US 4,435,056 A · Film feeding device

Abstract

When a camera is loaded with a film cassette, information corresponding to the diameter of a film wind shaft with film wound thereon is detected by a film cassette type switch. An address of a ROM is designated by the shaft diameter information, and shaft rotation angle information corresponding to the designated address is read out from the ROM. The film wind shaft is rotated through an angle corresponding to the rotation angle information by the driving force of a pulse motor. When a fixed length of a film is wound on the film wind shaft, the shaft diameter information is updated, a new piece of rotation angle information is read out from the ROM in accordance with the updated shaft diameter information, and the film wind shaft is rotated to be wound with the constant length of the film in accordance with the updated rotation angle information.

Claims12

Dependent claims

A film feeding device comprising:

film wind driving means engaging a film wind shaft and rotating said film wind shaft to wind a film on said film wind shaft;
shaft diameter information producing means for producing information representing the diameter of said film wind shaft with said film wound thereon;
means for updating the shaft diameter information from said shaft diameter information producing means every time a given length of the film is wound on said film wind shaft;
means for deciding the rotation angle of said film wind shaft and producing a rotation angle information in accordance with the shaft diameter information from said shaft diameter information producing means;
and
means for driving said film wind driving means in accordance with the rotation angle information from said rotation angle information producing means, whereby said film wind shaft is rotated through an angle corresponding to said rotation angle information.

3 more elements

A film feeding device comprising:

film wind driving means engaging a film wind shaft of a film cassette which contains a film therein and rotating said film wind shaft to wind the film on said film wind shaft;
shaft diameter information producing means attached to said film cassette and detecting a characteristic portion corresponding to the diameter of said film wind shaft with said film wound thereon to produce shaft diameter information;
shaft diameter information updating means for updating the shaft diameter information from said shaft diameter information producing means every time a given length of the film is wound on said film wind shaft;
means for deciding the rotation angle of said film wind shaft and producing rotation angle information in accordance with the shaft diameter information from said shaft diameter information producing means;
and
means for driving said film wind driving means in accordance with the rotation angle information, whereby said film wind shaft is rotated through an angle corresponding to said rotating angle information.

3 more elements

Dependencies are inferred from the claim text.

Film feeding device

Life of this patent

Film feeding device

Life of this patent

Abstract

Claims12