JPH04115120A - Assembling method for magnetic-type rotary encoder - Google Patents

Abstract

PURPOSE:To adjust the gap between a magnetic drum and a magnetic sensor before assembling parts into a rotary machine by adjusting the gap between the magnetic drum and the magnetic sensor in a preliminary step, thereafter conveying the encoder under the state of a block as a unitary body, and assembling the block into the rotary machine in a main step. CONSTITUTION:When the gap between a magnetic drum 21 and a magnetic sensor 22 is properly adjusted, the drum 21 is inserted into a reference shaft and fixed. A sensor holding body 27 is fixed to a housing 25. The housing 25 and the reference shaft are relatively moved. After the adjustment of the gap, a cover 26 is deposited on the housing. The drum 21 is pushed and held with the member 27. The reference shaft is removed from the drum 21. At this time, the drum 21 and a sensor holding body 23 are kept in the constant relative positional relationship. Then, the housing 25 is fixed to a rotary machine 24 in a main step. Thus, the gap between the drum 21 and the sensor 22 can be adjusted before assembling the drum part 21, the member 27 and the holding body 24. Thereafter, the member 27 is operated from the outside of the cover 26, and the pushing state of the drum 21 is released.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for assembling a magnetic rotary encoder,
In particular, the present invention relates to a method of assembling a magnetic rotary encoder that is easy to incorporate into a rotating machine such as a motor.

[Prior Art] FIG. 10 shows a conventional example of this type of magnetic rotary encoder, which is described in Japanese Utility Model Application Publication No. 62-3012 and the like. In the figure, l is a magnetic drum, 2 is a rotating machine, 3 is a rotating shaft, 4 is a base material, 5 is a holding member, 6 is a magnetic sensor, 7 is a printed circuit board, 8 is a lead wire, 9 is a support cylinder, 10 The cover 11 is a circuit component, and the reference numeral 12 is a screw.

The magnetic drum 1 is made of a magnetic material, and has magnetic patterns N, S, S, N, N, S, S on its circumferential surface.

Pairs of adjacent horizontally magnetized magnetic poles, such as N..., are continuously formed at equal pitch intervals so that they have opposite polarities. A rotating shaft 3 protrudes from a rotating machine 2 such as a motor, and the rotating shaft 3 is fixed to the center of the magnetic drum 1. At one end of this rotating machine 2, there is a stepped portion 2 that serves as a mounting reference surface.
a is formed, and the base material 4 is screwed to the stepped portion 2a. This base material 4 is disk-shaped, and its upper surface is a reference plane part 4a perpendicular to the axis of the rotating shaft 2, and the holding member 5 is screwed onto this reference plane part 4a. A magnetic sensor 6 made of a magnetoresistive element is adhered to the holding member 5, and the magnetic sensor 6 faces the circumferential surface of the magnetic drum 1 with a predetermined distance therebetween. The printed circuit board 7 is equipped with a circuit component (1) that processes the electrical signal output from the magnetic sensor 6, and the printed circuit board 7 is screwed into the base material 4 by inserting a screw 12 through the support tube 9. Therefore, it is arranged above the magnetic drum 1. One end of the lead wire 8 is connected to the magnetic sensor 6, and the other end is connected to the printed circuit board 7. A cover 10 is attached to the end face of the rotating machine 2, and the cover 10 protects the magnetic drum l, the magnetic sensor 6, etc. from dust.

Two sets of magnetoresistive elements constituting the magnetic sensor 6 are arranged so as to be out of phase by np+1/4p (where n is an integer) with respect to each magnetic pole pitch p of the magnetic pattern magnetized and arranged on the magnetic drum 1. Further, these magnetoresistive elements are arranged opposite to the magnetic pattern so that their respective magnetic directions are perpendicular to the rotation axis 3. Therefore, when the magnetic drum l rotates, each magnetoresistive element of the magnetic sensor 6 outputs a signal having a phase difference of 90 degrees.

In the magnetic rotary encoder configured as described above, when the magnetic drum 1 is rotated in a predetermined direction by the rotary machine 2, a continuous signal with a phase difference of 90 degrees is output from each magnetoresistive element of the magnetic sensor 6. A signal is output,
Incremental pulses are obtained by guiding these to the printed circuit board 7 via the lead wire 8 and performing processing such as amplification, detection, and matching in the signal processing circuit, and the displacement and rotation direction of the magnetic drum l are detected. Ru.

When adjusting the required gap between the magnetic drum 1 and the magnetic sensor 6, with the base material 4, the holding member 5, and the magnetic sensor 6 installed in the rotating machine 2, the holding member 5 is moved relative to the to obtain the appropriate gap,
The holding member 5 is fixed to the base material 4.

[Problem to be solved by the invention]

By the way, in the prior art described above, the magnetic drum l
When adjusting the gap between the base material 4 and the magnetic sensor 6,
Since it is necessary to carry out the adjustment while the holding member 5 and the magnetic sensor 6 are assembled in the rotating machine 2, there is a problem that the gap adjustment in this state becomes difficult and requires a special gap adjustment machine. In addition, since the rotating machine 2 is required for this gap adjustment, it is necessary to prepare the rotating machine 2 in advance.

The present invention has been made in view of the actual situation in the prior art, and its purpose is to provide a method for assembling a magnetic rotary encoder that can adjust the gap between the magnetic drum and the magnetic sensor before incorporating it into a rotating machine. Our goal is to provide the following.

[Means to solve the problem]

To achieve this objective, the present invention includes a magnetic drum having a magnetic pattern in the circumferential direction, a sensor holder for holding a magnetic sensor, and a housing to which the sensor holder is attached and attached to one end of a rotating machine. , a cover having a built-in holding member that presses and holds the magnetic drum, and a release means that operates the holding member from outside the cover to release the pressed state, and first, as a preliminary step, the magnetic drum is set as a reference. The sensor holder is inserted and fixed to the shaft, and the sensor holder is attached to the housing, and then the housing and the reference shaft are moved relatively to adjust the required gap between the magnetic drum and the magnetic sensor. After that, the cover is attached to the housing and the magnetic drum is pressed and held by the holding member, and then the reference shaft is removed from the magnetic drum that is pressed and held, and then, as the main step, the The drum is inserted and fixed onto the rotating shaft of the rotating machine, and the housing is fixed to the mounting reference surface of the rotating machine before and after this, and the holding member is operated from outside the cover to control the pressed state of the drum. This is the configuration to release it.

[Function] Since the present invention is configured as described above, when adjusting the required gap between the magnetic drum and the magnetic sensor to an appropriate state in the preliminary process, the magnetic drum is inserted and fixed onto the reference shaft, and , a sensor holder is attached to the housing, and the housing and the reference axis are moved relative to each other.

After adjusting the gap in this way, a cover is attached to the housing and the magnetic drum is pressed and held by the holding member, and in this state, the base and axle are removed from the magnetic drum.

At this time, since the magnetic drum is held under pressure by the holding member, the magnetic drum and the sensor holder are maintained in a constant relative positional relationship, and therefore the relative positional relationship between the magnetic drum and the magnetic sensor is constant. is set to . Next, in the subsequent main step, the housing is fixed to the rotating machine while maintaining the relative positional relationship set during the gap adjustment between the magnetic drum and the magnetic sensor, and the magnetic drum, positioning member, and sensor holder are assembled. This makes it possible to adjust the gap between the magnetic drum and the magnetic sensor before installing it into a rotating machine. Thereafter, the holding member is operated from outside the cover to release the pressed state of the magnetic drum, so that there is no problem with the rotational operation of the rotating machine.

[Example] Hereinafter, an example of the method for assembling a magnetic rotary encoder of the present invention will be described based on the drawings.

1 to 9 are diagrams illustrating an embodiment of the method for assembling a magnetic rotary encoder according to the present invention. FIG. 1 is a perspective view showing the overall structure of the magnetic rotary encoder, and FIG. The bottom view and FIG. 3 are cross-sectional views taken along line A-A of the cover in FIG. 2, and FIGS. 4 and 5 are main parts taken along line B-B and line C-C of the cover in FIG. 2, respectively. The sectional view, FIGS. 6 and 7 are process diagrams each explaining a preliminary process of the assembly method, and FIGS. 8 and 9 are process diagrams each explaining the main process of the assembly method.

The magnetic rotary encoder used in this example is
As shown in FIG. 1, a magnetic drum 21 having a magnetic pattern in the circumferential direction, a sensor holder 23 holding a magnetic sensor 22, and this sensor holder 23 are attached and fixed to a mounting reference surface of a rotating machine 24. The magnetic drum 21 is comprised of a housing 25, a cover 26 that is attached to the housing 25, and a holding member 27 that is built into the cover 26 and presses and holds the magnetic drum 21 against the housing 25.

The above-mentioned magnetic drum 21 is made of a magnetic material like the conventional one shown in FIG.
There are N and S magnetic patterns on the circumference.

Adjacent magnetic pole pairs such as S, N, N, S, S%N, etc. are continuously formed at equal pitch intervals so that the polarity is opposite, and on the upper part of this large diameter portion 21a, A conical protrusion 21b is formed. At the center of the magnetic drum 21, a rotating shaft 24 protrudes from a rotating machine 24 such as a motor.
a is fixed.

The sensor holder 23 described above is attached to the housing 25 by screws 3.
1, a connector 33 attached to the printed circuit board 32 and connected to the outside,
It has a sensor circuit board 35 that is held by a pair of protrusions 34 on the housing 25, is connected to a printed circuit board 32, and has a magnetic sensor 22 and a signal processing circuit mounted thereon.

Further, the above-mentioned magnetic sensor 22 made of a magnetoresistive effect element is adhered to this sensor holder 23, similar to the conventional one shown in FIG.
2 faces the circumferential surface of the outer diameter portion 21a of the magnetic drum 21 with a predetermined distance therebetween.

The holding member 27 described above includes a base 4 having a cylindrical body 41 and a pair of protrusions 42 formed in the axial direction of the rotating shaft 24a.
3, a pair of block bodies 44 integrally formed at the lower part of the cylindrical body 41, and a spring 4 provided on each protrusion 42.
A steel ball 46 to which an upward spring force is applied via a steel ball 46, a rotation screw 47 screwed into the upper part of the cylindrical body 41, and a plate fixed to the upper part of the cylindrical body 4 by the rotation screw 47. body 4
8, and a return spring 49 that is provided on the cylindrical body 41 and applies an upward spring force to the holding member 27 via the plate body 48. Further, as shown in FIG. 6, the lower part of the base 43 is formed with a recess 50 for receiving the conical protrusion 2, and an elastic member 51 made of rubber or the like is provided at the lower part of the base 43. There is.

As shown in FIG. 3, the above-mentioned cover 26
The holding member 270 cylindrical body 4 penetrates along the axial direction of the holding member 270.
A through hole 61 into which is inserted is provided. In this through hole 61, as shown in FIG. A spring 63 is provided to automatically adjust the axis of the cylindrical body 41 in accordance with the axis of the cylindrical body 41. Also, a pair of storage portions 64 are formed near the nine blowers 62 to store the block bodies 44 of the holding member 27, respectively. The plate body 48 of the holding member 27, the return spring 49, etc. are arranged above the through hole 61.

Further, inside the cover 26, as shown in FIGS. 2 and 5, a pair of grooves 65 are formed in the circumferential direction of the cover 26, and in which the steel balls 46 of the holding member 27 slide, respectively.
As shown in FIG. 4, a vertical hole 66 is formed upward from the end of the valley groove 65 and accommodates the steel ball 46 and the spring 45.
and is provided. As shown in FIG. 1, the outer circumferential portion of the cover 26 includes a mounting portion 69 each having one through hole 68 into which three screws 67 for fastening the cover 26 to the motor 24 are inserted; Attach the cover 26 to the housing 2
5 through-hole 71 into which two long screws 70 are inserted
A mounting portion 72 having one each, and a notch portion 73 that engages with the printed circuit board 32 are provided. The screw 47, the groove 65, and the vertical hole 66 constitute a release means for operating the holding member 27 from the outside of the cover 26 to release the pressed state.

As shown in FIG. 1, the above-mentioned housing 25 includes the above-mentioned protrusion 34, a hole 81 at the center into which the rotating shaft 24a is inserted, and a cylindrical shape made of rubber or the like that is attached to this hole 81. The elastic member 82, a pair of screws 683 into which the long screws 70 are screwed together, and holes 8 formed opposite to the screw holes 24b on the mounting reference surface of the rotating machine 24 and into which the screws 67 are inserted.
4.

In this embodiment, first, as a preliminary process, as shown in FIG. A substrate 93 having a hole 92 into which a sensor 91 is inserted and movable relative to the reference axis 91 is provided, and a housing 25 to which a sensor holder 23 is attached is fixed onto the substrate 93. On the other hand, a cylindrical through hole provided with the rotation center of the magnetic drum 21 as the axis is inserted into the reference shaft 91 and temporarily fixed.

Next, the required gap between the magnetic drum 21 and the magnetic sensor 22 is adjusted by moving the substrate 93 in the left-right direction in FIG. 6 relative to the reference axis 91.

Thereafter, as shown in FIG. 7, a cover 26 is attached to the housing 25, that is, the magnetic drum 21 and the like are covered with the cover 26, and the cover 26 is fixed to the housing 25 with a long screw 7o.

At this time, since the steel balls 46 of the holding member 27 come into contact with the grooves 65, a downward spring force is applied to the base 43 by the compression of the spring 45, and as a result, this holding member 27
The magnetic drum 21 is held against the housing 25 by pressing. In this state, the reference shaft 91 is removed from the magnetic drum 21, and the housing 25 is removed from the board 93.
Remove it to obtain an integrated block.

After the block obtained in this way is conveyed to the assembly maker, the assembly maker, as shown in FIG. Magnetic drum 2 on 24a
In addition to inserting the first through hole, press-fitting is performed, for example, as one of the fixing means. At that time, the magnetic drum 2 is held until the block body 44 of the holding member 27 comes into contact with the inner surface of the cover 26.
1 is raised, and the magnetic drum 21 is set at a height position of 2. Around this time, the housing 25 is attached to one end of the rotating machine 24, and the screw 67 shown in FIG. Screw together.

Next, by rotating the screw 47 of the holding member 27 at the top of the cover 26 using a driver (not shown), the holding member 27 itself rotates, and the steel ball 46 is moved into the groove 65.
slide. Then, the steel ball 46 and the spring 45
As shown in the figure, the terminal end of the groove 65 is accommodated in the vertical hole 66,
The biasing state of the spring 45 described above is released, and as a result, the state in which the holding member 27 presses and holds the magnetic drum 21 is released. At this time, since the block body 44 is stored in the storage section 64, the holding member 27 is pulled upward from the above-mentioned setting position by the return spring 49, and the magnetic drum 2
1.

In the embodiment configured as described above, after adjusting the cap between the magnetic drum 2 and the magnetic sensor 22 in the preliminary process, the block is transported in the form of an integrally fixed block, and this block is transferred to the rotating machine 24 in the main process. The gap between the magnetic drum 21 and the magnetic sensor 22 can be adjusted before it is assembled into the rotating machine 24.

Furthermore, since the gap between the magnetic drum 21 and the magnetic sensor 22 is adjusted in advance as described above, the holding member 27 can be removed after being attached to the rotating shaft 24a and integrated, without requiring gap adjustment in this process. By operating it, it can be easily incorporated into the rotating machine 24.

[Effect of the invention 1] Since the present invention is configured as described above, the gap between the magnetic drum and the magnetic sensor can be adjusted before being incorporated into the rotating machine. Therefore, the gap can be adjusted after being incorporated into the rotating machine. Compared to the conventional case, it is easier to adjust the gap between the magnetic drum and the magnetic sensor, and there is no need for a special gap adjustment machine. Further, since a rotating machine is not required for gap adjustment, it is possible to save time and effort to prepare the rotating machine in advance.

[Brief explanation of drawings]

1 to 9 are diagrams illustrating an embodiment of the method for assembling a magnetic rotary encoder according to the present invention. FIG. 1 is a perspective view showing the overall structure of the magnetic rotary encoder, and FIG. The bottom view and FIG. 3 are cross-sectional views taken along line A-A of the cover in FIG. 2, and FIGS. 4 and 5 are main parts taken along line B-B and line C-C of the cover in FIG. 2, respectively. The sectional view, FIGS. 6 and 7 are process diagrams each explaining the preliminary steps of the assembly method, FIGS. 8 and 9 are process diagrams each explaining the main process of the assembly method, and FIG. 10 is the magnetic rotary FIG. 2 is a sectional view showing a conventional example of an encoder. 21...Magnetic drum, 22...Magnetic sensor, 23...Sensor holder, 24...
・Rotating machine, 24a...Rotating shaft, 25...
Housing, 26・Old・Cover 27...Holding member, 45...Spring, 46...Steel ball, 4
7...Rotation screw, 49...Return spring, 61...Through hole, 65...Groove, 66...
...Vertical hole. Figure Figure Figure Figure Figure! !

Claims (1)

[Claims] A magnetic drum having a magnetic pattern in the circumferential direction, a sensor holder holding a magnetic sensor, a housing to which the sensor holder is attached and attached to one end of a rotating machine, and a holding member that presses and holds the magnetic drum. It is equipped with a built-in cover and a release means for operating the holding member from the outside of the cover to release the pressed state.First, as a preliminary step, the magnetic drum is inserted and fixed to the reference shaft, and the magnetic drum is inserted and fixed to the housing. After installing the sensor holder and then relatively moving these housings and reference shafts to properly adjust the required gap between the magnetic drum and the magnetic sensor, the cover is attached to the housing. The magnetic drum is held by the holding member under pressure, and then the reference shaft is removed from the magnetic drum held under pressure, and after that, as a main step, the drum is attached to the rotating shaft of the rotary machine. is inserted and fixed, and before and after this, the housing is fixed to the mounting reference surface of the rotating machine, and the holding member is operated from outside the cover to release the pressed state of the drum. How to assemble a magnetic rotary encoder.