JP3255508B2 - Rotating intermittent indexing 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 intermittent rotary indexing device for processing a conveyed article while stopping at a predetermined angular position while conveying an article to be processed along a circular orbit.

[0002]

2. Description of the Related Art An example of this kind of rotary intermittent indexing device is disclosed in Japanese Unexamined Patent Publication No. Hei.
86), the conveyed article is temporarily stopped while the article is conveyed along a circular orbit, and processing such as article inspection and assembling work is performed.

[0003] That is, the rotary intermittent indexing device disclosed in the above-mentioned publication discloses an index transporter that holds an article to be processed and transports it along a circular orbit, and a rotating arm that drives the index transporter. A rotating disk body having a rotating body, and a cam forming body for guiding the rotating arm, and the rotating arm is rotatably disposed on the peripheral edge of the rotating disk body, and is provided from a rotation fulcrum of the arm. A cam follower is provided at a predetermined distance, and a first engaging portion is provided at the tip of the rotating arm. Further, the indexing transport body includes a guide for guiding the revolving motion of the article, a work support provided at a peripheral portion of the guide, and provided so as to be paired with the rotating arm, A second engaging portion disposed on the support base and engaged with the first engaging portion of the rotating arm. Further, the cam forming body has a corrugated guide path between the carry-in position and the carry-out position. The cam follower of the rotating arm is caused to travel along the guide path while engaging the cam follower with the guide path. At the same time as reaching the predetermined position of the wavy valley, the force for transporting the second engaging portion of the indexing carrier in the revolving direction disappears, and at the same time when the cam follower passes through the predetermined position of the valley, A force for transporting the joint portion in the revolving direction is generated again to perform a predetermined intermittent motion.

[0004]

However, in such a conventional intermittent rotary indexing device, a cam follower is provided in the direction of the center of the rotating disk of the rotating arm, and the cam follower is guided by the cam forming body. Since the pivot arm is pivoted, the point of action of the pivot arm is located outward with respect to the pivoting power input to the cam follower, so that the device itself becomes large and pivots. Since the load input to the rotation support portion of the arm increases, the rigidity of the rotation support portion must be increased, and the device becomes heavy. Further, since the rotating disk rotates a rotating shaft provided at the center of the rotating disk, the driving torque must be increased in order to drive the rotating shaft. At the same time, since the rotating disk body has its central portion fixed and supported on the rotating shaft, there are various problems that rattling is likely to occur.

In view of the above-mentioned problems, the present invention is directed to a cam for stopping an article conveyed along a circular orbit at a predetermined angle and stopping at a predetermined angle when performing a predetermined process. An action point for transporting articles is formed on the inner side to reduce the size of the apparatus itself, and the rotating disk is driven at the outer periphery to achieve a downsized drive source and reliably support the drive source. It is an object to provide a rotation intermittent indexing device.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a ring-shaped rotary member which is rotated by driving a number of rollers provided on an outer peripheral portion thereof through a roller gear cam, and a ring-shaped rotary member. And a swing output member provided with a cam follower and rotatably supported by the first engagement portion, the first engagement portion protruding toward the center of the ring-shaped rotating body, and being rotatably supported by the first engagement portion. It has a second engaging portion fitted so as to be relatively rotatable, and has a table that is located on the inner peripheral side of the ring-shaped rotating body, moves along a circular orbit provided in the housing, and places a load. A rotation intermittent member and an inner cam which is concentrically provided on the housing at an outer peripheral portion of the ring-shaped rotating body, and abuts the follower at an appropriate position in the circumferential direction to rotate and swing the swing output member. And with Constitute by rolling supported on raceway surface formed roller provided on an outer peripheral portion of the ring-shaped rotary member in the housing.

[0007]

With the above construction, in the intermittent rotation indexing device according to the present invention, when the ring-shaped rotating body is rotationally driven via the roller gear cam and the roller, the swing output member is driven by the ring-shaped rotating body. Rotate. Then, the rotating intermittent member engaged with the swing output member via the first engaging portion and the second engaging portion moves along the circular orbit. Then, when the swing output member rotates by a predetermined angle when rotating, the cam follower of the swing output member contacts the internal cam to rotate the swing output member. Then, the swing output member swings while relatively moving and relatively rotating with the intermittent rotation member and the first and second engaging portions, and the swing output member and the intermittent rotation member are rotated by the relative movement and relative rotation. Can be relatively changed, and the rotation intermittent member can be temporarily stopped by the shape of the inscribed cam. Further, by changing a part of the circular track in the radial direction, the rotating intermittent member can be displaced in the radial direction at the deformed portion.

The first engaging portion serves as a point of action of the swing output member. The first engaging portion protrudes toward the center of the ring-shaped rotating body, so that the rigidity of the device is increased and the first engaging portion is extended. In addition, the weight and size of the device can be reduced. Further, since the outer peripheral portion of the ring-shaped rotating body is driven to rotate, the torque of the driving source can be small, and the driving source can be downsized accordingly. In addition, since the ring-shaped rotating body supports a number of rollers provided on the outer peripheral portion thereof by rolling on the raceway surface of the housing, the ring-shaped rotating body can be supported on the outer peripheral portion. It is possible to improve and prevent backlash.

[0009]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 7 show an intermittent rotary indexing device 10 according to an embodiment of the present invention. FIG. 1 is an enlarged cross-sectional view of a main part, FIG. 2 is a plan view, and FIG. FIG. 4 is a plan view, FIG. 5 is a side view, and FIG. 6 is a plan view showing an operating state of the swing output member and the rotation intermittent member. , FIG. 7 is a longitudinal sectional view of the same, FIG. 8 is a graph showing an operation state, and FIG. 9 is a schematic explanatory view of the present apparatus.

That is, the intermittent rotation indexing device 10 of this embodiment
As shown in FIG. 1 and FIG. 2, a housing 12 is provided so as to annularly cover the outer shell. A ring-shaped rotating body 14, a swing output member 16, a rotating intermittent member 18 and the like are concentrically provided in the annular housing 12. Is stored.

The ring-shaped rotator 14 is arranged in a floating state in the housing 12 via a roller 19. A large number of the rollers 19 are provided at equal intervals on the outer periphery of the ring-shaped rotating body 14. On the other hand, a part of the housing 12 protrudes outward to form a hollow driving part 12a, and the roller gear cam 2 disposed in the driving part 12a is formed.
0, the roller 19 comes into contact with the roller gear cam 20.
Is driven by a motor (not shown) to rotate the ring-shaped rotating body 14.

The inside of the ring-shaped rotator 14 is formed in a hollow shape, and a plurality (10 in this embodiment) is formed in the hollow portion.
Are output at equal intervals in the circumferential direction. The swing output member 16 has bearings 24, 2 at the upper and lower ends.
It is rotatably supported by the ring-shaped rotating body 14 via 4a. The bearings 26 and 26a are provided on the upper portion of the bearing 24 and the lower portion of the bearing 24a.
The bearings 26 and 26a roll on the inner periphery of the housing 12 so that the swing output member 16
Is restricted from moving in the radial direction. The roller 19 is adapted to roll on a track surface 27 formed on the lower surface of the housing 12, and
The outer peripheral portion of the ring-shaped rotary member 1 is supported by the rollers 19 and extends through bearings 24 and 24a.
4 is connected to the housing 12
Is supported in a floating state.

As shown in FIGS. 3 and 4, the swing output member 16 is moved toward the center of the
A pair of engaging plates 14b, 14b as the engaging portions are provided to project in parallel. Further, the rotation center line O of the swing output member 16 is provided.
A cutout portion 16a that is cutout outward is formed in the upper and lower central portion, and the upper and lower sides of the cutout portion 16a are circumferentially interposed with the rotation center line O as shown in FIG. A pair of cam followers 28, 28a are rotatably mounted at predetermined intervals in the direction perpendicular to the paper surface). One cam follower 28 is attached to the upper surface of the notch 16a, and the other cam follower 28a is
6a attached to the lower side, these cam followers 2
8, 28a are also separated at predetermined intervals in the vertical direction.

On the other hand, the rotating intermittent member 18 is
8a, 18b and a vertical wall 18c connecting the upper and lower walls 18a, 18b are formed in a U-shaped cross section, and are disposed so as to include the engaging plate 14b of the swing output member 16 therein. It has become. At this time, the engagement plate 14b
The upper and lower ends are slidably contacted with the upper and lower walls 18a, 18b. The upper side of the upper wall 18a and the lower wall 18
Projections 18d, 18e project below the b. These projections 18d, 18e are fitted in annular grooves 30, 30a as circular orbits concentric with the ring-shaped rotating body 14 formed on the upper and lower sides of the housing 12. Then, it is guided to move in the annular grooves 30, 30a.

A shaft 32 having a circular cross section as a second engaging portion is mounted between the upper and lower walls 18a, 18b so as to be directed vertically, and this shaft 32 is provided between the engaging plates 14b, 14b. Are arranged so as to be relatively rotatable. Further, a table 18f is formed so as to extend in the center direction of the ring-shaped rotating body 14 of the upper wall 18a.
An unillustrated conveyed object is placed or attached to f.

An inscribed cam 34 is mounted on the inner periphery of the housing 12 in correspondence with the mounting position of the cam followers 28, 28a. As shown in FIG. 7, the inscribed cam 34 is formed as a composite inscribed cam by an upper cam 34a slidingly contacting the upper cam follower 28 and a lower cam 34b slidingly contacting the lower cam follower 28a. The inscribed cam 34 has concavo-convex operating portions 34c and 34d formed at predetermined angular positions (two work stations A and B in this embodiment) of the ring-shaped rotating body 14, and these operating portions 34c and 34d are formed. Cam follower 2
The swing output member 16 swings due to the passage of 8, 28a, thereby changing the moving speed of the rotary intermittent member 18 and temporarily stopping the rotation.

With the above configuration, in the intermittent rotation indexing device 10 of this embodiment, when the roller gear cam 20 is driven, the rotation force is applied to the ring-shaped rotating body 1 via the roller 19.
4 and the ring-shaped rotator 14 is rotated at a constant speed. Oscillating output member 1 with rotation of ring-shaped rotator 14
6 rotates, and the swing output member 16 is attached to the engagement plates 14b, 1b.
The rotating intermittent member 18 engaged via the shaft 4b and the shaft 4b moves along the tubular groove 30a. At this time, except for the operating portions 34c and 34d of the inscribed cam 34, the intermittent rotation member 18 and the swing output member 16
While moving integrally with the rotating member 4, the rotating intermittent member 18 performs a constant velocity circular motion along the annular groove 30a.

Next, the swing output member 16 is connected to the internal cam 3.
4, the cam followers 28, 28a are moved to the upper cam 34a as shown in FIG.
The swing output member 16 is rotated (swinged) around the rotation center line O by sliding contact with the lower cam 34b. Then, the engaging plates 14b, 14b and the shaft 32, which are engaged with each other, relatively move and relatively rotate, so that a relative difference can be created between the movement amount of the swing output member 16 and the movement amount of the rotary intermittent member 18.

FIG. 8 is a graph showing the displacement of the table 18f when the ring-shaped rotator 14 is rotated in relation to the rotation angle of the ring-shaped rotator 14 and the elapsed time. As described above, the movement of the table 18f is changed between the stations A and B.
In the graph, the vertical axis indicates the rotation angle, and 0 degree and 360 degrees.
The degree is the same position. The elapsed time shown on the horizontal axis is divided into an initial portion, an intermediate portion, and an end portion of the operation portions 34c and 34d of the inscribed cam 34, and the respective break points are denoted by a, a.
.. are indicated by alphabets b, c,. In the graph, the work station A is in the section X0 to X2 depending on the rotation angle of the ring-shaped rotating body 14, and the work station B is in the section Y0.
~ Y2 section.

Hereinafter, the displacement of the table 18f will be sequentially described with reference to the elapsed time. The displacement of the table 18f will be described with reference to an example of a specific table T in which all steps are continuously shown in a graph.

(Section a to b) The table 18f performs a constant-speed circular motion in accordance with the rotation of the ring-shaped rotating body 14, and becomes a conveyance section of the conveyed object.

(Section bc) After reaching the work station A, the table 18f reaches the point X1 while being accelerated at the point X0 with the swing of the swing output member 16 (state T1 in FIG. 6).

(Section cd) Table 1 reaching point X1
8f stops at that position (T2 state in FIG. 6), and in this stopped state, processing such as inspection of an article or assembling work is performed.
The ring-shaped rotator 14 performs a constant-velocity circular motion even while the table 18f is stopped, and the table 18f that has been preceding during this stop section is overtaken by the ring-shaped rotator 14. .

(D-e section) In this section (state T3 in FIG. 6), the table 18f has already passed the ring-shaped rotating body 14, accelerated from the point X1 to the point X2, and caught up at the point e. A constant velocity circular motion is performed in synchronization with the ring-shaped rotating body 14.

Although the displacement of the table 18f has been described for the work station A, the table 18f is also displaced in the work station B in the same manner as in the section be.

Therefore, the intermittent rotation indexing device 10 of this embodiment
In this case, the intermittent indexing movement “movement → stop → movement → stop” of the table 18f is created from the ring-shaped rotating body 14 that continuously performs a constant velocity circular motion, and the stop position and the movement of the movement are determined. The trajectory can be made at any angle of 360 degrees. Further, it is possible to create a speed-change feed of “acceleration fast-forward → deceleration synchronous feed → acceleration fast-forward → deceleration synchronous feed”. In other words, in the indexing of the device 10, the stop position and the acceleration / deceleration range are determined by the contour shapes of the operating portions 34c and 34d of the inscribed cam 34, and the indexing angle and the stopping angle can be changed for each indexing station. Becomes

Further, in this embodiment, since a number of rollers 19 provided on the outer peripheral portion of the ring-shaped rotating body 14 are rolled and supported on the raceway surface 27 of the housing 12, the ring-shaped rotating body 1
4 can be supported on its outer periphery. For this reason,
The support strength of the ring-shaped rotating body 14 can be remarkably improved, and the backlash can be reliably prevented and smooth operation can be performed. By the way, the ring-shaped rotating body 14 is adapted to be rotated via a roller gear cam 20 and the roller 19, and since the roller gear cam 20 is a positive cam, there is no backlash and the ring-shaped rotating body 14 is smoothly rotated. Rotation is possible.

Further, in this embodiment, the oscillating rotation of the oscillating output member 16 which is the first follower uses a composite conjugate cam composed of the inner cam 34 and upper and lower cams 34a and 34b. Therefore, the backlash when the cam followers 28, 28a slide on the upper and lower cams 34a, 34b can be eliminated, and the start and stop of the table 18f can be smoothly and reliably performed.

Furthermore, in the present embodiment, the engaging plates 14b, 1 serving as points of action of the swing output member 16 respond to the swinging power input to the cam followers 28, 28a from the internal cam 34.
By arranging the engaging portion between the shaft 4b and the shaft 32 inward, the table 18f is arranged inside the ring-shaped rotating body 14, so that the device itself can be downsized and the swing output can be reduced. Since the load input to the rotation support portion of the member 16 is small, its rigidity can be made relatively small, and downsizing of the device can be achieved.

Further, since the driving force is input from the traction gear 20 to the gear 14a formed on the outer periphery of the ring-shaped rotating body 14, the driving torque of the motor 22 can be reduced. As a result, the size of the motor 22 can be reduced.

Further, since the ring-shaped rotating body 14 is formed in a ring shape, peripheral devices can be arranged in the hollow portion thereof, so that the apparatus itself can be made compact from this point, and the rotating body can be rotated. Since the oil can be effectively used from the inside to the outside when lubricating the part, the scattering of the oil can be prevented.

FIG. 10 shows another embodiment, in which the same components as those in the above embodiment are denoted by the same reference numerals, and the description thereof will be omitted. That is, in this embodiment, a part (P portion in FIG. 2) of the annular grooves 30, 30a for guiding the rotary intermittent member 18 is formed linearly, and the linear portions P form the annular grooves 30, 30.
a is changed in the radial direction.

Therefore, in this embodiment, the annular grooves 30,
When the rotary intermittent member 18 passes through the linear portion P formed at 30a, the rotary intermittent member 18, that is, the table 18f
Can be displaced in the radial direction, and other processing can be performed on the conveyed object by the radial change. For this reason,
A variety of changes in the movement of the conveyed object can be provided, and thus, the diversification of the work of processing the conveyed object can be achieved.

[0034]

As described above, in the intermittent rotation indexing device according to the present invention, the first engagement portion of the swing output member protrudes toward the center of the ring-shaped rotating body, and
The second engaging portion of the rotating intermittent member that moves along the circular orbit is engaged with the first engaging portion, and the cam follower provided on the swing output member is brought into sliding contact with the inscribed cam, thereby achieving constant velocity. Since the moving speed of the rotating intermittent member is relatively changed with the swing of the swing output member with respect to the rotating ring-shaped rotating body and temporarily stopped, the first engagement portion is The first engagement portion protrudes toward the center of the ring-shaped rotator, so that the rigidity of the device is increased, and the weight and size of the device are reduced. be able to. Further, since the outer periphery of the ring-shaped rotating body is rotatably driven via the roller gear cam and the roller, the torque of the driving source can be reduced, and accordingly, the driving source can be downsized and the backlash can be reduced. Enables smooth rotation with no gaps. Further, since the ring-shaped rotating body supports a number of rollers provided on the outer peripheral portion thereof by rolling on the raceway surface of the housing, the ring-shaped rotating body can be supported on the outer peripheral portion, so that the supporting strength is remarkably increased. Various excellent effects such as improvement and prevention of backlash can be obtained.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part showing an embodiment of a rotary intermittent indexing device according to the present invention.

FIG. 2 is a plan view showing an embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a main part showing one embodiment of the present invention.

FIG. 4 is a main part plan view showing one embodiment of the present invention.

FIG. 5 is a side view of a main part showing one embodiment of the present invention.

FIG. 6 is a plan view showing an operation state of a swing output member and a rotating intermittent member according to an embodiment of the present invention.

FIG. 7 is a vertical cross-sectional view illustrating an operation state of a swing output member and a rotating intermittent member according to an embodiment of the present invention.

FIG. 8 is a graph showing an operation state of one embodiment of the present invention.

FIG. 9 is a schematic explanatory view showing one embodiment of the present invention.

FIG. 10 is a plan view showing another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Intermittent rotation indexing device 12 Housing 14 Ring-shaped rotating body 14b Engagement plate (first engaging portion) 16 Swing output member 18 Intermittent rotation member 19 Roller 20 Roller gear cam 27 Track surface 28, 28a
Cam follower 30, 30a Annular groove (circular track) 32 Shaft (second engaging portion) 34 Internal cam

Claims (1)

(57) [Claims] 1. A ring-shaped rotating body which is rotated by driving a number of rollers provided on an outer peripheral portion thereof via a roller gear cam; and a rotatably supported by the ring-shaped rotating body. A swing output member provided with a cam follower and having a first engagement portion protruding toward the first engagement portion; and a second engagement portion fitted to the first engagement portion for relative movement and relative rotation. While moving along a circular orbit provided in the housing and located on the inner peripheral side of the ring-shaped rotating body,
A rotating intermittent member having a table on which a conveyed object is placed; and a concentrically-provided housing provided at an outer peripheral portion of the ring-shaped rotating body, and abutting on the follower at an appropriate position in the circumferential direction to output the swing output. An intermittent cam for rotating and swinging a member, wherein a roller provided on an outer peripheral portion of the ring-shaped rotating body is rolled and supported on a raceway surface formed in a housing.