JPH0320061Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a positioning device, and particularly to one for positioning the rotational direction of a cylindrical component having an irregularly shaped portion inside.

[Technical background of the invention]

For example, in the process of manufacturing a cathode for an electron tube, a tab (not shown) is welded to a metal cylindrical outer sleeve 2 with a ceramic flange 1 attached to the outer periphery, as shown in FIG. In order to keep the conditions for welding the sleeve 2 and the tab constant, the outer sleeve 2 is positioned in the rotational direction before welding.

In this case, the positioning of the outer sleeve 2 is as follows:
This is done by using three cut and raised portions 3 cut and raised at equal intervals inward from the lower end of the outer sleeve 2. Specifically, the outer sleeve 2
An engaging portion that engages with the cut-and-raised portion 3 of the outer sleeve 2 is formed in the fitting recess into which the outer sleeve 2 is fitted;
The outer sleeve 2 was rotated within the fitting recess so that its cut and raised portion 3 was engaged with the engaging portion of the fitting recess.

[Problems with background technology]

However, if the cut-and-raised portion 3 of the outer sleeve 2 is engaged with the engagement portion in the fitting recess as in the past, in the state before the engagement portion and the cut-and-raised portion 3 are engaged, Since the fit of the outer sleeve 2 into the fitting recess is incomplete, the outer sleeve 2 becomes unstable, and the posture of the outer sleeve 2 is not stable.
Rotate the outer sleeve 2 in the fitting recess, and when the engaging part in the fitting recess and the cut-and-raised part 3 of the outer sleeve 2 match, the outer sleeve 2
Automating the work of lowering the sleeve and engaging the cut and raised portion 3 of the outer sleeve 2 with the engaging portion in the fitting recess requires a complicated device, and furthermore, positioning takes time and, in some cases, In some cases, it was not possible to determine the position.

[Purpose of invention]

The present invention was devised in view of the above-mentioned points, and its purpose is to easily and reliably position a cylindrical part such as the outer sleeve 2 in the rotational direction that has an irregularly shaped part on the inside. It is.

[Summary of the idea]

The present invention relates to a positioning device for positioning the rotational direction of a cylindrical component such as an outer sleeve 2 having an irregularly shaped portion such as a cut-and-raised portion 3 on the inside, and the present invention relates to a positioning device for positioning the rotational direction of a cylindrical component such as an outer sleeve 2, etc.
1, a spline shaft 17 provided on the frame 11 so as to be movable up and down, and a pin portion 21 provided at the lower end of the spline shaft 17 and inserted into a cylindrical component such as the outer sleeve 2 at its tip. The pin portion 21 is provided with a positioning body such as a positioning rod 20, which has an engaging portion that engages with an irregularly shaped portion inside the component, and a stepping motor 24 that rotates the spline shaft 17. is lowered, the pin part 21 of the positioning body is inserted into the part and brought into contact with the irregularly shaped part, and the positioning body is attached to the frame 1 via the spline shaft 17.
1 and rotate the positioning body via the spline shaft 17 with the stepping motor 24, for example, the engagement groove 2 formed in the pin part 21.
At the same time, the engaging portion of the pin portion 21 is brought into alignment with the irregularly shaped portion such as the cut and raised portion 3 of the component, and the spline shaft 17 and the positioning body are lowered by their own weight to engage the engaging portion of the pin portion 21 with the irregularly shaped portion of the component. Furthermore, the stepping motor 24 rotates the component to a predetermined position via a positioning body, thereby positioning the component.

[Example of idea]

Embodiments of the positioning device of the present invention will be specifically described with reference to the drawings.

In FIG. 1, reference numeral 11 denotes a frame, and this frame 11 is adapted to be raised and lowered by a lifting drive mechanism 12, and a pair of upper and lower ball splines 13 and 14 are coaxially located on one side of the frame 11, respectively. A spline shaft 17 is inserted through the pair of ball splines 13 and 14, which are supported via bearings 15 and 16, and an upper ball spline 1 is attached to the upper end of the spline shaft 17.
A pair of ball splines 1 are fitted with a stopper 18 for the spline shaft 17, and the spline shaft 17 is rotatable.
3 and 14 so as to be able to rise and fall freely.

A positioning rod 20 as a positioning body is coaxially attached to the lower end of the spline shaft 17 via a holder 19. As shown in FIGS. 2 and 3, this positioning rod 20 has a pin portion 21 at its tip, which has a slightly smaller diameter than the inner diameter of the outer sleeve 2 as a cylindrical component shown in FIG. In this pin part 21, three engaging grooves 22 as engaging parts that engage with each cut and raised part 3 as an irregularly shaped part of the outer sleeve 2 are formed in parallel along the length direction of the pin part 21. has been done.

Further, a stepping motor 24 is attached to the upper part of the other side of the frame 11 via a bracket 23, and the shaft of this stepping motor 24 and the upper ball spline 13 are connected via gears 25 and 26. A spline shaft 17 is rotated by a ping motor 24 via an upper ball spline 13.

Note that 27 is a sensor that detects the position of the spline shaft 17 in the vertical direction.

Next, the operation will be explained.

As shown in FIGS. 4 and 5, the outer sleeve 2 has its lower end loosely fitted into the circular hole 29 of the support 28, and the flange 1 on its outer periphery is fitted into the recess 30 formed in the support 28. By fitting into the support body 28, it is rotatably supported by the support body 28, and moves together with the support body 28 directly below the positioning rod 20 which is in the raised state.

When the outer sleeve 2 moves directly below the positioning rod 20, the frame 11 is lowered to a predetermined position by the elevating drive mechanism 12, and the positioning rod 20 is moved directly under the stepping motor 2.
4, gears 25, 26, ball spline 1
3. It starts rotating via the spline shaft 17 and the holder 19, and as it descends, the pin portion 21 of the positioning rod 20 is inserted into the outer sleeve 2, as shown in FIGS. 4 and 6. The tip end surface contacts each cut-and-raised part 3 inside the lower end of the outer sleeve 2, and the positioning rod 20 rises relative to the frame 11 via the spline shaft 17, and due to rotation, the positioning rod 20 2
When each engagement groove 22 of the pin part 21 of 0 matches each cut-and-raised part 3 of the outer sleeve 2, the spline shaft 17 and the positioning rod 20 descend due to their own weight, as shown in FIGS. 5 and 7. Each engagement groove 22 of the pin portion 21 of the positioning rod 20 engages with each cut-and-raised portion 3 of the outer sleeve 2, and further, the positioning rod 20 rotates and the pin portion 2
The outer sleeve 2 rotates by the engagement of each engagement groove 22 of 1 with each cut-and-raised portion 3 of the outer sleeve 2, and at a preset rotation angle, the stepping motor 24 stops and the positioning rod 20 The outer sleeve 2 is also stopped via , thereby positioning the outer sleeve 2 in the rotational direction.The positioning of the outer sleeve 2 is confirmed by detecting the vertical position of the spline shaft 17 with the sensor 27. After that, the frame 11 is raised to a predetermined position by the elevating drive mechanism 12, and the pin portion 21 of the positioning rod 20 is attached to the outer sleeve 2.
Come out from within.

Then, the positioned outer sleeve 2
is moved together with the support 28 from directly below the positioning rod 20 to the next working position, and the tabs are welded.

In addition, in this embodiment, the engagement groove 2 is provided in the pin portion 21.
Although the outer sleeve 2 is positioned by forming the pin portion 21, the present invention is not limited to this, and by changing the shape of the pin portion 21, various parts can be positioned.

[Effect of idea]

As described above, according to the present invention, when the pin part of the positioning body is lowered into the cylindrical part through the frame and the spline shaft, and the positioning body is rotated by the stepping motor through the spline shaft, the pin The engaging part formed on the part can be engaged with the irregularly shaped part of the part, and the part can be rotated to a predetermined position using the stepping motor via the spline shaft and the positioning body to position the part. This can be done easily and reliably, and since the operation and structure of the device are simple, the positioning work is quick and there is no fear of failure.

[Brief explanation of the drawing]

Fig. 1 is a partially cut-away front view showing an embodiment of the positioning device of the present invention, Fig. 2 is a front view of a positioning rod as a positioning body, Fig. 3 is a bottom view thereof, and Figs. Figure 7 is a diagram for explaining the operation, Figures 4 and 5 are longitudinal sectional views, Figures 6 and 7 are horizontal sectional views corresponding to Figures 4 and 5; FIG. 8 is a perspective view of the outer sleeve as a component. 2... Outer sleeve as a component, 3...
Cut-and-raised part as an irregularly shaped part, 11... Frame, 17... Spline shaft, 20... Positioning rod as a positioning body, 21... Pin part, 22
. . . Engagement groove as an engagement portion, 24 . . . Stepping motor.

Claims (1)

[Claims for Utility Model Registration] A positioning device for positioning the rotation direction of a cylindrical part having an irregularly shaped part inside, comprising: a frame that is driven up and down; a spline shaft provided on the frame so as to be able to go up and down; a positioning body provided at the lower end of the spline shaft and having a pin portion at its tip to be inserted into the cylindrical component, and an engaging portion formed in the pin portion to engage with an irregularly shaped portion inside the component; A positioning device characterized by comprising a stepping motor that rotates a spline shaft.