| 摘要 |
PROBLEM TO BE SOLVED: To improve a cutting accuracy, to extend a life of a circular saw, and to economically control an occurrence of noise by removing a chattering vibration of a circular saw during cutting operation. SOLUTION: An arrested engagement gear train is constituted by disposing three or more odd numbers of intermediate gears which rotate synchronously and in circular engagement with a main shaft gear 29 fixed to a main shaft 26 of a circular saw cutting machine. A rotating power of an electric motor is transmitted to one of the intermediate gears 33, at least one of the intermediate gears 33 is movable, and load is imposed on at least one of the movable intermediate gears 33, thus removing a backlash of the arrested engagement gear train. The sum J (kgf.m.sec2) of a moment of inertia converted to a main spindle including the main spindle of each spindle which interlocks in a condition such that the backlash is removed from the main spindle satisfies an equation J>=F×(D/2)[1000×250×(N/60)2], where D (mm) is a diameter of a circular saw, N (rpm) is a number of rotation, and F (kgf) is a cutting force per blade as a compornent of force.
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