JPH09163716A - Fiber knitting machine stepping motor and its driving method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To move pattern system guide pins variably and cope with the arbitrary variety of design patterns by a method wherein the tooth pitch of a linear stepping motor is selected to be one of specific values and the movement pitch of the pattern system guide pins provided on a mover is selected to be one of specific values. SOLUTION: A rail 1 which has a number of fixed teeth 2 on its upper part and a mover 4 which has wheels 3 for travelling on the rail 1 and has a first core part 8a and a second core part 8b which have a plurality of small teeth 9 on their lower parts are provided. A first coil 28 is wound on the first core 8a and a second coil 29 is wound on the second core 8b and the respective coils 28 and 29 are selectively excited to move the mover 4. Further, the tooth pitches of the fixed teeth 2 and the small teeth 9 are selected among 1/9", 1/18" and 1/36" and the mover 4 is moved with a moving pitch of 1/18" or 1/24".

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 a driving method, and more particularly to at least one linear stepping motor for a fiber knitting machine.
The present invention relates to a new improvement for variably moving a handle thread guide pin at a pitch of / 18 inch or 1/24 inch.

[0002]

2. Description of the Related Art In a fiber knitting machine of this type which has been conventionally used, a knitted fabric (article) is produced by crossing a large number of yarn groups called warp yarns or ground yarns with a weft or knitting yarn ) And knitting (cloth) are made. The thread spacing of this warp or ground thread is called an inch system, and as a typical dimension,
The intervals of 1/18 inch (1.411 mm) and 1/24 inch (1.058 mm) are frequently used, and this knitting machine has the necessary number of pattern threads for the ground threads arranged at this interval. The yarn guide pin is guided to the ground yarn by moving at the above-mentioned interval, and the knitting pattern is formed by intersecting the arbitrary yarn and the pattern yarn. Therefore, in the conventional knitting machine, the handle yarn guide pin is driven by the mechanical cam structure with a minimum moving unit amount of 1/18 inch or 1/24 inch.

[0003]

Since the structure for moving the handle thread guide pin in the conventional knitting machine is a mechanical cam structure, the interval set once, that is, the amount of movement cannot be changed, and thus it is produced. The design of the knit was also a single repetitive motion. Therefore, it was completely impossible to meet the needs of arbitrary variety of designs.

The present invention has been made to solve the above problems, and in particular, a pitch of at least 1/18 inch or 1/24 inch is obtained by using only one linear step motor for a fiber knitting machine. It is an object of the present invention to provide a linear step motor for a fiber knitting machine and a driving method in which the handle yarn guide pin is variably moved.

[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 a linear step motor for a fiber knitting machine in which the movable body is moved by selectively exciting each coil, the tooth pitch of the fixed teeth and the small teeth is 1/9, 1/18, 1/2.
7 or 1/36 inch, and the movable body is 1/1
It is configured to move at a movement pitch of 8 inches or 1/24 inches.

In the method for driving a fiber knitting machine according to the present invention, a rail having a large number of fixed teeth on the upper portion, a wheel running on the rail, and a plurality of small teeth on the lower portion of the first core portion and the second core portion. A movable body having a core portion, a first coil wound around the first core portion, and a second coil wound around the second core portion, and are selectively excited by the coils. The pattern yarn guide pin is driven by using the linear step motor for the fiber knitting machine configured to move the movable body, and at the same time, the drive pulse of one linear step motor for the fiber knitting machine is changed to thereby change the pattern yarn guide. This is a method of changing the movement pitch of the pins to at least 1/18 inch or 1/24 inch.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a linear step motor for a fiber knitting machine and a driving method according to the present invention will be described in detail below with reference to the drawings. First, a linear step motor for a fiber knitting machine used in the present invention will be described with reference to FIGS. 1 to 8. 1 and 2, a rail denoted by reference numeral 1 is a rail having a plurality of fixed teeth 2 thereon, and a pair of linear rails 1 a and 1 b is 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) is attached to the movable body 4 to knit fibers.

Although not shown, the core pieces 8A of the core body 8 are bonded and laminated with an adhesive agent between the core pieces 8A. Hole 20,
No. 21 is ground as a dimensional reference to make it flush with each other, each lower surface is aligned on the same plane, and the gap length is accurately ensured. The fixed tooth 2 is also formed in the same manner as the moving tooth 9, and the same surface as the rail portions 1a and 1b is polished on the upper surface. A plate-shaped magnet 15 made of a rare earth such as samarium cobalt is fitted into the through hole 5. The shaft holes 20 and 21 are formed at the outer end positions of the first core portion 8a and the second core portion 8b.
Shafts 22 and 23 made of a non-magnetic material are directly inserted into the shafts 0 and 21, and bearings made up of well-known inner and outer rings are rotatably provided on the shafts 22 and 23 as the wheel 3 at both ends of the shafts 22 and 23. ing. That is, the inner ring of this bearing has the shafts 22, 2
The outer ring functions as the wheel 3 by being fitted to the wheel 3.

A first bobbin 27 is provided between the first and second recesses 25 and 26 formed in the core portions 8a and 8b.
A coil 28 and a second coil 29 are wound, and the magnetic poles 10, 11, 12, 13 are arranged apart from each other by the concave portions 25, 26 and the concave portion 30 formed between the magnetic poles 11, 12. ing. Further, as shown in FIG. 7, the small tooth 9 in each of the magnetic poles 10 to 13 is 1 / th between the magnetic poles 10 and 11.
2 pitches, 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.
They are formed by shifting / 4 pitch.

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 movable body 4 having the core body 8 moves stepwise by a predetermined amount as the wheel 3 rotates. As described above, for example, embroidery knitting can be performed by attaching the handle thread guide pin 30 which is a knitting needle to the movable body 4 and knitting with a knitting machine.
In addition, FIG.
For reference, the thrust acting on the movable body 4 during the operation shown in (1) can be expressed by the well-known equations (1) to (4) according to the following equations 1 and 2.

[0011]

[Equation 1]

[0012]

(Equation 2)

Next, a method of driving the fiber knitting machine will be described. First, the linear stepping motor 20 for the fiber knitting machine shown in FIG. 1 described above includes a full-step method by one-phase or two-phase excitation and a half-step method by one-two-phase excitation by a well-known drive excitation method. In the step method, one pulse moves 1 / 4T (tooth pitch), and in the half step method, one pulse moves 1 / 8T (tooth pitch). Here, the tooth pitch T of the small teeth 9 of the movable body 4
And the driving pulse number P, the movable body 4 having the handle thread guide pin 30 is 1/18 in consideration of the above-mentioned excitation method.
The following equations (5) to (8) are used to show the state of movement at a movement pitch of inch or 1/24 inch.

[0014]

(Equation 3)

Therefore, when the tooth pitch T is obtained by changing the number P of driving pulses in the above equations (5) to (8), the following Table 1 is obtained.
It is as shown in Table 1.

[0016]

[Table 1]

In Table 1, the movable body 4 is 1/18.
If the common tooth pitch T that moves by 1 inch and the tooth pitch T that moves by 1/24 inch are picked up, the tooth pitch T becomes 1/9, 1/18, 1/27, 1/36. It is considered that the tooth pitch T is limited in view of the processing ability of manufacturing the small teeth 9 of the movable body 4. Therefore, in the full-step method, every 4 pulses, in the half-step method, every 8 pulses, each moves at a movement pitch of 1/18 inch, and in the full-step method, every 3 pulses.
In the half-step method, it is possible to move every 1/24 inch for every 6 pulses. That is, it is possible to perform the step movement of the movable body 4 at a movement pitch of 1/18 inch or 1/24 inch only by changing the number of pulses by sharing one linear step motor 50.

[0018]

Since the linear step motor and the driving method for the fiber knitting machine according to the present invention are configured as described above, the following effects can be obtained. That is, different moving amounts of the movable body can be obtained by one linear step motor only by changing the number of drive pulses, and the moving amount of the pattern thread guide pin can be arbitrarily changed to change the pattern by one knitting machine. It is possible to obtain knitted fabrics of different types.

[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 principle configuration diagram of FIG. 1.

FIG. 8 is an operation principle diagram of FIG. 1;

FIG. 9 is an enlarged view showing a main part of FIG.

[Explanation of symbols]

 1 Rail 2 Fixed Tooth 3 Wheel 4 Movable Body 5 Through Hole 8 Core Body 8a, 8b Core 9 Small Tooth 30 Handle Thread Guide Pin 50 Linear Step Motor for Textile Knitting Machine

Claims (2)

[Claims] 1. Rail having a large number of fixed teeth (2) at the top
(1) and a first core portion (8a) and a second core portion (8b) having wheels (3) traveling on the rail (1) and having a plurality of small teeth (9) at the bottom 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 of the above coils (28,2
In the linear stepping motor for the fiber knitting machine in which the movable body (4) is moved by selective excitation to (9), the tooth pitch of the fixed teeth (2) and the small teeth (9) is 1/9, 1 / 18,
Either of 1/27 or 1/36 inch, the movable body
A linear step motor for a fiber knitting machine characterized in that (4) is configured to move at a movement pitch of 1/18 inch or 1/24 inch. 2. Rail with a large number of fixed teeth (2) at the top
(1) and a first core portion (8a) and a second core portion (8b) having wheels (3) traveling on the rail (1) and having a plurality of small teeth (9) at the bottom 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 of the above coils (28,2
9) The pattern yarn guide pin (30) is driven by using the linear step motor (50) for the fiber knitting machine, which is configured to move the movable body (4) by selective excitation to the fiber knitting machine. A method for driving a textile knitting machine, characterized in that the moving pitch of the handle yarn guide pin (30) is changed to at least 1/18 inch or 1/24 inch by changing the drive pulse of the machine linear step motor (50). .