CN1524989B

CN1524989B - Electronic type sawtooth line track sewing mechine

Info

Publication number: CN1524989B
Application number: CN2004100070528A
Authority: CN
Inventors: 北田贤治; 春日俊明; 柿崎康; 筱塚寿信
Original assignee: Juki Corp
Current assignee: Juki Corp
Priority date: 2003-02-28
Filing date: 2004-02-26
Publication date: 2010-04-14
Anticipated expiration: 2024-02-26
Also published as: KR20040077555A; KR100965352B1; JP2004261273A; CN1524989A; JP4362297B2

Abstract

A needle swing direction judgment means (Step S13) recognizing a change of the direction of swing with a needle swinger from one direction to the other direction, a needle swing correction means (Step S17) controlling the needle swinger so as to form an initial stitch after the needle swing direction is changed by making the needle swing by a corrected needle swing (L+F) in which a prescribed correction (F) is added to the needle swing (L) determined by stitch data when the change of the needle swing direction is recognized by the needle swing direction judgment means. To prevent an initial needle swing from decreasing after the direction of needle swing has changed in a zigzag sewing machine.

Description

Electronic type sawtooth chain stitch sewing machine

Technical field

The present invention relates to more than one down motion eedles, relevant with moving up and down of this eedle and with the work feed spacing of regulation with sewn object to the cloth-feeding device of cloth feeding direction conveying, eedle can be swung in the co-operating of the needle vibrating mechanism of any balancing point position vertical the electronic type sawtooth chain stitch sewing machine of formation stitching on sewn object with the cloth feeding direction of cloth-feeding device.

Background technology

On sawtooth chain stitch sewing machine in the past, at first, when forming the sawtooth stitching, making is with the circular cam of balancing point pattern engraving on excircle, and, this cam utilize the revolving force of Sewing machines master motor to make cam rotation on the Sewing machines by being installed in, according to the balancing point quantitative changeization of the shape needle vibrating mechanism of cam, form the sawtooth stitching.

In addition, in recent years, in to control with such cam face formation balancing point amount, owing to lack many kinds limited-production adaptability and need the manufacturing cost of cam, so, according to the stitching data of decision balancing point amount, drive the sawtooth chain stitch sewing machine of controlling the balancing point amount and forming the sawtooth stitching by the balancing point motor to the impulse motor of balancing point special use etc., that is, the Sewing machines that usually is known as electronic type sawtooth chain stitch sewing machine is known by everybody.

(for example, with reference to patent documentation 1)

[patent documentation 1]

The spy opens the 2000-1310 communique

But, such as detailed in the following, on above-mentioned electronic type sawtooth chain stitch sewing machine in the past, just switched the balancing point amplitude after the balancing point direction, produce sometimes than the little discomfort of balancing point amplitude when the same direction balancing point.

For example, 4 certain sawtooth stitchings of balancing point width h (for example 3.0mm) of making width W (for example 9.0mm), 1 pin between left end swing position E and the right-hand member swing position F, it is desirable to as shown in Figure 5, each needle falling point should form the beautiful stitching of uniformly-spaced arranging on a vertical straight line.

But, in fact, identical and when carrying out balancing point when the drive amount that makes each pin of balancing point motor, as shown in Figure 6, carry out the balancing point direction and switched initial balancing point width (the balancing point width between each needle falling point No.3-4, No.6-7, the No.9-10) later on, become the balancing point width (for example 2.8mm) shorter than the balancing point width between other needle falling points (for example 3.0mm), and needle falling point is not aligned point-blank, and the stitching width shortens to Wo (8.8mm), produces the so-called bad situation that forms ugly stitching.

Its reason is, usually since when the balancing point direction reverse balancing point position because of the reaction force and the inertia force instability of needle vibrating mechanism, so before the balancing point position stability, produce with regard to falling pin.Particularly on the industrial sewing machines of machine spindle, because the moment of the pin that falls is very fast, so be easy to generate above-mentioned bad situation with rotation at a high speed.

On electronic type sawtooth chain stitch sewing machine in the past, for corresponding to such discomfort, or attenuating Sewing machines speed is made, or one side tries to stitch the operation of the needle downing position of each pin being imported setting on one side on Sewing machines repeatedly, in any case, all caused the reduction of sewing efficiency significantly.

The object of the present invention is to provide a kind of on electronic type sawtooth chain stitch sewing machine, can not cause the reduction of sewing efficiency and can form the electronic type sawtooth chain stitch sewing machine of beautiful sawtooth stitching.

Summary of the invention

The present invention's 1 described electronic type sawtooth chain stitch sewing machine, have: the eedle that the rotation by machine spindle moves up and down, the cloth-feeding device that moves up and down and explicitly sewn object is carried to cloth feeding direction with eedle, make described eedle at the balancing point device that on the direction vertical, moves back and forth with described cloth feeding direction, stitching data according to decision balancing point amount, the balancing point amount that control is undertaken by described balancing point device, form the sawtooth stitching, it is characterized in that, have: to switching the decision mechanism of judging from a direction the opposing party by the implementation balancing point direction of described balancing point device, with balancing point amount correction mechanism, this balancing point amount correction mechanism, control described balancing point device, so that when judging by described decision mechanism, to be formed on the initial stitching after the balancing point direction is switched by the balancing point amount of described stitching data decision as revising the balancing point amount and carrying out balancing point.

1 described electronic type sawtooth chain stitch sewing machine according to the present invention, automatically control the balancing point device, be judged as by the implementation balancing point direction of described balancing point device from switching period of a direction the opposing party or when having switched with box lunch, balancing point amount correction mechanism, to revise the initial stitching after the balancing point amount is carried out balancing point and formed the switching of balancing point direction, so, can provide a kind of operator needn't reduce Sewing machines speed or make the stitching data, can not cause the reduction of sewing efficiency and can form the electronic type sawtooth chain stitch sewing machine of sawtooth stitching attractive in appearance.

The present invention's 2 described electronic type sawtooth chain stitch sewing machines, be the present invention 1 in, it is characterized in that: the correction set mechanism that also has the correction balancing point amount of setting described regulation.

According to the present invention 2, a kind of electronic type sawtooth chain stitch sewing machine is provided, the correction balancing point amount of afore mentioned rules can be set at arbitrary value, so, even for example, because of changing for a long time in Sewing machines year or repairing etc., variation has taken place in the characteristic of needle vibrating mechanism, also can be according to the characteristic of Sewing machines at that time, the correction balancing point amount of afore mentioned rules is set at suitable numerical value.

The present invention's 3 described electronic type sawtooth chain stitch sewing machines, be the present invention 1 in, it is characterized in that: also have the speed testing agency of the rotary speed that detects described main shaft,, change the correction balancing point amount of described balancing point amount correction mechanism according to the detected speed of described speed testing agency.

According to the present invention 3, a kind of electronic type sawtooth chain stitch sewing machine can be provided, the speed of machine spindle can change the correction balancing point amount of above-mentioned balancing point amount correction mechanism according to the speed of machine spindle, so no matter how, can both be modified to the balancing point amount suitable amount.

The present invention's 4 described electronic type sawtooth chain stitch sewing machines, be the present invention 1 in, it is characterized in that: also have and will the control of described balancing point device be set at effective, invalid set mechanism by described balancing point amount correction mechanism.

According to the present invention 4, in the end of making sewn object etc., in the time of need forming the sawtooth stitching with low speed, in order to prevent to make the stitching misalignment on the contrary with balancing point amount correction mechanism, it is invalid balancing point amount correction mechanism can be made as, and can provide a kind of versatility high electronic type sawtooth chain stitch sewing machine.

Description of drawings

Fig. 1 is an outside drawing of using electronic type sawtooth chain stitch sewing machine of the present invention.

Fig. 2 is the structure chart of needle vibrating mechanism.

Fig. 3 is the calcspar of major part of control system of the electronic type sawtooth chain stitch sewing machine of presentation graphs 1.

Fig. 4 is the control flow chart of expression electronic type sawtooth chain stitch sewing machine of the present invention.

Fig. 5 is the correct stitching figure that expression forms with electronic type jaggies mark Sewing machines.

Fig. 6 is the stitching figure that expression uses electronic type sawtooth chain stitch sewing machine in the past to form.

Among the figure: 1-master's motor, 2-shank, 3-eedle, 4-needle plate, 10-guidance panel, 11-balancing point motor, 13-origin sensor, 20-pedal sensor, 21-control device, 21a-Sewing machines rotation control part, 21b-balancing point control part, 23-synchronized, 25-balancing point drive circuit, 26-memory.

The specific embodiment

Below, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In Fig. 1, be supported in eedle 3 on the shank 2 and drive by the machine spindle (not shown) that is connected with the interior main motor 1 that is loaded on Sewing machines and move up and down.The interlock and haunt needle plate 4 of moving up and down of the feed dog of cloth-feeding device (not shown) and this eedle 3 is carried the cloth of being pushed by pressure foot 5 (sewn object) with this, and is formed stitching with the co-operating with cloth-feeding device on cloth.

The sewing cloth feed amount of cloth can be set with cloth feed amount dial 6, and the reinforcing seam that when sewing beginning or sewing end, carries out, be to set reinforcing seam cloth feed amount with reinforcing seam dial 7, when sewing beginning or sewing finish, drive and backstitch solenoid 27 and drive cloth-feeding device and carry out with the cloth feed amount that is set.

Reinforce the seam cloth feed amount, can be set at and fall cloth feed amount from maximum is zero.In addition, the 9th, power switch, the 10th, the guidance panel that carries out various settings.

In Sewing machines of the present invention, be provided with needle vibrating mechanism (balancing point device) as shown in Figure 2, on the shank 2 that supports eedle 3, (for example connecting by the balancing point motor, stepper motor or servo motor) 11 linkages 12 that drive, it also can carry out reciprocal balancing point motion to the direction vertical with cloth feeding direction (direction of arrow of Fig. 2) synchronously with the work feed action of cloth-feeding device.Can form the balancing point stitching of stitching data (balancing point data) according to the rules with this.On needle vibrating mechanism, be provided with the origin sensor 13 of the shutter 11a of rotation when detecting, to detect the initial point of balancing point position with 11 rotations of balancing point motor.

In Fig. 3, represented the control system of Sewing machines with calcspar, on Sewing machines, be provided with the control device 21 that constitutes by Sewing machines rotation control part 21a that constitutes jointly with CPU and balancing point control part 21b (arithmetical organ, decision mechanism, controlling organization).

Pedal sensor 20, be the sensor that detects the amount of pedal operation of Sewing machines pedal (not shown), its export respectively with the Sewing machines rotate instruction of stepping on before the Sewing machines pedal, the tangent line stepped on the Sewing machines pedal instruct, the Sewing machines halt instruction of usefulness Sewing machines pedal neutrality.And, pedal sensor 20, the amount of stepping on before the detection Sewing machines pedal, and to the instruction of Sewing machines rotation control part 21a output speed.

Then, according to signal from pedal sensor 20, from Sewing machines rotation control part 21a by machine spindle drive circuit 22 to main motor 1 output drive signal and drive main motor 1.Be driven with this machine spindle, feed dog carries out so-called 4 connecting rod work feeds motion, with the cloth feed amount work feed of work feed dial 6 settings, and eedle 3 is moved up and down.

Be located at the synchronized 23 on the main shaft, it surveys the regulation rotatable phase (position) of main shaft, and detection is equivalent to the eedle position signalling of the upper-lower position of eedle 3, or detect the speed of main shaft by the rotating speed of detected main motor 1, this eedle position signalling or speed detection signal are input among Sewing machines rotation control part 21a and the balancing point control part 21b.

Balancing point control part 21b drives balancing point motor 11 by balancing point drive circuit 25, and accepts the signal of origin sensor 13 and control needle vibrating mechanism.

When reinforcing, backstitch solenoid 27 actions and reinforce the cloth feed amount work feed with reinforcing 7 settings of seam dial.

Guidance panel 10, be provided with display part and various switch, be used for selecting to be stored in advance the stitching data of the various sawtooth stitchings (2 sawtooth stitchings, sawtooth stitching, flounce shapes are made) of memory 26 at 3, set the order of making of selecteed sawtooth stitching, or carry out the editor of stitching data.And be used to set Sewing machines and control necessary various control data, as required, these data of having set temporarily are stored in the memory 26.In these control datas, as described later, comprised whether be after balancing point direction with the correction correction balancing point device of regulation is switched, the setting data of initial balancing point amount, and the correction correction data of decision regulation, aforesaid operations panel 10 (set mechanism, correction set mechanism) also uses when the setting of these setting datas or correction data.

In addition, in memory 26,, stored corresponding to above-mentioned machine spindle speed and the correction when changing the correction of afore mentioned rules according to machine spindle speed.

Below, at first form being example with 4 sawtooth stitchings of routine key diagram 5 in the past, describe the action of playing as the balancing point control part 21b of balancing point amount correction mechanism of the present invention effect in detail with reference to accompanying drawing.

At this, the operator is before making, select 4 sawtooth stitchings shown in Figure 5 by manipulation operations panel 10, then, the datum line benchmark is set at makes said reference line position data B (0mm) be positioned at central authorities on the stitching data (central reference line, represent) position with dot-dash M.

For the datum line benchmark, can be set at other left datum line (the straight line E with the stitching left-hand end is reference position (0mm on the data)), and right datum line (the straight line F with the stitching right-hand end is reference position (0mm on the data)), and can form stitching in right side or the left side of datum line C respectively, but in the explanation of present embodiment, for the purpose of simplifying the description the datum line benchmark is set at the central reference line, as shown in Figure 5, be that left and right sides balancing point is carried out at the center with datum line C.In addition, in Fig. 5, datum line C and the dot-dash M that represents the datum line benchmark are for convenience of description and separately expressions, but are actually same straight line.

At this moment, in memory 26, as the stitching data that are used to form 4 sawtooth stitchings, stored shape data N (N=4), stitch wide data W (=9mm), datum line position data B (position of the balancing point direction of the datum line C that represents with chain-dotted line).

In the stitching data that stored stitching shape and balancing point width, because they are relative quantities, so the necessary balancing point datum line position of setting with respect to needle vibrating mechanism.The datum line position, usually, as having stipulated each stitching shape with respect to the absolute position of the balancing point center of the machinery of needle vibrating mechanism, in the present embodiment, the datum line position of 4 sawtooth stitchings is made as 0 (B=0mm), that is, is stored with the balancing point center of machinery.

At first, in step S1 (Fig. 4), the pin register D that will fall is initialized as 1.The balancing point that this pin register D that falls is the numerical value that uses when when forming the sawtooth stitching balancing point direction being changed to other directions, be used for a direction of subtend begins the later pin time counting number and switch the balancing point direction in the moment that is reaching above-mentioned shape data N when the pin number of times that fall of falling.

Subsequently, in step S2, read in correction F from memory 26.This correction F (for example, F=0.2mm), be according to the characteristic of Sewing machines and in predefined value of the fabrication stage of Sewing machines, switch to from a direction by the balancing point direction another direction later, by the balancing point amount of initial stitching data decision on the value of addition.In addition,, can change the setting of this correction F by operating operation panel 10, even when Sewing machines changes with age, repairing etc., when the characteristic of needle vibrating mechanism changes, also can be according to the correction of at that time Sewing machines property settings afore mentioned rules.

Then, in step S3, read in selecteed shape data N (4), pin pendulum width W (9mm), datum line position B (0mm), datum line benchmark (central reference line).Shape data N is the standard stitching as 2 sawtooth stitching～4 sawtooth stitching, as with the balancing point interval of a direction in the consistent numerical value of pin number of times that falls be read into, when having read in shape data N, form the stitching of N point sawtooth stitching.

Then, in step S4, calculate the balancing point amount L (3mm) of a pin.The balancing point amount L of one pin is that (during 4 sawtooth stitchings, 4-1=3) (=9mm) result is the balancing point amount that is formed at the adjacent needlework mark between the pin that falls divided by pin pendulum width W with the pin times N-1 that falls.

Then, in step S5, carry out the detection of stepping on before the pedal according to the signal from pedal sensor 20, detect and enter step S6 when stepping on before being, main motor 1 rotation is also carried out the initial pin that falls at the needle falling point 0 of Fig. 5.

Then, in step S7, the balancing point amount L (3mm) that calculates in step S4 is as the balancing point amount H of the 1st pin, and enters step S8.

Then, in step S8, pass through balancing point drive circuit 25 to balancing point motor 11 output drive signals, and only carry out the balancing point of balancing point amount H (3mm) from balancing point control part 21b.And with the moving of balancing point amount H, that ends at eedle 3 moves up and down the position during on the needle plate with the eedle of balancing point motor 11, subsequently, in step S9, eedle is descended and is carried out the initial pin that falls at the needle falling point 1 of Fig. 5 by the rotation of main motor 1.

Then, in step S10, when detecting the eedle upper/lower positions, enter step S11 with synchronized 23, the pin register D that falls only be coupled with 1 (stage of the pin that on needle falling point 1, falls, D=2).

Then, in step S12, judge once more according to the signal of pedal sensor 20 whether the Sewing machines pedal is preceding stepped on,, enter step S19, judged whether to carry out stepping on of Sewing machines pedal when being judged as when negating.In step S19, if sure judgement then enters step S20, and carry out tangent line, and finish a series of processing with not shown thread cutting device.

On the other hand, in step S19, if be judged as negative, promptly be judged as and do not carry out stepping on of pedal, then be operated and be positioned at the neutral position as the Sewing machines pedal, enter step S21 and from Sewing machines rotation control part 21a, by machine spindle drive circuit 22 to main motor 1 output halt instruction and be positioned at sewing machine needle 3 under the state of upper/lower positions and stop Spindle Motor 1, then, enter step S12 once more, judge whether the Sewing machines pedal is preceding stepped on.

In step S12, before stepped on as if being judged as certainly, promptly being judged as Sewing machines pedal quilt, then enter step S13.In addition, in the following description, in step S12, being that affirmative determination describes often.

In step S13, judge whether the pin register D that falls is consistent with shape data N (4).At this moment, negative if the pin that also do not fall was judged as in the stage of needle falling point 1 (D=2), then enter step S18, the balancing point amount L that will calculate in step S4 is set at the balancing point amount H to the pin that falls next time again.

Then, enter step S8 once more, the processing of carrying out step S8～step S14 repeatedly up in step S13 by affirmative determination till.In addition, when being 4 sawtooth stitchings, because shape data N=4, so in step S13, so-called affirmative determination is in the position that falls pin register D=4, the needle downing position of this moment is the position when arriving the needle falling point 3 of Fig. 5.In addition, in the present embodiment, the processing of step S13, also double as is the balancing point direction decision mechanism (decision mechanism) that judges whether to have switched with the balancing point direction of needle vibrating mechanism swing.

In step S13, when being affirmative determination, entering step S14 when promptly in Fig. 5, having formed the stitching of needle falling point 3 that the pin register D that will fall once more is initialized as 1 in order to switch the balancing point direction next time.

Then, in step S15, the balancing point direction of needle vibrating mechanism is switched to the direction (the opposing party) shown in the arrow L from the direction (side) shown in the arrow R of Fig. 1.And, the switching of this balancing point direction, concrete is to be undertaken by the direction of rotation counter-rotating that makes balancing point motor 11 by balancing point control part 21b.

Then.Enter step S16, the machine spindle speed that the synchronized 23 that is used as speed testing agency is detected and the rotating speed (for example 500rpm) of regulation relatively when the speed that is judged as machine spindle is higher than the rotating speed of regulation, then enter step S17.

In step S17, the balancing point amount H of a pin (is made as L for simplicity on will calculating in step S4, the balancing point amount L+ correction F (3.2mm) of a pin balancing point amount (revise balancing point amount) the last pin of H=that adds the correction F (0.2mm) that reads in 3mm) in step S2 is as the balancing point amount H to a pin of the pin that falls next time, and enters step S8.

In step S8, balancing point amount ((revising the balancing point amount) H=(L+F)=3.2mm) driving balancing point motor 11 according to a pin of in step S 17, setting, and carry out balancing point to the balancing point direction that in step S15, is switched, enter step S9, carry out the balancing point and the pin that falls between the needle falling point 3～4 of Fig. 5.

Like this, on balancing point amount (L=3mm), to add that the correction balancing point amount H (L+F=3.2mm) that correction (F=0.2mm) is calculated carries out balancing point by a pin of the stitching data of 4 sawtooth stitchings decision, like this, the balancing point amount of the initial stitching after the balancing point direction is switched (the balancing point amount between the needle falling point 3～4 of Fig. 6), on electronic type sawtooth chain stitch sewing machine in the past is 2.8mm, but Shi Ji balancing point amount can be the 3mm with the balancing point amount of stitching data decision in the present embodiment.

Subsequently, enter step S13 later in the processing of having carried out step S10～step S12, this time, the pin register D=1 owing to fall is so in step S13, be judged as negative, and enter step S18, as the balancing point amount of pin (needle falling point 5) that be used for falling next time, the correction balancing point amount H (L+F=3.2mm) that will set in step S17 in the time of will falling pin on previous needle falling point 4 is set at the balancing point amount L (3mm) that calculates once more in step S4.

Then,, carry out balancing point as balancing point amount H (3mm) with stitching data decisions according to the processing of step S8, and in step S9 the pin that falls on needle falling point 5.

On the other hand, in step S16, be judged as negative, that is, and when the speed that is judged as machine spindle than the speed of regulation (for example, when 500rpm) hanging down, enter step S 18, do not carry out the correction of balancing point amount, as the balancing point amount H of the pin that is used for falling next time, in step S4, set the balancing point amount L that is calculated once more, enter step S8.

Like this, even the reason of also not carrying out the correction of balancing point amount after the balancing point direction is switched, when machine spindle speed is hanged down than the speed of regulation, after being that the balancing point direction is switched, if some times of process are the balancing point position stability then, so if revise when the machine spindle low speed rotation that the pin that falls latens constantly, then big the and stitching of balancing point quantitative change does not on the contrary line up yet.

After, repeat same processing, form stitching as shown in Figure 5.

More than, according to embodiment the present invention has been described, but the present invention is not limited to the foregoing description, can in the scope that does not break away from its aim, carry out various distortion.

For example, if it is effective or invalid to establish the correction of top balancing point amount with operating operation panel 10, then when in the end of making sewn object etc., in the time of must forming the sawtooth stitching with low speed, for prevent with balancing point amount correction mechanism on the contrary stitching do not line up, it is invalid balancing point amount correction mechanism can be made as, and can provide versatility high electronic type sawtooth chain stitch sewing machine.

In addition; in the above-described embodiments; what illustrate is situation when forming 4 jaggies trace marks; but the present invention; also go for being formed on 2 sawtooth stitchings or 3 sawtooth stitchings; perhaps scallop stitch, and, on each needle downing position, set balancing point amount arbitrarily and form the situation of the various stitchings of customization pattern of being formed etc.

In addition, in the above-described embodiments, the judgment processing of balancing point direction in step S13 being switched with whether, be used for and judge in the balancing point direction decision mechanism that switches the balancing point direction of being undertaken by the balancing point device, but this balancing point direction decision mechanism, be not limited to present embodiment, for example, also output can be moved is that 90 encoders of spending different two-phase pulses are connected with the balancing point motor, judges the switching of balancing point direction by judge the direction of rotation of balancing point motor according to this two-phase pulse.Perhaps, as the balancing point data of customization pattern, when storing the balancing point position of each needle downing position, also can calculate balancing point amount on the needle downing position, and judge the switching of balancing point direction with the sign symbol of this balancing point amount according to the difference of adjacent balancing point position.

In addition, in the present embodiment, be that the rotary speed of judging machine spindle surpasses fixing speed, on the balancing point amount, add correction, when the rotary speed deficiency fixing speed of machine spindle, the formation of not revising, but also can be the many grades of rotary speeies of judging machine spindle, and change the formation of correction according to the rotary speed of machine spindle.

(invention effect)

According to the present invention, because on electronic double diagonal stitch sewing machine, automatically control the balancing point device, can make balancing point amount correction mechanism, when having judged with balancing point device switching balancing point direction, carry out balancing point and be formed on the balancing point direction switching later initial stitching to revise the balancing point amount, so, can provide a kind of operator needn't reduce sewing machine speed or making stitching data, can not cause sewing efficiency to reduce and can form the electronic double diagonal stitch sewing machine of sawtooth stitching attractive in appearance.

In addition, according to the present invention, owing to have the correction set mechanism of setting for the correction of revising the balancing point amount that forms the initial stitching after the balancing point direction is switched, even so because changing for a long time in sewing machine year or variation has taken place the characteristic of the needle vibrating mechanism such as repairing, also can be according to the characteristic of sewing machine at that time, the correction of afore mentioned rules is set at suitable numerical value.

In addition, according to the present invention, because the correction of correction set mechanism, change according to the speed of machine spindle, so can provide a kind of no matter the speed of machine spindle how, can be modified to the balancing point amount electronic double diagonal stitch sewing machine of suitable numerical value.

And, in the present invention, make the end etc. of sewn object, when forming the sawtooth stitching with low speed, can to make on the contrary the stitching misalignment and balancing point amount correction mechanism is made as invalid with balancing point amount correction mechanism in order to prevent when needs, provide versatility high electronic double diagonal stitch sewing machine.

Claims

1. electronic type sawtooth chain stitch sewing machine has:

The eedle that rotation by machine spindle moves up and down,

The cloth-feeding device of sewn object being carried to cloth feeding direction with moving up and down explicitly of eedle,

Make described eedle at the balancing point device that on the direction vertical, moves back and forth with described cloth feeding direction,

Balancing point amount according to the stitching Data Control of decision balancing point amount is undertaken by described balancing point device forms the sawtooth stitching, it is characterized in that having:

To the balancing point direction that drives by described balancing point device from a direction the opposing party switch the decision mechanism judged and

Balancing point amount correction mechanism, this balancing point amount correction mechanism is controlled described balancing point device, so that when being judged by described decision mechanism, to be formed on the initial stitching after the balancing point direction is switched by the balancing point amount of described stitching data decision as revising the balancing point amount and carrying out balancing point.

2. electronic type sawtooth chain stitch sewing machine according to claim 1 is characterized in that: the correction set mechanism that also has the correction balancing point amount of setting described regulation.

3. electronic type sawtooth chain stitch sewing machine according to claim 1 is characterized in that: also have the speed testing agency of the rotary speed that detects described main shaft,

According to the detected speed of described speed testing agency, change the correction balancing point amount of described regulation.

4. electronic type sawtooth chain stitch sewing machine according to claim 1 is characterized in that: also have and will the control of described balancing point device be set at effective, invalid set mechanism by described balancing point amount correction mechanism.