CN1861882B

CN1861882B - Middle foot-pressing device for sewing machine

Info

Publication number: CN1861882B
Application number: CN2006100778831A
Authority: CN
Inventors: 三须伸介
Original assignee: Juki Corp
Current assignee: Juki Corp
Priority date: 2005-05-10
Filing date: 2006-05-10
Publication date: 2011-09-07
Anticipated expiration: 2026-05-10
Also published as: CN1861882A; TW200706727A; KR20060116710A; JP2006314391A; KR101267428B1; TWI363114B; JP4860178B2

Abstract

The related middle presser foot device for sewing machine comprises: the middle presser foot, a main shaft to drive needle and foot moving up-and-down, a drive motor for the shaft, a regulation axis to regulate height of the foot to lower dead point, a drive motor for last axis, an operation unit to input the lower dead point, a memory to store lower-dead point height and yarn trace data, and a control unit to store the limit value as the dead point height when the former dead-point height over limit value. This invention can avoid device damage.

Description

The middle foot device of Sewing machines

Technical field

The figures that the present invention relates to embroider forms the middle foot device of the Sewing machines of making.

Background technology

In the past, utilize frame shape cloth keep body keep cloth and by on one side in the horizontal direction (X-Y direction) carry eedle connected in the Sewing machines of making in the frame of cloth maintenance body, in order to prevent when eedle rises, cloth is pushed the middle foot device of the eedle breakthrough part periphery of cloth downwards because of rising with the friction of eedle when the rising that is provided with on the part of leaving the frame portion that keeps body at eedle.

Should in foot device, normally by middle presser feet cloth is pushed downwards when cloth rises at eedle, from the cloth fully after the rising, middle presser feet and eedle together rise at eedle.

As so middle foot device, known have a kind of to presser feet in making up and down the swing fulcrum of moving pendular body carry out the displacement adjustment, thereby can adjust apart from the structure (for example, with reference to patent documentation 1) of the middle presser feet height (bottom dead centre height) of needle plate.

And, in recent years, known have a kind of so middle foot device, this device handle uses as stitch data about the middle presser feet altitude information and the stitching data of the bottom dead centre height of middle presser feet, the amount of moving up and down that the thickness adjustment of the materials of making by correspondence such as cloth is made the middle presser feet in the action, thus can carry out high efficiency making.

[patent documentation 1] spy opens clear 63-296783 communique

In above-mentioned middle foot device, according to making specification, also need to carry out the adjustment of shank height sometimes, but according to adjusted shank height, the lower end of shank is arranged in the position lower than the bottom dead centre height of presser feet sometimes.Presser feet 203 does not form the state of interfering with shank 204 in when Figure 17 is illustrated in eedle 201 and has connected cloth 202, yet Figure 18 is illustrated in the eedle 201a that lack than eedle 201 when having connected cloth 202a, and the state that conflicts has taken place for middle presser feet 203 and shank 204.As shown in Figure 18, when being installed in short eedle 201a on the shank 204, though the lower end of shank 204 must drop to the position of dotted line P, but because a side of the bottom dead centre height of presser feet 203 is higher in actual, institute so that should move is hindered, and causes thus and the conflicting of middle presser feet 203.If shank and middle presser feet clash, the damage of presser feet or shank in then can causing.

Summary of the invention

The objective of the invention is to prevent the damage of middle presser feet or shank by the interference of presser feet in suppressing and shank.

Other purposes of the present invention are that the setting by the bottom dead centre height of presser feet in simplifying improves operating efficiency.

The middle foot device of the present invention's 1 Sewing machines comprises: with the main shaft of motor of sewing machine interlock rotation; The eedle that moves up and down linkedly with the rotation of main shaft; The middle presser feet that moves up and down linkedly with the rotation of main shaft; By displacement regulate described in the adjusting parts apart from the height of needle plate of presser feet when arriving bottom dead centre; Make the CD-ROM drive motor of described adjusting parts displacement; Import the operating unit of the bottom dead centre height of described middle presser feet; The storage part that described bottom dead centre height in the described operating unit and stitching data are together preserved will be input to; With according to being stored in described bottom dead centre height and stitching data in the described storage part, control the control module of described motor of sewing machine and described CD-ROM drive motor, it is characterized in that:

Described control module, to be used for described bottom dead centre limitation in height is the limits value that is not higher than the lower end position of described shank, compare with the described bottom dead centre height that is input in the described operating unit, bottom dead centre height in described input surpasses under the situation of described limits value, described limits value as the bottom dead centre height, is controlled described CD-ROM drive motor.

The middle foot device of the present invention's 2 Sewing machines comprises: with the main shaft of motor of sewing machine interlock rotation; The eedle that moves up and down linkedly with the rotation of main shaft; The middle presser feet that moves up and down linkedly with the rotation of main shaft; By displacement regulate described in the adjusting parts apart from the height of needle plate of presser feet when arriving bottom dead centre; Make the CD-ROM drive motor of described adjusting parts displacement; Import the operating unit of the bottom dead centre height of described middle presser feet; The storage part that described bottom dead centre height in the described operating unit and stitching data are together preserved will be input to; With according to being stored in described bottom dead centre height and stitching data in the described storage part, control the control module of described motor of sewing machine and described CD-ROM drive motor, it is characterized in that:

Described control module, to be used for described bottom dead centre limitation in height is the limits value that is not higher than the lower end position of described shank, compare with the described bottom dead centre height that is input in the described operating unit, replace the described bottom dead centre height of being imported with described limits value, and it is kept in the described storage part.

(invention effect)

According to the present invention 1 because under the situation of bottom dead centre height, limits value is controlled CD-ROM drive motor as the bottom dead centre height greater than limits value, so, in can preventing to make in the bottom dead centre height of presser feet surpass limits value.Thus, because presser feet is positioned at the position lower than the lower end of shank in the process of making, thus can not form interference between middle presser feet and the shank, thus the damage of middle presser feet or shank can be prevented.

According to the present invention 2, because when being input to the bottom dead centre height in the operating unit, if this bottom dead centre height has surpassed limits value, then this limits value is saved in the storage part as the bottom dead centre height of being imported, so, can prevent when making in the bottom dead centre height of presser feet surpass limits value, and, the Data Update that does not need to carry out at storage part is operated, thereby can improve operating efficiency.

Description of drawings

Fig. 1 is the stereogram of expression Sewing machines of the present invention.

Fig. 2 is the maintenance frame of expression Sewing machines of the present invention and near the amplification stereogram the middle presser feet.

Fig. 3 is the front view before the middle presser feet height of middle foot device is regulated.

Fig. 4 is the exploded perspective view of middle foot device.

Fig. 5 is other exploded perspective view of middle foot device.

Fig. 6 is the side view of keeping out of the way mechanism's (keep out of the way before) of presser feet in the explanation.

Fig. 7 be in the explanation presser feet keep out of the way mechanism's side view of (in keeping out of the way).

Fig. 8 is the side view of keeping out of the way mechanism's (keep out of the way back) of presser feet in the explanation.

Fig. 9 is the front view after the middle presser feet height of middle foot device is regulated.

Figure 10 is the vertical view of the guidance panel of expression Sewing machines.

Figure 11 is the key diagram of making graph data in the expression Sewing machines.

Figure 12 is that expression is according to making the key diagram of handle the needle (the stitching shape) of graph data.

Figure 13 is the key diagram of the programme diagram graphic data in the expression Sewing machines.

Figure 14 is the block diagram of the control device of expression Sewing machines.

Figure 15 is the flow chart of the action of expression Sewing machines of the present invention.

Figure 16 is that the making of Sewing machines of expression the 2nd embodiment handled the flow chart that moves.

Figure 17 is a key diagram of representing the position relation in the lowest positions of the middle presser feet of Sewing machines in the past and shank.

Figure 18 is a key diagram of representing the position relation in the lowest positions of the middle presser feet of Sewing machines in the past and shank.

Among the figure: foot device among the 1-; The 2-main shaft; 2a-Spindle Motor (motor of sewing machine); Presser feet among the 29-; The 34-guide member; The 39-regulating shaft; Presser feet motor (CD-ROM drive motor) among the 42-; 70-ROM; 71-RAM; 72-EEPROM (storage part); 73-CPU; 76a-X week CD-ROM drive motor; The 77a-Y shaft drive motor; 100-electronic cycle sewing machine (Sewing machines); The 108-eedle; 111-keeps frame; The 113-installing component; 1000-control device (control module).

The specific embodiment

[the 1st embodiment]

(overall structure of electronic cycle sewing machine)

In conjunction with Fig. 1～Figure 16 the 1st embodiment of the present invention is described.

In the present embodiment, as Sewing machines, illustrate electronic cycle sewing machine.Electronic cycle sewing machine has the maintenance frame as the cloth maintaining part, this maintenance frame is used to keep the conduct of making to make the cloth of thing, by making this maintenance frame carry out relative moving, be maintained at the stitching that forms stitch data (trace pattern) according to the rules on the cloth that keeps on the frame relative to eedle.

Here, eedle 108 described later is carried out moving up and down direction be defined as Z-direction (above-below direction), a direction with its quadrature is defined as X-direction (left and right directions), the direction with Z-direction and X-direction both sides quadrature is defined as Y direction (fore-and-aft direction).

As shown in Figure 1, electronic cycle sewing machine 100 (hereinafter referred to as Sewing machines 100) is made of top sewing machine main body 101 that is arranged on sewing machine table T and the pedal R etc. that is used to operate sewing machine main body 101 that is arranged on sewing machine table T bottom.

(sewing machine frame and main shaft)

As shown in Figure 1, sewing machine main body 101 has sewing machine frame 102, and the profile of this sewing machine frame is observed from side-looking face and is roughly コ font.This sewing machine frame 102 have the top that constitutes sewing machine main body 101 in front and back the upwardly extending head of sewing machine 102a of portion, constitute the upwardly extending Sewing machines base plate 102b in front and back and the vertical body 102c of portion that is connected 102a of head of sewing machine portion and Sewing machines base plate 102b of the bottom of sewing machine main body 101.

This sewing machine main body 101 disposes Poewr transmission mechanism in sewing machine frame 102, and has the rotation main shaft 2 in the fore-and-aft direction extension (with reference to figure) 4 freely) and not shown lower shaft.Main shaft 2 is set at the inside of the 102a of sewing machine frame portion, and lower shaft (omitting diagram) is set at the inside of Sewing machines base plate 102b.

Main shaft 2 is connected with Spindle Motor 2a (with reference to Figure 14) as motor of sewing machine of the present invention, and 2a gives rotatory force by this Spindle Motor.In addition, lower shaft (omitting diagram) links by the not shown longitudinal axis and main shaft 2, and when main shaft 2 rotated, the power of main shaft 2 was delivered to the lower shaft side by the longitudinal axis (omitting diagram), and lower shaft is rotated.

The front end of main shaft 2 is connected with shank 108a, and this shank 108a moves up and down on Z-direction based on the rotation of main shaft 2, in the lower end of this shank 102a, as shown in Figure 2, has the eedle 108 that can arbitrarily change.The eedle 108 of different length can be installed on shank 108a like this.Here, under the different situation of the length of eedle 108, the lower dead point position of shank 108a that short eedle 108 has been installed is lower than the lower dead point position of the shank 108a that long eedle 108 has been installed, thereby can connect cloth effectively.That is, in a plurality of eedles 108 of different length, the lower dead point position of shank 108a that the shortest eedle 108 has been installed is minimum.

In addition, on the driving output shaft of Spindle Motor 2a or main shaft 2, be provided with encoder 2b (with reference to Figure 14).This encoder 2b is used to detect the main axis rotation angle of Spindle Motor 2a, and for example, every rotation 1 degree of the main shaft of Spindle Motor 2a is to control device (control module) 1000 output pulse signals.In addition, along with 1 rotation of main shaft 2, shank 108a carries out a reciprocating motion.

In addition, the front end at lower shaft (omitting diagram) is provided with rotating shuttle (omitting diagram).When lower shaft and main shaft 2 together rotated, the interoperation by eedle 108 and rotating shuttle (omitting diagram) formed stitching.

In addition, about the syndeton of Spindle Motor 2a, main shaft 2, shank 108a, eedle 108, lower shaft (omitting diagram), rotating shuttle (omitting diagram) etc., because with known structure was identical in the past, so be not described in detail at this.

(middle foot device)

As shown in Figure 3, foot device 1 in the inside of the 102a of head of sewing machine portion is provided with, it is used for removing the adhesion that the cloth of thing is made in conduct by pushing, and as depicted in figs. 1 and 2, is provided with needle plate 110 on Sewing machines base plate 102b.Here, in middle foot device 1, for floating of the cloth that prevents to cause because of moving up and down of eedle 108, presser feet 29 in being provided with, should move up and down linkedly with moving up and down of shank 108a by middle presser feet 29, the cloth around the eedle 108 is pushed to the needle plate direction.

In addition, above needle plate 110, dispose maintenance frame 111 described later and eedle 108.This eedle 108 is configured to connect formed through hole on the front end of middle presser feet 29.

Keep frame 111 to be installed on the installing component 113 on the leading section that is disposed at the 102a of head of sewing machine portion, this installing component 113 links (with reference to Figure 14) with X-axis motor 76a and the Y-axis CD-ROM drive motor 77a as the driver element that are configured in the Sewing machines base plate 102b.And, keep frame 111 when keeping cloth, to move along with the driving of X-axis motor 76a and Y-axis motor 77a, thus with the direction (horizontal direction) of the direction quadrature that moves up and down of eedle 108 on carry out the conveying of cloth.By making the action interlock with eedle 108 and rotating shuttle (omitting diagram) of moving that keeps frame 111, on cloth, form stitching based on the stitching data of making graph data of regulation.

In addition, keep frame 111 to be made of cloth presser feet (omitting diagram) and lower plate (omitting diagram), installing component 113 can drive up and down under the driving of the cloth presser feet motor 79b in being configured in the 102a of head of sewing machine portion, when the cloth presser feet descends, and lower plate between with cloth holder and keep.

Pedal R is used to drive Sewing machines 100, the operating pedal that shank 108a (eedle 108) is moved up and down and maintenance frame 111 is moved.Promptly, on pedal R, be assembled with the operating position that depresses that is used to detect when depressing pedal R, the sensor that constitutes by variable resistor etc. for example, this signal of sensor is outputed to control device 1000 described later as the operation signal of pedal R, control device 1000 is according to this operating position, operation signal, drive Sewing machines 100, make its action.

As Fig. 3～shown in Figure 5, middle foot device 1 is set on the main shaft 2, and the shank 108a that this main shaft 2 is provided with eedle 108 to front end direction up and down drives.Be fixed with eccentric cam 3 on main shaft 2, this eccentric cam 3 links with the connecting rod 4 that continues.Be connected with swing shaft clip 5 on the connecting rod 4 that continues, swing shaft clip 5 is connected with an end of swinging axle 6.

As Fig. 3～shown in Figure 5, in the other end of swinging axle 6, the base end part of presser feet regulating arm 7 in being fixed with, presser feet regulating arm 7 is used for regulating the amount of movement of presser feet 29 on above-below direction D1 in this.On middle presser feet regulating arm 7, be formed with cam path 7a.This cam path 7a forms circular-arc slotted hole, and an end of the desirable position of this cam path 7a and the 1st connecting rod 8 for example adjusting nut 9 and segmentation screw 10 is rotated fixing freely.This fixed position till the scope of the position that intersects from axial line distolateral assigned position of presser feet regulating arm 7 to more close than this crossover location with swinging axle 6, can in this scope, carry out desirable adjusting.

The stage casing part of the other end of the 1st connecting rod 8 and the 2nd connecting rod 11 constitutes the binding of rotating freely by segmentation screw 12.In addition, the cam path 7a of chimeric adjusting nut 9, when middle presser feet 29 was positioned at the bottom dead centre that pumps, the axle center that becomes with segmentation screw 12 was the part of the circular arc at center.Rear side binding at the 2nd connecting rod 11 has positioning linkage rod 13.

Positioning linkage rod 13 utilizes segmentation screw 14 to be rotated on the sewing machine frame 102 that is installed in freely as the Sewing machines basket position consistency of the segmentation screw 12 the when position of segmentation screw 14 and middle presser feet 29 are positioned at bottom dead centre in the central near the portion.

On an end of positioning linkage rod 13, be formed with spring carrier arm 13a, in addition, on sewing machine frame 102, be fixed with spring carrier arm 15a, between these two spring carrier arms, hang helical spring 16, an end of positioning linkage rod 13 that spring carrier arm 13a has been installed is applied stretch the spring force that draws downwards.That is, helical spring 16 plays a role as force application part, when the connecting portion P1 with the 3rd connecting rod 20 of its 2nd connecting rod 11 of presser feet swing part in conduct is moved upward, connecting portion P1 is applied spring force towards the below.The other end of positioning linkage rod 13 links with stoping parts 17, and an end of the 2nd connecting rod 11 and the other end of positioning linkage rod 13 utilize a segmentation screw 18 to link.In addition, stoping parts 17 together to be rotated by segmentation screw 14 and positioning linkage rod 13 is installed on the sewing machine frame 102 freely.Above an end 17a who stops parts 17, be provided with the limiting part 19 that restriction stops parts 17 to rotate upward.In addition, this limiting part 19 also can be replaced by the part of sewing machine frame 102.And, constitute middle presser feet swing mechanism M1 by the 1st connecting rod the 8, the 2nd connecting rod 11, positioning linkage rod 13.

Binding is freely rotated with an end of segmentation screw 21 and the 3rd connecting rod 20 in the other end of the 2nd connecting rod 11.Binding is freely rotated by an end of segmentation screw 23 and the 4th connecting rod 22 in the other end of the 3rd connecting rod 20, and constitutes the state of arranging in upright arrangement on the length direction of the 3rd connecting rod 20.Constitute middle presser feet linkage component 24 by the 3rd connecting rod 20 and the 4th connecting rod 22.

The other end of the 4th connecting rod 22 links by segmentation screw 26 and connecting rod relay plate 25.Presser feet pole band 27 in being fixed with on connecting rod relay plate 25 is by the middle presser feet pole band 27 middle presser bar 28 that the below extends that keeps up.On the bottom of middle presser bar 28, be equipped with when making the middle presser feet 29 of cloth presser on needle plate.On the upper end of middle presser bar 28, be provided with helical spring 30, and use screw 31 and nut 32 that it is installed on the middle presser feet pole band 27.

Segmentation screw 23 is with square washer 33 and guide member 34 and the 3rd connecting rod 20 and 22 bindings of the 4th connecting rod.That is, be provided with guide member 34, be provided with square washer 33,, use a segmentation screw 23 to link the 3rd connecting rod the 20, the 4th connecting rod 22, square washer 33 and guide member 34 in the face side of this guide member 34 in the face side of the 4th connecting rod 22.

Square washer 33 be fill and the linking part P3 of segmentation screw the 23, the 3rd connecting rod 20 and the 4th connecting rod 22 between the clearance gap thing, its effect is the collision that prevents each connecting rod, so that drive each parts swimmingly.

Guide member 34 is the sheet material of general triangular shape, and its upper end 34t is rotated by segmentation screw 35 and is installed in freely on the sewing machine frame 102.Near the bottom of guide member 34, be formed with the slotted hole 34a of direction prolongation up and down.This slotted hole 34a forms the diameter that its width is slightly larger than the threaded portion of segmentation screw 23, at this slotted hole 34a interpolation reduction of fractions to a common denominator section screw 23.That is, guide member 34 can move the linking part P3 of the 3rd connecting rod 20 and the 4th connecting rod 22 on the above-below direction D1 of middle presser feet 29, and limits the 3rd connecting rod 20 and the 4th connecting rod 22 moving to the direction D3 of crosscut direction D2 in upright arrangement.

In addition, guide member 34 near the top of slotted hole 34a, rotates binding freely by a segmentation screw 37 and an end of mobile link 36, this mobile link 36 makes this guide member 34 move to the direction of the direction in upright arrangement of crosscut the 3rd connecting rod 20 and the 4th connecting rod 22 as travel mechanism.The other end of mobile link 36 and eccentric cam 38 link, this eccentric cam 38 links with the end that the regulating shaft 39 of parts is regulated in conduct, the height apart from needle plate 110 (middle presser feet height) when presser feet 29 arrived bottom dead centres during this regulating shaft 39 was regulated by pivoting.The other end of regulating shaft 39 links by bearing 40, bevel gear 41 and middle presser feet motor 42 as CD-ROM drive motor.Promptly, because the driving of middle presser feet motor 42 is transmitted according to the order of regulating shaft 39, eccentric cam 38, mobile link 36, by mobile link 36 guide member 34 is moved, so, by presser feet motor 42 in this and guide member 34 and between them each component parts of transferring power, with middle presser feet motor 42 is drive source, and the height of centering presser feet 29 is adjusted.

Bevel gear 41 and bevel gear 43 engagements, its can with the driving of middle presser feet motor 42 to the direction D5 output of the direction of principal axis quadrature of regulating shaft 39.There are bearing 44 and middle presser feet lifter cam 45 etc. in the rear end of bevel gear 43, coaxial binding.

As Fig. 6～shown in Figure 8, middle presser feet lifter cam 45, it is that the side on boundary is formed roughly the same circular-arc (hereinafter referred to as keeping the 45a of portion) of distance from the center of rotation to the outer peripheral face with the center line by center of rotation, opposite side is formed its distance from the center of rotation to the outer peripheral face greater than the distance of keeping among the 45a of portion from the center of rotation to the outer peripheral face, and the shape that changes sleekly (below become change section 45b).

Middle presser feet lifter cam 45 is used to pressure foot lifting parts 46 in the lifting, should in pressure foot lifting parts 46 be used to make in presser feet 29 rise to and keep out of the way height and position P5 after the sewing finishing, the outer peripheral face of the cylindric roller 47 of an end of pressure foot lifting parts 46 contacts with the outer peripheral face of middle presser feet lifter cam 45 in being located at.Promptly, when the 45a of the portion that keeps of middle presser feet lifter cam 45 contacts with roller 47, middle pressure foot lifting parts 46 do not rise (with reference to Fig. 6), when the change section 45b of middle presser feet lifter cam 45 contacts with roller 47, and middle pressure foot lifting parts 46 risings (with reference to Fig. 7 and Fig. 8).That is, constitute middle presser feet and keep out of the way the M2 of mechanism by middle presser feet lifter cam 45, middle pressure foot lifting parts 46 and roller 47.

Middle pressure foot lifting parts 46, belly rotates by pin 48 and is installed in freely on the sewing machine frame 102 therein.Middle pressure foot lifting parts 46 are configured to the below that its other end is arranged in presser feet pole band 27, during contacting with roller 47 and make, change section 45b by middle presser feet lifter cam 45 rises on the other end of pressure foot lifting parts 46, presser feet pole band 27 rises in can making, and presser feet 29 rises to and keeps out of the way height and position P5 (with reference to Fig. 8) in making.In addition, on sewing machine frame 102, the top position above middle pressure foot lifting parts 46 is provided with spring carrier arm 49, tangles an end of helical spring 50 on this spring carrier arm 49, and its other end is hung near the end of middle pressure foot lifting parts 46.Thus, an end of centering pressure foot lifting parts 46 always applies the power towards the top.

Below, in conjunction with Fig. 3 to Fig. 8, the action of middle foot device 1 with said structure is described.

As driving main shaft motor 2a, when main shaft 2 and eccentric cam 3 are rotated, continue connecting rod 4 front end with the axis of main shaft 2 roughly the direction of quadrature (the direction D3 of the direction D2 in upright arrangement of crosscut the 3rd connecting rod 20 and the 4th connecting rod 22) go up swing, the swing shaft clip 5 that links with the connecting rod 4 that continues is also to equidirectional swing.Because the swing of swing shaft clip 5 also makes swinging axle 6 swings, so an end of the 1st connecting rod 8 becomes the swing fulcrum, roughly is swinging on the direction of quadrature (the direction D3 of the direction D2 in upright arrangement of crosscut the 3rd connecting rod 20 and the 4th connecting rod 22) with the axis of swinging axle 6 the other end of the 1st connecting rod 8.Swing along with the other end of the 1st connecting rod 8, swing on the direction D2 in upright arrangement of the 3rd connecting rod 20 and the 4th connecting rod 22 the other end of the 2nd connecting rod 11, and the 3rd connecting rod 20 that links with the other end of the 2nd connecting rod 11 and the 4th connecting rod 22 are in the last swing of this array direction (above-below direction) D2.Because along with the swing of the 3rd connecting rod 20 and the 4th connecting rod 22, the middle presser bar 28 that links with the 4th connecting rod 22 moves downwards along above-below direction D1, institute is so that middle presser feet 29 is also mobile downwards.That is, carry out axial rotation by main shaft 2, middle presser feet 29 moves up and down along the direction that moves up and down of eedle 108.

Below, in conjunction with Fig. 3 to Fig. 9, the adjusting action of the middle presser feet height and position P4 of middle foot device 1 with said structure is described.

The CPU73 of control device 1000 described later, by executive control program, presser feet motor 42 is made graph data and middle presser feet altitude information according to being stored among the EEPROM72 described later in making, and begins to drive.

The driving of middle presser feet motor 42 is passed to regulating shaft 39 by bevel gear 41 and bearing 40, makes regulating shaft 39 begin to rotate.The rotation of regulating shaft 39 is also rotated eccentric cam 38, thus make mobile link 36 to the roughly direction of quadrature (the direction D3 of the direction D2 in upright arrangement of crosscut the 3rd connecting rod 29 and the 4th connecting rod 22) swing of the axis of regulating shaft 39.The swing of mobile link 36 is swung guide member 34 on the direction D3 of the direction D2 in upright arrangement of crosscut the 3rd connecting rod 20 and the 4th connecting rod 22.

At this moment, as shown in Figure 9, the segmentation screw 23 of the 3rd connecting rod 20 that links at the slotted hole 34a of guide member 34 and the linking part P3 of the 4th connecting rod 22, because its threaded portion is to the mobile restriction that is subjected to slotted hole 34a of the direction D3 of the direction D2 in upright arrangement of crosscut the 3rd connecting rod 20 and the 4th connecting rod 22, so the power of transmitting based on swing can not be released to other positions, and segmentation screw 23 is moved upward along slotted hole 34a, thus, follow moving of guide member 34 along with segmentation screw 23, the angle θ that forms between the 3rd connecting rod 20 that links and the 4th connecting rod 22 that arranges in upright arrangement is changed, and presser feet linkage component 24 forms roughly ㄑ font in making.In the middle of presser feet linkage component 24 when becoming roughly the ㄑ font, distance L between the both ends of middle presser feet linkage component 24, in other words, the distance L between an end of the 3rd connecting rod 20 and the other end of the 4th connecting rod 22 shortens, and presser feet 29 is moved upward along above-below direction D1 in making.Thus, can regulate in presser feet 29 apart from the middle presser feet height and position P4 of needle plate.

(the control system of Sewing machines: whole summary)

In addition, as Fig. 1, shown in Figure 10, Sewing machines 100 (sewing machine main body 101) has guidance panel (operating unit) 74a, and it is used to make the operator Sewing machines to be carried out the input operation of various setting operations and various data etc.This guidance panel 74a utilizes not shown wired or wireless circuit to be connected with sewing machine main body 101.

Guidance panel 74a have the input that can carry out the various settings of Sewing machines, various data operation a plurality of operated key groups and show data display part 74b of various set conditions etc. etc.

As shown in figure 10, in guidance panel 74a, be provided with data display part 74b, prepare key 74e, reset key 74f ,+/ the key 74g that advances,-/back spacer 74h, figure numbered keys 74i, X amplify LED90 that minification key 74j, Y amplify the operating state etc. of minification key 74k, speed key 74l, middle presser feet height key 74m, program key (" Pr1 ", " Pr2 ", " Pr3 ", " Pr4 ") 74o and expression Sewing machines and various keys, 91 etc.

In data display part 74d,, show various data numbers corresponding and value data etc. with key at the position that LED91 lights.

Prepare key 74e and be to be used to determine to utilize+/ advance key 74g with-/key of data that back spacer 74h etc. is changed or the operation of numerical value etc.

Reset key 74f be used to carry out utilize+/ advance key 74g and-/key of operation that data that back spacer 74h etc. is changed or numerical value reset etc.

+/advance key 74g and-/back spacer 74h be the change that is used to carry out various data numbers and value data (forward :+, backward:-) the key of operation etc.

Figure numbered keys 74i is used for, for example carrying out according to stored predefined when making the making of graph data, in order to select the desirable graph data of making, access with this make graph data corresponding make graph data, and show that this makes the key of figure No..In addition, will be explained below for making graph data.

X amplifies minification key 74j, Y, and to amplify minification key 74k be setting input of respectively the X-axis component and the Y-axis component of its figure being amplified minification when being used to make figure and the key that shows.

Speed key 74l is the setting input of the spindle speed when being used to make and the key that shows.

In presser feet height key 74m be the setting input of height of middle presser feet 29 of the foot device 1 when being used for making and the key that shows.

Program key (" Pr1 ", " Pr2 ", " Pr3 ", " Pr4 ") 74o is the key that is used to select data (programme diagram graphic data), these data be made up make graph data, amplify minification, spindle speed, middle presser feet height etc. be used to carry out the data that customizations is made.

In addition, be input to various data such as stitch data among the guidance panel 74a, programme diagram graphic data, be output in the control device 1000 described later, and be stored among the EEPROM72 described later by various key assignmentses.

(control system of Sewing machines: make figure)

Here, opposite joint drawing shape describes.

Make figure and be the figure of handling the needle when making, this figure of handling the needle is by making pictorial data representaton, this makes graph data, is that the data stitching data of eedle position (expression fall) of directions X amount of movement, Y direction amount of movement in the time of will keeping frame 111 to move in order to carry out this to handle the needle figure are combined into and a plurality ofly constitute.Figure 11, Figure 12 represent actual to make graph data and an example of the figure of handling the needle.If handle the needle according to the graph data of making of figure No.1 shown in Figure 11 from origin position (0,0), then carry out shown in Figure 12 handling the needle, form stitching.

In addition, shown in Figure 11 making in the graph data, sky send 1, sky send 2, sky send 3 ... making 16, make 17, is to make the directions X amount of movement when keeping frame 111 to move, the data (parameter) of Y direction amount of movement.That is, decide an X-axis motor 76aY when making and the rotation drive amount of axle motor 77a by these data.

And when " sky send ", shank 108a (eedle 108) is failure to actuate, and only keeps frame 111 to move, and when " making ", shank 108a (eedle 108) together moves with keeping frame 111, thereby forms stitching.

In addition, " trimming " is that " end " is the instruction at the action of Sewing machines 100 at the instruction of cutting facility (omitting diagram), because its action is not needed to set numerical value, so the numeric data of setting (in Figure 11, carrying out mark) with (0).

In addition, " middle presser feet height " is the instruction at the action of middle foot device 1, and comprises the numeric data to this action.

That is, decide at height by the middle presser feet 29 on the phase place (180 degree) of the bottom dead centre of the eedle 108 of the anglec of rotation defined of Spindle Motor 2a according to the setting value of " middle presser feet height ", that is, and the rotary angle position of middle presser feet motor 42.

In addition, the numerical value in the numeric data of Figure 11,12 X amount of movement, Y amount of movement, middle presser feet amount of movement is expressed as 10 times of souvenirs, for example " 15 " expression " 1.5mm ".

(sewing-machine control systems: the program figure)

Below, the program figure is described.

As shown in figure 13, in the programme diagram graphic data, that has selected to make makes graph data arbitrarily, to increase and decrease this make in the figure each " sky send ", " make " the X amount of movement of instruction, the X of Y amount of movement amplifies minification and Y amplification minification has been carried out setting value, the rotary speed of Spindle Motor 2a when making, it is spindle speed, with the bottom dead centre height of the middle presser feet 29 that becomes the benchmark in making (wherein, in in making figure, setting under the situation of presser feet height, it is preferential to make figure) carry out setting value, and (wherein to the correction of the amplitude that moves up and down of the middle presser feet 29 that becomes the benchmark in making, under the situation of the correction of presser feet amplitude, it is preferential to make figure in setting in making figure) carry out setting value.

And, when the performing a programme graph data,, adjust X amount of movement, Y amount of movement for the figure of making that is recorded in the selected program figure, make according to the spindle speed that sets, middle presser feet height and amplitude adjustment amount.

In addition, in control device 1000 described later, in EEPROM72, can preserve four programme diagram graphic data, and, can access respectively by operating program key (" Pr1 ", " Pr2 ", " Pr3 ", " the Pr4 ") 74o of aforesaid operations panel 74a.

(the control system of Sewing machines: control device)

As shown in figure 14, Sewing machines 100 has the control device 1000 of the action that is used to control above-mentioned various piece, each parts.

Control device 1000 as shown in figure 14, has ROM70, RAM71, EEPROM72 and CPU73.

In ROM70 (PROM), storing memory has the control program and the control data of Sewing machines 100 (sewing machine main body 101), and about various data of making.

In RAM71, be provided with various working storage sum counters etc., it is used as makes in the action and use the working region of data in handling, and is used for the temporary transient program of reading from ROM70 or EEPROM72 or the data etc. of preserving.

EEPROM72 is used to preserve various data and the various parameter of being imported.

Particularly, EEPROM72 stores as storage part of the present invention that the combination by a plurality of stitching data by guidance panel 74a input constitutes makes graph data (for example, the figure No.1 of Figure 11 make graph data etc.) and program figure.

In addition, EEPROM72 stores X and amplifies the data, spindle speed data, middle presser feet altitude information etc. that minification and Y amplify minification.

In addition, EEPROM72 stores the programme diagram graphic data (for example, programme diagram graphic data " Pr1 ", " Pr2 ", " Pr3 ", " Pr4 " of Figure 13) of the stitch data that is formed by combining as data, spindle speed data, the middle presser feet altitude information of being made graph data, X amplification minification Y amplification minification by these etc.

And the lower dead point position of the shank 108a when the EEPROM72 handle has been installed the shortest eedle 108 on shank 108a is preserved as limits value.This limits value is that the bottom dead centre height of presser feet 29 is not higher than the lower end position of the shank 108a that is positioned at extreme lower position and the value set in making.

CPU73 as operating area (working region), carries out RAM71 based on the exercises processing that is stored in the control program among the ROM70, calculation process etc.

In addition, CPU73 is connected with guidance panel 74a by interface 74, according to the data from guidance panel 74a input, the selection and the change of making graph data.Here, when the input of the bottom dead centre height of middle presser feet 29, when having imported than the high value of limits value to guidance panel 74a, CPU73 controls LED91, makes it show limits value at data display part 74d, and limits value is set at input value.

In addition, CPU73 is connected with starting switch 74c with cloth presser feet switch 74b by interface 74, import under the situation of index signal from cloth presser feet switch 74b and starting switch 74c, handling, the various piece of Sewing machines 100 is made according to the above-mentioned graph data etc. of making.

In addition, CPU73 is connected with the Spindle Motor drive circuit 75b of driving main shaft motor 2a by interface 75, by controlling the rotation of Spindle Motor 2a, controls the action of driving mechanism (the shank 108a, main shaft 2 etc. of eedle 108 for example, have been installed).In addition, Spindle Motor 2a has encoder 2b, in the Spindle Motor drive circuit 75b of driving main shaft motor 2a, the Z phase signals of exporting from each rotation of the corresponding Spindle Motor 2a of encoder 2b, be imported into CPU73 by interface 75, according to this signal, CPU73 can identify the initial point (0 degree position) in the rotation of main shaft 2.In addition, per 1 degree from the anglec of rotation of the corresponding Spindle Motor 2a of encoder 2b and the A phase signals of output is imported into CPU73 by interface 75, CPU73 is by being benchmark with above-mentioned Z phase signals, umber of pulse to the A phase signals is counted, and can identify the current anglec of rotation of main shaft 2.

In addition, for Spindle Motor 2a, for example can use servo motor.

In addition, CPU73 is by interface 76 and interface 77, be connected with Y-axis motor drive circuit 77b with X-axis motor drive circuit 76b, this drive circuit 76b and 77b are used for driving respectively set X-axis motor 76a and Y-axis motor 77a on the maintenance frame 111 of the cloth that keeps making; Control thus and keep the action of frame 111 on X-direction and Y direction.

In addition, CPU73 is connected with the middle presser feet motor drive circuit 78b of presser feet motor 42 in the driving by interface 78, should be used for being independent of the height and position of regulating presser feet 29 based on moving up and down of Spindle Motor 2a by middle presser feet motor 42, the action of foot device 1 in the control thus.

In addition, CPU73 is used to make the cloth presser feet motor drive circuit 79b of the cloth presser feet motor 79a that cloth presser feet (omitting diagram) moves up and down to be connected by interface 79 and driving, and controls the action of cloth presser feet.

In addition, X-axis motor 76a and Y-axis motor 77a, middle presser feet motor 42, cloth presser feet motor 79a for example can use impulse motor.

In addition, CPU73 is connected with Y-axis origin sensor 80b with the X-axis origin sensor 80a that is used to detect the origin position that keeps frame 111 by interface 80, and whether input expression maintenance frame 111 turns back to the signal of origin position, controls according to this signal.

In addition, CPU73 is connected by the middle presser feet origin sensor 80c of interface 80 with the origin position of the middle presser feet 29 that is used for detecting foot device 1, whether the middle presser feet 29 of foot device 1 is configured in correct locational signal in the input expression, carries out the control according to this signal.

In addition, CPU73 is connected by the cloth presser feet origin sensor 80d of interface 80 with the origin position that is used to detect cloth presser feet (omitting diagram), and input represents that whether the cloth presser feet turns back to the signal of origin position, carries out the control based on this signal.

The molar behavior explanation of Sewing machines (flush joint thread)

Below, in conjunction with flow chart shown in Figure 15, the action of Sewing machines 100 of the present invention is described.

At first, connect the main power source (omitting diagram) of Sewing machines 100, under the state that has started Sewing machines 100, when control device 1000 detects the signal that program key (" Pr1 ", " Pr2 ", " Pr3 ", " Pr4 ") 74o is pressed, (step S101: be), in the programme diagram graphic data of control device 1000 from be stored in EEPROM72, select also to read the regulated procedure graph data corresponding, and in RAM71, launch to set (step S102) with the program key 74o that is pressed.

Then, control device 1000 is at (step S101: not) or after the setting of the program figure in step S102, transfer to step S103 under the situation that does not detect the signal that program key 74o is pressed.

Then, when control device 1000 detects figure No. key 74i, X and amplifies minification key 74j, Y and amplify the signal that minification key 74k, speed key 74l, middle presser feet height key 74m be pressed (step S103: be), control device 1000 judges whether the key that is pressed is middle presser feet height key 74m (step S104).Here middle if the judgment is Yes presser feet height key 74m is pressed (step S104: be), and then control device 1000 is set at the upper limit of the bottom dead centre height input value of middle presser feet 29 less than limits value (step S105).

And, under the situation that presser feet height key 74m is not pressed in control device 1000 is judged as, perhaps after the action of step S105, transfer to step S106.

Then, control device 1000 shows setting content and the setting data corresponding with each key in data display part 74d, and makes corresponding LED91 light (step S106).

And, control device 1000 is (step S103: not) when not detecting figure No. key 74i, X and amplify minification key 74j, Y and amplify the signal that minification key 74k, speed key 74l, middle presser feet height key 74m be pressed, perhaps after the action in step S106, transfer to step S107.

Then, control device 1000 detecting+/ the key 74g that advances,-/during signal that back spacer 74h is pressed (step S107: be), control device 1000 carries out the renewal (step S108) of setting content shown in data display part 74d, setting data.Here, when the setting of the bottom dead centre height of middle presser feet 29, even imported value more than or equal to limits value, also the bottom dead centre height of limits value as input, logarithm shown setting content, the setting data of the 74d of portion according to the show upgrades control device 1000.

And control device 1000 do not detecting+/ the key 74g that advances,-/(step S107: not), after perhaps the setting in step S108 is upgraded, transfer to step S109 during signal that back spacer 74h is pressed.

Then, control device 1000 monitors whether prepare key 74e is operated, and control device 1000 is not detecting (step S109: not), return step S101 under the situation of preparing the signal that key 74e is pressed.On the other hand, control device 1000 is detecting (step S109: be) when preparing signal that key 74e is pressed, determines the setting that is updated to enter step S110 then at step S108.

Then, whether the data of the height (bottom dead centre height) of presser feet were by change (step S110) during control device 1000 was judged.When the data of control device 1000 presser feet height in being judged as are changed (step S110: be), control device 1000 writes (step S111) in the graph data to the data of the new middle presser feet height that is changed.On the other hand, (step S110: not), perhaps after the writing of the data in step S111, transfer to step S112 under the data conditions of control device 1000 presser feet height in being judged as not change.

Then, control device 1000 amplifies minification at the program figure No, the X that are judged as selected setting in step S102, Y amplifies minification, Sewing machines speed, (step S112: be) when middle presser feet height is changed, the data of the new program figure that is changed are write (step S113) among the EEPROM72, enter step S114 then.On the other hand, control device 1000 (step S112: not), enter step S114 when the program of being judged as is not changed.

Next, control device 1000 drives cloth presser feet motor 79a, makes cloth presser feet (omitting diagram) move to the former point retrieval (step S114) of the detection position of cloth presser feet origin sensor 80d.In addition, the origin position of cloth presser feet is a cloth presser feet down position.

And, presser feet motor 42 during control device 1000 drives, the former point retrieval (step S115) of the detection position of presser feet origin sensor 80c during presser feet moves in making.In addition, the origin position of middle presser feet is middle presser feet lifting position.

And, control device 1000 drives X-axis motor 76a and Y-axis motor 77a, make to keep frame 111 to move to the former point retrieval of the detection position of X-axis origin sensor 80a, Y-axis origin sensor 80b, make then keep frame 111 move to selected make graph data make starting position (step S116).

Then, control device 1000 drives cloth presser feet 79a, makes cloth presser feet (omitting diagram) rising (step S117).

Then, control device 1000 is judged cloth presser feet SW74b whether be pressed (S118).

Control device 1000 is (step S118: not), return step S118 under the situation that does not detect the signal that cloth presser feet SW74b is pressed.On the other hand, control device 1000 is detecting under the situation that cloth presser feet SW74b is pressed (step S118: be), drives cloth presser feet motor 79a, makes cloth presser feet (omitting diagram) descend (step S119).

In addition, control device 1000 is judged cloth presser feet SW74b whether be pressed (step S120).

Control device 1000 drives cloth presser feet motor 79a under the situation that detects the signal that cloth presser feet SW74b is pressed (step S120: be), cloth presser feet (omitting diagram) is risen (step S121), returns step S118.On the other hand, control device 1000 (step S120: not), enter step S122 under the situation that does not detect the signal that cloth presser feet SW74b is pressed.

Then, control device 1000 is judged and is started SW74c whether be pressed (step S122).

Control device 1000 is not detecting (step S122: not), return step S120 under the situation that starts the signal that SW74c is pressed.On the other hand, control device 1000 is made action and is handled (step S123) detecting under the situation that starts the signal that SW74c is pressed (step S122: be), enters step S124 after this processing finishes.

Then, control device 1000 drives X-axis motor 76a, Y-axis motor 77a, maintenance frame 111 is moved to from the sewing finishing position make starting position (step S124).

And control device 1000 drives cloth presser feet motor 79a, and cloth presser feet (omitting diagram) is risen (step S125), returns step S118 then, and the repeated seam braking is done.

As mentioned above, Sewing machines 100 according to the 1st embodiment, after having imported the bottom dead centre height to guidance panel 74a, if the value of the bottom dead centre height of this input has surpassed limits value, then control device 1000 automatically is replaced as the value of the bottom dead centre height of being imported with this limits value, and it is saved among the EEPROM72 as the bottom dead centre height, so, can prevent in making in the bottom dead centre height of presser feet 29 surpass limits value.The shortest eedle 108 that above-mentioned limits value, correspondence can be installed in a plurality of eedles 108 on the Sewing machines 100 is set.Thus, in making, because middle presser feet 29 is positioned at the position lower than the lower end of shank 108a, so middle presser feet 29 can not interfere with shank 108a, thus the damage of presser feet 29 or shank 108a in can preventing.

[the 2nd embodiment]

Below, the 2nd embodiment of the present invention is described.Here, in the above-described first embodiment, to when having imported the bottom dead centre height of middle presser feet 29, being that the situation that is not more than limits value is illustrated with the bottom dead centre limitation in height of middle presser feet 29, but in the 2nd embodiment, be the bottom dead centre height of presser feet 29 in making action process limited system.Therefore, in the 2nd embodiment, omitted step S104, the step S105 of the flow chart of Figure 15 and about the explanation of this part.In addition, in the following description,, and omit explanation for the identical symbol of part mark identical with the 1st embodiment.

Below, illustrate that in conjunction with flow chart shown in Figure 16 the action of making among the step S121 of flow chart of Figure 15 is handled.

Sewing machines 100 is according to making graph data and make in the selected a plurality of stitching data of making in the graph data of step S102 in the programme diagram graphic data of selecting at step S101.

At first, control device 1000 judges whether selected stitching data of making graph data are " sky send " data (step S201).

Control device 1000 is when being judged as the stitching data for " sky send " data (step S201: be), then control device 1000 drives X-axis motor 76a, Y-axis motor 77a according to X amount of movement, the Y amount of movement of " sky send " data, makes to keep frame 111 to move (step S202).

And control device 1000 is being judged as stitching data (step S201: not), perhaps after the action of step S202, enter step S203 when not being " sky send " data.

Then, control device 1000 judges whether selected stitching data of making graph data are " end data (END instruction) " (step S203).

When control device 1000 is judged as the stitching data and is " end data (END instruction) " (step S203: be), then finish to make action and handle (subprogram), return main program.On the other hand, (step S203: not), then enter step S204 when control device 1000 is judged as the stitching data and is not " end data (END instruction) ".

Then, control device 1000 judges whether the middle presser feet altitude information of making graph data surpasses limits value (step S204).Surpass under the situation of limits value (step S204: be) at middle presser feet altitude information, control device 1000 is transferred to step S205, presser feet altitude information during limits value is changed to.

At middle presser feet altitude information is not surpass (step S204: deny) under the situation of limits value, or after the action of step S205, control device 1000 is transferred to step S206.

Then, control device 1000 is according to the middle presser feet altitude information of making in the graph data, and presser feet motor 42 actions in making descend middle presser feet 29 and are configured to the height (step S206) of regulation, enter step S207 then.

Next, control device 1000 is according to the Sewing machines speed of setting, to Spindle Motor drive circuit 75b output Sewing machines speed command, starting Sewing machines rotate instruction, make main shaft 2 rotations of Sewing machines 100, and make shank 108a (eedle 108) action (step S207).

Then, control device 1000 judges whether the input (step S208) of signal under the pin.(step S208: not), return step S208, (step S208: be) enters step S209 to control device 1000 under the situation that signal under the pin is arranged under the situation that does not have signal input under the pin.

Then, control device 1000 judges whether selected stitching data of making graph data are " trimming data (trimming instruction) " (step S209).

Control device 1000 enters step S216 being judged as the stitching data when being " trimming data (trimming instruction) " (step S209: be).

On the other hand, control device 10000 is being judged as stitching data (step S209: not), enter step S210 when not being " trimming data (trimming instruction) ".

Then, control device 1000 judges whether selected stitching data of making graph data are " making " data and whether are XY driving time (step S210).(step S210: not), return step S210, be under the situation of XY driving time (step S210: be) being judged as to control device 1000, enters step S211 being judged as under the situation that is not the XY driving time.

Control device 1000 drives X-axis motor 76a, Y-axis motor 77a according to X amount of movement, the Y amount of movement of " making " data, make to keep frame 111 to move, by with the interoperation of eedle 108 (shank 108a), form stitching (step S211).

Then, control device 1000 judges whether next data are middle presser feet data (step S212).Control device 1000 is not that (step S212: not), transferring to step S208, is (step S212: be) under the middle presser feet data conditions being judged as next data, enters step S213 under the middle presser feet data conditions being judged as next data.

Then, control device 1000 judges whether the middle presser feet altitude information of next data surpasses limits value (step S213).Surpass under the situation of limits value (step S213: be) at middle presser feet altitude information, control device 1000 enters step S214, presser feet altitude information during limits value is changed to.

Surpass under the situation of limits value (step S213: not) or after the action of step S214, control device 1000 enters step S215 at middle presser feet altitude information.

Then, control device 1000 makes middle presser feet motor 42 actions according to the middle presser feet altitude information of making in the graph data, and presser feet 29 declines are configured to the height (step S215) of regulation in making, and return step S208 then.

In step S216, control device 1000 carries out trimming, and cuts out the Sewing machines rotate instruction to the instruction of cutting facility (omitting diagram) output trimming, and output Sewing machines halt instruction (step S216) waits for that eedle 108 stops at position on the pin (step S217).

Control device 1000 stops being judged as main shaft 2, and when Sewing machines 100 stops (step S217: be), presser feet motor 42 actions during control device 1000 makes, presser feet 29 rises to the height of regulation in making, it is configured in position of readiness (step S218), returns step S201 then.

As mentioned above, according to the 2nd embodiment Sewing machines 100, because under the situation of bottom dead centre height greater than limits value, control device 1000 is controlled the bottom dead centre height as limits value centering presser feet motor 42, so the bottom dead centre height of presser feet 29 surpasses limits value in can preventing in making.Like this because presser feet 29 is positioned at the position lower than the lower end of shank 108a in making, so middle presser feet 29 can not interfere with shank 108a, thereby the damage of presser feet 29 or shank 108a in can preventing.

In addition, in the 1st and the 2nd embodiment, the situation that limits value is kept among the EEPROM72 in advance is illustrated, but also can be by re-enter the limits value that limits value changes among EEPROM72 to be preserved from guidance panel 74a.Even after shank 108a has been installed, carry out inching, the lower dead point position of shank 108a is lower than under the situation of the limits value of preserving in advance, also can preserve new limits value, conflicting between presser feet 29 and the shank 108a in can preventing according to situation at that time.

In addition, in the above embodiment, to as storage device, middle presser feet height storage device and used the example of EEPROM72 to be illustrated, but the invention is not restricted to this, as storage device, also can have other storage device (magnetic recording media, optical recording media, semiconductor memory etc.).

In addition, driving mechanism is not limited to XY mechanism, also can be driving mechanisms such as single shaft driving or circular arc driving.

In addition, self-evident, about other concrete structure detail etc., the also change that can suit.

Claims

1. the middle foot device of a Sewing machines comprises:

Main shaft with the rotation of motor of sewing machine interlock;

Move up and down, can install the shank of the eedle of different length linkedly with the rotation of main shaft;

Move up and down linkedly with the rotation of main shaft, making the middle presser feet that thing is pushed to needle plate;

By displacement regulate described in the adjusting parts apart from the height of needle plate of presser feet when arriving bottom dead centre;

Make the CD-ROM drive motor of described adjusting parts displacement;

Import the operating unit of the bottom dead centre height of described middle presser feet;

The storage part that described bottom dead centre height in the described operating unit and stitching data are together preserved will be input to; With

According to the described bottom dead centre height and the stitching data that are stored in the described storage part, control the control module of described motor of sewing machine and described CD-ROM drive motor, it is characterized in that:

2. the middle foot device of a Sewing machines comprises:

Main shaft with the rotation of motor of sewing machine interlock;

Make the CD-ROM drive motor of described adjusting parts displacement;

Described control module, to be used for described bottom dead centre limitation in height is the limits value that is not higher than the lower end position of described shank, compare with the described bottom dead centre height that is input in the described operating unit, bottom dead centre height in described input surpasses under the situation of described limits value, replace the described bottom dead centre height of being imported with described limits value, and it is kept in the described storage part.