JPH02154178A - Manufacture of sensor case for magnetic sensor - Google Patents

Abstract

PURPOSE:To improve the manufacture efficiency of the magnetic sensor by inserting a wire into a wire insertion hole bored in a sensor case member, and then moving the wire and forming one rectangular unit hole. CONSTITUTION:The small-diameter wire insertion hole is bored in the sensor case member 26 at the left end part, and the wire W for wire cutting is inserted into the insertion hole and then moved horizontally to form a rectangular unit fitting hole 22A. Further, the wire W is moved horizontally to form a passing groove 25 and then forms a unit fitting hole 22B. Thus, remaining fitting holes 22C - 22H are formed continuously in order. Thus, the fitting holes 22A - 22H are formed continuously in the member 26 without being detached to manufacture one sensor case 21, so the manufacture efficiency is improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention uses a magnetically biased magnetoelectric conversion element to
For example, the present invention relates to a method of manufacturing a sensor case for a magnetic sensor used in a magnetic sensor configured as a banknote identification device for identifying the denomination of banknotes.

[Prior Art] Conventionally, magnetic sensors shown in FIGS. 6 to 9 are known as magnetic sensors for identifying characters and symbols on objects to be detected such as banknotes and securities printed with magnetic ink or the like.

In the figure, l is a rectangular parallelepiped sensor case made of a non-magnetic material such as plastic or aluminum die-casting, and the sensor case l has vertically penetrating holes as shown in Fig. 9 (d). 8 unit fitting holes 2A, 2B.

2C, ..., 2H (as a whole "unit fitting hole 2"
) is perforated therein, and both sides of the upper surface in the length direction are sloped surfaces 3.3 on which end surfaces of banknote guide plates (not shown) are located. Here, as shown in the figure, each of the unit fitting holes 2 is formed in a rectangular shape from a long surface 4 and a short surface 5, as shown in FIG. It is formed to be elongated in the direction perpendicular to the .

6 is a detection unit fitted into each unit fitting hole 2;
The detection unit 6 is made of a non-magnetic material such as plastic, as shown in FIGS. The section is buried and above.

A permanent magnet 8 whose lower surface is magnetized with an S pole and an N pole, a magnetoresistive element 9 as a magnetoelectric transducer provided on the upper surface of the permanent magnet 8 and magnetically biased by the permanent magnet 8, and the magnetoresistive element Terminal bin to connect 9 to the outside, 10.・
..., and the magnetic resistance element 9 is located near the upper opening of each unit fitting hole 2 on the banknote passing surface side, and detects the presence or absence of magnetic ink when the banknote passes over the head cover 12, which will be described later. Outputs a detection signal from.

Further, reference numeral 11 denotes a side spacer which is located on both sides of the magnetoresistive element 9 in the axial direction and is provided on the stem 5, and is made of a non-magnetic material such as plastic or ceramic.
The height dimension of the magnetic resistance element 9 is formed to be a microscopic dimension, for example, 0.1 mm higher than the upper surface side of the magnetic resistance element 9, so that if the head cover 12 is bent, the magnetic resistance element 9 may be damaged or piezo noise may be generated. Preventing it from occurring.

Furthermore, 12 closes the upper opening of the unit fitting hole 2 so that each magnetic resistance element 9 and the side spacer 1 are closed.
1, the head cover 12 is made of a non-magnetic and wear-resistant material such as tungsten, phosphor bronze,
A non-magnetic metal material made of titanium or an alloy thereof is used. The head cover 12 is made up of a flat surface portion 12A that is flat so as to guide banknotes, and adhesive surface portions 12B, 12B that are formed by folding both left and right sides of the flat surface portion 12A into two stages. Plane portion 12A, each adhesive surface portion 12B.

12B is the upper surface (sensing surface) of the sensor case l, the inclined surface 3
．． It is fixed by gluing it with adhesive from 3 to the side.

Here, as shown in FIG. 9, the sensor case l is constructed by drilling eight unit fitting holes 2 in the length direction in a rectangular sensor case member 13 made of a non-magnetic material and penetrating in the vertical direction. Each unit fitting hole 2
are generally formed by wire cutting through manufacturing steps as shown in FIGS. 9(a), (b), (c), and (d).

First, as shown in FIG. 9(a), the sensor case member 13
After setting the sensor case member 13 on a mounting table (not shown), eight wires are inserted at equal intervals along the length of the sensor case member 13 so as to penetrate the sensor case member 13 in the vertical direction (thickness direction) using a drilling means such as a drill. Insertion holes 14A, 14B, 14C,..., 14
A hole H (hereinafter referred to as "wire insertion hole 14" as a whole) is bored.

Next, as shown in FIG. 9(b), the wire insertion hole 14
After inserting the wire W into the first wire insertion hole 14A from above and below, the first unit fitting hole 2A is formed by passing the wire W in a horizontal direction in a rectangular shape while performing electrical discharge machining using the wire W as an electrode. .

Next, the unit fitting hole 2 in which the wire W was first machined
After removing it from A, as shown in FIG. 9(C), it is inserted into the second wire insertion hole 14B from above and below to form the second unit fitting hole 2B in the same manner as described above.

Hereinafter, the same procedure is repeated as shown in Figure 9 (D) (,3
The subsequent unit fitting holes 2C, . . . 2H are formed. In this way, as shown in FIG. 9(d), a sensor case l for a magnetic sensor having eight unit fitting holes 2 defined by the partition wall portion 15 is manufactured.

[Problem to be solved by the invention] However, in the manufacturing method of the prior art described above,
There are the following problems.

That is, each unit fitting hole 2A, 2B, 2C.

. . , 2H each time the molding process is completed for one hole, remove the wire W from that fitting hole, and insert the wire W into the next wire insertion hole 14B, 14c, . . . , 14H each time. The wire W has to be reinserted, and the work of removing and inserting the wire W is complicated, and as a result, the processing of the sensor case I is complicated.

There is a problem that it is not only troublesome but also requires a long time to process.

The present invention has been made in view of the problems of the prior art described above, and by making it possible to easily form a unit fitting hole in the sensor case member, it is possible to reduce the number of man-hours required for processing the sensor case. The present invention provides a method for manufacturing a sensor case for a magnetic sensor.

[Means to solve the problem]

The method of manufacturing a sensor case for a magnetic sensor adopted by the present invention in order to achieve the above-mentioned object includes a first step of drilling a small-diameter wire insertion hole penetrating the sensor case member in the thickness direction, and a step of drilling the wire insertion hole through the sensor case member in the thickness direction. a second step of inserting a wire for wire cutting into the hole and then moving the wire to form a rectangular unit fitting hole;
After forming the unit fitting hole, a third step of forming a wire passage groove by moving the wire by a predetermined length in the length direction of the sensor case member; and a fourth step of forming another rectangular unit fitting hole by moving the hole again.

Also, 3rd. By repeating the fourth step, three or more unit fitting holes can be formed.

[Effect]

With this configuration, the rectangular negative unit fitting hole is formed by inserting the wire into the wire insertion hole bored in the sensor case member and then moving the wire. Next, a wire passing groove is formed by moving the wire by a predetermined distance in the length direction of the sensor case member. Next, by moving the wire again, another rectangular unit fitting hole is formed. By simply moving the wire, the unit fitting holes can be formed one after another.

[Example] Examples of the present invention will be described below with reference to FIGS. 1 to 3. Note that the sensor case for the magnetic sensor manufactured according to this example is similar to the conventional technology in that a plurality of detection units having magnetoelectric conversion elements magnetically biased by a permanent magnet are housed in the unit fitting hole. Therefore, these explanations will be omitted.

First, FIGS. 1 to 3 show a first embodiment of the present invention.

In the drawings, reference numeral 21 indicates a sensor case manufactured according to this embodiment. The sensor case 21 is made of a non-magnetic material and is elongated as in the prior art, and has eight unit fitting holes 22A penetrating in the vertical direction (thickness direction).
, 22B, 22C.

..., 22H (as a whole, "unit fitting hole 22"
) is defined by the partition part 23, and both sides of the upper surface in the axial direction become inclined surfaces 24, 24 on which the end surfaces of the banknote guide plate (not shown) are located, and each unit fitting hole 22
Although it is similar to the prior art in that it is formed by wire cutting, each unit fitting hole 22 of this embodiment is formed by wire cutting.
They are different in that they are communicated with each other by a wire passing groove 25 formed so as to traverse the length direction of the sensor case 21 approximately at the center of each partition wall 23 except for the partition walls at both ends.

Next, as shown in FIG. 3, a method for manufacturing the sensor case 21 by drilling the unit fitting hole 22 in a rectangular sensor case member 26 made of a magnetic material by wire cutting will be described. The explanation will be based on.

First, the sensor case member 26 is set on a mounting table (not shown).

Next, in the first step shown in FIG.
7 in the vertical direction.

Next, in the second step shown in FIG. 3(B), after inserting the wire W for wire cutting into the wire insertion hole 27, the wire W is moved horizontally as shown by the arrow in the figure. A first unit fitting hole 22A having a rectangular shape is formed.

Next, in a third step shown in FIG. 3(c), by moving the sensor case member 26 or the wire W in the horizontal direction, the wire W is inserted into the first unit fitting hole
The wire passing groove 25 is formed by relatively moving the sensor case member 26 by a predetermined distance from approximately the center of the elongated surface 28 to the right side in the length direction of the sensor case member 26 .

Next, in the fourth step shown in FIG. 3(d), the wire W is moved again as shown by the arrow to form a second unit fitting hole 22B having a rectangular shape.

Thereafter, as shown in FIG. 3(e), by repeating the above-mentioned third and fourth steps, the remaining six unit fitting holes 22C9... 22H can be formed continuously, and along with this, each unit fitting hole 22A, 22B.

Between 22C9... and 22H, each of the wire passage grooves 2 is provided.
A partition wall section 23 is formed which is crossed by 5.

However, in this embodiment, eight wire insertion holes 22 are inserted into the sensor case member 26 without removing the wire W.
A, 22B, 22C, . . . , 22H can be formed in succession to manufacture one sensor case 21.
One sensor case 21 is manufactured compared to the case where one sensor case l is manufactured by repeatedly attaching and detaching the wire W every 2B, 2C, . . . 2H and performing individual wire cutting processing. The number of man-hours required for processing can be significantly reduced.

Further, FIGS. 4 and 5 show a second embodiment.

The sensor case 31 of this embodiment has four unit fitting holes 32A and 32B as shown in FIG.

32G and 32D (hereinafter referred to as "unit fitting holes 32"), and a right block having four unit fitting holes 34A, 34B, 34C, and 34D (hereinafter referred to as "unit fitting holes 34"). 35, and a partition part 36 that partitions both blocks 33.35, and each unit fitting hole 32.3 of each block 33.35.
The partition wall portions 37, 38 respectively defining the 4 are arranged traversed by wire passage grooves 39, 40.

In order to manufacture the sensor case 31 configured in this way, as shown in FIG. The first penetrating. Second wire insertion hole 4
2 and 43 are formed one by one.

Next, in a second step, the first wire insertion hole 4
2 by inserting the wire vertically into the first unit fitting hole 32 and moving the wire horizontally.
Form A. Next, the wire passing groove 39 is formed by performing the third and fourth steps, and then the second unit fitting hole 32B is formed in the same manner. After that, the third. By repeating the fourth step, the remaining two 3.4th unit fitting holes 32C and 32D are formed. As a result, four unit fitting holes 32 of the left block 33 are formed.

After that, after removing the wire from the fourth unit fitting hole 32D of the left block 33, the wire is inserted into the second wire insertion hole 43 of the right block 35 in a first step,
Next, in a second step, by moving the wire horizontally, the first unit fitting hole 3 of the right block 35 is moved.
Form 4A. Next, the third. By performing the fourth step, the wire passing groove 40 is formed, and then the second unit fitting hole 34B is formed in the same manner. Thereafter, the remaining two 3.4th unit fitting holes 34C and 34D are formed by performing the third and fourth steps. In this way, the sensor case 31 shown in FIG. 4 is manufactured.

When the method for manufacturing the sensor case for a magnetic sensor according to the present embodiment is configured in this way, the four unit fitting holes 32 of the left block 33 can be formed in succession by simply attaching the wire once. Next, four unit fitting holes 34 can be successively formed in the right block 35 by simply attaching and detaching the wires once during manufacturing. Therefore, by simply attaching and detaching the wire twice, a total of 8 unit fitting holes 3
2.34, and one sensor case 31 can be manufactured. For this purpose, as in the prior art, each unit fitting hole 2 is individually wire-cut.
Compared to the case where two sensor cases 1 are formed, the number of processing steps for forming one sensor case 31 can be reduced as much as possible.

In the first embodiment, eight unit fitting holes 22 are continuously formed in the sensor case member 26, and in the second embodiment, four unit fitting holes 32, 3 are formed in the sensor case member 41.
4 are formed in succession, but the present invention can be applied to any case where there are two or more unit fitting holes.

Furthermore, in the first embodiment, a case has been described in which the wire W is inserted into the wire insertion hole 27 and the wire W is moved in a rectangular shape. It is even more effective if the unit fitting hole 22 is formed by this method.

On the other hand, in the embodiment, the wire passage grooves 25, 39 and 40 are described as being formed by cutting the center of the partition wall portions 23, 37 and 38, but the wire passage grooves 25, 39 and 40 are not limited to this, and may be formed by cutting at any arbitrary position. You may.

Furthermore, it goes without saying that the wire insertion holes 27, 42, 43 may be formed at any position as long as the unit fitting holes 22, 32, 34 are to be formed.

[Effects of the Invention] As explained above, according to the present invention, two or more unit fitting holes can be formed in succession without attaching or detaching wire cutting wires during manufacturing, which is superior to conventional techniques. The number of processing steps required to form one sensor case can be reduced as much as possible. Therefore, sensor cases can be mass-produced in a short time, and the manufacturing efficiency of magnetic sensors can be improved.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the present invention, FIG. 1 is an external perspective view of a sensor case for a magnetic sensor manufactured according to this embodiment, and FIG. 2 is a diagram showing ■-■ in FIG. Cross-sectional views in the direction of line arrows, Figures 3 (a) and (b). (C), (D), (E), and (F) are process explanatory diagrams showing different processes for manufacturing a sensor case from sensor case members, and FIGS. 4 and 5 are diagrams showing the second embodiment of the present invention. An example is shown, FIG. 4 is a plan view of a sensor case manufactured according to this example, FIG. 5 is a plan view of a sensor case member for manufacturing the sensor case shown in FIG. 4 from a sensor case member, and FIG. 9 to 9 show magnetic sensors according to the prior art, FIG. 6 is an external perspective view of the magnetic sensor, FIG. 7 is a sectional view taken along the line ■-vn in FIG. 6, and FIG. ■■
- Sectional view in the direction of the line arrow, Figures 9 (a) and (b). (C) and (D) are process explanatory diagrams showing different processes for manufacturing a sensor case by forming a unit fitting hole in a sensor case member. 6... Detection unit, 8... Permanent magnet, 9... Magnetoresistive element (magnetoelectric conversion element), 21.31... Sensor case, 22, 32.34... Unit fitting hole, 23
．． 36, 37. 38... Partition wall part, 25, 39° 40.
...Wire passing groove, 26.41...Sensor case member, 27,42.43...Wire insertion hole, W...Wire. Patent Applicant: Murata Manufacturing Co., Ltd. Agent: Kazuhiko Hirose, Patent Attorney Figure ■ Figure Figure I) 1 place

Claims (2)

[Claims] (1) In the sensor case member made of a long non-magnetic material,
In the method of manufacturing a sensor case for a magnetic sensor, the sensor case is formed by forming a plurality of unit fitting holes in the length direction that penetrate the sensor case member in the thickness direction. a first step of inserting a wire for wire cutting into the wire insertion hole and then moving the wire to form a rectangular unit fitting hole; a third step of forming a wire passing groove by moving the wire by a predetermined length in the length direction of the sensor case member after forming the unit fitting hole; A method of manufacturing a sensor case for a magnetic sensor, comprising a fourth step of forming another unit fitting hole having a rectangular shape by moving the case. (2) By repeating the third and fourth steps, 3
A method of manufacturing a sensor case for a magnetic sensor according to claim 1, wherein at least one unit fitting hole is formed.