CN102535048A

CN102535048A - Upper shaft rotation speed control method of sewing machine

Info

Publication number: CN102535048A
Application number: CN2011104435916A
Authority: CN
Inventors: 李昌永
Original assignee: Sunstar Co Ltd
Current assignee: Sunstar Co Ltd
Priority date: 2010-12-31
Filing date: 2011-12-27
Publication date: 2012-07-04
Anticipated expiration: 2031-12-27
Also published as: KR20120077868A; DE102011057145A1; CN102535048B

Abstract

The present invention relates to an upper shaft rotation speed control method which is suitable for a pattern sewing machine and is based on a rotation amount of a machine head. The upper shaft rotation speed control method comprises the following steps: a step of referring a pattern program which controls sewing action of a pattern sewing machine and obtaining speed reduction starting time before machine head rotation command generation time for N stitches; a step of gradually reducing the rotation speed of the upper shaft between the speed reduction starting time and performing of machine head rotation command; a step of rotating the machine head by means of the machine head rotation command; and a step of gradually increasing the speed of the rotation speed of the upper shaft after rotation of the machine head is finished. According to the upper shaft rotation speed control method of the sewing machine, rotation of the machine head is performed after rotation speed of the upper shaft is reduced to the speed which is appropriate for machine head rotation, and therefore sewing can be performed when the sewing quality is not affected by rotation angle change.

Description

The upward axle revolution speed control method of Sewing machines

Technical field

The present invention relates to a kind of Sewing machines, an especially a kind of revolution speed control method of going up based on the head amount of circling round with rotatable machine heads.

Background technology

Sewing machines with rotatable machine heads is utilizing anchor clamps (clamp) fixedly behind the sewing piece on the workbench (Table), order about above-mentioned anchor clamps and move and sew in the X-Y direction.

Fig. 1 is the outward appearance of existing sewing machine head lifting type Sewing machines, and Fig. 2 is stitching (stitch) the formation state of device shown in Figure 1 based on style (Pattern).The left side of Fig. 2 d is the rhombus style, and the right side is the rectangle style.

Arrow representes to form the travel direction of style, the quality of P (zero defect (Perfect)), H (part defective (Half perfect)) expression stitching.

P representes impeccable stitching, and H representes to have a little the stitching of defective, and Hitch Stitch representes to have the stitching of defective.

Fig. 3 has shown the degree of distribution of H-P stitching of each section of device shown in Figure 1.See also Fig. 3, can find out that the stitching quality is along with rising from the field of style inside center and difference.That is, be initial point when being divided into four quadrants with the inner central point of style, can find third quadrant and four-quadrant, especially four-quadrant stitching quality has reduced.

In order to solve this problem of sewing machine head lifting type Sewing machines shown in Figure 1, people have developed the Sewing machines with rotatable machine heads that head is circled round.

As an example, this Sewing machines with rotatable machine heads need let head radially circle round when third quadrant or four-quadrant are sewed as illustrated in fig. 2, has given play to the effect of sewing to second quadrant as at first quartile, thereby has improved sewing quality.

Fig. 4 is that the head with Sewing machines of rotatable machine heads turns to (turning) structure.See also Fig. 4, head unit motor 101 and the ride unit motor 102 that circles round that circles round is installed separately at the upside of the frame 100 of " " font and downside.The ride unit circle round motor 102 along with the head unit circle round motor 101 rotation and rotate, on drawing, be radially to circle round in the center with the vertical axis.Sewing machine head 107 is installed in the circle round bottom of motor 101, head unit, and ride unit 108 is then installed on the circle round top of motor 102, ride unit.Though diagram is not equipped with anchor clamps shown in Figure 1 between sewing machine head 107 and ride unit 108.

Last axis drive motor 105 makes the axle of going up that drives shank be rotated motion.The power vehicle that the rotating tee of last axis drive motor 105 is crossed synchronous band and so on is communicated to axle (not shown).In addition, following axis drive motor 106 synchronously rotates with the rotation of last axis drive motor 105.

At this; The action of Sewing machines relies on the last axle and the rotation of lower shaft to take place, based on circling round that motor 101 and ride unit circle round that the action of sewing machine head 107 and ride unit 108 of motor 102 is also wanted and by last axis drive motor 105 and going up of driving of axis drive motor 106 is spool synchronous with the rotation of lower shaft down in the head unit.

As shown in Figure 4; The circle round rotation of motor 102 of motor 101 and ride unit of circling round of head unit is rotated rotatably and is seemed that it doesn't matter mutually owing to being independent of axle; But; Sewing machine head 107 is with the rotary inertia action based on last axle rotation, the rotary speed that therefore goes up axle with physical constraints based on the circle round amount of motor 101 of head unit.

Therefore, need control the rotary speed of axle according to the head amount of circling round.

Summary of the invention

Invention needs the technical task of solution

For in response to the demand, the purpose of this invention is to provide and a kind ofly have on the Sewing machines of rotatable machine heads the method for controlling the axle rotary speed according to the head amount of circling round.

Solve the technical scheme of problem

Can realize axle method of controlling rotation on the Sewing machines of the present invention of above-mentioned purpose, have according to the amount of the circling round control of head rotatable machine heads Sewing machines go up an axle rotary speed, comprise processes:

The style program of the above-mentioned Sewing machines of reference control sewing action obtains from the head order of circling round the process of the deceleration zero hour before the N stitching constantly taking place;

From above-mentioned deceleration zero hour till carry out head and circle round before the order, the process that a rotary speed that lets spool is slowed down gradually;

The process that relies on above-mentioned head to circle round order and head is circled round;

The head process that the rotary speed that finishes axle on the relief is quickened gradually of circling round.

Preferably, above-mentioned moderating process decelerates to and based on the circle round corresponding rotary speed of the head amount of circling round of order of above-mentioned head.

Beneficial effect

Carry out head after the speed that the present invention lets the rotary speed of axle ease down to be fit to head to circle round and circle round, therefore can under sewing quality is not circled round the situation of angle variable effect, not sew.

Description of drawings

Fig. 1 is the outside drawing of existing sewing machine head lifting type Sewing machines.

Fig. 2 is stitching (stitch) the formation state of device shown in Figure 1 based on style.

Fig. 3 has shown the degree of distribution of H-P stitching of each section of device shown in Figure 1.

Fig. 4 is that the head with Sewing machines of rotatable machine heads turns to (Turning) structure.

Fig. 5 is a method of controlling rotation of going up that the present invention is based on the head amount of circling round.

The explanation of main pictorial symbolization

100: frame

101: motor 102 circles round in the head unit: motor circles round in the ride unit

105: go up axis drive motor 106: following axis drive motor

107: sewing machine head 108: the ride unit

The specific embodiment

The action of existing sewing machine head lifting type Sewing machines and last axle rotation synchronously take place.That is, regularly (Timing) pulse synchronously takes place with the rotation of last axle, carry out required action with the phase place of this commutator pulse as benchmark.

Have the Sewing machines of rotatable machine heads, circling round of head is also synchronous with the rotation of last axle.But, based on the head unit circle round the amount of motor 101 can be along with last axle rotary speed difference.That is the head that is suitable on each the axle rotary speed pulse number that circles round is different.For example, last axle is with 2, is 10 for the circle round number of pulse of the suitable head of a rotation of last axle during the 000rpm rotation, and last axle is with 1, and the circle round number of pulse of suitable head was 15 when 500rpm rotated.This expression need change the rotary speed that goes up axle according to the desired head amount of circling round.

In general, the rotary speed of last axle is low more, and the circle round number of pulse of its corresponding head is many more.That is the rotary speed of last axle is low more, and the circle round amount of circling round based on a driving pulse of motor 101 of head unit can increase.

Need control axle rotation number when therefore, head circles round so that correspondingly let the speed of circling round of axle slow down.Yet in this method, when circling round last rotary speed of synchronously change, can be impacted the reduction gearing that conveys to axle after the rotational delay of last axis drive motor 105 with head.That is the beginning of circling round along with head and applying when moment, deceleration torque was gone up the axle rotary speed to reduce will impact and the adverse consequences that reduction gearing breakage, resistance to impact weaken and so on will take place reduction gearing.Therefore, preferably, change the rotary speed that goes up axle, let an axle rotary speed slow down gradually to avoid giving the reduction gearing impact though circle round according to head.

Fig. 5 is a method of controlling rotation of going up that the present invention is based on the head amount of circling round.See also Fig. 5; The last axle of the present invention method of controlling rotation detected head earlier and whether circles round before the generation head circles round; Decelerate to speed to last axle rotary speed gradually from normal speed corresponding to the head amount of circling round; Till head takes place circling round and order about head and circle round, after circling round and finish, head accelerates to normal speed to last axle rotary speed gradually again.

Sewing machines with rotatable machine heads is sewed according to given style program.Therefore, in the style program with reference to head circle round order occurrence positions and be able to detect head in advance and whether circle round.At the style sewing process, the period that is carved into during detection till the generator head circles round can be by the number performance of stitching (Stitch), and a stitching is equivalent to a rotation of axle.

At first, synchronously detect circle round (s502) constantly of head, that is whether the just inspection that whenever rotates a circle of last axle electric rotating machine is that head circles round before the N stitching in the moment takes place in order with last axle rotation.At this, N is a positive integer.

And " head circles round before the order generation N stitching constantly " is corresponding to the deceleration zero hour in the present invention's summary.

Before the order generation N stitching constantly (s504), then calculate rotary speed if head circles round, promptly be suitable for the target rotational speed (s506) of the head amount of circling round corresponding to the head amount of circling round.The head amount of circling round can reference handpiece be circled round order and is got.

Until till the moment of circling round of head, let an axle rotary speed decelerate to target rotational speed (s508) gradually.

Let head circle round (s510).

Head circles round when finishing, and is letting the rotary speed of axle quicken (s512) during the N stitching.In an embodiment of the present invention, accelerating velocity is the speed before of slowing down, but this speed can optionally give different settings.

Carry out head after the speed that the present invention lets the axle rotary speed ease down to be fit to head to circle round and circle round, therefore can under sewing quality is not circled round the situation of angle variable effect, not sew.

And, let the rotary speed acceleration and deceleration and be able under the situation that does not give the reduction gearing over load to realize that head circles round gradually of axle.

Claims

1. the upward axle revolution speed control method of a Sewing machines has the upward axle rotary speed of the Sewing machines of rotatable machine heads according to the amount of the circling round control of head, it is characterized in that, comprises processes:

Sewing machines according to claim 1 go up an axle revolution speed control method, it is characterized in that:

Above-mentioned moderating process decelerates to and based on the circle round corresponding rotary speed of the head amount of circling round of order of above-mentioned head.