JPH019266Y2 - - Google Patents

Description

[Detailed explanation of the idea] Technical field This invention relates to a flat motor.

Prior Art Conventional flat motor 1 that rotates the type wheel of an electronic typewriter to select type.
Referring to FIG. 1, a flat, annular magnet 3 made of ferrite is fixed to the inner surface of a flat magnetic bracket 2. As shown in FIG. A magnetic bracket 4 drawn into the shape of a flat and substantially covered cylinder so as to cover the magnet 3 is fixed to the bracket 2 at a flange portion 4a on its periphery, and a coupling hole 5 is formed through the flange portion 4a and the bracket 2. is provided. A predetermined gap G is provided between the lid portion 4b of the bracket 4 and the magnet 3, and the lid portion 4
A cylindrical bearing portion 4c with a lid facing outward is integrally formed at the center of b. A rotary shaft 7 is rotatably supported between the brackets 2 and 4 by a pair of bearings 6, and a flat ironless rotor 8 located between the magnet 3 and the bracket 4 is fixed to the rotary shaft 7. ing. Further, a commutator 9 is fixed to the rotating shaft 7 on the side surface of the rotor 8 opposite to the magnet 3, and in order to maintain insulation between the commutator 9 and the bearing portion 4c of the bracket 4, the inner circumference of the bearing portion 4c is fixed. A cylindrical insulator 10 made of synthetic resin is fixed to the surface.

In this conventional flat motor 1, since the bracket 4 is drawn, it is difficult to improve the precision of flatness etc.
It was not possible to obtain high dimensional accuracy for the gap between the motor and the motor, and the characteristics of the motor had a great influence. That is, the magnet 3 is magnetized in the thickness direction of the bracket 2, and when the rotor 8 is excited, the N pole of the magnet 3 on the lid 4b side, the rotor 8, the lid 4b of the bracket 4, and the lid of the magnet 3 are magnetized. A magnetic flux φ flows through a magnetic path leading to the S pole on the side of the portion 4b, the N pole in contact with the bracket 2 on the opposite side, the bracket 2, and the S pole in contact with the bracket 2. Therefore, the gap G constitutes a part of the magnetic path, and the size of the gap G greatly influences the characteristics of the flat motor 1. Moreover, when the gap G becomes narrower, the rotor 8
There were even cases where the rotor 8 came into contact with the magnet 3 or the bracket 4 and became unable to rotate. Further, in the bracket 4, which requires such precision, it has not been possible to integrally form component mounting portions of various shapes because it is very difficult to manufacture and increases the manufacturing cost.

Purpose The purpose of this invention is to improve the dimensional accuracy of the gap between the magnet and the bracket, make the characteristics of the flat motor uniform, and
To provide a flat motor in which the rotor does not become unrotatable due to contact with magnets or brackets, and in which component mounting parts of various shapes can be integrally formed extremely easily.

Embodiment An embodiment embodying this invention will be described below with reference to FIGS. 2 to 4.
1 is constructed as follows.

The outer peripheral edge of the flat magnetic bracket 22 has 3
The fixed pieces 22a are integrally provided, and each fixed piece 2
Insertion holes 23 are transparently provided in each of the holes 2a.
A flat annular magnet 24 made of ferrite is fixed to the inner surface of the bracket 22, and the magnet 24 is magnetized with four poles in the thickness direction of the bracket 22. Three spacers 26 are provided protruding from the outer periphery of the inner surface of the flat magnetic bracket 25, and a small-diameter male screw 26a is threaded at the tip of each spacer 26. By inserting the male screw 26a into the insertion hole 23 and tightening it with the nut 27, both the brackets 22, 25 are arranged substantially parallel to each other with a distance between them, and the magnet 24 is attached to both the brackets 22, 25.
located between. Also, the magnet 24 and the bracket 25
A gap G is formed between them. bracket 25
A center hole 28 with a larger diameter than a commutator 35 (to be described later) is provided in the center of the bracket 25, and a substantially covered cylindrical hole made of synthetic resin is secured to the outer surface of the bracket 25 by bolts 29 so as to cover the center hole 28. An insulator 30 is fixed at its flange portion 30a. A bearing 31 is fixed to the center of the bracket 22, a bearing 32 is attached to the center of the insulator 30, and a flat disc-shaped blank located within the gap G is connected between the bearings 31 and 32 by a rotating shaft 33. An iron core rotor 34 is rotatably supported. The rotor 34 has three coils 34a insulated and molded with epoxy resin 34b, and the rotor 34 on the opposite side from the magnet 24
A commutator 35 to which the coil 34a is connected is fixed to the rotating shaft 33 on the side surface. A pair of notches 36 are formed in the insulator 30 for inserting brushes (not shown) that come into contact with the commutator 35. In addition, in order to eliminate play in the axial direction of the rotor 34, the rotor 3 on the opposite side of the magnet 24 is
A biasing plate 37 made of a magnetic material that is attracted to the magnet 24 is adhered to the four sides.

A coupling portion 38 is formed integrally with one edge of the bracket 25 toward the side opposite to the bracket 22, and the coupling portion 38 has two coupling holes 38a, 3.
8a is provided transparently. Further, a coupling groove 38b extending vertically is provided on the upper edge of the coupling portion 38, and a mounting piece 39 is bent outward, and a mounting recess 39a for mounting a tension spring is formed in the mounting piece 39. ing. Also, bracket 25
On the other side edge, a connecting portion 40 is integrally bent toward the side opposite to the bracket 22, and the connecting portion 4
In case 0, one coupling hole 40a is transparently provided. A coupling groove 4 extending vertically is provided at the upper edge of the coupling part 40.
0b, and a support piece 4 is provided at the bottom of the joint 40.
1 is bent outward. Furthermore, bracket 2
5, other joint parts 42 and 43 are integrally bent toward the bracket 2 side, and both joint parts 4
Female screw holes 42a and 43a are formed in 2 and 43, respectively. A gap is formed between these joint parts 42, 43 and the bracket 22,
Both 22, 42, and 43 are not in contact with each other. The coupling groove 38b of the coupling part 38 and the coupling groove 4 of the coupling part 40
0b, the mounting piece 39, and the coupling parts 42 and 43 constitute a component mounting part.

Therefore, the area between the brackets 22 and 25 is open, and the flat motor 21 has good ventilation between the inside and the outside, and there is little temperature rise due to heat generated by the coil 34a. Also, the bearing 3 is placed on the insulator 30.
2, the bearing part, that is, the rotor 3
There is no need for special insulation treatment between 4 and the bracket.

Now, the flat motor 21 of this embodiment is installed in an electronic typewriter in the following manner. Typewriter platen 44 as shown in FIG.
A carriage 46 serving as a motor support body is supported horizontally movably on a guide shaft 45 extending parallel to the motor, and the flat motor 21 of this embodiment is positioned on the carriage 46 by a support piece 41.
The three coupling holes 38a, 38a, and 40a are coupled and fixed by bolts, nuts, or the like. At one end of the rotating shaft 33 protruding from the bracket 22, there is a type wheel 4 facing the printing paper S on the platen 44.
7 is fixed, and letters 49 are provided at the tips of a number of radial spoke portions 48, respectively. A ribbon 5 is placed between the printing paper S and the type 49.
0 is provided so as to be movable up and down. Two bolts 51 are attached to the connecting parts 42 and 43 of the flat motor 21.
A support body 52 is fixed, and a hammer solenoid 53 is fixed to the upper end of the support body 52, and the hammer 53a faces the back surface of the type 49. Rotating shaft 33 protruding from bracket 25
An encoder 54 is attached to the other end, and a protrusion 54a provided on the encoder 54 is fitted into the two coupling grooves 38b and 40b.
An encoder 54 is supported by the flat motor 21.

Then, the flat motor 21 is rotated, and the desired type 49 is selected so as to face the printing paper S. Subsequently, the ribbon 50 is moved upward to face the type portion of the printing paper S, and the hammer solenoid 5 is activated.
3 is activated, the hammer 53a hits the back surface of the printing type 49, and a predetermined print is made on the printing paper S.

The flat motor 21 of this embodiment used as described above has two flat brackets 22 and 25 that are not drawn and are arranged approximately parallel to each other with a space between them, and the connecting portions 38, 40, 42, 43. is formed by bending the peripheral edge portion of the bracket 25, so that the flat plate portion of the bracket 25 is not deformed and the dimension of the gap G between the bracket 25 and the magnet 24 is not changed, and the rotor 34 is able to move around the magnet 24. or the rotor 34 without contacting the bracket 25.
It is impossible for the motor to become unable to rotate. Furthermore, since the two magnetic brackets 22, 25 are directly connected via a spacer 26 formed separately from these, the respective magnetic brackets 22, 25 have extremely high flatness, etc. In particular, the magnet 2 fixed to the flat magnetic bracket 22
4 and the other flat magnetic bracket 25 can be improved in dimensional accuracy, and the characteristics of the flat motor 21 can be made uniform. Further, since one side of the rotor 34 is supported by the insulator 30, there is no need to perform special insulation treatment between the rotor 34 and the bracket 25 to which the insulator 30 is fixed. Moreover, since this flat motor 21 is connected to the carriage 46, hammer solenoid 53, etc. through the connecting parts 38, 40, 42, 43, etc., the connecting parts 38, 40, 4
2 and 43 may be slightly deformed, the flat plate portion of the bracket 25 facing the rotor 34 will hardly be deformed, and the gap G with high dimensional accuracy can be maintained.
can be maintained. Furthermore, the connecting portions 38, 40, 42, and 43 can be integrally formed by bending the peripheral edge of the flat plate-shaped bracket 25 punched out with a press, which makes manufacturing extremely easy and has a simple structure. is easy. Further, other parts such as the hammer solenoid 53 and the encoder 54 can be directly assembled to the flat motor 21 without requiring any special intervening members for attachment.

Note that the connecting portions 38, 40, 42, 43, etc. may be formed integrally by bending the peripheral edge portion of the bracket 22, or may be formed integrally by bending the peripheral edge portions of both brackets 22, 25. Good too.

Effects As detailed above, this invention consists of two magnetic brackets 22 and 25 that are spaced apart and arranged substantially parallel to each other, and that the two magnetic brackets 22 and 25 are magnetized in the thickness direction of the brackets 22 and 25. bracket 22,
25 and one bracket 22
A flat motor equipped with a magnet 24 fixed to a magnet 24, and a flat ironless rotor 34 located between the other bracket 25 and the magnet 24 and rotatably supported by the two brackets 22, 25. , the two magnetic brackets 22, 2
5 are each formed into a flat plate shape, and both magnetic brackets 22 and 25 are directly connected via a spacer 26 formed separately from these, and the other bracket 25 is provided with a commutator of the rotor 34. 35 is inserted through the central hole 28, and
An insulator 30 covering the commutator 35 is fixed in the center hole 28, and the insulator 30 and the one bracket 22 rotatably support the ironless rotor 34. Component mounting portions 38, 39, 40, 42, 4 are formed by bending the peripheral edge portions of both or one of the body brackets 22, 25.
3 is integrally formed, the dimensional accuracy of the gap G between the magnet 24 and the bracket 25 can be improved with a simple structure, and the characteristics of the flat motor 21 can be made uniform.
There is no risk that the magnet 24 or the bracket 25 will come into contact with the bracket 25 and become unrotatable, and the flat bracket 2
Since the component mounting parts 38, 39, 40, 42, and 43 can be integrally formed by bending the peripheral edge portions of both or one of the parts 2 and 25, manufacturing is extremely easy and can be performed at low cost. Furthermore, other parts such as the hammer solenoid 53 and the encoder 54 can be mounted on the flat motor 2 without requiring special intervening members for mounting them, for example, as in the above embodiment.
1 can be directly assembled and has the effect of simplifying the structure as a whole.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing a conventional flat motor.
Figures 2 to 4 show an embodiment of a flat motor embodying this idea, with Figure 2 being a sectional view and Figure 3 being a cross-sectional view.
The figure is an exploded perspective view, and FIG. 4 is a side view showing how to use it. 21... Flat motor, 22... Bracket, 24... Magnet, 25... Bracket, 26...
... Spacer, 28 ... Center hole, 30 ... Insulator,
34... Rotor, 35... Commutator, 38, 40,
42, 43...Joint part, G...Gap.

Claims (1)

[Claims for Utility Model Registration] Two magnetic brackets 22 and 25 arranged at intervals and substantially parallel to each other, and the bracket 2
A magnet 24 magnetized in the thickness direction of the plates 2 and 25 and located between the two brackets 22 and 25 and fixed to one bracket 22, and a magnet 24 located between the other bracket 25 and the magnet 24. death,
In the flat motor including a flat coreless rotor 34 rotatably supported by the two brackets 22, 25, the two magnetic brackets 22, 25 are each formed into a flat plate shape, and both The magnetic brackets 22 and 25 are directly connected via a spacer 26 formed separately from these, and the other bracket 25 is provided with a center hole 28 through which the commutator 35 of the rotor 34 is inserted. An insulator 30 covering the commutator 35 is fixed to the center hole 28, and this insulator 30 and the one bracket 2
2 rotatably supports the iron coreless rotor 34, and both flat magnetic brackets 2
1. A flat motor characterized in that component attachment parts 38, 39, 40, 42, and 43 are integrally formed by bending the peripheral edge portions of both or one of parts 2 and 25.