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. 30, 1993
Filed:
Jan. 21, 1993
Yoshifumi Maitani, Yamatokoriyama, JP;
Naoyuki Kamei, Yamatokoriyama, JP;
Yoshiaki Ibuchi, Nara, JP;
Mitsuru Ogura, Nara, JP;
Hidenori Ohnishi, Yamatokoriyama, JP;
Minoru Tomiyori, Yamatokoriyama, JP;
Yasushi Matsutomo, Yamatokoriyama, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A document platen driving device is provided with an endless gear connected to a document platen, whereon a document is placed, which reciprocates. A sun gear is secured to a fixed station within a space surrounded by the endless rack, and a planetary gear meshing with the endless rack and with the sun gear is also provided within the space. The planetary gear is a double gear composed of a large gear and a small gear having different pitch circle diameters. It is arranged such that the document platen is moved forward by meshing the small gear with the endless rack, and moved backward by meshing the large gear with the endless rack. In this arrangement, the backward moving speed of the document platen can be set faster than the forward moving speed, thereby permitting a reduction of the entire time required for a copying process, especially for a successive copying process.