JPS61116964A - Drive device - Google Patents

Abstract

PURPOSE:To travel a movable unit at a high speed with less noise by installing a linear motor shaft and a guide shaft between a pair of supports in parallel, and providing a linear motor coil and a bearing in the unit. CONSTITUTION:A drive device has a base 1 of rectangular plate shape, and stands supports 2 in parallel at both longitudinal ends. A linear motor shaft 3 and a spline shaft 4 as a guide shaft are coupled between the supports 2, installed horizontally to provide a movable unit 5. The unit 5 secures a cylindrical linear motor coil 6, a bearing 7 so as to be axially slidable and impossible to rotate in circumferential direction. A shock absorber 9 and a switch 10 are provided at the supports 2, and when the unit 5 collides with the absorber 9, a signal from the operated switch 10 is input to a controller to alter the moving direction of the unit 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a drive device used, for example, in an orthogonal robot.

[Technical background of the invention and its problems]

For example, in the orthogonal robot described above, a drive device is used that linearly drives a movable body to which a component holding device is attached, in order to take out a component from a predetermined position and supply it to a desired position.

Conventionally, the above-mentioned drive device has a pole screw shaft rotatably installed between a pair of supports that are erected apart from each other, and an id shaft installed parallel to the pole screw shaft. On the other hand, the movable body is provided with a pole screw nut that is screwed onto the pole screw shaft, and has an insertion hole into which the guide shaft is slidably inserted. The movable body is caused to run along the guide shaft by rotationally driving the single screw shaft with a drive source.

By the way, according to such a structure, in order to increase the traveling speed of the movable body, it is necessary to use an M-Runeso shaft with a large lead. In this case, the diameter of the pole screw shaft increases, resulting in problems such as an increase in the size of the device and the need to use a drive source with a large output. Moreover, the mechanical power transmission structure based on the screwing of the pole screw shaft and the pole screw nut has the disadvantage that the noise increases significantly as the speed increases. To provide a drive device that can run a movable body at high speed without increasing the output of the drive source or increasing noise.

[Summary of the invention]

In this invention, a linear motor shaft and a guide shaft are installed in parallel by connecting both ends to a pair of supports, and a linear motor filter that is externally fitted on the linear motor shaft and a linear motor filter that is slidably attached to the guide shaft is attached to a movable body. The movable body is provided with a bearing body that is fitted onto the outside of the movable body, and is a drive device that electrically moves the movable body.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. The drive device shown in FIG. 2
are installed in parallel. These pair of supports 2Vc include a linear motor shaft 3 made of a steel rod coated with copper,
A spline shaft 4 serving as a guide shaft connects both ends and is installed parallel to the horizontal direction and spaced apart from each other. A movable body 5 is provided on the linear motor shaft 3 and the spline shaft 4. That is, a cylindrical linear motor coil 6 and a linear motion bearing 7 as a bearing body are fixedly attached to the lower surface side of the movable body 5. Then, the movable body 5 externally fits the linear motor filter 6 onto the linear motor shaft 3,
A linear flexible bearing 7 is fitted onto the spline shaft 4. linear motion bearing 7
By fitting the t-spline shaft 4, the movable body 5
is slidable along the axial direction of the spline shaft 4, but cannot be rotated in the circumferential direction. In addition, a lead aS is connected to the linear motor coil 6, and when the linear motor coil 6 is energized by this lead IW8,
The linear motor coil 6, that is, the movable body 5 is driven by a magnetic field generated between the linear motor shaft 3 and the linear motor shaft 3.

On the other hand, in the pair of supports 2fC, the movable body 5 is
Each vehicle is provided with a shock absorber 9 that hits the vehicle when the vehicle travels to the end. Furthermore, a switch 10 that is activated when the movable body 5 collides with the shock absorber 9 is provided on the inner side of the pair of supports 2.

Signals from these switches 10 are input to a punt (not shown), and this controller controls, for example, changing the running direction of the movable body 5. Also,
On the upper surface of the movable body 5, there is a holding device 1 for taking out the parts indicated by chain lines in FIG. 2 from a predetermined position and supplying them to a desired position.
1 is attached by the mounting member 12 ◇ According to the drive device having such a structure, the movable body 5 generates a voltage between the linear motor coil 6 and the linear motor shaft 3 by energizing the linear motor coil 6. It is electrically driven to travel along the spline shaft 4 by the magnetic field generated by the spline shaft 4. therefore,
The movable body 5 can be made to travel at high speed simply by controlling the current flowing to the linear motor coil 6.

Moreover, since the power is electrically transmitted to the movable body 5,
Unlike the case where power is transmitted mechanically, the noise does not increase significantly when the movable body 5 travels at high speed.

Note that the present invention is not limited to the above-mentioned embodiment; for example, the guide shaft may be a round bar instead of the spline shaft, and in this case, the guide shaft may be made of synthetic resin or the like between the linear motor shaft and the trilinear motor filter. By installing sliding bearings and eliminating play between them, it is possible to run the movable body with high precision.

〔Effect of the invention〕

As described above, the present invention includes a linear motor shaft and a guide shaft installed in parallel between a pair of supports, and a linear motor filter fitted externally on the linear motor shaft on a movable body.
The guide shaft is provided with a bearing body that is slidably fitted on the outside, and the movable body is electrically moved by supplying power to the linear motor coil. It is possible to run in a slump. Therefore, unlike conventional mechanical drives, there is no need to increase the diameter of the girdle shaft or use a drive source with a large output in order to make the movable body travel at high speed, and in addition, noise increases significantly. Not really.

[Brief explanation of drawings]

Figures ff1li show one embodiment of the present invention, in which Figure 1 is a plan view, Figure 2 is a side view, and Figure 3 is a sectional view along the second factor I-@mVc. 2... Support body, 3... Linear motor shaft, 4... Spline shaft (guide shaft), 5... Movable body, 6... Linear motor filter, 7... Linear motion bearing (bearing body). (Applicant's representative Patent attorney Takehiko Suzue Figure 3)

Claims (1)

[Claims] A pair of supports stand apart and face each other, a linear motor shaft and a guide shaft are installed in parallel with both ends connected to these supports, and a cylindrical linear motor is fitted onto the linear motor shaft. 1. A drive device comprising: a coil; and a movable body provided with a bearing body slidably fitted onto the guide shaft and traveling along the guide shaft when the linear motor coil is energized.