JPH05321102A - Needle selection actuator for knitting machine - Google Patents

Abstract

PURPOSE:To eliminate the maloperation due to selection of an unselected needle by leakage magnetic fluxes of permanent magnets in selecting a needle with electromagnets of an actuator. CONSTITUTION:The first combined magnet equipped with permanent magnets 19 and 20 having magnetic poles adjacent to one side of electromagnetic poles of U-shaped electromagnets 1 and 2 and the second combined magnet having the same structure as that of the first combined magnet are oppositely installed so as to oppose the respective electromagnets and locate the magnetic poles of the permanent magnets on both sides of the electromagnets. Protectors 22 and 24 composed of a magnetic substance are installed through spacers on the lateral sides of the magnetic poles 14, 15 and 16 of the permanent magnets of the first and second combined magnets and the electromagnetic poles 3 and 4 of the electromagnets.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuator used for needle selection of a knitting machine.

[0002]

2. Description of the Related Art In a flat knitting machine, an electromagnet of an actuator used for selecting needles in a plurality of rows of needle grooves according to a handle or the like is provided at a tail portion of a needle during relative movement of a pair of needles. By sucking the needle butt or the selector butt, the predetermined needle is pulled out from the needle groove and the predetermined needle is selected. At this time, the needle that was not sucked remains at the same position. The butt such as the needle or the selector that has been pulled up and pulled up moves to the magnetic pole side through the magnetic pole top of the electromagnet by the relative movement of the actuator and the needle while being attracted to the magnetic pole top of the electromagnet. Subsequently, the needle butt moves while being attracted to the rising slope provided, and as a result, the needle butt is pulled up higher than butt of other needles.

In the flat knitting machine, the above-mentioned actuator is
It is provided on the carriage and reciprocates left and right according to the knitting of the knitted fabric. Therefore, the magnetic poles of the electromagnets of the actuator have inclined surfaces on both the left and right sides of the top so as to correspond to the rightward and leftward movements of the carriage. If the magnetic flux is concentrated in the magnetic poles of the electromagnet, the attracting force becomes larger. In the actuator, the suction surface for initially sucking the needle butt or the selector butt is the magnetic pole portion, but the magnetic pole portion has slopes on both sides for pulling up the bat. The electromagnet energizes when the bat for attraction faces the magnetic pole and attracts the bat, but the needle bat or the selector bat faces the magnetic pole one after another as the carriage advances. I have to stop. Therefore, in order to prevent the holding force of the already sucked bat from weakening, by providing the magnetic pole of the permanent magnet as an inclined surface following the rising slope of the magnetic pole of the electromagnet, even once the energization of the magnetic pole of the electromagnet is released. The sucked bat continues to be sucked into the actuator as it is. However, if the magnetic poles of the permanent magnets are provided close to the magnetic poles of the electromagnets, the leakage magnetic flux from the magnetic poles of the permanent magnets will occur in the magnetic poles of the electromagnets that are not energized, and the magnetic flux of the leakage magnetic flux will also affect the unselected bats. There is a drawback that it is easy to cause malfunctions such as being lost.

[0004]

SUMMARY OF THE INVENTION In view of the above points, an object of the present invention is to eliminate erroneous operation due to selection of a non-selected needle due to a magnetic flux leaking from a permanent magnet during needle selection by an electromagnet of an actuator.

[0005]

A U-shaped electromagnet is provided with a permanent magnet close to one side of an electromagnetic pole of a U-shaped electromagnet, and a second magnet having the same structure as the first magnet. And a pair of magnetic poles of the permanent magnets facing each other so that the magnetic poles of the permanent magnets are located on both sides of the pair of magnetic poles. A protector made of a magnetic material is provided through the.

[0006]

When the needle to be selected or the butt of the selector among the needles set in the needle groove is opposed to the top attraction surface of the top of the electromagnet pole of the actuator provided at the needle selection position, the electromagnet is selected. When an electric current is applied to the magnet, a magnetic flux is generated in the inverted U-shaped electromagnet from one magnetic pole to the outer magnetic pole in the magnet, and the magnetic flux passes from one magnetic pole into the bat opposite it and passes through the bat. A magnetic flux that enters the other magnetic pole is generated. That is, a magnetic flux flows annularly through the magnet and the bat, and the bat is attracted to the electromagnet magnetic pole.

On the other hand, permanent magnets are provided on both sides of the electromagnet, respectively.
They are located one by one, and there is a flow from one magnetic pole to the other magnetic pole inside the permanent magnet, but 2 outside the magnet.
It flows in the protector of the magnetic body provided between the magnetic poles of the two permanent magnets via the spacer. That is,
The magnetic flux entering the protector from the magnetic pole of the first permanent magnet enters the one magnetic pole of the second permanent magnet from the protector, returns to the inside of the second permanent magnet, and the other magnetic pole of the other of the second permanent magnet. It passes through the protector, enters the other magnetic pole of the first permanent magnet, and returns to the first permanent magnet.

As described above, since the magnetic flux of the permanent magnet always forms one circulation flow through the protector, no leakage magnetic flux is generated there.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of the implementation of the actuator 100 of the present invention will be described with reference to the drawings.

In the illustrated example, the inverted U-shaped electromagnets 1 and 2 are paired, and the magnetic poles 3, 4, 5 and 6 are set downward. In FIGS. The portion is cut away for illustration. The electromagnets 1 and 2 are both electrodes 3, 4,
Coils 7, 8, 9 and 10 are provided on 5 and 6. Each magnetic pole 3, 4, 5, 6 is provided with a top suction surface 11 on its top and an inclined suction surface 12 on its side surface. Inclined suction surface 1
As shown in FIG. 1 and FIG. 4B, 2 is provided outside the pair of magnetic poles 3 and 5 so as to form a mountain shape.
In FIGS. 1 and 4B, the electromagnet 1 is an actuator 100.
When the actuator 100 moves to the right, the electromagnet 2 operates when the actuator 100 moves to the left. Magnetic poles 3, 4,
The permanent magnet magnetic poles 14, 15, 16 each having an inclined surface 13 having the same inclination angle as the inclined attraction surface 12 on each of 5, 5 and 6,
17 are provided adjacent to each other. However, the permanent magnet magnetic pole 14,
There is a small gap between 15, 16, 17 and the electromagnet magnetic poles 3, 4, 5, 6 and a separator 18 is interposed between them so that they do not contact each other (B in FIG. 4). The permanent magnets 19 and 20 are provided between the permanent magnet magnetic poles 14 and 15 and between the permanent magnet magnetic poles 16 and 17, respectively, and the U-shaped electromagnet 1 and the permanent magnet 19 in which the magnetic poles 14 and 15 are provided close to each other And the U-shaped magnet 2 and the permanent magnet 20 in which the magnetic poles 16 and 17 are provided close to each other to form a second assembled magnet. The directions of the magnetic poles of the permanent magnet 19 and the permanent magnet 20 facing each other are opposite to each other. Further, the permanent magnet magnetic pole 14, the electromagnet magnetic pole 3, the electromagnet magnetic pole 5,
On the side surface of the permanent magnet magnetic pole 16, the slope 13 and the inclined attraction surface 1 are provided.
A protector 22 having a sliding edge 21 having the same bending line as 2 is provided via a spacer 23. Permanent magnet magnetic pole 1
5, a protector 24 similar to the protector 22 is also provided on the side surfaces of the electromagnet magnetic pole 4, the electromagnet magnetic pole 6, and the permanent magnet magnetic pole 17 via a spacer 25. Protectors 22, 24
Is made of a plate-shaped magnetic material and has wear resistance, and both spacers 23 and 25 are made of a non-magnetic material such as a stainless steel plate.

By providing the protectors 22 and 24, the butt 26 such as a needle or a selector attracted to the magnetic poles slides in contact with the sliding edge 21 of the protectors 22 and 24, and the electromagnet magnetic poles 3, 4, 5, 6 are provided. Or permanent magnet magnetic pole 1
There is no contact with 4, 15, 16, 17, etc., and they do not wear. Between electromagnet poles 3, 5 and 4, 6
A small gap is provided between them to form a top stable gap portion 27. The butt 26 facing the top attraction surface 11 of the electromagnet magnetic poles 3, 4, 5, 6 contacts the top edge of the protector 24 in the top stable gap 27. By being guided by it, I try not to be jealous and to do a stable operation.

The electromagnets 1, 2 and the permanent magnets 19, 20
The permanent magnet magnetic poles 14, 15, 16 and 17 are housed in a case 28 and fixed by screws 29 and 29. A flange 30 is provided on the case 28, and the flange 30 is appropriately fixed to the carriage.

In the above embodiment, two electromagnets are arranged in parallel, and the top attraction surface is formed on each magnetic pole, and the inclined attraction surface is provided only in one example. However, only one electromagnet is provided and the top attraction surface of the magnetic pole is You may make it provide an inclined suction surface on both sides.

The electromagnetic poles 3 and 4 of the electromagnet 1 and the electromagnetic poles 5 and 6 of the electromagnet 2 provided opposite thereto are in opposite phases, and the permanent magnet magnetic poles 14 and 15 and the permanent magnet magnetic poles 16 and 17 corresponding thereto. And are set to opposite phases.

Therefore, when the electromagnets 1 and 2 are not energized, the magnetic fluxes of the permanent magnets 19 and 20 are, as shown in FIG. 2, permanent magnets 19, permanent magnet magnetic poles 14, protectors 22, permanent magnet magnetic poles 16, permanent magnets. 20, the permanent magnet magnetic pole 17, the protector 24, the permanent magnet magnetic pole 15, and the permanent magnet 19 orbit. When the electromagnet 1 is energized, the permanent magnets 19, 2 shown in FIG.
In addition to the zero magnetic flux, the magnetic flux goes around the magnetic pole 3 of the electromagnet 1, the butt 26 such as a needle or a selector, the magnetic pole 4, and the internal magnetic pole 3 of the electromagnet 1 as shown in FIG. Magnetic pole 6 of electromagnet 2, butt 26 such as needle or selector, magnetic pole 5, internal magnetic pole 6 of electromagnetic pole 2
Orbit around.

It is now assumed that the carriage advances from left to right in FIGS. All the needles or the butt 26 of the selector jack inserted in the needle bed are advanced by the cam (not shown) so as to be pushed down to the height of the top 27 of the sliding edge 21 of the protector 24 of the actuator 100, and to move to the actuator 100. opposite. Then, first, the magnetic poles 5 and 6 of the electromagnet 2 face the butt, but the electromagnet 2 on the leading side is not energized at this time. The selected bat 26 moves from the electromagnet 2 side to the electromagnet 1 side as the carriage advances, while the electrodes 3, 5
Protector 2 for the top stable gap 27 between the spaces 4 and 6.
The butt 26 is prevented from moving by the sliding edges 21 of 2, 24. The selected bat 26 is the electromagnet 1 on the trailing side.
When the electromagnet 1 is energized when facing the top attraction surfaces 11 of the magnetic poles 3, 4, the magnetic field lines circulate as shown in FIG. The protectors 22 and 24 abut against the sliding edge 21 and slide on the butt 26 as the carriage advances. As described above, the shapes of the sliding edges 21 of the protectors 22 and 24 are the same as those of the inclined attraction surfaces 12 of the electromagnetic poles 3, 4, 5 and 6 and the inclined surface 13 of the permanent magnet magnetic pole 14, so that the electromagnetic poles 3 and 4 are not formed. As the carriage advances, the butt 26 is attracted to the inclined surface 13 of the permanent magnet magnetic pole 14 following the inclined attraction surface 12 of the electromagnetic poles 3 and 4, and the protector 2
The sliding edge 21 of 2, 24 will be raised. The butt 26 that has not been selected and sucked advances as it is, and remains in the low position without being affected by the leakage magnetic flux. When the carriage moves in the opposite direction, the electromagnet 1 is not energized, and the butt 26 is attracted by the electromagnet 2 and the permanent magnet 20.

[0017]

As described above, the actuator of the present invention has the same structure as that of the first magnet assembly in which the permanent magnet is provided on one side of the electromagnetic pole of the U-shaped electromagnet so that the magnetic poles are close to each other. The second assembled magnetic pole of the structure is opposed to each other so that the respective electromagnets face each other and the magnetic poles of the permanent magnets are located on both sides thereof, and the permanent magnet magnetic poles of the first and second assembled magnets and the electromagnet electromagnetic pole side Since a protector made of a magnetic material is provided in the portion through a spacer, the magnetic flux of the permanent magnets 19 and 20 always circulates as a flow in one direction, and does not branch to another in the meantime. In addition, it is possible to prevent malfunction of the actuator without leaking magnetic flux flowing near the magnetic poles in the actuator and sucking the non-suction bat.

[Brief description of drawings]

FIG. 1 is a schematic perspective view in which a part of an actuator of the present invention is omitted.

FIG. 2 is a perspective view, partially omitted, showing the flow of magnetic flux when the actuator of the present invention is not energized.

FIG. 3 is a perspective view, partially omitted, showing the flow of magnetic flux when the actuator of the present invention is energized.

FIG. 4 shows an actuator according to the present invention, in which A is a plan view, B is a longitudinal side view, and C is a bottom view.

FIG. 5 shows an actuator of the present invention, in which A is a side view and B is a rear view.

[Explanation of symbols]

 1, 2 Electromagnets 3, 4, 5, 6 Electromagnetic poles 14, 15, 16, 17 Permanent magnet magnetic poles 19, 20 Permanent magnets 23, 25 Spacers 22, 24 Protector 100 Actuator

Claims (1)

[Claims] 1. A first assembled magnet having a permanent magnet close to a magnetic pole on one side of an electromagnetic pole of a U-shaped electromagnet, and a second assembled magnetic pole having the same structure as the first assembled magnet. Are opposed to each other so that the electromagnets face each other and the magnetic poles of the permanent magnets are located on both sides of the electromagnets. A needle selection actuator for a knitting machine, which is provided with a protector consisting of a body.