Cassette Pressure Portion Mechanically Switches Platen Roller Speed
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Solution Overview
Problem
Conventional printing devices require an operation for origin confirmation each time the rotation speed of the motor is switched, delaying the start of printing when switching between different printing speeds.
Innovation Solution
A cassette with a pressure portion that mechanically switches the rotation speed of the platen roller by moving a specific gear upon attachment, eliminating the need for origin confirmation operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the rotation speed of the motor is switched by controlling the rotational direction, then the rotation speed of the platen roller can be changed for different printing modes, but an origin confirmation operation is required each time, delaying the start of printing
Solution Approach 1:
The cassette performs the gear switching action in advance during the attachment process itself. The pressure portion moves the specific gear to the appropriate position (first or second position) before printing begins, so that when printing starts, the correct rotation speed ratio is already established without requiring additional origin confirmation operations
Solution Approach 2:
The cassette automatically performs the speed ratio switching function through its own attachment action. The pressure portion is driven by the attachment movement itself, which automatically moves the gear without requiring external control operations, making the system self-sufficient in performing the switching function
2Adaptability or versatility
If a switching mechanism is used to change over the rotation speed of the platen roller, then different printing speeds can be achieved, but the mechanism increases device complexity
Solution Approach 1:
The specific gear acts as an intermediary element that mediates between the motor and platen roller. By moving this single gear between two positions, the system achieves rotation speed switching without requiring a complex multi-component switching mechanism, simplifying the overall device structure
Solution Approach 2:
The switching function is segmented into a simple binary choice (gear in first position or second position) rather than a continuous or multi-position control system. This segmentation reduces the complexity of the switching mechanism while maintaining the ability to provide different rotation speeds for different printing modes
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the printing device to start printing more quickly by automating the speed switching process, reducing the time required to initiate printing when switching between different rotation speeds.
Implementation Method 1
The pressure portion is configured to move the specific gear in the first direction upon attachment of the cassette to the cassette receiving portion
Data Source
AI summary
A cassette is detachably attachable to a printing device in a first direction, the printing device including a print head, a platen roller, a motor for generating a driving force to rotate the platen roller, and a power transmission portion for transmitting the driving force to the platen roller. The cassette includes a printing tape, a casing accommodating the printing tape, and a pressure portion. Upon attachment of the cassette to a cassette receiving portion of the printing device, the pressure portion is configured to move a specific gear of the power transmission portion in the first direction to allow the power transmission portion to mechanically switch a ratio of a rotation number of the platen roller to a rotation number of the motor in accordance with a position of the specific gear in the first direction.