Paper Supply Flexure Control for Print Vibrations
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Solution Overview
Problem
Inkjet printing apparatuses experience vibrations and errors in printed images due to back tension and flexure issues during paper supply operations, which are not adequately addressed by existing assist control methods.
Innovation Solution
A paper supply apparatus with a primary paper supply roller and resist rollers that execute assist control to maintain flexure in the print medium until it reaches the conveyance mechanism, preventing conveyance speed reduction and subsequent vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If assist control is executed to reduce back tension during paper supply, then vibrations and noise are reduced, but the flexure is eliminated too early causing conveyance speed reduction and image errors
Solution Approach 1:
The control unit executes assist control in advance during the paper supply operation, but extends it beyond the conventional timing. The assist control continues until the leading end of the print medium reaches the conveyance mechanism, ensuring the flexure is maintained until the critical transfer point is reached, thus preventing conveyance speed reduction and image errors while still reducing vibrations and noise
2Force
If the flexure in the print medium is completely eliminated during conveyance, then back tension is reduced, but conveyance speed decreases causing transfer timing errors
Solution Approach 1:
The control unit dynamically adjusts the timing of assist control execution based on the real-time position of the print medium. The assist control is executed flexibly to maintain the flexure until the leading end reaches the conveyance mechanism, optimizing the balance between back tension reduction and conveyance speed maintenance throughout the paper supply process
Data Source
AI summary
A paper supply apparatus includes: a primary paper supply roller that feeds out and conveys a print medium from a paper tray on which the print medium is placed; resist rollers that a leading end of the print medium abuts to form a flexure in the print medium by temporarily ceasing conveyance, and rotate at a predetermined timing after this flexure is formed, to convey the print medium toward a conveyance mechanism; and a control unit that executes assist control that drives the primary paper supply roller during the time that the print medium is being conveyed by the resist rollers to assist conveyance of the print medium by the resist rollers. The control unit executes the assist control such that the flexure in the print medium remains at a point in time at which the leading end of the print medium reaches the conveyance mechanism.