Film cassette former

Abstract

The invention provides a cartridge forming device by which the shape of a shell plate can be formed close to complete roundness even under high speed. In the cartridge forming device that rounds and forms the shell plate of the cartridge for storing roll film for photography, it is provided with core metal having a cylindrical surface part, a rounding mechanism that cylindrically rounds the shell plate by pivotally and rotatably supporting a pair of first rollers and transferring a pair of the first rollers along the cylindrical surface part of the core metal while pressurizing the shell plate on the core metal and a guide mechanism that guides operations of the rounding mechanism so that a pair of the first rollers are transferred along the cylindrical surface part of the core metal.

Description

technical field [0001] The present invention relates to a film cassette forming device which forms a casing plate (body plate) of a film cassette for storing photographic film into a circular shape. Background technique [0002] The 35mm film for photography is used in the state stored in the film cartridge. The film cartridge is basically composed of a substantially cylindrical casing plate, a spool housed in the casing plate, and a lid closing the upper and lower ends of the casing plate. In addition, a light-shielding velvet ribbon known as plush is pasted on the inner surface of the end portion of the film outlet of the casing plate. [0003] A method of manufacturing a conventional film cartridge will be described. With reference to Fig. 6, at first, in order to form above-mentioned film box shell plate, cut so that vertical and horizontal dimensions are identical with the unfolded vertical and horizontal dimension of film box shell plate, the cut metal sheet is carri...

AI Technical Summary

Problems solved by technology

[0010] However, in the conventional shell plate forming apparatus, when the shell plate is rounded, when the bending process is performed at high speed, a slightly excessive bending portion occurs due to the rebound effect of the shell plate (refer to FIG. 7 53) of (B), there is a problem that the final product has a polygonal shape

[0011] In addition, when using elastic members such as springs to make the shell plate round, in high-speed occasions with an operating speed of 50 pieces / minute or more, the vibration becomes severe, and the operating track jumps and becomes unstable.

As a result, the pressure on the shell plate is not uniform, and there is a problem that the stability and accuracy of the processed shape of the circular shell plate are affected.

[0012] Furthermore, when the round shell plate is pressed against the mandrel with the concave surface of the mold, there is a possibility that sliding occurs between the concave surface of the metal mold and the outer surface of the shell plate, and the surface of the shell plate is damaged. The problem

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