Printer Platen Positioning via Movable Rear Roller
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Solution Overview
Problem
Inkjet stamp printing devices face challenges in accurately positioning the platen in the horizontal direction due to tolerance issues between the positioning pin and hole portion, leading to difficulties in precise alignment.
Innovation Solution
The printer incorporates a platen support member with an engaging portion that includes a rear roller and a front roller, along with an urging portion using compression springs, to accurately position the platen at a prescribed printing position by engaging the rear engaging portion with the rear roller and the front engaging portion with the front roller, ensuring precise alignment and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a positioning pin and hole portion are used to position the platen, then the structure is simple, but the positioning precision is insufficient due to tolerance accumulation
Solution Approach 1:
The engaged portion is designed to move in the first direction relative to the platen support member, transforming a static positioning structure into a dynamic one. This movement allows the engaged portion to actively adjust and maintain precise positioning of the platen despite tolerance variations in the positioning pin and hole portion fit.
Solution Approach 2:
The engaged portion acts as an intermediary element between the positioning pin and the platen. By introducing this intermediate component that can move and engage with the engaging portion on the platen, the system achieves higher positioning precision without directly increasing the complexity of the main positioning structure.
2Manufacturing precision
If the platen is firmly fixed to prevent displacement, then positioning accuracy is improved, but ease of operation for handling and attachment deteriorates
Solution Approach 1:
The movable engaged portion allows the platen to be easily attached and detached while maintaining positioning accuracy. When attaching, the engaged portion moves to engage with the engaging portion; during operation, it maintains firm positioning; when detaching, the engagement can be released. This dynamic behavior resolves the contradiction between firm fixing and ease of operation.
Data Source
AI summary
A printer is provided with a platen support member, a platen, and a positioning portion. The platen support member supports the platen. The platen includes a rear engaging portion. The positioning portion includes a rear roller. The rear roller is provided at the platen support member, and can move in the front-rear direction with respect to the platen support member. The rear roller engages with the rear engaging portion in a state in which the platen is supported by the platen support member. The positioning portion positions the platen at a prescribed printing position in the front-rear direction, by the rear roller moving forward in a state in which the rear engaging portion is engaged with the rear roller.