Printer Partition Member Lock Mechanism for Ribbon Feeding Stability
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Solution Overview
Problem
In thermal transfer printers, it is difficult to stably feed the ink ribbon during replacement, leading to instability in the printing process.
Innovation Solution
The printer incorporates a partition member with a lock mechanism that holds the gears in mesh position during activation, ensuring stable ink ribbon feeding and facilitates easy ribbon replacement by switching the partition member between close and open positions, allowing precise transmission of drive force and guiding the ribbon through a defined passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the ink ribbon is replaced by simply swapping the spool shaft, then the replacement operation is simple, but the ink ribbon cannot be fed stably during printing
Solution Approach 1:
The device is segmented into a partition member (containing gears and ribbon guide) and a spool shaft (ribbon supply). This segmentation allows the partition member to be independently positioned to ensure proper gear meshing and ribbon alignment, while the spool shaft can be easily replaced. The segmentation resolves the contradiction by decoupling the replacement simplicity from the feeding stability requirements.
Solution Approach 2:
The partition member acts as an intermediary between the drive mechanism (gears) and the ribbon supply (spool shaft). By positioning the partition member at a specific position, it mediates the transmission of drive force through the gears to the ribbon shaft, ensuring stable ribbon feeding. This intermediary role allows the system to maintain reliability during operation while keeping the replacement process simple.
2Reliability
If the gears are always in mesh position, then the ribbon feeding is stable, but the ribbon replacement becomes difficult
Solution Approach 1:
The partition member is designed to be dynamically positionable between a first position (gears in mesh) and a second position (gears disengaged). This dynamic positioning allows the system to switch between stable feeding mode and easy replacement mode. When printing, the partition member is at the first position ensuring gear meshing and stable feeding. When replacement is needed, it moves to the second position allowing easy spool shaft swapping, thus resolving the contradiction between stability and ease of operation.
3Ease of operation
If the partition member is made movable for easy replacement, then the replacement workability improves, but the gear meshing position becomes unstable
Solution Approach 1:
The gear meshing stability function is extracted and embedded within the partition member structure. By making the partition member movable rather than fixing the entire assembly, the invention isolates the stability-critical gear meshing mechanism within a component that can be independently positioned and locked. This extraction allows the partition member to be moved for replacement while maintaining stable gear meshing when in the operational position.
Data Source
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AI summary
A printer includes a printing unit configured to print on the print medium, a ribbon shaft configured to hold the ink ribbon, a partition member provided swingably between a close position where gears that transmit drive force to the ribbon shaft mesh with each other and an open position where meshing between the gears is released, and a lock mechanism configured to hold the partition member with respect to the printing unit when the partition member is placed at the close position.