Paper Feed/Delivery - Canon STAPLER STACKER SS-72 Service Manual

CHAPTER 2
B. Paper Feed/Delivery
1. Outline
The stapler stacker reverses the paper output from the printer when delivering it face-down. The
feed motor (M1) is a stepping motor and delivery motor (M2) is a DC motor. Clockwise/coun-
terclockwise rotation of these motors is controlled by the microcomputer (CPU) on the stapler
stacker driver PCB.
The feed path of the paper has three photo interrupters; entrance paper sensor (PI1), revers-
ing paper sensor (PI2) and delivery paper sensor (PI3), which detect the arrival or passing of the
paper.
If the paper does not reach or pass those sensors in certain time, the stapler stacker judges
it as paper jams, stops the operation and informs the option controller of the jams.
2. Face-down feed (Reversing)
When the entrance paper sensor (PI1) detects the paper output from the printer, the stapler
stacker rotates the feed motor (M1) clockwise, which rotates feed roller 1, feed roller 2 and deliv-
ery roller. When the feed roller 1 rotates, a sheet of paper is fed to the reversing unit. When PI1
detects the trailing edge of the paper, the reversing roller drive solenoid (SL7) is turned ON, and
M1 rotates the reversing roller clockwise. The paper is fed to the reversing position by this roller.
When the paper arrives at the reversing position, the reversing roller rotates counterclockwise
and feeds the paper to the feed guide. The paper is then fed by the feed roller 2 and delivery
roller 1.
3. Face-up feed
In the case of face-up delivery of the paper, when the entrance paper sensor (PI1) detects the
paper, the stapler stacker driver rotates the feed motor (M1) clockwise, which rotates the feed
roller 1, face-up feed roller and, delivery roller 1. At the same time, face-up deflector solenoid
(SL8) is turned ON, which switches the face-up deflector to the face-up side. The paper is fed
without being reversed.
4. Delivery
When the delivery paper sensor (PI3) detects the fed paper, the stapler stacker driver rotates the
delivery motor (M2) clockwise, which rotates the delivery roller 2. The paper is delivered by the
delivery roller 2.
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