JPH0448924Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a table reciprocating device for a grinding machine in which the reciprocating stroke of a table equipped with a grindstone shaft can be made variable.

[Prior art]

In a grinding machine table reciprocating device that reciprocates a grindstone shaft relative to a workpiece that is rotationally driven on a headstock, the table that supports the grindstone shaft is placed on standby by a reciprocating means such as a hydraulic cylinder. The cylinder is rapidly moved from one position to the processing position and held fixed at that position, and an eccentric cam mechanism provided at the end of the piston rod is operated to reciprocate the table. This eccentric cam mechanism consists of a slide ring fixed to the end of the piston rod, an eccentric cam that slides inside the slide ring, and a drive shaft that is pivotally mounted on the bed and rotates the eccentric cam. By rotationally driving the eccentric cam, the eccentric cam is moved eccentrically, and the table is reciprocated via the slide ring according to the amount of eccentricity of the eccentric cam. For example, in the 1980s
Publication No. 138626 describes such an eccentric cam divided into an inner cam and an outer cam.

[Problem that the invention attempts to solve]

In the conventional table reciprocating device as described above, the reciprocating stroke of the table on which the grindstone shaft is mounted is uniformly determined by an eccentric cam mechanism provided at the end of the piston rod. Therefore, when changing the reciprocating stroke, it is necessary to make adjustments such as replacing the eccentric cam, and there is a problem in that the table must be returned to the standby position each time such adjustment is made.

This invention was made taking these circumstances into consideration,
It is an object of the present invention to provide a table reciprocating device for a grinding machine that can vary the reciprocating stroke of a table on which a grindstone shaft is mounted.

[Means for solving problems]

The means of the present invention includes a table reciprocating device of a grinding machine including: an eccentric shaft pivotally mounted to a bed so as to be rotatable; and a table provided on the bed so as to be movable forward and backward relative to the eccentric shaft. a swinging member whose one end surface side in the axial direction is fitted onto the eccentric shaft in sliding contact with the eccentric shaft and swings as the eccentric shaft rotates; a connecting member that interlocks and connects the swinging member and the table; The rotatable guide member has a guide groove into which the movable member is loosely fitted so that the movable member swings in one direction.

[Effect]

When the eccentric shaft is rotated on the bed, one axial end surface side of the eccentric shaft is in sliding contact with the outside, and the swinging member loosely fitted into the guide groove of the guide member is in sliding contact with the eccentric shaft. Swing in the direction you are. The swinging motion is transmitted to the table via the connecting member, and the table swings. Then, when the guide member is rotated, the swinging direction of the swinging member changes with respect to the table. Then, the amplitude of the swing acting on the table changes depending on the rotation angle, the reciprocating stroke of the table is changed, and the amplitude of the tool provided on the table relative to the workpiece is adjusted.

[Effect of idea]

The table reciprocating device for the grinding machine of the present invention includes an eccentric shaft pivotally mounted to the bed so as to be rotatable;
a table provided on the bed so as to be movable forward and backward with respect to the eccentric shaft; a swinging member fitted externally with one end surface in the axial direction in sliding contact and swinging by rotation of the eccentric shaft; A connecting member that interlocks and connects the member and the table, and a rotatable guide member having a guide groove into which the swinging member is loosely fitted so that the swinging member swings in one direction are provided. The reciprocating stroke can be variably adjusted.

〔Example〕

The present invention will be described in detail below based on examples thereof.

The table reciprocating device for a grinding machine shown in this example is capable of changing the reciprocating stroke of the table to adjust the amplitude of the tool relative to the workpiece, and is configured as follows.

As shown in FIGS. 1 to 3, an eccentric shaft 2 is vertically rotatably pivotally mounted on a bed 1, and a table 3 is mounted on the bed so that it can move forward and backward with respect to the eccentric shaft 2. It is located on 1. A swinging member 4 is externally fitted onto the eccentric shaft 2 with one end surface in the axial direction in sliding contact with the eccentric shaft 2, and swings as the eccentric shaft 2 rotates.
is provided, and its swinging member 4 is operatively connected to the table 3 by a connecting member 5. The guide member 6 is arranged so that the swinging member 4 swings in one direction.
The swinging member 4 is loosely fitted into a guide groove 7 formed by the swinging member 6, and by rotating the guide member 6, the direction of swinging of the swinging member 4 with respect to the table 3 can be changed.

The eccentric shaft 2 has bearings 9 and 10 on the bed 1.
It is pivotally mounted via bearings 12 and 13 within an outer cylinder 11 which is vertically pivoted via bearings 12 and 13. At its upper end, as shown in _FIG.
A disc-shaped sliding convex portion 2a is formed eccentrically by α from , while a pulley 14 fixed to the lower end thereof is transmission connected to a pulley on the drive source side (not shown), and the eccentric shaft 2 is It is adapted to be rotated with respect to the bed 1. And eccentric shaft 2
The flange portion 2b at the lower end of the sliding convex portion 2a on the disk formed at the upper end is the flange portion 11 at the upper end of the outer cylinder 11.
It fits into a circumferential groove 11b drilled inside the flange portion 11a, so that the upper surfaces of both flange portions 2b and 11a are flush with each other.

The swinging member 4 is formed with a slightly oblong sliding recess 4a that is fitted in and in sliding contact with one end surface in the axial direction of the sliding projection 2a. On the other hand, a pair of guide members 6 are integrally erected and fixed on both sides of the upper surface of the flange 11a, and a guide groove 7 is formed between the two guide members 6. The swinging member 4 is loosely fitted into the guide groove 7 so that it can swing freely with the sliding recess 4a fitted into the sliding projection 2a.

As shown in FIGS. 1 and 3, the swinging member 4
One end of the connecting member 5 that connects the table 3 to the swing member 4 is pivotally connected via a bush 17 to a support shaft 16 that is erected and fixed on the swinging member 4, and the other end is erected and fixed on the upper surface of one end of the slide member 18. It is pivotally attached to a support shaft 20 via a bush 21. Embedded bolts (not shown) are implanted in the support shaft 16 and the support shaft 20, and are screwed and fixed to the swing member 4 and the slide member 18, and are integrally fixed and erected to the swing member 4 and the slide member 18. It is reinforced and supported by supporting members 15 and 19. A shaft 24 is rotatably supported on the slide member 18 via bearings 22 and 23, and the shaft 24 connects to the output shaft of a motor 26 provided at the other end of the slide member 18 via a flexible coupling 25. is connected to. A threaded groove 27 is screwed into the shaft 24, which is fixed to the table 3 side and screwed into an internally threaded member 28. With such a configuration, as shown in FIG. 5, the grindstone shaft 31 rotatably supported by a wheel head 32 provided on the table 3 is rotatably supported on the cutting table 33. It is designed to be moved forward and backward relative to a workpiece 35 held by a supported chuck 34.

Then, as shown in Fig. 4, the bearing 3
The outer cylinder 11, which is integrated with the guide member 6 forming the guide groove 7, is rotated by a shaft 39 which is pivotally supported by the guide members 6 and 37 and is transmission connected to the servo motor 38, via a worm gear mechanism (not shown). It is designed to be rotated. By this rotation of the outer cylinder 11, the direction and position angle of the guide groove 7 relative to the table 3 is changed, the direction of swinging of the swinging member 4 relative to the table 3 is changed, and the reciprocating stroke of the table 3 is adjusted. Ru. That is, Figure 2a
As shown in FIG.
Since the direction of arrow D, which is the swinging direction, coincides with the direction of arrow C, the table 3 is reciprocated by the amplitude of the swinging member 4 via the slide member 18. Then, as shown in FIG. 2b, the servo motor 38
When guide groove 7 is rotated by can be moved back and forth by the same distance.
Note that when the guide groove 7 faces in a direction perpendicular to the reciprocating direction of the slide member 18 and the table 3,
If the guide groove 7 is formed in an arc shape with a curvature centered on the support shaft 20 of the connecting member 5, the swinging member 4
The amplitude of can be set to 0. As described above, according to the table reciprocating device for a grinding machine of this example, the servo motor 38 is operated based on the map stored in advance in the control means consisting of a microcomputer, and the swinging member 4 is oscillated relative to the table 3. By controlling and adjusting the direction accurately, the reciprocating stroke of the table 3 can be changed and adjusted as appropriate. Therefore, when a table reciprocating device like this example is adopted for a grinding machine controlled by a numerical control device, when changing setups, the table 3 is placed on standby in order to adjust the reciprocating stroke as in the past. Immediately after the table 3 is moved to the processing position by the motor 26 without returning to the working position, the servo motor 38 is activated to automatically adjust the amplitude of the tool relative to the workpiece.

[Brief explanation of the drawing]

Fig. 1 is a front view of the main parts of the table reciprocating device of the grinding machine of the present invention, and Fig. 2a is the - in Fig. 1.
2b is a plan view showing the state in which the guide groove is rotated, FIG. 3 is an overall sectional view of the table moving device, and FIG. 4 is a view taken along the - line in FIG. Figure 5 is an overall view of the grinding machine. DESCRIPTION OF SYMBOLS 1... Bed, 2... Eccentric shaft, 3... Table, 4... Swinging member, 5... Connection member, 6... Guide member, 7... Guide groove.

Claims (1)

[Scope of Claim for Utility Model Registration] An eccentric shaft pivotally mounted to the bed so as to be rotatable; a table provided on the bed so as to be movable forward and backward relative to the eccentric shaft; a swinging member that is externally fitted in sliding contact with the eccentric shaft and swings as the eccentric shaft rotates; a connecting member that interlocks and connects the swinging member and the table; and a connecting member that swings in one direction. 1. A table reciprocating device for a grinding machine, comprising: a rotatable guide member having a guide groove into which the table is loosely fitted.