JPH02175030A - Device for returning to origin in driving device for rotor - Google Patents

Abstract

PURPOSE:To make a structure simple, to reduce trouble and to secure operation by controlling the return to origin based on the zero phase pulse given from an encoder. CONSTITUTION:When a main switch is made on, an initialization such as read of a control program from the ROM to the CPU is performed, then, a subroutine for returning to origin is called. A servo motor 22 is driven to rotate turrets 12, 13 and while a zero phase pulse is generated from an encoder 24, the turrets 12, 13 are rotated at a fixed speed. When the zero pulse is generated, the turrets 12, 13 continue the processing till the time when their rotation angles are equivalent to the prescribed angles and reduce the rotation and stop it at the prescribed time. The stoppage position is equivalent to the position to which the turrets rotate 360 deg. from the generating position of zero phase pulse. The next zero phase pulse is generated at the stoppage time, the turrets 12, 13 stop at the generating position of the zero phase pulse of the encoder 24 and the return to origin is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an origin return device, and particularly to an origin return device in a rotary drive device for rotating a rotating body.

[Prior Art] In a conventional rotating body drive device, for example, a turret drive device for a plate processing machine, the origin return device for returning the turret to its origin includes a servo motor that rotationally drives the turret, and a servo motor that detects the rotational position of the turret. The turret is equipped with an encoder for returning the turret to its origin, and a cam and limit switch used when the turret returns to its origin.

This origin return device is controlled as shown in FIG.

First, at time tl, the servo motor starts and (a
) The turret will start as shown.

0 time t2 when the cam also rotates according to the rotation of this turret
, the limit switch is turned on as shown in (b).
The turret will then slow down accordingly. Then, while the turret is rotating at a constant low speed, if a zero-phase pulse is generated in the encoder at time t as shown in (C), the servo motor will stop. As a result, the turret stops at the position where the zero-phase pulse of the encoder is generated, that is, the origin.

[Problem to be solved by the invention]

The conventional configuration requires a cam that rotates together with the turret and a limit switch that engages with the cam. That is, in the conventional configuration, since the return-to-origin operation is started by using a member that performs such a mechanical operation, problems arise such as failures and errors due to wear. Furthermore, this configuration inevitably results in a complicated structure.

SUMMARY OF THE INVENTION An object of the present invention is to provide a home return device that has a simple structure, is less prone to failure, and can perform accurate home return.

[Means to solve the problem]

The origin return device according to the present invention is a device for returning a rotating body to its origin in a rotating body driving device for rotating a rotating body. This device includes a drive means, an encoder, and a control means.

The driving means is connected to the rotating body and is a means for rotationally driving the rotating body. The encoder is connected to a rotating body and emits a zero-phase pulse every time the rotating body rotates once. The control means is a means for controlling the driving means to rotate the rotary body, and to stop the rotary body in accordance with the generation of the next zero-phase pulse, using the zero-phase pulse received from the encoder as a reference.

[Effect]

In the origin return device according to the present invention, the drive means rotates the rotating body under control by the control means. When a zero-phase pulse is generated from the encoder as the rotary body rotates, the control means uses the zero-phase pulse as a reference and controls the drive means to stop the rotary body in time with the generation of the next zero-phase pulse. As a result, the rotating body stops at the zero-phase pulse generation position of the encoder, and the return of the rotating body to the origin is completed.

In this case, since the home return operation is performed based on the zero-phase pulse, a cam or a limit switch is not required, resulting in fewer failures and more accurate operation.

〔Example〕

FIG. 2 shows a punch press machine employing an embodiment of the present invention. As shown in FIG. 2, the punch press machine 1 mainly consists of a lower frame 2, an upper frame 3 disposed above the lower frame 2, and a throat section 4 that supports these at the rear. There is. lower frame 2
A fixed table 10 is arranged at the center of the upper surface.

A pair of guide rails 5 and 6 are arranged on the upper surface of the lower frame 2 on both sides of the fixed table 10. A carriage 7 extending in the left-right direction (X-axis direction) is provided on the guide rail 5.6 so as to be movable in the depth direction (Y-axis direction). On both sides of the fixed table 10, there is a pair of movable tables 8. fixed to the carriage 7.
9 is placed. Further, the carriage 7 is provided with a cross slide (not shown) on which a work holder for gripping and holding the work 11 is mounted so as to be movable in the X-axis direction.

The upper frame 3 is rotatably provided with a generally disc-shaped upper turret 12 on which a plurality of punches are mounted. Further, below the upper turret 12, a lower turret 13 which is concentric with the upper turret 12 and has a generally disk shape is arranged on the lower frame 2. A large number of dies corresponding to the punches provided on the upper turret 12 are fixed to the lower turret 13.

A control panel 30 is arranged on the side surface of the throat portion 4. The control panel 30 includes a keyboard 31 for the operator to input keys manually, and a C for display.
An RT 32, a tape reader 33 for inputting a Canadian program, and the like are provided.

The structure of the lower turret 13 is schematically shown in FIG.
In the figure, the central axis 20 of the lower turret 13 extends downward. A servo motor 22 is connected to a vertically central portion of the central shaft 20 via a pair of gears 21 . In addition, a pair of gears 2 having the same number of teeth are provided at the lower end of the central shaft 20.
An encoder 24 is connected via 3. Note that the upper turret 12 is also provided with a drive control mechanism similar to that of the lower turret 13. However, the upper turret 12 has a configuration in which the configuration shown in FIG. 1 is upside down.

The control unit 40 of the punch press machine l shown in FIG.
It is equipped with a microcomputer consisting of SROM, RAM, etc. The control unit 40 includes a keyboard 31,
A tape reader 33, encoder 24, and other input sections are connected. Further, the control section 40 is connected to the servo motor 22 and other output sections. This control section 40
The punch press machine 1 is controlled as described below.

Next, the operation of the above embodiment will be explained according to the control flowcharts shown in FIGS. 4A and 4B.

In FIG. 4A, when a main switch (not shown) is turned on, initial settings such as reading a control program from the ROM to the CPU are performed in step S1. Next, in step S2, a subroutine for returning to the origin is called.

As shown in FIG. 4B, in step S3 of the origin return subroutine, the servo motor 22 is driven and the turret 12.13 starts rotating. This point corresponds to time too in FIG. Next, in step S4, the rotation of the turret 12.13 is accelerated. When the turret 12.13 reaches the predetermined speed, the process moves to step S5 and the turret 12.13 is rotated at a constant speed. Then, in step S6, the encoder 24
It is determined whether or not a zero-phase pulse is emitted. Until the zero-phase pulse is emitted from the encoder 24, the turrets 12, 13 are rotated at a constant speed in step S5. If a zero-phase pulse is emitted as shown in time points (a) and (a) in FIG. 5, the process moves to step S7.

In step S7, the turrets 12.13 are further rotated at a constant speed. Then, the time tI when the rotation angle of the turret 12.13 corresponds to 355° with respect to the zero-phase pulse generation time point! The process continues until . time t+z
If so, the process moves to step S8 and the turret 12.1
Decrease the rotation of 3. During this deceleration period, turret 12.
13.Then, in step S9, the turret 12.13 is stopped.The stopping position of the turret 12.13 is 360 degrees from the position where the zero-phase pulse detected in step S6 is generated. @ Corresponds to the rotated position. Therefore, at the stop time t'ff of the turret 12.13, the next zero-phase pulse will be emitted as shown in °C in FIG. 5. That is, step S9 When the process of 12.13 is completed, the turret 12.13 is stopped at the zero-phase pulse generation position of the encoder 24, and the return of the turret 12.13 to the origin is completed.

Next, the process moves to step SIO in FIG. 4A.

In step S10, a Canadian program is read from the keyboard 31 or tape reader 33.

Then, in step S11, input of a work start command is awaited. If the work start command key on the keyboard 31 is input, the process moves to step 312.

In step S12, the turret 12.
13, the carriage 7, etc., the plate material 11 is subjected to a predetermined processing according to the cannibal program read in step S10. When the processing in step S12 is completed, the program ends.

In this way, according to the above-mentioned embodiment, it is possible to perform a return-to-origin operation without using a cam or a limit switch, so there are fewer failures, accurate operation can be maintained, and the structure is simple. A home return device can be realized.

In the above-described embodiment, the present invention is applied to the turret of a punch press machine, but the present invention is not limited thereto, and can be applied to drive devices for rotating bodies in various fields. Furthermore, by connecting a rotating body to the reciprocating section, the present invention can be employed for returning the reciprocating section to its origin. Therefore, it is also possible to employ the present invention, for example, for returning the cross slide of a punch press machine to its origin.

〔Effect of the invention〕

In the present invention, since the home return control is performed using the zero-phase pulse received from the encoder as a reference, a cam or mitt switch is not required, and a home return device with less failure, accurate operation, and simple structure is obtained. You will be able to do this.

[Brief explanation of the drawing]

FIG. 1 is a perspective schematic diagram of an embodiment of the present invention, FIG. 2 is a perspective schematic diagram of a punch press machine employing an embodiment of the present invention, and FIG. 3 is a schematic block diagram of the control section thereof. 4A and 4B are control flowcharts thereof, FIG. 5 is a timing chart thereof, and FIG. 6 is a timing chart of a conventional example. 12.13...Turret, 22...Servo motor 24...Encoder, 40...Control unit. Patent applicant Representative of Murata Machinery Co., Ltd. Patent attorney Yukio Ono

Claims (1)

[Claims] (1) A rotating body driving device for rotating a rotating body, which includes: an origin return device for returning the rotating body to an origin, and a driving means connected to the rotating body and rotationally driving the rotating body; , an encoder connected to the rotating body and emitting a zero-phase pulse every time the rotating body makes one revolution; A control means for controlling the driving means to stop the rotating body in accordance with the occurrence of the occurrence of the occurrence of the rotation, in a rotating body driving device.