Tape Printer Cover Lock Mechanism for Balanced Cutter Control
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Solution Overview
Problem
Existing tape printing apparatuses face issues with the cutter lever being inoperable when not in use, leading to balance problems and difficulty in constructing a lock mechanism, especially when the cutter lever and platen holder are separately arranged, making it hard to switch between operable and inoperable states.
Innovation Solution
A tape printing apparatus design featuring a cover member with engagement portions and a stopper member, where the stopper member is urged by a spring to engage with the cutter lever when the cover is removed, rendering it inoperable, and releases when the cover is attached, allowing the cutter lever to become operable, without enlarging the apparatus' width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cutter lever and platen holder are arranged at the same side of the tape printing apparatus, then the cutter lever can be easily locked in the inoperable state by contact between the stopper portion and end portion, but one side of the apparatus protrudes outward and balance is broken
Solution Approach 1:
The lock mechanism is segmented into separate components: a stopper member with engagement portions that can independently engage with the cutter lever, and a cover member with corresponding engagement portions. This segmentation allows the locking function to be distributed rather than requiring direct contact between the platen holder and cutter lever, enabling balanced arrangement of components.
Solution Approach 2:
The stopper member acts as an intermediary between the cover member and the cutter lever. When the cover is attached, the stopper member engages with both the cover's engagement portion and the cutter lever's engagement portion, mediating the locking action. This intermediary mechanism allows the cutter lever to be locked without requiring the platen holder and cutter lever to be in direct contact, solving the balance problem.
2Shape
If the cutter lever and platen holder are arranged at opposite sides of the tape printing apparatus, then the apparatus maintains balance at both sides, but it becomes very difficult to arrange a lock mechanism between the cutter lever and platen holder
Solution Approach 1:
The stopper member serves multiple functions: it acts as a locking element for the cutter lever, provides a mounting point for the spring member, and engages with the cover member to indicate proper attachment. The cover member also serves dual purposes as both a protective cover and an engagement element for the lock mechanism. This multi-functionality reduces the need for separate dedicated locking components.
Solution Approach 2:
The spring member automatically urges the stopper member to engage with the cutter lever when the cover is removed, and the engagement between the cover and stopper member automatically releases the cutter lever when the cover is attached. This self-service mechanism eliminates the need for complex manual locking operations or additional actuators, achieving the locking function through the simple attachment and removal of the cover.
3Reliability
If a lock mechanism is added to make the cutter lever inoperable when not in use, then safety is improved, but the device complexity increases
Solution Approach 1:
The lock mechanism is merged with the cover member assembly. The stopper member is integrated with the spring member and engages with both the cover and the cutter lever. The cover member itself becomes part of the locking mechanism through its engagement portions. This merging approach allows the locking function to be achieved without adding a separate, independent locking system, thereby minimizing the increase in device complexity.
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 cutter lever to be easily switched between operable and inoperable states through a simple mechanism, maintaining balance and reducing the apparatus' width, while allowing separate arrangement of the cutter lever and platen holder.
Implementation Method 1
a spring member supported to the spring support portion, the spring member urging the stopper member so as to rotate
Data Source
Figure 1
Figure 2
Figure 3
AI summary
In the tape printing apparatus 1, in the state that the back cover 11 is not attached to the apparatus body 2, the coil spring member 22 urges the stopper member 15 so as to rotate and the cutter lever 5 becomes inoperable based on that the engagement portion 15A of the stopper member 15 is engaged with the difference portion 19 of the cutter lever 5, and in the state that the back cover 11 is attached to the apparatus body 2, the stopper member 5 is rotated against the urging force of the coil spring member 22 based on that the engagement lib 14 of the back cover 11 is engaged with the engagement portion 15B of the stopper member 15 and the cutter lever 5 becomes operable based on that the engagement portion 15A of the stopper member 15 is released from the difference portion 19 of the cutter lever 5.