JPH0521311Y2 - - Google Patents

Description

[Detailed description of the invention] a. Industrial application field The present invention relates to an index table device, and in particular, it performs highly accurate indexing using a simple positioning pin without using a Geneva gear mechanism or a parallel cam. Concerning new improvements to make this happen.

b. Prior Art Various configurations have been adopted and proposed for this type of index table device that has been used in the past, and a typical configuration is shown in Fig. 6. Mention may be made of a Geneva gear mechanism or a parallel cam mechanism (not shown).

In the case of the Geneva gear mechanism shown in FIG. 6, when the Geneva gear mechanism is divided into four parts, the Geneva gear 2 having four positioning grooves 1a, 1b, 1c and 1d is used as a base (not shown).
A table (not shown) is attached to the Geneva gear 2, and the engagement pin 4 of the rotating arm 3 is provided so as to be engageable with each of the positioning grooves 1a, 1b, 1c and 1d. There is.

Furthermore, each positioning groove 1 of the Geneva gear 2
An arc portion 5 is formed between each of a, 1b, 1c and 1d, and an outer peripheral edge 6a of the disc portion 6 of the rotating arm 3
It has a sliding structure.

Therefore, as the rotating arm 3 rotates, the engaging pin 4 moves into each positioning groove 1a, 1b,
1c and 1d, and in the configuration shown in FIG. 6, the Geneva gear 2 can be intermittently fed by 90 degrees, thereby allowing ) can be determined.

c. Problems to be solved by the invention Since the index table device according to the invention is configured as described above, it has the following problems.

(1) In the above-mentioned configuration using Geneva gears, the indexing operation itself is performed extremely accurately and reliably, but in order to increase the accuracy, extremely high-precision machining is required, which increases costs. , and its processing was not easy either.

Also, even in configurations using parallel cams,
The situation was similar to the configuration of the Geneva gear described above.

(2) Furthermore, the conventional configuration requires power for rotating the table (for example, an electric motor) and power for positioning the table (for example, a plunger, etc.), and is subject to restrictions from both cost and shape. Ta.

The present invention was made to solve the above problems, and in particular, it is an indexing device that uses simple positioning pins to perform highly accurate indexing without using a Geneva gear mechanism or parallel cam. The purpose of the present invention is to provide a storage device.

d. Means for Solving the Problems The index table device according to the present invention includes: a main shaft rotatably provided on a pair of bearings provided on a frame; a threaded portion formed to a required length on the main shaft; a first gear coaxially screwed into the threaded portion;
a spring provided between the frame and the first gear; a motor provided on the frame for driving the first gear; a table provided on one end of the main shaft; a positioning pin configured to be provided and configured to freely engage with a plurality of positioning holes of the table; and a lever rotatably supported on the frame and provided to engage with the first gear and the positioning pin. The configuration is equipped with the following features.

e Effect: In the index table device according to the present invention, when the first gear rotates due to the rotation of the motor, the first gear moves downward, and the positioning pin is lifted upward as the lever rotates. The engagement relationship between the pin and the positioning hole of the table is released.

When the table and the positioning pin are disengaged, the spring between the first gear and the frame is sufficiently compressed, so the reaction force of this spring causes the table to move toward the drive gear provided on the motor. The first gear rotates faster than the first gear, and the first gear pivots in the opposite direction, that is, upward, by the difference between the rotation of the table and the rotation of the drive gear.

As the first gear moves upward, the locating pin acts in the direction of pressing the table, but in this case, the locating hole is away from the position of the locating pin, and the next locating hole corresponds to the position of the table. At the extended position, the positioning pin fits into this positioning hole, and the table is indexed.

f. Embodiments Hereinafter, preferred embodiments of the index table device according to the present invention will be described in detail with reference to the drawings.

1 to 5 are for showing the index table device according to the present invention. In the figures, the reference numeral 10 is a frame body having a substantially box shape as a whole. Plate 11 and lower plate 1
A pair of bearings 13 and 13a provided in
A main shaft 15 having a threaded portion 14 of a required length is rotatably provided. A first gear 18 having a threaded part 16 on its inner surface and a gear part 17 on its outer surface is screwed into this threaded part 14, and this first gear 18 is connected to a motor 19 provided on the frame 11.
When the first gear 18 is rotationally driven by the drive gear 21, the first gear 18 rotates the main shaft 1 only in the direction of the arrow P.
It is configured to rotate and move on 5.

A spring 22 is interposed between the first gear 18 and the lower plate 12 of the frame 10.
The gear 18 is always urged upward.

A table 24 having a plurality of positioning holes 23 is provided at the lower end of the main shaft 15 protruding from the frame 10.
are integrally provided, and these positioning holes 2
A positioning pin 26, which is provided in the frame 10 and can be freely inserted and removed by the intermediate plate 25 and the lower plate 12, is provided in one of the three. This positioning pin 26 is provided with a first flange 27 and a second flange 28 .
A restoring spring 29 is compressed and interposed between the intermediate plate 25 and the intermediate plate 25, and always urges the positioning pin 26 toward the positioning hole 23. The second flange 28 comes into contact with the lower plate 12 and functions as a stopper.

A lever 3 is located at an approximately intermediate position within the frame 10.
0 is provided rotatably in the direction of arrow A via a shaft support 31, one end 30a of which abuts the lower end of the first gear 18, and the other end 30b abuts the first flange 27. ing.

The index table device according to the present invention is constructed as described above, and its operation will be explained below.

When the drive gear 21 rotates via the speed reduction mechanism 20 due to the operation of the motor 19, the first
The gear 18 pivots downward while rotating, and the lever 3
0 rotates in the direction of arrow P.

At the same time, the other end 30b of the lever 30 rotates upward to move the positioning pin 26 upward via the first flange 27, so that the positioning pin 26 and the positioning hole 23 of the table 24 engage with each other. will be canceled.

When the table 24 and the positioning pin 26 are disengaged, the spring 22 between the first gear 18 and the lower plate 12 of the frame 10 is sufficiently compressed. Therefore, the table 24 rotates faster than the rotation of the drive gear 21, and the first gear 18 is axially moved in the opposite direction, that is, upward, by the difference between the rotation of the table 24 and the rotation of the drive gear 21.

As the first gear 18 moves upward, the positioning pin 26 acts in the direction of pressing the table 2424, but in this case, the positioning hole 23 is away from the position of the positioning pin 26, and the next positioning At the indexing position of the table 24 corresponding to the hole 23, the positioning pin 26 is fitted into the positioning hole 23, and the table 24 is indexed. The above operation sequence is as shown in FIG.

Although the number of the positioning holes 23 described above is four in this embodiment, it can be set to any number depending on the indexing angle.

g. Effects of the invention Since the index table device according to the invention is configured as described above, the following effects can be obtained.

(1) Since it is composed of motors, gears, positioning pins, etc., without using Geneva gears as in the past, high-precision positioning can be achieved without high-precision machining.

(2) The table can be positioned by driving only one motor without using any other power or drive signals.

(3) Since the positioning pin is fitted into the positioning hole of the table, positioning accuracy can be maintained extremely high.

Furthermore, even if the locating pin stops the table at a predetermined position, the first gear can threadably move on the main shaft and the lever can disengage the locating pin from the table. Equipped with a heavy overload prevention mechanism,
The motor and reducer can be reliably protected from overload.

(4) Since everything except the motor is composed of only mechanical parts, failures are less likely to occur, and high precision and reliability can be achieved at low cost.

[Brief explanation of drawings]

1 to 5 show an index table device according to the present invention, in which FIG. 1 is a cross-sectional view showing the overall configuration, FIG. 2 is a cross-sectional view showing the main parts of FIG. 1, and FIG. 1 is a bottom view, FIG. 4 is a sectional view taken along the line B--B in FIG. 1, FIG. 5 is a chart showing an operation sequence, and FIG. 6 is a plan view showing a conventional configuration. 10 is a frame body, 13 and 13a are bearings, 14 is a screw portion, 15 is a main shaft, 18 is a first gear, 19 is a motor, 22 is a spring, 24 is a table, 26 is a positioning pin, 29 is a restoring spring, 30 is a lever.

Claims (1)

[Scope of claims for utility model registration] (1) A pair of bearings 13, 13 provided in the frame 10
a main shaft 15 rotatably provided on the main shaft 15, a threaded portion 14 formed to a required length on the main shaft 15, and a first gear 18 coaxially screwed into the threaded portion 14.
a spring 22 provided between the frame 10 and the first gear 18; a motor 19 provided on the frame 10 for driving the first gear 18; and a motor 19 provided on one end of the main shaft 15. a table 24 , a positioning pin 26 provided in the frame 10 and configured to be able to freely engage with a plurality of positioning holes 23 of the table 24 , and a
A lever 30 is rotatably supported on the shaft and engaged with the first gear 18 and the positioning pin 26, and the first gear 18 moves on the main shaft 15 by the operation of the motor 19. The index device is characterized in that the engagement between the positioning pin 26 and the positioning hole 23 is released via the lever 30, and the table 24 is rotated by the reaction force of the spring 22. Tsuxtable device. (2) The positioning pin 26 is connected to the restoring spring 2
9. The index table device according to claim 1, wherein the index table device is always biased toward the table 24 by the index table 9. (3) The positioning pin 26 and table 24 are
3. The index table device according to claim 1, wherein the index table device is driven by one motor 19 for rotating the first gear 18.