Konica Minolta bizhub C658 Service Manual page 1944

bizhub C658/C558/C458/C368/C308/C258
3.3.4 Original take-up control
• The take-up motor provides the drive for original take-up operations.
• The drive from the take-up motor is transmitted to the pick-up roller and feed roller when the take-up clutch is energized. The original is
picked up and fed in by the rotation of the rollers.
• The original picked up and fed in is transported onto the registration roller.
[9]
[8]
[7]
[6]
[5]
[4]
[1] Take-up motor (M1)
[3] Separation roller
[5] Registration roller
[7] Feed roller
[9] Take-up clutch (CL1)
3.3.5 Double feed detection (UK-501)
• With the optional UK-501 being installed, it is possible to detect originals double feed.
• At double feed detection, the passing originals come in contact with ultrasonic waves. Depending on the amount of unblocked ultrasonic
waves, it can be determined whether originals are double feed.
• Double feed detection uses a detection board that is configured with one pair of a receiver and a transmitter.
[4]
[3]
[1] Multi feed detection board/2 (receiver) (MFDB/2)
[3] Multi feed detection board/1 (transmitter) (MFDB/1)
(1) Double feed detection control
• Originals come into contact with ultrasonic waves that are transmitted from the multi feed detection board/1 (transmitter). The ultrasonic
waves are received on the multi feed detection board/2 (receiver).
• The ultrasonic waves attenuate due to the air layer between originals when originals are double feed.
• The voltage at the receiver is checked. A determination of original double feed is made if the voltage is the same as or less than a
predetermined value.
• The following lists the type of originals that can be detected for double feed.
• Originals with weight of 35 to 210 g/m
occurs.
PA THEORY OF OPERATION DUAL SCAN DOCUMENT FEEDER/SP-501/UK-501
[1]
[2]
[3]
[2]
[4]
[6]
[8]
-
[1]
[2]
[2]
[4]
2
(9 5/16 to 55 7/8 lb). Other types of originals may not be detected properly when double feed
PA-6
(bizhub C658/C558/C458) > 3. PAPER FEED SECTION
Pick-up roller
After separate sensor (PS4)
Registration sensor (PS5)
Document feed sensor (PS21)
-
Feed roller
Registration roller