JPH047862Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a nut runner position variable device, and more specifically, a nut runner that rotates nuts with a predetermined torque to accommodate different nut arrangements depending on the workpiece. This invention relates to a nut runner position variable device. This is used, for example, in the field of assembling a dust cover to an automobile accelerator member.

[Prior art]

Many automobile parts are completed by assembling a plurality of members. In the parts assembly assembly process, nut runners are fixedly arranged in accordance with the tightening of a specific workpiece, and bolts and nuts are quickly tightened. However, such a nut runner cannot be applied to different workpieces, so a separate nut runner that can accommodate changes in the tightening position is used. One example is the one described in Japanese Patent Application Laid-Open No. 57-211435. This is applied to nut runners and multi-axis drill machines, and can process workpieces with different arrangement pitch circles of bolts and holes to be machined. In other words, since it is equipped with a tool moving means that basically has the function of reducing or enlarging the pitch from a certain uniform pitch state, tightening and drilling of nuts in different arrangements can be made more efficient by changing the arrangement of the nut runner. It is often done.

[Problem that the invention attempts to solve]

In the production of automobiles, for example, in the process of assembling a dust cover to an accelerator unit, bolts arranged in double rows are assembled with uniform tightening torque. However, different vehicle models have different bolt arrangements, making it impossible for the above-mentioned nut runner to handle mixed production in which parts for multiple vehicle models are produced. As a result, there is a problem in that the speed and efficiency of the assembly work is impaired, and productivity is reduced. Therefore, in addition to mass production of a specific vehicle model, in an assembly process in which components of many vehicle models are assembled, a nut runner is desired that can handle workpieces with dissimilar bolt arrangements by changing their positions.

The present invention was developed in view of these problems, and its purpose is to simplify the machining format by reducing the number of objects to be machined simultaneously, to be able to handle a large number of patterns of machining objects in parts of many car models, and to be able to handle a variety of patterns. Enables tightening and streamlines the assembly process.
It is an object of the present invention to provide a nut runner position variable device capable of improving productivity in assembly line operations for multi-mix production.

(Means for Solving the Problems) The present invention for solving the above problems is characterized by a rotating plate that rotates while being guided by an arcuate base, and a rotating plate formed on the rotating plate. The device has a displacement plate that moves along a radial groove, a nut runner is attached to the displacement plate, and the nut runner is moved in the circumferential direction of the arcuate base. a runner sorting means for distributing and moving the nut runner; an angular position changing drive means for changing the angular position of the nut runner by adjusting the amount of movement in the circumferential direction at the distributed position; a stopper mechanism for variably regulating angular position change; a radial displacement means for displacing the nut runner in the radial direction of the arc-shaped base; and a radial displacement means for variably displacing the nut runner in the radial direction of the circular base. A stopper mechanism is provided for regulating the temperature.

[Effect]

When the runner sorting means is activated, the rotary plate is guided by the arc-shaped base and rotates, and the nut runners attached to the rotary plate are distributed and moved in the circumferential direction via the displacement plate. When the angular position change drive means is operated to adjust the amount of movement in the circumferential direction, the rotation of the rotary plate is restricted at the selected position by the stopper mechanism, and the angular position of the nut runner is changed. Subsequently, when the radial displacement means is actuated to move the displacement plate along the radial groove, the displacement plate is moved to the position selected by the stopper mechanism. This operation allows the nut runner to move to a desired position and tighten the nuts, making it possible to accommodate different nut arrangements.

[Effect of idea]

The nut runner position variable device of the present invention includes a runner sorting means, an angular position changing drive means,
Since a stopper mechanism that regulates the angular position of the nut runner, a radial displacement means, and a stopper mechanism that regulates the radial displacement of the nut runner are provided, the arrangement of the nut runner can be easily and variously changed, and many bolts and nuts can be arranged in different ways. It can be applied to various processing objects. Since the number of objects to be processed simultaneously in one cycle is reduced, it is possible to downsize the device, and it becomes easy to introduce mass production and multi-mix production lines.

〔Example〕

The present invention will be described in detail below based on examples thereof. The nut runner position variable device 1 shown in FIG. 1 consists of a pair of nut runner devices 2A and 2B installed at symmetrical positions with an axis N as a boundary.

In these nut runner devices 2A and 2B, the number of installed nut runners 3A and 3B is one, which is fewer than the conventional one, and the functions that can be applied to different nut arrangements are expanded, and the device is made smaller. ing. The illustrated nut runner device 2A,
2B, the nut runner 3A is located at point A and the nut runner 3B is located at point B, and when moved, they are located at points C and D. Note that these nut runners 3A and 3B are tools for tightening bolts and nuts and integrating a plurality of members, and are provided with a rotational drive source such as an air motor (not shown) inside. The nut runner device 2A is composed of a mounting portion 4A and a variable position portion 5A. Natsutranna 2
B has a similar structure, and one cycle of nut tightening is performed at four positions A to D in one nut arrangement. Note that the following description of the configuration is intended for the nut runner device 2A.

Mounting part 4 of the nut runner device 2A shown in FIG.
In the case of A, the third
An insertion member 7a shown in the figure is fixed, an arc-shaped base 7 is attached thereon, and the circumference of a rotary plate 8 is sandwiched between the arc-shaped base 7 and the insertion member 7a. is supported so as to be guided and rotated by the arcuate base 7. The rotary plate 8 shown in FIGS. 1 and 2 is provided with a radial groove 9, and a displacement plate 10, which is a movable base, is fitted into the radial groove 9. The displacement plate 10 and the nut runner 3A are integrated by a mounting member (not shown), and due to angular displacement due to circumferential movement of the rotating plate 8 and radial displacement along the radial groove 9 of the displacement plate 10, The nut runner 3A is now moved to the scheduled position.

The above-mentioned variable position parts 5A and 5B are provided with a runner distribution means 11, which includes a cylinder 12 for switching shown in FIG. ,
It consists of a sliding member 15, which is a spacer, rotatably connected by a pin shaft 14. Note that the sliding member 15 is fixed and integrated with the rotating plate 8. Therefore, in the runner sorting means 11, the pressing force and tensile force due to expansion and contraction of the cylinder 12 are transmitted to the rotary plate 8 via the pin shaft 14 and the sliding member 15, and the rotary plate 8 is connected to the pin shaft. 14 in the circumferential direction along a locus M (see FIG. 2).

The cylinder 12 is attached at its front end position to the upper part of a mounting plate 16, and at the lower part of the mounting plate is a cylinder which is an angular position changing drive means to be able to accommodate nut arrangements of different dimensions depending on different vehicle models. 17 is installed. In this way, the cylinder 12 and cylinder 17 are integrated,
Further, the mounting plate 16 is held so as to be swingable about a fulcrum shaft 18 via a swinging member 19 that holds a cylinder 17 . Note that the above-mentioned fulcrum shaft 18 is coupled to the end of the pedestal 20 as shown in the figure, and the fulcrum shaft 18 is connected to the end of the pedestal 20.
The other end portion is integrated with the common base plate 6 via the insertion member 20a. As a result, when the cylinder 12 expands and contracts, the inactive cylinder 17
Since cylinder 8 and mounting plate 16 are connected, cylinder 1
The second rod 12a moves forward and backward with reference to the mounting plate 16. On the other hand, the expansion and contraction of the cylinder 17 is performed based on the fulcrum shaft 18, and the expansion and contraction is performed by the mounting plate 16 and the rod 1.
It is transmitted to the rotating plate 8 via 2a. Also, the second
The cylinder 12 shown in the figure is in a contracted state, and the stopper member 21 is attached to the front surface of the mounting plate 16.
It comes into contact with an adjustable stopper surface 22 attached to the overhanging portion 13a of the tip member 13, thereby regulating the maximum contracted position of the tip member 13.

As described above, after the nut runner 3A is distributed and moved close to the required position through the rotation of the rotation plate 8 due to the expansion and contraction of the cylinder 12 in the runner distribution means 11, the circle of the rotation plate 8 is moved at the distribution position. The amount of movement in the circumferential direction is adjusted. In this adjustment, the angular position changing driving means 17 is expanded and contracted in order to perform a minute angular displacement that enables accurate positioning of the nut runner 3A.

As shown in FIG. 2, a stopper mechanism 23 is provided in the variable position portion 5A in order to variably restrict minute angular displacement of the nut runner 3A due to expansion and contraction of the cylinder 17. On the other hand, a stopper holding member 24, through which the swinging member 19 described above passes and which moves together with the cylinder 17, is attached to the rear end of the cylinder 17, and the stopper surfaces 25, 26, 27 is formed. In addition,
The stopper surface 25 is formed on one end of the bolt 28, and the stopper surfaces 26 and 27 are formed on both end surfaces of the bolt 29. The stopper mechanism 23 includes cylinders 31 and 32.
, movable stopper members 34 and 35 attached thereto, and a stopper member 33 fixed to an extension of the stopper case 30.

The cylinders 31 and 32 are installed inside the stopper case 30. The three stopper surfaces 25, 2 mentioned above
One surface of any one of 6 and 27 is the stopper member 3
3, 34, 35 and the movement of the cylinder 17;
That is, minute angular displacement of the nut runner 3A can be restricted. In this example, the stopper member 33 is made thin so as to increase the amount of movement in the direction of the arrow 36, and the stopper member 34 is made thick so as to reduce the amount of movement in the same direction. The length is determined so as to be regulated in the direction of arrow 37.

The radial displacement means 38 shown in FIG. 2 includes a displacement plate 10 integrated with the nut runner 3A, and a cylinder 39 for displacing the displacement plate 10 along the radial groove 9.
It is composed of The radial displacement means 38 shown in FIG. 4 and FIG.
The displacement member 41 attached to the cylinder 39
It is connected to the tip of the rod 39a. Therefore, when the cylinder 39 expands and contracts, the displacement plate 10 can be moved forward and backward in the radial direction. Note that bolts 44 and 45 are attached to the displacement member 41, and variable stopper surfaces 42 and 43 are formed on the end faces thereof. As described above, with the operation of the runner distribution means 11 and the angular position change drive means 17, the movement position of the nut runner 3A in the circumferential direction connects the predetermined position A point with the center of the rotary plate 8 in FIG. It is also brought onto the line P shown in . Similarly, in the case of the nut runner device 2B, it becomes possible to displace the nut runner 3B to point B.

Stopper mechanism 46 shown in FIGS. 4 and 5
Nut runner 3A by radial displacement means 38
This is for variably regulating the radial displacement of the rotating plate 8. In the stopper mechanism 46, a cylinder 47 is attached to one extended end of the mounting bracket 40, a movable stopper member 48 is attached to the tip of a rod 47a of the cylinder 47, and further, a stopper member 48 is attached at a position close to the cylinder 39. A stopper member 49 is secured to the mounting bracket 40. As a result, the above-mentioned two stopper surfaces 4
2 or 43 comes into contact with a stopper member to restrict movement due to expansion and contraction of the cylinder 47, that is, radial displacement of the rotary plate 8 of the nut runner 3A. In addition, in this example, the stopper member 49
is made thin to increase the amount of movement in the direction of arrow 50, and the stopper member 48 is made thick to reduce the amount of movement in the same direction.
When nut runner 9 is fully extended, the displacement of displacement plate 10 and nut runner 3A in the direction of arrow 51 is designed to be at the restricted position.

According to the nut runner position variable device having such a configuration, the pair of nut runners 3
A, 3B can be moved to a predetermined position and the nut can be tightened. The four points shown in FIG. 6 are point A where the nut runner 3A is located in the nut runner device 2A, point B where the nut runner 3B is located in the nut runner device 2B, and points C and D of the nut runners 3A and 3B to be moved to next. The variable position device 1 tightens the nuts in one cycle, or is a part of an X group of nuts. This X group is used, for example, when a dust cover is fastened to an accelerator unit adopted in one car model, and the pair of nut runner devices 2A and 2B in this example are used in Y group and Z group, which are other car models. It is also applied to a nut array consisting of four points each of points E to H and points I to L to tighten the nut.

First, an operator lifts the nut runner position variable device 1 consisting of the nut runner devices 2A and 2B,
For example, when the nut runners 3A and 3B are attached to a workpiece placed on a pallet and flowing in a certain direction, the nut runners 3A and 3B tighten each nut with a certain torque at points A and B of the X group.

In order to tighten the remaining two nuts, the nut runners 3A and 3B are operated as follows and moved to points C and D. In the nut runner device 2A, the switching cylinder 12 in the runner distribution means 11 is extended, and the stopper surface 22 located on the overhanging portion 13a of the tip member 13 shown in FIG. The rotary plate 8 is moved along the base 7 via the sliding member 15 as shown by the arrow 5.
Sort and move in two directions. At this time, the cylinder, which is the angular position changing driving means 17 shown in FIG.
While swinging around the fulcrum shaft 18, it reaches a position close to point C. Subsequently, the adjustment cylinder 17 with a small stroke is reduced, and the cylinder 12
and the mounting plate 16 swing together and are angularly displaced in the direction approaching the above-mentioned point C. At this time, the stopper surface 25 of the stopper mechanism 23 shown in FIG. 2 comes into contact with the stopper member 33 to prevent further movement, and the nut runner 3A reaches point C.

Simultaneously with the operation of the nut runner 3A, the nut runner 3B located at point B has its cylinder 12B reduced and is moved to a new point D. Its operation is
The rotary plate 8 is rotated in the direction of arrow 55, and the stopper surface 22 shown in FIG. 2 comes into contact with the stopper member 21, thereby regulating the maximum contraction position. Subsequently, the cylinder 17 is extended, but at that time, the stopper surface 27 of the stopper mechanism 23 shown in FIG.
is moved to the planned position, point D, with high precision.

As mentioned above, a pair of nut runners 3A, 3B
is moved to multiple bolt locations on the workpiece and is driven by an air motor to tighten the nuts.

As shown in FIGS. 7 and 8, when the nut runner device 2A changes the nut arrangement from the X group of one vehicle model to the Y group nut arrangement of another vehicle model and tightens the nuts, the nut runner 3A changes from the nut arrangement of the X group of one vehicle model to the Y group nut arrangement of another vehicle model. It is necessary to move from the point to the E point of the Y group. The cylinder 12A of the runner distribution means 11 shown in FIG. 7 is contracted as shown in FIG. 8, and the rotating plate 8 is rotated in the direction of arrow 53. Subsequently, the cylinder 17, which is the angular position change drive means, is extended. At that time, the stopper mechanism 23 shown in FIG.
The stopper surface 26 in comes into contact with the stopper member 34 and is regulated. The nut runner 3A is placed on a straight line connecting point E and the center of the rotating plate 8. In the case of the same arrangement, since the radial positions of point A and point C are often the same, there is no need for radial displacement by the radial displacement means 38. However, since point E is closer to the center of the rotating plate 8 than points C and A,
The cylinder 39 is contracted and radially displaced in the direction of arrow 54. At this time, the cylinder 47 of the stopper mechanism 46 shown in FIG. 4 is extended, and the stopper member 48 advances. As a result, the displacement of the cylinder 39 in the direction of the arrow 54 (see FIG. 8) is regulated by the stopper surface 43 coming into contact with the stopper member 48 before the stopper member 49 and the stopper surface 42 are regulated, and the nut runner 3A is regulated with high accuracy. Then it is moved to the planned location, point E, and the nut is tightened. Nut runner device 2B is similarly moved, and nut runner 3B is moved from point D of group X to point F of group Y shown in FIG. In this way, the nut arrangement can be changed from the X group to the Y group nut arrangement. Further, the positions of the nut runners 3A and 3B can be easily changed in accordance with nut arrangements such as from Y group to Z group, from Z group to X group, or from X group again to Y group.

[Brief explanation of the drawing]

Fig. 1 is an overall plan view of the nut runner position variable device of the present invention, Fig. 2 is an enlarged view of one side of the nut runner position variable device, Fig. 3 is a sectional view taken along the line - - of Fig. 1, and Fig. 4 is a radial direction. A plan view of the displacement means, FIG. 5 is a cross-sectional view taken along the - line in FIG. It is an explanatory diagram of the replacement operation. 1... Nut runner position variable device, 3A, 3B
... Nut runner, 7 ... Arc-shaped base, 8 ... Rotating plate, 9 ... Radial groove, 10 ... Displacement plate, 11 ...
...Runner distribution means, 17... Angular position change drive means (cylinder), 23, 46... Stopper mechanism,
38...Radial displacement means.

Claims (1)

[Claim for Utility Model Registration] It has a rotary plate that rotates while being guided by an arc-shaped base, and a displacement plate that moves along a radial groove formed in the rotary plate, and a nut runner is attached to the displacement plate. is mounted on the nut runner, and is adapted to change the position of the nut runner, comprising runner distribution means for distributing and moving the nut runner in the circumferential direction of the arcuate base; an angular position changing drive means for changing the angular position of the nut runner by adjusting the amount of movement; a stopper mechanism for variably regulating the angular position change of the nut runner by the angular position changing driving means; A nut runner position variable device comprising: a radial displacement means for displacing the base in the radial direction; and a stopper mechanism for variably regulating the radial displacement of the nut runner by the radial displacement means. .