Conveyance Guide Retention for Sheet Jam Access
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Solution Overview
Problem
Existing sheet feeding apparatuses face issues where the conveyance guide leans against sheets when the door is opened, potentially damaging them and interfering with jammed sheet treatment, due to the guide being retained in a state that causes it to open automatically.
Innovation Solution
A sheet conveyance apparatus with a movably arranged conveyance guide and door, featuring first and second retaining portions that securely lock the guide in a closed position when the door is closed, and release it when the door is opened, allowing for safe operation and easy access to jammed sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the conveyance guide is retained in a state leaning against the door when the door is closed, then the door can push the conveyance guide to a closed state, but when the door is opened the conveyance guide opens automatically and may lean against the sheet causing damage
Solution Approach 1:
The first retaining portion keeps the conveyance guide retained at the guide closed position in advance before the door is opened. This preliminary retention prevents the guide from opening automatically when the door is opened, thereby preventing it from leaning against and damaging sheets in the conveyance path.
2Device complexity
If the conveyance guide is retained in a state leaning against the door, then the door structure is simple, but the conveyance guide may interfere with the treating of jammed sheets
Solution Approach 1:
The second retaining portion releases the retention of the conveyance guide at the guide closed position in advance before the door is opened. This allows the conveyance guide to be moved to the guide open position easily, providing access to treat jammed sheets without interference from the guide structure.
3Reliability
If the conveyance guide is retained at the guide closed position when the door is closed, then sheet conveyance is stable, but the guide cannot be accessed for maintenance or adjustment
Solution Approach 1:
The second retaining portion releases the retention of the conveyance guide in advance before the door is opened, enabling the guide to be moved to the open position for maintenance or adjustment. The first retaining portion then re-retains the guide at the closed position after maintenance, ensuring stability during operation while allowing access when needed.
Data Source
AI summary
A sheet conveyance apparatus includes a sheet conveyor, a conveyance guide, and a door arranged movably between an open and closed position and configured to press the conveyance guide to move it from a guide open position to a guide closed position. A first retainer engages the conveyance guide so as to retain the conveyance guide, and a second retainer disposed in a position different from the first retainer engages the conveyance guide so as to retain the conveyance guide. When the door is positioned at the closed position, the first and second retainers retain, in different positions, the conveyance guide at the guide closed position, and when the door is positioned at the open position, the first retainer maintains the conveyance guide at the guide closed position and the second retainer releases a retention of the conveyance guide at the guide closed position.