JPH0156632B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention provides a magnetic pole of a primary magnetic flux generating device in which pole teeth are arranged at a predetermined pitch by stacking a slit plate on a plate-shaped magnetic pole member. The present invention relates to a linear pulse motor made of

[Prior art and its problems]

Linear pulse motors can achieve high performance as reciprocating actuators, so they are used in a variety of information terminal equipment, such as head feeding in various printers and photoelectric reading devices, which require accurate positioning control. However, in recent years, office automation equipment has become increasingly smaller and thinner, and along with this trend, there has been an increasing demand for smaller and thinner linear pulse motors. ing.

In view of such requests, the applicant has submitted the fourth
Linear pulse motors as shown in Figures 7 to 7 have been developed.

This linear pulse motor has four magnetic poles 1a,
Primary side magnetic flux generator 1 having 1b, 1c, 1d
and a secondary scale 2 linearly movably supported on the magnetic flux generating device 1, and a predetermined pulse signal is input to the two excitation coils 3a and 3b of the magnetic flux generating device 1 to Magnetic poles 1a, 1b, 1
A magnetic attraction force is generated between the pole teeth formed on the poles c and 1d and the teeth formed on the secondary scale 2, and the magnetic attraction force causes one of the magnetic flux generating device 1 or the secondary scale 2 to remain constant. The driving principle is the same as the previous one, but as is clear from FIG. Each plate-shaped magnetic pole member 4, 5, 6, 7 has a head 4a, 5a, 6a, 7a on which a pole tooth 8 is provided, and a head 4a, 5.
Extending from the excitation coils 3a, 6a, 7a,
Legs 4b, 5 to which the magnetic frame 9 wrapped around 3b is fixed.
b, 6b, and 7b to form a substantially L-shape;
The magnetic pole members 4, 5, 6, 7 are arranged in a planar shape with their heads 4a, 5a, 6a, 7a close to each other and in a substantially H-shape, and the opposing legs 4
Excitation coils 3a, 3b between b, 5b, 6b, 7b
The pole teeth 8 that generate magnetic flux are formed by bonding a slit plate 10 having slits 10a at predetermined intervals to the surfaces of the plate-shaped magnetic pole members 4, 5, 6, and 7. bonding a permanent magnet 11 having a predetermined polarity to the back surface of the plate-shaped magnetic pole members 4, 5, 6, 7 so as to span each magnetic pole 1a, 1b, 1c, 1d; These characteristic configurations are essential, and these essential configurations make it possible to achieve a thinner design.

In addition, when manufacturing the magnetic flux generating device 1 as described above, the four magnetic pole members 4, 5, 6, 7
As shown in FIG. 8, the four magnetic pole members 4, 5, 6, and 7 are formed in advance as a yoke (connecting pole) 12 of an integral structure that is connected in a predetermined positional relationship when actually assembled. On the other hand, the slit plate 10 that forms the pole teeth 8 on the upper surface of the head of each magnetic pole member 4, 5, 6, and 7 has an integral structure with slits 10a provided at four locations at a predetermined pitch corresponding to the yoke 12. Form it. After the yoke 12 and the slit plate 10 are bonded to the permanent magnet 11, unnecessary connecting portions 10b and 12a are cut off as shown by broken lines in FIGS. 9A and 9B. According to such a manufacturing method, the mutual positioning of the magnetic pole members 4, 5, 6, and 7 can be easily and reliably performed.

Furthermore, the above-mentioned linear pulse motor has a fourth
As shown in FIG. 5 and FIG. 5, the gap between the slit plate 10 and the secondary scale 2 is maintained by the rollers 13, and the secondary scale 2 is moved in the stepping direction by the balls 14. A retainer 15 (movable member) that holds these rollers 13 and balls 14 and is fixed to the secondary scale 2 is positioned movably in the walking direction by a guide member 16. There is.

By the way, such a linear pulse motor is
In order to prevent the secondary scale 2 from falling off, it is necessary to mechanically limit the amount of movement of the secondary scale 2 with respect to the primary magnetic flux generator 1. Particularly when applied to a portable device, there is a high possibility that the secondary scale 2 will move significantly due to tilting or impact when the device is carried, so the rollers 13 and balls 14 that support and guide it are used as guide members. 16
It is essential to prevent the secondary scale 2 from coming off and falling off.

For this reason, conventionally, as shown in FIG. 4, a component of the primary magnetic flux generator 1 (such as a back plate 17) is provided with a protruding part, and the secondary scale 2 is brought into contact with the retainer 15. Stopper 18a, 1 that regulates the amount of movement and prevents it from falling off.
8b was provided. And this stopper 1
The maximum movement amount of the secondary scale 2 determined by 8 (hereinafter referred to as "allowable displacement amount") needs to be set to a predetermined value in relation to the specifications of the linear pulse motor. It was adjusted by position.

However, conventionally the stoppers 18a, 18
b was previously manufactured separately from other parts and fixed in a predetermined position by mounting during assembly. Therefore, the number of parts constituting the primary side magnetic flux generating device 1 increases, resulting in high processing costs, and in order to increase the adhesive strength of the stoppers 18a and 18b, a predetermined adhesive area must be secured, and the adhesive area The permissible displacement amount may be sacrificed in order to ensure the
There are problems in that it is difficult to shorten the assembly work time due to the labor required for positioning b and the time required for drying the adhesive, and solving these problems has been an issue for the future.

[Purpose of the invention]

This invention was made in view of the above circumstances,
A stopper can be formed to set the allowable displacement without the need for time-consuming gluing or positioning work.
Moreover, it is an object of the present invention to provide a linear pulse motor that can reduce the number of component parts of the primary side magnetic flux generator, improve assembly workability, and reduce manufacturing costs.

[Structure of the invention]

The linear pulse motor of the present invention has a primary side magnetic flux generating device in which a magnetic pole having pole teeth at a predetermined pitch is formed by stacking a slit plate in which slits are arranged at a predetermined pitch on a plate-shaped magnetic pole member. , is disposed facing the slit plate, is supported movably in the direction in which the pole teeth are arranged with respect to the primary side magnetic flux generating device, and has teeth arranged at a constant pitch on a surface facing the pole teeth. The linear pulse motor is provided with a secondary scale, and advances one of the primary magnetic flux generator or the secondary scale by a fixed distance by a magnetic attraction force acting between the pole teeth. The slit plate is integrally provided with a bent piece that projects into the orbit of the secondary scale or a movable member fixedly attached to the secondary scale by bending the plate. It is characterized in that the amount of movement of the secondary scale relative to the primary magnetic flux generating device is limited by the bending piece coming into contact with the secondary scale or the movable member.

[Embodiments of the invention]

FIG. 1 is a plan view of a linear pulse motor which is an embodiment of the present invention, and FIG. 2 shows a slit plate 20 used in this embodiment.

This slit plate 20, like the slit plate 10 shown in FIG. The illustrated slits 10a and the four plate members 10 in which these slits 10a are formed
The slits 10a are arranged in the direction in which the slits 10a are arranged (the secondary scale 2 or the primary magnetic flux generator 1 moves forward) in each plate member 10c. The bent pieces 21 are integrally formed and spaced apart in the vertical direction (in FIG. 2).

By bending these bent pieces 21 at right angles to the plate member 10c, the retainer 15 (movable By protruding into the orbit of the member) and coming into contact with this retainer 15, it becomes a stopper that sets the movable range of the secondary scale 2, and changes the position of the retainer 15 and the secondary scale 2 and the primary magnetic flux. The dimensions of each part are set in consideration of gaps between the generator 1 and the generator 1.

Since the slit plate is usually made of a thin plate material of about 0.3 mm, the bent piece 21 as described above can be easily formed at the same time as the slit 10a by processing means such as press working or etching. Furthermore, if the bent piece 21 serving as a stopper is provided integrally with the slit plate 20 in this way, the stopper for setting the allowable displacement amount of the linear pulse motor can be formed simply by folding the bent piece 21 during assembly. All you have to do is bend it, and it can be done without the need for time-consuming gluing or positioning work. Therefore, it is no longer necessary to sacrifice the allowable displacement amount in order to secure the bonding area, and the number of component parts of the primary magnetic flux generator 1 is reduced, which greatly reduces the assembly work. It has been simplified, improving assembly workability and reducing manufacturing costs.

Note that the slit plate 20 of the above-mentioned embodiment is a plate member 10 stacked on the plate-shaped magnetic pole members 4, 5, 6, and 7.
A notch was made in c to form the bent piece 21, but
As shown in FIG. 3, it may be provided so as to protrude from the plate member 10c.

〔Effect of the invention〕

As explained above, in the linear pulse motor according to the present invention, the bent piece is integrally formed with the slit plate which is stacked on the plate-shaped magnetic pole member to form the magnetic pole of the primary magnetic flux generator. By bending the bent piece, a stopper can be obtained that sets the movement range of the secondary scale located on the slit plate (that is, the allowable displacement amount of the linear pulse motor), and when forming the stopper, No time-consuming installation or positioning work is required. Therefore, compared to conventional linear pulse motors in which the stopper is formed as a separate member and adhered to the component parts of the primary magnetic flux generator during assembly, the number of component parts of the primary magnetic flux generator is reduced and assembly is easier. This simplifies the work, improves assembly workability, and reduces manufacturing costs. Furthermore, the permissible displacement amount is no longer sacrificed in order to secure the adhesion area of the stopper.

[Brief explanation of drawings]

FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a plan view of a slit plate used in the above embodiment, and FIG.
The figure is a plan view showing another embodiment of the slit plate,
Figures 4 to 7 are explanatory diagrams of conventional linear pulse motors, with Figure 4 being a plan view, Figure 5 being a front view, and Figure 6 being a front view.
The figure is a partially sectional right side view, FIG. 7 is an exploded perspective view, and FIGS. 8 and 9A and 9B are explanatory views of a conventional slit plate and yoke, respectively. 1... Primary side magnetic flux generator, 2... Secondary side scale, 3a, 3b... Excitation coil, 4, 5, 6,
7...Plate magnetic pole members, 4a, 5a, 6a, 7a...
...Head, 4b, 5b, 6b, 7b...Legs, 8...
...Pole tooth, 9...Magnetic frame, 10a...Slit, 1
0c... Plate member, 11... Permanent magnet, 15... Retainer, 16... Guide member, 20... Slit plate, 21... Bent piece.

Claims (1)

[Scope of Claims] 1. A primary magnetic flux generating device in which a magnetic pole having pole teeth at a predetermined pitch is formed by stacking a slit plate in which slits are arranged at a predetermined pitch on a plate-shaped magnetic pole member; It is disposed opposite to the slit plate, is supported movably in the direction in which the pole teeth are arranged with respect to the primary side magnetic flux generator, and has teeth arranged at a constant pitch on a surface facing the pole teeth. A linear pulse motor is provided with a secondary scale, and advances one of the primary magnetic flux generator or the secondary scale by a fixed distance by a magnetic attraction force acting between the pole teeth. , the slit plate is integrally provided with a bending piece that projects into the orbit of the secondary scale or a movable member fixedly attached to the secondary scale by bending the plate; A linear pulse motor characterized in that the movement of the secondary scale relative to the primary magnetic flux generator is limited by the curved piece coming into contact with the secondary scale or the movable member.