Automatic Zero Reset in Electronic Measuring Tapes
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Solution Overview
Problem
Conventional electronic measuring tapes often fail to accurately reset the length measurement to zero even after the tape is completely rewound, requiring manual adjustment.
Innovation Solution
A length measuring device with a rotating part, rotation sensing mechanism, and control part that automatically resets the measurement to zero when the tape is fully rewound, utilizing a hook sensing part, magnetic sensor, or inertial sensor to determine the rewound state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a manual zero adjustment function is provided, then the user can reset the measurement length to zero, but the operation becomes more complex and requires manual intervention
Solution Approach 1:
The length measuring device automatically detects when the tape is fully rewound and resets the measurement value to zero without requiring manual intervention. The control unit monitors the rotation of the rotating part and automatically performs the reset function, making the system self-servicing and eliminating the need for users to manually press reset buttons.
Solution Approach 2:
The system incorporates a rotation sensing part that continuously monitors the rotation of the rotating part and provides feedback to the control unit. When the sensing part detects that the tape has been fully rewound (indicated by the rotating part returning to its initial position), it triggers the control unit to automatically reset the measurement value, creating a closed-loop feedback system.
2Ease of operation
If the measurement value is automatically reset when the tape is fully rewound, then the ease of operation is improved, but the device complexity increases due to additional sensing and control mechanisms
Solution Approach 1:
The rotating part serves multiple functions: it winds and unwinds the tape during measurement, acts as a mechanical indicator of tape extension, and provides rotational information to the rotation sensing part for determining when the tape is fully rewound. This multi-functionality reduces the need for separate dedicated components.
Solution Approach 2:
The patent replaces complex mechanical zero-reset mechanisms with an electronic control system. Instead of using mechanical switches or complex mechanical indicators to detect the rewound state, the invention uses a rotation sensing part (such as a magnetic sensor or optical sensor) to detect the rotational position of the rotating part, simplifying the mechanical structure while adding electronic intelligence.
3Productivity
If conventional electronic measuring tapes are used, then the extracted length is automatically calculated and displayed, but the measurement may not be accurately reduced to zero depending on the rewound state
Solution Approach 1:
The control unit continuously receives feedback from the rotation sensing part about the rotational position of the rotating part. By monitoring whether the rotating part has returned to its initial position (indicating full rewinding), the system determines when to reset the measurement value to zero, ensuring accurate zero-point measurement.
Solution Approach 2:
The system performs preliminary detection of the rewound state before resetting the measurement value. The control unit monitors the rotation sensing part's output to confirm that the tape is fully rewound (the rotating part has returned to its starting position) before executing the zero reset, preventing premature or incorrect reset operations.
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 automatic and accurate resetting of the length measurement to zero, eliminating the need for manual intervention and ensuring precise measurements.
Implementation Method 1
The hook sensing part may include a magnetic sensor for sensing a strength of the magnetic field.
Implementation Method 2
a rotation sensing part which senses a rotation of the rotating part
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The present disclosure relates to a length measuring device having an automatic zero point adjusting function and a control method thereof. According to an embodiment of the present disclosure, a length measuring device includes a line to which a hook part is attached at one end, a case having an opening formed therein, a rotating part to be rotated according to extraction or retraction of the line out of or into the case through the opening, a rotation sensing part which senses a rotation of the rotating part, and a control part which converts an amount of rotation of the rotating part into a length measurement value and resets the converted length measurement value to a predetermined value when the length measuring device is in a first state.