JPS6176255A - Positioning device for index table - Google Patents

Abstract

PURPOSE:To dispense with a table's up-and-down motion as well as aim at reduction in power and operating time, by installing a pressing member, which fits and presses an engaging member in space between both movable and fixed guide parts in time of going down, in the upper part of a position indexing plate jutting out to the middle of a table rotary shaft. CONSTITUTION:When a disc cam 26 is rotated in an H direction with rotation of a driving shaft 38, a cam roller 34 enters inside a notch part 35 of a Geneva plate 33 as being rotated in the same direction. And, a cam 26 turns one-third, making the plate rotate one-sixth in an I direction, whereby a position indexing plate 13 also rotates one-sixth, making an index table move to the next position. With rotation of an actuating arm 30 in an M direction due to rotation of the cam 26, a pressing member 18 moves in an N direction whereby an incline of a movable cam part 24 slides down on an incline of a fixed cam part 25, and at the point where a cam crest hits, the member 18 goes down in a P direction against a spring. Here, an engaging member 15 also goes down together with the member 18 and pressingly fitted in space between both movable side and fixed side guide parts, thus the position of a table 11 can be indexed and set with rotation alone.

Description

DETAILED DESCRIPTION OF THE INVENTION B) Industrial Application Field The present invention relates to a positioning device for an index table that determines the processing position of a workpiece in a machine tool that performs cutting, cutting, grinding, etc. of the workpiece. This invention relates to an index table positioning device that can reduce the power of the indexing stop and shorten the operating time.

(Conventional technology) As shown in Fig. 7, a conventional index table positioning device has a rotary shaft 2 fitted in the center of a machine frame 1, so that a circular index table 3 can be moved up and down and rotated. The peripheral edge of the lower surface of the index table 3 forms a crown-shaped first gear 4 for position indexing, and the peripheral edge of the upper surface of the machine frame 1 corresponding to the first gear 4 is provided. A crown-shaped second gear 5 for positioning was formed.

In Fig. 1g7, reference numeral 6 is a workpiece fixed at a predetermined position on the upper surface of the index table 3, and reference numeral 7 is a processing tool for the workpiece 6. In order to sequentially determine the machining position of the workpiece 6 using such index table positioning device, first, the index table 3 is raised as shown by arrow A, and at that position it is positioned as shown by arrow B. Rotate by an angle of
were engaged, and the next workpiece 6 was positioned at the processing tool T.

(C) Problems to be Solved by the Invention However, in the above-mentioned prior art, when the index table 3 is raised in the direction of arrow A, the plurality of workpieces 6 fixed to the top surface of the index table 3 are also removed. Therefore, the power required to raise the index table 3 becomes large, and the running cost also increases because a large temporary power output must be prepared at all times.

In addition, since the index tipple 3 moves up as shown by arrow A, rotates as shown by arrow B, and then descends as shown by arrow C, the operation time for positioning the workpiece 6 becomes longer. It was something. For this reason, the total time required for machining using a machine tool was long.

Furthermore, when the index table 3 is raised in the direction of the arrow, the processing tool 7 must be fully retreated in the direction of the arrow to avoid collision with the index table 3, and the amount of retreat must be large. Therefore, the space occupied by the entire machine tool is large.The present invention aims to solve these problems.

B.) Means for solving the problems and the above problems can be solved according to the present invention by including an index table rotatably mounted on the machine frame.1. In this index table positioning device that sequentially indexes the processing position of a workpiece fixed on the top surface of the index table by rotating it by a predetermined angle, a circular position indexing plate is protruded from the middle part of the rotation axis of the index table. At the same time, a positioning support plate is provided around the position indexing plate, a plurality of movable guide portions are formed on the outer circumference of the position indexing plate, and the movable guide portions are formed on the inner circumference of the positioning support plate. One or more fixed side guide portions are formed that face and match the portions, and between these guide portions, an upwardly opening (tapered space is formed and an engaging member is placed in this tapered space) is formed. The engaging member is interposed above the position indexing plate and moves up and down with the engaging member, and when descending, the engaging member is fitted and crimped between the two opposing guide parts to position the position indexing plate. The problem is solved by providing an index table positioning device characterized by disposing a crimping member for fixing the index table.

(e)) Function The index table positioning device according to the present invention has the following features:
As shown in FIG. 1, a position indexing plate 13 which is circular in plan view is protruded from the middle part of the rotating shaft 12 of an index table 110 rotatably provided on the machine frame 10, and the periphery of this position indexing plate 13 is A positioning support plate 14 is provided above the position indexing plate 13, and a support plate 14 is formed on the outer periphery of the position indexing plate 13 so that it moves up and down in the direction of arrows F and G along with an engaging member 15 and when descending. The movable side guide part 16 and the fixed side guide part 17 formed on the inner peripheral part of the positioning support plate 14
(See Fig. 2) The above-mentioned engaging member 15 is fitted and crimped between the opposing guide portions 16 and 17 (see Fig. 3). By disposing the crimping member 18, the index table 11 itself does not move up and down. The processing position of the workpiece fixed on the top surface of the index table 11 can be determined by simply rotating it by a predetermined angle without rotating the index table 11.

(F) Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 4 is a front sectional view showing an embodiment of the index table positioning device according to the present invention. At the center of the machine frame 10, an index table 110 rotation shaft 12 is rotatably supported by a bearing 19.
A circular index table 11 is fixed to the upper end of 2. This index table 11 has workpieces fixed on its upper surface at, for example, six equal positions on the circumference, and is rotated by a predetermined angle to sequentially determine the processing position of the workpiece.

Note that the index table 11 rotates on the upper surface of the ceiling section 20 of the machine frame 10, and a first sliding member 21a is provided on the outer periphery of the lower surface of the index table 11, and the upper surface of the ceiling section 20 A second sliding member 21b is provided at the corresponding location, and both sliding members 21a, 21b
Due to this sliding action, the index table 11 rotates smoothly and supports the load applied from above.

A position indexing plate 13 protrudes from an intermediate portion of the rotation shaft 12 of the index table 110. This position indexing plate 13 is used to determine the angular position when the index table 11 is rotated by a predetermined angle and fixed at that position, and is provided integrally with the rotation shaft 12 and has a circular shape in plan view. has been done. And this position index plate 1
As shown in FIG. 2, a plurality of movable side guide portions 16 are formed on the outer peripheral portion of the movable side guide portion 3 . This movable side guide part 16 is
When fixing the position of the index table 11, it guides the fitting and crimping of the engaging member 15, which will be described later. The bottom of the index table 110 has a groove shape with a taper opening upwardly, and the number of indexing positions of the index table 110 is divided into four equal parts, six equal parts, or an integral multiple thereof.

A positioning support plate 14 is provided around the position indexing plate 13.
is provided. This positioning support plate 14 fixes the position of the position indexing plate 13 after it has rotated by a predetermined angle. It is provided so as to be located within the same plane as the board 13.And,
As shown in FIG. 2, a fixed side guide portion 17 is formed on the inner peripheral portion of the positioning support plate 14. As shown in FIG. This fixed side guide portion 1γ is for guiding the fitting and crimping of the engaging member 15, which will be described later, when fixing the position of the position indexing plate 13.
As shown in FIG. 3, it is shaped like a groove with an opening edge that opens inward, and is set at one suitable location or at multiple locations such as bisecting or quartering ( It is formed.

The movable side guide part 16 and the fixed side guide part 1 are matched against each other.
7, as shown in FIG. 1, a tapered space that opens upward is formed and an engaging member 15 such as a steel ball is interposed therein. In FIG. 1, only the movable guide portion 16 is tapered, but on the contrary, only the fixed guide portion 17 may be tapered, or both guide portions 16 and 17 may be tapered. Each may be tapered to form a tapered space that opens upward. The engagement member 15 is
The guide parts 16 and 17 are fitted and crimped from above to fix the position of the position index plate 13 after rotation, and when the position index plate 13 rotates by a predetermined angle, the movable side guide part It is designed to protrude upward from 16. Note that the engaging member 15 is not limited to a steel ball, but may be a steel rod having a hemispherical lower end, for example.

A pressure bonding member 18 is provided above the position indexing plate 13. This pressure bonding member 18 is connected to the position indexing plate 1
3 has rotated a predetermined angle, the engaging member 15 is lowered into the space between the movable side guide part 16 and the fixed side guide part 1T, and is fitted and crimped. It is designed to be able to move up and down along the longitudinal direction of 12. That is, as shown in FIG. 4, a holding member 23 having a substantially U-shape in side view is provided on the outer peripheral edge of the crimping member 18 corresponding to the fixed side guide portion 17, and is fitted into the guide portion 17. The upper end of the holding member 23 is hooked to the upper surface edge of the pressure bonding member 18, and the lower end hook holds the engagement member 15, so that the holding member 23 moves up and down with the engagement member 15. In order to move the crimp member 18 up and down, as shown in FIG. A fixed cam portion 25 is formed whose slopes slide against the movable cam portion 24, and as the movable cam portion 24 reciprocates with respect to the fixed cam portion 25, the crimping member 18 is formed.
moves up and down. The operating mechanism of this pressure bonding member 18 includes, for example, a disc cam 26 and a cam roller 27, as shown in FIG.
, the actuation lever 28 , the link 29 , and the actuation arm 30
and a coil spring 31. In FIG. 4, reference numeral 32 is a return spring that always urges the pressure bonding member 18 upward, reference numeral 33 is a Geneva plate that rotates the position indexing plate 13 by a predetermined angle, and reference numeral 34 is the Geneva plate. This is a cam roller that engages with the notch 35 of j3.

Next, the operation of the grooved index table positioning device will be described.

First, the machining position of the index table 11 relative to the workpiece is determined from this, and the initial state is shown in FIG. Here, it is assumed that the movable side guide portions 16 are formed at six equal positions of the position indexing plate 13, and the positions of the six positions are determined. In this state, as shown in FIG. 5(a), the cam ridges of the movable cam portion 24 and the fixed cam portion 25 are not in contact with each other, and the crimping member 18 is pushed up by the return spring 32 shown in FIG. The engaging member 15 rises together with the pressure bonding member 18 and is separated above the movable guide part 16 along the fixed guide part 17. Therefore, the position indexing plate 13 can freely rotate. Therefore, in order to determine the processing position of the next workpiece, as shown in FIG. 4, the drive shaft 38 is rotated by a combination of a worm 36 and a form gear 370, for example. At this time,
In FIG. 6, the disc cam 2 is rotated by the drive shaft 38.
6 rotates in the direction of arrow H. Then, the disc cam 26
The cam roller 34 provided at a predetermined position is also indicated by the arrow H.
The disc cam 2B rotates by 1/3 due to the engagement with the notch 35. This causes the Geneva plate 33 to move in the direction of the arrow.
Rotate 6 times. As a result, the position indexing plate 13 rotates by 1/6 along with the Geneva grating 33 to move the index table 11 to the next processing position. At this time,
One or more of the movable guide portions 16 of the position indexing plate 13 and the fixed guide portion 17 face each other and match. During this time, the cam roller 27 provided at the base end of the operating lever 280
It just slides on the circumference of 6 and does not operate at all.

When the disc cam 26 has rotated v3 in the direction of the arrow H as described above, the cam starting end 39 of the disc cam 26 reaches the position of the cam roller 2T, and the disc cam 26 further rotates in the direction of the arrow H.
By rotating the cam roller 27 in the direction of arrow J
push in the direction. Then, the tip of the actuating lever 28 rotates in the direction of the arrow about the fulcrum 40, pushing out the slot 29 in the direction of the arrow. As a result, the operating arm 30 connected to the tip of the link 29 by the pin 41 is rotated in the direction of arrow M. This actuating arm 30 is shown in FIGS. 4 and 6.
As shown in the figure, it is connected to the crimping member 18, and when the actuating arm 30 rotates in the direction of arrow M, as shown in FIG.
As shown in the figure, the pressure bonding member 18 is moved in the direction of arrow N.

Then, the slope of the movable cam part 24 slides on the slope of the fixed cam part 25 and is gradually lowered, as shown in FIG. 5(b).
As shown in FIG.
When the cam ridges No. 4 come into contact with each other, the pressure bonding member 18 is moved down the most in the direction of arrow P against the return spring 32. At this time, as shown in FIGS. 1 and 4, the engaging member 15 is also lowered together with the crimp member 18, and one or more pairs of movable side guide portions 15 that have already been aligned oppositely by 1 m as described above are moved downward.
It fits from above into the tapered space formed between the fixed side guide portion 17 and the fixed side guide portion 17 and is crimped. By fitting and press-fitting the engaging member 15, the position indexing plate 13 is fixed in position by the positioning support plate 14, and as a result, the position of the index table 11 is indexed and determined. Furthermore, at this time,
The disc cam 26 is rotated almost one revolution, and the end 4 of the cam
2 has reached near the cam roller 27.

Next, in order to determine the processing position of the next workpiece, the disk cam 26 is rotated in the direction of arrow H from the above state, and immediately thereafter returns to the initial state shown in FIG. 6. At this time, since the pushing against the cam roller 27 is released, the actuating arm 30 is returned in the direction of the arrow Q by the biasing force of the coil spring 31. Then, Figure 5 (b
), the crimping member 18 is returned in the direction indicated by the broken line arrow, and the cam ridges of the movable cam portion 24 are removed from the cam ridges of the fixed cam portion 25, and the crimping member 18 is interposed on the lower surface side of the crimping member 18 shown in FIG. Both cam portions 2 are
4.25, the crimping member 18 slides upward in the direction of the arrow R, and as shown in FIG.
rise like. At this time, the engaging member 15 also rises together with the pressure bonding member 18, and is detached above the movable guide part 16 by the fixed guide part 17. This allows the position indexing plate 13 to rotate freely, making it possible to index the next position.

Although FIG. 6 shows the movable side guide portions 16 formed at six equal positions on the outer circumference of the position indexing plate 13, the present invention is not limited to this. The movable side guide portions may be equally divided or an integral multiple thereof. Further, regarding rotation of the index table 11 by a predetermined angle, although the Geneva method using the Geneva plate 33 has been shown, the invention is not limited to this, and for example, a rack and pinion method may be used.

(G) Effects of the Invention As explained above, the present invention provides an index table 1
10 A position indexing plate 13 is protruded from the middle part of the rotating shaft 12, and a positioning support plate 14 is provided around the position indexing plate 13, and an engaging member 15 is provided above the position indexing plate 13. As the index table 11 itself moves up and down, a crimping member 18 is provided that fits and presses the engaging member 15 between the opposing movable guide section 16 and the fixed guide section 17 when descending. The index table 11 can be positioned simply by rotating the crimp member 18 by a predetermined angle and lowering the crimp member 18 without moving it up or down. Therefore, it is not necessary to lift the index table together with a plurality of workpieces fixed to the washing surface as in the conventional case, and the power required to simply raise the crimping member 18 is sufficient, which greatly reduces the power required for operation. Can be made smaller. From this, the running cost of the device can also be reduced. Also, index table 1
1 by a predetermined angle and then lower the crimping member 18 toward the position indexing plate 13 (this can shorten the operation time for position indexing of the workpiece. In addition, since the index table 11 is not raised in any way, the upper surface of the index table 11 can be easily moved (unless it collides with a fixed workpiece). The overall space occupied can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a PFr side view showing the index table positioning device according to the present invention, FIG. 2 is a plan view showing the positioning plate and the positioning support plate, and FIG. 3 is a plan view showing the movable side guide part, the fixed side guide part, and the Fig. 1 is a sectional view taken along the line ■-■ in Fig. 1 showing the mating member, Fig. 4 is a sectional view showing a specific example, Fig. 5(a)
p ib) is an explanatory view showing the vertical movement of the pressure layer member, FIG. 6 is a plan view showing the groove formation above the pressure bonding member omitted,
Figure K7 is a sectional view showing a conventional index table positioning device. DESCRIPTION OF SYMBOLS 10... Machine frame, 11... Index table, 12... Rotating shaft, 13-... Position indexing plate, 14...
...Positioning support plate, 15...Engagement member, 16...-Movable side guide part, 17
- Fixed side guide part, 18... Crimping member, 23... Holding member, 24...
・Movable cam part, 25-fixed cam part, 26-・disc cam,
27.-Cam roller, 28... Operating V bar, 29
...Link, 30-F'li moving arm, 31-Coil spring, 32-Return spring.

Claims (1)

[Claims] In an index table positioning device that has an index table rotatably provided on a machine frame and sequentially determines the processing position of a workpiece fixed to the top surface of the index table by rotating it by a predetermined angle, A circular position indexing plate is protruded from the middle of the rotating shaft, a positioning support plate is provided around the position indexing plate, and a plurality of movable guide portions are formed on the outer periphery of the position indexing plate. , one or more fixed side guide parts are formed on the inner peripheral part of the positioning support plate so as to be able to face and match with the movable side guide part, and a tapered space that opens upward is formed between these guide parts. At the same time, an engaging member is interposed in this tapered space, and above the position indexing plate, the engaging member moves up and down with the engaging member, and when descending, the engaging member is placed between the two opposing guide parts. 1. A positioning device for an index table, comprising a crimping member that fixes the position of a position indexing plate by fitting and crimping.