JPH023424Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to, for example, a circular arc movement mechanism of a grinding machine, such as a rotating arm that carries a saddle of a workpiece to be ground and moves in an arc.

``Prior art'' and ``Problems to be solved by the invention'' The rotating arm of the grinding machine described above is a cantilever-shaped rotating arm supported by a rotating shaft, and a saddle for the workpiece to be ground is placed on the rotating arm. The workpiece (object to be ground)
It is structured to process. Therefore, the swing arm receives a considerable weight at the middle and near the tip of the cantilever beam, and is also subjected to grinding resistance, so that it is likely to be elastically bent, and there is a risk that the grinding accuracy will be reduced due to the bending.

Therefore, in order to solve the above-mentioned problems, a guide support part that is concentric with the arc movement is provided on the lower surface of the swing arm at the middle or near the tip, and a thrust bearing-like rolling bearing body is installed on the entire upper surface of the guide support part. There is a structure in which the swing arm and its rolling bearing are laid in contact with each other, and the swing arm is moved in an arc while being supported through the rolling bearing.

According to the conventional structure described above, it is extremely difficult to process and install the rolling bearing body by laying it on the entire upper surface of the bearing guide, and in addition, most of the rolling bearing body other than the lower surface of the swivel arm is exposed. Since it is difficult to take measures to prevent dust in the parts, there are drawbacks such as deterioration of the accuracy of the grinding machine, etc.

The purpose of the present invention is to solve the above-mentioned conventional difficulties.

``Means for Solving the Problems'' The present invention achieves the above objectives by ``In a cantilever-shaped swing arm that is supported on a rotating shaft and moves in a circular arc back and forth through a required angle, is provided with a guide support forming a concentric circle with the circular arc, and a bearing housing having a notch is attached to the back side of the swing arm, and further, the rolling body is mounted in the holding cage in the bearing housing. The arc-shaped thrust bearing bodies are arranged in
a structure in which the rotary arm is rotatably housed with a portion exposed from the notch, and the swing arm rolls on and contacts the guide support with a thrust bearing body in the exposed portion interposed therebetween. There is.

"Example" and "Operation" Hereinafter, the present invention will be explained in detail. Referring to FIG. 1, which shows one embodiment of the present invention, the figure shows an embodiment of an arcuate movement mechanism of a rotating arm for mounting a workpiece saddle of a grinding machine. In the figure, the swing arm 1 is an arc-moving body supported on a rotating shaft 2 and makes a reciprocating angular movement of 90 degrees as indicated by the arrow A in the figure. The guide support 3, which has a smooth surface, is designed in the form of a rail.

At the middle back side of the swing arm 1, there is a bearing housing 5, which is a notched disc body with a part of the circumference cut out.
is attached to the lower surface of the swing arm 1, and a circular thrust bearing body 6 is rotatably housed in the bearing housing 5, and a part of the thrust bearing body 6 is housed through a notch in the bearing housing 5. A notched annular bearing accommodating portion 7 is formed to expose the bearing accommodating portion 7. Specifically, the thrust bearing body 6 has rolling bodies 8 of balls or rolls (balls in the figure) arranged in an annular shape with a small pitch, and
It is formed by an annular holding cage 9 that holds the center part of the rolling bodies 8 to maintain the arrangement posture, and the rolling bodies 8 are interposed between relatively moving members and brought into rolling contact. It is arranged like this. Further, the notch of the bearing housing 5 is arranged along the inner edge 3' of the guide support part 3, and a part of the thrust bearing body 6 accommodated in the bearing housing part 7 is inserted into the notch of the bearing housing 5. The exposed part is interposed between the guide support part 3 and the lower surface of the swing arm 1, and the rotation of the rolling element 8 and the rotation of the thrust bearing body 6 in the direction of arrow B in the figure 3 and the swinging arm 1 are brought into rolling contact, and the swinging arm 1 is configured to move in an arc.

That is, the swing arm 1 fixed to the rotating shaft 2 in the form of a cantilever is supported near its free end (tip) by the guide support part 3, and by the interposed thrust bearing body 6. It is configured to reciprocate in an arc while rollingly contacting the guide support portion 3. Wiper bodies 10A and 10B are attached to both sides of the above-mentioned swing arm 1 to clean the upper surface of the guide support part 3 during each arc movement. In addition. 1 in the diagram
1 is a fixing bolt for the bearing housing 5.

In the above-described arc motion mechanism of the present invention, a bearing housing 5 that houses a thrust bearing body 6 is provided on the back side of the swing arm 1. 1 and the rail-shaped guide support part 3 are configured to roll in contact and reciprocate in a circular arc, in contrast to the conventional structure described above,
The structure is simplified and the processing of the mechanism becomes easier. Since the rolling contact is made by utilizing a portion of the thrust bearing body 6 housed in the housing, the dust-proofing measures for the rolling contact portion can be achieved by sliding the upper surface of the wiper 10A, 10B or the guide support portion 3 of the above embodiment. This is fully possible by attaching a lip piece or the like that makes dynamic contact, so it has a unique effect of maintaining good accuracy of the rotating arm of the work saddle in, for example, a grinding machine.

``Effects of the invention'' As described above, the arc motion mechanism of the present invention simplifies dust prevention of the rotating arm of a grinder, maintains good accuracy, and simplifies the rotating mechanism to facilitate machining. It has the effect of making

[Brief explanation of the drawing]

FIG. 1: An arcuate movement mechanism according to an embodiment of the present invention is shown, with A being a front view thereof, B being a front cross-sectional view thereof, and C being a bottom view of its rotating arm. Main symbols: 1: Swivel arm, 2: Rotating shaft, 3: Guide bearing, 5: Bearing housing, 6: Thrust bearing body, 7: Bearing housing, 8: Rolling body, 9: Holding cage.

Claims (1)

[Scope of utility model registration request] In a swing arm that is supported on a rotating shaft and moves in a reciprocating circular arc through a required angle, at the lower middle of the swing arm,
A guide support part concentric with the circular arc is provided, and a bearing housing having a cutout part is attached to the back side of the swing arm, and further,
An annular thrust bearing body in which rolling elements are arranged in a holding cage is rotatably housed in the bearing housing with a portion exposed from the notch, and the thrust bearing body is rotatably housed in the bearing housing. An arcuate movement mechanism characterized by a structure in which the swing arm rolls on and comes into contact with the guide support.