Wireless Tag Label Conveyance Layout for Accurate Write Positioning
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Solution Overview
Problem
Existing wireless tag writers face issues with accurate calibration and communication positioning due to sensor placement relative to the antenna, leading to potential misidentification of writing positions and erroneous communication with non-target wireless tags.
Innovation Solution
A wireless communication device with a sensor disposed between the ends of the antenna in the conveyance direction, detecting label ends to accurately determine communication positions, using a transmission or reflection type optical sensor to identify label ends and adjust conveyance to ensure proper wireless communication with target tags.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor is disposed on the upstream side of the antenna in the conveyance direction, then the label sheet can be detected before reaching the antenna position, but the wireless tag of the target label may not reach the antenna position after conveyance by the label length and label interval, requiring reverse conveyance
Solution Approach 1:
The sensor is positioned laterally between the first end and second end of the antenna in the conveyance direction, rather than strictly upstream or downstream. This lateral positioning within the antenna's operational zone allows the sensor to detect the label sheet at an optimal point that enables forward conveyance to the antenna position without requiring reverse movement, thus resolving the contradiction between detection accuracy and conveyance efficiency
2Measurement precision
If the sensor is disposed on the downstream side of the antenna in the conveyance direction, then the label sheet can be detected closer to the antenna, but the antenna may become close to the wireless tag of the subsequent label sheet, causing erroneous recognition of writing position
Solution Approach 1:
The sensor is positioned at a specific lateral location between the first end and second end of the antenna in the conveyance direction, creating a localized detection zone that is distinct from the antenna's writing zone. This spatial differentiation ensures that the sensor detects the target label without the antenna being too close to subsequent labels, thereby maintaining both detection accuracy and writing position recognition accuracy
Data Source
AI summary
A wireless communication device includes a conveyance portion, a sensor, and a communication portion, and conveys a long backing sheet, a plurality of labels, each provided with a wireless tag, being adhered with intervals in a lengthwise direction of the backing sheet. The wireless communication device detects, by the sensor, an end portion on an upstream side of the label including a wireless tag adhered on the backing sheet, while conveying the backing sheet in a conveyance direction by the conveyance portion, and performs a wireless communication with a target label when the backing sheet is conveyed by a predetermined amount in the conveyance direction. The predetermined amount is decided based on a communication state, between the communication portion and the wireless tag, detected at each of positions when the backing sheet is sequentially conveyed to a plurality of positions in the conveyance direction.