Sheet Bending Control in Printing Apparatus
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Solution Overview
Problem
Existing printing apparatuses face challenges in maintaining optimal sheet bending to ensure high-quality printing and efficient discharge, as the formation of loops between conveyance rollers can lead to irregularities and jams, affecting printing quality and efficiency.
Innovation Solution
A printing apparatus with a conveyance control unit that individually controls the driving of conveyance rollers and includes detection units to monitor and adjust the sheet bending, ensuring appropriate loop formation and preventing jams by stopping the upstream conveyance roller during cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the driving force of the upstream conveyance roller is made larger than that of the downstream conveyance roller to form a loop, then the sheet bending is formed for printing, but irregularities and jams occur affecting printing quality
Solution Approach 1:
A detection unit is provided between the first and second conveyance units to detect bending of the sheet. The conveyance control unit receives detection results and adjusts the driving forces of the conveyance rollers based on feedback, stopping the upstream conveyance roller when appropriate loop formation is detected to prevent irregularities and jams while maintaining printing quality
Solution Approach 2:
The driving forces of the conveyance rollers are dynamically adjusted during operation. The conveyance control unit individually controls the driving of each conveyance unit based on detection results, making the system adaptive rather than static, allowing optimal loop formation without causing jams
2Ease of manufacture
If the conveyance roller on the upstream side is stopped to decrease the loop for cutting, then cutting can be performed, but printing operation must be maintained
Solution Approach 1:
The conveyance system is divided into independently controllable segments (first conveyance unit and second conveyance unit). The conveyance control unit can individually control each segment, allowing the upstream roller to be stopped for cutting while the downstream roller continues printing operations, enabling independent control of different functional zones
Data Source
AI summary
A printing apparatus, comprising a storage unit for storing a sheet, a printing unit for printing on the sheet conveyed by a first conveyance unit from the storage unit, a second conveyance unit, provided between the first conveyance unit and the storage unit, for conveying the sheet from the storage unit toward the first conveyance unit, a conveyance control unit for controlling driving of the first and the second convey units such that the sheet is bent between the first conveyance unit and the second conveyance unit, and a detection unit, provided between the first and the second conveyance units, for detecting bending of the sheet, wherein the conveyance control unit stops conveyance of the sheet by the first conveyance unit based on a detection result of the detection unit.