JP3804718B2 - Indexing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an indexing device in which a rotary actuator is used as a rotational drive unit and a cylinder is used as a drive transmission unit, and an indexing table is rotated at a constant angle.
[0002]
[Prior art]
A pneumatic indexing device is already known as disclosed in, for example, Japanese Patent Laid-Open No. 5-1704. As shown in FIG. 6, this known indexing device rotates an indexing table 63 on which a tool, a workpiece or the like is to be mounted at a predetermined pitch in the circumferential direction, and serves as a driving source for rotating the index at a predetermined angle. A rotary actuator 61 that rotates forward and backward in a range is used, and a cylindrical index shaft 64 integrated with the indexing table 63 is connected to and separated from an output shaft 62 of the rotary actuator 61 by a joint member 65. .
[0003]
More specifically, in this index device, the index shaft 64 rotatably supported by bearings 67 and 67 in the casing 66 is slidable in the axial direction in which a piston 68 is fitted. A joint member 65 is provided, a forward pressure chamber 69 is provided at the lower end of the joint member 65, and a backward pressure chamber 70 is provided above the joint member 65 and the piston 68, and the pressure chambers 69, 70 are driven. Pressure fluid (compressed air) can be supplied and discharged, and the joint member 65 can be selectively held in the upward movement position and the downward movement position.
[0004]
The joint member 65 is engaged with the concave portion 72 provided at the lower end of the index shaft 64 by rotatingly engaging the convex portion 71 provided on the outer periphery of the lower end portion at the upward movement (forward movement) position shown in the right half of FIG. The claw portion 73 also serving as a piston receiver protruding from the inner periphery of the joint member 65 is engaged with a radial protrusion 74 around the tip of the output shaft 62 of the rotary actuator 61 having the tip inserted into the joint member 65. Further, in the downward movement (return) position shown in the left half of FIG. 6, the projection 71 provided on the joint member 65 is disengaged from the claw 73 and the projection 74 at the tip of the output shaft 62. Is engaged with a restraining member 76 made of an annular array of protrusions provided on the end plate 75 of the casing 66.
[0005]
However, in such a configuration, the joint member 65 itself driven by the claw 73 engaging with the projection 74 of the output shaft 62 of the rotary actuator 61 is subjected to the action of the pressure fluid together with the piston 68. It is extremely difficult to make the angle of the joint member 65 adjustable from the outside. For this reason, the accuracy of the swing stop position depends on the rotary actuator 61. In many cases, however, the rotary actuator does not have an angle adjustment function. In addition, due to a decrease in the accuracy of the stop position, the portion tends to be galling when the engagement portions are engaged and disengaged as the joint member 65 moves up and down. Even if the rotary actuator 61 has an angle adjustment function, the engagement portion between the projection 74 of the output shaft 62 of the actuator and the claw portion 73 of the joint member 65 has a small turning radius, so that the adjustment is very easy. However, it is difficult to achieve sufficient accuracy.
[0006]
Furthermore, since the rotary actuator 61 is directly provided with the driving projection 74 at the tip of the output shaft 62, a general-purpose product cannot be used. Moreover, as described above, the rotary actuator has an angle adjustment function. Therefore, there is no compatibility between the rotary actuators when exchanging the rotary actuators.
Further, the rotary actuator 61 is provided with a projection 74 directly on the output shaft 62 in the joint member 65 as a means for transmitting the swing motion, and is engaged with the claw portion 73 on the inner periphery of the joint member 65. The rotation radius of the engaging portion is small, and it is difficult to sufficiently secure the strength of the protrusion 74 and the claw portion 73.
[0007]
[Problems to be solved by the invention]
The technical problem of the present invention is that, in the index device using the rotary actuator described above, in order to increase the accuracy of the rocking stop position and to obtain an accurate indexing operation, the rocking motion part driven by the rotary actuator has an angle from the outside. The purpose is to make the adjustment mechanism installable.
Another technical problem of the present invention is to obtain compatibility of a swing unit composed of a rotary actuator by providing the function on the transmission unit side without obtaining the angle adjustment function from the rotary actuator. .
Another technical problem of the present invention is to improve maintainability by dividing the index device into a plurality of units.
Another technical problem of the present invention is to increase the rotation radius of a member for setting a rocking stop position and facilitate the angle adjustment.
Still another technical problem of the present invention is that the size of the index axis of the device itself can be easily shortened, and it can be removed by changing the mounting position of the swing unit according to the place of use of the device. An object of the present invention is to provide an index device that can be easily deformed in shape and has a degree of freedom in design.
[0008]
[Means for Solving the Problems]
An indexing device according to the present invention for solving the above-described problems includes a swing unit, a transmission unit, and an indexing table unit, and the swing unit includes a rotary actuator having a stopper guide attached to an output shaft. The indexing table unit is configured by rotatably supporting a table having a plurality of engagement grooves on the back surface, and the transmission unit opens at one end in a case body connected to the rotary actuator. A cylinder member provided with a cylinder hole and having a convex portion that engages with the stopper guide at least on a surface opposite to the opening side of the rotary actuator and facing the output shaft of the rotary actuator is rotatably fitted into the case body. An adjuster is provided for the convex part to abut at the rocking end when the cylinder member rotates and rocks. It was externally with retractable adjusted, engages a piston fitted slidably in the cylinder bore, at the stroke end of the one, the engaging groove of the engaging groove and the fixed part of the table in the indexing table unit Then, the table is held at a fixed position , and the protrusion on the stroke end side is engaged with the engagement groove of the cylinder member while maintaining the engagement with the engagement groove of the table at the other stroke end. In addition, power transmission means for transmitting rotational force to the table is provided.
[0009]
In the index device, the swing unit is configured by a rotary actuator having a power transmission mechanism on an output shaft, and the transmission unit is provided with a cylinder hole in a case body that connects the rotary actuators in a juxtaposed state. On the side opposite to the opening side, a transmission member to which rotational force is transmitted from the output shaft of the rotary actuator via the power transmission mechanism, and a cylinder member provided with a convex portion located on the peripheral side of the transmission member are rotatable. It can be inserted into.
Further, as a power transmission means in the transmission unit of the index device, the piston has, at one stroke end, an engagement groove of a table in the indexing table unit and an engagement groove of a positioning guide that rotatably supports the table. A protrusion that engages the two and holds the table in a fixed position, and a protrusion that engages with the engagement groove of the table at the other stroke end of the piston holds the engagement state. A protrusion for transmitting a rotational force to the table can be provided by engaging with an engagement groove provided on the inner bottom of the cylinder hole in the cylinder member. Furthermore, the convex part which contact | abuts the said regulator can be provided in the peripheral part of a cylinder member, and angle adjustment can be made easy.
[0010]
In the index device having the above-described configuration, the piston in the transmission unit is held at one stroke end, and both the engagement groove of the table in the indexing table unit and the engagement groove of the positioning guide that rotatably supports the table are provided. In a state where the protruding portion on the piston is engaged, even if the rotary actuator in the swing unit is driven, the rotational force is not transmitted to the table, and the table is held in a stopped state. Further, the piston is held at the other stroke end, and the protruding portion engaged with the engaging groove of the table is held in the engaged state, and the protruding portion of the piston is placed on the inner bottom of the cylinder hole in the cylinder member. When the rotary actuator is driven in this state by engaging with the provided engagement groove, the rotational force is transmitted to the table, and the rocking member is rotated to the position where the convex part provided on the cylinder member contacts the adjuster of the case body. To do. Therefore, the table can be index rotated by selectively driving the rotary actuator and the piston.
[0011]
In such an index operation, an adjuster, which is an external swing angle adjustment mechanism, is installed in the swing motion part driven by the rotary actuator. Operation can be obtained, and the function of angle adjustment is not required for the rotary actuator, but the function is provided on the transmission unit side, so that the interchangeability of the swing unit composed of the rotary actuator can be obtained. Therefore, there is no need to adjust the swing angle when mounting or replacing the rotary actuator, and the mounting can be easily performed. In addition, if adjustment during the installation of the rotary actuator is not required, the degree of freedom in design related to the installation of the rotary actuator is increased, and there is no need to always install it in the axial direction of the index shaft. Accordingly, it becomes easy to change the mounting position of the rotary actuator and shorten the dimension in the axial direction.
Furthermore, since the index device is divided into the swing unit, the transmission unit, and the index table unit, the maintainability is improved.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
1 to 3 show a preferred embodiment of an indexing device according to the present invention. As clearly shown in FIG. 3, the index device of the first embodiment includes a swing unit 1, a transmission unit 2, and an indexing table unit 4. These units are shown in FIG. Composed by combining. These combinations are performed by fitting the units together in a predetermined state and connecting them with a bolt (not shown), but any other connecting means can be used.
[0013]
Here, the swing unit 1 is configured by a vane type rotary actuator driven by compressed air. That is, the swinging shaft 11 provided with the vane 12 is rotatably accommodated in the casing 10, and the swinging shaft 11 is swung within a certain angular range by the pressure air alternately introduced to both surfaces of the vane 12. Is led out to the outside by an output shaft 13 integral with the swing shaft 11. Although the vane type is shown as the rotary actuator in the drawing, not only the vane type but also any actuator that performs a swinging motion can be employed.
[0014]
As clearly shown in FIG. 2, the stopper guide 14 is integrally fixed to the output shaft 13 of the rotary actuator by fastening the shaft mounting divided portion with a bolt 15. The stopper guide 14 is provided with a concave portion 16 for fitting a convex portion 26 provided on a cylinder member 21 of the transmission unit 2 described below at the tip thereof.
[0015]
The transmission unit 2 includes a connecting portion 20a that is fitted to the case body 20 so as to be connected to the casing 10 of the rotary actuator, and the cylinder member 21 is provided inside the case body 20 with a bearing 22. , 23 are rotatably fitted. The cylinder member 21 has a cylinder hole 24 that opens upward in the inside thereof, and functions as a cylinder tube into which the piston 25 is slidably fitted. As can be seen from FIGS. A convex portion 26 that fits into the concave portion 16 of the stopper guide 14 and a convex portion 27 that functions as a stopper are provided in the portion. Thereby, the number of parts in the transmission unit 2 can be reduced, the size can be shortened and the size can be reduced, and the rigidity can be increased. On the other hand, in the case body 20, a pair of adjusters (adjustment bolts) 28 and 29 with which the convex portions 26 and 27 come into contact with each other when the cylinder member 21 is rotated and swung can be adjusted forward and backward from the outside. It protrudes in the rotation range of 26,27.
[0016]
The convex portion 26 has a function of transmitting the swinging motion transmitted from the output shaft 13 of the rotary actuator via the stopper guide 14 to the cylinder member 21 and one of the swinging of the cylinder member 21 in contact with the adjuster 28. The convex portion 27 has only a function as a stopper that abuts the adjuster 29 and gives the other limit of the swing of the cylinder member 21. That is, the convex portion 27 and the adjuster 29 with which the convex portion 27 abuts are provided for setting the rotation angle of the rotary actuator. If it is not necessary to install the convex portion 27, for example, when it is brought into contact with 29, it is not necessary to provide it.
[0017]
As described above, the swing stop positions of the cylinder member 21 are all determined by the contact positions of the convex portions 26 and the convex portions 27 provided as necessary with the adjusters 28 and 29, and have an angle adjusting function. Since the non-rotary actuator only bears the generation of power for swinging, it is possible to maintain compatibility between the rotary actuators and to keep the swing stop position constant.
On the other hand, the adjusters 28 and 29 finely adjust the swing angle of the cylinder member 21 determined by the installation positions of the convex portions 26 and 27 and the adjusters 28 and 29 to give an accurate index operation to the swing motion. It is.
[0018]
Further, the transmission of the swing by the convex portions 26 and the stop of the swing due to the contact of the convex portions 26 and 27 with the adjusters 28 and 29 are the above-described large rotation radius provided in the peripheral portion of the cylinder member 21. Since this is performed through the convex portions 26 and 27, the claw portion 73 on the inner periphery of the joint member 65 is engaged with the projection 74 at the distal end of the output shaft of the rotary actuator 61 with a small turning radius as in the conventional example (FIG. 6). Compared with the case of combining, it is possible to increase mechanical strength and facilitate angle adjustment with high accuracy.
[0019]
On the other hand, the indexing table unit 4 has a frame-shaped positioning guide 41 attached to the case body 20 of the transmission unit 2 and a table 42 provided with a plurality of engaging grooves 43 on the back surface, which can be rotated via a bearing 44. The positioning guide 41 is also provided with an engagement groove 45 corresponding to the engagement groove 43 of the table 42.
The piston 25 slidably fitted in the cylinder hole 24 includes a seal member 30 that is in airtight contact with the inner surface of the cylinder hole 24, and an upward motion pressure chamber 31 is provided on each of the lower side and the upper side of the seal member 30. The cylinder member 21 is provided with compressed air supply and discharge passages 33 and 34 communicating with the pressure chambers 31 and 32. These supply / discharge passages 33 and 34 are connected to a pressure source through a controller that drives the index device together with a pressure fluid supply / discharge passage of the rotary actuator.
[0020]
The piston 25 serves as a power transmission means for the indexing table unit 4. At one stroke end where the piston 25 has moved up, an engagement groove 43 on the back surface of the table 42 in the indexing table unit 4 and a positioning guide 41 are provided. A projection 35 is provided that engages with both of the engagement grooves 45 provided on the table 42 to position and hold the table 42 at a predetermined fixed position. The engaging groove 45 can be provided not only in the positioning guide 41 but also in a fixed portion of the case body 20 or the like.
[0021]
The piston 25 also moves to the other stroke end where the piston 25 is moved downward, but the engagement groove 43 provided on the back surface of the table 42 is a protruding portion of the piston 25 even in the downward movement state. 35, and the piston 25 is engaged with an engagement groove 36 provided in the inner bottom of the cylinder hole 24 in the cylinder member 21 to transmit the rotational force. A protruding portion 37 is provided. Therefore, when the piston 25 moves downward, the protrusion 35 engaged with the engagement groove 43 of the table 42 maintains the engagement state, and the protrusion 37 at the lower end of the piston 25 is engaged in the cylinder hole 24. The rotational force is transmitted to the table 42 by engaging with the joint groove 36.
In the configuration as described above, assuming that the number of projections and depressions of each engagement groove and protrusion uniformly arranged on the circumference is n and the swing angle of the rotary actuator is 360 ° / n, the table is divided into n parts. It becomes possible to rotate forward or reverse.
[0022]
In the index device having the above-described configuration, the piston 25 in the transmission unit 2 is held at one stroke end, and both the engagement groove 43 of the table 42 and the engagement groove 45 of the positioning guide 41 in the indexing table unit 4 are provided. In a state where the protruding portion 35 on the piston 25 is engaged, even if the rotary actuator in the swing unit 1 is driven, the rotational force is not transmitted to the table 42 and the table is held in a stopped state. Further, the piston 25 is held at the other stroke end, and the protruding portion 35 engaged with the engaging groove 43 of the table 42 is held in the engaged state, and the protruding portion 37 of the piston 25 is held in the cylinder hole 24. When the rotary actuator is driven in this state by engaging with the engagement groove 36 provided on the inner bottom of the cylinder, rotational force is transmitted to the table 42, and the convex portions 26 and 27 provided on the cylinder member 21 are connected to the case body 20. Oscillates to a position where it abuts against the adjusters 28 and 29. Therefore, the table 42 can be index-rotated by selectively driving the rotary actuator and the piston.
[0023]
In such an indexing operation, adjusters 28 and 29 which are swing angle adjusting mechanisms from the outside are installed in the swing motion portion driven by the rotary actuator, so that the accuracy of the swing stop position is improved. Therefore, it is possible to obtain an accurate indexing operation, and this function is provided on the transmission unit 2 side without requiring the rotary actuator to have this angle adjustment function, so that the oscillating unit 1 constituted by the rotary actuator is compatible. Sex can be obtained.
Further, the index device is configured by dividing the indexing unit 1 into the swing unit 1, the transmission unit 2, and the indexing table unit 4 and combining them together. Since the adjustment can be easily performed, it is extremely advantageous in improving maintainability.
[0024]
4 and 5 show a second embodiment of the present invention. As described above, in the present invention, the function of adjusting the angle in the indexing device is not required for the rotary actuator, and the function is provided on the transmission unit side. There is no need, and the compatibility of the rotary actuator can be obtained and the mounting thereof can be performed easily. In addition, if adjustment during the installation of the rotary actuator is not required, the degree of freedom in design related to the installation of the rotary actuator is increased, and there is no need to always install it in the axial direction of the index shaft. Accordingly, it is possible to change the mounting position of the rotary actuator.
[0025]
From this point of view, the second embodiment is constructed by changing the mounting position of the rotary actuator constituting the swing unit and shortening the dimension in the axial direction of the index device as compared with the first embodiment. Since other configurations and operations are substantially the same as those in the first embodiment, the same or corresponding parts in FIGS. 4 and 5 are denoted by the same reference numerals as those in the first embodiment. In the following, differences from the first embodiment will be mainly described.
[0026]
The transmission unit 2 in the second embodiment is such that the body of the rotary actuator constituting the swing unit 1 is fixed to one outer surface of the case body 20 with a bolt or the like, thereby connecting the actuators in a juxtaposed state. It is. The cylinder member 21 that is rotatably fitted in the case body 20 of the transmission unit 2 is provided with a cylinder hole 24 that opens at one end, and a gear from the output shaft 13 of the rotary actuator on the side opposite to the opening side. A shaft-shaped transmission member 50 to which a rotational force is transmitted via 51 and 52 is provided. Further, a convex portion 26 is provided on the peripheral side of the transmission member 50 and on the peripheral portion of the cylinder member 21 as much as possible, and comes into contact with the adjusters 28 and 29 at the swing end when the cylinder member 21 rotates and swings. ing. As in the case of FIG. 2, the convex portion 26 can be a plurality (26, 27) that abuts on the adjusters 28, 29.
Here, the case where the gears 51 and 52 are used to transmit the rotational power from the rotary actuator to the transmission member 50 in the cylinder member 21 is shown, but instead, chain drive or timing using a sprocket is used. Of course, any power transmission mechanism such as a belt drive can be used.
[0027]
As can be seen from the configuration of the second embodiment, in the present invention, the function of adjusting the angle in the indexing device is not required for the rotary actuator, but the function is provided on the transmission unit side. Therefore, the rotary actuator can be arranged in the axial direction of the index shaft as in the first embodiment, but the gears 51 and 52 or other power transmission mechanisms are not required. Accordingly, the rotary actuator can be provided at an appropriate position where the rotational rotation can be transmitted to the transmission member 50, and the mounting position of the rotary actuator can be changed according to the place where the index device is used.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a first embodiment of an indexing device according to the present invention.
FIG. 2 is a cross-sectional view taken along the line AA in FIG.
FIG. 3 is an exploded cross-sectional view of the above embodiment.
FIG. 4 is a sectional view showing a second embodiment of the indexing device according to the present invention.
5 is a cross-sectional view taken along the line BB in FIG.
FIG. 6 is a cross-sectional view of a forward movement state (right half) and a backward movement state (left half) of a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Oscillation unit 2 Transmission unit 4 Indexing table unit 13 Output shaft 14 Stopper guide 20 Case body 21 Cylinder member 24 Cylinder hole 25 Piston 26, 27 Protrusion part 28, 29 Adjuster 35, 37 Projection part 36 Engagement groove 41 Positioning Guide 42 Table 43 Engaging groove 45 Engaging groove

Claims (4)

A swing unit, a transmission unit, and an indexing table unit are provided.
The swing unit is composed of a rotary actuator with a stopper guide attached to the output shaft.
The indexing table unit is configured by rotatably supporting a table having a plurality of engagement grooves on the back surface,
The transmission unit includes a cylinder hole opened at one end in a case body connected to the rotary actuator, and at least the stopper guide on a surface opposite to the opening side and facing the output shaft of the rotary actuator. A cylinder member provided with a convex part to be engaged is rotatably fitted, and a regulator is provided on the case body so that the convex part abuts at the rocking end when the cylinder member rotates and swings. Made possible
A piston fitted slidably in the cylinder bore, held at the stroke end of the hand, engages the engaging groove of the engaging groove and the fixed part of the table in the indexing table unit, in a fixed position to the table At the other stroke end, the protrusion on the stroke end side engages with the engagement groove of the cylinder member while maintaining the engagement state with the engagement groove of the table, and the rotational force is transmitted to the table. Provided with power transmission means to perform
An indexing device characterized by that. A swing unit, a transmission unit, and an indexing table unit are provided.
The swing unit is composed of a rotary actuator having a power transmission mechanism on the output shaft,
The indexing table unit is configured by rotatably supporting a table having a plurality of engagement grooves on the back surface,
The transmission unit includes a cylinder hole that opens at one end in a case body that connects the rotary actuators in a juxtaposed state, and from the output shaft of the rotary actuator on the side opposite to the opening side via the power transmission mechanism. A transmission member to which rotational force is transmitted and a cylinder member provided with a convex portion located on the peripheral side of the transmission member are rotatably fitted, and the convex portion swings in the case body when the cylinder member rotates and swings. An adjuster that abuts at the end is provided so that it can be moved forward and backward from the outside.
A piston fitted slidably in the cylinder bore, held at the stroke end of the hand, engages the engaging groove of the engaging groove and the fixed part of the table in the indexing table unit, in a fixed position to the table At the other stroke end, the protrusion on the stroke end side engages with the engagement groove of the cylinder member while maintaining the engagement with the engagement groove of the table, and transmits the rotational force to the table. Provided with power transmission means to perform,
An indexing device characterized by that. The indexing device according to claim 1 or 2,
Protruding parts that contact the adjuster are provided on the periphery of the cylinder member.
An indexing device characterized by that. The indexing device according to any one of claims 1 to 3,
As power transmission means in the transmission unit, at one stroke end of the piston, it engages with both the engagement groove of the table in the indexing table unit and the engagement groove of the positioning guide that rotatably supports the table. The protrusion that holds the table in a fixed position, and the protrusion engaged with the engagement groove of the table at the other stroke end of the piston retains its engagement state, and the cylinder hole of the cylinder member Engage with the engagement groove provided on the inner bottom, and provided with a protruding portion for transmitting the rotational force to the table,
An indexing device characterized by that.

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