Thermal Printer with Pivotable Paper Guide for Jam Maintenance
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Solution Overview
Problem
Existing thermal printers of the autoloading type face challenges in maintaining high printing accuracy while minimizing the number of parts and ensuring easy maintenance, particularly when dealing with paper jams or foreign matter accumulation.
Innovation Solution
A thermal printer design featuring a pivotable paper guide that forms a sheet passage between a platen roller and a thermal head, with a pivot axis coaxial to the platen shaft, allowing easy access for maintenance and removal of foreign matter, and incorporating snap-fit portions for secure fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the paper guide is made separable to enable maintenance, then ease of repair is improved, but device complexity increases due to additional fixing parts
Solution Approach 1:
The paper guide is designed to be pivotable about a pivot axis, transitioning between a guide position (during printing) and an open position (for maintenance). This dynamic configuration eliminates the need for separate fixing parts while enabling easy access to the sheet passage for removing paper jams and foreign matters.
2Ease of repair
If the paper guide is made separable for maintenance, then ease of repair is improved, but printing accuracy may deteriorate due to misalignment
Solution Approach 1:
The pivot axis is integrated with the platen shaft, combining the rotation axis of the platen roller with the pivot axis of the paper guide. This integration ensures that when the paper guide is returned to the guide position after maintenance, it automatically aligns correctly with the platen roller, preventing misalignment and maintaining printing accuracy.
3Productivity
If the gap between thermal head and platen roller is reduced to eliminate margins, then productivity is improved, but ease of operation deteriorates when removing foreign matter
Solution Approach 1:
The paper guide can be pivoted to an open position, exposing the sheet passage and allowing easy access to remove paper jams and foreign matters from the gap between the thermal head and platen roller, while maintaining the small gap configuration for efficient printing during normal operation.
Data Source
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AI summary
A thermal printer (1) includes: a housing (2); a platen roller (3) supported on the housing (2) so as to be rotatable; a thermal head (4) housed in the housing (2) and arranged so as to be opposed to the platen roller (3); and a paper guide (5) that forms a sheet passage for a sheet between the housing (2) and the paper guide (5), and is pivotally supported on the housing (2) so as to be pivotable about a pivot axis (31) between a guide position at which the sheet is allowed to be fed between the platen roller (3) and the thermal head (4), and an open position at which the sheet passage for the sheet is exposed.