Konica Minolta bizhub C658 Service Manual page 1981

bizhub C658/C558/C458/C368/C308/C258
Document length sensor/2 (PS9)
Document length sensor/1 (PS8)
Document width 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 document 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.
[1]
[2]
[1] Swing arm (standby position)
[3] Swing arm (feed position)
(2) Down control
• When the start key is pressed, the document feed motor starts rotating forward. The rotation shaft of the swing arm mounted on the
same shaft as the document feed roller is rotated forward, so that the document pick-up roller is lowered to the feed position.
• The document stopper is unlocked when the swing arm lowers.
3.1.4 Document feed/separation control
• When the start key is pressed, the document feed motor starts rotating forward, so that the document feed roller rotates forward.
• The rotation shaft of the swing arm mounted on the same shaft as the document feed roller is rotated forward, so that the document pick-up
roller is lowered to the feed position. The document pick-up roller is rotated by a drive belt to thereby feed the original onto the document
feed roller.
(1) Separation/feed operation
1. The document separation roller is pressed up against, and driven by, the document feed roller. A torque limiter is mounted on the shaft of
the document separation roller.
2. The acting pressure of the document feed roller/document separation roller/torque limiter serves as the limit torque for preventing double
feed.
3. When there is no original or only one sheet of original between the document separation roller and the document feed roller, the limit
torque is exceeded and the document separation roller follows the rotation of the document feed roller.
4. If there are two or more sheets of original between the document separation roller and the document feed roller, the limit torque is greater
than the friction force of the original, so that the document separation roller stops rotating.
5. Because of the stationary document separation roller, the lower sheet of original in contact with the document separation roller is not fed
in, so that the first sheet of original is original separated from the second sheet of original.
OFF
Blocked
Postcard
B6S
A5S
B5S
A5
B5
Letter
A4
[3]
[4]
PC-7
PC THEORY OF OPERATION DF-704 > 3. OPERATION
OFF Reflector
Unblocked Unblocked
B5S A4S
B5S A4S
B5S A4S
B5S A4S
Letter S A4S
B4 B4
Ledger Ledger
A3 A3
[2] Document stopper
[4] Document pick-up roller
Reflector
Blocked
A3
A3
A3
A3
Foolscap
B4
Ledger
A3