Tape Printing Sensor Unit Biasing for Detection Precision
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In tape printing devices, manufacturing tolerance leads to positional shifts of the tape cartridge, resulting in suboptimal distances between photointerrupters and specification display portions, which compromises detection ability and correct identification of tape specifications.
Innovation Solution
A tape printing device with a sensor unit and biasing portion that presses against the tape cartridge's wall surface, maintaining an optimal detection distance and improving detection ability through a holder with a leading inclined surface and external light shielding, and partition members to prevent optical sensor interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If photointerrupters are fixed on the cartridge mounting portion, then the structure is simple, but manufacturing tolerance causes positional shifts that reduce detection precision
Solution Approach 1:
The sensor unit is made movable relative to the cartridge mounting portion through a sliding mechanism. The sensor unit can move in the radial direction of the shaft to maintain optimal detection distance despite cartridge position variations caused by manufacturing tolerance. This dynamic adjustment resolves the contradiction by allowing positional adaptation without complex repositioning systems.
Solution Approach 2:
The sensor unit automatically adjusts its position to maintain optimal detection distance through the sliding mechanism. When the cartridge is mounted, the sensor unit self-adjusts radially to compensate for manufacturing tolerance variations, eliminating the need for manual calibration or complex positioning systems.
2Measurement precision
If the sensor unit is positioned close to the tape cartridge for optimal detection, then detection ability improves, but external light interference increases
Solution Approach 1:
A light shielding plate is introduced as an intermediary element between the sensor unit and the external environment. The light shielding plate blocks external light from reaching the photointerrupters while allowing the sensor unit to maintain its optimal detection position close to the tape cartridge. This resolves the contradiction by filtering harmful light without increasing detection distance.
3Adaptability or versatility
If multiple photointerrupters are arranged to detect specification display portions, then specification identification capability improves, but positional alignment becomes more sensitive to tolerance
Solution Approach 1:
The sensor unit's ability to move radially allows all photointerrupters to maintain optimal detection distance simultaneously, even when the cartridge position varies within tolerance ranges. This dynamic adjustment ensures that multiple specification display portions can be detected accurately without requiring extremely precise fixed positioning.
Solution Approach 2:
The movable sensor unit design serves multiple functions: it enables detection of multiple specification display portions with different photointerrupters while simultaneously compensating for manufacturing tolerance variations. This multi-functionality resolves the contradiction by making the system adaptable to various cartridge positions.
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
The solution ensures precise positioning and enhanced detection ability by maintaining optimal distances and shielding external light, thereby improving the accuracy of tape specification identification.
Implementation Method 1
a detection portion that irradiates the portion to be detected with a detection light and reads the portion to be detected
Implementation Method 2
a biasing portion that biases the sensor unit toward a predetermined wall surface side
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3
AI summary
An object is to provide a tape printing device which is able to cause a distance from a detection portion of the tape printing device to a portion to be detected of a tape cartridge to be an optimum distance and to improve a detection ability of the detection portion. A tape printing device 1 on which a tape cartridge 100 is mounted, the device includes a sensor unit 300 that faces a type reading pattern 145 formed on a base end surface of the tape cartridge 100; and a unit biasing portion 304 that biases the sensor unit 300 toward a base end surface side. The sensor unit 300 has a sensor portion 310 that irradiates a type reading pattern 145 with a detection light and reads the type reading pattern 145, and a sensor holder 312 that supports the sensor portion 310 and presses the base end surface by biasing of the unit biasing portion 304.