JPH0222200Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention is a slide table device used in machine tools, measuring instruments, etc., specifically a slide table device in which a table is moved by a slide mechanism consisting of a feed screw and a nut. In particular, the present invention relates to improvements in the joint between a nut and a table.

BACKGROUND TECHNOLOGY A slide table device used in machine tools, measuring instruments, etc., as shown in FIG.
, a feed screw 2 arranged parallel to the moving direction of the table 1 and rotatably supported on the base, and a nut 3 screwed onto the feed screw 2.
By transmitting the axial displacement of the nut 3 corresponding to the rotation of the feed screw 2 to the table 1, the table 1 can have a predetermined linear accuracy or a predetermined movement accuracy.

Problems to be solved by the invention: Feed screw 2 in the above sliding table device
Warping, bending, etc. occur during the manufacturing process, and this tendency is more pronounced when it is thin and long. As a result, the 8th
As shown in the figure, the shaft core oscillates during rotation, and the nut 3 vibrates as the feed screw 2 rotates.

By the way, in the conventional slide table device,
As shown in FIG. 7, since the nut 3 is fixed to the table 1 via the bracket 4, the vibration of the nut 3 described above is immediately transmitted to the table 1, which affects the positioning accuracy and straightness of the table 1. There were drawbacks that were said to have a negative impact.

Means for solving the problem This invention is intended to solve the above problem, and the technical means to solve the above problem are as follows.
A magnet is buried in the underside of the table, and the appropriate suction force of this magnet allows the rectangular part of the connector, which is made of a rectangular body with a cylindrical embossing integrally hung vertically, to be movable in a direction perpendicular to the direction of movement of the table. The embossment of the connector is held by the table so as to be slidable in the axial direction between the connector holder fixed to the nut and the connector holder slidably fitted into the connector holder, and the connector holder is slidably inserted into the connector holder. A retaining nut screwed onto a screw provided at the end of the connector receiver is pressed against the connector with an appropriate preload through an elastic body.

Effect: With the above technical means, even if the nut vibrates due to the whirling of the feed screw, the vibration of the nut is absorbed and no force other than in the axial direction of the feed screw is transmitted to the table. That is, to explain with reference to the drawings, as shown in FIGS. 4 to 6, the deflection in the X-X direction is caused by the connector 15 sliding against the table 11 in a plane perpendicular to the axis of the feed screw 13. The deflection in the Y-Y direction is absorbed by the relative movement between the embossing 15b of the connector 15 and the connector receiver 17, etc. Since the direction of relative movement of the emboss, that is, the Y-Y direction, the feed always passes through the virtual center axis of the screw, it is possible to respond immediately to the wobbling of the feed screw, and the wobbling is absorbed smoothly.

Embodiment FIGS. 1 to 6 are explanatory diagrams of a slide table device according to this invention. In the same figure, 11
A table is supported reciprocally on a base (not shown), and a magnet 12 is embedded and fixed in a coupling surface 11a on one side of the table. 13 is table 11
The nut 14 is screwed into a feed screw arranged parallel to the direction of movement of the base and rotatably supported by the base. 15 is the joint surface 11 of the table 11
A connector made of a magnetic material attached to a, which can be moved in a direction perpendicular to the movement direction of the table 11 by being guided by a pair of guides 16, 16 that are fixed to the coupling surface 11a facing each other with the connector sandwiched therebetween. is being sucked in. That is, when the nut 14 moves in the X-X direction within the radial plane due to the swing of the feed screw 13, the connector 15
It is adjusted so that it moves relative to 1 and is adsorbed. This connector 15 is a rectangular block 15.
It is formed by integrally protruding a cylindrical embossing 15b on the surface thereof, and the surface is coated with a dispersion plating treatment with a lubricating substance to improve sliding. 17 is a connector receiver fixed to the nut 14, with a flange 17a protruding from one end,
A screw 17b is carved on the outer peripheral surface of the other end. Reference numeral 18 denotes a connector retainer that is slidably inserted onto the outer periphery of the connector receiver 17, and a connector insertion hole 19 that allows the embossing 15b of the connector 15 to be inserted between the end surface of the connector receiver 17 facing the flange 17a. is formed. 2
Reference numerals 0 and 20 designate retainer nuts screwed onto the screws 17b of the connector retainer 17, and an O-ring 21 made of an elastic material is compressed between the connector retainer 18 and the connector retainer 17 is inserted between the connector retainer 17 and the connector retainer 18. The embossment 15b of the connector 15 is held in the entry hole 19 with an appropriate preload. The nut 14 is prevented from rotating in response to the rotation of the feed screw 13, but the nut 14 prevents the nut 14 from moving in the Y-Y direction within the radial plane due to the rotation of the feed screw 13. The pressure is adjusted and combined to allow relative movement. Furthermore, 22,
Reference numeral 22 denotes a lubricating sheet interposed between the connector 15 and the guides 16, 16 to improve sliding movement between the connector 15 and the guides 16, 16.

In this slide table device, when the feed screw 13 is rotated, the rotational force is converted into an axial thrust by the nut 14, and the connector receiver 17, the connector retainer 18, the O-ring 21, and the retainer nuts 20, 20 convert the rotational force into an axial thrust. The table 11 is moved linearly via the connector 15. and,
Even if the feed screw 13 swings around due to warpage, bending, etc., the vibration is transmitted to the nut 14 and connector 15.
In addition, the connector 15 and the table 11 are arranged in the X-X direction and the Y- direction of the radial plane of the feed screw 13, respectively.
It is absorbed by relative movement in the Y direction, and forces other than those in the axial direction of the feed screw 13 are not transmitted to the table 11. This action is schematically shown in FIGS. 3 to 6. In reality, the nut 14 and the connector receiver 17 fixed thereto revolve around the pivot center 0 of the feed screw 13. In the drawing, the center of swing of the feed screw 13 is 0 at every 90° rotation angle.
The figure shows how the connector receiver 17 changes its position relative to the other side. According to this, connector receiver 1
7 moves in the XX direction within the radial plane of the feed screw 13, the connector 15 moves in the XX direction with respect to the table 11.
2 (see Figures 4 and 6), and when the connector receiver 17 moves in the Y-Y direction within the radial plane of the feed screw 13, the connector receiver 17 moves relative to the connector 15 in the Y-Y direction (see FIGS. 3 and 5), and it can be seen that the vibration of the nut 14 due to the swing of the feed screw 13 is not transmitted to the table 11.

On the other hand, the feeding direction of the feed screw 13 and the table 11
Even if there is some error in the parallelism with the direction in which the table is trying to advance, the connector 15 can be moved in the direction perpendicular to the feeding direction of the feed screw 13, eliminating the influence of the parallelism error on the straightness of the table. be able to.

Effects of the invention According to the slide table device of this invention, even if the nut 14 is vibrated due to the oscillation of the axis when the feed screw 13 rotates, the force other than in the axial direction of the feed screw 13 is absorbed and the table 11 Therefore, the straightness of the table 11 is not adversely affected, and extremely good feeding accuracy can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of the main part of the slide table device of this invention, Fig. 2 is a partially exploded perspective view of Fig. 1, and Figs. 3 to 6 schematically show the operation of this invention. FIG. 7 is a side view of a main part of a conventional slide table device, and FIG. 8 is a schematic diagram showing the occurrence of vibration in a nut due to rotation of a feed screw. 11...Table, 12...Magnet, 13
...Feed screw, 14...Nut, 15...Connector, 16, 16...Guide, 17...Connector holder, 18...Connector presser, 19...Connector insertion hole, 20,20...Press nut, 21
...O-ring.

Claims (1)

[Scope of utility model registration request] In a slide table device in which a table is moved in the axial direction of the feed screw by a feed mechanism consisting of a feed screw and a nut screwed into the feed screw, a magnet is embedded in the underside of the table,
The suction force of this magnet attracts the rectangular part of the connector, which is formed by vertically vertically cylindrical embossing on a rectangular block, so that it can move in a direction perpendicular to the direction of movement of the table, and fixes it to the nut. The embossment of the connector is slidably held in the axial direction between the connector holder and the connector holder that is slidably inserted into the connector holder.
Furthermore, the slide table device is characterized in that the connector retainer is pressed against the connector with an appropriate preload via an elastic body by a retainer nut screwed onto a screw provided at the end of the connector receiver.