Pickup And Feed Operations; Reversal Operation - Canon imageRUNNER 1750 Series Service Manual

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Technical Explanation > Original Exposure and Feed System > Control of ADF > Reversal Operation

■ Pickup and Feed Operations

The pickup unit consists of two rollers, a pickup roller and a feed roller.
When the Start key is turned on (the original pickup signal is input), the delivery reversal
motor (M12) turns in the normal direction, the pickup solenoid (SL5) turns off to lower the
pickup unit, and then the pickup roller and feed roller turn to pick up and feed the original.
A shutter and a separation pad are provided to prevent double feed of originals during pickup
operation. The separation pad is used to separate the original.
When the original arriving at the registration roller loops, the pickup solenoid (SL5) turns on to
raise the pickup unit.
Then, the registration solenoid (SL4) turns on and the feed motor (M11) turns to rotate the
registration roller, feeding the original.
Pickup solenoid (SL5)
Delivery reversal motor (M12)
2 Technical Explanation > Original Exposure and Feed System > Control of ADF > Reversal Operation
Pickup roller
Original
Shutter
Feed roller
Separation pad
Shutter
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■ Reversal Operation

Reversal operation is performed in the duplex printing mode or various sized originals printing
mode.
There are two types of reversal operations: upstream reversal feed operation and
downstream reversal feed operation.
Either type of reversal feed operation is selected according to the following conditions:
1) Upstream reversal feed operation
• When the front side is read in the duplex printing mode
• When the front side is read in the various sized originals printing mode
2) Downstream reversal feed operation
• When the back side is read in the duplex printing mode
• When the back side is read in the various sized originals printing mode
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