| 摘要 |
The present invention is a display device having a control circuit, a position detector, a converting circuit and a display circuit. The control circuit is provided for computing and processing data. The position detector is mounted on a woodworking machine and connects with the control circuit for detecting a position of a blade of the woodworking machine and transmitting signals to the control circuit. The converting circuit is coupled with the control circuit for receiving and converting the signals from the position detector into digital signals. The control circuit computes frequency variation of the digital signals from said converting circuit and based on a relation to convert the digital signals to a position information. The display circuit connects with the control circuit for showing the position information.
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