CN110512345A - A Calculation Method of Yarn Feed Volume in Positive Yarn Feed Mode of Circular Weft Machine - Google Patents

Abstract

The invention discloses a method for calculating the yarn feeding amount of a circular weft machine in a positive yarn feeding mode. By calculating the yarn length of a certain number of knitting needles knitting the loop structure, the yarn storage wheel can change the yarn feeding amount according to the yarn length required for knitting during the knitting process, so as to ensure that the tension of the yarn entering the knitting area is constant and reduce the gap between the same loops. The size difference between them makes the pattern clearer and the cloth surface smoother, which greatly improves the quality and aesthetics of the fabric.

Description

A Calculation Method of Yarn Feed Volume in Positive Yarn Feed Mode of Circular Weft Machine

technical field

The invention relates to a method for calculating the yarn feeding amount in a positive yarn feeding mode of a circular weft machine, belonging to the technical field of textile processing.

Background technique

The yarn feeding mechanism is an important device of the circular knitting machine. At present, most of the jacquard circular weft machines use passive yarn feeding, and the yarn is withdrawn from the creel and led to the weaving area by means of the tension generated by the loop forming parts on the yarn during weaving. Change the yarn feeding speed according to the different instantaneous yarn consumption, but the tension will fluctuate when the yarn enters the weaving area, which will cause a certain difference in the size of the coil and affect the smoothness of the cloth surface.

Contents of the invention

In order to overcome the deficiencies of the prior art, the present invention provides a calculation method for the yarn feeding amount of the active yarn feeding mode of the circular weft machine.

The present invention is achieved through the following technical solutions:

A method for calculating the yarn feeding amount of a circular weft machine in an active yarn feeding mode, comprising the following steps:

(1) The pattern process is imported into the computer-aided system of weft knitted fabrics, and the system obtains the organizational structure of the pattern;

(2) By selecting the machine number of the circular weft machine and the depth of the triangular bending yarn of the loop forming system, the length of the single loop structure yarn is determined when the yarn is knitted into loops, tucks and floats;

(3) According to the maximum speed of the circular weft machine and the total number of needles of the machine, calculate the time required for one knitting needle to complete the coil knitting when the circular weft machine is running at the highest speed;

(4) According to the response frequency of the servo motor of the circular weft machine, the response time of the servo motor is known;

(5) According to the response time of the servo motor and the time required for a knitting needle to complete the coil weaving when the machine is running at the highest speed, calculate the minimum number of knitting needles whose knitting needle completes the coil weaving time greater than the response time of the servo motor;

(6) Select the knitting needles that are not less than the minimum number of knitting needles calculated in (5), and the knitting needles go through the loop forming system for loop knitting, and the length of the yarn required when the knitting is completed;

(7) Obtain the yarn feeding amount of the yarn storage wheel according to the required yarn length when weaving is completed.

The method for calculating the amount of yarn feeding in a positive yarn feeding mode of a circular weft machine is to select the yarn length required for knitting needle knitting that is not less than the minimum number of knitting needles calculated in step (5) to correspond to the yarn storage wheel yarn feeding quantity.

In the method for calculating the yarn feeding amount of a circular weft machine in an active yarn feeding mode, in step (6), the number of knitting needles is selected to be equal to the minimum number of knitting needles calculated in step (5).

In the method for calculating the yarn feeding amount of the active yarn feeding mode of a circular weft machine, in step (1), while the system obtains the pattern structure, it decomposes the pattern to obtain a weaving diagram.

The beneficial effect that the present invention reaches:

By calculating the yarn length of a certain number of knitting needles knitting the loop structure, the yarn storage wheel can change the yarn feeding amount according to the yarn length required for knitting during the knitting process, so as to ensure that the tension of the yarn entering the knitting area is constant, and the difference between the same loops can be reduced. The size difference between them makes the pattern clearer and the cloth surface smoother, which greatly improves the quality and aesthetics of the fabric.

The calculation method of the present invention is simple, and the yarn feeding amount transported by the yarn storage wheel according to needs can be obtained, which greatly improves the speed and quality of fabric processing.

Description of drawings

Fig. 1 is a calculation flow chart of the calculation method of the positive type yarn feeding mode yarn feeding amount of a kind of jacquard circular weft machine of the present invention;

Fig. 2 is the pattern sketch of fabric in embodiment 1.

Fig. 3 is the pattern sketch of fabric in embodiment 2.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

Example 1

A method for calculating the yarn feeding amount of a jacquard circular weft machine using a positive yarn feeding method, the steps are:

(1) The selected machine is the Meyersey Relanit 1.6ER four-tone thread jacquard weft knitting machine. The specific parameters are as follows: cylinder diameter 30 inches; machine number E28; needle selection device 3 positions; number of yarn feeding paths 48; The number is 2592; the maximum speed is 15 rpm.

(2) The fabric weave is two-color single-sided jacquard, and the pattern is shown in Figure 2:

(3) According to the pattern process, the flower width and flower height of the pattern are both 12, the odd-numbered path wears 1 colored yarn, the even-numbered path wears 2 colored yarns, and 2-way knits a complete coil course, and a complete weave requires 24 lines .

(4) According to the machine number E28 and the set knitting system triangular bending depth, the estimated length of the single loop structure of yarn knitting is: knitting 2.5mm, tucking 1.5mm, and floating line 0.8mm.

(5) The maximum speed of the machine is 15 revolutions/min, and the total number of needles of the machine is 2592. Assuming that the machine moves at a maximum speed of 15 revolutions/min, it takes 4 seconds for the machine to rotate one circle, and the time required for one knitting needle to complete the knitting of the loop is (4/2592 ) S.

(6) If the response frequency of the servo motor installed on the yarn storage wheel is 200HZ, the response time of the servo motor is 0.005S.

(7) When the machine is moving at the highest speed of 15 rpm, the time required for 3 knitting needles to complete loop knitting (12/2592) is less than the response time of the servo motor 0.002S, and the time required for 4 knitting needles to complete loop knitting (16 /2592) is greater than the response time of the servo motor by 0.005S, and the minimum number of knitting needles is 4 when the knitting needle completes loop knitting time is greater than the response time of the servo motor.

(8) Select 4 knitting needles for loop knitting, and calculate the length of yarn required when the knitting is completed.

(9) Taking the yarn feeding amount of the yarn storage wheel of the 10th knitting system as an example, every 4 knitting needles are used for loop knitting, and the loop structure is loop + loop + loop + loop, float + float + Tuck + floating thread, floating thread + floating thread + looping + looping, weaving in turn, the required yarn lengths are 10mm, 3.9mm, 6.6mm, in turn.

(10) Every 4 knitting needles of the 10th knitting system carry out coil knitting. The yarn feeding amount of the yarn storage wheel is 10mm, 3.9mm, 6.6mm in turn, and the cycle is repeated in turn.

Example 2

A method for calculating the yarn feeding amount of a jacquard circular weft machine using a positive yarn feeding method, the steps are:

(1) The selected machine is Runshan RSL double-sided computerized jacquard machine. The specific parameters are as follows: cylinder diameter 34 inches; machine number E32; needle selection device 3 positions; number of yarn feeding paths 72; total number of needles 3408; maximum speed 15 rpm.

(2) The weave of the fabric is two-color double-sided jacquard, and the reverse side is a sesame dot effect. The pattern is shown in Figure 3.

(3) According to the pattern process, the flower width and flower height of the pattern are both 8, the odd-numbered way wears 1 colored yarn, the even-numbered way wears 2 colored yarns, and 2-way weaves a complete coil course, and a complete weaving requires 16 lines .

(4) According to the machine number E32 and the set knitting system triangular bending depth, the estimated length of the single loop structure of yarn knitting is: knitting 2mm, tucking 1.2mm, and floating line 0.6mm.

(5) The maximum speed of the machine is 15 revolutions/min, and the total number of needles of the machine is 3408. Assuming that the machine moves at a maximum speed of 15 revolutions/min, it takes 4 seconds for the machine to rotate one circle, and the time required for one knitting needle of the needle cylinder to complete the knitting of the loop is (4 /3408) S.

(6) If the response frequency of the servo motor installed on the yarn storage wheel is 100HZ, the response time of the servo motor is 0.01S.

(7) When the machine moves at the highest speed of 15 rpm, the time (32/3408) required for 8 knitting needles of the needle cylinder to complete loop knitting is less than 0.01S for the response time of the servo motor, and the time required for 9 knitting needles of the needle cylinder to complete coil knitting If the time (36/3408) is greater than the response time of the servo motor by 0.01S, then the minimum number of knitting needles is 9 when the time for the knitting needles to complete the knitting of the loop is greater than the response time of the servo motor.

(8) Select 10 cylinder knitting needles for coil knitting, and calculate the length of yarn required when the knitting is completed.

(9) Taking the yarn feeding amount of the yarn storage wheel of the 7th loop forming system as an example, every 10 cylinder knitting needles are used for loop knitting, and the loop structure of the cylinder knitting needles is 8 loops + 2 floats, 7 loops + 3 floats, 7 loops + 3 floats, 8 loops + 22 floats, weaving in turn, and the loop structure formed by the 10 dial knitting needles corresponding to every 10 cylinder knitting needles is 5 loops +5 floating thread, the required yarn lengths are 30.2mm, 28.8mm, 30.2mm, 28.8mm in sequence, and the cycle reciprocates in turn.

(10) The 7th road knitting system performs loop knitting with every 10 knitting needles, and the yarn feeding amount of the yarn storage wheel is 30.2mm, 28.8mm, 30.2mm, 28.8mm in sequence, and it goes back and forth in turn.

The above is only a preferred embodiment of the present invention, and it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, some improvements and modifications can also be made. It should also be regarded as the protection scope of the present invention.

Claims (4)

1. a kind of calculation method of circular knitting machine active yarn transmission mode thread-feeding amount, which is characterized in that including the following steps:

(1) flower pattern technique imports weft-knitted fabric computer aided system, and system obtains the institutional framework of flower pattern；

(2) by selecting the machine number and cam system triangle sinking depth of circular knitting machine, determining yarn in braiding lopping, tuck and floating When line, single coil structure length of yarn；

(3) according to circular knitting machine maximum speed and machine total needle amount, when calculating circular knitting machine is run with maximum speed, one piece of knitting needle is completed The time that coil braid needs；

(4) according to circular knitting machine servo motor response frequency, the response time of servo motor is learnt；

(5) when being run according to servo motor response time and machine with maximum speed one piece of knitting needle complete that coil braid needs when Between, it calculates knitting needle and completes the minimum knitting needle quantity that the coil braid time is greater than the servo motor response time；

(6) knitting needle not less than the minimum knitting needle quantity numerical value calculated in (5) is chosen, knitting needle carries out coil volume by cam system It knits, the length of yarn that braiding needs when completing；

(7) length of yarn needed when being completed according to braiding obtains the thread-feeding amount of yarn storage wheel.

2. a kind of calculation method of circular knitting machine active yarn transmission mode thread-feeding amount according to claim 1, which is characterized in that with Selection corresponds to yarn storage wheel not less than the length of yarn of the knitting needle braiding needs of the minimum knitting needle quantity numerical value calculated in step (5) and send Yarn amount.

3. a kind of calculation method of circular knitting machine active yarn transmission mode thread-feeding amount according to claim 1, which is characterized in that step Suddenly it in (6), chooses knitting needle numerical value and is equal to the minimum knitting needle quantity calculated in step (5).

4. a kind of calculation method of circular knitting machine active yarn transmission mode thread-feeding amount according to claim 1, which is characterized in that step Suddenly it in (1), while system obtains flower pattern institutional framework, carries out flower pattern and decomposes to obtain weave diagram.