Sheet Conveyance Alignment With Pre-Feed Detection
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Solution Overview
Problem
Existing image forming apparatuses using side registration systems face issues with varying sheet conveyance speeds and misalignment of sheets with images due to deviations in the position of the abutment member, leading to potential sheet jams and reduced productivity.
Innovation Solution
A sheet conveyance apparatus with a rotary member pair, movement portion, detection portion, and abutment member, which adjusts the position of the rotary member pair in the width direction based on detection results to stabilize the sheet's downstream end before oblique conveyance, ensuring precise alignment with the abutment surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the position of the abutment member is moved to improve alignment with the image, then the alignment between the sheet and image is improved, but the distance between the sheet end portion and the abutment member becomes deviated, causing sheet conveyance speed variation and potential sheet jams
Solution Approach 1:
The system performs preliminary detection of the sheet end position using a detection portion before the sheet reaches the oblique conveyance portion. Based on this detection, the rotary member pair is pre-positioned in the width direction to ensure the sheet end will be at the correct position when it abuts the abutment member, preventing both misalignment and conveyance speed variation
Solution Approach 2:
The detection portion continuously monitors the sheet end position and provides feedback to the control system. The control system adjusts the rotary member pair position based on this feedback to maintain the sheet end at a set position, ensuring both alignment precision and conveyance stability even when the abutment member position is adjusted
2Reliability
If the rotary member pair is positioned to stabilize the sheet end position before oblique conveyance, then the sheet conveyance speed is stabilized and sheet jams are reduced, but the alignment between the sheet and image may be compromised
Solution Approach 1:
The system performs preliminary detection of the sheet end position using a detection portion before the sheet reaches the oblique conveyance portion. Based on this detection, the rotary member pair is pre-positioned in the width direction to ensure the sheet end will be at the correct position when it abuts the abutment member, preventing both misalignment and conveyance speed variation
Solution Approach 2:
The detection portion continuously monitors the sheet end position and provides feedback to the control system. The control system adjusts the rotary member pair position based on this feedback to maintain the sheet end at a set position, ensuring both alignment precision and conveyance stability even when the abutment member position is adjusted
Data Source
AI summary
A sheet conveyance apparatus includes a rotary member pair, a movement portion, a detection portion, an abutment member, an oblique conveyance portion, and a controller configured to, on a basis of a detection result of the detection portion, move the rotary member pair in a width direction by the movement portion such that a position, in the width direction, of the downstream end of the sheet is a set position in a state in which the rotary member pair is nipping the sheet and before the sheet reaches the oblique conveyance portion. The controller is configured to execute a correction mode of correcting the set position.