JP2531260Y2 - Magnetic encoder - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic encoder, and more particularly, to a method for fixing a gap between a magnetic sensor and a gear after assembling adjustment so that a device can be used with the same characteristics as when assembling when the device is mounted. Regarding new improvements.

[0002]

2. Description of the Related Art There have been various types of magnetic encoders of this type which have been used in the past. Among them, a typical one is described, for example, in the configuration disclosed in Japanese Patent Application Laid-Open No. 1-50910. Can be mentioned. That is, FIG.
3 is a holding body rotatably having a rotating shaft 3 having a gear 2 made of a magnetic material. The gear 2 has a plurality of gears on its outer periphery as shown in FIG. It has teeth 2a.

At a position adjacent to the gear 2, a magnetic sensor 5 provided on a holder 4 is disposed with a certain gap D therebetween.

Accordingly, when the gear 2 rotates, the teeth 2a and the concave portions 2b alternately correspond to the magnetic sensor 5, so that a signal can be detected from the magnetic sensor 5, and this signal is rotated. This is a detection signal.

[0005]

Problems to be Solved by the Invention Since the conventional magnetic encoder is configured as described above, there are the following problems. That is, the above-mentioned gap D is strictly adjusted at the time of assembly and is controlled, but when the magnetic encoder is shipped, the above-mentioned gap D is arbitrarily transported, and the user is required to mount the gap D on the device. In some cases, the reproducibility of the gap D at the time of assembling may be deviated, in which case the characteristics of the output pulse may be changed and may be different from the good characteristics immediately after assembling.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. In particular, the gap between the magnetic sensor and the gear after assembly adjustment is fixed, and when the device is mounted, it is used with the same characteristics as during assembly. It is an object of the present invention to provide a magnetic encoder that can be used.

[0007]

SUMMARY OF THE INVENTION A magnetic encoder according to the present invention is a magnetic encoder in which the rotation of a rotatable gear made of a magnetic material is detected by a magnetic sensor, and the magnetic sensor is held. It has a holder and couples the gear and the holder via a coupling body that comes into contact with a spigot portion of the gear, and the coupling body is detachable from the gear and the holder via a screw.

[0008]

In the magnetic encoder according to the present invention, since the coupling body is detachable from the gear and the holder via the screw, when the encoder is assembled, the gap between the gear and the magnetic sensor is adjusted to an optimum state. After assembly, the gap is fixed by screwing the combined body to the gear and the holder, and the product is shipped in this state. After shipment, the user attaches it to the device as it is, and after the attachment is completed, detaches the combined body from the gear and the holder, so that the same optimal gap as after assembly adjustment can be maintained after attachment, and the device can be used. Even in such a case, detection with good characteristics can be performed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the magnetic encoder according to the present invention will be described in detail with reference to the drawings. The same or equivalent parts as those in the conventional example will be described with the same reference numerals. FIG. 1 is a sectional view showing a magnetic encoder according to the present invention.

In the drawing, reference numeral 10 designates a casing comprising a rear lid 10a and a front lid 10b. In this casing 10, the holder 4 can be adjusted in position via a base 11 via screws 12. It is provided in.

A pair of bearings 13 and 14 provided in the casing 10 are rotatably provided with a rotating shaft 3 made of a magnetic material and having a gear 2 having a spigot portion 2A. Is formed with a plurality of teeth 2a. The spigot portion 2A is formed integrally with the gear 2 so as to protrude stepwise.

A first screw hole 2 is provided on an upper surface 2e of the gear 2.
c, and a second screw hole 4a is also formed in the holder 4. On the upper surface 2e and the holder 4, a coupling body 15 having an overall L-shape is provided with a pair of first and
It is provided detachably via the second mounting screws 16 and 17. In this case, the coupling body 15 is positioned in contact with the spigot portion 2A of the gear 2.

The first mounting screw 16 penetrates through the first hole 18 of the combined body 15 and is screwed into the first screw hole 2c. The second mounting screw 17 is formed by a fool hole of the combined body 15. It passes through the elongated hole 19 and is screwed into the second screw hole 4a.

Therefore, at the time of assembly, the gap D between the gear 2 and the magnetic sensor 5, which is the most important, is optimized by the magnetic encoder, and a highly accurate rotation detection signal is obtained from the magnetic sensor 5. The holder 12 is loosened and adjusted to the optimum state while the holder 4 is moved.

As described above, after the assembly adjustment is completed, the gap D is maintained in an immovable state by connecting the connecting body 15 to the gear 2 and the holder 4 via the respective mounting screws 16 and 17. In this state, the magnetic encoder 20 is shipped.

The magnetic encoder 20 after shipment is mounted on a device (not shown) on the user side, and then the combined
By removing 5, the characteristics of the magnetic encoder 20 having the optimum gap that does not change after the assembly adjustment can be maintained.

The structure of the above-described combined body 15 is merely an example, and a similar function and effect can be obtained even when a similar structure is used.

[0018]

Advantages of the Invention The magnetic encoder according to the present invention is configured as described above, so that the following effects can be obtained. That is, since the product can be shipped with the optimum gap maintained after the assembly adjustment, the characteristics at the time of mounting the device can be made the same as those at the time of assembly, and the magnetic type having good characteristics regardless of transportation. An encoder can be attached to a device.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a magnetic encoder according to the present invention.

FIG. 2 is a configuration diagram showing a conventional magnetic encoder.

FIG. 3 is a side view of a main part in FIG. 2;

[Explanation of symbols]

 Reference Signs List 2 gear 2A spigot part 4 holder 5 magnetic sensor 15 coupling body 16 first mounting screw 17 second mounting screw

Claims (1)

(57) [Scope of request for utility model registration] A magnetic encoder configured to detect rotation of a rotatable gear (2) made of a magnetic material by a magnetic sensor (5), wherein a holder (4) holding the magnetic sensor (5) is provided. ), The spigot part (2A) of the gear (2)
The gear (2) and the holder (4) are coupled via a coupling (15) that abuts on the gear (2), and the coupled body (15) is attached to the gear (2) and the holder (15). A magnetic encoder characterized by being configured to be detachable via screws (16, 17).