since the outer cylinder is held stationary by the film while the inner cylinder rotates. |
