JPH0513782B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotary indexing device for indexing a rotary table at a predetermined angle.

[Prior art]

2. Description of the Related Art Devices in which a rotatable table is rotated by a predetermined amount and then kept stationary are often used in assembly machines, processing machines, and the like. Such devices include Geneva type devices that use cams, and devices that have a clutch on the table rotation shaft and rotate this shaft with a hydraulic motor via gears (for example, the
A rotary indexing board disclosed in Japanese Patent No. 48-13882 is known.

[Problems to be solved by the present invention]

However, in the above conventional example, it is unavoidable that a certain amount of play occurs in the Geneva or gear, making it impossible to smoothly control the speed.
In order to improve the indexing accuracy, it is necessary to provide some kind of clamping means. Taking these points into consideration, in the clutch and hydraulic motor described above, the rotary table is moved in the axial direction, and in conjunction with the clutch, its tapered surface engages with the tapered surface of the fixed base to generate clamping force. That's what I do. However, when the rotary table is moved in the axial direction, the amount of movement is not constant and tends to deviate, resulting in a drawback that the clamping force is not stable.

The present invention solves the drawbacks of the conventional example described above, that is, although it is a rotary indexing device that moves the rotary table in the axial direction, it is capable of accurately regulating the axial position of the rotary table. The purpose of this invention is to provide a rotary indexing device that can provide a stable clamping force.

[Means for solving problems]

In order to solve the above problems, in the present invention, a rotary indexing device includes a first member that has a stator and is movable in the axial direction, and a first member that is concentric with and opposed to the stator. the first
a second member rotatably supported by the member; and a third member supporting the first member via an elastic body that allows movement in the axial direction but prevents rotation. The second member further includes a contact surface capable of contacting the friction surface of the third member, and allows movement of the first member between the third member and the first member. A closed room was set up.

[Effect]

When the second member is stopped, that is, when it is not indexed, displacement in the rotational direction is prevented by the diaphragm, and the contact surface engages with the friction surface of the third member, so that it is clamped in that position, while the second member is not indexed. Sometimes, by supplying pressure fluid to the sealed chamber from the outside, the diaphragm is moved in the axial direction by elastic deformation, and the abutment surface is separated from the friction surface, thereby making it possible to rotate.

〔Example〕

Examples of this study will be described below with reference to the drawings. As shown in FIG. 1, the table indexing device includes a main body 10 that is disposed in a fixed position, and a pair of stators 38 and 68 that are movable in the axial direction (left and right directions in the drawing) with respect to the main body 10. The main body 10 and the housing 20
a diaphragm 80 interposed between the two rotors, a rotor 84 rotatably disposed between the two rotors, an index table 90 fixed to the rotor, and a rotor 84 for moving the motor housing 20 in the axial direction. It includes a fluid pressure chamber 100, which is a sealed chamber.

The main body 10 constituting the third member includes a hollow disc-shaped member 12 and a stepped portion 14 attached to the outer circumference of the member 12.
It consists of a cylindrical member 16 having a cylindrical shape and a cup-shaped guide member 18 attached to the inner circumference of the member 12. Motor housing 20 constituting the first member
has a generally U-shaped annular recess formed by a small diameter portion 22, a large diameter portion 24, and a radial portion 26 connecting the two. The small diameter portion 22 is fitted on the outside of the guide member 18, and the motor housing 20 is movable in the axial direction with respect to the main body 10 by elastic deformation of the diaphragm 80. A cross roller bearing 32 is attached to the outer circumferential surface of the other end of the small diameter portion 22, and is held at the attachment position by a holding member 34. Also,
A stator 38 having a coil 36 is fixed to the outer peripheral surface of the small diameter portion 22 .

On the other hand, the large diameter portion 24 is a part 42 of the housing body.
, a cylindrical member 54 fixed to this, a member 56 having an L-shaped cross section fixed to this, and a side cover 58 fixed to this. A plurality of recesses 62 are formed on the outer circumferential surface of one end of the large diameter portion 24, and compression springs 64 are spaced apart in the circumferential direction between the recesses 62 and the opposing step portions 14 of the member 16. has been done. The stator 3 is provided on the inner peripheral surface of the large diameter portion 24.
A stator 68 having a coil 66 is fixedly disposed opposite to the coil 66, a magnetic shield plate 72 is fixedly attached to the side of the coil 66, and a synchronizing stator 76 having a coil 74 is fixedly attached to the side thereof. It is set up. A seal 78 is attached to the inner peripheral edge of the side lid 58.

One end surface of the small diameter portion 22 of the motor housing 20 and the stepped portion 14 of the member 16 of the main body 10 are located on substantially the same plane in the axial direction, and a hollow disk-shaped diaphragm forming an elastic body is located between them. 80 is interposed, and its inner peripheral edge and outer peripheral edge are fixed to the small diameter portion 22 and the stepped portion 14, respectively. The diaphragm 80 allows the housing 20 to move slightly in the axial direction (left-right direction in FIG. 1) with respect to the main body 10, but prevents relative rotation. Large diameter part 2
An annular stopper portion 82 is provided on the outer peripheral side of the recess 62 of No. 4.
is formed, which can come into contact with the inner end surface of the stepped portion 14.

A rotor 8 is provided between the stators 38 and 68.
A rotor 84 is rotatably supported by the cross roller bearing 32 and fixed to an annular output shaft 86 sealed by a seal 78. A synchro rotor 88 is fixedly provided on the outer peripheral surface of the output shaft 86 so as to face the synchro stator 76 . A disc-shaped indexing table 90 is fixed to the output shaft 86 so as to rotate in a substantially vertical plane. The rotor 84, output shaft 86, and table 90 constitute a second member. table 90
The member 16 of the main body 10 has tapered portions 94 and 96 that are engageable with each other.

Oil is supplied into the fluid pressure chamber 100 defined by the radial portion of the small diameter portion 22 and the left end wall portion of the guide member 18 through an oil supply hole 101 and a conduit 103. The circuit is shown in FIG. The hydraulic circuit includes a 4-port 2-position hydraulic valve 102 and a hydraulic tank 104.
and a hydraulic pump 106.

Next, the functions and effects of this embodiment will be explained.

This indexing device is operated so that the table 90 is on top, and when the indexing table 90 is stopped, the hydraulic valve 102 is switched to the position shown in FIG. Not supplied. Therefore, the motor housing 20 is guided by the guide member 18 and moved to the right in FIG. 1 due to the action of the compression spring 64 and its own weight.
This movement is allowed by the diaphragm 80.
Since the table 90 moves together with the housing 20 and the tapered portion 94 engages with the tapered portion 96, the table 90 is held in a stopped state by the wedge action between them. The tapered parts 94 and 96 are the table 90
Since it is located quite far from the center of rotation, the braking force obtained at this time is large.

When indexing the table 90, the hydraulic valve 102 is switched to the position side. Then tank 10
4 is supplied into the fluid pressure chamber 100 by the pump 106, and the motor housing 20 is moved leftward in FIG. 1 by the pressure inside the fluid pressure chamber 100. This movement of the housing 20 is carried out by the diaphragm 8.
Allowed by 0. At this time, the output shaft 86, index table 90, etc. are moved integrally in the same direction,
The tapered portion 96 separates from the tapered portion 94, and the table 90 becomes rotatable. Therefore, the rotor 84 rotates due to the known electromagnetic action generated between the stators 38 and 68 and the rotor 84, and the indexing table 90 rotates by a predetermined amount via the output shaft 86, thereby performing indexing. That will happen. The housing 20 is connected to the main body 10 by a diaphragm 80 and is not rotated around the table 90. The amount of rotation of the table 90, that is, the rotor 84, is controlled by the synchronizing stator 74 and rotor 88. In addition, by arranging the magnetic shield plate 72, leakage magnetic flux between the stators 38 and 68 and the rotor 84 is reduced.
8 is prevented from reaching 8. Also housing 2
0 is regulated by the stopper portion 82 coming into contact with the inner end surface of the stepped portion 14 .

When the indexing of the table 90 is completed, the hydraulic valve 102 is switched to the position side, and the table 90 stopped by the above-described action is held at that position.

According to this embodiment, the motor housing 20 is coupled to the main body 10 in such a manner that it can move slightly in the axial direction by the diaphragm 80 but cannot rotate relative to the motor housing 20, so that the motor housing 20 is integrated with the housing 20 by the action of the diaphragm 80. The table 90 is now able to accurately occupy the index and stop positions, and the disengagement and engagement of the tapered portions 94 and 96 is ensured. In addition, the stators 38 and 6
Since the table 90 is directly pulse-driven by an electromagnetic motor consisting of a rotor 84 and a rotor 84, the table 90 is
0 can be accurately rotated by a desired amount for indexing.

When the above indexing device is applied to a machine tool that performs heavy cutting, there is a synchronizer device that detects the rotation angle of the electromagnetic motor, so even if a strip occurs on the table 90, an alarm will be issued and the indexing will be performed. You should try again. In normal work, if the motor current is cut off after indexing the table 90, no heat will be generated and energy will be saved.

The present invention should not be construed as being limited to the above-mentioned embodiments, but may be modified as appropriate within the scope of the invention. For example, since the housing 20 will descend under its own weight even without the compression spring 64, the spring 64 is not essential if the table holding force is small. Further, the specific configurations of the diaphragm 80 and the tapered portions 94 and 96 can be changed as desired.

[Effect of idea]

As described above, according to the present invention, in the rotary indexing device, the rotary table can be accurately positioned at the indexing device and the stop position with a simple structure, thereby increasing the indexing amount. The advantage is that it is possible to obtain an indexing device that can arbitrarily select the index and that does not accumulate indexing errors.

Further, according to the embodiment, since the table 90 is pulse-driven by the pulse motors 38, 68, and 84, the indexing amount can be controlled extremely accurately. The clamping portion utilizes the tapered portions 94 and 96 and is formed at a considerable distance from the center of rotation, so that a large clamping force can be obtained despite the simple structure. In addition, in the case where a pair of inner and outer stators 38 and 68 are provided, a rotary indexing device having a compact structure and a large torque can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a front view (half sectional view) showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing a hydraulic circuit of the above embodiment. [Explanation of symbols of main parts], 12, 14...Third member, 20... First member, 38, 68...
Stator, 80...elastic body, 86, 90...second
member, 94... contact surface, 96... friction surface, 10
0... Closed room.

Claims (1)

[Scope of Claims] 1. A first member having an annular stator and movable in an axial direction, and a circumferential surface of the first member that faces the circumferential surface of the stator and is arranged concentrically with the stator. a second member rotatably supported by the first member; and a second member that allows axial displacement of the first member but prevents rotation with respect to the rotation axis center line of the second member. a third member supporting the first member by an elastic body;
The second member has a contact surface that is urged by the elastic body and engages a friction surface provided on the third member, and the third member and the first member A sealed chamber that allows the first member to be displaced in the axial direction is provided between the first member and the first member, and the first member is moved in the axial direction by supplying fluid pressure to the sealed chamber from the outside, and the contact surface thereof A rotary indexing device characterized in that it is possible to separate the friction surface of the third member from the friction surface of the third member.