JPH03260642A - Photograph film cartridge - Google Patents

Abstract

PURPOSE:To lower the axial torque of a spool and to stably feed out the film by setting a coefficient of friction of one inner wall of a cartridge and the film to a specific value or below. CONSTITUTION:As for this cartridge, a coefficient of friction of at least a part of an inner wall of a cartridge main body 5 and a film 2 is set to <=0.25. For instance, the main body 5 is molded by a stylene resin obtained by adding silicone oil as a lubricant by a prescribed quantity, the top part of ribs 8, 9 formed in a prescribed position on an inner wall of the main body 5 is rounded by a circular arc of a radius R, and also, ruggedness 8a whose different of height is a prescribed value is formed. In such a way, a lubricant can be applied onto the surface of the ribs 8, 9, and also, lining of a fluororesin can be executed. Moreover, a lubricating mat agent and a lubricant, etc., can be added to the film 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a photographic film cartridge in which the leading end of the film is fed out by rotating a spool.

[Prior Art] In order to simplify the loading operation into a camera, even the leading edge of the film is rolled up into the cartridge body when unused, and after loading the photographic film cartridge into the camera, it is rolled up by the mechanism on the camera side. U.S. Pat.
．． This is proposed in Publication No. 11306.

In the photographic film cartridge described in the above publication, flanges are provided at both ends of the spool around which the film is wound, and inwardly bent portions are formed on the outer peripheries of these flanges. These bent portions press down on both side edges of the outermost film wound on the spool to prevent the film from loosening when the spool is rotated. A film ejection port is formed in the main body of the cartridge that rotatably stores the spool, and at the back of this film ejection port, the bent part is pushed out to make it easier to pull out the film, and the tip of the film is inserted into the film. A claw is provided for scooping it out of the roll. When the spool rotates and the leading edge of the film moves to a position facing the film discharge port, the leading edge of the film is guided out from between the folded parts that are pushed apart by the claws and sent out from the film discharge port. It becomes like this.

Further, in the photographic film cartridge described in U.S. Pat. No. 4,832,275, two rings are rotatably fitted into the inner wall of the cartridge body, and these rings prevent the film from loosening from the spool or being deformed. There is. These rings are oblique to the axis of rotation of the spool so that they widen at a position facing the film outlet of the cartridge body. After the spool is rotated and the tip of the film is scooped up by a claw provided on the inner wall of the cartridge body, the film is led out from between the two rings to the discharge port.

Claims (1)

[Claims] (1) It has a spool around which a film is wound, and a cartridge main body that rotatably stores the spool and stores the film up to its tip, and has at least a part of the inner wall of the cartridge main body in contact with the outermost periphery of the film. In a photographic film cartridge in which the leading end of the film is sent out of the cartridge body by rotation of the spool by preventing loosening of the film, the coefficient of friction between at least a part of the inner wall and the film is set to 0.25 or less. A photographic film patrone featuring the following.