JPH09149624A - Linear stepping motor for fiber knitting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep constant the pitch and intervals between the stationary teeth of a rail and the small teeth of a movable body by causing a united core body to have both core parts, and inserting a magnet into a through hole formed at the center of the core body. SOLUTION: A movable body 4 having four wheels 3 for traveling on each rail part is provided freely-movably above a rail 1, and this movable body 4 has a core body 8 composed of a large number of core pieces each punched into a body and laminated, and has a through hole and a pair of constricted parts 6, 7 in the center. This core body 8 has first and second core parts 8a, 8b formed on the left and right of this through hole 5 symmetrically. Individual core pieces of the core body 8 are glued and laminated with an adhesive agent interposed between, and in this state the underside of each moving tooth 9 is ground into a plane, and individual undersides are arranged on the same plane. And a platelike magnet 15 of a rare-earth such as samarium cobalt etc., is inserted into the through hole 5. Consequently, it becomes possible to achieve high-precision step drive.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear stepping motor for a fiber knitting machine, and in particular, a pair of cores having coils is integrally formed by laminating integrally punched core pieces, and is movable with fixed teeth of a rail. The present invention relates to a new improvement for keeping a constant distance and pitch from a moving tooth of a body.

[0002]

2. Description of the Related Art Conventionally used linear stepping motors of this type generally include a pair of cores integrated with an adhesive and a magnet sandwiched between the cores.

[0003]

Since the conventional linear step motor is constructed as described above, there are the following problems. That is, since each core has a pair of magnetic poles, the pitch accuracy of each magnetic pole when the cores are adhered varies depending on the assembling method.
In addition, the distance between the small teeth on the bottom of each core and the fixed teeth on the rail is extremely small, on the order of several tens of microns. It was difficult to complete the alignment in the directions, and this interval varied among the cores, making it difficult to achieve smooth movement.

The present invention has been made to solve the above problems, and in particular, a pair of cores having respective coils is integrally formed by laminating integrally punched core pieces, and the rail is fixed. An object of the present invention is to provide a linear step motor for a fiber knitting machine in which a pitch and a gap between teeth and small teeth of a movable body are kept constant.

[0005]

A linear stepping motor for a fiber knitting machine according to the present invention comprises a rail having a large number of fixed teeth on its upper portion, a wheel running on the rail, and a plurality of small teeth on its lower portion. A movable body having a first core portion and a second core portion, a first coil wound around the first core portion, and a second coil wound around the second core portion, In the linear stepping motor for a fiber knitting machine, which is configured to move the movable body by selective excitation to each coil, each core portion is made of an integrally formed core body, and is formed at the center of the core body. The magnet is fitted in the through hole.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a linear step motor for a fiber knitting machine according to the present invention will be described in detail below with reference to the drawings. In FIG. 1 and FIG. 2, reference numeral 1 denotes a rail having a plurality of fixed teeth 2 on its upper portion, and a pair of linear rail portions 1a and 1b are formed on both sides of the rail 1. On this rail 1,
A movable body 4 having four wheels 3 traveling on each rail portion 1a, 1b is movably provided. The movable body 4 has a large number of integrally punched core pieces 8A laminated and penetrates in the center thereof. A core body 8 having a hole 5 and a pair of constricted portions 6 and 7 is provided. The core body 8 has first and second core portions 8a and 8b formed on the left and right with the through hole 5 as the center.
Each of the core portions 8a and 8b of the core body 8 includes first, second, third, and fourth magnetic poles 10, 11, 12, and 13 each having a plurality of small teeth 9, as shown particularly in FIG. Have. A knitting needle (not shown) for embroidery is attached to the movable body 4 to knit fibers.

Although not shown, each core piece 8A of the core body 8 is bonded and laminated between the core pieces 8A via an adhesive, and the lower surface of each moving tooth 9 is polished in this state. Each lower surface is aligned on the same surface. The fixed teeth 2 are formed in the same manner as the small teeth 9, and the upper surface is polished. A plate-shaped magnet 15 made of a rare earth such as samarium cobalt is fitted into the through hole 5. Shaft holes 20 and 21 are formed at outer end positions of the first core 8a and the second core 8b, respectively.
Shafts 22 and 23 made of a non-magnetic material are directly inserted into the shafts, and bearings are rotatably provided on the flanged shafts 22 and 23 as the wheels 3 at both ends of the shafts 22 and 23.

[0008] The first, formed on each of the cores 8a, 8b,
A first coil 28 and a second coil 29 are wound around the second recesses 25 and 26 via a bobbin 27,
The recesses 0, 11, 12, and 13 are spaced apart from each other by the recesses 25 and 26 and the recess 30 formed between the magnetic poles 11 and 12. As shown in FIG. 7, the small teeth 9 in each of the magnetic poles 10 to 13 are で between the magnetic poles 10 and 11.
Pitch, similarly, there is a 1/2 pitch deviation between the magnetic poles 12 and 13, and 1 / between the magnetic poles 10, 11 and 12, 13.
It is formed shifted by four pitches.

Next, the operation will be described. First, as is well known, by selectively applying an exciting current to the coils 28 and 29 as shown in states 0 to I to II to III of FIG. The magnetic path between each small tooth 9 and the fixed tooth 2 of the rail 1 changes in a known manner, and the core body 8
The movable body 4 having the step moves stepwise by a predetermined amount as the wheels 3 rotate. As described above, this movable body 4
By attaching a knitting needle (not shown) to and knitting with a knitting machine, for example, embroidery can be performed. In addition, the thrust acting on the movable body 4 during the operation shown in FIG. 8 in the linear stepping motor having the above-described structure is shown by reference from the well-known equations (1) to (4) according to the following equations 1 and 2. Can be represented.

[0010]

(Equation 1)

[0011]

(Equation 2)

[0012]

Since the linear step motor for a fiber knitting machine according to the present invention is constructed as described above, the following effects can be obtained. That is, since each core constituting the core body of the movable body is formed of an integrated laminated plate,
The lower teeth of the lower part of each core are completely flush with each other, and the intervals between the fixed teeth, which have very small intervals, are the same for each core, and the strength of the magnetic path on the magnetic circuit is also uniform. A precision step drive can be achieved. Further, since the core body is integrated, the pitch accuracy of each magnetic pole position is improved, and highly accurate positioning is possible.

[Brief description of the drawings]

FIG. 1 is a front view showing a linear step motor for a fiber knitting machine according to the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a side sectional view of FIG. 1;

FIG. 4 is an enlarged perspective view of a main part of FIG.

FIG. 5 is a front view showing the core body of FIG. 4;

FIG. 6 is a plan view of FIG. 5;

FIG. 7 is a structural principle diagram of FIG. 1;

8 is an operation principle diagram of FIG. 7;

[Explanation of symbols]

 Reference Signs List 1 rail 2 fixed teeth 3 wheel 4 movable body 5 through hole 8 core body 8a, 8b core part 9 small tooth 15 magnet 28, 29 coil

Claims (1)

[Claims] 1. Rail having a large number of fixed teeth (2) at the top
(1) and a first core part (8a) and a second core part (8b) having wheels (3) running on the rail (1) and having a plurality of moving teeth (9) in a lower part. A movable body (4), a first coil (28) wound around the first core portion (8a), and a second coil (29) wound around the second core portion (8b). Each coil (28,
In the linear step motor for the fiber knitting machine, in which the movable body (4) is moved by selective excitation to (29), each of the core portions (8a, 8b) is formed of an integrally formed core body (8). A linear step motor for a fiber knitting machine, wherein a magnet (15) is inserted into a through hole (5) formed in the center of the core body (8).