The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 15, 1987
Filed:
Oct. 15, 1985
Tatsunari Arito, Kanagawa, JP;
Yu Tojo, Kanagawa, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A method of preventing the occurrence of blackened margins on a photosensitive sheet processed in an electrophotographic apparatus. The method comprises the steps of calculating a first sheet transporting length by which the photosensitive sheet is required to be transported until the forward end of an image area of the photosensitive sheet within which an image is allowed to be formed is charged with electricity and a second sheet transporting length by which the sheet is required to be further transported until the rear end of the image area is charged with electricity. A charging device is caused to turn ON when the actually transported length of the photosensitive sheet attains the calculated first sheet transporting length, and then is deactuated to turn OFF when the additionally transported length of the photosensitive sheet attains the calculated second sheet transporting length. Thus the photosensitive sheet can be charged with electricity only in its image area regardless of the overall length of the photosensitive sheet and of the position in which the photosensitive sheet is placed for exposure to the image-forming light. As a result, the margins of the photosensitive sheet, although they have not been exposed to the image-forming light or to erasing light, nevertheless attract no toner particles and so are not blackened.