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:
Feb. 24, 2004
Filed:
Jan. 04, 2001
Naoyuki Iimura, Ibaraki-ken, JP;
Hideharu Yoneoka, Ibaraki-ken, JP;
Riso Kagaku Corporation, Tokyo, JP;
Abstract
A backlash correction device of this invention has a motor, a gear transmitting a moving force from the motor to a paper feed base, a spring urging the paper feed base to one of forward and backward movement directions of the paper feed base using an urging force, and a controller. (1) If the paper feed base is moved in an opposite direction to an urging direction of the spring, the controller drives the motor in a movement direction of the paper feed base by a predetermined movement quantity. (2) If the paper feed base is moved in a same direction as the urging direction of the spring, the controller (2-1) drives the motor in a movement direction of the paper feed base by a movement quantity which is the sum of the predetermined movement quantity and a correction quantity equal to or greater than a maximum backlash quantity, and (2-2) then drives the motor in an opposite direction by the correction quantity.