JPS6246298B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Application of the Invention] The present invention rotates the rotary table by a drive device that engages with the outer circumferential side of the rotary table, and also controls the engagement between the drive device and the rotary table when inserting a positioning pin. The present invention relates to a rotary indexing device that performs positioning by releasing the alignment.

[Prior Art] Various types of rotary index devices have been used to position rotary tables. FIG. 1 shows a general index unit, which is composed of a rotary index unit 1 driven by a motor 2, etc., and a rotary table 13 connected thereto by bearing support.
The accuracy of the index is determined by the accuracy of the stop position of the rotary index unit 1, and the number of indexes is limited to approximately 4, 8, 12, 16, etc. due to the shape limitations of the rotary index unit 1. Furthermore, as the number of indexes increases, the outer diameter of the rotary table 13 also increases, which requires rigidity, which increases the size of the entire device, and has the disadvantage that the device becomes complicated and expensive in order to maintain index accuracy. .

That is, as shown in FIG. 1, a rotary shaft 10 is connected upright to an output shaft 9 on the upper side of the rotary index unit 1 placed on a pedestal, and a rotary table 13 is connected to the upper side of the output shaft 9. installed. Incidentally, the rotating shaft 10 is pivotally mounted by a bearing 11 to a bracket 12 attached to the above-mentioned frame. A reduction gear 7 and a clutch brake unit 5 are connected to an input shaft 8 of the rotary index unit 1 via a shaft joint 6, and these are connected to a drive motor 2 via a timing pulley 3 and a timing belt 4. From the above configuration,
The rotary table 13 is indexed by rotating the rotary index unit 1 by the drive motor 2, and the index accuracy is determined by the stop position accuracy of the rotary index unit 1. Further, the number of indexes is limited to approximately 4, 8, 12, or 16 due to the structure of the rotary index unit 1, and it is not possible to set an arbitrary number of indexes. Furthermore, as the number of indexes increases, the shape of the rotary index unit 1 becomes larger, and the outer diameter of the rotary table 13 increases in proportion. rotary table 1
When the outer diameter of rotary table 3 increases, the dimensions of each part become larger and heavier due to the rigidity, and the drive system for driving rotary table 13 becomes larger and has a larger capacity.

As described above, in conventional rotary indexing devices, the number of indexes cannot be set arbitrarily, the device becomes larger and more expensive as the number of indexes becomes larger, and the accuracy of the indexing has a large effect on the stopping position accuracy of the rotary indexing unit. There were drawbacks such as dependence and limitations. One way to solve this problem is to attach a stop positioning pin unit (not shown) to the rotary table 13, but this method has the disadvantage of complicating the device. Furthermore, as shown in Japanese Patent Application Laid-Open No. 55-56688, a method is adopted in which the outer circumference of the rotary table is supported while applying rotational force, the rotary table is stopped by pressing it against a predetermined stopper, and the positioning pin is inserted into the rotary table for positioning. However, with this method, the number of indexes is limited to 2 or 4, and positioning is performed by repeatedly rotating the rotary table forward and backward, and it is technically difficult to perform indexing sequentially while rotating in one direction. However, the structure is complicated and expensive.

[Purpose of the invention]

The present invention was devised to solve the above-mentioned drawbacks, and its purpose is to make the device small, lightweight, simple, and inexpensive, and also to be able to set an arbitrary number of indexes, and to be able to perform positioning. An object of the present invention is to provide a rotary indexing device that can improve accuracy.

[Summary of the invention]

In order to achieve the above objects, the present invention provides a table horizontal holding device that engages with the outer circumferential side of a rotary table having a fixed rotating shaft and holds it horizontally; a drive device having a friction wheel and a drive motor for driving the same, a pressing means for pushing the drive device toward a rotary table, a positioning pin portion that engages in a positioning hole of the rotary table so as to be freely removable and removable, and the positioning pin. A separating means is provided which separates the driving device from the rotary table by the insertion operation of the rotary table against the pressing means, and the rotating shaft of the relatively lightweight rotary table holds the center of the driving device, and the outer peripheral portion of the rotary table holds the driving device at the center. While holding the pin horizontally using a horizontal holding device that prevents it from vertically wobbling, a driving device applies rotational force to the outer circumference of the pin, and when inserting the locating pin, the driving device is separated from the rotary table and the locating pin It features a rotary index device that is inserted into a positioning hole in the table to enable accurate positioning.

[Embodiments of the invention]

Embodiments of the present invention will be described below based on the drawings.

First, an outline of the embodiment will be explained with reference to FIGS. 2 and 3.

The rotary table 15 is horizontally supported by a bearing 22. rotary table 15
A large number of positioning holes 16 are formed through the outer circumferential side. Note that the rotary table 15 is formed thin to reduce weight. The table horizontal holding device 60 holds the thin rotary table 15 horizontally, and is provided on the outer peripheral side of the rotary table 15, and is arranged at three locations on the circumference as shown in FIG. Further, a friction wheel 19 of a drive device 61 is engaged with the outer peripheral side of the rotary table 15. A pressing means 62 made of a spring 24 or the like is engaged with the driving device 19 to press the friction wheel 19 of the driving device 19 against the rotary table 15. Directly below the positioning hole 16 of the rotary table 15 is a positioning pin portion 6 having a positioning pin 25 that is inserted into and inserted into the positioning hole 16 freely.
3 is provided. Between the drive device 61 and the positioning pin portion 63, the drive device 61 is inserted into the rotary table 1 as the positioning pin portion 63 is inserted.
A spacing means 64 is provided for spacing it from 5. This separating means 64, which will be explained in detail later, is formed by closely engaging an inclined block 30 provided on the driving device 61 side and an inclined block 29 provided on the positioning pin portion 63.

The rotary table 15 of the rotary indexing device having the above configuration is rotated by the drive device 61, and immediately before the positioning pin 16 of the positioning pin portion 63 is inserted into the positioning hole 16,
4, the drive device 61 is connected to the rotary table 15.
The rotation of the rotary table 15 is stopped. At the same time, insert the positioning pin 25 into the positioning hole 16.
The rotary table 15 is then positioned.

Next, this example will be explained in more detail.

As shown in FIG. 2, a bracket 45 is attached to the pedestal table 18 on the upper surface side of the pedestal 47.
A bearing support bracket 20 is provided within the bracket 45.

A rotating shaft 46 provided at the center of the thin disk-shaped rotary table 15 is pivotally supported by a bearing 22 inserted into a bearing support bracket 20. Reference numeral 21 indicates a bearing spacer. Further, as shown in FIG. 3, near the outer circumferential side of the rotary table 15, a plurality of positioning holes 16 are formed through the circumference by dividing the circumference into a plurality of equal parts at equal intervals. Further, on the outer circumferential side of the rotary table 15, one drive device 61 engages with a horizontal holding device 60 provided at positions dividing the circumference into three equal parts.

As shown in FIG. 2, the table horizontal holding device 60
The table holding pulley 17 is formed in the shape of a V pulley having a V groove, and is in close contact with an acute corner of the inverted V shape formed on the outer periphery of the rotary table 15. Further, the table holding pulley 17 is pivoted on a shaft that stands upright on a block 48 that is supported on the pedestal table 18 so as to be slidable in the horizontal direction, and prevents the outer peripheral side of the rotary table 15 from drooping and holds it horizontally. Positioning in the height direction is performed so that the Mata block 4
8 is horizontally moved by a push bolt 49 to adjust the gap between the table holding pulley 17 and the rotary table 15. In addition, the table horizontal holding device 60 is
As mentioned above, they are provided at three equal intervals on the circumference.

Next, the drive device 61 is shown in FIGS. 2, 4 to 7.
This will be explained using figures. The drive device 61 includes the friction wheel 1
9, a motor bracket 31, a drive motor 23, etc.

The friction wheel 19 is made of a material such as rubber to increase frictional resistance, is formed in the shape of a V-pulley with a V-groove, and is disposed at a position where it is closely joined to the acute corner of the inverted V shape on the outer periphery of the rotary table 15. be done. As shown in FIG. 5, the rotating shaft 33 of the friction wheel 19 is connected to the drive motor 23 via a coupling 34, and is connected to the drive motor 23 by a bearing 32 inserted in a motor bracket 31 connected to the flange of the drive motor 23. It is pivotally supported. On the other hand, trestle table 1
8, as shown in FIGS. 5 and 7, supporting metal fittings 36, 36 are fixedly provided facing each other, and guide blocks 37 are provided facing each other on the supporting metal fittings 36, 36, respectively. There is. Guide block 37
A groove parallel to the surface of the gantry table 18 is formed in the groove, and protrusions 35 provided on the outer side of the motor bracket 31 and facing each other are slidably engaged with the groove. Thereby, the drive device 61 is supported so as to be movable in the radial direction of the rotary table 15.

With the above configuration, the friction wheel 19 is connected to the drive motor 2.
3, rotational force can be transmitted to the rotary table 15, and the entire drive device 61 can be horizontally moved in the radial direction of the rotary table 15. Note that a plate 43 is provided over one end surface of the support fitting 36.

Next, the pressing means 62 will be explained with reference to FIGS. 2, 4, 6, and 7.

A hold pin 39' is formed to protrude from the outer side of the motor bracket 31, which is perpendicular to the outer side where the protruding portion 35 of the drive device 61 is formed. A hold pin 39 attached to the L-shaped fitting 38 is provided at a position facing and away from this hold pin 39'. Further, the L-shaped metal fitting 38 is fixedly installed on the mount table 18. Hold pin 39
A spring 24 is provided between the holding pin 39' and the holding pin 39', and is biased to press the drive device 61 toward the rotary table 15.

Next, the positioning pin portion 63 will be explained with reference to FIGS. 2, 4, 6, and 7.

The positioning pin portion 63 is composed of the positioning pin 25, the pin block 40, the air cylinder 28, and the like. The positioning pin 25 has an outer diameter that is fit into the positioning hole 16 of the rotary table 15, is provided upright below the positioning hole 16 of the rotary table 15, and is attached to the upper side of the pin block 40. An air cylinder 28 is connected to the lower side of the pin block 40 via a joint 26. Air cylinder 28 is attached to support plate 27 attached to plate 43. A protrusion 5 is provided on the opposing outer surface of the pin block 40.
0, and the protrusion 50 is slidably supported in a groove of a guide block 51 attached to the support fitting 36. Note that the groove portion is located at the positioning pin 25.
The insertion direction is formed.

With the above configuration, the positioning pin part 63 moves the positioning pin 25 up and down while being guided by the guide block 51 by the air cylinder 28,
This is moved in and out of the positioning hole 16.

Next, the separating means 64 will be explained with reference to FIGS. 4, 6, and 7.

On the outer surface side of the motor bracket 31 opposite to the outer surface on which the hold pin 39' is provided, there is a tilt block 30 that forms an inclined angle that narrows toward the insertion direction of the positioning pin 25 of the positioning pin portion 63. It is provided. On the other hand, on the outer surface side of the positioning pin portion 63 that is perpendicular to the outer surface on which the protruding portion 50 of the pin block 40 is formed, the inclined block 29 is attached by a bolt 42 at a position facing the inclined block 30. The inclined block 29 is formed with an angle of inclination equal to the angle of inclination of the inclined block 30, so that the two can come into close contact with each other. Incidentally, the tilting block 29 can be moved in the vertical direction by means of an adjusting screw 41. The gap between the tilting blocks 30 and 29 is adjusted so that it becomes zero just before the positioning pin 25 is about to be inserted into the positioning hole 16 of the rotary table 15. Therefore, the positioning pin 25
When the is in position on the lower side, no gap is formed. Conversely, the positioning pin 25 is connected to the positioning hole 1.
6, the tilting block 30 is pushed by the tilting block 29, and the drive device 61 pushes the pushing means 63.
resists the spring 24 and moves toward the pressing means 63 side.
Therefore, the friction wheel 19 is separated from the rotary table 15, and the rotation of the rotary table 15 is stopped.

Next, the operation of this embodiment will be explained.

As shown in FIG. 4, a drive device 61 is engaged with the rotary table 15, and a friction wheel 19 applies rotational force to the rotary table 15. The rotary table 15 rotates smoothly due to the pressing force of the pressing means 62 and the frictional force of the friction wheel 19. Since the rotary table 15 has a large radius and is formed to be thin and lightweight, it can be rotated with a small rotational force. Therefore, the drive torque of the drive motor 23 is small, and the small capacity drive motor 2
3 is sufficient. Further, although the rotary table 15 is thin, as described above, it is held horizontally by the table horizontal holding device 60, so that it can rotate smoothly without drooping on the outer circumferential side. In the above state, the positioning pin portion 63 is positioned at the lowest position by operating the air cylinder 28. Therefore, as mentioned above, the inclined block 3 of the separating means 64
A gap is formed between 0 and the inclined block 29. Of course, due to the spring 24 of the pressing means 62, the driving device 61
is pushed toward the positioning pin portion 63, but as described above, since the rotary table 15 and the friction wheel 19 are pressed against each other, a gap remains between the tilting block 30 and the tilting block 29. .

Next, the air cylinder 28 is operated at an appropriate time by timer control or a photoelectric switch (not shown), and the positioning pin 25 is raised. However, as described above, the gap does not become zero until the positioning pin 25 comes directly in front of the positioning hole 16, and the drive device 61 continues to drive the rotary table 15. At the same time as the positioning pin 25 is inserted into the positioning hole 16, the inclined block 2 is inserted as described above.
9, the tilting block 30 is pushed and the friction wheel 19 of the drive device 61 is separated from the rotary table 15. Therefore, the rotary table 15 stops. At the same time, the positioning pin 25 is inserted into the positioning hole 16, and positioning is completed. Next, by lowering the air cylinder 28 again, the positioning pin 2
5 comes out of the positioning hole 16, the pressing means 62
Due to the action of the spring 24, the drive device 61 engages with the rotary table 15, and the rotary table 15 begins to rotate smoothly due to the constantly rotating drive motor 23.

As described above, the positioning pins 2 are sequentially inserted into the positioning holes 16 accurately formed in the rotary table 15.
By fitting and inserting the positioning hole 16, positioning accuracy can be maintained and the positioning hole 16
By forming an appropriate number of indexes, it is possible to set an arbitrary number of indexes. Further, as mentioned above, since the rotary table is thin and lightweight, its support structure can be made smaller, and as mentioned above, since the drive rotational force is small, the drive system can also be made smaller and smaller in capacity. Further, unlike the prior art, there is no need for a rotary index unit, a speed reducer, etc., the number of component parts is reduced, and the device is lightweight and inexpensive.
Further, as for the control means, only the air cylinder 28 etc. need to be controlled, making it extremely simple. Furthermore,
As shown in FIG. 2, since each device is disposed in the space between the rotary table 15 and the pedestal 47, the surplus space can be used effectively and space can be saved.

In the above embodiment, the friction wheel 19 of the drive device 61 is engaged with the outer periphery of the rotary table 15, but it may be engaged with a surface near the outer periphery. Of course, in this case, the structure and direction of the pressing means 62 and the separating means 64 are different from the present embodiment.

In addition, the friction wheel 19 and the table holding pulley 17
is not limited to a V-pulley type. Further, the table horizontal holding device 60 is not limited to three locations on the circumference, and the driving device 61 is not limited to one location.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, it is possible to reduce the size of the device, reduce the capacity, and simplify the device.
In addition to being lightweight and inexpensive, it is possible to set an arbitrary number of indexes, and the positioning accuracy can be improved.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view showing a conventional rotary indexing device, FIG. 2 is a front sectional view of an embodiment of the present invention, FIG. 3 is a plan view showing the area around the rotary table, and FIG. Front sectional view showing the state of the main part of the embodiment before the positioning pin is inserted, No. 5
The figure is a side sectional view showing the drive device of the embodiment, FIG. 6 is a front sectional view showing the state of the main part of the embodiment when the positioning pin is inserted, and FIG. 7 is a plan view of the indicator in FIG. 6. . 15... Rotary table, 16... Positioning hole, 17... Table holding pulley, 18... Frame table, 19... Friction wheel, 20... Bearing support bracket, 21... Bearing spacer,
22... Bearing, 23... Drive motor, 24
... Spring, 25 ... Locating pin, 26 ... Joint, 27 ... Support plate, 28 ... Air cylinder, 29 ... Tilting block, 30 ... Tilting block, 31 ... Motor bracket, 32 ... Bearing, 33...rotating shaft, 34...coupling,
35...Protrusion, 36...Support fitting, 37...Guide block, 38...L-shaped fitting, 39...Hold pin, 39'...Hold pin, 40...Pin block, 41...Adjustment screw, 42 ...Bolt, 43...Plate, 45...Bracket, 4
6... Rotating shaft, 47... Frame, 48... Block, 49... Push bolt, 50... Projection, 51
... Guide block, 60 ... Table horizontal holding device, 61 ... Drive device, 62 ... Pressing means, 6
3...Positioning pin portion, 64...Separation means.

Claims (1)

[Claims] 1. Engages with the outer circumferential side of a rotary table that has a rotating shaft fixed in the center and has a positioning hole formed near the outer circumference, and engages with the outer circumferential side of the rotary table in the same way as the table horizontal holding device that holds it horizontally. A drive device having a friction wheel and a drive motor for driving the friction wheel, a pressing means for pressing the drive device toward the rotary table, and a positioning pin portion that engages in the positioning hole so as to be freely removable and removable.
an inclined block provided on the drive device side and forming an inclined angle narrowing toward the inserting direction of the positioning pin part; and an inclined block provided on the positioning pin part side forming an inclined angle that closely approaches the inclined block; and a tilting block movable in the insertion direction of the positioning pin portion, and separating means for separating the drive device from the rotary table against the pressing means. Tux device.