Title:
画像形成装置
Document Type and Number:
Japanese Patent JP4371257
Kind Code:
B2
Abstract:
An image forming apparatus includes at least one first image carrier (3C, 3M, 3Y) that carries a chromatic color toner image formed thereon, a second image carrier (3BK) that carries a black toner image formed thereon, at least one first gear (32Y, 32M, 32C) that rotates to drive the at least one first image carrier (3C, 3M, 3Y) to rotate, a second gear (32BK) that rotates to drive the second image carrier (3BK) to rotate, and a control device (60, 54BK, 54C, 55BK, 55C) that controls respective rotation stop-positions of the at least one first gear (32Y, 32M, 32C) and the second gear (32BK). A color image is formed in a color mode by transferring the chromatic color toner image formed on the at least one first image carrier (3C, 3M, 3Y) onto a transfer material (P) and by transferring the black toner image formed on the second image carrier (3BK) onto the transfer material (P) while superimposing each other on the transfer material (P), and a black image is formed in a monochrome mode by halting the at least one first gear (32Y, 32M, 32C) and the at least one first image carrier (3Y, 3M, 3C) and by transferring the black toner image formed on the second image carrier (3BK) onto the transfer material (P). The control device (60, 54BK, 54C, 55BK, 55C) controls the at least one first gear (32Y, 32M, 32C) and the second gear (32BK) to stop rotating at positions different from rotation start-positions of the at least one first gear (32Y, 32M, 32C) and the second gear (32BK), respectively, while maintaining a predetermined phase relation between the at least one first gear (32Y, 32M, 32C) and the second gear (32BK) in the color mode, and the control device (60, 54BK, 54C, 55BK, 55C) controls the second gear (32BK) to stop rotating at a position substantially equal to a rotation start-position of the second gear (32BK) in the monochrome mode.
Inventors:
EBARA Yasuhisa
Application Number:
JP2003139355A
Publication Date:
November 25, 2009
Filing Date:
May 16, 2003
Export Citation:
Assignee:
株式会社リコー
International Classes:
G03G15/01; F16H1/06; G03G15/00; H02P8/14
Domestic Patent References:
| JP11052658A | ||||
| JP2000187428A | ||||
| JP2002062706A | ||||
| JP6317949A |
Attorney, Agent or Firm:
Norio Hoshino