Printer Cutter Reversal Control for Roll Paper Jam Prevention
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Solution Overview
Problem
Printing devices that partially cut roll paper and reverse its direction to reduce top margin risk causing paper jams if the cut portion is not properly managed, leading to mechanical issues.
Innovation Solution
A printing device with a print mechanism, cutter, and conveyance mechanism that only reverses the paper direction after the roll paper is fully separated at the uncut portion, and includes sensors and controllers to prevent reversing when the paper is still connected, ensuring safe conveyance and preventing jams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the roll paper is reversed after cutting to reduce top margin, then the top margin size is reduced, but paper jams occur when the cut portion is not fully separated
Solution Approach 1:
The controller performs a preliminary check to determine whether the roll paper has been fully separated at the uncut portion before executing the reversing process. This preliminary action prevents paper jams by ensuring the paper is completely separated before reversal, while still allowing reversal to reduce top margin when conditions are safe.
2Productivity
If the reversing process is executed after cutting, then the top margin is reduced, but the cut portion may catch in the paper path causing jams
Solution Approach 1:
The controller uses feedback from the paper separation state to determine whether to execute the reversing process. By continuously monitoring whether the roll paper is fully separated at the uncut portion, the system dynamically decides to reverse only when safe, preventing paper jams while maintaining printing efficiency.
Data Source
AI summary
A printer that partially cuts roll paper to leave an uncut portion prevents paper jams from reversing the roll paper. A printer 1 has a print unit 41 for printing images on roll paper R; a cutter unit 46 disposed downstream in the conveyance direction from the print unit for cutting the roll paper and leaving an uncut portion; a conveyance unit 42 for conveying the roll paper in the conveyance direction or a reverse direction that is the opposite of the conveyance direction; and a controller 40 that executes a reversing process conveying the roll paper in reverse by the conveyance unit 42 when the roll paper is separated from the paper roll at the uncut portion after the cutter unit 46 cuts the roll paper, and not executing the reversing process in specific circumstances in which the roll paper remains connected through the uncut portion.