JP2757116B2 - Index table device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an index table apparatus, and more particularly, to a drive motor disposed substantially on the lower surface side of a table body of an index table, the index table being vertically rotated via a drive gear and a ring gear. The present invention relates to an index table device that rotates around a center.

[0002]

2. Description of the Related Art Generally, an index table device is
In order to place the work on the table body of the index table via the jig, rotate the index table by the rotation drive means and stop it at the predetermined work position, and perform machining such as machining on the work at the predetermined work position It is used. As a conventional index table device, for example, there is one described below. As an example, a drive motor is arranged outside the index table, and an index mechanism for converting the rotation direction from a horizontal direction to a vertical direction and rotating at a reduced speed is installed on the lower surface side of the index table. Are provided, and a chain or a belt is bridged between these sprockets, and the drive of the drive motor rotates the index table via an index mechanism.The vertical load of this index table is applied to the index table. There is an index table device configured to be supported by a plurality of support rollers provided on the lower surface side.

As another example, a rotary drive including a drive motor and a speed reducer is disposed outside an index table, and a shaft member disposed at a rotation axis of the index table and fixed to a stationary frame is provided with an index member. The table is rotatably supported via bearings, a body is formed to project downward from the lower surface of the index table, and a rotating shaft member having two upper and lower sprockets is installed near the body, The chain is mounted on the sprocket and the body, and the chain is mounted on the sprocket provided on the output shaft of the rotary drive and the lower sprocket of the rotary shaft member, and the sprocket is rotated by the rotary drive. The index table is configured to rotate through a chain, and the vertical load of this index table is applied to the index table. There is a configuration index table device to support a plurality of supporting rollers in contact with the lower surface of the table.

[0004]

However, in the former index table apparatus, a high index mechanism is arranged on the lower surface side of the index table, and the index table is supported by a plurality of large supporting rollers. For this reason, the height of the index table is high, and there has been a problem that the workability of this processing operation is deteriorated when processing a work placed on the index table. Further, the height of the work mounting surface of the jig mounted on the table body of the index table is set to about 850 mm to 1 mm.
In order to lower the index table device to about 050 mm, the lower part of the index table device was disposed in a recess formed in the floor, or a work deck for increasing a foothold of an operator was installed. There is a problem in that additional work such as installation of a work deck is required, and ancillary construction costs are required.

In addition, since a plurality of sprockets, chains or belts, and a plurality of support rollers are required,
There is a problem that the number of parts is large, the structure is complicated, and the manufacturing cost is high. In addition, since the drive motor is installed outside the index table, there is a problem that the installation space is increased accordingly. As described above, since the height is high and the installation space is required to be large, there is a problem that the entire apparatus becomes large. In the latter index table device, the height of the index table can be reduced, but a large rotary drive consisting of a drive motor and a reduction gear must be installed outside the index table, so a large installation space is required. There is a problem that the size is increased. Further, since sprockets, chains, support rollers, and the like are required, there is a problem that the number of parts is large, the structure is complicated, and the manufacturing cost is high.

In addition, since the rotary driving means is installed outside the index table, the work on the work cannot be performed at the installation location of the rotary driving means, so that the processing work place is limited and the work is difficult. There's a problem. An object of the present invention is to provide an index table device that can reduce the height of an index table, reduce the number of parts, simplify the structure, and reduce the manufacturing cost.

[0007]

According to a first aspect of the present invention, there is provided an index table apparatus, comprising: an index table for mounting a work; and a table support mechanism for rotatably supporting the index table around a vertical rotation axis. A rotation driving means for rotating the index table, wherein the rotation driving means is disposed concentrically with the rotation axis and fixed to the leg of the index table, A ring gear having gear teeth, a drive gear having a smaller diameter than the ring gear, disposed inside the ring gear and concentric with the rotation axis, and meshed with the ring gear via an intermediate gear; and a table body of the index table Is disposed substantially on the lower surface side and above the ring gear and is fixed to the stationary frame,
An electric motor for rotating a drive gear, wherein the table support mechanism includes an inner ring member integrally fixed to an outer peripheral portion of the ring gear, and a slewing ring bearing disposed on the outer peripheral portion of the inner ring member. The outer ring is provided on the outer peripheral portion of the inner ring member via a slewing ring bearing and fixed to a stationary frame, and the inner ring member is rotatably supported via the slewing ring bearing so as not to move vertically. And an outer ring member for supporting a vertical load transmitted from the inner ring member.

The electric motor comprises a motor with a speed reducer in which a motor body and a speed reducer are directly connected coaxially. The electric motor and a drive gear are vertically arranged in series to form an electric motor. A drive gear may be directly connected to the output shaft (claim 2 dependent on claim 1). An opening for inserting the top of the electric motor may be formed at the center of the table body of the index table (claim 3 dependent on claim 2).

[0009] In here, the index table 1 or more at a predetermined rotational position may be provided with a positioning mechanism for positioning is stopped (the dependent claims to claim 1-3 any one of 4).

[0010]

In the index table apparatus according to the first aspect, the drive gear is driven to rotate by the drive of the electric motor of the rotary drive means, and the drive gear, the intermediate gear, and the ring gear constitute a reduction mechanism. Therefore, the ring gear is rotated at a reduced speed via the intermediate gear. By the rotation of the ring gear, the index table is rotated via the inner ring member. Since the index table is rotatably supported by a table support mechanism including an inner ring member, a slewing ring bearing, and an outer ring member, the index table is smoothly rotated. here,
The slewing bearing is a radial thrust bearing capable of supporting a large thrust force.

This index table device has a structure in which the index table is rotated by rotary driving means mainly composed of a ring gear, an intermediate gear, a drive gear, and an electric motor. Since it is rotatably supported by a table support mechanism mainly composed of an outer ring member, there is no need to install a high index mechanism and support rollers on the lower surface side of the index table. it can. Therefore, it is easy to perform a processing operation such as a mechanical processing on the work placed on the upper surface of the index table. Furthermore, since a sprocket, a chain or a belt, a plurality of support rollers, and the like are not required, the number of parts is small, the structure can be simplified, the manufacturing cost can be reduced, and the size can be reduced.

In the index table device according to the second aspect, since the electric motor is a motor with a speed reducer in which the motor body and the speed reducer are directly connected coaxially, the structure can be simplified and the electric motor can be simplified. Since the rotational driving force of the main body can be reduced by the driving gear, the intermediate gear and the ring gear, the reduction gear of the electric motor can be downsized. Furthermore, since the drive gear is directly connected to the output shaft of the electric motor, the number of parts can be reduced. In the index table device according to the third aspect, since the opening for inserting the top of the electric motor is formed in the center of the table main body of the index table, the height of the table main body of the index table is set to the top of the electric motor. Can be lower. Further, since the electric motor can be removed from this opening, maintenance is easy.

[0013] In the index table device according to 請 Motomeko 4, by the positioning mechanism, so it can be positioned to stop the index table 1 or more at a predetermined rotational position, it is possible to perform accurate positioning and fixing of the index table, Rotational movement of the index table during work processing can be prevented.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an index table device according to the present invention will be described below with reference to the drawings. FIG.
As shown in FIG. 3, the index table device 1
A flat base plate 10 installed on the floor, an index table 20 having a table body 21 having an opening 21a formed at the center, a rotary drive mechanism 30 for rotating and driving the index table 20, and an index table 20 A table support mechanism 50 that rotatably supports the table,
And a positioning mechanism 70 for stopping the rotation of the index table 20 at a predetermined rotation position for positioning.

The rotary drive mechanism 30 is disposed concentrically with the vertical rotation axis X of the index table 20, is fixed to the cylindrical leg 22 of the index table 20, and has gear teeth on the inner periphery. A ring gear 37, a drive gear 34 having a smaller diameter than the ring gear 37, disposed inside the ring gear 37 concentrically with the rotation axis X, and meshed with the ring gear 37 via the intermediate gear 38; It is disposed substantially on the lower surface side of the main body 21 and above the ring gear 37 and is fixed to the base plate 10. The top 31 is inserted into the opening 21 a of the table main body 21 of the index table 20, and drives the driving gear 33 to rotate. And a forward / reverse electric motor 33 with a brake.

The table support mechanism 50 includes an inner ring member 5 integrally fixed to an outer peripheral portion of the ring gear 37.
1, a slewing ring bearing 52 disposed on the outer peripheral portion of the inner ring member 51, and an outer fitting disposed on the outer peripheral portion of the inner ring member 51 via the slewing ring bearing 52, and fixed to the base plate 10. And an outer ring member 53. Here, the slewing bearing 52 is a radial thrust bearing capable of supporting a large thrust force.

First, the index table 20 will be described in detail. As shown in FIGS. 1 and 2, an index table 20 includes a table body 21 having a quadrangular shape in plan view having an opening 21 a formed in the center,
1, a cylindrical leg 22 fixed to the lower surface side, and an opening 2
Eight reinforcing plates 23 provided radially and vertically from the opening edge of the opening 1a to the vicinity of the outer edge;
A reinforcing member 24 in the form of a square tube fixed to the lower surface of the table main body 21 over the entire area near the outer periphery of the table main body 21 of the index table 20;
An annular leg bottom plate 25 fixed to the lower end of the leg portion 22, two shaft members 71 fixed to a lower surface of the leg bottom plate 25 symmetrically with respect to the rotation axis X, and these shaft members 7.
1 and two positioning screws 72, which are rotatably mounted on the base 1 and two screws 79 on the upper surface of the leg bottom plate 25 at positions corresponding to the two rollers 72, respectively, and various proximity switches 75, 76, 77, Section L for actuating 78
And a switch operating plate 73 in the shape of a letter. Note that the shaft member 71, the positioning roller 72, and the switch operating plate 73 constitute a part of a positioning mechanism 70 described later.

Further, the leg bottom plate 25 is provided with a through hole 27 for inserting a driver for screwing and retracting a mounting bolt 54 for fixing the outer ring member 53 to the base plate 10. A cover 28 for protecting the electric motor 33 is attached to the opening 21 of the index table 20 with the top 31 of the electric motor 33 inserted. A work W to be machined is placed on the index table 20, as indicated by a virtual line in FIG.

Next, the rotation drive mechanism 30 will be described in detail. The ring gear 37 includes an inner ring member 51.
The inner ring member 5 is integrally fixed to the inner peripheral portion of the inner ring member 5.
1 is fixed to a leg bottom plate 25 at the lower end of the leg portion 22 of the index table 20 with a mounting bolt 55. The drive gear 34 has an output shaft 32 of the electric motor 33 in its shaft insertion hole.
Is inserted so as to be able to transmit a rotational force, and is held by a retaining plate 39 fitted to the lower end of the output shaft 32. The diameter of the drive gear 34 is about 1 / the diameter of the ring gear 37.
3 dimensions. Therefore, the rotation speed of the ring gear 37 rotated via the intermediate gear 38 by the rotation of the drive gear 34 is reduced to about １ ／ of the rotation speed of the drive gear 34. .

The electric motor 33 is composed of a motor with a speed reducer in which a motor body 35 and a speed reducer 36 are directly connected coaxially. The speed reducer 36 reduces the rotation speed of the motor body 35 to 1/60 and reduces the output shaft 32. The rotation of the drive gear 34 is reduced through the rotation of the drive gear 34. Therefore, the rotation speed of the ring gear 37 is about 1/180 of the rotation speed of the motor body 45, and the rotation speed of the ring carrier 37 is greatly reduced. Further, most of the main body of the electric motor 33 is disposed below the opening 21 a of the table main body 21 of the index table 20 and is fixed to the base plate 10 via the support frame 11. A drive gear 34 driven by an electric motor 33 is provided inside the support frame 11.

The intermediate gear 38 is disposed between the ring gear 37 and the drive gear 34, and its support shaft 42 is
1 is fixedly supported by a pair of upper and lower support plates 12 and 13 having one end fixed to the gear body 1, and a gear body 46 is rotatably supported on the support shaft 42 via a bearing 45. Accordingly, the gear teeth of the intermediate gear 38 mesh with the gear teeth of the drive gear 34, and the gear teeth of the ring gear 37 mesh with the gear teeth of the intermediate gear 38. Ring gear 3
7 is rotated, and the ring gear 37 is configured to be rotated at a reduced speed via the intermediate gear 38 by the rotation of the drive gear 34.

Next, the table support mechanism 50 will be described in detail. As described above, in the inner ring member 51, the ring gear 37 is integrally fixed to the inner peripheral portion, and the outer peripheral portion has a circumferential groove 56 having a semicircular cross section into which the plurality of steel balls 59 of the slewing ring bearing 52 enter. Is formed. The outer ring member 53 includes the inner ring member 5.
The outer peripheral portion of the first base plate 10 is disposed in an outer fitting state with a slewing bearing 52 interposed therebetween, and is fixed to a ring-shaped fixing member 14 fixed to the upper surface of the base plate 10 by a plurality of mounting bolts 54. . The outer ring member 53 has a circumferential groove 58 having a semicircular cross section in which a plurality of steel balls 59 of the slewing ring bearing 52 enter in an inner peripheral portion thereof. As shown in FIG. 4, the slewing ring bearing 52 is configured such that a plurality of steel balls 59 are formed by a circumferential groove 56 of an inner ring member 51 and an outer ring member 53.
Is rotatably mounted on the peripheral groove 58 of the index table 20 to rotatably support the inner ring member 51.
Are supported rotatably and immovable in the vertical direction. still,
In FIG. 4, reference numerals 60 and 61 are sealing materials. Furthermore, the base plate 10, the support frame 11, and the support plates 12, 13
The fixing member 14 corresponds to a stationary frame.

Next, the positioning mechanism 70 will be described in detail. The positioning mechanism 70 includes a shaft member 71 on the lower surface of the leg bottom plate 25 at the lower end of the leg portion 22 of the index table 20.
And two positioning rollers 72 rotatably supported via the rotary shaft center X and symmetrically positioned at positions corresponding to the two rollers 72 on the upper surface of the leg bottom plate 25, respectively. A stop position confirmation proximity switch 75 attached to the upper end of a plurality of L-shaped support plates 74 erected at a plurality of predetermined locations on the upper surface of the base plate 10, and a pair of stop commands near both sides thereof Proximity switch 76, a pair of deceleration proximity switches 77, 78 disposed at predetermined intervals on both sides in the circumferential direction with respect to the stop position confirmation switch 75, and a diametric direction with respect to the stop position confirmation switch 75. Roller clamping stop mechanism 8 installed on the opposite side
0.

As shown in FIGS. 1 and 3, a base plate 81 having an L-shape as viewed from the front is fixed to the base plate 10 with a plurality of screws, and a pair of upper and lower support plates 83 and 84 are formed. The pair of arms 87 are horizontally projecting from the vertical portion 82 of the base plate 81 at predetermined intervals in the vertical direction toward the opening side. Movably pivotally connected to the piston rod 90
Is connected to the vicinity of the tip of the arm 87, and the cylinder bodies 95 of the two air cylinders 92 are respectively provided obliquely outwardly. When the piston rod 90 advances and retreats by the driving of the two air cylinders 92, the two arms 87 are opened and closed at their distal ends centering on pivotal portions with respect to the support plates 83 and 84, and are closed for positioning. Hold the roller 72,
The configuration is such that the index table 20 is fixed.

At the base ends of the cylinder bodies 95 of the two air cylinders 92, connecting fittings 94 are respectively provided in a protruding manner, and these connecting fittings 94 are fixed to the base plate 10 by a plurality of screws. A connecting tool 91 is also provided at the tip of the piston rod 90 so as to be rotatable on the substrate 93, respectively. The connecting tool 91 is connected to a position near the tip of the arm 87. In FIG. 3, reference numeral 89 denotes the support plate 8.
4 is a disc-shaped regulating member for regulating the opening state of the two arms 87 in the closed state so as to be in the small opening state when the positioning roller 72 is sandwiched therebetween.

Next, the operation of the index table device will be described. After the jig J is placed on the upper surface of the index table 20 and the work W is fixed to the jig J, and the electric motor 33 is driven, the output shaft 32 is decelerated by the speed reducer 36 and the output shaft 32 is rotationally driven. The drive gear 34 fixed to the shaft 32 rotates. The rotation of the drive gear 34 is transmitted to the ring gear 37 via the intermediate gear 38,
This ring gear 37 rotates at a low speed. Ring gear 37
, The inner ring member 51 is rotationally driven via the slewing bearing 52, and the index table 2 is rotated.
0 is rotationally driven.

When the index table 20 is rotated and the work W placed on the upper surface of the index table 20 approaches a predetermined working position, the deceleration proximity switch 77 or 78 is operated by the switch operating plate 73 on the upper surface of the leg bottom plate 25. Is O
N, the electric motor 33 is rotated at a reduced speed. Further, when the index table 20 is rotated, the stop command switch 76 is turned on by the switch operating plate 73, and the brake of the electric motor 33 is operated to stop the rotation drive. Cylinder 92
The piston rod 90 moves forward and the two arms 87 are closed to the position regulated by the regulating member 89, and the positioning roller 72 is sandwiched between the two arms 87 to fix the index table 20. Thereafter, the brake of the electric motor 33 may be operated. With the index table 20 stopped and the stop position confirmation proximity switch 75 turned on by the switch operating plate 73, the workpiece W on the jig J placed on the upper surface of the index table 20 is machined by a machine tool. Is applied.

The index table device 1 has a rotary drive mechanism 30 mainly composed of a ring gear 37, an intermediate gear 38, a drive gear 34, and an electric motor 33, and rotates the index table 20. The index table 20 supports the table. Since it is rotatably supported by the mechanism 50, there is no need to install a high index mechanism and a supporting roller on the lower surface side of the index table 20, and the height of the index table 20 can be reduced (a height of about 350 mm or less). Can be). Therefore, machining of the work W placed on the index table 20 can be easily performed. Furthermore, since a sprocket, a chain or a belt, a plurality of support rollers, and the like are not required, the number of parts is small, the structure can be simplified, the manufacturing cost can be reduced, and the size can be reduced.

In addition, the electric motor 33 is
And a speed reducer 36 which is directly connected coaxially with a speed reducer, so that the rotational speed of the motor body 35 can be reduced by the speed reducer 36 and the speed reduction comprises the drive gear 34, the intermediate gear 38 and the ring gear 37. The rotation speed of the index table 20 can be significantly reduced (about 1 to 1) with respect to the rotation speed of the motor body 35 of the electric motor 33 by the mechanism.
(/ 180) The rotational speed can be reduced, and the speed reducer 36 of the electric motor 33 can be reduced in size. Further, since the drive gear 34 is directly connected to the output shaft 32 of the electric motor 33, the number of parts can be reduced. Since the electric motor 33 can be driven forward and reverse, the electric motor 33 is driven forward and reverse in accordance with the direction of machining to move the index table 20 in the forward or reverse direction. , And can be stopped and fixed at the most suitable position, thereby improving workability.

Since the opening 21 for inserting the top 31 of the electric motor 33 is formed at the center of the index table 20, the height of the index table 20 can be made lower than the top 31 of the electric motor 33. Further, since the electric motor 33 can be removed from the opening 21,
Easy maintenance. The positioning mechanism 70 fixes the index table 20 by clamping the positioning roller 72 supported by the leg bottom plate 25 at the lower end of the leg 22 of the index table 20 via the shaft member 71 with the roller clamping stop mechanism 80. Since the positioning is performed, accurate positioning and fixing can be performed. Therefore, it is possible to prevent the index table 20 from rotating when the workpiece is processed.

Further, when the rotation of the index table 20 is stopped, the electric motor 33 is first decelerated and rotated by turning on the deceleration proximity switch 77 or 78, and then the brake of the electric motor 33 is operated by turning on the stop command switch 76. Since the rotation drive is stopped, the rotation of the index table 20 can be gently stopped, and unnecessary load is not applied to the electric motor 33 when the rotation is stopped. Thus, the proximity switches 75, 7
6, 77, 78, the switch becomes a non-contact structure, and the switch itself is damaged and these proximity switches 75, 76, 7
It is possible to prevent the equipment related to 7, 78 from being damaged. Since the index table 20 can be a welded structure of a cylindrical member forming the leg portion 22, a rectangular tubular reinforcing member 24, and an iron plate forming the index table 20, the index table apparatus 1 is inexpensive and lightweight. Can be provided.

[0032] Next, an explanation will be made about modified embodiments of the index table device according to the present invention. 1) The inner ring member 51 may be formed as a member separate from the ring gear 37, and the inner ring member 51 may be integrally fixed to the outer peripheral portion of the ring gear 37. 2] The diameter of the electric motor 33 in FIG. 1 may be increased, the height may be reduced, and the opening 21a may be omitted. 3) The electric motor 33 in FIG. 1 may be constituted by a servomotor, and the positioning mechanism 70 may be omitted. 4] The number of the positioning rollers 72 in FIG. 1 is not limited to two. For example, 4n (n = 1, 2, 3,...)
・) May be provided. In this case, the switch operating plate 7 is provided at a position corresponding to the roller 72 on the upper surface of the leg bottom plate 25, respectively.
3 is fixed.

5 ] The use of the index table device is not limited to the machining of the work W, but may be used for various processing operations, assembling operations, inspection operations, and the like. 6 ] In the above embodiment, as the electric motor 33,
Although a description has been given of a motor that can rotate forward and reverse, the invention is not limited to this, and an electric motor that rotates only in the same direction may be used to rotate the motor by a predetermined rotation angle in the same direction.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an index table device according to an embodiment of the present invention.

2 is a partially omitted reduced plan view of the index table device of FIG. 1;

FIG. 3 is a plan sectional view taken along line AA of the index table device of FIG. 1;

FIG. 4 is an enlarged vertical sectional view of a slewing bearing of the index table device of FIG. 1 ;

[Explanation of symbols]

W workpiece 1 Lee emissions index table device 1 0 base over the scan board 11 support frame 2 0 Lee emissions index table 21 table body 21a opening 22 leg portion 30 rotary drive mechanism 3 3 electrodeposition dynamic motor 3 4WD driven gear 35 Motor body 3 6 down the speed 37 ring gear 38 intermediate gear 50 the table support mechanism 5 1 Lee N'naringu member 5 2 handed Roll the cell culture bearing 5 3 A Utaringu member 70 positioning mechanism

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 60-45647 (JP, U) JP-A 59-62950 (JP, U) JP-A 4-79042 (JP, U) JP-A 62- 110844 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) B23Q 1/00-1/76 B23Q 16/06 B23Q 39/04

Claims (4)

(57) [Claims] An index table for mounting a work, a table support mechanism for rotatably supporting the index table around a vertical rotation axis, and a rotation driving means for driving the index table to rotate. In the index table device, the rotation driving means is disposed concentrically with the rotation axis, is fixed to a leg of the index table, has a ring gear having gear teeth on an inner peripheral portion, and has a smaller diameter than the ring gear, A drive gear disposed concentrically with the rotation axis inside the ring gear and meshed with the ring gear via an intermediate gear; and a drive gear disposed substantially on the lower surface side of the table body of the index table and above the ring gear. An electric motor fixed to a stationary frame and configured to rotationally drive a driving gear, wherein the table support mechanism includes: An inner ring member integrally fixed to an outer peripheral portion of the ring gear; a slewing ring bearing disposed on the outer peripheral portion of the inner ring member; and an outer fitting shape formed on the outer peripheral portion of the inner ring member via a slewing ring bearing. And an outer ring member that is fixed to the stationary frame, supports the inner ring member rotatably and vertically immovably via a slewing ring bearing, and supports a vertical load transmitted from the inner ring member. An index table device comprising: 2. The electric motor according to claim 1, wherein the electric motor comprises a motor with a speed reducer in which a motor body and a speed reducer are directly coaxially connected. The electric motor and a drive gear are vertically arranged in series to output the electric motor. The index table device according to claim 1, wherein a drive gear is directly connected to the shaft. 3. The index table apparatus according to claim 2, wherein an opening for inserting a top of the electric motor is formed in a center portion of the table body of the index table. 4. The index table according to any one of claims 1-3, characterized in that a positioning mechanism for positioning by stopping the index table 1 or more at a predetermined rotational position.