Printing Apparatus Belt Positioning for Curl Prevention
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Solution Overview
Problem
Printing apparatuses with transporting belts that remain stationary for extended periods can develop curls, leading to degradation in print quality due to changes in medium orientation when the belts are reactivated, as the tension causes uneven rotation and misalignment.
Innovation Solution
A control unit is implemented to rotate the transporting belt to a different position when it has been stationary for a predetermined period, preventing curls from forming and ensuring smooth operation by adjusting the belt transport start timing based on the position of initial wound portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transporting belt remains stationary for extended periods, then the apparatus can be stored or idle, but curls form in the transporting belt causing degradation in print quality
Solution Approach 1:
The transporting belt is rotated periodically even during idle periods to prevent curl formation. The control unit determines whether to rotate the belt based on the elapsed time since the last rotation, implementing a periodic action that maintains belt flatness and prevents degradation in print quality during extended idle periods.
2Reliability
If the transporting belt is rotated frequently, then curls are suppressed, but energy consumption increases
Solution Approach 1:
The control unit rotates the transporting belt periodically based on elapsed time thresholds, rather than continuously or at every idle period. This periodic rotation suppresses curl formation while minimizing unnecessary energy consumption by rotating only when needed to maintain belt flatness.
3Loss of energy
If the transporting belt is not rotated during idle periods, then energy is saved, but curls form and print quality degrades
Solution Approach 1:
The control unit implements periodic rotation of the transporting belt based on elapsed time criteria, balancing energy conservation with print quality maintenance. The belt is rotated only when the elapsed time since the last rotation exceeds a predetermined threshold, preventing curls while minimizing energy consumption during idle periods.
4Ease of operation
If the transporting belt rotates smoothly under tension, then medium transport is stable, but curls form when stationary
Solution Approach 1:
The control unit periodically rotates the transporting belt during idle periods to prevent curl formation, while maintaining the tension and smooth rotation characteristics during active medium transport. This periodic action ensures the belt remains flat and ready for stable medium transport when needed.
Data Source
AI summary
A printing apparatus includes a plurality of belt rollers that rotate, a direction in which a rotation axis of each belt rollers extends being a width direction that intersects a transport direction of a medium; a transporting belt that, while wound across the plurality of belt rollers, rotate to transport the medium in the transport direction; a print head that performs printing on the medium transported by the transporting belt; and a control unit that rotates the transporting belt while in a state in which an unrotated state of the transporting belt has continued for a predetermined period. When a rotation position of the transporting belt after application of power and before rotating the transporting belt is referred to as an initial rotation position, in a case in which a rotation of the transporting belt is to be stopped, the control unit stops the transporting belt at a rotation position that is different from the initial rotation position.