CN104233659B - The driving means of sewing machine - Google Patents

Abstract

The present invention relates to stably to determine the operational ton of pedal, thus be stably driven with the driving means of the sewing machine of sewing machine.Driving means includes bar, magnet, Hall element and amplifier.Bar can rotate within the limits prescribed according to the operation of pedal.Magnet is fixed on bar, moves with the rotation of bar.The magnetic field of Hall element detection magnet.Hall element is relative with above-mentioned magnet in the different position of the plane passed through with the rotation of bar from magnet.Amplifier exports the signal for driving sewing machine based on the magnetic field in the direction vertical with plane detected by Hall element.When bar rotates within the limits prescribed, observing magnet and Hall element from the direction vertical with plane, the middle body of the direction of magnetization relative to position at magnet of the Hall element on the basis of magnet moves.

Description

The driving means of sewing machine

Technical field

The present invention relates to drive the driving means of the sewing machine of sewing machine according to the operational ton of pedal.

Background technology

There are the sewing machine sewing based on the operation of pedal.This sewing machine is based on the operation of pedal Measure and control the rotary speed of motor of sewing machine.Japanese Unexamined Patent Publication No. 191981 publication in 1996 is open There is the linkage of magnet, bar and Hall element.Being fixed with magnet on bar, pole-footing is according to the operation of pedal Rotate.Hall element is relative with magnet.Line displacement is entered according to the rotation of bar in the position of magnet.Bar The position that mechanism determines magnet by magnetically being detected the change from the magnetic field that magnet is subject to by Hall element Put.Therefore, linkage can determine the operational ton of pedal.

The Hall element of this linkage is when the amount of spin of bar is bigger, and relative movement is to the magnetization side with magnet To close region, end.The regional magnetic field close in the end of the direction of magnetization with magnet changes greatly. Linkage causes the magnet positions on the basis of Hall element unstable sometimes owing to timeliness deteriorates.This When, even if the operational ton of pedal is identical, the magnet positions on the basis of Hall element also can be varied from. When close region, the end of Hall element relative movement to the direction of magnetization with magnet, Hall element The change of detection signal is big especially.Therefore, sewing machine cannot stably determine the operational ton of pedal sometimes, Become unstable based on the rotary speed of the motor of sewing machine of the operational ton of pedal.

Content of the invention

Problems to be solved by the invention

It is an object of the invention to, provide the driving means of a kind of sewing machine, it can stably determine steps on The operational ton ground of plate drives sewing machine.

For solution to problem

The driving means of the sewing machine of technical scheme 1 includes: bar, its operating in regulation according to pedal In the range of rotate；Magnet, it is fixed on above-mentioned bar, moves with the rotation of above-mentioned bar；Hall Element, which is the element in the magnetic field detecting above-mentioned magnet, with above-mentioned magnet with the rotation institute of above-mentioned bar The different position of the plane passed through is relative with above-mentioned magnet；And output unit, it is based on above-mentioned Hall element Detected with and the vertical direction of the corresponding above-mentioned plane in position of above-mentioned magnet on magnetic field, output For driving the signal of the drive division of sewing machine；The driving means of this sewing machine is characterised by, above-mentioned magnetic Body is parallel with above-mentioned plane and is respectively provided with magnetic pole different from each other at the both ends of the direction of magnetization；Above-mentioned When bar rotates in the range of above-mentioned regulation, observe above-mentioned magnet and upper from the direction vertical with above-mentioned plane Stating Hall element, the relative position of the above-mentioned Hall element on the basis of above-mentioned magnet is at the magnetic of above-mentioned magnet Move in the range of the middle body changing direction.

The Hall element of above-mentioned driving means magnet the close direction of magnetization central authorities, changes of magnetic field less Region in relative movement.The position of the magnet on the basis of Hall element is either passed through with magnet Still on the direction vertical with this plane, change is there occurs when there occurs change on the parallel direction of plane When, the change in the magnetic field causing because of change in location is all less.Therefore, the driving means of sewing machine is when bar When effect deteriorates and causes the position of the magnet on the basis of Hall element to become instability, can be by Hall unit The change suppression in the magnetic field detected by part is in Min., therefore, it is possible to stably determine the behaviour of pedal Measure.The driving means of sewing machine also can be stably driven with sewing machine when bar timeliness deteriorates.

In the driving means of the sewing machine of technical scheme 2, the above-mentioned magnetization of the scope of above-mentioned middle body The length in direction is less than the half of the length between the above-mentioned magnetic pole of above-mentioned magnet.Now, Hall element with The independently relative movement in the less region of changes of magnetic field all the time of the shape of magnet and characteristic.Therefore, stitch The driving means of machine of threading can independently can be true exactly to sewing machine output with the shape of magnet and characteristic Determine the signal of the operational ton of pedal.

In the driving means of the sewing machine of technical scheme 3, the scope of above-mentioned middle body be with and above-mentioned The scope of the magnetic field linear change on the vertical direction of the corresponding above-mentioned plane in position of magnet.Now, suddenly The shape of that element and magnet and characteristic independently relative movement in the less region of changes of magnetic field all the time. Therefore, the driving means of sewing machine can independently can to sewing machine output with the shape of magnet and characteristic Accurately determine the signal of the operational ton of pedal.

In the driving means of the sewing machine of technical scheme 4, when above-mentioned magnet moves, above-mentioned Hall unit The bearing of trend of the tangent line on the track of the relative position of part intersects with the above-mentioned direction of magnetization all the time.Now, The feelings not intersected with bearing of trend and the direction of magnetization of the tangent line on the track of the relative position of Hall element Condition is compared, and can lengthen the moving range of the magnet that Hall element can detect.Therefore, the driving of sewing machine Dynamic device can be when the operational ton of pedal slewing area relatively big, bar be bigger, can to sewing machine output Determine the signal of the operational ton of pedal.

In the driving means of the sewing machine of technical scheme 5, above-mentioned drive division has the upper of driving sewing machine Axle and make the upper shaft motor that shank moves up and down；It is positioned at above-mentioned at above-mentioned Hall element from above-mentioned Hall element The state of the central authorities of the above-mentioned direction of magnetization of magnet is to the bearing of trend making above-mentioned tangent line and the above-mentioned direction of magnetization When tending to orthogonal direction relative movement, the output of above-mentioned output unit is for driving the signal of above-mentioned upper shaft motor. When operating pedal, when the change quantitative change in the magnetic field detected by Hall element is big, Hall element exists The amount of movement of the direction of magnetization diminishes on the contrary.Now, the change in magnetic field levels off to linearly.The driving of sewing machine Device can substantially linearly determine changes of magnetic field.Therefore, the driving means of sewing machine can be to sewing machine The output of upper shaft motor can substantially linearly determine the signal of operational ton of pedal.

Technical scheme the 6th, 7 sewing machine driving means in, above-mentioned drive division has the tangent line of sewing machine The electromagnetic component of mechanism, the tangent mechanism of this sewing machine is used for cutting off sewing thread；At above-mentioned Hall element certainly Above-mentioned Hall element is positioned at the state of the central authorities of the above-mentioned direction of magnetization of above-mentioned magnet to making prolonging of above-mentioned tangent line When stretching the direction relative movement that direction and the above-mentioned direction of magnetization tend to parallel, the output of above-mentioned output unit is used for driving Move the signal of above-mentioned electromagnetic component.Now, the increase of the operational ton of adjoint pedal, Hall element is detected To the variable quantity in magnetic field sharply increase.But, as long as the solenoidal signal driving tangent mechanism User with ormal weight more than operate pedal when export.The driving means of sewing machine does not needs line Property ground determine pedal operational ton.Therefore, the driving means of sewing machine deteriorates in bar timeliness and causes with suddenly When the position of the magnet on the basis of your element becomes instability, also can determine more than ormal weight insusceptibly The operation of pedal and output signal.

In the driving means of the sewing machine of technical scheme 8～12, see from the direction vertical with above-mentioned plane Upper on the basis of above-mentioned magnet when examining above-mentioned magnet and above-mentioned Hall element, when not operating above-mentioned pedal State the central authorities that the relative position of Hall element is positioned at the direction of magnetization of above-mentioned magnet.Do not operate user and step on During plate, the magnetic field detected by Hall element is 0.Magnet departing from bar when, detected by Hall element Magnetic field be 0, unrelated with the operating position of pedal.Therefore, the driving means of sewing machine can be in Hall unit When magnetic field detected by part is 0, to sewing machine output for stopping the signal of sewing.

Brief description

Fig. 1 is the stereogram of sewing machine 1.

Fig. 2 is the left view of driving means 31.

Fig. 3 is the right view of driving means 31.

Fig. 4 is the right view of the driving means 31 eliminating bar 32.

Fig. 5 is the block diagram of the electrical structure of sewing machine 1.

Fig. 6 is the right view being exaggerated the second extension 322.

Fig. 7 is the curve map of the magnetic flux density representing magnet 33 periphery.

Fig. 8 is the right view being exaggerated the second extension 322.

Fig. 9 is the right view being exaggerated the second extension 322.

Figure 10 is the sectional view of the X-X alignment apparent direction of Fig. 3.

Detailed description of the invention

It is described with reference to embodiments of the present invention.The structure of sewing machine 1 is described with reference to Fig. 1.Following Explanation in, use the top to bottom, left and right, front and rear shown in arrow in figure.The 2nd, sewing machine 1 includes support portion Support column portion 3 and horn portion 4.Support portion 2 becomes the base of sewing machine 1.Support portion 2 from installed above in work In the rectangular opening (omitting diagram) of station 20 upper surface.The right-hand member from support portion 2 for the support column portion 3 is upward Extend.The upper end in self-supporting post portion of horn portion 43 extends towards left, relative with the upper surface in support portion 2.Machine Arm 4 has presser feet 17 below left part, and presser feet 17 is relative with the needle plate 15 being located at support portion 2 upper surface. Horn portion 4 maintains shank 7 and upper shaft 14 in inside, and shank 7 is provided with eedle 8 in lower end.Shank 7 and machine Pin 8 vertically moves back and forth under the driving of upper shaft motor 30.Support column portion 3 is on right flank top has Axle motor 30.Upper shaft 14 extends inside horn portion 4 in left-right direction with the state that can rotate.Upper shaft 14 Right-hand member be connected with upper shaft motor 30.The left end of upper shaft 14 and shank up-down mechanism (omitting diagram) It is connected.Upper shaft motor 30 makes upper shaft 14 rotate, and drives shank up-down mechanism to make shank transport about 7 Dynamic.Needle plate 15 has pin hole (omitting diagram) in substantially central portion.The lower end of eedle 8 decline when from pin Hole is passed through.Needle plate 15 in the left of pin hole, rear, right, front have work feed perforation and (save sketch map Show).Support portion 2 has shuttle mechanism (omitting diagram) in the lower section of needle plate 15 and cloth feeding mechanism (omits Diagram).Upper shaft motor 30 drives shuttle mechanism and cloth feeding mechanism.Shuttle mechanism, the structure of cloth feeding mechanism are Known, therefore omit the description.

Sewing machine 1 has tangent mechanism (omitting diagram).Tangent mechanism includes linkage, electromagnetic component 60 (with reference to Fig. 5) and cutoff tool.Linkage is to the revolving force of cutoff tool transmission upper shaft 14.Electromagnetic component 60 drive link mechanisms.Cutoff tool is positioned at the downside of needle plate 15, utilizes the revolving force of upper shaft 14 to cut off sewing Line.

Sewing machine 1 has control device 16 in the lower section of workbench 20.Control device 16 has at left surface Driving means 31 (with reference to Fig. 2).Driving means 31 is connected with the pedal 22 of override type by connecting rod 21. Driving means 31 exports when user is towards toe side or heel side operating pedal 22 to control device 16 and steps on The direction of operating of plate 22 and the corresponding signal of operational ton.Control device 16 inputs according to automatic drive device 31 Signal determines direction of operating and the operational ton of pedal 22.Control device 16 is stepped on towards toe side operation user During plate 22, the rotary speed of the operational ton regulation upper shaft motor 30 according to pedal 22, control sewing speed. Control device 16 user towards heel side operating pedal 22 when, drive tangent mechanism electromagnetic component 60 and Drive link mechanism.Linkage cuts off sewing thread to the revolving force of cutoff tool transmission upper shaft 14, cutoff tool.

With reference to Fig. 2～Fig. 4, driving means 31 is described.Driving means 31 includes housing the 311st, bar the 32nd, magnet 33rd, substrate the 41st, extension spring 42 and stop 43.Eliminate bar 32 in the diagram.Being shaped as of housing 311 is big Cause cuboid.Housing 311 has the protuberance 314 highlighting forward on the upside of leading section.Housing 311 is on the right side Side (the paper side in Fig. 3, Fig. 4) has opening 312.Housing 311 has through in left-right direction Hole 44 and four holes 313.Four holes 313 lay respectively at protuberance 314 leading section upper end and lower end, leading section, Housing 311 rearward end upper end, the above-below direction substantial middle of housing 311 rearward end.Hole 44 is positioned at housing 311 Rearward end lower end.Driving means 31 screw passing through from four holes 313 respectively is fixed on control device The left surface of 16 (with reference to Fig. 1).When being fixed to driving means 31 on control device 16, control dress Put the opening 312 of the left surface blocking housing 311 of 16.The axle portion 323 of bar 32 passes through from hole 44.Bar 32 Including the first extension the 321st, the second extension 322 and axle portion 323.First extension 321 is at housing 311 The left side of left surface (the paper side in Fig. 2) extends along the longitudinal direction.Being shaped as of first extension 321 The tabular being rectangle is observed in side.The leading section of the first extension 321 is positioned on the downside of housing 311 leading section Front and the lower section of protuberance 314 being positioned at housing 311.The rearward end of the first extension 321 is positioned at hole 44 Left side.First extension 321 has two hole 321A in leading section.Two hole 321A are along the longitudinal direction Arrangement.Two hole 321A are through in left-right direction respectively.Connecting rod 21 (with reference to Fig. 1) is screwed Any one hole in two hole 321A.First extension 321 direction substantial middle before and after bottom Rear side there are four groove 321B.Four groove 321B arrange along the longitudinal direction, cave in upward.Extension spring 42 Engaging in any one groove in four groove 321B.Axle portion 323 passes through from the hole 44 of housing 311, at housing Extend in left-right direction between outside the inner side of 311 and left surface.Axle portion 323 is shaped as cylindrical shape.Axle The diameter in the cross section in portion 323 is substantially equal to the internal diameter in hole 44.Axle portion 323 can rotate.The left end in axle portion 323 The rearward end of the first extension 321 is fixed in portion.The second extension 322 is fixed in the right part in axle portion 323 (with reference to Fig. 3).Second extension 322 is located at the inside of housing 311.Second extension 322 is from axle portion 323 Standing part forward tiltedly upside extend.Second extension 322 be shaped as tabular.Second extension 322 Left surface (the paper dorsal part in Fig. 3) in the end of the side contrary with the side being fixed on axle portion 323 is solid Determine magnet 33.The tabular being rectangle is observed in the side that is shaped as of magnet 33.Magnet 33 prolongs along with second The plane that when extending portion 322 rotates, the left surface (the paper dorsal part in Fig. 3) of the second extension 322 is passed through is parallel Direction magnetization.Hereinafter, when rotating the second extension 322, the left surface of the second extension 322 is passed through Plane be referred to as datum plane.As shown in Figure 10, magnet 33 has flat at surface (the paper dorsal part in Fig. 3) Smooth part 331 and sloping portion 332.The flat 331 of the surface 33A of magnet 33 and the second extension The left surface of 322 is in the same plane.Therefore, the flat 331 of magnet 33 is at the second extension 322 Move along datum plane during rotation.

As shown in Figure 4, driving means 31 has substrate 41 in housing 311.Substrate 41 for side observe in Rectangular tabular, is fixed on the inner side (the paper side in Fig. 4) of the left surface of housing 311 with screw 411. Rear side on its right flank (the paper side in Fig. 4) for the substrate 41 is provided with Hall element 34 and amplifier 35.Hall element 34 and amplifier 35 are positioned at the left side of datum plane.Hall element 34 is relative with magnet 33. Hall element 34 is to detect the composition orthogonal with datum plane in the magnetic flux density of magnet 33 periphery Magnetic Sensor.After the signal of magnetic flux density detected by Hall element 34 for the amplifier 35 is amplified Output a signal to CPU45 (with reference to Fig. 5).As it is shown on figure 3, Hall element 34 is positioned at the left side of magnet 33. Between Hall element 34 and magnet 33, the distance (interval) at left and right directions is 2.0mm.Driving means 31 Include extension spring 42 and stop 43 in the outside (the paper side in Fig. 2) of the left surface of housing 311.Extension spring 42 before and after housing 311 rear side of direction substantial middle vertically extending.The upper end of extension spring 42 is locking In the bar-shaped protuberance 315 prominent towards left side from housing 311 upper end.The lower end of extension spring 42 is engaging in first The groove of the side the most rearward in four groove 321B of extension 321.Extension spring 42 is upward to the first extension 321 Force.The front side of stop 43 direction substantial middle before and after housing 311 is vertically extending.Spacing Device 43 is fixed on the left surface of housing 311.Stop 43 has the protuberance 431 highlighting downward from lower end. The lower end of protuberance 431 and the upper-end contact of the first extension 321.Protuberance 431 can move along the vertical direction Dynamic.Stop 43 has stage clip (omitting diagram) in inside.Protuberance 431 is exerted a force by stage clip downward.

The action of the driving means 31 when outlining user's operating pedal 22 (with reference to Fig. 1).Make User towards toe side operate pedal 22 when, connecting rod 21 (with reference to Fig. 1) moves downward.With connection The movement of bar 21, the leading section of the first extension 321 of bar 32 overcomes the active force of extension spring 42 to move downward Dynamic.First extension 321 observes the rotation in clockwise direction with axle portion 323 for fulcrum around from left surface. Axle portion 323 rotates with the rotation of the first extension 321.With the rotation in axle portion 323, the second extension 322 observe in direction rotation counterclockwise around from right flank with axle portion 323 for fulcrum.Extend with second The rotation in portion 322, magnet 33 moves towards front lower place from the state of Fig. 3.Therefore, with Hall element 34 as base The position of accurate magnet 33 changes.

When user operates pedal 22 towards heel side, connecting rod 21 moves upward.With connecting rod The movement of 21, the leading section of the first extension 321 of bar 32 overcome the stage clip of stop 43 active force and with Protuberance 431 together moves upward.First extension 321 is seen around from left surface with axle portion 323 for fulcrum Examine and rotate in direction counterclockwise.Axle portion 323 rotates with the rotation of the first extension 321.With axle The rotation in portion 323, the second extension 322 is observed in clockwise around from right flank with axle portion 323 for fulcrum Direction rotates.With the rotation of the second extension 322, magnet 33 moves towards back upper place from the state of Fig. 3. Therefore, the position of the magnet 33 on the basis of Hall element 34 changes.

Bar 32 is in the hole of the forward side that connecting rod 21 is fixed in two hole 321A of the first extension 321 When and connecting rod 21 all rotate in same slewing area when being fixed in the hole of side rearward.User in order to Power required for pedal 22 of stepping on is according to the fixing extension spring 42 in four groove 321B of the first extension 321 The position of groove and change.User is fixed on four for the power stepped on required for pedal 22 in extension spring 42 During the groove of the most forward side in individual groove 321B maximum, minimum when the groove of side the most rearward is fixed in extension spring 42.

As described above, Hall element 34 detect in the magnetic flux density of magnet 33 periphery orthogonal with datum plane Composition and to amplifier 35 output signal, amplifier 35 is after CPU45 (with reference to Fig. 5) output is amplified Signal.CPU45 is transfused to signal from amplifier 35.Magnet 33 periphery detected by Hall element 34 The composition orthogonal with datum plane in magnetic flux density is according to the position of the magnet 33 on the basis of Hall element 34 Put and change.Therefore, CPU45 is based on the signal inputting from amplifier 35, can uniquely determine with The position of the magnet 33 on the basis of Hall element 34, so that it is determined that the direction of operating of pedal 22 and operational ton. CPU45 determine user operate pedal 22 towards toe side when, defeated to drive circuit according to operational ton Go out signal, drive upper shaft motor 30 with rotary speed corresponding with operational ton.Therefore, sewing machine 1 stitches System.CPU45 determine user operate pedal 22 towards heel side when, drive tangent mechanism electromagnetism Element 60.The cutoff tool of tangent mechanism cuts off sewing thread with the driving of electromagnetic component 60.

The electrical structure of sewing machine 1 is described with reference to Fig. 5.Control device 16 has CPU45.CPU45 controls Sewing machine 1.CPU45 by bus and ROM46, RAM47, storage device the 48th, I/O interface (with Down referred to as " I/O ") 49 are connected.ROM46 storage is for performing the program etc. of sewing.RAM47 faces When storage in order to perform the various values needed for program.Storage device 48 is for storing the non-volatile of various value Property storage device.I/O49 electrically connects with drive circuit the 55th, drive circuit 56 and amplifier 35.Drive electricity Road 55 drives upper shaft motor 30 according to the driving signal inputting from CPU45.Drive circuit 56 is according to certainly The signal that drives of CPU45 input drives the electromagnetic component 60 of tangent mechanism.

Between magnet 33 when illustrating that user operates pedal 22 with reference to Fig. 6～Fig. 9 and Hall element 34 Position relationship.Hereinafter, in order to easy to understand, come in order to the relative position on the basis of the position of magnet 33 The position of the Hall element 34 when illustrating that the position of magnet 33 changes based on the operation of pedal 22.Fig. 6, What when the face of Fig. 8, Fig. 9 represents that the second extension 322 rotates, the left surface of the second extension 322 was passed through is flat Face, i.e. datum plane.Datum plane is orthogonal with the left and right directions of sewing machine 1.By the axle center in axle portion 323 with The crosspoint of datum plane is referred to as fulcrum 324.Hall element 34 is projected on perspective view picture during datum plane Center of gravity be referred to as the projection center of gravity of Hall element 34.User is operated pedal towards toe side or heel side Track on datum plane for the projection center of gravity of the Hall element 34 when 22 is referred to as track K.Track K is retouched The radius of the circular arc centered on fulcrum 324 drawn is referred to as radius R.Radius R is specially 25mm.To make The position of the projection center of gravity of the Hall element 34 during the non-operating pedal 22 of user is referred to as reference position 341.Will be even The bearing of trend of the straight line p of knot reference position 341 and fulcrum 324 is referred to as P direction.

The length of the long side direction of magnet 33 is referred to as length ML, the length of short side direction is referred to as length MS.Length ML is specially 13mm, and length MS is specially 12mm.Magnet 33 magnetizes along short side direction. The direction of magnetization of magnet 33 is parallel with datum plane, and with directly in the state of the non-operating pedal of user 22 Observe to tilt in clockwise direction towards from right flank on the basis of line p.Hereinafter, the magnetization side by magnet 33 It is referred to as Q direction to (i.e. the short side direction of magnet 33).The degree tilting, i.e. user does not operates and steps on Angle Mm of the angle between P direction during plate 22 and Q direction is specially 27.38 °.Reference position 341 exists It is positioned at the central authorities in the Q direction of magnet 33 in the state of the non-operating pedal of user 22.Magnetization from magnet 33 The both ends in direction are to reference position 341, and on Q direction, respective length is equal, are the one of length MS Half length, i.e. MS/2.

Magnet 33 is parallel with datum plane and is respectively provided with magnetic different from each other at the both ends of the direction of magnetization Pole.The side away from axle portion 323 in the end of the direction of magnetization of magnet 33, i.e. Fig. 6, Fig. 8, Fig. 9 is each From upside be N pole.The side in the close axle portion 323 in the end of the direction of magnetization of magnet 33, i.e. Fig. 6, The respective downside of Fig. 8, Fig. 9 is S pole.Hereinafter, by direction (the i.e. long limit of magnet 33 orthogonal with Q direction Direction) it is referred to as R direction.Straight line r will be referred to as by reference position 341 and the straight line extending along R direction.As Upper described, reference position 341 is positioned at the Q direction of magnet 33 in the state of the non-operating pedal of user 22 Central authorities.Therefore, the central authorities of the direction of magnetization at magnet 33 for the straight line r extend along R direction.

Bar 32, when user operates pedal 22 towards toe side, is observed in counterclockwise around from right flank Direction rotates.Now, the projection center of gravity of Hall element 34 on track K from reference position 341 to arrow Ka Direction is moved.Operate pedal user from the state of non-operating pedal 22 towards toe side to greatest extent It when 22, if the amount of movement of the projection center of gravity of Hall element 34 is converted into the rotational angle of bar 32, it is 13.03 °. Hereinafter, the projection weight of the Hall element 34 when user being operated to greatest extent pedal 22 towards toe side The position of the heart is referred to as primary importance 342.Primary importance 342 on Q direction from reference position 341 towards N pole side Leave 2.61mm.Hereinafter, straight line ra will be referred to as by primary importance 342 and the straight line extending along R direction.

When user operates pedal 22 towards heel side, bar 32 is observed in clockwise around from right flank Direction rotates.Now, the projection center of gravity of Hall element 34 on track K from reference position 341 to arrow Kb Direction is moved.Operate pedal user from the state of non-operating pedal 22 to heel side to greatest extent When 22, if the amount of movement of the projection center of gravity of Hall element 34 is converted into the rotational angle of bar 32, for- 7.32°.Hereinafter, the Hall element 34 when user being operated to greatest extent pedal 22 towards heel side The position of projection center of gravity is referred to as the second place 343.The second place 343 on Q direction from reference position 341 court 1.47mm is left in S pole side.Hereinafter, will be referred to as straight by the second place 343 and the straight line extending along R direction Line rb.

The radius R of the circular arc that angle Mm, length ML of magnet, MS, track K are depicted and making User from the state of non-operating pedal 22 towards toe side or heel side operate pedal 22 to greatest extent when Rotational angle is all not limited to above-mentioned concrete example.

When user operates pedal 22 towards toe side or heel side, position on Q direction for the track K Displacement between straight line ra and straight line rb.Now, the projection center of gravity of Hall element 34 with magnet 33 as base Accurate relative position is at least at the region intrinsic displacement of middle body of the direction of magnetization (Q direction) of magnet 33. The region of middle body specifically represent magnet 33 on Q direction from straight line r to N pole side and S pole The region between the straight line of length MS/4 is respectively left in side.That is, the region representation magnet 33 of middle body The region of a length of length MS/2 of the central authorities of the direction of magnetization and the direction of magnetization.

Fig. 7 is the simulation result of the composition orthogonal with datum plane in magnetic flux density B of magnet 33 periphery Curve map.In order to easy to understand, in simulations, calculate the magnetic flux density after magnet 33 surface planarisation. The distance in the Q direction when transverse axis of curve map is that the end by N pole side on magnet 33 surface is set to benchmark 0 X (unit: mm).The direction gone from the extremely lateral S pole side of the N of magnet 33 is positive direction, from the extremely lateral N of S The direction that pole side is gone is negative direction.The longitudinal axis of curve map be the centre in the R direction of magnet 33 be positioned at magnetic At place on the left side on body 33 surface and the direction vertical with magnet 33 surface, magnetic flux density B and base The orthogonal composition of directrix plane (unit: mT).Seven curves of curve map (Z=0.5mm, 1.0mm ... Distance Z away from magnet 33 surface on 3.5mm) vertical with magnet 33 surface on the left of magnet 33 surface direction Different.As the surface that the Z=0.0mm of the benchmark of distance Z is magnet 33.Hereinafter, will be with magnet The vertical direction in the surface of 33 is referred to as U direction.U direction is corresponding with the left and right directions of sewing machine 1.As above institute Stating, between magnet 33 and Hall element 34, the distance at left and right directions (U direction) is 2.0mm.Therefore, Corresponding curve represents actually detected magnetic flux density B arriving of Hall element 34 with Z=2.0mm.

As it is shown in fig. 7, be of about more than 3mm and the magnetic flux of about 9mm area below E1 with distance X Density B is compared, every list of magnetic flux density B in the region less than about 3mm or more than about 9mm for distance X The distance of positions from variable quantity, i.e. the absolute value of slope of a curve is bigger.Particularly, magnetic flux density B is every single The distance of positions from variable quantity be reduced to 0.5mm with distance Z from 3.5mm and significantly become big.Distance X is of about The variable quantity of the per unit distance of magnetic flux density B of more than 3mm and about 9mm area below E1 is relatively Little, unrelated with distance Z.The per unit distance of magnetic flux density B of region E1 be changed to substantial linear.Magnetic The variable quantity of the per unit distance of magnetic flux density B of body 33 periphery is less at the region E1 of middle body, with The two ends near the direction of magnetization (Q direction) and become big.

The projection center of gravity of Hall element 34 distance X be more than 3.39mm (position of straight line ra) and Relative movement in 7.47mm (position of straight line rb) area below E2.Hall element 34 is at magnet 33 The less region E1 of specific permeability B variable quantity is relative closer to the part of the direction of magnetization (Q direction) central authorities Mobile.Therefore, for driving means 31, at the magnet 33 on the basis of Hall element 34 in U direction Position owing to the timeliness of bar 32 deteriorates when there occurs change, can be by detected by Hall element 34 The change of magnetic flux density B suppresses in Min..

It is of about compared with magnetic flux density B of more than 3mm and about 9mm area below E1 with distance X, Magnetic flux density B in the region less than about 3mm or more than about 9mm for distance X is for each distance Z Its difference amount is bigger.Particularly, difference amount for each distance Z for magnetic flux density B with distance Z from 3.5mm is reduced to 0.5mm and significantly becomes big.Distance X is of about more than 3mm and the district of about below 9mm Magnetic flux density B of territory E1 is substantially uniform, unrelated with distance Z.Therefore, magnetic flux density B of magnet 33 periphery In the E1 of region substantially uniform.The difference amount of magnetic flux density B for each distance Z is with near magnetization The two ends in direction (Q direction) and become big.

The projection center of gravity of Hall element 34 magnet 33 than region E1 closer to the direction of magnetization (Q direction) Central authorities part relative movement, magnetic flux density B in the E1 of region is substantially uniform, unrelated with distance Z. Therefore, driving means 31 at the magnet 33 on the basis of Hall element 34 in the position in U direction due to bar 32 Timeliness deteriorate and when there occurs change, can be by the change of magnetic flux density B detected by Hall element 34 Change suppression in Min..

Distance X be magnetic flux density B at 6mm be 0, unrelated with distance Z.Reason is, distance X is 6mm When, the distance at the both ends of the direction of magnetization away from magnet 33 is equal, and therefore the polarity of magnetic flux density B is at this Place inverts.Position (the benchmark position of the projection center of gravity of the Hall element 34 during the non-operating pedal 22 of user Put 341) it is central authorities' (with reference to Fig. 6) of the direction of magnetization of magnet 33.Therefore, at the non-operating pedal of user When 22, the magnetic field detected by Hall element 34 is 0, unrelated with distance Z.

As shown in Figure 8, the tangent line c1 at primary importance 342s and the straight line q extending along Q direction of track K Between the acute angle A1 of angle be specially 76.97 °.The tangent line c2 at second place 343s of track K and straight The acute angle A2 of the angle between line q is specially 82.68 °.Therefore, the tangent line of all points on track K and The acute angle A of the angle between Q direction takes the value of 76.97 °～82.68 ° all the time.Therefore, owning on track K Tangent line at Dian intersects with Q direction (direction of magnetization) all the time.That is, the tangent line on any point on track K All inconsistent with Q direction (direction of magnetization).

As it is shown in fig. 7, the variable quantity of the per unit distance of magnetic flux density B of magnet 33 periphery is at region E1 Less, in region, E2 is less.Magnetic flux density B of magnet 33 periphery is substantially uniform at region E1, with distance Z Unrelated, in region, E2 uniformity is more preferable.It is therefore preferable that the projection center of gravity of Hall element 34 is in the E1 of region Relative movement, more preferably relative movement in the E2 of region.As described above, at any point on track K Tangent line is all inconsistent with Q direction.That is, the tangent line at any point on track K is all got along well orthogonal with Q direction R direction orthogonal.As shown in Figure 8, track K is in the side tilting from straight line ra, the rb extending along R direction Upwardly extend.Now, for the length of the track K in the E2 of region, and on any point on track K The tangent line state consistent with Q direction, i.e. the shape that track K extends along the direction orthogonal with straight line ra, rb State is compared and to be grown.

As it is shown in figure 9, moving direction on track K for the projection center of gravity of Hall element 34 (arrow Ka, The direction of Kb indication) can define as follows.By the tangent line s's at 341s, reference position of track K Bearing of trend is referred to as S direction.The arrow away from the direction of fulcrum 324 pointing in Q direction is referred to as arrow Tq.The direction of the arrow Ka indication in S direction be with arrow Tq towards the direction acutangulating A3.S side The direction of the arrow Kb indication in be with arrow Tq towards the direction becoming obtuse angle A4.

Now, the bearing of trend of the tangent line on track K is as the projection center of gravity of Hall element 34 is at track K On mobile and tend to R to primary importance 342 (that is, the direction to arrow Ka indication) from reference position 341 Direction.Q direction and R direction are orthogonal.Therefore, the projection center of gravity of Hall element 34 per unit on Q direction The amount of movement of time, when bar 32 rotates with constant angular speed, moves on track K with projecting center of gravity And diminish near primary importance 342.

As it is shown in fig. 7, the variable quantity of the per unit distance of magnetic flux density B of magnet 33 periphery is with distance X Central authorities' (distance X=6mm, corresponding with reference position 341) in self-magnetization direction (Q direction) are near end Portion's (distance X=0mm, corresponding with primary importance 342) and become big.Therefore, user towards toe side During operating pedal 22, the minimizing of the amount of movement in Q direction for the relative position of the projection center of gravity of Hall element 34 Change with magnetic flux density B causing near primary importance 342 due to the projection center of gravity of Hall element 34 The increase of amount offsets.Now, the variation tendency of magnetic flux density B detected by Hall element 34 is close Substantial linear.CPU45 can determine the operational ton of pedal 22 based on the signal of substantial linear change.

The bearing of trend of the tangent line on any point on track K with Hall element 34 projection center of gravity in-orbit Move to the second place 343 (that is, the direction to arrow Kb) from reference position 341 on mark K and tend to Q Direction.Therefore, the amount of movement of projection center of gravity time per unit on Q direction of Hall element 34 is at bar 32 Move on track K and near the second place 343 with projecting center of gravity when rotating with constant angular speed Become big.

As it is shown in fig. 7, the variable quantity of the per unit distance of magnetic flux density B of magnet 33 periphery is with distance X Central authorities' (distance X=6mm, corresponding with reference position 341) in self-magnetization direction (Q direction) are near end Portion's (distance X=12mm, corresponding with the second place 343) and become big.Therefore, user towards heel During the operating pedal 22 of side, the amount of movement in Q direction for the relative position of the projection center of gravity of Hall element 34 increases. The variable quantity of magnetic flux density B increases according to the increase of amount of movement.Now, detected by Hall element 34 Magnetic flux density B strongly reduce when user operates pedal towards heel side that (numerical value becomes negative, from number To reduce from the point of view of aspect, but in terms of absolute value from the point of view of be increased).CPU45 is in user court Tangent mechanism is driven to cut off sewing thread when heel side operates pedal 22.For the electromagnetism to tangent mechanism The signal that element 60 is driven exports when user operates pedal 22 with ormal weight towards heel side.Cause This, CPU45 does not needs to determine linearly the behaviour of pedal 22 when user operates pedal 22 towards heel side Measure.

With reference to Figure 10, magnet 33 is described.For ease of explanation, it is assumed that Hall element 34 is on the basis of magnet 33 Illustrate towards arrow Ka side or arrow Kb side relative movement.Hall element 34 court on the basis of magnet 33 During arrow Ka side relative movement, actually magnet 33 is towards side (the arrow Kb contrary with arrow Ka Side) mobile.Hall element 34 on the basis of magnet 33 towards arrow Kb side relative movement when, actually magnetic Body 33 is mobile towards the side (arrow Ka side) contrary with arrow Kb.

Magnet 33 has the surface 33A relative with Hall element 34.Magnet 33 has smooth at surface 33A Part 331 and sloping portion 332.Flat 331 and datum plane 51 are in same plane, from magnet 33 R direction substantial middle extend to the end 333 of arrow Ka side.Sloping portion 332 is towards datum plane 51 Left side, i.e. the lopsidedness away from Hall element 34.Sloping portion 332 is big from the R direction of magnet 33 Cause central authorities and extend to the end 334 of arrow Kb side.Therefore, the surface 33A of magnet 33 and Hall element 34 Between in substantial middle from the R direction of magnet 33 of the distance of U direction (left and right directions) towards end 334 It is gradually increased.The thickness of the end 334 of magnet 33 is the big of the thickness of the substantial middle in the R direction of magnet 33 Cause half.

With the projection center of gravity of Hall element 34 on track K (with reference to Fig. 6, Fig. 8, Fig. 9) towards arrow Kb side shifting and close to the second place 343 from reference position 341, the surface 33A of magnet 33 and Hall unit Distance between part 34 becomes big.As it is shown in fig. 7, the projection center of gravity of Hall element 34 is positioned at reference position 341 And when between the second place 343, magnetic flux density B of magnet 33 periphery with magnet 33 and Hall element 34 it Between distance Z in U direction become big and trend towards 0.

As it is shown in figure 9, the projection center of gravity making Hall element 34 towards heel side operating pedal 22 user The amount of movement in Q direction for relative position when increasing, magnetic flux density B detected by Hall element 34 is drastically Reduce (numerical value becomes negative, in terms of mathematics from the point of view of be to reduce, but in terms of absolute value from the point of view of be increase Big).But, the distance between the surface 33A of magnet 33 and Hall element 34 is in the throwing of Hall element 34 Shadow center of gravity is big to being positioned at time-varying reference position 341 and the second place 343 from reference position 341.Therefore, When user operates pedal towards heel side, magnetic flux density B detected by Hall element 34 will not be anxious Reduce sharply little (numerical value becomes negative, in terms of mathematics from the point of view of be to reduce, but in terms of absolute value from the point of view of be Increase).

As described above, when driving means 31 makes bar 32 rotate according to the operation of pedal 22, be fixed on second The magnet 33 of extension 322 is moved, and the position relationship between magnet 33 and Hall element 34 becomes Change.Now, when observing magnet 33 and Hall element 34 from the direction vertical with datum plane, with magnet 33 On the basis of region E1 (with reference to Fig. 7) inner side of the direction of magnetization at magnet 33 of the position of Hall element 34 Region E2 (with reference to Fig. 7) in move.Region E2 be proximate to the direction of magnetization of magnet 33 central authorities, The less region of change in magnetic flux density (with reference to Fig. 7).In region E1, E2, on the basis of magnet 33 When the position of Hall element 34 there occurs change on the direction (Q direction) parallel with datum plane, because of The change of the magnetic flux density that change in location causes is less.In region E1, E2, on the basis of magnet 33 When the position of Hall element 34 there occurs change on the direction (U direction) vertical with datum plane, because of The change of the magnetic flux density that change in location causes is less.Driving means 31 can deteriorate in bar 32 timeliness and lead Cause the position of magnet 33 when there occurs change in the u-direction, by close for the magnetic flux detected by Hall element 34 The change of degree suppresses in Min..Driving means 31 also can export to CPU45 when bar 32 timeliness deteriorates Can stably determine the signal of the operational ton of pedal 22.Therefore, sewing machine when bar 32 timeliness deteriorates also Can stably sew.

Magnet 33 side of magnetization less than region E1 for the length of magnet 33 direction of magnetization of the region E2 of magnet 33 To length.Now, the projection center of gravity of Hall element 34 and the shape of magnet 33 and characteristic are all the time independently Relative movement in the less region of change in magnetic flux density.Therefore, driving means 31 can be with magnet 33 Shape and characteristic independently, can accurately determine the signal of the operational ton of pedal 22 to CPU45 output.

As shown in Figure 8, the folder between the tangent line of all points on track K and the direction of magnetization (Q direction) The acute angle at angle takes the value between acute angle A1 (76.97 °) and acute angle A2 (82.68 °) all the time.Acute angle A1 is Angle between tangent line c1 at primary importance 342 and straight line q.Acute angle A2 is cutting at the second place 343 Angle formed by line c2 and straight line q.Therefore, the tangent line of all points on track K is handed over the direction of magnetization all the time Fork.Track K tilts from straight line ra, rb.Now, in the E2 of region, the length of track K and track K and Straight line ra, rb compare when orthogonal and to grow.Therefore, driving means 31 is relatively big at the operational ton of pedal 22, bar When the slewing area of 32 is bigger, also can determine the signal of the operational ton of pedal 22 to CPU45 output.

As it is shown in figure 9, when user operates pedal 22 towards toe side, Hall element 34 is towards making rail The direction of magnetization of the bearing of trend of the tangent line on mark K and magnet 33 tends to orthogonal direction relative movement.This When, in the projection center of gravity of Hall element 34 near primary importance 342, the magnetic flux detected by Hall element 34 When the variable quantity of density increases, Hall element 34 reduces at the amount of movement of the direction of magnetization (Q direction).Magnetic The reduction of the increase of the variable quantity of flux density and the amount of movement in the direction of magnetization for the Hall element 34 offsets.Suddenly The trend of the change of your magnetic flux density B detected by element 34 is close to substantial linear.Therefore, CPU45 When the signal of amplifier 35 input based on automatic drive device 31 determines the operational ton of pedal 22, Neng Gouji The magnetic flux density changing in substantial linear determines operational ton, therefore, it is possible to stably determine the behaviour of pedal 22 Measure.

When user operates pedal 22 towards heel side, Hall element 34 is towards the tangent line making on track K Bearing of trend tend to parallel direction relative movement with the direction of magnetization of magnet 33.Now, Hall element The variable quantity of the magnetic flux density detected by 34 is because the projection center of gravity of Hall element 34 is near the second place 343 And increase.Hall element 34 at the amount of movement of the direction of magnetization (Q direction) because of the projection weight of Hall element 34 The heart increases near the second place 343.CPU45, when user operates pedal 22 towards heel side, drives Tangent mechanism and cut off sewing thread.CPU45 is when user operates pedal 22 towards heel side, it is not necessary to Determine the operational ton of pedal 22 linearly.Therefore, driving means 31 is at bar 32 timeliness deterioration magnet 33 When position there occurs change, also can not be exported for driving cutting machine to CPU45 with being affected by timeliness deterioration The signal of the electromagnetic component 60 of structure.In the present embodiment, user can be made to operate towards toe side to step on The rate of travel of the Hall element 34 during plate 22 is more than Hall element when operating pedal 22 towards heel side The rate of travel of 34.

Magnet 33 is provided with rake (sloping portion 332) at surface 33A.The surface 33A of magnet 33 and suddenly The projection that distance between your element 34 operates pedal 22 user towards heel side and makes Hall element 34 Center of gravity is big to being positioned at time-varying reference position 341 and the second place 343 from reference position 341.Therefore, drive Dynamic device 31 can suppress magnetic flux density B detected by Hall element 34 strongly reduce (numerical value becomes negative, To reduce from the point of view of in terms of mathematics, but in terms of absolute value from the point of view of be increased).

As shown in Figure 6, when the non-operating pedal 22 of user, the position of the projection center of gravity of Hall element 34 (reference position 341) is positioned at the central authorities of the direction of magnetization of magnet 33.Now, detected by Hall element 34 Magnetic flux density B be 0.Magnet 33 departing from bar 32 when, the magnetic flux density detected by Hall element 34 B is 0, unrelated with the operating position of pedal 22.Therefore, CPU45 is in the amplification based on automatic drive device 31 When the magnetic flux density that the signal of device 35 input is determined is 0, carry out stopping the control of sewing.Now, energy Enough prevent sewing machine 1 from sewing when magnet 33 is departing from bar 32.

The present invention is not limited to above-mentioned embodiment.The track K of the projection center of gravity of Hall element 34 is also permissible In the E1 of region, i.e. move in the region of half length MS/2 of direction of magnetization length MS of magnet 33 Dynamic.If the change substantial linear of the per unit distance of magnetic flux density B in the direction of magnetization of magnet 33, The projection center of gravity of Hall element 34 also can be in half length MS of direction of magnetization length MS than magnet 33 Move in/2 long regions.

Acute angle A1, A2 of Fig. 8 is respectively 76.97 °, 82.68 °.Preferably acute angle A1, A2 all levels off to 90 °. Reason is, acute angle A1, A2 level off to 90 ° when, prolong along the direction orthogonal with straight line ra, rb with track K The state stretched is compared, and the length that can make track K in the E2 of region is longer.

The bearing of trend of the tangent line at any point on track K in Fig. 8 also can be with the direction of magnetization (Q side To) parallel.That is, the tangent line at any point on track K also can not intersect with straight line q.Primary importance 342nd, the bearing of trend of the tangent line at the second place 343 also can be parallel with the direction of magnetization (Q direction).

The Hall unit on the basis of magnet 33 when user operates pedal 22 towards toe side, in Fig. 9 The relative position of the projection center of gravity of part 34 also can be towards arrow Kb side shifting.Operate towards heel side user During pedal 22, the relative position of the projection center of gravity of the Hall element 34 on the basis of magnet 33 in Fig. 9 is also Can be towards arrow Ka side shifting.

When the non-operating pedal 22 of user, the throwing of the Hall element 34 on the basis of magnet 33 in Fig. 6 The position (reference position 341) of shadow center of gravity also may be located at the ratio direction of magnetization (Q direction) of magnet 33 The position of N pole side or S pole side is leaned on by central authorities.

Amplifier 35 also can determine the direction of operating of pedal 22 based on the signal inputting from Hall element 34 And operational ton.Amplifier 35 also can represent the direction of operating that determines and operational ton to CPU45 output Signal.CPU45 also can be based on the signal control representing direction of operating and operational ton inputting from amplifier 35 Machine for sewing 1.Also can use the Magnetic Sensor of Hall element 34 and amplifier 35 integration, i.e. Hall IC.

Magnet 33 has flat 331 and sloping portion 332 at surface 33A but it also may does not have and inclines Oblique part 332, and only flat 331.

When sewing machine 1 has the presser feet up-down mechanism making presser feet 17 move up and down, CPU45 also may be used To make presser feet transport about 17 when user operates pedal 22 towards toe side according to the operational ton of pedal 22 Dynamic.Pedal 22 also can be only capable of towards toe side operation.Now, sewing machine 1 can arrange separately and can be given For driving the operating portion of the instruction of tangent mechanism.

Driving means 31 is an example of the driving means of the sewing machine of the present invention.Amplifier 35 is this One example of bright output unit.Upper shaft motor the 30th, electromagnetic component 60 is of the drive division of the present invention Example.

Claims (12)

1. the driving means (31) of a sewing machine, comprising:

Bar (32), it rotates within the limits prescribed according to the operation of pedal (22)；

Magnet (33), it is fixed on above-mentioned bar, moves with the rotation of above-mentioned bar；

Hall element (34), which is the element in the magnetic field detecting above-mentioned magnet, adjoint with above-mentioned magnet The different position of plane that the rotation of above-mentioned bar is passed through is relative with above-mentioned magnet；And

Output unit (35), its based on detected by above-mentioned Hall element with and the position pair of above-mentioned magnet Magnetic field on the vertical direction of the above-mentioned plane answered, output is used for driving the drive division of sewing machine (1) (the 30th, 60) signal；

The driving means of this sewing machine is characterised by,

Above-mentioned magnet is parallel with above-mentioned plane and is respectively provided with different from each other at the both ends of the direction of magnetization Magnetic pole；

When rotating in the range of above-mentioned bar is in above-mentioned regulation, on the direction vertical with above-mentioned plane is observed Stating magnet and above-mentioned Hall element, the relative position of the above-mentioned Hall element on the basis of above-mentioned magnet is upper Move in the range of the middle body of the direction of magnetization stating magnet.

2. the driving means of sewing machine according to claim 1, it is characterised in that

The length of the above-mentioned direction of magnetization of the scope of above-mentioned middle body is less than the above-mentioned magnetic pole of above-mentioned magnet Between the half of length.

3. the driving means of sewing machine according to claim 1, it is characterised in that

The scope of above-mentioned middle body be with and the vertical side of the corresponding above-mentioned plane in position of above-mentioned magnet The scope of magnetic field linear change upwards.

4. the driving means of the sewing machine according to according to any one of claims 1 to 3, it is characterised in that

When above-mentioned magnet moves, the extension side of the tangent line on the track of the relative position of above-mentioned Hall element Intersect with the above-mentioned direction of magnetization to all the time.

5. the driving means of sewing machine according to claim 4, it is characterised in that

Above-mentioned drive division have drive the upper shaft (14) of sewing machine and make that shank (7) moves up and down upper Axle motor (30)；

It is positioned at the central authorities of the above-mentioned direction of magnetization of above-mentioned magnet at above-mentioned Hall element from above-mentioned Hall element State tend to orthogonal direction relative movement to the bearing of trend making above-mentioned tangent line and the above-mentioned direction of magnetization When, the output of above-mentioned output unit is for driving the signal of above-mentioned upper shaft motor.

6. the driving means of sewing machine according to claim 4, it is characterised in that

Above-mentioned drive division has the electromagnetic component (60) of the tangent mechanism of sewing machine, the tangent line of this sewing machine Mechanism is used for cutting off sewing thread；

It is positioned at the central authorities of the above-mentioned direction of magnetization of above-mentioned magnet at above-mentioned Hall element from above-mentioned Hall element State to making the bearing of trend of above-mentioned tangent line and the above-mentioned direction of magnetization tend to parallel direction relative movement When, the output of above-mentioned output unit is for driving the signal of above-mentioned electromagnetic component.

7. the driving means of sewing machine according to claim 5, it is characterised in that

Above-mentioned drive division has the electromagnetic component of the tangent mechanism of sewing machine, and the tangent mechanism of this sewing machine is used In cut-out sewing thread；

It is positioned at the central authorities of the above-mentioned direction of magnetization of above-mentioned magnet at above-mentioned Hall element from above-mentioned Hall element State to making the bearing of trend of above-mentioned tangent line and the above-mentioned direction of magnetization tend to parallel direction relative movement When, the output of above-mentioned output unit is for driving the signal of above-mentioned electromagnetic component.

8. the driving means of the sewing machine according to according to any one of claims 1 to 3, it is characterised in that

When observing above-mentioned magnet and above-mentioned Hall element from the direction vertical with above-mentioned plane, do not operate above-mentioned The relative position of the above-mentioned Hall element on the basis of above-mentioned magnet during pedal is positioned at the magnetic of above-mentioned magnet Change the central authorities in direction.

9. the driving means of sewing machine according to claim 4, it is characterised in that

When observing above-mentioned magnet and above-mentioned Hall element from the direction vertical with above-mentioned plane, do not operate above-mentioned The relative position of the above-mentioned Hall element on the basis of above-mentioned magnet during pedal is positioned at the magnetic of above-mentioned magnet Change the central authorities in direction.

10. the driving means of sewing machine according to claim 5, it is characterised in that

When observing above-mentioned magnet and above-mentioned Hall element from the direction vertical with above-mentioned plane, do not operate above-mentioned The relative position of the above-mentioned Hall element on the basis of above-mentioned magnet during pedal is positioned at the magnetic of above-mentioned magnet Change the central authorities in direction.

The driving means of 11. sewing machines according to claim 6, it is characterised in that

When observing above-mentioned magnet and above-mentioned Hall element from the direction vertical with above-mentioned plane, do not operate above-mentioned The relative position of the above-mentioned Hall element on the basis of above-mentioned magnet during pedal is positioned at the magnetic of above-mentioned magnet Change the central authorities in direction.

The driving means of 12. sewing machines according to claim 7, it is characterised in that

When observing above-mentioned magnet and above-mentioned Hall element from the direction vertical with above-mentioned plane, do not operate above-mentioned The relative position of the above-mentioned Hall element on the basis of above-mentioned magnet during pedal is positioned at the magnetic of above-mentioned magnet Change the central authorities in direction.