JPH07185724A - Positioning device - Google Patents

Abstract

PURPOSE:To prevent damage of a work when the circular work having a protrusion on its outer circumference is surely and rapidly set in a specific direction. CONSTITUTION:The work 1 is mounted on a table 22. The work 1 is clamped by the chuck 51 of a handling robot 52 for carriage. The work 1 is held from above by an upper holding part 55 of chuck 51 and the inside circumferential surface of work 1 is held by a horizontal holding part 69 of chuck 51 which is moved in other way from the upper holding part 55. A key 36 is elevated to the table 22 and rotated forward and backward by 90 deg.. Thus, the protrusion 2 of work 1 is pushed to a specific position by the key 36 and the work 1 is positioned. The work 1 is weakly held when it is positioned and strong held when it is carried after positioning by the chuck 51. A driving source of the table 22 and key 36 is supported on a vertical moving plate 14 and the plate 14 is pushed up by a hydraulic cylinder 15. Thus, various height of work 1 is countermeasured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positioning device for rotating an annular work having a projection projecting in a radial direction and orienting the work so that the projection comes to a predetermined position. In the case of (1), the work to be forged is used when it is conveyed from the heating furnace to the forging press.

[0002]

2. Description of the Related Art FIG. 8 shows an example of a sintered forged body. This sintered forged body is an outer race 1 which is a transmission part of an automobile, has an annular shape, and has a plurality of protrusions 2 on its outer peripheral surface. These protrusions 2 are 3
The outer races 1 are distributed in four groups one by one, and as a result, the outer race 1 has a planar shape having four symmetry axes. When manufacturing the outer race 1 which is such a sintered forged body, for example, first, a raw material powder containing a metal as a main component is molded by a powder molding die (powder molding step),
The green compact after molding is heated and sintered in a sintering furnace (sintering step). Next, the temperature-reduced sintered body is reheated by a heating furnace (reheating step), and then the reheated sintered body is compressed by a forging die and forged (forging step). For example, a handling robot is used to convey the outer race 1 from the heating furnace to the forging die.

In the conventional positioning device, the outer race 1 reheated after sintering is conveyed to a horizontal table by a conveyer or the like, and a key located under the table is projected onto the table and horizontally rotated by a predetermined angle. To do. At this time, the key hits the protrusion 2 to rotate the outer race 1, and as a result, the protrusion 2 reaches a predetermined position, and the outer race 1 is oriented in a predetermined direction. Then, the handling robot grips the outer race 1 and conveys it to the forging die.

[0004]

As described above, conventionally, after the outer race 1 is aligned in the circumferential direction by the aligning device including the table and the key,
Since the outer race 1 is gripped and conveyed by the handling robot, there is a problem that it takes time. Then, for example, in sintering forging, if it takes a long time to convey the outer race 1 from the heating furnace to the forging press, the temperature decrease of the outer race 1 during that time becomes large.

The present invention is intended to solve such a problem, and is a positioning device for positioning an annular work having a projection protruding in the radial direction such as an outer race so as to be in a predetermined direction. In the above, by aligning the work while holding it by the transfer chuck, it is possible to quickly perform a series of operations for the alignment and the subsequent transport, and also to reliably position the work without damaging it. The purpose is to be able to.

[0006]

In order to achieve the above-mentioned object, the alignment device of the invention of claim 1 rotates an annular work having a projection protruding in the radial direction so that the projection comes to a predetermined position. In the alignment device for orienting the work as described above, a horizontal table on which the work is placed, a transfer chuck for rotatably gripping the work, and a work gripped by the chuck are projected on the table. A workpiece rotating mechanism for rotating the workpiece until it reaches a predetermined position, the chuck is configured to move the workpiece on the table from above and to move the workpiece in the radial direction independently of the upper holder. And a lateral pressing portion for holding the work in the radial direction.

In order to achieve the above-mentioned object, the aligning device of the invention of claim 2 rotates an annular work having a projection projecting in a radial direction and orients the work so that the projection comes to a predetermined position. In the positioning device to attach,
A horizontal table on which the work is placed, a transfer chuck for rotatably gripping the work, and a work rotating mechanism for rotating the work gripped by the chuck until a protrusion reaches a predetermined position on the table. The chuck has an upper pressing portion that presses the work on the table from above, and a horizontal pressing portion that moves in the radial direction of the work and holds the work from the inner peripheral side. A lift supporting a rotating mechanism is supported on a base so as to be vertically movable, and the lift is biased upward by a biasing mechanism with respect to the base.

In order to achieve the above-mentioned object, the aligning device of the third aspect of the present invention rotates an annular work having a projection protruding in the radial direction and orients the work so that the projection comes to a predetermined position. In the positioning device to attach,
A horizontal table on which the work is placed, a transfer chuck for rotatably gripping the work, and a work rotating mechanism for rotating the work gripped by the chuck until a protrusion reaches a predetermined position on the table. The work rotation mechanism has a key that is driven in the vertical direction to project and retract on the upper side of the table and rotate on the table to hit the protrusion of the work in the tangential direction of the rotation trajectory. The work is rotated twice forward and backward with respect to one work.

In order to achieve the above-mentioned object, the aligning device of the invention according to claim 4 rotates an annular work having a projection projecting in a radial direction and orients the work so that the projection comes to a predetermined position. In the positioning device to attach,
A horizontal table on which the work is placed, a transfer chuck for rotatably gripping the work, and a work rotating mechanism for rotating the work gripped by the chuck until a protrusion reaches a predetermined position on the table. The chuck includes a gripping force adjusting means for adjusting a gripping force of the chuck, a gripping force of the chuck is weakened when the work is rotated by the work rotating mechanism, and a grip of the chuck is conveyed when the work is conveyed by the chuck. And a control means for strengthening the force.

[0010]

In the positioning apparatus according to the first aspect of the invention, when the work is oriented in the predetermined direction, the work is first placed on the table and the work is gripped by the chuck.
In this chuck, the upper pressing part presses the work from above, and the lateral pressing part that operates independently of the upper pressing part moves in the radial direction of the work to hold the work in the radial direction. In this state, the work rotating mechanism rotates the work until the protrusion reaches a predetermined position, and the work is aligned. After this alignment, the chuck conveys the work.

In the positioning apparatus of the second aspect of the invention, the work is first placed on the table and gripped by the chuck. In this chuck, the upper holding portion holds the work from above, and the side holding portion holds the work in the radial direction. In this state, the work rotating mechanism rotates the work until the protrusion reaches a predetermined position. After this alignment, the chuck conveys the work. By the way, as described above, the upper pressing portion of the chuck presses the work on the table from above.However, when there are variations in the height of the work, the table and the work rotation mechanism are supported and the work is urged upward. By raising and lowering the elevating table, variations in the height of the work are absorbed, and the force for pressing the work in the vertical direction becomes relatively constant.

In the aligning apparatus of the third aspect of the invention, the work is first placed on the table and gripped by the chuck, and in this state, the work rotating mechanism rotates the work until the projection reaches the predetermined position. After this alignment, the chuck conveys the work. The work rotation mechanism is
After the work is gripped by the chuck, the key rises on the table and rotates. At this time, if the key is located off the protrusion of the work from the beginning, it immediately rises and enters the rotation trajectory of the protrusion, and if it is located below the protrusion, it will rotate to some extent and come off the protrusion. After that, it rises and enters the rotation trajectory of the protrusion. Then, after the key rotates at least to some extent, it hits the protrusion of the work from the tangential direction of the rotation trajectory and further rotates to a predetermined position. The key is then rotated in the opposite direction to a predetermined position, thereby orienting the workpiece with its projections in place.
In such a position alignment by the key, originally, the position should be able to be aligned only by rotating the key once, but there is a possibility that the key cannot be put on the rotation locus of the protrusion due to being caught. . On the other hand, by rotating the key twice normally and reversely, for example, even if the catch is not eliminated by the rotation in the forward direction, the catch is eliminated by the rotation in the reverse direction, so that the alignment is surely performed. become.

In the aligning apparatus according to the fourth aspect of the present invention, the work is first placed on the table and gripped by the chuck, and in this state, the work rotating mechanism rotates the work until the projection reaches the predetermined position. After this alignment, the chuck conveys the work. By the way, although the gripping force of the chuck is adjustable, when the work is rotated for the above-mentioned alignment, the work is gripped weakly, whereby the work can be rotated while slipping with respect to the chuck, and The work is prevented from being damaged by slippage. After that, when the work is conveyed, the chuck strongly grips the work, and the work is prevented from dropping from the chuck or the alignment state is disturbed during the conveyance.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the alignment apparatus of the present invention will be described below with reference to the drawings. The work 1 to be aligned in this embodiment is an outer race made of a sintered component as shown in FIG. 8 described above, which is before forging.

In FIG. 1, reference numeral 11 is a base plate as a base, and four ball bushes 12 are erected on the base plate 11 and these ball bushes are provided upright.
An elevating plate 14 as an elevating table is fixed to the upper ends of rods 13 supported by 12 so as to be vertically movable. Further, on the base plate 11, the lifting plate 14
Hydraulic cylinder 15 as a biasing mechanism that biases the cylinder upward
Is provided. That is, this fluid pressure cylinder 15
A vertically moving piston rod 16 is connected to the elevating plate 14 via a floating joint 17.
Further, a lower plate 19 is fixed on the elevating plate 14 via four columns 18. A side frame 21 is erected around the lower plate 19, and a table 22 is horizontally fixed on the side frame 21. This table 22
Is a work 1 whose axial direction is the vertical direction is placed on the upper surface.

A rotary actuator 23 is provided on the elevating plate 14, and the rotary actuator 23 has a rotary output shaft protruding upward.
Has 24. A bearing bush 25 is fixed to the lower plate 19 in a penetrating state, and a transmission shaft 29 is rotatably supported by the bearing bush 25 via bearings 26, 27 and a stop ring 28. The lower end of the transmission shaft 29 is connected to the rotary output shaft 24 of the rotary actuator 23 via a coupling 31. An intermediate plate 32 located in the side frame 21 is horizontally fixed to the upper end of the transmission shaft 29. The intermediate plate 32 is the rotary actuator.
It is designed to be horizontally driven 90 degrees forward and reverse by 23. A pair of left and right fluid pressure cylinders 33 are fixed to the lower side of the intermediate plate 32, and arms 35 are fixed outwardly above the piston rods 34 of the fluid pressure cylinders 33 that move vertically. Keys 36 are fixed to the ends of the arms 35 upward, respectively. These keys 36 are located symmetrically with respect to the central axis of the table 22, and as the arm 35 moves up and down within a predetermined range, a notch 37 formed on the outer periphery of the table 22.
And appears on the upper side of the table 22 via. Both of the cutouts 37 are arc-shaped with the central axis of the table 22 as the center, and are located symmetrically with respect to the central axis. The key 36 rotates integrally with the intermediate plate 32 and hits the lower portion of the protrusion 2 of the work 1 in the tangential direction of the rotation locus. The length of the key 36 in the direction of the rotational trajectory is longer than the interval between the protrusions 2 in the group, and
Shorter than the interval between. Thus, the key 36, the fluid pressure cylinder 33, the rotary actuator 23 and the like constitute a work rotating mechanism 38 for rotating the work 1 on the table 22 until the projection 2 reaches a predetermined position.

In FIG. 3, reference numeral 41 denotes a conveyor on which the work 1 before alignment is placed and conveyed, and the front end of the conveyor 41 in the conveyance direction is adjacent to the rear edge of the table 22. Further, a pusher 42 is provided on the rear side of the table 22 so as to be horizontally rotatable. This pusher 42
It is rotatably driven by a hydraulic cylinder (not shown) via an arm 43 and moves between a position between the center of the table 22 and the conveyor 41 shown by a solid line and a position separated from both of them as shown by a chain line. It is a thing.

In FIGS. 1 and 2, 51 is a chuck, and this chuck 51 is a 6-axis handling robot that conveys the work 1 from a positioning device to a die of a forging press.
It is provided at the tip of the arm 52 and holds the work 1 detachably. Next, the structure of the chuck 51 will be described. A chuck base 54 is fixed to the tip of the tip arm 53 of the handling robot 52, and the work 1 on the table 22 is attached to the tip of the chuck base 54.
Are integrally provided with three upper pressing portions 55 that press down from above. These upper holding portions 55 are located on the same circumference as the work 1 at three locations surrounding the center thereof, and are located on the same plane. A fluid pressure cylinder 56 is provided at the base of the chuck base 54. This fluid pressure cylinder 55 has a speed controller 57 as a gripping force adjusting means for adjusting the gripping force of the chuck 51 in two steps.
Is controlled by a control means 58 such as a computer,
The gripping force of the chuck 51 is weakened when the work 1 is rotated by the work rotating mechanism 38, and the gripping force of the chuck 51 is increased when the work 1 is conveyed. A transmission rod 62 is connected to a piston rod 59 of the fluid pressure cylinder 55 via a floating joint 61. On the other hand, the intermediate portion of the link 64 is axially attached to the bracket 63 fixed on the tip portion of the chuck base 54,
The tip of the transmission rod 62 is pivotally attached to one end of the link 64. A drive rod 65 is vertically movably supported at the tip of the chuck base 54, and the other end of the link 64 is rotatably engaged with the upper portion of the drive rod 65. Further, three sliders 67 are supported horizontally and radially slidably with respect to the central axis of the drive rod 65 on a slider base 66 fixed to the lower end of the chuck base 54. Further, the slider base 66 has the intermediate portions of three links 68 axially attached thereto. One end of each of these links 68 is rotatably engaged with the lower portion of the drive rod 65, and the other end thereof is rotatably engaged with each slider 67. And each of these sliders 67
The lateral holding portions 69 are fixed to the respective tip portions of the. These lateral holding portions 69 are respectively the upper holding portions 55.
It is located in between and holds the work 1 by coming into contact with the inner peripheral surface of the work 1 so as to be able to come in contact with and separate from the radial direction thereof. With the configuration described above, when the transmission rod 62 is pulled by the fluid pressure cylinder 56, the drive rod 65 descends via the link 64, and the three sliders 67 and the lateral holding portion 69 open via the link 68, When the transmission rod 62 is pushed by the fluid pressure cylinder 56, the drive rod 65 rises via the link 64, and the three sliders 67 and the lateral holding portion 69 close via the link 68.

Next, the operation of the above configuration will be described. In the production of the sintered forged body, the sintered work 1 is reheated by a reheating furnace (not shown), and the reheated work 1 is sent to the alignment device by the conveyor 41. The alignment of the work 1 by this alignment device is performed before the work 1 is transferred to the forging die (not shown) by the handling robot 52, and the protrusion 2 is forged by rotating the work by an appropriate angle. It is oriented so as to come to a predetermined position that fits in the groove when it is carried into the mold.

First, the work 1 conveyed by the conveyor 41 is placed on the table 22 in a state where the pusher 42 is detached from the table 22 and the conveyor 41, as shown by a chain line in FIG. Here, as shown by the solid line in the figure, the pusher 42 rotates and the work 1 is pushed to push the table.
Send it to almost the center of 22. Then, the pusher 42 returns. Further, in the handling robot 52, the entire chuck 51 descends, and its upper holding portion 55 presses against the upper end surface of the work 1. Further, the fluid pressure cylinder 56 pulls the transmission rod 62 to open the three lateral pressing portions 69, which press against the inner peripheral surface of the work 1 and hold it. In this way, the workpiece 1 is gripped by the chuck 51. At this time, the pressure of the fluid supplied to the fluid pressure cylinder 56 is small and the gripping force of the chuck 51 is weak. Then, the upper holding portion 55 is the work 1
Since the horizontal pressing portion 69 is in contact with the horizontal upper end surface of the workpiece 1 and the lateral pressing portion 69 is in contact with the inner peripheral surface of the workpiece 1 forming the cylindrical surface, the workpiece 1 can be horizontally rotated with respect to the chuck 51. Further, the work 1 is radially positioned on the table 22 by the pressing by the lateral pressing portion 69 as described above, and the central axes of the table 22 and the work 1 are aligned with each other. Since the keys 36 are recessed from the upper surface of the table 22 from the time when the work 1 is carried into the table 22 to the time when the workpiece 1 is positioned in the radial direction, the keys 36 do not interfere.

Next, the key 36 is pushed up together with the arm 35 by driving the fluid pressure cylinder 33, and further, the intermediate plate 32 is driven by driving the rotary actuator 23.
At the same time, the key 36 rotates clockwise as indicated by arrow A. At this time, as shown in FIG. 4, if a wide interval between the protrusions 2 of the work 1 is located above the key 36 from the beginning, the key 36 immediately rises and enters the rotation trajectory of the protrusion 2. On the other hand, as shown by the solid line in FIG. 5, if the protrusion 2 of the work 1 is initially located above the key 36, the work 1 is pressed from above by the upper pressing portion 55 of the chuck 51, and therefore the key 36 is pressed. Cannot rise immediately. In this case, at first, the work piece 1 does not rotate due to the proper holding of the chuck 51, and the rotating key 36 slides under the protrusion 2 to cause some rotation as shown by the chain line in FIG. Only after that, the key 36 reaches the wide space between the protrusions 2 and the key 36 moves up to enter the rotation trajectory of the protrusion 2. In any case, even after the protrusion 2 has entered the rotation locus, the chuck 51 remains until the key 36 hits the protrusion 2 of the work 1 from the tangential direction of the rotation locus.
The work 1 held by is stopped on the table 22. However, after the key 36 hits the projection 2 of the work 1, the work 1 slides with respect to the chuck 51 and rotates integrally with the key 36 on the table 22. The key 36 rotates 90 ° to a predetermined position as shown in FIG. Then, as shown in FIG. 7, the rotary actuator 23
Is reversed, and the key 36 is rotated 90 ° counterclockwise as indicated by arrow B. In this way, the work 1 is oriented in a predetermined direction with reference to the position of the key 36 that rotates to a predetermined position, and the protrusion 2 thereof comes to a predetermined position.

After this alignment is completed, the pressure of the fluid supplied to the fluid pressure cylinder 56 of the chuck 51 increases, and the gripping force of the chuck 51 on the work 1 becomes stronger.
Then, the work 1 is handled by the handling robot 52.
It is transported to the forging die of the forging press. The table
The first move of Work 1 against 22 is a rise. Then, after the work 1 reaches a predetermined position of the forging die, the transmission rod 62 is pushed by the fluid pressure cylinder 56, the lateral pressing portion 69 is closed, and the work 1 is separated from the chuck 51. At this time, since the work 1 is aligned as described above, the projections 2 are surely fitted into the corresponding grooves of the forging die. Further, after the alignment is completed, the fluid pressure cylinder 33 operates and the key 36 descends from the table 22.

As described above, according to the configuration of the above embodiment, a part of the handling robot 52, that is, the chuck 51.
Is one of the components of the alignment device, and the workpiece 1 is preliminarily gripped by the chuck 51 of the handling robot 52, the workpiece 1 is rotated and aligned,
Immediately after this alignment, the handling robot 52 can convey the work 1 and the handling robot 52 can promptly convey the work 1. That is, work 1
It is possible to shorten the time from the exit of the reheating furnace to the loading into the forging die, and therefore the temperature drop of the work 1 during that time can be reduced.

The chuck 51 presses the inner peripheral surface of the work 1 by the lateral pressing portion 69 in order to hold the work 1 and pushes up the key 36 when the key 36 is initially located under the protrusion 2. In order to prevent the work 1 from being lifted up against this, the work 1 must be pressed from above by the upper presser 55, but the horizontal presser 69 is assumed to move independently of the upper presser 55, and the upper presser 55 Basically moves up and down with respect to the work 1, so that the pressing portions 55 and 69 basically do not slip with respect to the work 1.
Therefore, unlike the case where the work 1 is not damaged and the upper holding part moves in the radial direction of the work 1 together with the lateral holding part, the work 1 moves in the radial direction together with the specific upper holding part 55. This prevents the lateral pressing portion 69 from reliably positioning the work 1 in the radial direction.

Further, the heights of the individual works 1 may vary due to variations in powder molding, and the table 22 and the work rotation can be changed depending on such variations in the heights of the works 1. The lift plate 14 that supports the mechanism 38 and is urged upward by the fluid pressure cylinder 15 moves up and down. As a result, variations such as the height of the work 1 pressed from above by the upper pressing portion 55 of the chuck 52 are absorbed, and the force for pressing the work 1 in the vertical direction becomes relatively constant for each work 1. Therefore, for example, it is possible to prevent the work 1 from being damaged or the positioning operation being hindered due to the key 36 rubbing in an excessively pressurized state.

Further, when the work 1 is aligned, the key 36 is rotated twice forward and backward with respect to one work 1. Therefore, the alignment by the key 36 can be ensured. Here, the reason will be described. In the alignment with the key 36 as described above, from the distribution of the protrusions 2 on the work 1 and the size and rotation amount of the key 36, if the work 1 is surely rotated only when it should be rotated, the key 36 By only rotating in the direction indicated by arrow A,
You should be able to align. However, if the work 1 rotates a little with the key 36 that is pressed against the lower side of the protrusion 2 due to a catch, for example, the key 36
During the rotation in the direction indicated by the arrow A, the key 36 cannot be put in the rotation locus of the projection 2, or even if the key 36 enters the scale, the key 36 is pushed to the projection 2 from the tangential direction of the rotation locus to the end. There may be no. On the other hand, by rotating the key 36 twice normally and reversely, for example, even if the first rotation in the direction indicated by the arrow A does not eliminate the catch, the rotation in the next direction indicated by the arrow B causes the catch. Will be eliminated, and the alignment will be ensured. Moreover, as can be inferred from FIG. 5, at the end of the first rotation, even if the key 36 does not hit the protrusion 2 in the tangential direction of the rotation locus, the key 36 side in the cutout 37 is This key
There is a high probability that a wide space between the protrusions 2 in which the 36 should enter is located. Therefore, at the next reverse rotation, the probability that the key 36 enters the wide gap between the protrusions 2 becomes extremely high. Thus, by rotating the key 36 twice forward and backward with respect to one work 1, the probability of misalignment is greatly reduced.

Moreover, in any case, a key is provided for each work 1.
Since it is necessary to return the 36 to the initial position, even if the key 36 is rotated 90 ° each twice forward / reverse with respect to one workpiece 1, the number of steps does not increase, and it is necessary for alignment. The time does not increase.

Further, the chuck 51 is capable of adjusting its gripping force in two steps and grips the work 1 weakly when the work 1 is rotated for alignment.
It is possible to rotate the work 1 while smoothly sliding on the work piece 51, and thus to prevent the work 1 from being damaged by rubbing. On the other hand, since the work 1 is strongly gripped when the work 1 is subsequently conveyed, the work 1 floating in the air
Can be prevented from falling off the chuck 51, or the alignment state can be prevented from being disturbed during conveyance.

The present invention is not limited to the above embodiment, but various modifications can be made. For example,
INDUSTRIAL APPLICABILITY The present invention can be applied not only to the outer race 1 which is a transmission part of an automobile, but also to general annular articles having protrusions on only the outer circumference or the inner circumference. Also,
In the above embodiment, the protrusions are provided on four sides, but
The direction of rotation of the key may be 180 °, 120 °, 72 ° or the like in this case.

[0030]

According to the first aspect of the present invention, in a positioning device for rotating and orienting an annular work having a projection protruding in the radial direction, the table and the work placed on the table are made rotatable. It is equipped with a transfer chuck for gripping, and a work rotating mechanism for rotating the work gripped by the chuck until the protrusion reaches a predetermined position on the table.The chuck holds the work from above and holds the work. It has a horizontal holding part that is held in the radial direction, but since this side holding part moves independently of the upper holding part, basically each holding part does not slip on the work, and this work Is not damaged and the work piece moves in the radial direction together with the specific top holding part, unlike the case where the top holding part moves in the radial direction together with the side holding part. It is not, so that the horizontal pressing portion positioned in the radial direction of the workpiece by is performed reliably.

According to the invention of claim 2, in the aligning device for rotating and orienting the annular work having the projection protruding in the radial direction, the table and the work placed on the table are rotatably held. The table and the work rotating mechanism were supported by a chuck for transportation having an upper holding portion and a side holding portion, and a work rotating mechanism that rotates the work held by the chuck until the protrusion reaches a predetermined position on the table. The lift table is supported on the base so that it can move up and down, and the lift table is urged upward with respect to this base, so even if there are variations in work height, this variation can be absorbed. The force for pressing the work in the vertical direction becomes relatively constant, and it is possible to prevent the work from being damaged or the positioning operation from being disturbed.

According to the invention of claim 3, in a positioning device for rotating and orienting an annular work having a projection protruding in a radial direction, a table and a work placed on the table are rotatably held. It is equipped with a transfer chuck and a work rotation mechanism that rotates the work gripped by this chuck until the protrusion reaches a predetermined position on the table.The work rotation mechanism appears on the table and rotates on the table. Then, there is a key that hits the protrusion of the work from the tangential direction of the rotation trajectory.
Since one work is rotated twice forward and backward, it is possible to ensure the alignment with the keys.

According to the invention of claim 4, in a positioning device for rotating and orienting an annular work having a projection protruding in a radial direction, a table and a work placed on the table are rotatably held. It is equipped with a transfer chuck and a work rotation mechanism that rotates the work gripped by the chuck until the protrusion reaches a predetermined position on the table.The chuck weakens the work when rotating the work for alignment. Since the work is strongly gripped during gripping and subsequent transportation, this rotation is performed smoothly when the work is rotated for alignment and damage to the work can be prevented, while the work is detached from the chuck during transport. And it is possible to prevent the alignment state from being disturbed on the way.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of a positioning device of the present invention.

FIG. 2 is a plan view of the same chuck.

FIG. 3 is a plan view of the above conveyor and table.

FIG. 4 is a plan view showing an operation of alignment, which is an example of an initial state.

FIG. 5 is a plan view showing the operation of the same as above, showing another example of the initial state.

FIG. 6 is a plan view showing the action of the same as above, showing a state at the end of rotation of the key in the positive direction.

FIG. 7 is a plan view showing the action of the same as above, showing the state at the end of rotation of the key in the opposite direction.

FIG. 8 is a perspective view of a work.

[Explanation of symbols]

 1 Work (Outer Race) 2 Protrusion 11 Base Plate (Base) 14 Elevating Plate (Elevating Table) 15 Fluid Pressure Cylinder (Biasing Mechanism) 22 Table 36 Key 38 Work Rotation Mechanism 51 Chuck 55 Upper Pressing Section 57 Speed Controller (Gripping Force Adjustment) Means) 58 Control means 69 Side holding part

Claims (4)

[Claims] 1. A positioning device for rotating an annular work having a projection protruding in a radial direction to orient the work so that the projection comes to a predetermined position, and a horizontal table on which the work is placed. A chuck for conveyance for rotatably gripping the work, and a work rotating mechanism for rotating the work gripped by the chuck until the protrusion reaches a predetermined position on the table, and the chuck is provided on the table. An aligning device comprising: an upper pressing portion that presses a work from above; and a lateral pressing portion that moves in the radial direction of the work independently of the upper pressing portion and holds the work in the radial direction. 2. A position adjusting device for rotating an annular work having a projection projecting in a radial direction to orient the work so that the projection comes to a predetermined position, and a horizontal table on which the work is placed. A chuck for conveyance for rotatably gripping the work, and a work rotating mechanism for rotating the work gripped by the chuck until the protrusion reaches a predetermined position on the table, and the chuck is provided on the table. An upper holding part for holding the work from above and a horizontal holding part for moving in the radial direction of the work and holding the work from the inner peripheral side, and an elevating table supporting the table and the work rotating mechanism are mounted on the base. An aligning device, which is supported so as to be movable up and down, and urges the lifting table upward with respect to the base by a biasing mechanism. 3. A positioning device for rotating an annular work having a projection projecting in a radial direction to orient the work so that the projection comes to a predetermined position, and a horizontal table on which the work is placed. A work chuck that rotatably grips the work, and a work rotation mechanism that rotates the work gripped by the chuck until a protrusion comes to a predetermined position on the table. It has a key that is driven to move up and down on the table and rotates on this table to hit the protrusion of the work from the tangential direction of the rotation trajectory. Rotate this key twice forward and backward with respect to one work. A positioning device characterized by: 4. A position adjusting device for rotating an annular work having a projection protruding in a radial direction to orient the work so that the projection comes to a predetermined position, and a horizontal table on which the work is placed. A chuck for conveyance for rotatably gripping the work, and a work rotating mechanism for rotating the work gripped by the chuck until the protrusion reaches a predetermined position on the table, the chuck gripping the chuck. A gripping force adjusting means for adjusting the force, and a control means for weakening the gripping force of the chuck when rotating the work by the work rotating mechanism and increasing the gripping force of the chuck when the work is conveyed by the chuck. Characterizing alignment device.