Medium Conveying Device With Timed Pickup Roller Interruption
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Solution Overview
Problem
In medium conveying devices, particularly those configured to continuously convey multiple media, there is a risk of misalignment and jamming when a second medium is conveyed before the trailing end of the first medium passes through the nip point between the separation and retard rollers.
Innovation Solution
A transmission interruption mechanism is introduced in the power transmission mechanism to pause power delivery to the pickup roller after it conveys the trailing end of the first medium, ensuring the second medium does not enter the nip point until the first medium has cleared it, using a rotating member that abuts and separates from an abutment portion to interrupt power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pickup roller continuously conveys media without interruption, then the conveying speed and productivity are improved, but the second medium may be conveyed before the first medium clears the nip point causing misalignment and jamming
Solution Approach 1:
The power transmission mechanism uses periodic engagement and disengagement of the transmission interruption mechanism to create intermittent conveying action. The pickup roller rotates continuously during power transmission, but the transmission interruption mechanism periodically interrupts this rotation at specific timing (when the trailing end of the first medium passes the pickup roller), creating a rhythmic conveyance pattern that prevents jamming while maintaining productivity.
Solution Approach 2:
The transmission interruption mechanism is designed to interrupt power transmission at a predetermined timing - specifically when the trailing end of the first medium passes the pickup roller. This preliminary interruption ensures that the pickup roller stops rotating before the second medium reaches the nip point, preventing misalignment and jamming while maintaining efficient conveying of the first medium.
2Reliability
If the pickup roller is stopped to prevent the second medium from entering the nip point prematurely, then conveyance accuracy is improved, but the conveying efficiency and productivity deteriorate
Solution Approach 1:
Instead of continuous stopping, the system uses periodic interruption of power transmission only at critical moments. The pickup roller rotates freely during most of the conveyance cycle, interrupting power transmission only when the trailing end of the first medium passes it. This periodic action maintains high conveying efficiency while ensuring accuracy at critical transition points.
Solution Approach 2:
The transmission interruption mechanism is automatically triggered by the position of the medium itself - specifically when the trailing end passes the pickup roller. The mechanism uses the medium's own movement to trigger the interruption, eliminating the need for external sensors or control systems to detect medium position and timing the stop accordingly.
3Reliability
If the transmission interruption mechanism interrupts power to the pickup roller at the right timing, then jamming is prevented, but the device complexity increases
Solution Approach 1:
The transmission interruption mechanism is merged with the existing power transmission mechanism for the pickup roller. Rather than adding a separate control system or sensor-based interruption device, the patent integrates the interruption function into the mechanical power transmission path itself, using the existing gears and transmission components to achieve the timing function.
Solution Approach 2:
The transmission interruption mechanism automatically triggers based on the physical position of the medium - specifically when the trailing end passes the pickup roller. This self-triggering mechanism eliminates the need for external sensors, controllers, or complex timing systems, reducing overall device complexity while maintaining reliable jamming prevention.
Data Source
AI summary
A medium conveying device includes an accommodation unit that accommodates a plurality of media including a first medium and a second medium, a pickup roller, a retard roller, a separation roller, a conveyance roller, a drive source that generates power to rotate the rollers, a power transmission mechanism that transmits power to the pickup roller and the separation roller, and a transmission interruption mechanism that interrupts transmission of power to the pickup roller during transmission of power to the separation roller. The transmission interruption mechanism is configured to interrupt the transmission of power to the pickup roller after the pickup roller conveys the trailing end of the first medium in a conveying direction.