Movable Drive Gear Engagement for Toner Unit Attachment
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Solution Overview
Problem
Existing image forming apparatuses face issues with shallow engagement between the apparatus-body drive gear and the unit drive gear, leading to potential driving failures and abnormal noise during toner container attachment and detachment, which can result in image defects and reduced operability.
Innovation Solution
The apparatus-body drive gear engages with the unit drive gear on the downstream side in the attachment direction, allowing the gears to move to a retracted position during attachment and detachment operations to prevent interference and ensure proper engagement, thereby reducing the likelihood of shallow engagement and associated issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the apparatus-body drive gear engages with the unit drive gear during attachment operation, then the driving force can be transmitted to the rotary body, but the gear may interfere with the attachment operation and cause shallow engagement
Solution Approach 1:
The patent makes the apparatus-body drive gear movable along the attachment direction, allowing it to dynamically change position between a retracted state (during attachment/detachment) and an engaged state (during operation). This dynamic positioning resolves the contradiction by temporarily removing the gear from the attachment path to enable easy attachment operations, then engaging it to ensure reliable driving force transmission.
2Reliability
If the apparatus-body drive gear is positioned to engage with the unit drive gear, then proper driving transmission is achieved, but it may cause abnormal noise and image defects
Solution Approach 1:
The movable gear configuration allows the system to dynamically transition between engagement states. When properly engaged during operation, reliable driving transmission is achieved. When disengaged during attachment/detachment, abnormal noise and image defects are prevented. This resolves the contradiction by controlling the timing and state of gear engagement.
Data Source
AI summary
An image forming apparatus includes an apparatus body and a detachable unit to be attached to the apparatus body in an attachment direction and detached from the apparatus body in a detachment direction. The detachable unit includes a rotary body and a unit drive gear. The apparatus body includes an apparatus-body drive gear to engage with the unit drive gear of the detachable unit attached in the apparatus body, at an engageable position on a downstream side of the apparatus-body drive gear in the attachment direction. One or each of the unit drive gear and the apparatus-body drive gear moves to a retracted position at which the one or each of the unit drive gear and the apparatus-body drive gear does not engage with the other of the unit drive gear and the apparatus-body drive gear and does not interfere with attachment and detachment operations of the detachable unit.