| 摘要 |
PROBLEM TO BE SOLVED: To provide a router machine capable of making an operation atmosphere good by decreasing a noise generated by the machine in machining operation. SOLUTION: A speaker 13 and a sensor michrophone 14 are arranged near an edge driving part 2. The sensor microphone 14 is arranged at a position capable of effectively collecting a noise of a motor 2a rotating an edge 4 and a noise at a tip part of the edge 4 cutting a game board 9, and the speaker 13 is also arranged at a position capable of generating a sound toward a source wherein the noise is generated. An antiphase sound-generating circuit is contained in a control part 11, a sound collected by the sensor microphone 14 is converted to a collected sound signal 1a of an electric signal, inputted into the antiphase sound generation circuit, and a control sound signal 1b outputted from the antiphase sound-generating circuit is inputted to an amplifier 15. It is converted to a sound by the amplifier 15, a control sound is emitted from the speaker 13, and a motor sound and a noise when the game board 9 is machined are negated by interference with the control sound to be attenuated.
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