JPH0640506U - Power transmission mechanism - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a power transmission mechanism that is not significantly affected by load fluctuations. A support shaft 23 orthogonal to the rotary shaft 1 and a oscillating member 22 that oscillates around the support shaft 23 are provided. The rotary motion of the oscillator 22 is reciprocated in the axial direction of the rotary shaft 1. The oscillator 22 is shown in FIG.
As shown in (b), there is a groove 22a having a long diameter in the axial direction of the support shaft 23, and a rotary motion member 21 for transmitting the rotation of the rotary shaft 1 in a sliding motion is provided in the groove 22a.
It is inserted through 4. The rotary motion member 21 moves in the groove 22a in the axial direction (longitudinal direction) of the support shaft 23, but does not move in the short and short directions, and therefore swings around the support shaft 23. This swinging is transmitted to the member 2 via the connecting member 25.
Move 6 back and forth.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a power transmission mechanism, and more particularly, to a mechanism for converting rotation of a rotary shaft into a motion that moves back and forth coaxially with the rotary shaft.

[0002]

[Prior art]

 In dental treatment, cutting of teeth by high-speed rotation using a micro engine is performed. However, in recent years, medical technology has been subdivided and specialized, and, for example, a hand-only specialist or a foot-only specialist has appeared. Thus, in the treatment of only these hands and feet, it is necessary to perform treatments such as cutting and cutting of bones, but conventionally, there is no cutting tool suitable for treating the bones of the hands and feet, and it is extremely difficult to do so. I felt inconvenient.

In view of the circumstances as described above, the present applicant has previously proposed a pencil type cutting tool suitable for cutting or cutting the fine bones of hands and feet (Japanese Patent Application No. 3-36958). .

FIG. 2 is a cross-sectional view for explaining an example of a power transmission mechanism previously proposed by the present applicant, in which 1 is a rotary shaft, and the rotary shaft 1 is well known in dental treatment, for example. It is a rotary shaft connected to the rotary shaft that is rotated by the micro engine of. It should be noted that this power transmission mechanism is preferably used by being attached to a power section of a motor handpiece currently marketed as a dental treatment tool in place of a well-known grip section used at the time of dental treatment. is there.

The rotation of the rotary shaft 1 is transmitted to the second rotary shaft 3 which rotates at a position eccentric with respect to the rotary shaft 1 via the tilt rotation transmission mechanism 2. As shown in FIG. 2 (b), a bearing ring 4 is eccentrically provided on the tip 3a of the second rotary shaft 3, and the bearing 4 rotates eccentrically with respect to the second rotary shaft 3. To do. Reference numeral 5 denotes a swinging member which is swung by the eccentric rotation of the bearing 4, and the swinging member 5 has a width in the XX direction on the side facing the bearing 4, as shown in FIG. A recess 5a having a diameter equal to the diameter of the bearing 4 and a width in the YY direction larger than the maximum eccentric amount of the bearing is provided, and the bare ring 4 is inserted into the recess 5a. . Therefore, when the second rotating shaft 3 rotates, the swinging member 5 reciprocates in the XX direction about the shaft 5b. The swinging member 5 is supported by a supporting member 6 which rotates coaxially with the swinging member 5, for example, by being fitted into a hollow hole 6a of the supporting member 6. The support member 6 is rotatably attached to the fixed member 8 by a bearing 7.

Reference numeral 9 is a bearing fixed side member, 10 is a washer, 11 is a mounting bolt, 12 is a saw plate, and a screw 6b is provided in the hollow hole 6a of the rotating member 6, and the screw 6b is provided. The mounting bolt 11 is screwed onto the. Therefore, by sandwiching one end of the saw plate 12 between the bearing fixing member 9 and the washer 10 and rotating the bolt 11, the saw plate 12 can be fixed between the bearing fixing member 9 and the washer 10, When the rotary shaft 1 is rotated, the saw plate 12 reciprocally rotates together with the rotation supporting member 6 in a direction perpendicular to the plane of the drawing.

[0007]

[Problems to be solved by the device]

 According to the power transmission mechanism described above, the rotary motion of the rotary shaft 1 is converted into the swing motion of the saw plate 12 that rotates coaxially with the rotary shaft 1. The power transmission paths up to the oscillating movement of 12 are all rotational movements about the rotary shaft 1, so when a large load is applied to the saw plate 12, the load is suddenly transmitted to the rotary shaft 1. There was a problem that it was easily affected by load fluctuations.

Therefore, the present invention has been made for the purpose of providing a power transmission mechanism that is suitable for use in a pencil-type cutting tool such as that described above, that is, that is not significantly affected by load fluctuations.

[0009]

[Embodiment] FIG. 1 is a main part configuration diagram for explaining an embodiment of a power transmission mechanism according to the present invention. In FIG. 1 (a), 1 is a rotation corresponding to the rotary shaft 1 shown in FIG. The rotating shaft 1 is rotated by the rotation of a rotating shaft, which is rotated by a motor (not shown) or the like, via the reduction gear mechanism 20 and the like.

Reference numeral 21 is a scrigging rotary shaft which is rotatively moved by the rotating shaft 1, 22 is a oscillating member which is oscillated around the shaft 23 by the scrigging rotating shaft 21, and the oscillating member 22 A concave portion 22a is provided in the concave portion 22a, and the sliding-motion rotary shaft 21 is connected to the concave portion 22a via a bearing 24.

FIG. 1B is a sectional view taken along the line BB of FIG. 1A, and the recess 22a is formed to have a long diameter in a direction parallel to the axis 23, as shown in FIG. 1B. In this recess 22a, the bearing 24 is movable in the major axis direction (arrow) and is immovable in the minor axis direction.

Therefore, as described above, when the shaft 21 reciprocates, the oscillating member 22 oscillates around the shaft 23 to generate the axial reciprocating motion of the rotary shaft 1. Reference numeral 25 denotes a connecting member for converting the swinging motion of the swinging member 22 into reciprocating motion of the rotating shaft 1 in the axial direction, and 26 denotes reciprocating motion reciprocating in the axial direction of the rotating shaft 1 by the connecting member 25. When a saw plate is attached to the tip of the reciprocating member 26 (not shown), the saw plate reciprocates in the axial direction of the rotary shaft 1.

When it is desired to rotate the saw plate about the axis of the rotary shaft 1, the reciprocating member 26 is formed in the hollow portion 26a as shown in FIG. An inclined groove 26b inclined in the axial direction is formed in the periphery, and a rotary member 27 fixed in the axial direction and rotatable about the axis is inserted in the hollow portion 26a. When the protrusion 27b provided on the periphery is engaged with the inclined groove 26, the rotating member 27 rotates about the axis when the reciprocating member 26 reciprocates in the axial direction. . Therefore, when the above saw plate is attached to the rotating member 27, the saw plate rotates about the rotation axis 1.

[0014]

[Effect of device]

 As is apparent from the above description, according to the present invention, it is possible to effectively convert the rotational movement of the motor or the like into the reciprocating movement in the axial direction coaxial with the motor shaft or the rotational movement around the motor shaft. Moreover, since power transmission from the load side to the power side is almost impossible, it is possible to provide a power transmission mechanism that is not affected by load fluctuations.

[Brief description of drawings]

FIG. 1 is a main part configuration diagram for explaining an embodiment of a power transmission mechanism according to the present invention.

FIG. 2 is a diagram for explaining an example of a power transmission mechanism previously proposed by the applicant.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Rotation axis, 2 ... Inclination rotation axis, 3 ... Second rotation axis, 4 ...
Bearing, 5 ... Oscillating member, 6 ... Rotating member, 7 ... Bearing, 8 ... Fixed side member, 9 ... Bearing fixing member, 10
... Washers, 11 ... Bolts, 12 ... Saw plates, 20 ... Reduction mechanism, 21 ... Serigot rotary motion member, 22 ... Swing member,
23 ... Support shaft, 24 ... Bearing, 25 ... Coupling member, 2
6 ... Reciprocating member, 27 ... Rotating member.

Claims (3)

[Scope of utility model registration request] 1. A power transmission mechanism for converting the rotation of a rotary shaft into a motion that reciprocates in the axial direction of the rotary shaft, the power transmission mechanism comprising: a support shaft orthogonal to the rotary shaft; A oscillating body that oscillates around a support shaft, the oscillating body is oscillated around the support shaft by the rotation of the rotating shaft, and the oscillating motion of the oscillating body of the rotating shaft is A power transmission mechanism characterized by reciprocating motion in the axial direction. 2. The oscillating member has an elongated hole groove in a direction parallel to the support shaft, and eccentric rotation of the rotary shaft is transmitted into the elongated hole groove. The power transmission mechanism described in. 3. The power transmission mechanism according to claim 1, wherein the rotation of the rotary shaft is a grooving motion.