JPS5925543A - Reciprocator - Google Patents

Abstract

PURPOSE:To detect the direction and quantity of a screw shaft moved in a high resolution by setting up a member to be detected, to which a large number of slits are formed at regular pitches, to an outer circumferential surface in a rotor while mounting a photodetector consisting of a light-receiving element and a light-emitting element at every one third pitch. CONSTITUTION:A disk 8 in which a large number of the slits 8a through which beams irradiated from the photodetectors 9-11 are passed are formed at every pitch 3l1 of treble as large as the fitting pitches l1 of the photodetectors 9-11 is fixed at the shaft end of the rotor 1 of a motor. The electric signals of the photodetectors 9-11 are converted into digital signals by an amplifying circuit and a conversion circuit. A control circuit arithmetically operates the direction and quantity of the screw shaft, which is screwed to the rotor, moved on the basis of these digital signals, and outputs moving-direction indicating signals and moving-quantity indicating signals.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a reciprocating device that converts the rotation of a rotor into a predetermined reciprocating motion.

Prior Art Conventionally, in the above-mentioned type of reciprocating device, a guide hole is provided through the rotor axis of a reversible motor, a screw shaft is installed in the guide hole so as to be reciprocally movable, and the screw is fed according to the rotation of the rotor. The action causes the screw shaft to reciprocate, and
ii A disk part that rotates together with the rotor and has a large number of slits formed at equal pitches around the periphery, and a photodetector consisting of a light source and two light emitting elements are attached via the slit part, and the rotor is rotated. The displacement of the screw shaft is detected based on the detection signal from the light receiving element having a phase difference of 90° according to the rotation of the light receiving element. In addition, in order to detect the displacement of the screw shaft with high resolution, it is necessary to form many slits in the disk part, which requires advanced slit processing technology. It had the disadvantage of

Furthermore, in a configuration in which a large number of magnetic bodies are formed at equal pitches on the disk part and a magnetic detector such as a Hall element that outputs a detection signal in response to the approach of the magnetic bodies is provided, the phase difference It was impossible to distribute the magnetic flux so as to obtain detection number 15 with a deviation of 90'', and there were gaps and gradients that made it impossible to detect the direction of movement of the screw shaft.

OBJECTS OF THE INVENTION In view of the above-mentioned shortcomings, an object of the present invention is to provide a simple structure capable of reciprocating the screw shaft according to the rotation of the rotor, and detecting the direction of movement and the amount of movement of the screw shaft with high resolution. An object of the present invention is to provide a reciprocating device equipped with a white light detection device.

Composition of the invention Hereinafter, the present invention will be explained according to examples.

FIG. 1 is a cross-sectional view schematically showing the reciprocating device according to the present invention, FIG. 2 is an explanatory view showing the detector extraction shape yR, and FIG. The rotor 1 has a hollow portion 2 formed at its axis, and a female thread 3 provided in the hollow portion 2.

It is rotatably supported by a motor case sink 4.

Screw III! l15 is pivotally supported within the motor casing 4, and has a single female thread 6 formed on the outer periphery, and has m
It is fitted with a 1m screw 3 formed in the hollow part 2 marked J.

The stator 7 is a motor case corresponding to the outer circumference of the rotor 1 marked mJ.
It is installed in the sink 5 and is formed from a stator core 7a and an identifier winding 7b that excites the identifier core 7a.

The disk 8 is fixed to one IM end of the rotor 1, and is surrounded by a number of slits 8a through which light emitted from photodetectors 9 to 11 (described later) passes, or has a pitch Q1 that is three times the mounting pitch of the photodetectors 9 to 11. It is formed every pitch 3 drive 1 consisting of.

Each of the photodetectors 9 to 11 includes a light emitting element 93 to 11, such as a light emitting tie, which irradiates light through the disk 8 to a position corresponding to the slit 8a, and Fluorescent elements 9b to llb such as photodiodes and phototransistors that output electrical signals 51 to KS3 based on the amount of irradiated light are mounted at predetermined pitches Ql.

The photodetectors 9 to 11 are arranged in advance and positioned on one chip board.

The amplifier circuits 12 to 14 are l1iJ light receiving elements 9b to 11b.
The electrical signals KSI-KS3 input from
It is one width wider than this.

The conversion circuits 15 to 17 convert the amplified electrical signals KS1 to KS
3 is converted into detection signals SSI to SS3 consisting of digital signals based on a predetermined reference voltage Vref.

Based on the detected signals SS1 to SS3, the control circuit 18 sets flags corresponding to the detected signals SS1 to SS3, and changes the rotational force direction of the rotor l based on the state of the set flag. , that is, the direction of the moving force of the screw shaft 4 is added to G (I), and the moving direction instruction (g No.
~ Based on the SSa number, the amount of movement of the screw shaft 4 corresponding to the amount of rotation of the rotor 1 is calculated, and the amount of movement instruction signal B is output.

The operation of this embodiment will now be explained with reference to Fig. fA4 and Fig. 5.

When power is supplied to the stator winding 7b, the stator 7 is energized, and as the rotor 1 rotates, the screw i1i+h 4
moves in the axial direction.

When the rotor 1 is rotated in the clockwise direction CW and the slits 8a are positioned in the order of photodetector 9 -> photodetector 10 -> photodetector 11 for each of the photodetectors 9 to 11, each light receiving Electric signals KS1 to KS3 are output from element gb-11b at time T corresponding to a predetermined pitch 111.

The control circuit 18 is connected to each electric
．． Based on the detection signals SS1 to SS3, the flags corresponding to the detection signals SS1 to S53 are set to Ill' primary level, and the transition state of the flags is set to 3, i.e., one flag corresponding to the detection signal SS1 is set. After that, if the flag corresponding to the detection signal SS2 is set, it is determined that the rotation direction of the rotor 1 is clockwise CW, and the screw shaft 4 corresponding to the clockwise direction CW is set.
A moving direction instruction signal A regarding the direction of moving force is output.

Further, the control circuit 18 receives detection signals SS1-SSa of the electrical signals KSI-KS3 output from the respective photodetectors 9-11.
The amount of rotation of the rotor 1 corresponding to the number is J, and the amount of movement of the screw shaft 4 in ml is subjected to f4 calculation processing, and a movement amount instruction signal B is output.

In contrast to the above, when the rotor 1 is rotated counterclockwise CCW, the detection signals SS1 to SS3 are manually inputted to the IR of the detection signal SS1 → detection signal SS3 → extraction signal SS2.
The control circuit 18 uses the transition states of the flags corresponding to the manually input detection signals SS1 to SS553 to read the fortune telling! 1. Then, the moving direction of the screw shaft 4 with respect to the rotational force direction of the rotor 1 is determined, and the moving direction instruction No. 1g A is issued. Similarly to the above, the amount of movement of the screw shaft 4 is determined by f4 based on the amount of rotation of the rotor 1 corresponding to the number of detection signals SS1 to SS3.
The calculation process is performed and a movement amount instruction signal B is output.

Therefore, in this embodiment, the moving direction of the screw shaft 4 is determined based on the transition state of the flag corresponding to each of the photodetectors 9 to 11, and the direction of movement of the screw shaft 4 is determined based on the number of manually inputted detection signals SS1 to S53. Since the amount of movement can be detected, the configuration can be simplified compared to a conventional reciprocating device that detects the direction of movement based on the phase deviation state. In addition, although the movement i1 can be detected with the same resolution as the conventional one, the number of slits is 17.
Since it can be reduced to 3, the slitting process can be simplified.

In the second invention, a large number of magnetic materials are attached to the disk at predetermined pitches, or a large number of teeth are formed on the outer periphery of the disk made of magnetic material at predetermined pitches, and 17 of the predetermined pitches are formed.
This is a reciprocating device equipped with a magnetic detection type detection device in which a magnetic detector such as a Hall element is installed every three pitches, and the other configuration is the same as the first invention, so a detailed description thereof will be omitted. do.

As described in detail, the first invention includes a stator provided in a motor casing sink, a stator rotatably supported in the motor casing sink, and a hollow portion extending through the shaft center. A rotor formed with a threaded body, a screw shaft fitted to the internal thread of 011, and a 4-rotor rotor marked . detection member and ff
Corresponding to the 1J slit position, 173 of the 01J pitch
At least three photodetectors each consisting of a light-receiving element and a light-emitting element are arranged for each pinch, and a screw shaft corresponds to the rotation of the rotor based on the input transition state of the detection signal output from the photodetector. What is the direction of the moving force? The second invention also includes a control circuit that calculates the amount of movement of the screw shaft corresponding to the amount of rotation of the rotor based on the number of manually detected detections. a stator, a rotor that is rotatably supported within the motor cane and has a female thread formed on its inner circumferential surface extending through the shaft center; a screw shaft that is engaged with the female thread described in ff1J; a member to be detected which is attached to a four-trochanter and has a large number of magnetic bodies arranged at equal pitches around the periphery;
At least three magnetic detectors are arranged at every 1/3 pitch of the mI pitch and emit detection signals using adjacent magnetic bodies as the rotor rotates, and the detection output from the nii magnetic detectors. The direction of movement of the screw shaft corresponding to the rotation of the rotor is determined based on the transition state of the signal, and the amount of movement of the screw shaft corresponding to the amount of rotation of the rotor is determined based on the input detection number. A reciprocating motion that is capable of reciprocating the screw shaft according to the rotation of the rotor using a simple configuration that includes a control circuit that performs arithmetic processing, and is also equipped with a detection device that can detect the direction and amount of movement with high resolution. It is a device.

[Brief explanation of the drawing]

FIG. 1 is a sectional view schematically showing a reciprocating device according to the present invention, FIG. 2 is an explanatory view showing a state in which the detector is taken out, FIG. 3 is an electrical block diagram of the detection device, FIG. FIG. 5 is an explanatory diagram showing the input transition state fg of the detection signal. Patent applicant Star Seiki Co., Ltd. Agent Patent attorney Italy IT! Ken -Figure 1 240- Figure 2 Pu 1

Claims (1)

[Scope of Claims] 1. A stator provided in a motor casing, rotatably supported in a motor casing sink, and a ridge formed on the inner circumferential surface of a hollow portion extending through the shaft center. a rotor consisting of a rotor, a screw shaft screwed into a female screw described in nII, 1111
A detected member is attached to the rotor and has a large number of slits formed at equal pitches on its outer circumferential surface, and a light-receiving element corresponding to the slits arranged at every 1/3 pitch of the ni7 pitch. At least three photodetectors consisting of light-emitting elements, and the detection output from the photodetectors in No. 111 (the direction of movement of the screw shaft corresponding to the rotation of the rotor are determined based on the input transition pattern of No. 8). A reciprocating device comprising a control circuit that performs judgment and arithmetic processing of the amount of movement of the screw shaft corresponding to the amount of rotation of the rotor based on the detected number of detections. 2. A reciprocating device provided in the motor case sink. a stator, a rotor that is rotatably supported within the motor casing and has a female thread formed on the inner circumferential surface extending through the shaft center; a screw Φ111 that is screwed into the +itr ml screw; 011 A detected member attached to the rotor and having a large number of magnetic bodies arranged at equal pitches around the circumference;
At least three magnetic detectors that output detection signals by the external body (G) that are inadvertently close to the rotation of the rotor, and an input 5 of the detection signal output from the 1111 magnetic detector.
Control that determines the direction of movement of the screw shaft corresponding to the rotation of the rotor based on the B state, and calculates the amount of movement of the screw shaft relative to the amount of rotation of the rotor based on the six-pointed detector. A reciprocating JA device with high circuitry.