Thermal Printer Head Positioning via Pivot Shaft
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Solution Overview
Problem
Existing thermal printers face challenges in accurately positioning the guide member and thermal head due to dimension accuracy issues, leading to complex configurations and increased component counts.
Innovation Solution
A printing unit design featuring a pivotable thermal head supported by a head support member with a pivot shaft, a head frame, and a guide member, where the thermal head and guide member are positioned relative to the head frame through the pivot shaft, reducing the need for fastening members and simplifying the configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fastening members such as screws or dowels are used to mount the guide member to the head frame, then the guide member can be securely fixed, but the positioning accuracy between the thermal head and guide member deteriorates due to dimension accuracy issues of the head frame
Solution Approach 1:
The patent introduces a pivot shaft as an intermediary component that serves as a common reference for positioning both the thermal head and guide member. The pivot shaft acts as a mediator that eliminates the need for separate fastening members, providing a unified positioning reference that ensures high accuracy alignment between the thermal head and guide member while maintaining secure fixation.
2Ease of manufacture
If mounting portions for fastening members are formed in the head frame and guide member, then the guide member can be mounted, but the configuration becomes complicated and the number of components increases
Solution Approach 1:
The patent merges the positioning and fastening functions into a single integrated structure. The pivot shaft simultaneously serves as the positioning reference and the fastening mechanism, eliminating the need for separate mounting portions and fastening members. This consolidation reduces the number of components and simplifies the overall configuration while maintaining the mounting capability.
3Ease of operation
If the thermal head is supported to be pivotable on the head frame, then the thermal head can move toward the platen roller for printing, but the positioning accuracy may deteriorate due to pivot movement
Solution Approach 1:
The pivot shaft serves as a precise intermediary that enables controlled pivoting motion of the thermal head while maintaining accurate positioning. The pivot shaft provides a defined rotation center and axis, ensuring that the thermal head moves along a precise arc toward the platen roller. This intermediary mechanism allows the thermal head to be movable for printing operations while maintaining high positioning accuracy through the constrained rotational path.
Data Source
AI summary
A printing unit includes a thermal head, a platen roller, a head support member and a guide member. The platen roller is abutted against the thermal head with the recording sheet therebetween and rotated to feed the recording sheet. The head support member pivotably supports the thermal head around a pivot shaft so as to move the thermal head toward the platen roller. The head frame pivotably supports the head support member via the pivot shaft and rotatably supports the platen roller. The guide member guides the recording sheet between the thermal head and the platen roller. The thermal head and the guide member are positioned with respect to the head frame through the pivot shaft.