Printing Cassette Axis Layout for Low-Loss Power Transmission
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Solution Overview
Problem
Power transmission loss occurs in printing cassettes due to insufficient engagement between the printer body and the input/output parts of the power transmission mechanism.
Innovation Solution
The rotation axes of the input and output rotational parts are arranged on opposite sides of a first imaginary straight line, and the power transmission mechanism is positioned to overlap with this line, balancing the forces applied to the guide case from engaging portions, thereby reducing engagement failures and transmission loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the rotation axes of the input and output rotational parts are arranged asymmetrically or the power transmission mechanism is positioned away from the center, then the structure may be simpler, but the force balance becomes poor leading to engagement failures and power transmission loss
Solution Approach 1:
The patent applies asymmetry in reverse - it uses symmetric arrangement of rotation axes about the first imaginary straight line to achieve force balance. The input and output rotational parts are positioned symmetrically on opposite sides of the straight line, which balances the forces applied to the guide case and prevents engagement failures, thereby reducing power transmission loss.
2Reliability
If the power transmission mechanism is positioned away from the first imaginary straight line, then the layout may be more flexible, but the force balance deteriorates causing engagement failures
Solution Approach 1:
The patent positions the power transmission mechanism and rotation axes such that they overlap with the first imaginary straight line, creating a balanced force distribution. This equipotential arrangement ensures that forces from the input and output rotational parts are evenly distributed, improving engagement reliability while maintaining a determined optimal position.
3Loss of energy
If the rotation axes are arranged on the same side of the first imaginary straight line, then the structure may be more compact, but the force becomes unbalanced causing transmission loss
Solution Approach 1:
The patent positions the input and output rotational parts on opposite sides of the first imaginary straight line, creating a counterbalancing effect. The forces generated by these rotational parts act in opposite directions, balancing each other and preventing unbalanced forces that would cause power transmission loss, while maintaining a compact overall structure.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3
AI summary
There is provided a printing cassette capable of reducing power transmission loss. The present disclosure is a printing cassette attachable to a printer body including a first engaging portion and a second engaging portion. The printing cassette includes a power transmission mechanism including an input rotational part and an output rotational part, and a guide case accommodating the power transmission mechanism therein. The guide case has a guide portion configured to guide a printing tape, a first side surface and a second side surface interposing the power transmission mechanism therebetween, a first engagement surface engageable with the first engaging portion, and a second engagement surface engageable with the second engaging portion. A first imaginary straight line is provided, the first imaginary straight line passing through the first engagement surface and the second engagement surface and being interposed between a rotation axis of the input rotational part and a rotation axis of the output rotational part.