Feed Roller One-Way Clutch for Reverse Sheet Return Control
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Solution Overview
Problem
Conventional medium transport devices face challenges in appropriately returning subsequent media to the placement section without causing them to be blown off with great force, due to the rotational forces acting on the retard roller and feed roller, which can lead to media misalignment and jamming.
Innovation Solution
A medium transport device equipped with a drive mechanism that includes a feed roller, a separation roller, and a one-way clutch system that allows the feed roller to rotate in both forward and reverse directions, controlled by a one-way clutch section to manage the direction of media transport and prevent media from being blown off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electromagnetic clutch is turned off to set the feed roller in a freely rotatable state and the retard roller is rotated to return the subsequent medium, then the subsequent medium can be returned to the placement section side, but the subsequent medium may be blown off to the placement section side with great force due to spring back of the torque limiter
Solution Approach 1:
A one-way clutch is introduced as an intermediary device between the motor and the feed roller. This one-way clutch selectively transmits rotational force in the forward direction while allowing free rotation in the reverse direction, thereby mediating the interaction between the motor-driven feed roller and the spring-loaded retard roller. This resolves the contradiction by enabling the feed roller to rotate freely in reverse (allowing medium return) while preventing excessive reverse rotation force (preventing medium blow-off).
2Object-affected harmful factors
If a one way clutch is provided in the conventional medium transport device, then the subsequent medium can be suppressed from being blown off, but it becomes difficult to appropriately return the subsequent medium to the placement section side
Solution Approach 1:
The one-way clutch is configured to automatically switch between locked and unlocked states based on the direction of rotational force. When the feed roller needs to rotate forward, the one-way clutch locks to transmit motor force. When the feed roller needs to rotate reverse, the one-way clutch automatically unlocks, allowing free rotation without external control. This self-service mechanism resolves the contradiction by providing both blow-off suppression (through automatic locking in forward direction) and medium return capability (through automatic unlocking in reverse direction).
Data Source
AI summary
A medium transport device includes a feed roller, a separation roller that nips the medium P together with the feed roller and separates a plurality of stacked medium, a drive section that generates a driving force, a one way clutch section provided in a transmission path for transmitting the driving force to the feed roller, wherein the one way clutch section is configured to switch between an allowed state in which the feed roller allowed to rotate in a rotation direction in which the medium are moved in a reverse feed direction and a restricted state in which this is not allowed and it is causes the one way clutch section to the allowed state, and that is configured to rotate the separation roller in the rotation direction in which the medium moves in the reverse feed direction.