| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an electronic boring tool equipped with a rotation speed control circuit which controls a rotation speed when an electric motor starts operation to the number of low-speed revolutions, and is improved in the operability of a switch trigger. <P>SOLUTION: A motor control means 50 is constituted as follows: the means automatically controls an electric motor 40 to rotate at a low speed so that the number N of revolutions of the motor and a load current I do not exceed set values Nt and It, respectively, after the start of the operation by an end tool 20 is detected; and when the load current I of the electric motor 40 is increased up to or beyond a set value during the automatic control of the low speed rotation, the number N of revolutions of the electric motor is controlled to become a high speed rotation according to a pulling amount of a switch trigger 61. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
