JPH04327044A - Power transmitting mechanism - Google Patents

Abstract

PURPOSE:To ensure a stable operation by providing two eccentric shafts mutu ally rotating with a phase difference of 180 deg., axially reciprocating two reciprocat ing members by the rotation of the eccentric shafts, respectively, to give braking action to the second reciprocating member by the first reciprocating member. CONSTITUTION:When a rotating shaft 1 is rotated, this rotation is transmitted to a rotating shaft 3 through bevel gears 2, 4 to eccentrically rotate shafts 3a, 3b. Of the eccentric rotation of the eccentric shaft 3a, the eccentric operation vertical to the paper face is absorbed by a pin 5, and only the reciprocating movement in the axial direction of the rotating shaft 1 is transmitted to a first reciprocating member 6 to reciprocate a saw plate 9 in the arrowed direction A. Thus, the cutting of a bone, for example, is conducted by a saw tooth provided on the saw plate 9. At this time, the rotation of the eccentric shaft 3b is simultaneously transmitted to a second reciprocating member 12 through a connecting link 10 and a pin 11 to similarly reciprocate the member 12, but as this moving direction is reversed, the saw plate 9 is reciprocated in stable state.

Description

[Detailed description of the invention]

0001

[Technical Field] The present invention relates to a power transmission mechanism, more specifically,
The present invention relates to a mechanism for converting rotation of a rotating shaft into reciprocating motion in the axial direction of the rotating shaft.

0002

BACKGROUND OF THE INVENTION In dental treatment, microengines are used to cut teeth by rotating at high speed. However, recently, medical technology has become subdivided and specialized, and for example, there are specialists who only treat the hands or only the feet. Therefore, in treating only the hands and feet,
Treatments such as bone cutting and cutting are required, but until now, there have been no cutting tools suitable for these treatments for the bones of the hands and feet, which has been extremely inconvenient.

0003

[Purpose] The present invention was made in view of the above-mentioned circumstances, and in particular, the present invention was made for the purpose of providing a cutting tool suitable for cutting or cutting fine bones of hands and feet. .

0004

[Structure] In order to achieve the above object, the present invention provides a power transmission mechanism for converting a rotational motion of a rotating shaft into an axial reciprocating motion of the rotating shaft, the power transmission mechanism comprising: a bevel gear that converts rotation of the shaft into rotation of a second rotation axis perpendicular to the rotation axis; a first eccentric shaft that rotates eccentrically with respect to the second rotation axis; and the first eccentric shaft. 180 to axis
° a second eccentric shaft that rotates eccentrically; a first reciprocating member that reciprocates only in the axial direction of the rotating shaft in response to the rotation of the first eccentric shaft; and a second reciprocating member that reciprocates only in the axial direction of the rotating shaft in response to rotation, and the second reciprocating member performs a braking action on the first reciprocating member. This is a characteristic feature. Hereinafter, the present invention will be explained based on examples.

FIG. 1 is a configuration diagram for explaining an embodiment of a power transmission mechanism according to the present invention, and in the figure, 1 indicates, for example,
A rotating shaft used in dental treatment connected to a rotating shaft rotated by a well-known micro engine; 2 is a bevel gear attached to the tip of the rotating shaft 1; 3 is a second rotating shaft; The rotating shaft 3 is a second rotating shaft that meshes with the bevel gear 2.
The bevel gear 4 rotates around an axis perpendicular to the rotating shaft 1. This rotating shaft 3 has eccentric shafts 3a and 3b, and these eccentric shafts 3a and 3b are provided 180 degrees apart from the shaft 3. 4 is a connecting link whose one end is engaged with the eccentric shaft 3a and the other end is engaged with the pin 5; 6 is a first reciprocating member connected to the connecting link 4 via the pin 5; and 7 is the first reciprocating member. a guide pin for smoothly reciprocating the first reciprocating member 6; 8 a chuck member screwed to the first reciprocating member 6; 9 a saw plate;
In use, as is well known, the saw plate 9 can be fixed to the second reciprocating member 6 by loosening the chuck 8, inserting the saw plate 9, and then tightening the chuck 8. . A second connecting link 10 has one end engaged with the second eccentric shaft 3b and the other end engaged with a pin 11. A second reciprocating member 12 is attached to the pin 11.

Therefore, when the rotating shaft 1 is rotated, the rotation is transmitted to the second rotating shaft 3 via the bevel gears 2 and 4, causing the shafts 3a and 3b to rotate eccentrically. Of the eccentric rotation of the eccentric shaft 3a, the eccentric movement in the direction perpendicular to the plane of the paper is absorbed by the pin 5, and only the reciprocating movement in the left-right direction, that is, the axial direction of the rotating shaft 1, is transmitted to the first reciprocating member 6. Saw board 9 with arrow A
For example, the serrations provided on the saw plate 9 cut bones. At this time, the rotation of the eccentric shaft 3b is simultaneously transmitted to the second reciprocating member 12 via the connecting link 10 and the pin 11, and the rotation of the eccentric shaft 3b is transmitted to the second reciprocating member 12.
2 is reciprocated in the left-right direction in the same way as the first reciprocating member 6, but as described above, since the eccentric shafts 3a and 3b are 180° apart from the shaft 3, the direction of movement is opposite. . That is, when the first reciprocating member 6 moves to the left, the second reciprocating member 12 moves to the right, and when the first reciprocating member 6 moves to the right, the second reciprocating member 12 moves to the right. The reciprocating member 12 moves to the left. This second reciprocating member 12 works as a braking member for the first reciprocating member 6, in other words, it works as a balancer against the rotation of the rotary shaft 3, and makes the rotation of the rotary shaft 3 more stable. To make the reciprocating movement of the plate 9 more smooth.

[0007]

[Effects] As is clear from the above description, according to the present invention, the rotation of the rotating shaft can be converted into reciprocating motion that reciprocates in the direction of the rotating shaft, and the reciprocating motion can be made more smoothly. It is possible to provide a power transmission mechanism that can perform the following steps.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional configuration diagram for explaining one embodiment of the present invention.

[Explanation of symbols]

1... Rotating shaft, 2, 4... Bevel gear, 3... Second rotating shaft, 3a
, 3b... Eccentric shaft, 4, 10... Connection link, 5, 11... Pin, 6... First reciprocating member, 8... Chuck, 9... Saw plate,
12...Second reciprocating member.

Claims (1)

[Claims] 1. A power transmission mechanism for converting rotational motion of a rotating shaft into axial reciprocating motion of the rotating shaft, the power transmission mechanism converting the rotation of the rotating shaft into a reciprocating motion perpendicular to the rotating shaft. a bevel gear that converts the rotation of a second rotation shaft; a first eccentric shaft that rotates eccentrically with respect to the second rotation shaft;
a second eccentric shaft that rotates eccentrically by 180° with respect to the eccentric shaft; a first reciprocating member that reciprocates only in the axial direction of the rotating shaft in response to rotation of the first eccentric shaft; Said second
a second reciprocating member that reciprocates only in the axial direction of the rotating shaft in response to the rotation of the eccentric shaft, and the second reciprocating member performs a braking action on the first reciprocating member. A power transmission mechanism characterized by: