Image Forming Apparatus Conveyance Guide for Transfer Unit Maintenance
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Solution Overview
Problem
In existing image forming apparatuses, the intermediate transfer unit interferes with the fixing unit during insertion or removal due to the presence of an entry restriction member, requiring manual intervention and potential forgetfulness in reattaching the member, complicating maintenance and operation.
Innovation Solution
The image forming apparatus includes a retractable conveyance guide that moves between a guide position and a retracted position, allowing the intermediate transfer unit to be attached or detached without interference, simplifying maintenance by ensuring smooth operation and reducing the risk of forgetting to reattach the entry restriction member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an entry restriction member is provided between the intermediate transfer unit and the fixing unit, then the recording medium entry is restricted, but the intermediate transfer unit cannot be easily attached or detached due to interference
Solution Approach 1:
The entry restriction member is designed to be movable between a first position where it restricts recording medium entry and a second position where it allows attachment/detachment operation. The member can be shifted along the conveying direction by the intermediate transfer unit's movement, transitioning between these positions dynamically based on operational needs.
Solution Approach 2:
The entry restriction function is separated from the attachment/detachment path. The entry restriction member is positioned such that it only interferes with recording medium entry, while the intermediate transfer unit can be attached or detached by moving it in a different direction (upward separation direction) that bypasses the restriction member.
2Ease of repair
If the intermediate transfer unit is made detachable for maintenance, then ease of repair is improved, but the entry restriction member may be forgotten to be reattached
Solution Approach 1:
The entry restriction member is designed to be automatically repositioned by the intermediate transfer unit's own movement. When the intermediate transfer unit is reattached, its movement automatically shifts the entry restriction member to the first position, eliminating the need for manual reattachment operations and preventing forgotten reattachment.
Solution Approach 2:
The entry restriction member is pre-positioned in the first position (restricting recording medium entry) before the intermediate transfer unit is attached. This preliminary positioning ensures that the restriction function is already active and does not require additional manual intervention after reattachment.
3Device complexity
If the conveyance guide is fixed in position, then structural simplicity is maintained, but it interferes with intermediate transfer unit attachment/detachment
Solution Approach 1:
The conveyance guide is designed to be movable between a guide position where it guides recording medium conveyance and a retracted position where it does not interfere with attachment/detachment. The guide can shift positions based on whether recording medium conveyance or intermediate transfer unit maintenance is the current operation.
Solution Approach 2:
The conveyance guide moves in a direction perpendicular to the intermediate transfer unit's attachment/detachment path. By retraction in a different dimension, the guide avoids interfering with the attachment/detachment operation while maintaining its conveyance guidance function when needed.
Data Source
AI summary
An image forming apparatus includes a photoreceptor that bears a toner image, an intermediate transfer unit that receives the toner image from the photoreceptor and bears the toner image, a transfer section that transfers the toner image borne by the intermediate transfer unit to a recording medium, a fixing section that fixes the toner image to the recording medium, and a conveyance guide that is provided between the transfer section and the fixing section, and guides the recording medium to be conveyed from the transfer section toward the fixing section, wherein the intermediate transfer unit is attachable to and detachable from an apparatus body, and during attachment or detachment of the intermediate transfer unit, the conveyance guide is retractable to a retracted position where the conveyance guide does not interfere with attachment or detachment of the intermediate transfer unit.