JPS611257A - Manufacture of yoke of linear pulse motor - Google Patents

Abstract

PURPOSE:To prevent an inconvenience caused by a cutting work from occurring by omitting the cutting work of a coupler provided to hole the positional relationship between pole members. CONSTITUTION:A nonmagnetic metal plate is punched by pressing to form a cross-shaped coupling member 20. Similarly an iron plate is punched by pressing to form a substrate 21 formed with a cross-shaped hole 21a at the prescribed position of the center. Then, the member 20 is engaged with the hole 21a of the substrate 21, and secured by copper brazing. Then, the portion designated by broken lines in drawings is punched by pressing to form a yoke 22 coupled through the member 20 with plate-like pole members 21b, 21c, 21d, 21e. According to the method, since it is not necessary to provide the coupling member of frame shape for holding the positional relationship between the pole members, the yield of the material is improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a yoke incorporated in a primary side magnetic flux generating device of a linear pulse motor, in particular, a plurality of plate-shaped magnetic pole members are arranged in a plane and mutually connected to each other. The present invention relates to a method of manufacturing a connected yoke.

[Prior art]

The IJ=7 pulse motor is a reciprocating type.
Because of its high performance as a printer, it has come to be applied to a variety of information terminal equipment, such as the head feed of various printers that require accurate positioning control, and the head feed of photoelectric readers. However, in recent years, there has been a growing trend for %OA terminal equipment to become smaller and thinner, and along with this trend, there has been an increasing demand for smaller and thinner linear pulse motors themselves.

In view of the request to avoid construction, Figures 2 to 5 of the filing of this application have been prepared.
The linear pulse motor shown in the figure was developed. This linear pulse motor has four poles 1a.

It is equipped with a primary side magnetic flux generating device l having lb, lc, and ld, and a secondary side scale 2 supported linearly and movably on the magnetic flux generating device 1, and has two excitations of the magnetic flux generating device 1. Coil 33. , 3 h is used to advance either the magnetic flux generator +tl or the secondary scale 2 by a fixed distance by inputting a predetermined pulse signal to h, and the driving principle is the same as the previous one. However, as is clear from FIG.
h.

IC, 1dlCt:! 'Plate-shaped magnetic pole members 4, 5, 6.7
■ Each plate-shaped magnetic pole member 4, 5, 6.7 has a head 4 Q, + 5 a 16 a on which the pole teeth 8 are provided.
+7a and legs 4h, 5b, 61), 7b extending from the heads 4, +5a, 6a, +7a and to which the magnetic frame 9 wound with the excitation coil aa and 3ht is fixed. ■Magnetic pole member 4.5, 6°7
Each other to each other's head 4 + 5 Q, 6 a
Excitation coils 3a and 3b are arranged in a planar shape and in a substantially H shape with the +7a brought close to each other, and excitation coils 3a and 3b are arranged between the opposing leg portions 4b, 5b, 6h and 7b; is a slit plate 1 provided with slits 108 at predetermined intervals.
0 by adhering it to the surface of the plate-shaped magnetic pole member 4, 5° 6.7, ■ a permanent magnet 11 having a predetermined polarity as the magnetic pole 1 a, + 1 p, ] c,
1 (1) It is essential to have a characteristic structure such as bonding to the back side of the plate-shaped magnetic pole members 4, 5, 6, and 7, and these essential structures make it possible to completely reduce the thickness.

[Problem that the invention seeks to solve]

By the way, conventionally, the magnetic flux generating device 1 as described above is manufactured. At tA&, the four magnetic pole members 4.5°6.7 are arranged in advance in the four magnetic pole parts 4.5°6.7 as shown in FIG.
, Fi, 6.7 are formed by integrally structured yokes (described poles) 12 connected in a predetermined positional relationship when actually assembled, and on the other hand, each magnetic pole member 4, 5, 6.7 is The slit plate 10 that forms the pole teeth 8 on the head surface is also formed into an integral structure with slits 108 provided at predetermined pinch points at four locations corresponding to the yoke 12. The manufactured slit plates 10 are fixed with permanent magnets 1 and adhesive VC (see FIG. 7(A)).

As shown by the broken line in (B), there is an unnecessary connecting portion 10I.

According to this manufacturing method, the mutual position +i of the magnetic pole members 4, 5, 6.7 is cut.
! However, in the 51 methods mentioned above, especially York 1
The manufacturing method of 2 has the following disadvantage 2. Figures and Figure 7 (B
), unless a frame-shaped connecting part 12a is provided that surrounds the outer periphery of the magnetic members 4, 5, 6, and 7 and fully connects these members 4, 5-, 6, and 7, However, since this connecting part 12 will be cut and become unnecessary,
Interest yield is poor.

(2) Magnetic pole member 4.5 connected to the connecting part 12a
, 6.7 is glued to the permanent magnet 11, Figure 7 (B)
Since it is cut as shown by the broken line, an unreasonable load is applied to the adhesive layer between each magnetic pole member 4, 5, 6° 7 and the permanent magnet 11 during this cutting operation, making the strength of the adhesive part unstable. There is a fear.

(31 As mentioned above, each magnetic pole member 4° 5.
6.7 will be deformed, so after this cutting work, it is necessary to grind the top surface of each magnetic pole member 4゜5, 6.7, but since the permanent magnet 11 is glued to the bottom surface, (4) It is not suitable for mass production because it requires multiple steps for assembly.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and it is possible to omit the cutting work of the connecting portion provided to maintain the mutual positional relationship of the magnetic pole members during the assembly work of the yoke. To prevent inconveniences caused by cutting work! ! [Structure of the Invention] This invention aims to provide a method for manufacturing a yoke for a linear pulse motor. a second step of embedding and fixing a non-magnetic material into the opening of the magnetic plate formed in the first step, and striking the magnetic plate to which the non-magnetic material has been fixed in the second step. [Embodiment] Fig. 1 (a) - 1) is a perspective view for explaining one embodiment of the yoke manufacturing method according to the present invention. A non-magnetic metal plate (for example, a stainless steel plate) is punched out by press processing without being cut, and is shaped into a cross shape as shown in FIG. 1(A). Similarly, an iron plate is punched out by press working to form the connecting member 20 of the first
A cross-shaped opening 21 is provided at a predetermined location in the center as shown in Figure (b).
Here, the opening 2 is formed to form the substrate 21 in which the
The shape of 1a is formed to be substantially the same as that of the connecting member 20.

Next, the connecting member 20 is fitted into the opening 21a of the substrate 21 and fixed behind the copper brazing (copper brazing) process. Even if you use it, it is difficult. As a result, as shown in FIG. 1(c), a substrate 21 is formed in which the connecting member 20 is fitted into the opening 21a and fixed thereto.

Next, by punching out the part indicated by the broken line in FIG. 1(c), the conventional magnetic pole members 4, 5, 6.7 (FIGS. 6 and 7 fB) as shown in FIG. A plate-shaped magnetic pole member 21b having the same shape as (see).

A yoke 22 is formed in which 21c, 21d, and 21e are interconnected via a connecting member 20.

Next, after the yoke 22 is ground on both sides,
The permanent magnet 11f (see FIGS. 6 and 7 CB)) is adhered and sent to the assembly process of the negative side magnetic flux generator 1 (see FIG. 2 and FIG. 5).

Note that the connecting member 2 is inserted into the opening 21a formed in the substrate 21.
The plate-shaped magnetic pole member 2 is formed by injecting molten brazing filler metal directly into the brazing filler metal without inserting it into the plate-shaped magnetic pole member 2.
1b, 21c, 21d.

210 may be connected to each other. [Effects of the Invention] As explained above, if the present invention is implemented, the step @l of forming an opening of a predetermined shape in the magnetic plate, and the first step A second step of embedding and fixing a non-magnetic material into the opening of the magnetic plate formed behind the process, and a first step of punching out the magnetic plate to which the non-magnetic material has been fixed in the second step. and a third step of forming a plurality of plate-shaped magnetic pole members interconnected via the non-magnetic material, the following effects can be obtained. Since there is no need to provide a frame-shaped connecting member to maintain the positional relationship between Since the magnetic pole members are firmly connected through the non-magnetic material, the mutual positional relationship between the magnetic pole members can be stably maintained.

(3) All cutting and grinding are performed before gluing the permanent magnet to the magnetic pole member, making the entire process easy. (4) The assembly work can be simplified and mass production can be achieved since the magnetic pole member is not deformed during machining.

[Brief explanation of the drawing]

FIGS. 1(a) to 5) are perspective views for explaining an embodiment of the yoke manufacturing method according to the present invention, and FIGS. 2 to 5 are diagrams showing the configuration of a conventional linear pulse motor. The figure is a plan view, Figure 3 is a front view, Figure 4 is a partially cutaway right side view, Figure 5 is an exploded perspective view, Figures 6 and 7 (A1. (B)
2A and 2B are exploded perspective views and plan views, respectively, for explaining the conventional method of manufacturing the yoke 12. FIG. 20... Connection member (non-magnetic material), 21...
...Substrate (magnetic plate 1.21a...opening, 2
1b to 21e...Plate magnetic pole members, 22...
...Yoke, Figure 2, Figure 3, Figure I, Figure 4, Figure 6, Figure 7

Claims (3)

[Claims] (1) A first step of forming an opening of a predetermined shape in the magnetic plate, a second step of embedding and fixing a non-magnetic material into the opening of the magnetic plate formed in the first step, and and a third step of punching out the magnetic plate to which the non-magnetic material is fixed in step 2 to form a plurality of plate-shaped magnetic pole members interconnected through the non-magnetic material. A method for manufacturing a yoke for a linear pulse motor characterized by: (2) The linear pulse motor according to claim 1, wherein in the second step, the non-magnetic plate having a predetermined shape is fitted into the opening of the magnetic plate and fixed by brazing. Yoke manufacturing method. (3) The method of manufacturing a yoke for a linear pulse motor according to claim 1, wherein the second step includes injecting a molten brazing material into the opening of the magnetic plate and fixing it.