Tape Printer Positioning Projection Placement for Accurate Cartridge Loading
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Solution Overview
Problem
In tape printers, the positioning projection is often located closer to the platen shaft than the detection unit, leading to increased backlash and dimension errors, which can result in incorrect positioning of the platen roller with respect to the print head and detection units, affecting the correct loading and printing of tape cartridges.
Innovation Solution
The positioning projection is placed farther than the detection unit with respect to the platen shaft, and also provided in peripheral positions close to the print head and winding shaft, ensuring correct engagement with the positioning recess and reducing dimension errors, allowing for precise positioning of the tape cartridge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the positioning projection is located closer to the platen shaft than the detection unit, then the positioning projection can engage with the positioning recess, but the detection target shifts with respect to the detection unit when the tape cartridge is rotated, causing positioning errors
Solution Approach 1:
The patent positions the positioning projection in a different spatial dimension relative to the platen shaft - specifically farther away from the platen shaft than the detection unit. This dimensional rearrangement allows the positioning projection to engage with the positioning recess while minimizing the shift amount of the detection target with respect to the detection unit when the tape cartridge is rotated, thereby resolving the contradiction between engagement reliability and detection precision
2Reliability
If the positioning projection is located away from the print head, then the positioning projection can engage with the positioning recess, but the dimension error between the positioning projection and the print head increases
Solution Approach 1:
The patent changes the positional parameter of the positioning projection relative to the print head by locating it farther from the platen shaft than the detection unit. This parameter adjustment reduces the dimension error between the positioning projection and the print head when the tape cartridge is correctly engaged, while still maintaining reliable engagement with the positioning recess
Data Source
AI summary
A tape printer that includes: a cartridge loading portion to which a tape cartridge is loaded, the tape cartridge including a cartridge case and a platen roller accommodated in the cartridge case, the cartridge case having a positioning recess and a first detection target portion of which shape is varied depending on various types of tape cartridge; a platen shaft provided in the cartridge loading portion and inserted into the platen roller; a first detection unit provided in the cartridge loading portion, of which output changes depending on the shape of the first detection target portion; and a positioning projection provided at a position farther than the first detection unit with respect to the platen shaft in the cartridge loading portion when seen from a near side in a loading direction of the tape cartridge, and engaging with the positioning recess.