Image Recording Apparatus Feed Timing Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In image recording apparatuses, the simultaneous feeding of subsequent sheets can cause vibrations and affect the quality of the image recorded on preceding sheets, especially when the feed roller starts feeding the next sheet immediately after the trailing end of the preceding sheet passes through the conveyance rollers.
Innovation Solution
The apparatus includes a controller that adjusts the feed timing and velocity of subsequent sheets to prevent them from contacting the conveyance rollers during the recording process of the preceding sheet, by implementing different feed conditions such as delaying the start of feeding or reducing the feed velocity, thereby minimizing vibrations and maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the feed roller starts feeding the subsequent sheet immediately after the trailing end of the preceding sheet passes through the conveyance rollers, then the productivity is improved, but the subsequent sheet contacts the conveyance rollers during recording, causing vibrations that deteriorate the manufacturing precision of the recorded image
Solution Approach 1:
The controller determines in advance whether the subsequent sheet will contact the conveyance rollers during recording by calculating the timing based on sheet length, feed velocity, and conveyance velocity. If contact is predicted, the feeding is delayed or velocity is reduced before the sheet reaches the conveyance rollers, preventing vibration during the recording process
2Productivity
If the feed roller feeds the subsequent sheet at high velocity, then the productivity is improved, but the sheet contacts the conveyance rollers during recording, causing vibrations that worsen the manufacturing precision
Solution Approach 1:
The feed velocity of the subsequent sheet is dynamically adjusted based on the timing of conveyance and recording. When the sheet is being conveyed, high velocity is used to maintain productivity. When the sheet approaches the conveyance rollers during recording, the velocity is reduced to prevent contact and vibration, creating a dynamic velocity profile that balances both productivity and precision
Data Source
AI summary
A controller determines whether, in a case where feeding of a subsequent sheet is performed in a first feed condition, a subsequent sheet contacts conveyance rollers during recording on a preceding sheet, the first feed condition being that feeding of the subsequent sheet is started at a first timing before recording on the preceding sheet ends and that the subsequent sheet is fed at a first velocity, and in response to determining that the subsequent sheet contacts the conveyance rollers during recording on the preceding sheet, controls the feed roller to perform feeding of the subsequent sheet in a second feed condition or a third feed condition, the second feed condition being that the feeding of the subsequent sheet is started at a second timing later than the first timing, the third feed condition being that the subsequent sheet is fed at a second velocity lower than the first velocity.