Konica Minolta bizhub C658 Service Manual page 1857

bizhub C658/C558/C458/C368/C308/C258
• For details of the applicable replacement procedures for the pick-up roller, feed roller, and separation roller and the Service Mode, see "
F.7.7.1 Replacing the tray 1 feed roller, tray 1 pick-up roller, tray 1 separation
pick-up roller, tray 2 separation
11.3.3 Paper feed control (bizhub C658/C558/C458)
(1) Pick-up control
• The paper feed motor turns ON when the predetermined amount of time elapses after the print start signal is input. Drive power transfers
to tray 1 and tray 2 via forward and reverse operation of the paper feed motor.
• Drive power from the paper feed motor transfers to the tray 1 pick-up roller and feed roller when the paper feed motor is turned ON.
Paper is picked up and fed by the rotation of the rollers.
• Drive power from the paper feed motor transfers to the tray 2 pick-up roller and feed roller when the tray 2 paper feed clutch is turned
ON. Paper is picked up and fed by the rotation of the rollers.
(2) Separation control
• The separation roller is pressed up against the feed roller by the pressure of a spring and an acting pressure generated from torque of
the torque limiter.
• The acting pressure of the feed roller, separation roller, and torque limiter serves as the limit torque for preventing double feed.
• When there is no sheet of paper or only one sheet of paper between the separation roller and feed roller, the limit torque is exceeded and
the separation roller follows the rotation of the feed roller.
• If there are two or more sheets of paper between the separation roller and feed roller, the limit torque is greater than the friction force of
the paper, so that the separation roller is not rotated.
• The separation roller causes the lower sheet of paper in contact with the separator roller to be pushed backward in the direction of the
tray, so that the lower sheet of paper is properly separated.
• Only the upper paper contacting the feed roller is conveyed to the registration section.
[4]
[3]
[1] Feed roller
[3] Paper
(3) Periodical replacement parts
• The pick-up roller, feed roller, and separation roller are periodical replacement parts. These three rollers must be replaced with new ones
at the same time.
• None of the pick-up roller, feed roller, and separation roller is provided with a new article detection mechanism. When the three rollers
are replaced with new ones, the "1st." or "2nd." counter must be reset from [Service Mode] -> [Counter] -> [Life].
• The number of times tray 1/tray 2 has been subjected to paper feed operations can be checked with the "1st./2nd." counter of the Service
Mode.
Periodical replacement cycle
[1] Pick-up roller
O THEORY OF OPERATION bizhub C658/C558/C458/C368/C308/C258 > 11. PAPER
roller."
[1]
[2]
[1]
roller" and " F.7.7.2 Replacing the tray 2 feed roller, tray 2
[2] Separation roller
[4] Pick-up roller
Paper feed operations 300,000 times
[2]
[2] Feed roller, Separation roller
O-82
FEED SECTION