JPS63235213A - Index table - Google Patents

Abstract

PURPOSE:To make the constitution simple in a manner and small in size as well as to facilitate easy maintenance and adjustment thereof by meshing a ring gear rotating together with a turn-table with a spur gear, and by stopping a motor at every one turn of the spur gear so as to detect thereby the rotating angle of a rotating shaft. CONSTITUTION:A turn-table 1 is rotated by a motor 6 via No.1 spur gear 5 and a ring gear 4. Simultaneously No.2 spur gear 8 is rotated at a predetermined gear ratio with the ring gear 4. Then a dock section 10 is rotated while being synchronized with the spur gear 8, thereby actuating a limit switch 11. Therefore, after the motor 6 is stopped at every one turn of the spur gear 8, it is restarted. And the rotating angle of a rotating shaft 7 at the time of motor stop is detected by a rotary switch 12. In this constitution, the replacement with the other spur gear having the different number of gear teeth enables a stop point to be changed with the reduction of parts in number, thereby enabling a small size thereof to be employed with the reduction in weight as well as facilitating each maintenance and adjustment thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an index table that accurately rotates a turntable and stops it at a desired position.

(Prior art) Index tables are generally used when testing and sampling solutions, etc., and rotate and move samples placed on a turntable to accurately position them at predetermined positions. It is something that makes it stop. A conventional example of such an index table is one using a gear drive system as shown in FIG.

That is, this device includes a motor (6) that generates rotational force;
The first spur gear (5) is connected to the upper end of the rotating shaft of the motor (6) and has a ring shape, and the teeth formed on the inner surface of the first spur gear (5) mesh with the first spur gear (5). A ring gear (4) that rotates in accordance with a numerical ratio, a rotating shaft (7) connected to the center of the ring gear (4), and a turn that is connected to the upper end of this rotating shaft and rotates in synchronization with the ring gear (4). A table (1), a dock (10) in the shape of a single bar connected to a predetermined location on the lower surface of the ring gear (4), and a position where the dock (10) is pressed and turned on every time it rotates. The rotation of the motor (6) is 0N10F.
It is composed of a limit switch (11) that performs F control, and a case (3) that holds the ring gear (4) via a bearing (2) and houses each of the above parts.

The conventional device configured in this way transmits the rotational force generated by the motor (6) to the ring gear (4) via the first spur gear (5).
) to rotate the turntable (1), which is connected to the ring gear (4) and the rotating shaft (7), at a desired rotation speed. Also, the dock (10) connected to the ring gear (4)
) rotates synchronously, and when the dock (10) presses the limit switch (11), the limit switch (11) outputs an OFF command to the control circuit of the motor (6), turning the motor (6) on. The turntable (1) is stopped at a desired position.

In addition to the above-mentioned gear drive system, there is also a Geneva drive system using a Geneva as shown in FIG. 3, which allows the turntable to have an indexing function.

(Problems to be solved by the invention) In the gear drive system, the stop position of the turntable is determined by the installation position of the limit switch, so it is difficult to change or adjust the stop position, and it is difficult to precisely position the turntable by the number of stop points. A limit switch is required,
Multi-point stop tables have problems such as difficulty in arranging and maintaining limit switches.

In the Geneva drive system, since the Geneva must be provided, the Geneva occupies a large space and weight.
Since only a portion of the Geneva driver is used to rotate the Geneva, there are problems such as poor drive efficiency and speed changes that occur while the Geneva is rotating.

The present invention was made in order to solve the above-mentioned problems, and its purpose is to make it possible to determine and change the stop interval and to be able to grasp individual index positions. do.

[Structure of the Invention] (Means for Solving the Problem) The present invention provides a gear drive system in which a ring gear is meshed with a spur gear having a smaller number of teeth than the ring gear, and when the ring gear rotates by a desired angle, the spur gear When the spur gear rotates once, it is detected that the motor is stopped, and the spur gear can be replaced with one with a different number of teeth. In general, a rotary switch was installed on the rotating shaft to detect the rotation angle of the rotating shaft.

(Operation) The rotation of the motor is transmitted to the ring gear, and when the ring gear rotates, the spur gear also rotates. One rotation of the spur gear is detected by means for detecting one rotation, and the motor is stopped only for a desired period of time. This spur gear can be converted as needed, so even if the stopping points are changed, the stopping points can be changed as long as the stopping points are equally spaced. Further, the stop position at the time of stopping can be determined by a rotary switch attached to the rotating shaft.

(Example) An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a diagram for explaining the configuration of an embodiment of the present invention, and the same components as those of the conventional device shown in FIG. In Figure 1, the motor (6
) is transmitted to the ring gear (4) via the first spur gear (5).
) and a rotating shaft (7) connected to its center.
Rotate.

A turntable (1) is connected to the upper end of the rotating shaft (7), and a rotary switch (12) is provided at the lower end.

A second spur gear (8) having the number of teeth necessary to stop the turntable (1) at a desired rotation angle is meshed with the ring gear (4), and the ring gear (4) rotates by the desired angle. The second spur gear (8) is provided so that it rotates once every time. A dock portion (10) is connected to the second spur gear (8) via a dock rotating shaft (9) connected to the center thereof. This dock portion (10) has a flat disk shape and has a convex portion formed on a part of its outer periphery. Limit switch (11
) is placed close to the dock part (10>), and the dock part (
10) is configured so that as it rotates, it is pressed by the convex portion and the switch is turned on. Dock part (1
0) and the second spur gear (8) is rotated but supported by a bearing (not shown) so that the position does not change.The bearing is shown together with the limits 1 to 11 (11). If not installed, it is fixed to the stand. This installation can be adjusted by a guide provided so that the stand can move in a radial direction parallel to the ring gear (4) from the rotation axis (7). When replacing the second spur gear, the diameter of the second spur gear changes because it has a different number of teeth. For this reason, the ring gear (4) must be installed by moving the entire stand.
The mounting is done by fixing the base so that the meshing of the second spur gear (8) and the second spur gear (8) is optimal. Limit switch (11) is O
When N is reached, a control circuit (not shown) receives the output and stops the motor (6) for a predetermined period of time, and then restarts the motor (6).

Further, a rotary switch (12) provided at the lower end of the rotating shaft (7) is connected to a large number of fixed contacts provided in a circular shape around the rotating shaft (7), and to the rotating shaft (7). It consists of a movable contact that slides on the fixed contact in synchronization with the rotation of the rotating shaft (7), and depending on where on the fixed contact the movable contact contacts, the rotating shaft (7) This makes it possible to check whether the angle is the same.

Next, the operation of this embodiment configured as described above will be explained. When the motor (6) starts and generates rotational force, the ring gear (4) and turntable (1) rotate in synchronization.
At the same time, the second spur gear (8) also rotates at a rotation speed determined in advance by the gear ratio with the ring gear (4). When the limit switch (11) is pressed by the dock part (10) which is connected to the second spur gear (8) via the dock rotation shaft (9) and rotates synchronously, this signal is not shown. input to the control circuit. The control circuit that receives this signal stops the motor (6) for a predetermined period of time and then restarts it. The angle of the rotation axis when stopped is determined by the rotary switch (12
) can be detected by the output.

As explained above, in this embodiment, the dock part (1
0) and one limit switch (11) can be used to stop the turntable (1) at every predetermined rotation angle, and the rotary switch (12) can be used to know at which rotation angle it is stopped. can. Since the second spur gear (8) can be replaced with a spur gear having a different number of teeth at the same time, the stopping point can be changed. In this way, since the number of parts is smaller than that of the gear drive system or the Geneva drive system, it is lightweight and maintenance and adjustment work can be facilitated.

[Effects of the invention] Compared to the conventional system in which a limit switch is provided for each stopping point, the indexing mechanism can be made smaller with fewer parts, and a spur gear can be used when changing the stopping point of the turntable. It can be changed by converting it to something that becomes the stop interval. Therefore, maintenance and adjustment work can be made easier.

[Brief explanation of the drawing]

FIG. 1 is a simplified diagram for explaining the configuration of an embodiment of the present invention, FIG. 2 is a diagram for explaining a gear drive system as a conventional example of the present invention, and FIG. 3 is a conventional example of the present invention. FIG. 3 is a diagram illustrating a Geneva drive system. 1...Turntable 2...Bearing 3...Case 4...Ring gear 5... ......First spur gear 6...Motor 7...Rotating shaft 8...Second spur gear 9 ......Dock rotation axis 10...Dock 11...Limit switch 12...Rotary switch 13...Geneva

Claims (1)

[Claims] (1) A motor that generates rotational force, a spur gear rotated by the motor, a ring gear that has teeth on its inner surface and rotates in mesh with the spur gear, and a ring gear that passes through the center of the ring gear. In a device in which a rotating shaft is provided, a turntable is joined to the rotating shaft so as to pass through the center, and the turntable is rotated by the rotational force of a motor, the ring gear has fewer teeth than the number of teeth of the ring gear. a spur gear to be matched, a means for detecting that the spur gear has rotated once, a means for stopping the motor when detected by the means, and a rotation angle detector connected to the rotating shaft and detecting the rotation angle of the rotating shaft. An index table comprising: means.