CN1294388A - Swing actuator - Google Patents

Abstract

An oscillating actuator is provided which includes a coil-holding member, and a carriage member. The carriage member has a bearing hole and at least one arm, and the at least one arm has a head portion and an intermediate portion arranged between the head portion and the bearing hole. Thickness of the intermediate portion is smaller than a thickness of the head portion. The oscillating actuator having this structure exhibits excellent dimensional stability when used in a disk apparatus, and can be produced easily and economically.

Description

Swing actuator

The present invention relates to a kind of swing actuator, more particularly, relate to coil device for example hard disk or the used swing actuator of disk set, this actuator demonstrates good dimensional stability, and can be by convenient and production thriftily.

Be used to coil the actuator of device up to now, usually all as shown in Figure 8, comprise a bearing carrier 2, this member has sandwich construction, this structure has many bars 5 and a movable coil 3, and this coil is supported by a coil supports member 1, and makes bearing carrier swing around dead eye 4.End portion at every bar is connecting a head gimbals, and a functional component for example magnetic head (not shown) or similar object are housed above.Movable coil is the coil that is wound in by the conductor wire that is coated with dielectric film.When electric current passed through coil, owing to have the effect of the magnetic circuit (not shown) of permanent magnet, driving force acted on coil, and bearing carrier swing around dead eye.

Up to now, bearing carrier is from the viewpoint of intensity and ability to work, with for example aluminium alloy manufacturing of metal material.Yet,, require to have many shapings and step of cutting producing by the metal material made bearing carrier of aluminium alloy for example.Therefore, the production cost height, and throughput rate is low.

Recently, owing to require to increase the recording density of disk and reduce the access time, just need lighter swing actuator, so that further improve the accuracy and the locating speed of swing actuator.Therefore, just develop swing actuator with bar that resin makes.

For example, in No. 8 (1996)-306141, Japanese Patent Application Publication text Ping-Di, because the bar that resin is made can be with low-cost production, and demonstrate good dimensional stability and mechanical property, so just recommend a kind of bar, this bar has a hardware, and this hardware has a through hole to connect head gimbals in order to part endways, and this member is by forming according to an injection moulding mode and a metal part deciliter thermoplastic resin that becomes one.Yet, have the bar of the made member of resin, problem on deformation is but arranged, for example, because the difference of curing degree between surface portion and the interior section, often bending can appear in bar.

In No. the 8th (1996)-336584, Japanese Patent Application Publication text Heisei, owing to produce method with good dimensional stability, be to adopt a kind of resin with minimum cost, so just recommend a kind of method, according to this method, prepare a kind of intermediate product according to the injection moulding mode with the made coupling part of resin, this coupling part between each rod unit, cut from or unload, and the made coupling part of resin is after intermediate product fully solidify, from the intermediate product that prepare cut from.Yet, according to this kind method, because the necessary made coupling part of removal resin, so produce to get up will spend the long period, and this method has shortcoming aspect throughput rate.In addition, be difficult to produce its accuracy and be enough to be applicable to that accurate device for example coils the bearing part of device.

Purpose of the present invention provides a kind of for example swing actuator of hard disk or disk set of device that is used to coil, and it demonstrates good dimensional stability, and can be convenient and produce thriftily.

Every inventor of the present invention is in order to address the above problem, done broad research, the result who draws is: during producing bearing carrier, a center section and a head part of having the order of arranging when the bar of bearing carrier according to leaving bearing carrier centre bearer hole, and when the thickness of middle thickness partly less than the head part, the distortion of bar (bending) just can be avoided, and the dimensional stability of product improves.The present invention finishes according to this understanding.

The invention provides:

(1) a kind of swing actuator, it comprises a coil supports member and a bearing carrier that comprises a dead eye and one or more bar, wherein, bar has the center section and the head part of arranging according to the order of the dead eye that leaves bearing carrier, and the thickness of center section is less than the head part;

(2) a kind of (1) described swing actuator, wherein, bearing carrier is made of electroconductive resin with being integrated;

(3) a kind of (1) described swing actuator, wherein, bearing carrier is a laminates, in this laminates, the parts of bar and distance piece are staggered to be settled, and they are made by electroconductive resin;

(4) a kind of (1) described swing actuator, wherein, bar has a plurality of juts, and these juts are positioned in staggered being located in the place, upper and lower position on the side surface of bar, and they are used to hold lead;

(5) a kind of (1) described swing actuator wherein, on a surface of bar, forms the groove that some partly stretch to dead eye from the head;

(6) a kind of (1) described swing actuator wherein, on the surface of bar, forms the rib that some partly stretch to dead eye from the head; And

(7) a kind of (6) described swing actuator, wherein, along with from the head the part stretch to dead eye the vertical direction of those ribs, on the surface of bar, form second kind of rib.

Preferred embodiment more of the present invention comprise:

(8) a kind of (1) described swing actuator, wherein, bar has a base part at the dead eye place near bearing carrier, and the thickness of this base part is greater than the thickness of center section;

(9) a kind of (1) described swing actuator, wherein, the thickness of center section is about 50% to 80% of head segment thickness;

(10) each described swing actuator in a kind of (2) and (3), wherein, electroconductive resin comprises thermoplastic resin and carbon fiber; And

(11) a kind of (10) described swing actuator, wherein, the content of carbon fiber is calculated by weight, is about 100 parts of thermoplastic resins with 10 parts to 100 parts carbon fibers.

Fig. 1 (a) shows the planimetric map of a swing actuator embodiment of the present invention;

Fig. 1 (b) shows the side view of a bearing carrier embodiment in the swing actuator of the present invention;

The partial side view of the embodiment of Fig. 2 (a) display pole;

The partial side view of the another embodiment of Fig. 2 (b) display pole;

Fig. 3 shows the side view of a bearing carrier embodiment;

Fig. 4 (a) shows the planimetric map of a rod unit embodiment;

Fig. 4 (b) shows the planimetric map of a distance piece embodiment;

Fig. 5 shows the fragmentary, perspective view of a bar embodiment of bearing carrier;

Fig. 6 shows the fragmentary, perspective view of another bar embodiment of bearing carrier;

Fig. 7 shows the fragmentary, perspective view of another bar embodiment of bearing carrier;

Fig. 8 shows the cut-open view of a routine conventional swing actuator.

Label among above-mentioned each figure has following meanings:

1. coil supports member;

2. bearing carrier;

3. movable coil;

4. dead eye;

5. bar;

6. center section;

7. head part;

8. base part;

9. the start line that reduces of thickness;

10. rod unit;

11. distance piece;

12. shrinkage pool;

13. boss;

14. jut;

15. through hole;

16. assembling structure;

17. groove;

18. rib;

19. second kind of rib;

Swing actuator of the present invention comprises a coil supports member and a bearing carrier, and this bearing carrier comprises a dead eye and one or more bar.Bar have according to the order of the dead eye that leaves bearing carrier and a center section and a head part of arranging, and the thickness of center section is less than the thickness of head part.Fig. 1 (a) shows the planimetric map of a swing actuator embodiment of the present invention, and Fig. 1 (b) shows the side view of a bearing carrier embodiment of this swing actuator.Swing actuator of the present invention comprises a coil supports member 1 and a bearing carrier 2.In this embodiment, the structure of coil supports member is, a coil 3 is wherein arranged, and its swing actuator in being embedded in resin provides driving force.The present invention adopts air core coil, is not subjected to special restriction.For example, can adopt air core coil, this coil is the fusing cementing line that is made of lead, the number of turns with regulation, kinking is around the fuse of the coiling folder of a regulation, handle and make with adding hot-air simultaneously, and this lead there is one deck to melt bonding plated film outermost one deck as heart line.

The bearing carrier of present embodiment comprises that 4, one of dead eyes insert in this hole the rotating shaft of swing actuator swing, and bearing carrier also comprises a bar 5.This bar has center section 6 and is used for for example head part 7 of magnetic head of linkage function member, and these two parts are according to the series arrangement of the dead eye that leaves bearing carrier.In swing actuator of the present invention, preferably bearing carrier has 1 to 5 bar.Shown in Fig. 1 (b), in the bar of swing actuator of the present invention, the thickness of center section 6 is less than the thickness of head part 7.The thickness of head part is not subjected to special restriction.Preferably the thickness of head part is about 1 to 3 millimeter.When the thickness of head part during, just may make undercapacity with the linkage function member less than 1 millimeter.When the thickness of head part surpasses 3 millimeters, just may make the thickness of dish device excessive.Center section and head be the thickness difference of the two partly, unspecial restriction.Preferably the thickness of center section is about 50% to 80% of head segment thickness, and being more preferably is 60% to 70%.When the thickness of centre part less than the head segment thickness 50% the time, the rigidity of possible bar and intensity are just not enough.When the thickness of centre part surpass the head segment thickness 80% the time, (bending) just may appear being out of shape in bar.

Because reduced the thickness of center section, during injection moulding, the resin solidification rate variance just reduces between the surface portion of center section and the interior section, and the center section distortion (bending) of bar can prevent to produce bearing carrier the time.Therefore, just can obtain to demonstrate the swing actuator of very outstanding dimensional stability.During producing bearing carrier, the resin solidification required time shortens, and just can boost productivity by shortening the production time.

In the bar of swing actuator of the present invention, with shown in Fig. 1 (b),, can form the base part 8 of its thickness greater than center section thickness near the dead eye place as Fig. 1 (a).The thickness of base part is not subjected to special restriction.Preferably the thickness of base part is identical with the thickness of head part.Because the thickness of base part is greater than the thickness of center section, and base part is formed near the dead eye place, just can increase the rigidity and the intensity of bar.When bearing carrier has many bars.On all bars or some of them bar, can form base part.For example, when bearing carrier has 3 bars, can form base part on those two bars outside, and on middle that root bar, not form base part.

In swing actuator of the present invention, center section and head portion boundary shape, or the boundary shape of center section and base part are not subjected to special restriction.For example, shown in Fig. 1 (b), can form these shapes, or shown in Fig. 2 (a), these shapes can be round at corner by the junction on two planes.Interchangeablely be, shown in Fig. 2 (b), can form this shape from level and smooth slope, there is an end on this slope at the thickness part 7 thickness lines 9a place that begins to reduce from the head, the lines 9b that other has an end to begin to reduce from base part 8 thickness at thickness.Center section and head portion boundary shape, and the boundary shape of center section and base part can be mutually the same, or differ from one another.

In swing actuator of the present invention, can adopt electroconductive resin to produce bearing carrier according to the injection moulding mode with being integrated.When the injection moulding bearing carrier, be preferably in round head and partly locate, or, form injection hole near the dead eye place.Make preferably also that to mould temperature lowlyer fixed, and carry out injection moulding with less injection pressure.By mould bearing carrier with being integrated, just can produce bearing carrier rapidly, and can boost productivity.

In swing actuator of the present invention, can mould rod unit and distance piece respectively, produce bearing carrier, rod unit and distance piece are all made with electroconductive resin, and rod unit and the distance piece moulded alternately settled, to form lamination.Fig. 3 shows the side view of the used bearing carrier embodiment of the present invention.The bearing carrier of present embodiment is a lamination, and wherein, rod unit 10 and distance piece 11 are alternately to settle.The planimetric map of Fig. 4 (a) display pole parts, Fig. 4 (b) then shows the planimetric map of distance piece.In the present embodiment, in the peripheral part of the dead eye 4 of rod unit 10, form a plurality of shrinkage pools 12, and in the peripheral part of the dead eye 4 of distance piece 11, form a plurality of boss 13.By boss is fitted in the shrinkage pool, rod unit and spacer layers are stacked.The height of boss is about half of the outer edge thickness of dead eye of rod unit, or shorter.Interchangeable is can form boss on rod unit, and form shrinkage pool on distance piece.Owing to be separately to mould rod unit, just can obtain less to be out of shape the bar of (bending).Owing to use the shrinkage pool that can be assembled together and boss to make rod unit and distance piece stacked, the position of fixed bar parts and distance piece stably just.When by assembling when coming stacked rod unit with distance piece, the employing bonding agent just can be bonded together rod unit and distance piece.

In swing actuator of the present invention, the most handy electroconductive resin is made bearing carrier.When bearing carrier is when making with electroconductive resin, on bearing carrier, can not form electric charge, and can avoid the negative interaction of the electric charge on the functional component that end connected of bar.Electroconductive resin is not done special restriction.Electroconductive resin preferably contains the thermoplastic resin of carbon fiber, and it has and is about 10 to 10 ⁵Ω cm, be more preferably 10 ²To 10 ⁴The intrinsic body resistivity of Ω cm.When the intrinsic body resistivity of this resin during, will increase with the amount of the carbon fiber of mixed with resin, and may make plasticity undermined less than 10 Ω cm.When the intrinsic body resistivity of resin surpasses 10 ⁵During Ω cm, the negative interaction of possible electric charge just rises.

In the present invention, the thermoplastic resin as electroconductive resin is not subjected to special restriction.The example of thermoplastic resin, comprise for example polyphenylene oxide resin, vibrin polyethylene terephthalate and polybutylene terephthalate, polyphenylens sulfide resin, polysulfone resin, polyether ketone resin polyetheretherketone, full-aromatic polyester resin for example enhanced polypropylene, the thermotropic liquid crystal polymer of polyarylate, ABS resin, polyolefin resin for example for example for example of nylon, polyacetal resin, polycarbonate resin, modification of polyamide, and polyetherimide.Various thermoplastic resins can singly be planted use, or two or more are used in combination.In these resins, preferably use polyphenylens sulfide resin and thermotropic liquid crystal polymer.

In the present invention, the carbon fiber that is used for electroconductive resin is not subjected to special restriction.For example, can use any polyacrylonitrile carbon fiber and asphalt-based carbon fiber.Can adopt the carbon fiber of any high intensity type, the high-modulus type and ultra high modulus type.Various carbon fibers can singly be planted use.Or two or more are used in combination.Because carbon fiber has been sneaked in the resin, resin has just not only had electric conductivity, and physical strength and rigidity have been arranged.The content of carbon fiber is not subjected to special restriction.The content of carbon fiber is calculated by weight, and preferably there are 10 to 100 parts of carbon fibers 100 parts of thermoplastic resin Rios, are more preferably 20 to 70 parts.When the content of carbon fiber is calculated when being less than 10 parts in 100 parts of thermoplastic resins by weight, the electric conductivity of resin may be just not enough.Calculate by weight in 100 parts of thermoplastic resins when surpassing 100 parts when the content of carbon fiber, the plasticity of resin may will be compromised.

In swing actuator of the present invention, shown in Fig. 1 (b), preferably the bar of bearing carrier has a plurality of jut 14a and 14b, these juts alternately are in respectively on the side surface of bar above and below the position.Because above on the side surface of bar, alternately being in and the cause of a plurality of juts of lower position, lead from the functional component transmission signals, just can be housed inside above on the side surface of bar, alternately being in respectively and between the jut 14a and 14b of lower position, and lead can be not floppily by fit on tightly.

In the bearing carrier that the present invention adopts, as shown in Figure 1, be preferably on that part of bearing carrier of that side of dead eye that contacts with the coil supports member, form through hole 15, and on the sidewall of dead eye, form assembling structure 16.The shape of assembling structure is not subjected to special restriction.For example, can be on the sidewall of dead eye, form some juts or some grooves are used as assembling structure.Owing on dead eye, formed through hole and assembling structure, the resin that forms the coil supports member is when the coil supports member that is connected with bearing carrier is moulded preparation, be pushed in the dead eye with regard to passing through hole, and resin is filled assembling structure so that formation is convenient to insert the cylindrical form of rotating shaft.Therefore, the strength of joint of coil supports member and bearing carrier just increases, and these members can link together with enough intensity.

In swing actuator of the present invention, can be on the surface of the bar of bearing carrier, form some from the head part stretch to the groove of dead eye.Fig. 5 shows the fragmentary, perspective view of a bar embodiment of the bearing carrier that the present invention adopts.In this embodiment, on the center section 6 of bar, formed some from the head part 7 stretch to the groove 17 of dead eye.The quantity of groove is not subjected to special restriction.Can be as shown in Figure 5, on a surface of bar, form some grooves, or can be at some grooves of formation on the upper surface of bar and the lower surface.Since exist these from the head part stretch to the groove of dead eye, the rigidity with contending with along the power of executing perpendicular to the direction on the plane of bar just can be enhanced.So, after swing actuator production, just can avoid bearing carrier bar distortion (bending).Even when the temperature of this device is raise, also can avoid bar distortion (bending).

In swing actuator of the present invention, can on the surface of bearing carrier, form the rib that some partly stretch to dead eye from the head.Fig. 6 shows the fragmentary, perspective view of another bar embodiment of the bearing carrier that the present invention adopts.In this embodiment, on the center section 6 of bar, formed some and partly stretched to the rib 18 of dead eye from the head.The quantity of rib is not subjected to special restriction.Can form single rib or many ribs.Can on a surface of bar, form some ribs, or can on upper and lower two surfaces of bar, form rib as shown in Figure 6.Owing to exist part from the head to stretch to these ribs of dead eye, the rigidity with contending with along the power of executing perpendicular to the direction on the plane of bar just can be enhanced.So, after swing actuator production, just can avoid the bar distortion (bending) of bearing carrier.Even when the temperature of this device is raise, also can avoid bar distortion (bending).

In swing actuator of the present invention, stretch to the rib of dead eye except above-mentioned part from the head, can also on the surface of the bar of bearing carrier, form some second kind of ribs, this rib is along intersecting with preceding a kind of rib with the perpendicular direction of preceding a kind of rib.Fig. 7 shows the fragmentary, perspective view of another bar embodiment of the bearing carrier that the present invention adopts.In this embodiment, on the center section of bar, formed some from the head part 7 stretch to the rib 18 of dead eye, but also formed some second kind of ribs 19, these ribs are along intersecting with preceding a kind of rib with the perpendicular direction of preceding a kind of rib.No matter be the quantity of partly stretching to the sort of rib of dead eye from the head, still the quantity of second kind of rib is not subjected to special restriction.For these two kinds of ribs, can form single rib or many ribs.These ribs can form on a surface of bar as shown in Figure 7, or can all form on upper and lower two surfaces of bar.Owing to exist part from the head to stretch to these ribs of dead eye, and along with the perpendicular direction and second kind of crossing rib of preceding a kind of rib of preceding a kind of rib, the rigidity with contending with along the power of executing perpendicular to the direction on the plane of bar just can be enhanced.So, after swing actuator production, just can avoid the bar distortion (bending) of bearing carrier.Even when the temperature of this device is raise, also can avoid bar distortion (bending).

Produce the method for swing actuator of the present invention, be not subjected to special restriction.For example, can produce actuator, use this method, prepare bearing carrier in the injection moulding mode according to a kind of method; Twine a lead that is coated with electrical insulating film, and the initial end portion and the termination end portion of this lead is connected on the terminal pin, prepare movable coil; Bearing carrier and movable coil are placed on the assigned position of the used injection molding of swing actuator, and fill the used any synthetic resin of coil supporting member in the spray mode toward injection molding.The end portion of movable coil lead is connected with terminal pin, and the most handy spot welding is carried out.When carrying out this connection, high temperature during the soft soldering, can cause some problems, and, may be owing to be plated in the impaired cause of electrical insulating film core impaired or lead of conductive line surfaces, not being connected can appear in the some parts around that part that lead is connected with terminal pin, also may be because the cause of scattering welding, when electric current passes through coil, can be short-circuited.These problems adopt spot welding to solve.When bearing carrier and movable coil are placed on the assigned position of the used injection molding of swing actuator, and when filling the used synthetic resin of coil supporting member toward the mould of annotating in the spray mode, the neighboring and the inside circumference of movable coil are filled resin, and movable coil is embedded in the resin.Therefore, the position of movable coil just can steadily be fixed.Resin is pushed in the dead eye by the through hole in the bearing carrier, and fills assembling structure, so that form in order to insert the shape of rotating shaft.So the strength of joint of coil supports member and bearing carrier just obtains improving, and this two members thereby just can firmly connect each other.In order to form the injection moulding of coil supports member, preferably carry out, thereby do not have excessive load to impose on movable coil with lower pressure.The temperature of the used injection molding of swing actuator is preferably lower.When the resin of injection and the used injection molding of filling swing actuator cooled off and solidifies, this injection molding just was opened, and the swing actuator of being produced is removed.

In swing actuator of the present invention, be used for the synthetic resin of coil supports member, electric insulation resin preferably, its intrinsic body insulation rate is about 10 ⁵Ω cm, or bigger.Form the coil supports member with electric insulation resin, just can avoid short circuit during by movable coil, be used for the electric insulation resin of coil supports member, be not subjected to special restriction at electric current.The example of electric insulation resin, comprise for example nylon, polyacetal resin, polycarbonate resin, modified polyphenylene ether resin, vibrin polyethylene terephthalate and polybutylene terephthalate, polyphenylens sulfide resin, polysulfone resin, polyether ketone resin polyetheretherketone, full-aromatic polyester resin polyarylate for example for example for example of polyamide, ABS resin, polyolefin resin be enhanced polypropylene, thermotropic liquid crystal polymer for example, and polyetherimide.Electric insulation resin can single kind use, or two or more combine use.In these resins, preferably use polyphenylens sulfide resin and thermotropic liquid crystal polymer.In the present invention, can add conductive filler for example carbon fiber and conductive carbon black, so that provide antistatic property for electric insulation resin.

In the present invention, can add filler to the electric insulation resin that forms the coil supports member, or add filler to the electroconductive resin that forms bearing carrier.By adding filler to these resins, the intensity of this resin and rigidity just can be enhanced.The amount of filler is calculated by weight, and preferably 100 parts of resins add about 70 parts of fillers.Calculate by weight in 100 parts of resins when surpassing 70 parts when the amount of filler, resin may just become fragile.Filler to resin adds is not subjected to special restriction.Can adopt any fiberfill or nonfibrous filler.The example of fiberfill comprises glass fibre, potassium titanate palpus brilliant (wisker), zinc paste palpus brilliant (wisker), aluminium oxide palpus crystalline substance (wisker), aramid fiber, alumina fibre, silicon carbide fibre, ceramic fiber, fibrous asbestos, gypsum fiber and metal fibre.The example of nonfibrous filler comprises silicate for example wollastonite, zeolite, cerusite, mica, talcum, porcelain earth, clay, pyroferrite, bentonitic clay, asbestos and alumina silicate; Metallic compound is aluminium oxide, monox, magnesium oxide, zirconia, titanium dioxide and iron oxide for example; Carbonide is carbide of calcium magnesium carbide and marble for example; Sulfate is calcium sulphate and barium sulphate for example; Oxyhydroxide is calcium hydroxide, magnesium hydroxide and aluminium hydroxide for example; Beaded glass; Ceramic bead; Boron nitride; Silit; Graphite; Carbon black; Marble; And tripoli.Also can adopt filler with hollow-core construction.These fillers can be single kind use, but or two or more be used in combination.In these fillers, preferably use fiberfill.Also can use these fillers again after handling with bond, such bond is isocyanate compound, organic silane compound, organic titanate compound, organoborane compounds and epoxy compound for example.By handling filler, just can improve its physical strength with bond.

In the present invention, can be in order to forming the electric insulation resin of coil supports member, and, add other adjuvants in order to form the electroconductive resin of bearing carrier.Add the example of other adjuvants of giving resin, comprise some plastifier, for example polyoxyalkylene oligomer compounds, sulfide compound, ester compounds and organic phosphorus compound; The nucleating agent that is used for crystallization process is talcum, porcelain earth and organic phosphorus compound for example; The agent of injection molding pine oil is silicon organic compound, long chain aliphatic ester compounds and long chain aliphatic amide compound for example; Antioxidant is the fortified phenol compound and the amide compound that is obstructed for example; Lubricant is the lithium stearate of calcium stearate for example; Thermal stabilizer; Ultraviolet inhibitors; Colorant; Flame retarding agent and gas-development agent.

Conclude advantage of the present invention, in swing actuator of the present invention,,, can be avoided its distortion (bending), and after producing, this bar demonstrates good dimensional stability by the bar of the made bearing carrier of synthetic resin at production period.Adopt the made bearing carrier of synthetic resin, eliminated necessity, and throughput rate significantly improves by the rapid processing of the desired multistep of the made conventional bearing carrier of metal.

Claims (7)

1. swing actuator that comprises a coil supports member and a bearing carrier, this bearing carrier comprises a dead eye and one or more bar, wherein, bar has a center section and a head part of arranging according to the order of leaving the dead eye in the bearing carrier, and the thickness of center section is less than the thickness of head part.

2. swing actuator according to claim 1, it is characterized in that: bearing carrier is formed by electroconductive resin with being integrated.

3. swing actuator according to claim 1 is characterized in that: bearing carrier is a laminates, wherein alternately settle some rod units and distance piece, and they is made by electroconductive resin.

4. swing actuator according to claim 1 is characterized in that: bar has a plurality of juts, these juts be placed in alternately be located on the side surface of bar in top and below the position on, and they are used to hold lead.

5. swing actuator according to claim 1 is characterized in that: on a surface of bar, form the groove that some partly stretch to dead eye from the head.

6. swing actuator according to claim 1 is characterized in that: on a surface of bar, form some ribs that stretch to dead eye of part from the head.

7. swing actuator according to claim 6 is characterized in that: on a surface of bar, along with from the head the part stretch to dead eye the perpendicular direction of those ribs, form some second kind of ribs.

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