JPH06264342A - Knit fabric control unit - Google Patents

Abstract

PURPOSE:To obtain flat knit fabric uniform in density and having proper degree of stitches by controlling knit fabric unwinding so that consumed yarn length or yarn feed tension coincide with a preset target value. CONSTITUTION:In a flat knitting machine, knitting yarn 3 delivered from a yarn package 4 is fed, via a feed yarn tension regulator 10, a yarn length detector 12, a feed yarn tension detector 15, through a feed yarn port 5, to many knitting needles 7 held on a knitting bed 6 to weave knit fabric 9 along with unwinding the fabric by a pair of rollers 11 connected to an unwinding motor 13. During the above weaving operation, a target value per unit course set in a yarn length setter is compared with the consumed yarn length detected by the yarn length detector 12 and a motor 13 is controlled so that both the values coincide with each other to regulate knit fabric unwinding. And, degree of stitches for the knitted fabric is controlled by regulating needle retraction so that a target feed yarn tension set in a feed yarn tension setter coincide with the value from the feed yarn tension detector 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for realizing a proper knitting density, that is, a proper stitch in a flat knitting machine.

[0002]

2. Description of the Related Art As a device corresponding to a first embodiment described later,
There is JP-A-59-106548. The publication
It is disclosed that the stitch length is changed so that the yarn length is constant. According to the above technique, since the knitting cam is controlled, the mechanical structure is complicated, and since the amount of withdrawal of the needle for forming the stitches is controlled, the yarn that has been pulled in depends on the amount of withdrawal. There is excess or deficiency in the friction with the needle bed, and it is not possible to knit a product with uniform stitches.

As a device corresponding to the second embodiment described later, there is Japanese Patent Publication No. 43-16918. This publication discloses controlling the yarn feeding tension controller so that the detected yarn feeding tension matches the target tension. According to the above technique, even if the tension of the yarn feeding is constant, friction at the sinker portion,
It is difficult to make the yarn tension constant at the position where the yarn feeder and the needle are engaged, because the variation of the pulling down force of the fabric, the variation of the physical properties of the yarn, the variation of the humidity and the like affect. Therefore, an appropriate degree cannot be achieved by only a single control of constant yarn feeding tension.

The above-mentioned Japanese Patent Laid-Open No. 59-106548 also corresponds to Example 2 described later. The publication discloses controlling the amount of drawing of the needle for stitch stitch formation so that the detected yarn length matches the target yarn length. This technique also does not consider the yarn feeding tension, so that there is the following problem depending on the magnitude of the yarn feeding tension.

When the yarn feeding tension is large, the detected yarn length becomes short, so the amount of pulling in of the needle is greatly changed. As a result of the change, the yarn feeding tension is further increased and the yarn contracts after knitting, The proper degree cannot be achieved. On the contrary, when the yarn feeding tension is small, the detected yarn length becomes long, so
Although the amount of pull-in of the needle is changed to a smaller value, as a result, the yarn feeding tension becomes smaller, and the contraction of the yarn after knitting becomes relatively small, so that it is impossible to realize a proper stitch.

Further, according to the conventional general technique corresponding to the third embodiment described later, the yarn feeding tension is detected, and the yarn feeding path is adjusted so that the detected yarn feeding tension matches the target yarn feeding tension. The tension controller provided therein is controlled, but in this case, a special tension controller is required, and the structure of the special tension controller is complicated.

[0007]

OBJECTS OF THE INVENTION It is an object of the present invention to compensate for the shortcomings of the prior art by controlling adjustment targets other than the stitches in order to achieve the proper stitches.

[0008]

SUMMARY OF THE INVENTION In order to achieve an appropriate stitch, the present invention controls the winding amount of knitted fabric so that the consumed yarn length is constant or realizes an appropriate stitch. In order to achieve this, the above object is achieved by controlling the winding amount of the knitted fabric so that the yarn feeding tension becomes constant.

[0009]

[Structure of Flat Knitting Machine] FIGS. 1 and 2 show a mechanical portion of a flat knitting machine 2 in a portion related to a knitted fabric control device 1 of the present invention. The knitting yarn 3 is pulled out from the yarn package 4, passes through a yarn feeding tension adjuster 10, a yarn length detector 12, a side tension device 14, and a yarn feeding tension detector 15,
It has reached the yarn feeder 5. By repeating the reciprocating motion, the yarn feeder 5 supplies the knitting yarn 3 to the knitting needles 7 in the knitting region among the many knitting needles 7 held by the needle bed 6.

The knitting needles 7 in the knitting region are synchronized with the reciprocating motion of the yarn feeder 5 and can be reciprocally moved by a cam type carriage drive system or a dedicated actuator (linear motor) for each needle.
The needle drive device 8 of the drive system is moved forward and backward to form a loop of the knitting yarn 3, and the knitting yarn 3 is newly entangled in this loop to knit the knitted fabric 9. And knitted fabric 9
Is sandwiched by a pair of lower rollers 11 and is pulled down with a predetermined tension by controlling the rotation amount thereof. One of the pair of rollers 11 is connected to a winding motor 13 so that it can be driven with a predetermined torque.

[0011]

[Embodiment 1] FIG. 3 shows the construction of a knitted fabric control apparatus 1 of Embodiment 1. The knitting fabric control device 1 includes a yarn length detector 12 that detects a yarn length Lx consumed per unit length (unit course) length, a yarn length setter 16 that sets a target yarn length Lo, and a yarn length. Comparison unit 1 for comparing Lx with the target yarn length Lo
7. A controller 18 for controlling the rotation amount of the winding-down motor 13 as the winding-down amount adjusting means based on the deviation ΔL of the comparison unit 17.

The yarn length detector 12 per unit length is shown in FIG.
As shown in, for example, the length measuring roller 31, the encoder 3
2, a counter 19, and a position detector 20. The counter 19 is provided with position detectors 20 a, 2 for the yarn feeder 5.
The yarn length Lx per one course is detected by being set at the one corresponding to the right end of the knitting area of 0b, starting the counting operation, and stopping the counting operation at the one corresponding to the left end. Send in.

The yarn length Lx consumed is detected during the knitting operation of the flat knitting machine 2, and this is compared with the target yarn length Lo.
It is compared in 7 and sent to the controller 18 as a deviation ΔL. Here, the controller 18 adjusts the amount of rotation of the winding motor 13 as a control target so that the detected yarn length Lx matches the target yarn length Lo, and controls the amount of pulling down the knitted fabric 9. To do.

In the process of controlling the reduction amount, a in FIG.
As seen in b, immediately after the loop of the previous knitting yarn 3 hanging on the knitting needle 7 is disengaged from the knitting needle 7 and engaged with the new loop drawn this time, the unwinding force by the previous loop is Therefore, the adjustment of the unwinding force at this time determines the size of the loop this time. Therefore, by this, the density of the knitted fabric 9, that is, the stitch size, is indirectly adjusted by the pulling down amount of the knitted fabric 9.

According to this control, a complicated mechanism is not required as compared with the conventional system for controlling the knitting cam, which is advantageous in this respect. Further, the stitch control is constant as before, and the stitch is controlled as a result by controlling the winding amount. Therefore, the state in which the knitting needle 7 is pulled in to create the stitch can always be kept constant. it can. Therefore, the knitting needle 7 and the needle bed 6 at this time are
The friction with and can be made constant, and a uniform product can be knitted.

[0016]

[Embodiment 2] FIG. 6 shows the structure of a knitted fabric control device 1 according to a second embodiment. The second embodiment is an example in which the yarn feeding tension Tx is controlled at the same time as the control of the winding amount or the needle drawing amount of the knitted fabric 9. As in the first embodiment, the controller 18 controls the motor 13 for lowering or by controlling the needle adjuster 81 inside the needle drive device 8 to adjust the needle withdrawal amount. , The control is controlled so as to match the target control. The needle adjuster 81 adjusts the amount of advance / retreat of the linear motor in the case of adjusting the knitting cam as in JP-A-59-106548 or in the case of a dedicated actuator (linear motor) drive type needle drive device. It does not matter what you do.

In parallel with this, the yarn feeding tension Tx is controlled. That is, the yarn feeding tension detector 15 detects the yarn feeding tension T
x is detected, and this yarn feeding tension Tx is
Is compared with the target tension To from the tension setter 22,
The tension deviation ΔT is input to the controller 23. Here, the controller 23 adjusts the yarn feeding tension adjuster 10 to change the yarn feeding tension Tx to match the yarn feeding tension Tx with a target value. According to this embodiment, since the yarn feeding tension Tx is kept constant and the stitch length is changed and controlled according to the consumed yarn length Lx, an appropriate stitch can be realized.

[0018]

Third Embodiment FIG. 7 shows the third embodiment. The knitted fabric control device 1 according to the third embodiment includes a yarn feeding tension detector 1
5, a tension setter 24, a comparison unit 25 between the yarn feeding tension Tx and the target tension To, and a controller 26 that controls the winding-down motor 13 based on the deviation ΔT of the comparison unit 25.

This embodiment is an example in which the winding down amount is controlled so that the yarn feeding tension Tx is constant in order to realize an appropriate stitch. The comparison unit 25 compares the yarn feeding tension Tx with the target tension To, generates a deviation ΔT, and sends the deviation ΔT to the controller 26. Here, the controller 26 applies a predetermined unwinding force to the knitted fabric 9 by controlling the rotation amount of the motor 13 as the unwinding amount adjusting means based on the deviation ΔT.

Since the previous loop of the knitting yarn 3 applied to the knitting needle 7 is disengaged from the knitting needle 7 and immediately after the new loop-up engagement which is drawn in this time is performed, the unwinding force by the previous loop acts on this loop. The yarn feeding tension Tx can be adjusted by increasing or decreasing the lowering force. By properly adjusting the yarn feeding tension Tx, it is possible to realize a proper stitch.

[0021]

According to the present invention, in order to realize a proper stitch, the winding amount is controlled so that the consumption yarn length is constant, or the yarn feeding tension is constant. Since the amount of winding down is controlled, compared to the conventional one,
The braided density can be made more uniform.

[Brief description of drawings]

FIG. 1 is a schematic front view of a flat knitting machine.

FIG. 2 is a schematic side view of a flat knitting machine.

FIG. 3 is a block diagram of the knitted fabric control device according to the first embodiment.

FIG. 4 is a block diagram of a yarn length detector per unit length.

FIG. 5 is an explanatory diagram of a knitting needle operation.

FIG. 6 is a block diagram of a knitted fabric control device according to a second embodiment.

FIG. 7 is a block diagram of a knitted fabric control device according to a third embodiment.

[Explanation of symbols]

 1 Knitting fabric control device 2 Flat knitting machine 3 Knitting yarn 4 Thread package 5 Thread feeder 6 Needle bed 7 Knitting needle 8 Needle driving device 9 Knitting fabric 10 Yarn feeding tension adjuster 11 Roller 12 Yarn length detector 13 Motor 14 Side tension device 15 Feeding Thread tension detector 16 Thread length setter 17 Comparison section 18 Controller 19 Counter 20a Position detector 20b Position detector 21 Comparison section 22 Tension setter 23 Controller 24 Tension setter 25 Comparison section 26 Controller

Claims (3)

[Claims] 1. In a flat knitting machine, a yarn length detector for detecting a yarn length consumed per unit course length, a yarn length setter for setting a target yarn length, and a detected yarn length for a target yarn length. A knitted fabric control device, comprising: a controller that controls a winding amount of the knitted fabric so as to match the length. 2. A yarn feeding tension detector for detecting a yarn feeding tension,
The yarn feeding tension setting device that sets the target yarn feeding tension, the yarn feeding tension adjusting device that adjusts the yarn feeding tension, and the yarn feeding tension adjusting device so that the detected yarn feeding tension matches the target yarn feeding tension. The controller for controlling the thread length, the thread length detector for detecting the thread length consumed per unit course length, the thread length setter for setting the target thread length, and the needle withdrawal amount for forming stitches. Adjusting needle adjuster or winding down adjuster for adjusting the winding down amount of the knitted fabric, and control for controlling the needle adjuster or winding down adjuster so that the detected yarn length matches the target yarn length. And a knitting fabric control device. 3. A yarn feeding tension detector for detecting the tension of the yarn feeding, a yarn feeding tension setting device for setting a target yarn feeding tension, and the detected yarn feeding tension so as to match the target yarn feeding tension. And a controller for controlling the amount of winding of the knitted fabric.