JPS60245870A - Actuator with built-in detector - Google Patents

Abstract

PURPOSE:To permit a detector to be easily built in a driven object, by arranging the detector, which detects the rotary speed of an output shaft in a worm reduction machine, in the casing of an actuator. CONSTITUTION:An actuator 1, consisting of a servomotor 2 and a worm reduction machine 3, provides a detector 11, which detects the rotary speed of an output shaft 9, in a casing 6 while supports a rotary disc 14 onto the output shaft 9, and the rotary disc 14 is provided so that its peripheral part is interposed between light emitting and receiving elements of each sensor 12, 13. In consequence, the actuator and/or the detector can be integrally and easily assembled in a driven object.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an actuator with a built-in detector that is used, for example, to move a piston of a variable venturi type vaporizer.

(Prior Art) When an actuator moves a driven object, a detector is sometimes provided to detect the moving position of the driven object, but conventionally, such a detector is separate from the actuator. It is provided.

(Problems to be Solved by the Invention) According to the above configuration, since the actuator and the detector are separate bodies, it is necessary to individually assemble them to the driven object, which is complicated.

(Object of the Invention) The present invention was made in view of the above-mentioned circumstances, and provides an actuator and a detector for detecting the operating state of the actuator that can be easily assembled to a driven object. , and in this case, the object is to facilitate control for detecting the operating state of the actuator.

(Structure of the Invention) A feature of the present invention for achieving the above object is that a detector for detecting the rotation speed of the output shaft of the worm reducer is provided, and this detector is installed inside the casing of the worm reducer. It is located at the point where it is placed.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show a first embodiment, l is an actuator, and this actuator l has a servo motor 2 and a worm reducer 3. In FIG.

The worm gear reducer 3 includes a worm gear 5 connected to the servo motor 2 and a casing 6 that covers the worm gear 5. The worm 7 of the worm gear 5 is connected to the rotating shaft of the servo motor 2, and the worm wheel 8 of the worm gear 5 is supported by an output shaft 9 supported by the casing 6. One end of this output shaft 9 projects outside from the casing 6, and this projecting portion serves as a connection portion to a driven object (not shown).

A detector 11 for detecting the rotating plate of the output shaft 9 is provided. The detector 11 is an incremental rotary encoder, and includes a first sensor 12 and a second sensor 13, each of which is a photo sensor, arranged in parallel in the circumferential direction of the output shaft 9. Each of these sensors 12 and 13 has a light emitting element and a light receiving element, and outputs a detection signal when light from the light emitting element is applied to the light receiving element. Further, the same detector 11 has a rotating disk 14 supported on the axis of the output shaft 9, and the outer periphery of the rotating disk 14 is interposed between the light emitting element and the light receiving element of each of the sensors 12 and 13. It is provided to do so.

Notches 16 of the same shape are formed at equal intervals in the circumferential direction on the outer periphery of the rotating disk 14, and each of the sensors 12
, 13, allowing light to pass through. Further, the outer periphery of the rotating disk 14 between the adjacent notches 16 is provided with a light shielding portion 17.
The light blocking portion 17 blocks light from passing through corresponding to each sensor 12, 13. Further, the circumferential dimensions of the cutout portion 16 and the light shielding portion 17 are the same.

Further, for example, as shown in FIG. 1, when one end of the light blocking portion 17 facing counterclockwise corresponds to the first sensor 12, one end of the notch 16 facing clockwise is configured to correspond to the second sensor 13. Ru.

FIG. 3 shows a time chart of both sensors 12 and 13 when the actuator 1 operates and the rotary disk 14 rotates with the above configuration.

That is, as shown in FIG.
)= When the rotating disk 14 rotates clockwise (in the direction of arrow A in the figure) from the state of (OFFLoN), from this state, first (first sensor 12/second sensor 13) = (
ONloN), then (first sensor 12/second sensor 13) = (ON10 F F), then (first sensor 12/second sensor 13) = (OFFloFF).
). This output state is then repeated.

On the other hand, from the state of (first sensor 12/second sensor 13) = (OFFLON) shown in Figure 1, the rotating disk 14
When rotating in the counterclockwise direction (direction of arrow B in the figure), the output states of the first sensor 12 and the second sensor 13 are the same as those of the rotating disk 1.
4 is rotated clockwise as described above, the output state is opposite.

Further, although not shown, output signals from the respective sensors 12 and 13 are input to a rotation direction detection circuit and a counter circuit, for example.

The rotation direction detection circuit 1 detects that the signal from the first sensor 12 is O.
2nd sensor 1 when turning from N to OFF (falling)
The rotational direction of the rotary disk 14 is detected in the output state No. 3, and the signal thereof is output to the counter circuit.

That is, if the output state of the second sensor 13 is OFF when the signal of the first sensor 12 falls, it is determined that the rotating disk 14 is rotating clockwise, and the counter circuit is instructed to perform, for example, counting and addition. Outputs a command signal. On the other hand, the first sensor 1
If the output state of the second sensor 13 is ON when the signal No. 2 falls, it is determined that the rotating disk 14 is rotating counterclockwise, and a command signal for counting and subtraction is output to the counter circuit. . Based on this count, the operating state of the rotating disk 14, that is, the operating state of the output shaft 9 is detected.

In the above case, the detector 11 may have a single 7' sensor, and the operating state of the output shaft 9 may be detected only by the detection signal from this sensor.

FIG. 4 shows another embodiment of the detector 11, in which the first sensor 1
2 and the second sensor 13 are arranged side by side in the radial direction of the rotating disk 14. Further, between the notch 16 and the light shielding part 17 of the embodiment, another light shielding part 17a is formed that turns off the first sensor 12, and another notch 16a that turns on the second sensor 13. is formed.

The operation of this configuration is almost the same as that of the previous embodiment.

5 and 6 show other embodiments of the arrangement of the servo motor 2 and the detector 11, in which the axial direction of the servo motor 2 and the arrangement direction of the output shaft 9 and the detector ti are parallel. There is.

The other configurations are the same as those of the previous embodiment.

According to the configuration of each of the embodiments described above, since the actuator 1 includes the servo motor 2, it is possible to obtain a larger torque than when the actuator 1 includes, for example, a step motor. Moreover, by providing the detector 11, this servo motor can have the same function as a step motor.

(Effects of the Invention) According to the present invention, a detector for detecting the rotation speed of the worm reducer is provided in the casing of the worm reducer, and the actuator has a built-in detector. can be integrally assembled to the driven object. Therefore, this assembly is easier than assembling the actuator and the detector individually.

Moreover, in this case, the detector is provided to detect the rotation speed of the output shaft of the worm gear reducer, and the output shaft of the worm gear is not operated by external force from the driven object side, so for example This avoids the inconvenience that occurs when the rotating disk unintentionally rotates due to external force after the power supply to the motor and detector is stopped, resulting in the detection contents of the detector not matching the actual operating state of the output shaft. be done. Therefore, the control for detecting the operating state of the actuator is facilitated.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, in which Fig. 1 is a cross-sectional view of the entire plane, Fig. 2 is a cross-sectional side view of the same, Fig. 3 is a time chart of the first sensor and second sensor, and Fig. 4 is a detection FIGS. 5 and 6 are partial plan views showing other embodiments of the vessel, and FIGS. 5 and 6 show still other embodiments of the present invention. FIG.
The figure is a side sectional view of the same. l...actuator, 2...servo motor (electric motor)
, 3. Worm reducer, 5. Worm gear, 6. Caving, 9. Output shaft, 11. Detector. Patent applicant: Yamaha Motor Co., Ltd. (Fig. 3 V) Samurai t-ya x-dai]・l/1
．． IIJ Fu() ~ Procedural Amendments Director General of the Patent Office 1. Indication of Weakness 1982 Patent Application No. 100047 2. Title of Invention Actuator with Built-in Detector 3. Relationship with the Amendment Person Case Address of Patent Applicant 2500 Shingai, Iwata City, Shizuoka Prefecture Name (AO7) Yamaha Motor Co., Ltd. 4,
Agent address: Shinmachi Building, 1-2-13 Shinmachi, Nishi-ku, Osaka @(
08) 541-5128 ■Name (8427) Patent attorney
Sawa 1) Tadao 6, Contents of amendment (1) In the first line of page 4 of the specification, the word "photo sensor" is corrected to read "photo coupler." (2) In the second line of page 7 of the same document, it says, ``You may.'' followed by ``Also, the first and second sensors 12 and 13 may be of a type other than the optical type described above, such as a Hall IC. It may also be a magnetic sensor using a magneto-resistance element, etc.".

Claims (1)

[Claims] 1. An actuator is provided with an electric motor and a worm reducer, and the worm reducer is composed of a worm gear connected to the electric motor, and a casing that covers the worm gear, and the rotation of the output shaft of the worm reducer is An actuator with a built-in detector, characterized in that a detector for detecting the number is provided, and the detector is disposed within the casing.