e-STUDIO281c/351c/451c © 2005 - 2008 TOSHIBA TEC CORPORATION All rights reserved
DEVELOPER UNIT
12 - 8
12.4.4 Black developer unit lifting mechanism
1) General descriptions
In the black developer unit, the drive from the developer motor (M11) is transmitted to cam with the
black developer lifting clutch (CLT11) 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 con-
tacts with the drum instead.
Black developer contact position detection sensor (S11) detects whether the black developer unit is
at the developing position or at the escape position.
2) Construction
- Black developer lifting clutch (CLT11)
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 (S11)
Detects whether the black developer unit is at the contact position or release position. This sen-
sor detects the shield plate. “L” is output when contacting and “H” is output when releasing.
- Black developer contact timing detection sensor (S12)
Controls the black developer lifting clutch (CLT11). This sensor outputs reference timing signals
for controlling ON/OFF of the black developer lifting clutch (CLT11). “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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