Epson Stylus Photo Service Manual page 49

EPSON Stylus Photo
Papers on the ASF (auto-sheet-feeder) supplied by the user are carried to the printer inside by paper
pick up sequence. Unlike the previous models, ASF of EPSON Stylus Photo has multi feed prevention
mechanism. Following explains this function and figure below shows its mechanism.
[1. Multi feed prevention mechanism]
When the Load/Eject button is pressed, reversed rotation of PF motor is performed.
The return lever resets papers which are already in the out of stand by position and make it possible to
perform stable paper feeding by picking up the paper again.
Following explains process of multi feed prevention step by step. Refer to the figure above and confirm
its operation.
[Step 1] When the Load/Eject button is pressed or the signal of printing order is input from the PC,
PF motor rotates counterclockwise and makes the CAM rotate towards direction of 1) in the
figure above.
[Step 2] When the CAM covers the notch by the return lever, that position is considered as home
position, being monitored by ASF sensor.
[Step 3] When the CAM rotates toward 1) in the figure above, the return lever is pushed by the notch
of CAM and falls towards 2). At this time, the return lever moves to direction 3) by this
motion, and push down the pad which is waiting in the below part. At this time, friction of
pinch roller and pad will be canceled.
[Step 4] The papers which are out of stand by position by the previous paper feed motion are
returned to the paper stand by position by flip over strength of return lever. After this,
PF motor rotates clockwise and the printer goes to pick up sequence.
2-12
Figure 2-9. Multi Paper Feed Prevention Mechanism
Rev. A