| 摘要 |
PURPOSE:To facilitate the muting without complicated constitution by providing a cam mechanism between an operating member and a muting switch operating piece. CONSTITUTION:In depressing a pushbutton 12, an operating member 13 is forwarded and a channel selection member 8 is forwarded interlockingly via a toungue piece 10 or the like, gears 7, 21 mesh with each other to set the channel selecting state. In depressing the button 12 further in this state, the operating part of a turning piece 41 is pressed into contact with the slope of a cam 42 attended with the forward of the member 13, a muting switch operating piece 37 is moved right, a muting switch S is turned on to select the muting state. Thus, it is not required to increase the operating stroke length of the member 8 for the muting control and the muting operation is facilitated without complicated constitution.
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