Konica Minolta bizhub C658 Service Manual page 1963

bizhub C658/C558/C458/C368/C308/C258
[1] Adjust the document width guide plates (center alignment)
[3] Original (standard mode)
[5] Original with narrow width (mixed original mode)
(1) Detecting the width of the original
• The width of the original is set on the document feed tray will be detected by the document width size sensor.
• A variable resistor is incorporated in the document width size sensor. Its resistance value varies in association with the movement of the
document width guide.
• The original is to be loaded in the original feed tray by aligning it with reference to the center of the document feed tray in the standard
mode. In the mixed original mode, the original is aligned to the rear side of the document width guide plate.
(2) Detecting the length of the original
• The length of the original is set on the document feed tray will be detected by the document length size sensors/1 and /2.
• The document length size sensor/1 is a transmission type, while document length size sensor/2 is a reflection type. The document length
size sensor/1 is detected by two actuators, that is, actuator/1 and actuator/2.
• When the document feed tray is not loaded with any originals, document length size sensor/1 is blocked. When an original is loaded and
only actuator/1 is pressed, document length size sensor/1 is unblocked. When both actuator/1 and actuator/2 are pressed, a blocked
document length size sensor/1 is detected by actuator/2.
[1]
[1] Document length size sensor/1 (PS6)
[3] Document length size sensor/2 (PS7)
(3) Detecting the width of the original (in the mixed original/AMS mode)
• In the mixed original/AMS mode, no width is determined on the document feed tray; rather, the width is detected while the originals are
being fed. Three mixed original sensors are disposed at positions immediately after the document feed section, functioning to detect the
width of the original.
(4) Detecting the length of the original (in the mixed original/AMS mode)
• In the mixed original/AMS mode, no length is determined on the document feed tray; rather, the length of the original is calculated and
determined based on the period of time during which the document reading sensor remains activated.
(5) Document feed tray size detection
• The original size is determined by the combination of the results of detection made of the width and length of the original.
Document length size sensor/2 (PS7)
Document length size sensor/1 (PS6)
Document width size 114.5
sensor (VR1)
136
163
190.6
236.5
266.2
286.2
(307)
3.1.3 Pick-up roller up/down control
(1) Up control
• When a job is completed, the document feed motor starts rotating backward. Then, the swing arm mounted on the same shaft as the
document feed roller is rotated backward to thereby raise the original pick-up roller to the standby position.
• The document pick-up roller is fixed at the raised position by a torque limiter of the paper drive section.
• When the swing arm is raised to the standby position, the document stopper is lowered by its own weight and fixed by the lock pawl of
the swing arm. The document stopper is unlocked when the swing arm lowers.
• The document stopper has two functions: one, to align the leading edges of the originals loaded in the standby state; and, two, to prevent
the leading edge of the original from advancing over the pick-up position into the feed section.
[3]
[2]
OFF
Blocked
Postcard
B6S
A5S
B5S
A5
B5
Letter
A4
PB THEORY OF OPERATION DF-629 > 3. OPERATION
[2] Document width guide plates
[4] Align the original with narrow width with the rear side of
the document width guide plates (rear alignment)
[6] Original with wide width (mixed original mode)
[4]
[2] Actuator/1
[4] Actuator/2
OFF
Unblocked
B5S
B5S
B5S
B5S
Letter S
B4
Ledger
A3
PB-6
Reflector Reflector
Unblocked Blocked
A4S A3
A4S A3
A4S A3
A4S A3
A4S Foolscap
B4 B4
Ledger Ledger
A3 A3