JPS6357148A - Positioning device for two-stage knock - Google Patents

Abstract

PURPOSE:To reduce a friction loss of a pin and a hole bush, by once stopping a movable side and knocking a knock pin so as to be fitted to a large contour hole and fine moved, till the peripheral surface of the pin comes into contact with the peripheral surface of the hole, thereafter knocking the pin in a rear stage so as to be fitted to a small contour hole. CONSTITUTION:A positioning unit 1 moves on a guide surface 3, and if the positioning unit 1 comes to be placed in an index position, a positioning device stops an oil hydraulic motor 4 by closing a limit switch while the positioning unit 1 in a predetermined position by applying a brake. Next, a limit switch is closed, and if a timer is placed in a time up position, the device, switching an oil path and connecting an oil hole 18 with a pressure oil source, opens an oil hole 19. Consequently, only a piston 10 advances performing the front stage knocking in which a pin 11 is fitted only to a large contour hole 22, and if the brake is released by closing only a proximity switch 28, the positioning unit 1 lowers until the pin 11 comes into contact with the generatrix of the large contour hole 22 on a straight line with the generatrix of a small contour hole 23. Next the switch 28 is closed, and if the timer is placed in a time up position, the device, switching the oil path, performs the rear stage knocking in which the pin 11 is fitted to the small contour hole 23, and the positioning unit 1 is accurately positioned.

Description

[Detailed description of the invention] [Industrial application field] This invention is a dowel pin for machine tools, etc.

and a two-stage knock positioning device using positioning holes.

[Prior Art] In the case of a positioning device using a dowel pin and a positioning hole in a machine tool, etc., the dowel pin is tapered for fine adjustment, the positioning hole is also made a tapered hole, and the positioning knock is performed using the tapered surfaces of both as a guide. There is.

[Point IA to be solved by the invention] Accurate positioning using the tapered surfaces of both the positioning hole and the dowel pin poses no problem as long as the stop position on the movable side is within a certain accuracy, but if the movable side If the accuracy of the stop position on the side is poor, a large reaction force acts on the positioning knock caused by the guidance of the tapered surface during final positioning. As a result, the shock noise is loud and the dowel pins and positioning hole bushings are subject to severe wear and tear.

In this invention, neither the positioning hole nor the dowel pin is tapered, and the first positioning hole has a large diameter hole at the front and a small diameter hole at the back communicating in the axial direction. 1.1 Make both holes eccentric to each other, and make the generatrix of the large diameter hole and the generatrix of the small diameter hole in a straight line. The dowel bottle has a small diameter that matches the small diameter hole, and for predetermined positioning, it is first fitted into only the large diameter hole, and then the object to be positioned is adjusted and moved slightly, and its circumferential surface is aligned with the generatrix of the small diameter hole. It is designed to be knocked in two stages by making contact with the straight line bus bar and then inserting it into a small diameter hole.

[Operation] In the positioning operation, first, the movable side, which is the body to be positioned, is moved to the positioning position relative to the fixed side, and then stopped.

At that stage, the knock bottle may be stopped at a position within a range where it can fit into the large diameter hole. Therefore, knock in the front stage so that the knock pin fits only into the large diameter hole.

Next, the movable side is slightly moved until the circumferential surface of the knock bottle contacts the circumferential surface of the large diameter hole. The contact generatrix in this case is in line with the generatrix of the small diameter hole.

Therefore, when the knock bottle is knocked at a later stage, the knock bottle can be smoothly inserted into the small diameter hole as it is. After a while, accurate positioning is achieved.

[Example] A positioning device according to an example of the present invention will be described with reference to the drawings.

In FIG. 1, a movable body 1 to be positioned is configured to slide vertically on a guide surface 3 of a guide body 2. As shown in FIG. The object to be positioned 1 is equipped with a hydraulic motor 4, a pinion (not shown) driven by the hydraulic motor 4, and a knock pin device 5 shown in FIG.

The guide body 2 is provided with a rack 6, and the pinion of the positioned body 1 is engaged with the rack 6. Further, the guide body 2 is provided with positioning hole bushes 7 having nine positioning holes at positions for determining the liquid level and positioning the dowel pin moving locus -E of the body 1 at a desired position.

The knock pin device 5 on the object 1 to be positioned is a double piston hydraulic cylinder, and a first piston 9 is inserted into the cylinder body 8 fixed to the object 1 to be positioned.
A second piston 10 is inserted into the piston 9, and the first piston 9 serves as the cylinder body of the second piston IO.

The tip of the second piston 10 becomes a knock bottle 11.

The distal end of the cylinder body 8 is guided by a guide sleeve portion 12 and protrudes from the object to be positioned l. The rear end of the second piston 10 protrudes from the cylinder body 8, and an inverted knock pin position detection object 13 is attached thereto.

The cylinder body 8 is provided with a first oil hole 15 communicating with the cylinder body front side oil chamber 14 and a second oil hole 17 communicating with the cylinder body rear side oil chamber 16. 4 oil holes 19 are drilled. The third oil hole 18 passes through an oil groove/oil hole drilled in the first piston 9 to the front oil chamber 20 of the piston, and the fourth oil hole 19 passes through an oil groove/oil hole drilled in the first piston 9. It communicates with the rear oil chamber 21 of the piston via an oil groove and an oil hole.

The oil groove is located either in the first piston 9 or in the third piston anywhere during the stroke. Fourth oil holes 18 and 19 are provided so as to pass through oil chambers 20 and 21 on both the front and rear sides of the first piston 9, respectively.

The positioning hole in the positioning hole bushing 7 is configured by a large diameter hole 22 at the front and a small diameter hole 23 at the back communicating in the axial direction.
The generatrix line is in line with the generatrix line, and the generatrix line is located at the bottom of the large inner surface. The diameter of the small diameter hole 23 matches the diameter of the dowel pin 11, and the positioning hole and the dowel pin are only attached and do not have a taper.

The dowel pin position is parallel to the piston axis of the detected object 13 and approaches the detected portion 25 having the hole 24. Third proximity switches 26, 27, and 28 are arranged in parallel, and the first proximity switch 26 closes when the detected part 25 faces, and the second proximity switch 26 closes when the detected part 25 faces. The third proximity switches 27 and 28 open when the detected portion 25 faces them.

Regarding the detected part 25 that is displaced integrally with the second piston 10, in the state of the latter stage knock that fits into the knock bottle 11 or the small diameter hole 23, the entire proximity switch 26, 27,
28, and in the pre-stage knocking state where the knock pin 11 is fitted only into the large diameter hole 22, the knock pin 11 is separated from the first proximity switch 26, the hole 2.1 faces the third proximity switch 28, and the knock pin 11 is inserted into the large diameter hole 22. In the retracted position where it has passed through hole 22,
It faces only the third proximity switch 28.

The operation and function of the above positioning device will be explained.

First, it is assumed that the knock pin 11 is inserted into the small diameter hole 23 and the object 1 to be positioned is in the indexed position fixed state. At that time, the hydraulic motor 4 is stopped and a brake (not shown) is operated. Then, only the first proximity switch 26 is closed and the first proximity switch 26 is closed. The fourth oil hole 15.19 is open, and the second oil hole 15.19 is open. The third oil holes 17 and 18 communicate with a pressure oil source.

Therefore, by switching the oil passage switching valve (not shown) by an external command, the first. The fourth oil hole 15.19 communicates with a pressure oil source, and the fourth oil hole 15.19 communicates with a pressure oil source. The third oil holes 17 and 18 are opened. Then, the first. The second pistons 9 and 10 move back together, and the dowel pin 11 also comes out of the large-diameter hole 22, suddenly reaching the retreat position, and the object to be positioned 1 slides on the guide surface 3 of the guide body 2. be in a state where you can get it. At that time, the second proximity switch 27
only is closed.

Due to this closed circuit 1j, when the brake is released, the hydraulic motor 4 is operated at the same time as 1j and 〒, and the pinion (1j) which meshes with the rack 6 is
(not shown) rotates and guides the object 1 to be positioned: 31
; move. When a predetermined index position is reached, a limit switch (not shown) is closed by the object 1 to be positioned, the hydraulic motor 4 is stopped, and at the same time the brake is activated, and the object 1 to be positioned is moved to the predetermined index position. Stops at the indexed position. In this state, the object to be positioned l is in a position where the knock pin [l can be inserted into at least the large diameter hole 22.

When the limit switch closes, the timer starts, and when the timer expires, the oil passage switching valve is switched.

The third oil hole 18 communicates with a pressure oil source, and the fourth oil hole 19 is open. As a result, only the second piston 10 moves forward, a pre-stage knock in which the knock pin 11 fits only into the large diameter hole 22 is performed, and only the third proximity switch 28 is closed. As a result, when the brake is released, the first positioning body l
is lowered by its own weight until the knock pin 11 contacts the lower peripheral surface of the large diameter hole 22, that is, the generatrix of the large diameter hole 22 that is in line with the generatrix of the small diameter hole 2:3.

In this state, the )y cup pin 11 is in a position that coincides with the small diameter hole 23.

The timer starts when the third proximity switch 28 closes, and when the timer expires, the oil passage switching valve is switched again.
The first oil hole 15 is opened, the second oil hole 17 communicates with the pressure oil source, the first piston 9 moves forward, and the knock pin U fits into the small diameter hole 23, thereby performing a second stage knock. , and the brakes are activated.

In this way, the object 1 to be positioned is accurately positioned and fixed at a predetermined position on the guide body 2.

In the embodiment described above, the object to be positioned 1 moves in the vertical direction, but the present invention can also be applied to cases in which the object to be positioned 1 moves in the water direction. In that case, instead of lowering the positioned body 1 between the front stage knock and the rear stage knock,
It may be moved using a power-driven feeding mechanism.

[Effects] In the present invention, since it is sufficient to temporarily stop the object to be positioned at a position where the knock pin can be inserted into the positioning hole having a diameter larger than that of the knock pin, the accuracy of the stopping position of the object to be positioned is exceptionally high. There's no need.

Moreover, since the positioning knock is performed using the linear generatrix of the positioning bush as a guide, the knock pin can be positioned smoothly and accurately.

Since the positioning dowel does not use a tapered surface as a guide, there is less shock noise and less wear and tear on the dowel pin and positioning hole bushing.

[Brief explanation of the drawing]

FIG. 1 is a front view of a positioning device according to an embodiment of the invention. FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIG. 3 is a front view of the positioning hole bushing. 1: Positioned body 2: Guide body: 3 = Guide surface 4: Hydraulic motor 5: Noseokbin device 6: Rack 7: Positioning six bushes 8 Niji cylinder body 9: First piston 10: Second piston I! Notsukubin
12: Guide sleeve part l3: Dowel pin position detected object 14 Niji cylinder main body front side oil chamber 15.17.18.19: 1st. Second. Third. Fourth oil hole 16: Cylinder main body rear oil chamber 20: First piston front oil chamber 21: First piston rear side oil chamber

Claims (1)

[Claims] A positioning hole formed in the guide body and consisting of a non-tapered large diameter hole and a small diameter hole, which communicate in the axial direction, are eccentric to each other, and whose generatrix lines are in a straight line; a positioning hole provided in the body to be positioned and which corresponds to the diameter of the small diameter hole. A small-diameter, non-tapered dowel pin; A drive device that knocks the dowel pin into two positions; a first position in which the dowel pin is inserted only into the large-diameter hole in the front; and a second position in which the dowel pin is inserted into the small-diameter hole in the back; A two-stage knock comprising: a feeding device that stops the knock pin at a position where it can take the first position; and a means for slightly moving the positioned object until the knock pin in the first position contacts the straight generatrix; positioning device