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Paper feed transport mechanism
In order to feed the paper at regular intervals, there is a paper feed sensor between the pick-up roller and the feed roller, and this sensor is used to adjust the paper feed timing.
1. The paper feed motor turns ON, and feeds the first sheet of paper.
2. To prevent the next sheet from being transported, the pick-up solenoid turns ON just before the trailing edge of the first sheet passes through the pick-up roller, and the pick-up roller leaves the paper surface.
3. Just before the trailing edge of the first sheet leaves the paper feed roller, the paper feed motor turns OFF.
However, at this time, if the paper feed sensor does not detect paper (the second sheet is not transported to the paper feed sensor position), the paper feed motor does not turn OFF.
Pre-feed is performed as follows:
1. The pick-up solenoid turns OFF, and the second sheet of paper is transported to the paper feed sensor position.
2. When the trailing edge of the second sheet passes the feed roller, the paper feed motor is turned OFF. The pick-up solenoid remains OFF.
4. Just before the trailing edge of the first sheet passes the feed roller, the pick-up solenoid turns OFF. The pick-up roller is brought into contact with the paper surface.
5. When the first sheet has been transported a specified distance by the downstream transport roller, the paper feed motor turns ON to feed the second sheet.