JPH0448129Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a magnetoresistive element mounting device for adjusting the gap between the magnetic drum and the magnetoresistive element of a magnetic encoder, which has been attracting attention as a sensor for motors, etc. It is something.

BACKGROUND ART In recent years, magnetic encoders have been used as sensors in various fields due to their stable characteristics and low cost. The most difficult part of the structure of a magnetic encoder is the mounting structure for adjusting the gap between the magnetic drum and the magnetic resistance element.

The conventional magnetoresistive element mounting structure described above will be described below with reference to the drawings.

FIGS. 4 and 5 show an overall view and a partial view of a conventional magnetoresistive element mounting structure.

In Figures 4 and 5, 1 is the motor body;
8 is a magnetic drum attached to the output shaft of the motor body 1, 5 is a magnetic resistance element attached with a constant gap Y to the magnetic drum 8, and 11 is a holder that holds the magnetic resistance element 5. . In this configuration, the holder 11 has an elongated hole 13a,
13b, and the holder 11 has elongated holes 13a,
It is fastened and fixed to the motor body 1 by screws 12a and 12b to 13b.

The operation of the magnetoresistive element mounting structure configured as described above will be described below.

Elongated holes 12a and 13b provided in the holder 11
is for adjusting the gap Y, and screw 12
By loosening a and 12b, it can be moved in the direction of arrow E. In other words, the magnitude of the gap Y changes. Movement within the elongated holes 13a and 13b is a manual operation.

Problems to be Solved by the Invention However, with the above configuration, since the gap is adjusted by the tactile sensation of the hand, not only the position of the gap Y cannot be determined accurately, but also the gap
Because of the relationship between the screws 12a and 12b with respect to the gap and the magnetic drum 8, an inclination or shift in parallelism with respect to the gap and the magnetic drum 8 also occurs. Furthermore, since the screws 12a and 12b are tightened after the gap position has been determined, there are horizontal, vertical, and tilt positional deviations that occur due to tightening.

Furthermore, in terms of work, it not only takes time, but also causes defects in encoder characteristics due to positional deviation, resulting in increased costs.

In view of the above problems, the present invention provides a structure for easily adjusting the gap between the magnetic drum and the magnetic resistance element, and eliminating the cause of positional deviation when the gap is fixed.

Means for Solving the Problems In order to solve the above problems, the magnetoresistive element mounting structure of the present invention includes a movable holder and a fixed holder that support the magnetoresistive element, and the movable holder is mounted on the basis of the fixed holder. It has a structure in which the gap can be adjusted by moving it by rotating a screw.

Function The present invention uses the above-described configuration to push the movable holder little by little with the screw, and stops the rotation of the screw at a position that satisfies the encoder characteristics, thereby ensuring that the gap is held securely. .
At this time, since the movable holder is moved along the fixed holder, the parallelism and perpendicularity of the magnetoresistive element are kept constant. Furthermore, it is possible to eliminate misalignment caused by tightening the screws when fixing the gap.

Embodiment A magnetoresistive element mounting structure according to an embodiment of the present invention will be described below with reference to the drawings.

1, 2, and 3 show the mounting structure in the embodiment.

In FIG. 1, FIG. 2, and FIG. 3, 1 is a motor body, which has an output shaft 2. As shown in FIG. First, a fixed holder 3 is fixed to the motor body 1 with screws 4a to 4c. Next, the recesses 6' provided on both sides of the movable holder 6 to which the magnetoresistive element 5 is attached are inserted in the direction of arrow D so as to align with the protrusions 9' of the pair of pillars 9 of the fixed holder 3. Ru. In this state, the magnetic drum 8 is mounted at a predetermined height position. The element fixing holder 3 is provided with a screw guide wall 10 shown in FIG.

Insert the screw 7 into this screw guide wall 10 and
By rotating in the direction, the movable holder 6
advances in the direction of arrow A along the support column 9 of the fixed holder 3. Then, at the point where the gap X is held, the rotation of the screw 7 is stopped and the movable holder 6 and the fixed holder 3 are fixed.

As described above, according to this embodiment, the movable holder 6 and the fixed holder 3 are provided, and furthermore, fitting portions are formed on both holders by unevenness, and when the movable holder is moved by the rotation of the screw with respect to the fixed holder. By providing this configuration, it becomes possible to accurately position the gap between the magnetic drum and the magnetic resistance element.

Effects of the Invention As is clear from the above explanation, the present invention can stabilize gaps and variations in the magnetic drum and the magnetic resistance element.

Stabilizing the gap contributes to stabilizing the magnetic encoder characteristics. In other words, this is a very large effect in terms of magnetic encoder characteristics that are proportional to the square of the distance.

Moreover, the simplicity of the work can greatly improve the number of man-hours required for conventional gap adjustment, and greatly contribute to lower costs as a magnetic encoder.

[Brief explanation of drawings]

FIG. 1 is a front sectional view of a magnetoresistive element mounting device according to an embodiment of the present invention, FIG. 2 is an enlarged perspective view of the main parts, FIG. 3 is a plan view of the same mounting device, and FIG.
5 are a plan view and a perspective view of a main part showing a conventional magnetoresistive element mounting structure. 3...Fixed holder, 5...Magnetic resistance element, 6
...Movable holder, 6'...Recess, 7...Screw,
8...Magnetic drum, 9'...Protrusion, 10...Screw guide wall.

Claims (1)

[Scope of utility model registration request] A movable holder made of a non-magnetic material to which a magnetic resistance element is attached, and a fixed holder having a convex portion that fits into a recess provided in the movable holder, and a screw guide is provided in a portion of the fixed holder located on the back side of the movable holder. A wall is provided, and the movable holder is screwed into a screw hole formed in the center of the screw guide wall, and the center part of the back surface of the movable holder is pressed, and the fixed holder and the movable holder are fitted with a concave and a convex shape. A mounting device for a magnetic resistance element that is provided with an adjustment screw that moves it relative to a magnetic drum.