Backlash correction device and backlash correction method

Patent 6695505 Issued on February 24, 2004. Estimated Expiration Date:

January 4, 2021. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Bi-directional record material feed apparatus
Patent #: 4269522
Issued on: 05/26/1981
Inventor: Levinson , et al.

Paper feeder
Patent #: 4930916
Issued on: 06/05/1990
Inventor: Fujiwara

Apparatus for conveying paper in a printer
Patent #: 5308176
Issued on: 05/03/1994
Inventor: Yamaguchi

Sheet feeding apparatus
Patent #: 6183151
Issued on: 02/06/2001
Inventor: Kono

Image forming apparatus for preventing paper jam during continuous paper returning operation Patent #: 6244767
Issued on: 06/12/2001
Inventor: Jung

Inventors

Assignee

Riso Kagaku Corporation

Application

No. 09/753687 filed on 01/04/2001

US Classes:

400/636.2, Including intermediate drive means (e.g., gears) connecting feed-roller to platen74/409, Backlash take-up74/440Backlash take-up

Examiners

Primary: Hirshfeld, Andrew H.
Assistant: Nguyen, Hiep T.

Attorney, Agent or Firm

International Classes

F16H 57/12 (20060101)
B41J 11/42 (20060101)
B41J 13/00 (20060101)
F16H 57/00 (20060101)

Foreign Application Priority Data

2000-01-13 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.