JP2980784B2 - Knitted fabric lowering force control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for controlling the pulling force of a knitted fabric in a flat knitting machine.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication No. 60-259659 discloses a technique for controlling the pulling-down tension of a knitted fabric. In this technique, the pull-down force per knitting needle is set in advance, the number of stitches in each course is obtained from the knitting data, and the pull-down force for each course is determined from the pull-down force per needle and the actual number of stitches. The tension of the knitted fabric is controlled based on the calculated pull-down force.

According to the above-mentioned technique, in the case of a tissue having a plurality of loops per needle in a knitting process such as tacking or stitch reduction, the actual number of needles does not change, but the actual number of needles is substantially reduced. Since the number of loops acting on the knitted fabric is different, it is impossible to set an ideal tension according to the knitting structure, the tension of the knitted fabric is reduced, the formation of the loop becomes uneven, and a knitting error easily occurs. .

[0004]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to set an appropriate pulling-down force in accordance with the number of loops in one course, to eliminate a decrease in the tension of the knitted fabric during the knitting process, and to realize the above-mentioned disadvantages, ie, non-uniform loop formation and knitting. It is to prevent the occurrence of mistakes and the like.

[0005]

According to the present invention, there is provided a knitting data output means for outputting the number of loops per course as knitting data, and a reduction force setting for setting a reference reduction force per unit loop. Means for calculating the output signal of the pulling-down force for the knitted fabric by using the number of loops per course and the reference pulling-down force as input,
A pull-down force adjusting means including a pull-down force applying element for applying a pull-down force to the knitted fabric in accordance with the output signal of the arithmetic means, and by controlling the pull-down force on the knitted fabric according to the number of loops in one course, An appropriate tension is set on the knitted fabric according to the knitting data.

[0006]

1 and 2 show the main mechanical parts of a knitting fabric pulling-down force control apparatus 1 and a flat knitting machine 2 controlled by the apparatus according to the present invention. The knitting yarn 3 is withdrawn from the yarn package 4 and supplied to the knitting needle 7 in the knitting area among the many knitting needles 7 held by the needle bed 6 by the reciprocating motion of the yarn feeder 5.

The knitting needles 7 in the knitting area move forward and backward in synchronization with the reciprocating motion of the yarn feeder 5 by a needle driving device 8 of a cam type carriage driving system capable of reciprocating movement or a dedicated actuator driving system for each needle. A necessary loop is formed, the knitting yarn 3 is entangled with the loop, and the knitted fabric 9 is knitted.

The knitted fabric pull-down force control device 1 of the present invention lowers the knitted fabric 9 at a position below the knitting needles 7 so that a knitted fabric pull-down force corresponding to the number of loops at the time of knitting is provided for each course. 9 is added. In the case of this embodiment, a pair of rollers 10 and a pair of rollers 11 are provided in two upper and lower stages as elements for applying the pulling force to the knitted fabric 9, and one of them is connected to the motors 12 and 13, respectively. As a result, the motor is driven with a predetermined torque.

Next, FIG. 3 shows a specific configuration of the knitted fabric pull-down force control device 1 of the present invention. The knitted fabric pulling-down force control device 1 includes a calculating unit 14 as a main part. The calculation means 14 is connected on the input side to the knitting data output means 15, the pull-down force setting means 16, the distribution ratio setting means 17, and the increase / decrease ratio setting means 18, and on the output side, the pair of rollers 10, 11 Is connected to the pull-down force adjusting means 19 including The knitting data output means 15 is also connected to a knitting control device 20 for controlling the needle driving device 8.

The knitting data output means 15 stores knitting organization and knitting pattern data in advance, controls the knitting control device 20 based on the data, and in addition to the number of loops n and the loop length of one course. Alternatively, the correction parameter P for the consumed yarn length is output and sent to the calculating means 14.
Further, the pull-down force setting means 16 stores a reference pull-down force Fo per unit loop, for example, one loop, according to the structure of the knitted fabric 9, and always sends it to the calculating means 14. The reference lowering force Fo may be a value per a plurality of loops. Distribution ratio setting means 17
Is the distribution ratio K1 of the pulling-down force substantially acting on the pair of upper rollers 10 and the pair of lower rollers 11;
It is provided for setting K2. For example, when controlling the pull-down force applied to each of the rollers 10 and 11 at a ratio of 1: 2, K1 = 1 and K2 = 2 are set.

The increase / decrease ratio setting means 18 is provided to correct the content of the calculation based on the correction parameter P. That is, when knitting a knitted fabric in which the number of loops is the same but the loop length is changed in a specific course during knitting, the loop length correction parameter P is set in order to realize an optimal pulling-down force for the changed loop length. The content of the calculation is corrected based on. For example, in a course where the loop length is largely changed, the calculation content is corrected so that the pulling-down force is increased. Note that the loop length refers to a yarn length forming one loop, but a signal related to this loop length is sufficient as the correction parameter P. Instead of the loop length signal, for example, a loop length signal may be used. Since the size of the loop length eventually corresponds to the size of the consumed yarn length of each course, it may be replaced with, for example, the consumed yarn length per course. Therefore, the increase / decrease ratio setting unit 18 calculates the preset increase / decrease ratio X and the correction range values a and b by the calculation unit 1.
4 The increase / decrease ratio X is set as shown in the following table as an example according to the correction range values a and b.

[0012]

[Table 1]

For example, if the correction parameter P = 1 loop length, P = 15 [mm] is the knitting data output means 15
Is selected from Table 1, X = 0.8 is selected as the increase / decrease ratio X. Therefore, the content of the calculation is multiplied by the increase / decrease ratio X = 0.8 in accordance with the formula described later, and the control is performed with a smaller reduction force. Increase / decrease ratio X (X = 0.8, 1, 1.2) and correction range values a, b
(A = 20 [mm], b = 30 [mm]) are set in advance corresponding to each correction parameter P. Of course, the increase / decrease ratio X and the correction range values a and b may be subdivided into three or more divisions.

The calculating means 14 generates output signals of the pulling-down force F1 and the pulling-down force F2 by performing the calculation of the following equation, and outputs these signals to the comparison points 21 inside the pulling-down force adjusting means 19, Motor 1 through 22
The signals are sent to the driving circuits 23 and 24 corresponding to 2 and 13, respectively.

[0015]

(Equation 1)

These drive circuits 23 and 24 are adapted to drive the corresponding motors 1 in accordance with the output values of the pull-down forces F1 and F2, respectively.
Adjust the torque of 2 and 13 so that a pair of upper and lower rollers 1
The necessary rotational force is applied to 0 and 11, thereby exerting an appropriate pulling force on the knitted fabric 9. The driving circuit 2
The outputs of 3 and 24 are detected as current values by current detectors 25 and 26, respectively, and this current value is sent back to comparison points 21 and 22 as current feedback signals, respectively.

In the weft knitting process, the knitting control device 20 drives the carriage or the actuator of the needle driving device 8 based on the knitting data, and reciprocates the predetermined knitting needles 7 in the knitting area. The knitting yarn 3 supplied by the yarn feeder 5 is locked, a loop entangled with the knitting yarn 3 is formed, and the knitted fabric 9 is knitted.

In the knitting process, the knitting data output means 15 gives the number of loops n per one course and the correction parameter P to the calculating means 14. Therefore, the calculating means 14
Generates output signals corresponding to the pulling-down forces F1 and F2 for each of the pair of upper and lower rollers 10 and 11 by performing the calculation of the above-described formula, and outputs the corresponding drive circuits 23 and 24.
Input.

Therefore, each of the driving circuits 23, 24
Generates electric currents corresponding to the pulling-down forces F1 and F2, and drives the motors 12 and 13, so that the upper and lower rollers 1
A torque corresponding to the pull-down forces F1 and F2 is applied to 0 and 11, and a pull-down force corresponding to the number n of loops in one course is applied to the knitted fabric 9.

Therefore, in this knitting process, as shown in FIG. 4, a plurality of loops are formed for a certain knitting needle 7 in the knitting area for tack knitting, and the number of loops n changes in each course. Or as shown in FIG.
In order to reduce the number of stitches, the actual knitting needles 7 are reduced in each course, and even if a plurality of loops are formed for a small number of knitting needles 7, an appropriate pulling-down force is applied to the knitted fabric 9 in accordance with the number n of loops in one course. , The tension of the knitted fabric 9 does not decrease in the course, and uneven formation of loops and occurrence of knitting errors can be prevented beforehand.

[0021]

[Other Embodiments] In the above embodiment, the pull-down force adjusting means 19 is used.
Are provided with a pair of rollers 10 and 11 in two upper and lower stages as a pulling-down force applying element, but at least one pulling-down force applying element is sufficient. Of course, three or more may be provided. Therefore, when only one pulling-down force providing element is provided, the distribution ratio setting means 17 becomes unnecessary. In addition, the pulling-down force applying element may be configured such that the roller is divided in the longitudinal direction, and a different pulling-down force is applied to each divided portion. Further, instead of the motor 12 or 13, the torque of the motor is kept constant, and a torque transmission adjusting means such as a powder clutch is interposed between the motor and the force-lowering element to adjust the force of reduction. You can also. In the case of knitting knits having the same or substantially the same loop length, the output of the correction parameter P and the increase / decrease ratio setting means 18 can be omitted.

[0022]

According to the present invention, since the pulling-down force for the knitted fabric is set according to the number of loops for each course, the pulling-down force for the knitted fabric can be set to an appropriate state irrespective of the change in the knitting structure, that is, the knitting pattern. Therefore, the tension of the knitted fabric is not reduced, and the non-uniform loop formation and the knitting error can be prevented.

[Brief description of the drawings]

FIG. 1 is a side view of a main part of a knitted fabric pull-down force control device and a flat knitting machine to be controlled according to the present invention.

FIG. 2 is a side view of a main part of the flat knitting machine.

FIG. 3 is a block diagram of a knitted fabric pull-down force control device according to the present invention.

FIG. 4 is a plan view of the knitting structure of the tack.

FIG. 5 is a plan view of a knitted structure with stitches.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 knitted fabric pull-down force control device 2 weft knitting machine 3 knitting yarn 4 yarn package 5 yarn feeder 6 needle bed 7 knitting needle 8 needle drive device 9 knitted fabric 10 pair of rollers as pull-down force applying element 11 pair as pull-down force applying element Roller 12 Motor 13 Motor 14 Arithmetic means 15 Knitting data output means 16 Pull-down force setting means 17 Distribution ratio setting means 18 Increase / decrease ratio setting means 19 Pull-down force adjusting means 20 Knitting control device 21 Comparison point 22 Comparison point 23 Drive circuit 24 Drive Circuit 25 Current detector 26 Current detector

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) D04B 15/90 101 D04B 15/88 101

Claims (2)

(57) [Claims] 1. A knitting data output means for outputting the number of loops of one course as knitting data, a pull-down force setting means for setting a reference pull-down force per unit loop; Calculating means for generating an output signal of the pulling-down force for the knitted fabric with the pulling-down force as an input, and a pulling-down force adjusting means including a pulling-down force applying element for applying a pulling-down force to the knitted fabric according to the output signal of the calculating means. A knitted fabric pull-down force control device. 2. A knitting data output means for outputting the number of loops and a correction parameter for one course as knitting data, a pull-down force setting means for setting a reference reduction force per unit loop, and an increase / decrease corresponding to the correction parameter. Increase / decrease ratio setting means for setting the ratio; calculation means for generating an output signal of the reduction force by inputting the number of loops per one course, the correction parameter, the reference reduction force and the increase / decrease ratio, and an output signal of the calculation means A knitted fabric pull-down force control device, comprising: a pull-down force adjusting means that includes a pull-down force applying element that applies a pull-down force to a knitted fabric in response.