Toshiba 4511, 3511 manual Black developer unit lifting mechanism

12.5.4Black developer unit lifting mechanism

(1) General descriptions

In the black developer unit, the drive from the developer motor is transmitted to cam with the black developer lifting clutch and this promotes the lifting movement of the black developer unit to contact or release against the photoconductive drum. When developing color images, (Y, M or C), the black developer unit escapes contact with the drum. When developing black images each color developer unit releases from the drum by rotating its revolver and the black developer unit contacts with the drum instead.

Black developer contact position detection sensor detects whether the black developer unit is at the developing position or at the escape position.

(2)Construction

•Black developer lifting clutch

An electromagnetic clutch contacts or releases the black developer unit against the drum. The clutch movement lifts the developer unit up and down by rotating the cam.

•Black developer contact position detection sensor

Detects whether the black developer unit is at the contact position or release position. This sensor detects the shield plate. “L” is output when contacting and “H” is output when releasing.

•Black developer contact timing detection sensor

Controls the black developer lifting clutch. This sensor outputs reference timing signals for control- ling ON/OFF of the black developer lifting clutch. “H” is output when releasing and “L” is output when contacting. The sensor controls the power supply to turn OFF the clutch after detecting the output alteration (“L” to “H” or “H” to “L”).

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November 2003 © TOSHIBA TEC 12 - 9 e-STUDIO3511/4511 DEVELOPER UNIT