Tape Printer Link Lever Mechanism for Roll Sheet Loading
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Solution Overview
Problem
Conventional tape printing apparatuses require complex lever operations for loading and unloading roll sheets, making the process cumbersome.
Innovation Solution
A tape printing apparatus design where the roll sheet loading is simplified by using a top cover that opens and closes, with a link lever mounted rotatably and detachably on the top cover, allowing contact and separation between the carrying roller and pressing unit, enabling easy loading and reducing the apparatus's size by forming the link lever in a flat shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a lever is used to move the thermal head up and down for loading and unloading roll sheets, then the thermal head can be separated from or pressed against the platen roller, but the lever operation becomes complicated requiring multiple rotations for each loading cycle
Solution Approach 1:
The patent combines the cover opening/closing motion with the thermal head positioning function. When the cover is opened, the link lever automatically moves the thermal head away from the platen roller through its L-shaped geometry and rotational pivot, eliminating the need for separate lever operations. This merging of cover operation and head positioning simplifies the user interaction to a single intuitive motion.
Solution Approach 2:
The link lever is designed to automatically perform the thermal head positioning function in response to cover opening/closing. The L-shaped link lever, when rotated by cover movement, self-actuates the thermal head carriage to move away from or toward the platen roller without requiring additional user intervention or complex control mechanisms.
2Ease of operation
If a traditional lever mechanism is used for thermal head movement, then the function is achieved, but the apparatus size increases due to the mechanical components required
Solution Approach 1:
The patent employs a dynamic, multi-functional link lever that changes its effective geometry during operation. The L-shaped link lever rotates about a pivot point and uses its varying orientation to simultaneously achieve cover movement and thermal head positioning. This dynamic mechanism replaces larger, more rigid traditional lever systems with a compact, adaptive component that achieves the same function in less space.
Solution Approach 2:
The link lever utilizes two-dimensional planar motion in multiple directions. By rotating in a plane and using its L-shaped geometry, it translates cover opening motion into thermal head carriage movement through coordinated x and y displacements. This dimensional approach allows a single compact component to perform functions that would traditionally require multiple larger components arranged in three-dimensional space.
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
Simplifies the roll sheet loading process and reduces the size of the apparatus by allowing loading through the opening and closing of the top cover, facilitating rapid sheet insertion and printing.
Implementation Method 1
contact by pressure between the carrying roller and the pressing unit and separation from each other are achieved by means of the link lever, an end of which is mounted rotatably and detachably on the top cover
Data Source
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AI summary
If a top cover 5 has been opened, a link lever 34 is moved backward in conjunction with the motion of the top cover 5, so that a release lever 51 is rotated clockwise as seen from the left side about a level shaft 50. Also, a release gear 49 and a release shaft 48 are rotated about 180° counterclockwise as seen from the left side, via a lever gear 52. Accordingly, a head supporting member 37 is rotated downward, resisting an urging force of a pressing spring 36, so that a thermal head 32 is separated from a platen roller 35 and entry of a roll sheet 3A becomes possible through an insertion port 26.