Sheet Feeding Device Detachable Unit Positioning Mechanism
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Solution Overview
Problem
The existing sheet feeding devices in image forming apparatuses face issues with the detachable feeding unit accidentally being discharged, leading to deteriorated feeding performance due to rubber abrasion, which requires frequent replacement.
Innovation Solution
A sheet feeding device is designed with a driving transmission member, a storage unit, a detachable feeding unit, a separation unit, and a switching member that regulates the feeding unit's position, ensuring it remains attached during operation and prevents accidental disengagement by utilizing a one-way clutch and torque limiter to prevent slipping and abrasion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the feeding unit is made detachable for easy replacement, then the ease of operation is improved, but the reliability deteriorates due to accidental discharge
Solution Approach 1:
The feeding unit incorporates a dynamic engagement mechanism where the driven transmission member can be engaged or disengaged from the driving transmission member. During operation, the feeding unit is dynamically positioned to maintain engagement, while during replacement, it can be easily disengaged. This dynamic system resolves the contradiction by providing both secure attachment during use and easy replacement when needed.
Solution Approach 2:
The patent introduces an intermediary positioning mechanism that acts as a mediator between the detachable feeding unit and the sheet feeding device. This positioning mechanism ensures proper alignment and secure engagement of the transmission members, preventing accidental discharge while maintaining ease of replacement. The intermediary structure facilitates reliable connection without compromising operability.
2Ease of operation
If the rubber of the conveyance rotating body is used for friction-based sheet feeding, then the ease of operation is improved, but the duration of action deteriorates due to abrasion degradation
Solution Approach 1:
The feeding unit with the rubber-covered conveyance rotating body is designed as a disposable or periodically replaceable component. Instead of attempting to extend the service life of the rubber indefinitely, the system is designed to be easily replaced when the rubber degrades from friction-based sheet feeding. This approach maintains excellent sheet feeding performance throughout the rubber's service life while accepting that the component will eventually need replacement.
Data Source
AI summary
A sheet feeding device includes a driving transmission member, a feeding unit, and a switching member. The feeding unit is detachable from the sheet feeding device and includes a driven transmission member that receives a driving force from the driving transmission member, a feeding member, and a holding member that holds the driven transmission member and the feeding member. The switching member abuts the holding member and moves the feeding member between a second position and a first position lowered from the second position. When the driving force is transmitted to the driven transmission member, the feeding unit is positioned to the sheet feeding device by receiving a positioning force in an attachment direction of the feeding unit. When the driving force is not transmitted to the driven transmission member, the feeding unit is regulated by the switching member in movement in a direction opposite to the attachment direction.