Thermal Head Retention Mechanism for Printing Apparatus
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Solution Overview
Problem
In thermal transfer printing apparatuses, the fixing member can come off during thermal head replacement, posing retrieval difficulties due to loosening of the fixing member, which may fall inside the apparatus.
Innovation Solution
A printing apparatus design featuring a shaft with a first engaging part, a head holder for rotational support, a shaft holder with a second engaging part, and a guide mechanism to prevent the shaft from coming off, allowing secure attachment and detachment of the thermal head while preventing the fixing member from falling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the fixing member is loosened to replace the thermal head, then the thermal head can be detached, but the fixing member may come off and fall into the inside of the printing apparatus
Solution Approach 1:
The guide member is pre-configured with a guiding surface that automatically guides the fixing member to the engaging position between the shaft and shaft holder when the shaft holder is moved to the engaging position. This preliminary positioning action ensures the fixing member is properly retained before thermal head replacement begins, preventing it from falling into the apparatus.
Solution Approach 2:
The guide member acts as an intermediary component between the shaft holder and the fixing member. Its guiding surface mediates the movement and positioning of the fixing member, ensuring it remains properly engaged with the shaft during the thermal head replacement process while allowing necessary movements.
2Ease of operation
If the shaft holder is moved to the non-engaging position for thermal head detachment, then the thermal head can be removed, but the fixing member may come off from the shaft holder
Solution Approach 1:
The guide member is pre-configured with a guiding surface that automatically guides the fixing member to the engaging position between the shaft and shaft holder when the shaft holder is moved to the engaging position. This preliminary positioning action ensures the fixing member is properly retained before thermal head replacement begins, preventing it from falling into the apparatus.
Solution Approach 2:
The guide member's guiding surface automatically performs the function of positioning and retaining the fixing member without requiring additional control mechanisms or user intervention. The geometry of the guiding surface itself provides the necessary guidance, making the system self-servicing and avoiding increased device complexity.
Data Source
AI summary
There is provided a printing apparatus including: a thermal head including heating elements arranged in a first direction; a shaft extending in a second direction; a first engaging part; a head holder; an insertion part; a shaft holder holding the shaft; a second engaging part engageable with the first engaging part so that the shaft does not come off from the shaft holder; a guide configured to guide the shaft holder movably between engaging and non-engaging positions; a fixing member; and a fixing member-holder. The fixing member fixes the shaft holder to the head holder in a case that the shaft holder is located at the engaging position. The fixing member-holder holds the fixing member so that the fixing member does not come off from the shaft holder in a case that the shaft holder is located at the non-engaging position.