JPS622852A - Linear pulse motor - Google Patents

Abstract

PURPOSE:To simplify a structure for fitting a bearing and eliminate the limitation in the application range, by arranging a plane notch and a groove confronting to each other, on a mover and a stator respectively along the moving direction of the mover, and by arranging the guide bearing between the notch and the groove. CONSTITUTION:Either on the surface of a rod 1 on the side of a stator, or on a pole tooth section on the side of a mover 2, a plane notch 1b is formed in parallel with an axial center along the moving direction of the mover 2. On the other section, at the position confronting the plane notch, a groove 9a is formed along the moving direction of the mover 2 in the same way. Then, a bearing 11a is placed between the groove 9a and the plane notch 1b. As a result, a structure for fitting the bearing is simplified, and the mover 2 is not narrowly moved. Also, the mover 2 can be exactly prevented from being rotationally moved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a guide mechanism for a slider in a so-called cylindrical linear pulse motor that reciprocates a cylindrical slider along a rod-shaped fixed shaft.

[Prior art]

In general, linear pulse motors are widely used for precise positioning of driven parts in OA equipment such as typewriters, printers, and copiers because of their ability to provide accurate displacement to the moving element in response to input pulse signals. became.

In recent years, the application of cylindrical linear pulse motors has become more prominent in terms of ease of manufacturing and cost reduction, compared to so-called planar linear pulse motors that guide a slider using bearings along a planar scale. ing.

Incidentally, this type of cylindrical linear motor must guide the movable element along a rod-shaped fixed shaft and must accurately prevent rotation of the movable element.

Conventionally, as a means for this purpose, at least three bearing support members are provided at each end of the slider, and
A groove in which this bearing engages is formed along the guide direction of the slider of the rond stator.

[Problem that the invention seeks to solve]

The above-mentioned conventional cylindrical linear pulse motor has a complicated mechanism with a bare 1J song, which not only increases the manufacturing process, but also increases the length of the slider by the bearing support part, which in turn increases the need for certain secondary rod-type stators. In this case, the operating range of the mover is limited, and there is a risk that the applicable range will be limited.

[Means for solving problems]

The present invention provides a cylindrical linear pulse motor in which a notch is formed in one of at least two sets of opposing surfaces of a stator rod surface and a slider inner circumferential surface, and a groove is formed in the other. A bearing is interposed in a space surrounded by a notch and a groove.

[Operation] The bearing is located between opposing surfaces of the stator rod and the movable element that moves along the stator rod, and guides the movable element to the stator rod. On the other hand, this bearing fits into the space obtained by cutting out one side and forming grooves on the other side on the mutually opposing surfaces of the stator rod and the slider, so that the slider can be moved relative to the fixed rod. Rotation is precisely prevented.

〔Example〕

FIG. 1 is a partially cutaway cross-sectional view showing an embodiment of the present invention, and FIG.
The figure is a side view, and Figure 3 is an enlarged cross-sectional view of the main part of Figure 2. In each figure, 1 is a stator rod for a cylindrical linear pulse motor, and teeth 1a with a pitch width determined in the longitudinal direction are continuous. It is formed as follows.

lbt s lbz, 1b3 are notched surfaces, which are formed at equal intervals along the circumferential surface of the rod 1 in the longitudinal direction of the rod 1 and parallel to its axis. 2 is a moving element. The mover 2 has annular yokes 3a and 3ab located on both sides, and a yoke 4as4b having an angular cross section in the center. And yoke 3a,
4a forms an annular groove 5a, and yokes 3b and 4b form an annular groove 5b. 6 is an annular collar, which is attached to the yoke 4a.
, 4b are magnetically connected without any linkage. A permanent magnet 7 is interposed between the opposing outer surfaces of the yokes 4as4b and is connected to each yoke 4a.

The engaging surfaces to 4b are magnetized with opposite polarities o
3als 4al, 4bl, and 3bt are pole teeth of the mover 2, all of which are formed at the same pitch as the tooth portion 1a formed on the rod 1, and the pole teeth 3al, 4 are formed with respect to the tooth portion 1a.
b14al and 3bl are assembled in this order with a phase difference of 1/4 pitch. Fills 8a and 8b are annular and are fitted into the annular grooves 5a and 5b, respectively, and pulsed currents are supplied in a predetermined order and polarity through a power supply device (not shown) and a flexible electric wire. 9a.

9bq9c are grooves, which are the pole teeth 3al, 4al, of the mover 2;
In the portions 4bl and 3bl, the notches 1b1, 1b2, and 1b3 are formed in the rod 1, respectively. 10as, 10bs, and 10c are backing plates that are respectively fitted into the deepest parts of the grooves 9a, 9b, and 9c, and extend over the entire length along the loft 1 of the mover 2. 1la111bs11c is a linear bearing, each series of openings, -la 11a1.11bt, 1lc
holding frame 11a2.11b2.11c which is rotatably fitted loosely while maintaining the relative positions of the rollers 11a2.11b2.11c
It is equipped with 2. Also, this linear bearing 1la)
1lb111c are respectively guided by their holding frames 11a2.11b2.11c2 in the grooves 9as9bs9c, and the rollers 11a1 and Hbt% 1lcl loosely fitted into the holding frames 11a2.11b2.11c2 are transferred. That is, to explain the linear bearing lla as an example with reference to FIG. 3, the roller 11a1 is configured to be in line contact with the backing plate 10a and the notch lbl and roll as the slider 2 moves.

In the above configuration, if a pulse current is alternately supplied to the coils 8a and 8b through a power supply device (not shown) while reversing the polarity, each yoke 3, 1.3bs 4as 4bs
Among a plurality of magnetic circuits consisting of an empty 111iG with a stator rod 1 and a mover 2, the coil 8 receives a pulsed current.
Magnetic flux is generated in a closed magnetic circuit that interlinks with either one or both of a and 8b. Based on the interaction between this magnetic flux and the magnetic flux from the permanent magnet 7, one-phase excitation (coil 8aq8b
When only one of them is alternately excited, the pole teeth 3al, 4bl, and 4alq3bt of the mover 2 align with the tooth portion 1a of the rod 1 in this order, and take charge of the stepping motion by 1/4 pitch. On the other hand, in the two-phase excitation method, the operating state is the same as that of the one-phase excitation, but the stable point shifts by a constant pitch. In this way, in the process of moving the mover 2 along the rod 1, each roller 1lal s 1l of the linear bearing 1laqllbq11c
bl, 1lcl roll while contacting the surfaces of the backing plates 10a110b, 10c and the notches lbl, 1b2, 1b3 formed in the rod 1. Along with this, the linear bearings 1las 1lbSllc are adjusted to 1/1 of the displacement of the mover 2.
A displacement equivalent to 2 is performed. When the mover 2 moves along the rod 1 as described above (continuously visually), the linear bearing 1las 1lbs llc of the mover 2
Abutment plate 1θ located in the middle groove 9as 9bs 9c
a% 10b-i 100% and the notches 1a1, 1b2, lb3 of the rod 1 facing these are engaged in line contact to accurately prevent rotation.

[Other Examples]

FIG. 4 is a cutaway sectional view of main parts showing another embodiment of the present invention;
FIG. 5 is a side view, and FIG. 6 is an enlarged cross-sectional view of a main part. In each figure, the same parts as those shown in FIGS. 11 in Figures 4-6
'Nllb' and llc' are slide bearings that are fitted and fixed in grooves 9a19b, s9c formed in the mover 2, and the surface on the rod 1 side is in contact with the notches 1b111b2.1b3 formed in the rod 1.

These slide bearings 11a/, 11b', jlc'
The operating principle is the same for cylindrical linear pulse motors using slide bearings, but they are suitable when the load on the motor is relatively small and high positioning accuracy is not required. , the most suitable material is resin.

[Scope of application of the invention]

The present invention is not limited to the configurations shown in the above two embodiments, and various forms may be considered. That is, (1) the bearings shown in each embodiment can be mixed and used in one linear pulse motor (the number of repair rings is not limited to three, but can generally be multiple).

However, in the case of two, consideration must be given to making the surface of the notch slightly curved in order to obtain an alignment effect.

(There is an embodiment in which ten notches are formed on the mover side and a groove is formed on the stator rod.

〔effect〕

As described above, the cylindrical linear pulse motor according to the present invention has a fixing rod (the meaning of this stator is taken into consideration with the secondary side as the reference for the fixed state, for example, the movable element according to the present invention is fixed). A plurality of notches are formed along the movable direction of the movable element on either one of the movable element (which also includes a mode in which the secondary side is moved) and the movable element which receives a step movement along this, and the above-mentioned notches on the other side are formed. A groove is formed in a portion facing the notch, a bearing is placed in the groove, and the outer end surface of the bearing engages with the facing notch surface. Based on this configuration, the anti-rotation guide mechanism of the slider for a cylindrical linear pulse motor is carried out only by the formation of grooves and notches that hold the bearings. Since there is no need for a special mechanism to hold the bearings, the structure is simplified and costs are reduced accordingly, and there is no room for increasing the length of the slider in the moving direction due to the slider guide mechanism, which limits the mounting locations. The movable range of the movable member is larger than that of the conventional method for a given rod length, making it less susceptible to limitations in the applicable range.

[Brief explanation of the drawing]

FIG. 1, FIG. 2, and FIG. 3 are a longitudinal sectional view, a side view, and a sectional view of essential parts, respectively, showing an embodiment of the present invention. FIG. 4, FIG. 5, and FIG. S are a longitudinal sectional view, a side view, and a sectional view of essential parts, respectively, showing other embodiments of the present invention.

Claims (1)

[Claims] 1. A linear pulse motor having the configuration described in each of the following items (a) A rod is provided on either the stator-side rod surface or the slider-side pole tooth portion along the moving direction of the slider. A planar notch (b) formed parallel to the axis; a groove (c) formed opposite to the notch on the side of the rod surface on the stator side and the pole tooth portion on the movable side where the notch is not formed; a bearing 2 disposed in the groove for guiding the slider along the rod while preventing rotation of the slider based on engagement with the notch; The linear pulse motor 3 according to claim 1, comprising a support frame that is loosely fitted while maintaining relative positions, and the linear pulse motor according to claim 1, wherein the bearing is a slide bearing.