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:
Nov. 18, 1997
Filed:
Nov. 17, 1995
Ryuji Wataki, Nara-ken, JP;
Shigeo Fujita, Moriguchi, JP;
Mita Industrial Co., Ltd., , JP;
Abstract
An image-transfer and sheet-separating apparatus transfers an image toner-developed from a positive latent image and retained on a photoconductor drum onto a copy sheet, and subsequently separates the sheet from the photoconductor drum. A bias voltage including a sheet peel-separating AC voltage superimposed on an image-transferring DC bias voltage is applied to a transfer roller which presses on the photoconductor drum. A post image-transfer charge-stripping element removes charge from the copy sheet and is disposed in a portion of the sheet-transport stream forward of a nipping position at which the transfer roller presses against the photoconductor drum. Thus, charge remaining on the copy sheet is discharged, ensuring high efficiency in image transfer and accordingly reducing the incidence of failure in the separation of the copy sheet from the photoconductor drum. The bias voltage is within the range of 500 V and 2000 V and specifically, the AC and DC biases are within the range of 1000 V and 1500 V. In addition, the transfer roller is moved toward or away from the photoconductor depending on the thickness of the copy sheet.