JPH0318130Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a mounting structure for attaching a grindstone to a chamfering device or the like for polishing the corners of stone.

(Conventional Example) For example, when chamfering a stone using a chamfering device that uses a motor to drive a grindstone, the grindstone may be replaced with one with a different coarseness as the work progresses, or a worn grindstone may be replaced with a new one. Although it becomes necessary to replace the grindstone, there is no known mounting structure that allows the grindstone to be easily replaced.

(Purpose of the invention) The object of the invention is to provide a mounting structure that allows a grindstone to be easily attached to a drive unit such as a motor, and also allows the grindstone to be easily removed from the drive unit.

(Structure of the invention) The mounting structure of the grindstone according to the invention includes a cylindrical joint member on the driving side, a columnar joint member that is removably fitted into the inner circumference of the cylindrical joint member, and an outer peripheral surface of the columnar joint member. 1 protruding from each other at intervals of 180 degrees in the circumferential direction and slidably fitting into a pair of grooves formed along the axial direction on the inner circumferential surface of the cylindrical joint member.
a pair of protrusions, a grindstone concentrically fixed to the columnar joint member, and a cushion that fits on the outer periphery of the columnar joint member and is interposed between the grindstone and the front end surface of the cylindrical joint member. and a ball that engages both joint members with each other in the axial direction, and a sleeve that slidably fits on the outer periphery of the cylindrical joint member and fixes the ball, and the grinding wheel of the pair of protrusions The end surface on the opposite side is formed round, and the rotational force of the cylindrical joint member is transmitted to the columnar joint member by fitting the protrusion and the groove, and the sleeve is moved to allow the ball to float. By changing the state, both the joint members can be freely separated.

(Example) First, the grinding wheel unit of the present invention will be explained with reference to FIG. 1, which is a broken side view, and FIG. 2, which is a rear view taken in the direction of the - arrow. It consists of a disc-shaped receiving plate 3 fixed to the receiving plate 3, a substantially cylindrical joint member 4 fixed concentrically to the receiving plate 3, and a cushion 5 (rubber) that fits into the joint member 4 and is baked to the receiving plate 3. has been done. An annular groove 6 having a substantially semicircular cross section is formed along the circumferential direction on the outer circumferential surface of the joint member 4, and a pair of protrusions 7b are protruded from each other at an interval of 180 degrees in the circumferential direction. There is. The protrusion 7b has a substantially rectangular cross section, extends in the axial direction, and has a rounded end face on the side opposite to the grindstone 2 side.

Next, the mounting structure of the grinding wheel unit 1b will be explained with reference to FIG. 3, which is a broken side view, and FIG. 4, which is a sectional view taken along line XII of FIG. ing. The coupling member 8 has an annular outward flange 10 at its front end, and the flange 1
0 is in contact with the cushion 5. Also, joint member 8
has a bottom 11 at its rear end, and a pair of grooves 23 are formed along a predetermined length from its front edge at intervals of 180 degrees in the circumferential direction. This groove 23 reaches from the inner peripheral surface to the outer peripheral surface. The protrusion 7b fits into the groove 23, and prevents both the joint members 4 and 8 from rotating.

A pair of circular holes 13 are provided at positions facing the annular groove 6 of the joint member 8, and the insides of the holes 13 are tapered into a spherical shape. The pair of balls 14 are fitted into the hole 13 and the groove 6 at the same time, causing the joint members 4 and 8 to engage with each other in the axial direction. Further, the ball 14 is fixed by a sleeve 15 that fits around the outer periphery of the joint member 8, and its movement is prevented. The front end of the sleeve 15 contacts the flange 10, and an annular recess 16 is provided on the inner periphery of the front end of the sleeve 15. Further, an annular outward flange 17 is provided at the rear end of the sleeve 15. Flange 17 and annular lid 1
A spring 20 is compressed between the annular lid 18 and the annular lid 18.
is fixed to the boss cylinder 21. The joint member 8 is connected to a motor (not shown) via a suitable drive mechanism (not shown) disposed within the boss cylinder 21.
Note that the sleeve 15 can slide rearward while compressing the spring 20.

During operation, the rotational force of the motor is transmitted to the grindstone 2 via the drive mechanism and both joint members 4 and 8. When replacing the grindstone 2, the motor is stopped and the sleeve 15 is moved backward. When the recess 16 reaches a position facing the ball 14, the ball 14 can freely move between the hole 13 and the recess 16. In this state, the lock between the joint members 4 and 8 is released, so that the grindstone 2 can be removed as a unit and replaced with another grindstone. When the sleeve 15 is returned to its original position after replacement, the ball 14 is fixed by the sleeve 15 and both joint members 4 and 8 are locked by the ball 14. Note that the amount of movement of the sleeve 15 is regulated to such an extent that the ball 14 does not escape out of the sleeve during replacement.

In embodying the present invention, instead of providing the annular groove 6, a pair of grooves extending in the front-rear direction may be provided on the outer peripheral surface of the joint member 4. Alternatively, a pair of circular recesses into which the balls 14 fit may be formed in the joint member 4. Moreover, the bottom 11 can also be abolished.
The rear end of the spring 20 can also be supported by a member other than the annular lid 18. For example, an integral annular outward flange may be provided at the rear end of the coupling member 8, and the rear end of the spring 20 may be supported by the flange. Also, if the spring 20 is provided, the sleeve 1
5 can be moved with one touch, but this spring 20 is eliminated and the sleeve 1
It is also possible to fix 5 to the joint member 8 with bolts or the like. In that case, when replacing the grindstone 2, the sleeve 15 may be moved by loosening the bolt, for example. It is also possible to provide three or more balls 14. Further, the grindstone 2 can also be formed into a disk shape. The joint member 4 and the receiving plate 3 may be integrally molded.
Alternatively, the joint member 8 may be directly connected to the motor. Note that the present invention can also be applied to electric polishing devices other than chamfering devices.

(Effects of the invention) As explained above, according to the invention, there are provided protrusions on the outer peripheral surface of the columnar joint member at intervals of 180 degrees in the circumferential direction, and on the inner peripheral surface of the cylindrical joint member in the axial direction. A pair of protrusions are provided that are slidably fitted into a pair of grooves formed along the columnar joint member, and the rotational force of the cylindrical joint member is transmitted to the columnar joint member by the engagement between the protrusion and the groove. If it is necessary to install a grindstone with a large outer diameter, by increasing the length of the protrusion in the axial direction, that is, in the front-rear direction, the torque generated during polishing can be handled without changing the outer diameter of the columnar joint member. It can provide the rigidity that can be achieved,
Therefore, the whole can be designed compactly. Moreover, since the protrusions protrude from the outer peripheral surface of the columnar joint member, when inserting and fitting the columnar joint member into the cylindrical joint member, it is possible to visually confirm the fit between the protrusion and the groove, making the work safer and faster. I can do it. In addition, since a cushion is provided that fits on the outer periphery of the columnar joint member and is interposed between the grinding wheel and the front end surface of the cylindrical joint member, it is possible to avoid driving due to backlash during fitting due to dimensional errors during manufacturing. The vibration of the columnar joint member and the cylindrical joint member can be alleviated, and the adverse effect of vibration on the fitting surface between the columnar joint member and the cylindrical joint member, which is particularly noticeable in stone processing, can be eliminated. In other words, grindstone (diamond) powder or stone powder that has entered the gap between the mating surfaces of the columnar joint member and the cylindrical joint member adheres to the mating surface.
It is possible to solve the problem that the life of the columnar joint member or the cylindrical joint member is greatly reduced due to wear of the fitting surface due to vibration. In addition, since the end faces of the pair of protrusions on the side opposite to the grinding wheel are rounded, the protrusions protrude from the outer peripheral surface of the columnar joint member, making it possible to visually confirm the fit between the protrusions and the grooves. ,
When inserting and fitting the columnar joint member into the cylindrical joint member, the protrusion can be easily and smoothly inserted into the groove, and at the same time, the protrusion can be gradually broken from the corner of the end face due to shock and vibration during driving. The synergistic effect of the strong anti-rotation structure provided with a pair of protrusions and the damping of vibration provided by the cushion reliably prevents deterioration of the protrusions, extending the life of the product. can be significantly extended. In other words, due to play between the groove and the protrusion due to dimensional errors during manufacturing, the force due to shock and vibration during driving tends to concentrate on the corner of the end face of the protrusion opposite to the grinding wheel. In the present invention, this end face is rounded, so there is no concentration of the force mentioned above, and since one pair of protrusions is provided, the anti-rotation structure is stronger compared to the case where one protrusion is provided. Since the cushion is provided, the vibrations are greatly reduced, so the protrusion does not break.

[Brief explanation of the drawing]

Fig. 1 is a cutaway side view of the grinding wheel unit according to the present invention, Fig. 2 is a rear view as viewed from the - arrow in Fig. 1, Fig. 3 is a cutaway side view showing the mounting structure of the grindstone according to the present invention, and Fig. 4 is a cutaway side view of the grinding wheel unit according to the present invention. FIG. 4 is a sectional view taken along line XII-XII in FIG. 3; 2... Grindstone, 4... Approximately cylindrical joint member (an example of a columnar joint member), 5... Cushion, 7b... Protrusion, 8... Approximately cylindrical joint member (an example of a cylindrical joint member), 14... ...Ball, 15...Sleeve, 23
……groove.

Claims (1)

[Scope of utility model registration request] A cylindrical joint member on the drive side, a columnar joint member that is removably fitted to the inner periphery of the cylindrical joint member, and a columnar joint member that protrudes from the outer peripheral surface of the columnar joint member at intervals of 180 degrees from each other in the circumferential direction. a pair of protrusions that are slidably fitted into a pair of grooves formed along the axial direction on the inner circumferential surface of the cylindrical joint member; and a pair of protrusions that are concentrically fixed to the columnar joint member. a grindstone, a cushion that fits on the outer periphery of the columnar joint member and is interposed between the grindstone and the front end surface of the cylindrical joint member, and a ball that engages both joint members with each other in the axial direction. a sleeve that is slidably fitted to the outer periphery of the cylindrical joint member and fixes the ball, and an end surface of the pair of protrusions opposite to the grindstone side is formed round;
The rotational force of the cylindrical joint member is transmitted to the columnar joint member by fitting the projection and the groove, and the two joint members can be freely separated by moving the sleeve and putting the ball in a floating state. The mounting structure of the whetstone is characterized by: