Multiple-feed prevention mechanism
The paper-separation roller is used for each HCI cassette to prevent multiple-feeds.
Multiple-feed prevention enables the HCI paper separation roller to rotate in the same direction as the
HCI feed roller. The paper-separation roller is imparted with a rotational force, which is transmitted
through the torque limiter. If a multiple-feed occurs, the second paper is pushed back to the HCI cassette
and only the top sheet of paper is fed into the device.
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Normal feed: The HCI paper-separation roller is imparted with a rotational force in the same
direction as the HCI feed roller. Because the HCI paper-separation roller touches the HCI feed
roller, driving torque from the HCI feed roller triggers the torque limiter. The torque limiter shuts
down the rotational force from the HCI paper-separation roller. This causes the HCI paper-
separation roller to follow the rotational direction of the HCI feed roller, in the opposite direction.
When the paper is not multiple-fed, the driving force from the HCI feed roller transmits through the
single paper and allows the HCI paper-separation roller to rotate in the opposite direction.
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Multiple feed: The rotational force of the HCI feed roller that is transmitted to the HCI paper-
separation roller becomes weak because of a low friction between sheets. The torque limiter does
not function, and the HCI paper-separation roller rotates in the direction of the driver gear.
Consequently, the multiple-fed paper is removed and pushed back to the HCI cassette.
ENWW 1 x 500-sheet and 3 x 500-sheet high-capacity input feeder 145
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