| 摘要 |
<P>PROBLEM TO BE SOLVED: To perform transmission such that a tooth cutting bar can be moved back and forth in the axial direction of the tooth cutting bar as well, and to inhibit use of a gear for the transmission of rotation further, when transmitting the rotation of a rotary shaft rotated by a motor or the like to the tooth cutting bar, in a micromotor for dental treatment. <P>SOLUTION: The micromotor handpiece for dental treatment includes a rotary shaft 2 disposed inside a handpiece 1 and a rotary cylinder 3 disposed inside a head part 1 and rotated by the rotary shaft 2, the tooth cutting bar is inserted to the rotary cylinder 3 and a tooth is treated. The rotary shaft 2 has a projection part 2a eccentric to the rotary shaft 2, the rotary cylinder 3 has a peripheral groove 3a to which the projection part 2a is to be inserted, and when the rotary shaft 2 is rotated, the rotary cylinder 3 is moved back and forth in the axial direction. The rotary shaft 2 has a large diameter part 2b whose front surface is the base part of the projection part 2a, the rotary cylinder 3 has a large diameter part 3b to be in contact with the front surface of the large diameter part, the outer peripheral surface of the large diameter part 3b is in frictional contact with the radius part 2b' of the large diameter part surface of the rotary shaft 2, and the rotation of the rotary shaft 2 is transmitted to the rotary cylinder 3. <P>COPYRIGHT: (C)2013,JPO&INPIT |
