JPH0629118A - Swing type actuator - Google Patents

Abstract

PURPOSE:To reduce the whole shape and the size of a permanent magnet by clamping the permanent magnet between a yoke projecting along the outside surface of a coil and a side yoke on one end of the coil in its axial direction. CONSTITUTION:A step is made at a shoulder 12a of a bobbin 12. A permanent magnet 16, which is clamped by the other end of a side yoke 13 and the other end 11b of a yoke 11, is laid out on this step portion. A bobbin 22 is extended to its one end side in the axial direction where a holder 22a is formed. The holder 22a envelops both ends 11a and 11b, the permanent magnet 16, the side yoke 13 and a yoke piece 23 so that they may be positioned. This construction makes it possible to reduce the size of the permanent magnet, and what is more, to minimize the outside dimensions of an actuator, and enhance assembling accuracy and make the most use of generated fluxes as well.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat knitting machine in which a lever is housed in a bobbin of a coil, and the other end of the lever is pivotally supported perpendicularly to the axial direction of the coil so that one end of the lever can swing. The present invention relates to an oscillating actuator used for a needle selection mechanism or the like.

[0002]

2. Description of the Related Art Conventionally, the needle selection mechanism of a flat knitting machine has been
A monostable oscillating actuator shown in FIGS. 14 to 18 is used. Such a swing-type actuator is disclosed in, for example, Japanese Patent Publication No. 3-78765 and Japanese Patent Publication No. 4-23404. Of these, Figure 1
4 to 16 show the first prior art, FIG. 14 is a cross-sectional view seen from the front, FIG. 15 is a side view, and FIG. 16 is a cross-sectional view seen from the front in a state of being excited by a coil and rocked. Show.

In each drawing, the yoke 1 is roughly U-shaped and forms a magnetic circuit. Inside the yoke 1,
The bobbin 2 is stored. One end 1a of the yoke 1 opposes one end 3a of the substantially L-shaped side yoke 3 forming a part of the magnetic circuit with a gap. A swingable lever 4 is inserted inside the bobbin 2. The lever 4 is also made of a ferromagnetic material and becomes a part of the magnetic circuit. Bobbin 2
A coil 5 is wound around the. A plate-shaped permanent magnet 6 is sandwiched between the other end 1b of the yoke 1 and the other end 3b of the side yoke 3. The part where the permanent magnet 6 is sandwiched is positioned by the side holder 7. One end of the lever 4 is one end side of the bobbin 2 in the axial direction,
It is located between one end 1 a of the yoke 1 and one end 3 a of the side yoke 3. The other end of the lever 4 is pivotally supported by a pin 8 on the other end side in the axial direction of the coil 2. A lever cap 9 is attached to the tip on one end side of the lever 4. The lever cap 9 is formed of a synthetic resin or the like having good wear resistance and high heat resistance.

FIG. 14 shows a state in which the coil 5 is not energized. The permanent magnet 6 has, for example, N on the other end 1b side of the yoke 1.
The other end 3b side of the side yoke 3 is magnetized to the S pole. The magnetic flux emitted from the N pole is introduced from the other end 1b of the yoke 1 into the yoke 1 and from the pin 8 into the lever 4. This magnetic flux passes through the lever 4 and is introduced into the side yoke 3 from the vicinity of the one end 3a of the side yoke 3,
The other end 3b of the side yoke 3 returns to the S pole of the permanent magnet 6. Due to such a flow of magnetic flux, the tip of the lever 4 is attracted to the one end 3a side of the side yoke 3.

When the coil 5 is energized to generate a magnetic flux in the lever 4 that cancels the magnetic flux generated by the permanent magnet 6,
The tip of the lever 4 is attracted from the one end 3a side of the side yoke 3 to the one end 1a side of the yoke 1, and the state shown in FIG. 16 is obtained. The lever cap 9 prevents the tip 1a of the yoke 1 and the tip 3a of the side yoke 3 from directly contacting the tip of the lever 4 and being damaged by an impact. Thus, since the tip of the lever 4 does not directly contact the one end 1a of the yoke 1 and the one end 1a of the side yoke 3, in order to enhance the magnetic attraction force, the overhanging portions 4a and 4b are provided near the tip of the lever 4. To be

The second prior art shown in FIGS. 17 and 18 is different from the first prior art shown in FIGS.
It has a configuration in which 0 is added. In the reinforcing plate 10, the lever 4 repeatedly applies an impact force to the one end 1a of the yoke 1 and the one end 1a of the side yoke 3 or receives a reaction force during the action as an actuator, so that the yoke 1 and the side yoke 3 are reinforced. It is used to prevent the gap between the and. The reinforcing plate 10 is fixed to the yoke 1 and the side yoke 3 by set screws 10a and 10b, respectively. FIG. 17 is a sectional view seen from the front, and FIG. 18 is a plan view.

[0007]

In the conventional swing type actuator as shown in FIGS. 14 to 18, the permanent magnet 6 is arranged outside the coil 5 with respect to the swinging direction of the lever 4. For this reason, the width of the lever of the swing actuator in the swing direction, that is, L1 shown in FIG. 14 becomes large.

When assembling the oscillating actuator in the needle selecting mechanism of a flat knitting machine, for example, it is necessary to mount a large number of actuators in the carriage. If the size of the oscillating actuator becomes large, the size of the carriage becomes large and the operability deteriorates. Therefore, it is desirable to make the size as small as possible. For this reason,
In the conventional swing actuator, the permanent magnet 6 is miniaturized by using a rare earth magnet having a large BH product, such as samarium cobalt. When a flat plate-shaped rare earth magnet is used as the permanent magnet 6, a large amount of magnetic flux leaks directly between the yoke 1 and the side yoke 3 that sandwich the permanent magnet 6. Therefore, the ratio of the magnetic flux that effectively contributes to the swing of the lever 4 is reduced, the area of the magnetic pole of the permanent magnet 6 is required to be large, and the permanent magnet 6 is relatively large and the cost is increased. Further, when the reinforcing plate 10 for maintaining the mechanical strength is used as in the second prior art, assembly work such as screwing becomes complicated.

An object of the present invention is to provide an oscillating actuator which can reduce the overall shape and the size of the permanent magnet.

[0010]

SUMMARY OF THE INVENTION According to the present invention, a coil is surrounded by a ferromagnetic yoke and a side yoke, and a swingable ferromagnetic lever is provided inside a coil bobbin. One end of the yoke and the side yoke are opposed to each other on both sides, a permanent magnet is sandwiched between the other ends of the yoke and the side yoke, and the lever is placed on one end side of the yoke or one end side of the side yoke depending on the presence or absence of excitation by energization of the coil. In an oscillating actuator that oscillates, the other end of the yoke is projected along the outer surface of the coil at one end side in the axial direction of the coil, and one magnetic pole surface of the permanent magnet is fixed to the lever side of the other end of the yoke. The other end of the side yoke is fixed to the other magnetic pole surface of the permanent magnet.

Further, according to the present invention, the coil is surrounded by a ferromagnetic yoke, and a swingable ferromagnetic lever is provided inside the coil bobbin. One end of a pair of side yokes is provided on both sides near one end of the lever. Oscillating type in which the levers are made to face each other and sandwich a pair of permanent magnets between the yoke and side yoke, respectively, and the lever is swung to one side yoke side or the other side yoke side depending on the polarity of excitation by the dielectric to the coil. In the actuator, both ends of the yoke are respectively projected along the outer surface of the coil at one end side in the axial direction of the coil, and one magnetic pole surface of one permanent magnet is fixed to the lever side of one end of the yoke and the other permanent magnet. The other magnetic pole surface of the side yoke is fixed to the lever side of the other end of the yoke, the other end of the one side yoke is fixed to the other magnetic pole surface of the one permanent magnet, and the other side yoke of the side yoke is fixed. End is a rocking actuator which is characterized in that fixed to one pole face of the other permanent magnet.

According to the present invention, one end side of the coil is
A holder for surrounding and positioning the yoke, the permanent magnet, and the side yoke is provided.

The present invention is also characterized in that the holder is formed integrally with the coil bobbin.

According to the present invention, the lever has overhanging portions extending on both sides in the swinging direction between the coil and one end of the yoke and the side yoke that face each other, and between the overhanging portion of the lever and the coil. And a ferromagnetic member for branching and guiding the magnetic flux from near one end of the yoke.

Further, the present invention is characterized in that the lever is formed so that a cross-sectional area perpendicular to the swinging direction is larger than the remaining portion near one end where the yoke and the side yoke face each other.

[0016]

According to the present invention, in the swing actuator, the lever swings in the coil surrounded by the yoke and the side yoke that sandwich the permanent magnet. The permanent magnet is sandwiched between one end of the coil in the axial direction of the coil and a side yoke and a yoke protruding along the outer surface of the coil to form a monostable oscillating actuator. Therefore, it is not necessary to dispose the permanent magnet outside the coil, and the outer dimension of the lever in the swinging direction can be reduced.
Further, the leakage magnetic flux near the other end of the side yoke also contributes to the magnetic attraction of the lever, and the ratio of the magnetic flux from the permanent magnet to the attraction of the lever increases, so that the permanent magnet can be downsized.

Further, according to the present invention, a bistable oscillating actuator is sandwiched between both ends of the yoke and one end of the pair of side yokes at one end side in the axial direction of the pair of permanent magnet coils. Constitute. The lever swings in a coil surrounded by the yoke. Since it is not necessary to dispose the pair of permanent magnets outside the coil, the outer dimensions of the lever in the swinging direction can be reduced. Further, the permanent magnet and the lever approach each other, and a part of the leakage magnetic flux also contributes to the attraction of the lever, so that the permanent magnet can be downsized.

According to the invention, a holder is provided for surrounding and positioning the yoke, the permanent magnet and the side yoke. By the positioning by the holder, the assembling work of the yoke, the permanent magnet, and the side yoke becomes accurate and easy, a magnetic circuit with high accuracy and less leakage flux can be formed, and the permanent magnet and the coil can be miniaturized. Further, since the holder surrounds the yoke, the permanent magnets, and the side yoke, it is possible to prevent the gap between the both sides of the lever from being widened due to the impact of the lever or the reaction force to the lever.

According to the invention, the holder is formed integrally with the coil bobbin. As a result, the number of parts constituting the swing actuator is reduced and the assembling work is facilitated.

Further, according to the invention, the lever has overhanging portions extending on both sides in the swinging direction between the coil and one end of the side yoke, which are opposed to each other, and the coil. A ferromagnetic member is provided between the protruding portion of the lever and the coil to branch and guide the magnetic flux from the vicinity of one end of the yoke. When the coil is energized to swing the lever, the overhanging portion is attracted by the one end of the yoke and the ferromagnetic member, so that the attraction force increases. Therefore, even if the number of turns of the coil is reduced to reduce the outer dimension of the coil, it is possible to obtain the magnetic attraction force equivalent to that in the conventional case. Further, when the coil is not energized, the overhanging portion on the side yoke side contributes to the magnetic attraction force for attracting and holding the lever to the one end side of the side yoke, so that the size of the permanent magnet can be reduced. Since the coil and the permanent magnet can be downsized in this way, the entire swing actuator can also be downsized.

Further, according to the present invention, the yoke and the side yoke are formed such that the cross-sectional areas perpendicular to the swinging direction of the lever are larger than the remaining portions near the opposing ends. Since the magnetic resistance in the path of the magnetic flux for swinging the lever decreases, the proportion of the magnetic flux effectively contributing to the swing increases, and the coil and the permanent magnet can be downsized.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIGS. 1, 2, 3 and 4 show an oscillating actuator according to an embodiment of the present invention. 1 is a sectional view as seen from the front, FIG. 2 is a side view, FIG. 3 is a plan view, and FIG. 4 is a bottom view. The structure and operation of the swing actuator of this embodiment will be described below with reference to these drawings.

A bobbin 12 is housed in a yoke 11 which is generally U-shaped. One end 11a of the yoke 11 opposes one end 13a of the side yoke 13 with a space.
One end 11a of the yoke 11 and one end 13 of the side yoke 13
One end of a lever 14 housed in the bobbin 12 is interposed in the space facing a. A coil 15 is wound around the bobbin 12. One end of bobbin 12 and one shoulder 1
2a is provided with a step, and the side yoke 13 is provided on this step.
The permanent magnet 16 sandwiched between the other end 13b of the and the other end 11b of the yoke 11 is arranged. On the other side of bobbin 12,
An inner yoke 17, which is a ferromagnetic member, is attached.
The protruding portion 14a of the lever 14 can project into the space between the inner yoke 17 and the one end 11a of the yoke 11. In the space between the one end 13 a of the side yoke 13 and the shoulder portion 12 a of the bobbin 12, the protruding portion 14 b of the lever 14 is provided.
Can project. Overhanging portions 14a, 14 of the lever 14
The hatched portion of b is formed such that the dimension in the thickness direction of the paper surface of FIG. 1 is larger than that of the remaining portion.
The other end of the lever 14 is pivotally supported on the bobbin 12 by a pin 18. The axial direction of the pin 18 is perpendicular to the axial direction of the coil 15. A lever cap 19 is put on the tip of one end of the lever 14. Lever cap 19
Is fixed to the lever 14 by a fixing pin 20.

The yoke 11, side yoke 13 and lever 14 are made of a ferromagnetic material such as mild steel plate.
The permanent magnet 16 is a samarium-cobalt magnet and is magnetized so that the other end 11b side of the yoke 11 has an N pole and the other end 13b side of the side yoke 13 has an S pole. If a current is not passed through the coil 15, the magnetic flux from the N pole of the permanent magnet 16 flows from the other end 11b of the yoke 11 through the inside of the yoke 11 and branches to the lever 14, from the overhanging portion 14b of the lever 14 to the side yoke 13. It flows toward the one end 13a or the other end 13b and returns to the S pole of the permanent magnet 16. As the permanent magnet 16, a magnet having a large BH product, such as a rare earth cobalt-based magnet, is advantageous for downsizing. In this way, one end 1 of the side yoke 13
Since the portions other than 3a also contribute to the attraction force of the lever 14 by the permanent magnet 16, the attraction force for sufficiently holding the lever 14 can be generated even if the permanent magnet 16 is made small.

Also, when the coil 15 is energized and the lever 14 is attracted to the one end 11a side of the yoke 11,
Since the inner yoke 17 that branches from the vicinity of the one end 11a is provided, the suction force between the one end 11a and the inner yoke 17 of the yoke 11 and the overhanging portion 14a of the lever 14 becomes large. The lever 14 is one end 1 of the yoke 11.
1a or the one end 13a of the side yoke 13 is magnetically attracted, the lever cap 19 intervenes and the lever 1
Direct contact of the tip of 4 is prevented. The lever cap 19 is made of synthetic resin such as 6.6 nylon containing 20% glass, which has good wear resistance and is resistant to heat. As a result, even if the number of repetitions of rocking increases,
One end 11 a of the yoke 11 and one end 1 of the side yoke 13.
It is possible to prevent 3a from being damaged by an impact.

On the pin 18 side of the yoke 11 of the swing type actuator, a screw hole 21 for mounting is provided. Using this screw hole, the swing actuator can be fixed, and the displacement caused by swinging the lever cap 19 can be used.

According to the present embodiment, since the permanent magnet 16 is not arranged outside the coil 15, the dimension L in the swinging direction is set.
11 can be made smaller than the conventional dimension L1 shown in FIG. Also, the axial dimension L12 of the coil 15 may be the same as the axial length of the coil required for the conventional rocking actuator shown in FIG. 14 because the cross-sectional area required for the permanent magnet 16 may be small. be able to. In addition, the overhanging portion 14a and the inner yoke 17
Since the coil 15 can be downsized also by the contribution of the magnetic attraction force between and, the dimension L12 can be made smaller than the conventionally required dimension. Further, since the overhanging portions 14a and 14b are provided to increase the cross-sectional area of the magnetic circuit, the magnetic resistance can be reduced.
Since the coil 15 and the permanent magnet 16 can be downsized, the dimensions L11 and L12 can be further reduced. For example, in the embodiment shown in FIG. 1, the thickness of the permanent magnet 16 can be set to 2/3 and the length can be set to 1/3 or less, and the volume can be set to about 20%. This makes it possible to reduce the outer size of the swing actuator and reduce the manufacturing cost.

In this embodiment, the conventional side holder 7 shown in FIG. 14 is not used, and the outer dimension is further reduced by the thickness of this resin. Further, the position where the yoke 11 is bent is reexamined so that the outer dimension is reduced. The inner yoke 17 acting as an auxiliary magnetic pole is attached as an outsert when the bobbin 12 is molded with synthetic resin. As a result, the number of turns of the coil is reduced, and the coil can be downsized.

FIG. 5 shows an oscillating actuator according to another embodiment of the present invention. This embodiment is similar to the embodiment shown in FIGS. 1 to 4, and corresponding parts are designated by the same reference numerals. It should be noted that the focus is on reducing the axial dimension L22 rather than reducing the swing dimension L21. That is, since the number of turns required for the coil 15 is reduced, the length in the axial direction is reduced as much as possible. In such an oscillating actuator, the angular displacement due to the oscillating tip of the lever cap 19 becomes large.

FIGS. 6, 7 and 8 show an oscillating actuator according to still another embodiment of the present invention. 6 is a sectional view as seen from the front, FIG. 7 is a perspective view, and FIG. 8 is a plan view and a front view of the bobbin 22. The present embodiment is similar to the embodiment shown in FIGS. 1 to 4, and corresponding parts are designated by the same reference numerals. It should be noted that the bobbin 22 is extended to one end side in the axial direction and the holder portion 22a is formed.
Inside the holder portion 22a, both ends 11a, 11 of the yoke 11 are
b, the permanent magnet 16, the side yoke 13, and the yoke piece 23 are included. Unlike the embodiment shown in FIGS. 1 to 4 and the embodiment shown in FIG. 5, one end of the yoke 11 is bonded to the yoke 11 to form one yoke as a whole. The lever 14 is sucked by 23a. The yoke piece 23 increases the plate thickness of the joint portion so that the magnetic attraction force between the yoke piece 23 and the overhanging portion 14a of the lever 14 is increased. The side yoke 13 and the yoke piece 23 according to the present embodiment are injection-molded and sintered, for example, iron (Fe) containing 8% nickel (Ni). By using the yoke piece 23 thus formed, the processing accuracy is improved as compared with the case where the one end 11a of the yoke 11 is bent by press working.
The magnetic flux generated from the permanent magnet 16 can be effectively used.

From the lower side of the coil 15, a lead 24 for energizing is drawn out. The lead 24 is drawn out through a recess provided in the yoke 11. In FIG. 7, the coil 15 is omitted. FIG. 8 shows the bobbin 22 as shown in FIG.
Shows a plan view and FIG. 8 (b) shows a front view. By forming the bobbin 22 integrally with the guide portion 22a, the assembly can be easily performed. Further, by separately forming the yoke 11 and the yoke piece 23, the yoke piece 23 can be bonded to the one end 11 a of the bobbin 11 after the lever 14 is inserted in a state where the yoke 11 and the bobbin 22 are combined. It can be assembled easily. Further, the ends 13a and 23a of the side yoke 13 and the yoke piece 23 can be formed to have an angle suitable for the contact of the lever 14, and the magnetic attraction force for holding the lever 14 can be effectively used. Further, in this embodiment, the auxiliary yoke 25 is provided on the bottom of the bobbin 22. As a result, a through hole is provided in the bottom portion of the yoke 11 for accommodating the other end of the lever 14, and as a result, the cross-sectional area of the magnetic circuit is reduced.

FIG. 9 shows still another embodiment of the present invention. This embodiment is similar to the embodiment shown in FIGS. 6 to 8, and corresponding parts are designated by the same reference numerals. It should be noted that the pair of permanent magnets 16,
26 is accommodated to form a bistable swing actuator. The swing lever 27 has no overhanging portion. Two stable states can be obtained by driving the coil 15 in a pulsed manner. Further, since the force of sucking the lever 27 in both directions becomes large, the moving speed of the lever 27 becomes large, and the quick operation becomes possible. Permanent magnet 26
Is magnetized so that, for example, the one end 11a side of the yoke 11 is an S pole and the side yoke 28 side is an N pole.

FIG. 10 shows a needle selection mechanism of a flat knitting machine using the swing actuators 31 to 36 according to the above-mentioned respective embodiments. The lever cap 19 of each of the swing actuators 31 to 36 engages with the needle selecting actuators 41 to 46. Such a needle selecting mechanism is attached to the carriage of the flat knitting machine and is reciprocated in the direction shown by the arrow 47. In the flat knitting machine, the carriage moves on the needle bed and moves the knitting needles 51 to 56 in the arrow 48 direction. This movement is performed by moving the protrusions provided on the knitting needles 51 to 62 by a cam provided on the carriage. Knitting needles 51 to 62 are provided with needle selecting butt 51a to 62a protruding and pressed by needle selecting actuators 41 to 46. At this time, a reaction force is also applied to the lever cap side. When the oscillating actuators 31 to 36 are excited and the needle selecting actuators 41 to 46 are angularly displaced, their tips do not press the needle selecting butt 51a to 62a. When the needle selecting butt 51a to 62a is not pressed, the knitting needles 51 to 62 are in the selected state and move in the arrow 48 direction by the movement of the carriage. The needle selecting butt 51a by the needle selecting actuators 41 to 46.
When ~ 62a is pressed, the knitting needles 51 to 62 are in a non-selected state, and the movement in the arrow 48 direction does not occur even if the carriage moves.

The needle selecting operation in the above flat knitting machine will be described in more detail with reference to FIGS. 11, 12 and 13. A plurality of actuator boxes 71 are attached to the carriage 70 of the flat knitting machine. From each actuator box 71, the needle selection actuators 41 to 41 are connected.
When 46 is projected and the carriage 70 is moved, the needle selecting butts 51a to 56a are pressed as shown in FIG. In FIG. 12, the needle selecting actuators 11 to 46 are all displaced and even if the carriage moves, the needle selecting butt 51 is moved.
Do not press a to 56a. In the state shown in FIGS. 11 and 12, the needle selecting butts 51a to 56a are provided on the selectors 51b to 56b, which are one component forming the knitting needle.

FIG. 13 is a side view of the operation shown in FIGS. 11 and 12. 13 (1) shows the case where the knitting needle is in the non-selected state as in FIG. 11, and FIG. 13 (2) shows the case where the knitting needle is in the selected state as in FIG. Figure 11
And needle selection actuators 41 to 46 shown in FIG.
Are collectively indicated by reference numeral 40. Needle selection butt 51a to 56a and selectors 51b to 5 shown in FIGS. 11 and 12.
6b is generally designated by reference numerals 50a and 50b, respectively. As shown in FIG. 13 (1), when the selector 50b is pressed, the select jack 50c that forms a part of the knitting needle is sunk into the needle groove of the needle bed similarly to the selector 50b, and the carriage moves. There is no movement by the cam. In the needle selection state as shown in FIG. 13 (2), the select jack 50c is not sunk, so that the movement of the carriage causes the movement of the knitting needles, and the knitting action is performed.

As described above, according to the embodiments shown in FIGS. 1 to 4, 6 to 8, and 9, the size of the swinging actuator in the swinging direction can be reduced.
It is possible to reduce the outer dimensions of a carriage or the like in which an oscillating actuator shown in FIG. The size of the jack for selecting needles in the knitting needles and the like can be reduced, so that the flat knitting machine can be downsized. Further, according to the embodiment shown in FIG. 5, the size of the swing actuator in the coil axis direction can be reduced, so that the thickness of the carriage of the flat knitting machine can be reduced.

In the above description, the oscillating actuator according to each embodiment is used for the needle selection mechanism of the flat knitting machine, but in a printer or a facsimile machine, for example, a paper pressing mechanism provided in a path for conveying paper, etc. The oscillating motion is used in the above, and the actuators of the respective embodiments can be utilized to similarly reduce the size and weight.

[0038]

As described above, according to the present invention, it is not necessary to dispose the permanent magnet on the outer side of the coil, and it is possible to downsize the permanent magnet. The external dimensions of can be reduced.

Further, according to the present invention, also in the bistable type oscillating actuator, it is not necessary to dispose the pair of permanent magnets on the outer side of the coil, and further, the permanent magnet can be miniaturized. Can be made smaller.

Further, according to the present invention, at one end side of the coil,
Since the yoke, the permanent magnet, and the side yoke can be surrounded and positioned by the holder, the assembly accuracy is improved, and the magnetic flux generated from the permanent magnet can be effectively used. This makes it possible to reduce the outer dimensions of the permanent magnet and the whole. In addition, since it is mechanically reinforced, the gap between the yokes and side yokes facing each other on both sides of the lever is prevented from being opened by the repeated impact of the swing of the lever and the reaction force to the lever, and the magnetic flux from the permanent magnet is prevented. Can be used effectively.

Further, according to the present invention, since the holder is formed integrally with the coil bobbin, the number of parts constituting the swing actuator is reduced and the assembly is facilitated. Since the assembling accuracy is improved, the magnetic flux from the permanent magnet can be effectively used, and the permanent magnet can be downsized.

Further, according to the present invention, it is possible to increase the attraction force for rocking the lever by providing the overhanging portion on the lever and branching the magnetic flux from the one end of the yoke by the ferromagnetic member. As a result, the coil and the permanent magnet can be downsized, and the outer dimensions of the swing actuator can be reduced.

Further, according to the present invention, the magnetic resistance can be reduced by increasing the cross-sectional area of the portion which becomes the path of the magnetic flux when the lever is swung. As a result, the magnetic attraction force to one end of the yoke or one end to the side yoke with respect to the lever becomes large, so that the coil and the permanent magnet can be made small, and the outer size of the swing actuator can be made small.

[Brief description of drawings]

FIG. 1 is a schematic front sectional view of an embodiment of the present invention.

FIG. 2 is a right side view of the embodiment shown in FIG.

FIG. 3 is a plan view of the embodiment shown in FIG.

FIG. 4 is a bottom view of the embodiment shown in FIG.

FIG. 5 is a front sectional view of another embodiment of the present invention.

FIG. 6 is a sectional view of a further embodiment of the present invention seen from the front.

7 is a perspective view of the embodiment shown in FIG.

FIG. 8 is a plan view and a front view of the bobbin 22 of the embodiment shown in FIG.

FIG. 9 is a sectional view of a further embodiment of the present invention as seen from the front.

FIG. 10 is a view showing a needle selection mechanism of a flat knitting machine using an oscillating actuator according to each embodiment of the present invention.

11 is a view showing the operation of the needle selection mechanism of the flat knitting machine shown in FIG.

12 is a view showing the operation of the needle selection mechanism of the flat knitting machine shown in FIG.

13 is a view showing the operation of the needle selection mechanism of the flat knitting machine shown in FIG.

FIG. 14 is a cross-sectional view showing a conventional swing-type actuator as seen from the front.

15 is a right side view of the swing actuator shown in FIG. 14. FIG.

16 is a sectional view showing the operation of the swing actuator shown in FIG. 14 as seen from the front.

FIG. 17 is a sectional view of a conventional swing-type actuator as seen from the front.

FIG. 18 is a plan view of the swing actuator shown in FIG. 7.

[Explanation of symbols]

 11 Yoke 12,22 Bobbin 13,28 Side yoke 14,27 Lever 14a, 14b Overhanging part 15 Coil 16,26 Permanent magnet 17 Inner yoke 19 Lever cap 22a Holder part 23 Yoke piece 31-36 Oscillating actuator 41-46 Selection Needle actuator 51-62 knitting needle

Claims (6)

[Claims] 1. The coil is surrounded by a ferromagnetic yoke and a side yoke, a swingable ferromagnetic lever is provided inside a bobbin of the coil, and one end of the yoke and the side yoke are provided on both sides near one end of the lever. An oscillating actuator that opposes each other, sandwiches a permanent magnet between the other ends of the yoke and side yoke, and oscillates the lever toward one end of the yoke or one end of the side yoke depending on whether or not the coil is energized to energize the coil. The other end of the yoke is projected along the outer surface of the coil at one end side in the axial direction of the coil, one magnetic pole surface of the permanent magnet is fixed to the lever side of the other end of the yoke, and the other end of the side yoke is An oscillating actuator fixed to the other magnetic pole surface of the permanent magnet. 2. The coil is surrounded by a ferromagnetic yoke, a swingable ferromagnetic lever is provided inside the bobbin of the coil, and one ends of a pair of side yokes face each other on both sides near one end of the lever. A pair of permanent magnets are respectively sandwiched between the yoke and the side yoke, and the lever is oscillated to one side yoke side or the other side yoke side by the polarity of the excitation due to the dielectric to the coil. Both ends of the yoke are projected along the outer surface of the coil at one end side in the axial direction of the coil, one magnetic pole surface of one permanent magnet is fixed to the lever side of one end of the yoke, and the other magnetic pole of the other permanent magnet. The surface is fixed to the lever side of the other end of the yoke, the other end of one side yoke is fixed to the other magnetic pole surface of one permanent magnet, and the other end of the other side yoke is the other. Oscillating actuator, characterized in that fixed to one pole face of the permanent magnet. 3. A holder for surrounding and positioning a yoke, a permanent magnet and a side yoke is provided on one end side of the coil.
An oscillating actuator according to any one of 1. 4. The swing actuator according to claim 3, wherein the holder is formed integrally with the coil bobbin. 5. The lever has overhanging portions extending on both sides in the swing direction between the coil and one end of the yoke and the side yokes facing each other, and the overhanging portion between the overhanging portion of the lever and the coil. 2. The swing actuator according to claim 1, further comprising a ferromagnetic member for branching and guiding the magnetic flux from near one end of the yoke. 6. The lever is formed so that a cross-sectional area perpendicular to the swing direction is larger than a remaining portion near one end where the yoke and the side yoke are opposed to each other. The oscillating actuator according to claim 5.