JPH0446698B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a positioning device for adjusting the distance between the axes of multiple tools. For example, when tightening a nut using multiple nut runners, each Used to change and adjust the distance between the nut runner's axes.

(Prior art) Conventionally, a tightening device using a nut runner has been used to tighten or loosen bolts or nuts attached to workpieces that are sequentially conveyed by a conveyor line, etc., and when multiple nuts are attached to one workpiece. A plurality of nut runners are installed correspondingly. In recent years, flexibility has been required for factory equipment to support high-mix, low-volume production, and even in the aforementioned tightening devices, the spacing between the shafts of the nut runner has been increased to accommodate different types of workpieces with different nut mounting pitches. It is desired to be able to perform positioning by variably adjusting the distance.

In such a case, the adjustment positioning device may be one that supports each nut runner so that it can move in the pitch direction and is moved by a fluid pressure cylinder, etc. This increases the number of fluid pressure cylinders, making it difficult to downsize the device.Also, when multiple fluid pressure cylinders are used for positioning at multiple positions, it is difficult to control them, making it difficult to perform accurate positioning. It is.

(Problems to be Solved by the Invention) The present invention has been made in view of the above-mentioned problems. When using a plurality of tools such as nut runners, the distance between the axes of each tool is adjusted and positioned. The purpose of this invention is to provide a small and easily controllable device that can perform the following functions.

(Technical means for solving the problem) The technical means of the present invention is that the device is rotatably attached to the device main body 1 and has a plurality of cam holes 11 on the rotating surface 10.
A worm wheel 8 is provided with a worm wheel 8 , a worm 21 is engaged with the worm wheel 8 and driven to rotate, and each shaft is parallel to each other and parallel to the axis of the worm wheel 8 and passes through the cam hole 11 . a plurality of tools 12 that are slidably provided;
It is characterized by comprising a slide device 19 that supports each tool 12 so that it can reciprocate only in one direction parallel to the rotating surface of the worm wheel 8.

(Example) The present invention will be described below based on an example with reference to the drawings.

In FIGS. 1 to 3, the device main body 1 is
A mounting plate 3 for mounting is welded to an end of a base plate 2 having a round hole 2a approximately in the center, and a shaft plate 6 having a rectangular shape in plan view has a cylindrical shaft 5 having a round hole 4 in the center. It is configured to be attached to the lower surface of the base plate 2 via spacer members 7, 7 at both ends with bolts (not shown). The worm wheel 8 has circular recesses 8a and 8b on the upper and lower surfaces, respectively, and a round hole 9 in the center.
A cam plate 10 having a circular outer circumference is fitted into the circular recess 8a on the upper surface thereof, and is fixed to each other by bolts (not shown), and a cylindrical shaft 5 is fitted into the circular recess 8b on the lower surface. Thus, the worm wheel 8 and the cam plate 10 are mounted between the base plate 2 and the shaft plate 6 so that they can rotate integrally about the cylindrical shaft 5 as a rotation axis.

The cam plate 10 is provided with two cam holes 11, 11 that are symmetrical to each other with respect to a center point P, and the cam hole 11 has a circle C that is approximately equal to the outer circumference of a small diameter stepped portion 13a, which will be described later. has an inner circumferential surface that has the same shape as the trajectory of the outer circumference when rotated to the left through an angle of 90 degrees while gradually increasing the distance from the center point P. 2 nutrunners 12,
12 are a main body portion 12a and a shaft portion 12b, respectively.
The axes of the shaft portions 12b are arranged parallel to each other and parallel to the rotation axis of the worm wheel 8.

Referring also to FIG. 4, the small diameter stepped portion 13a of the fixed cylinder 13 attached to the mounting plate 12c of the main body portion 12a is slidably fitted into the inner peripheral surface of the cam hole 11 from above, and the collar 14 is externally fitted into the tip step portion 13b of the fixed tube 13 from below, and both are fixed by a set screw 15. The shaft 16 penetrates through the fixed tube 13 and the collar 14, and has a socket at the tip. It is connected to the rotational attachment 17 provided with the portion 17a so as to transmit rotational force. In addition, 13c is the set screw 1
5 is a groove to be engaged, and 17b is a pin for preventing slippage.

In particular, with reference to FIGS. 1 and 2, the upper surface of the base plate 2 has a center point P and both shaft portions 1.
Slide rails 18a, 18a are attached at symmetrical positions on a diameter line passing through the axis of the slide rail 18a, and a guide member 18b having a U-shaped cross section is movable in sliding contact with the top surface and both side surfaces of the slide rail 18a. Each nut runner 12 is reciprocated only in the diametrical direction of the worm wheel 8 with respect to the device main body 1 by the slide device 19 consisting of the slide rail 18a and the guide member 18b. Possibly held.

Particularly with reference to FIGS. 1 and 3, a mounting base 20 having an L-shaped cross section is attached to the lower surface of the shaft plate 6, and a worm 21 that engages with the worm wheel 8 is attached to this mounting base 20. An air motor 23 is rotatably supported by bearing brackets 22a and 22b and also attached to the mounting base 20.
The rotational force of the worm 21 is transmitted to the shaft 21a of the worm 21.

Further, on the outer circumferential portion of the worm wheel 8 opposite to the portion that engages with the worm 21, a light shielding plate 25 provided with a through hole 24 for detecting the rotational position is attached at an angle of 180° around the center point P. A large number of sensors 26 detect this through hole 24.
are attached to a bracket 27 attached to the lower surface of the shaft plate 6 at the respective required rotational angular positions.

All of these are attached to a required main body device A with bolts 3a.

Next, the operation of the positioning device configured as described above will be explained.

The two nut runners 12 each have a cam plate 1
0 and a slide device 19, and the distance between their axes, that is, the distance between the centers of both socket portions 17a, 17a, is determined by the position of the cam hole 11 of the cam plate 10. There is. To change the distance between the axes, the air motor 23 is rotated, thereby rotating the worm 21 and the worm wheel 8 that meshes with the worm 21. The cam plate 10 rotates accordingly, and the cam hole 1
1 is changed and the cam plate 10 rotates to the right in FIG. 3, the smaller diameter step portion 13a is pushed outward in the radial direction and the distance between the axes becomes larger. Therefore, if an appropriate control valve and control device are used to rotate, stop, or change the rotational speed of the air motor 23 based on the signal from the sensor 26, any axis set in advance by the sensor 26 can be used. Positioning can be performed by variably adjusting the distance between the two.

Furthermore, since the rotation of the worm wheel 8 is regulated by the worm 21, there is no possibility that the distance between the axes of the nut runner 12 will change even if an external force is applied to the nut runner 12 after positioning. this is,
By using an air motor 23 with a brake, it becomes more reliable and the positioning accuracy also improves. Since each cam hole 11 is provided point-symmetrically with respect to the center point P, the distance between the axes is determined by the center point P.
Changes in size are made centering on , making it easy to align the mounting position of this device and position the workpiece.

Further, it is easy to process the cam holes 11 in the cam plate 10. The nut runner 12 is rotated by the rotation of the cam plate 10.
Since position adjustment and positioning are performed at the same time,
There is no need to provide separate devices for position adjustment and positioning of the nut runner 12, and only one drive source is required to drive it, so the structure is simple and compact, easy to control, and less likely to break down and require less maintenance. This has the effect of making it easy. Also, even if the number of Natsutranner 12 increases further,
Worm wheel 8 and cam plate 1 of appropriate size
A required number of cam holes 11 of an appropriate shape may be provided in the hole.

Further, the cam plate 10 may be integrated with the worm wheel 8.

In the above embodiment, the air motor 23 was used as the drive source, but a hydraulic motor, electric step motor, DC motor, etc. may be used instead. Further, instead of the nut runner 12, other tools such as a drill machine or a stamping machine may be used to variably adjust the distance between their axes for positioning.

(Effects) According to the present invention, it is possible to obtain a compact and easily controllable device that can adjust and position the distance between the axes of a plurality of tools. The distance between the axes of the tool is adjusted and positioned by the rotation of the worm wheel, and since the rotation of the worm wheel is regulated by the worm, the distance between the axes of the tool can be adjusted and positioned by the rotation of the worm wheel. The distance between them is reliably maintained, and the structure is simple from this point of view as well. In addition, by providing each cam hole on the rotating surface of the worm wheel point-symmetrically with respect to the center point of the worm wheel, the center point remains constant regardless of changes in the distance between the axes. It becomes easy to align the installation position of the device and position the workpiece, which facilitates both manufacturing and use.

Further, according to the present invention, the tool is inserted through the cam hole provided in the worm wheel, so that the tool is moved toward the rotating surface of the worm wheel by the cam hole, more precisely, by the hole wall of the cam hole. The movement of the tool in the direction perpendicular to the direction of the rotating surface is restricted by the slide device, and the distance between the axes of the plurality of tools can be freely adjusted by the worm wheel and the slide device. Even though the tools can be adjusted, they are reliably supported at the adjusted position, and there is no special need for a support device for supporting a plurality of tools, which makes the structure that much simpler.

Furthermore, according to the present invention, the worm wheel is sandwiched between a base plate and a shaft plate integrally fixed thereto, and is pivotally supported by a cylindrical shaft provided on the shaft plate. Since the worm wheel can be mounted on a cylindrical shaft, there is no need for a complicated bearing device to support the worm wheel, and multiple tools can be passed through the cylindrical shaft that supports the worm wheel. Overall, it can be manufactured inexpensively and compactly.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is a side sectional view partially taken from the line - in FIG. 1, and FIG. 3 is a side sectional view partially taken from the line - in FIG. FIG. 4 is an enlarged cross-sectional view of a part of the shaft portion of the nut runner. 1... Device main body, 8... Worm wheel, 1
0...Cam plate (rotating surface), 11...Cam hole, 12
... Nut runner (tool), 18a ... Slide rail, 18b ... Guide member, 19 ... Slide device, 21 ... Worm, 23 ... Air motor.

Claims (1)

[Claims] 1. A worm wheel that is rotatably attached to the device main body and has a plurality of cam holes on its rotating surface, a worm that is engaged with and rotationally driven by the worm wheel, and whose axes are parallel to each other and that the worm wheel has a plurality of cam holes. It consists of a plurality of tools that are parallel to the axis and are provided through the cam hole, and a slide device that supports each of the tools so that they can reciprocate only in one direction parallel to the rotational surface of the worm wheel. , the worm wheel is mounted so as to be sandwiched between a base plate of the device main body and a shaft plate integrally fixed to the plate, and to be pivotally supported by a cylindrical shaft provided on the shaft plate. . A positioning device for adjusting the distance between axes of a plurality of tools, characterized in that the plurality of tools are attached so as to pass through a cylindrical shaft.