JPH0796743B2 - Knitting needle controller of knitting machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuator for operating a knitting needle of a knitting machine in which a large number of knitting needles are arranged on the outer circumference of a rotating cylinder and these knitting needles are operated by an actuator to form a knitting structure from a knitting yarn. The present invention relates to a knitting needle control device for driving.

[0002]

A knitting machine operates a knitting yarn by operating a large number of knitting needles to form a knitting structure. FIG. 5 is a system diagram including a partial model of a sock knitting machine including a conventional knitting needle control device. In FIG. 5, a plurality of yarn feeders 22 are provided in the vicinity of one end face of the cylinder 1 rotated by the motor M,
Around the cylinder 1, a large number of knitting needles 2 (2a, 2b-2n) having bats 3 (3a, 3b-3n) are arranged. These knitting needles 2 are moved up and down by moving the bat 3 up and down. Further, the bats of the adjacent knitting needles can be easily operated by changing their heights. And these bats are usually in groups of multiple heights, 4 in FIG.
It is divided into groups of individual height. Fingers 9 are provided for the bats of the same height group, and in this case, four fingers 9 are provided. Each of these fingers 9 is connected to the output shaft 8B of the actuator 8. The actuator 8 is of a magnetic holding type having a pole. When the SET drive current I is applied to the coil 8A, the output shaft 8B moves forward and stops, and the coil 8A is reset.
When the drive current I is passed, the output shaft 8B moves backward and stops. When the SET drive current I is passed through the coil 8A and the output shaft 8B is moved forward, the finger 9 connected to the output shaft 8B approaches the cylinder 1. When the cylinder 1 approaches the finger 9, the butt 3 of the knitting needle 2 which is rotating with the rotation of the cylinder 1 rides on the finger 9 and rises to move the knitting needle 2 in the upward direction, and further the rotation of the cylinder 1 causes the butt 3 to move to the finger. When separated from 9, the knitting needle 2 descends. Output the RESET drive current I through the coil 8A of the actuator 8
When 8B is moved backward, the finger 9 is separated from the cylinder 1 and the upward movement of the knitting needle 2 is stopped.

Independent knitting yarns 23 are supplied from the respective yarn feeders 22, and it is controlled whether or not the knitting yarns 23 are grabbed by the upward selective movement of the knitting needles 2 and the knitting yarns corresponding to a desired pattern picture are obtained. The yarn forms a knitting structure.

Reference numeral 20 denotes a knitting needle control device for driving an actuator 8 for knitting needle operation, which outputs a large number of pulse signals (hereinafter referred to as knitting needle speed pulse signal Q) proportional to the rotation speed of the cylinder 1, that is, the speed of the knitting needle 2. Rotation speed sensor 4
And the knitting needle speed pulse signal Q from this rotation speed sensor 4.
And a knitting needle operation signal P (which is normally input once and stored internally) and a control circuit 5 for outputting a knitting needle speed pulse signal Q drive signal R synchronized with the knitting needle speed pulse signal Q, The actuator drive signal R from the control circuit 5 is input to the coil 8A of the actuator 8 for SE.
Drive circuit 6 for outputting T or RESET drive current I
It consists of The drive circuit 6 is driven by a drive power source 10 whose output V is a constant voltage.

When the knitting needle operation signal P is input to the control circuit 5, an actuator drive signal R synchronized with the knitting needle speed pulse signal Q, that is, synchronized with the speed of the knitting needle 2, is output from this control circuit 5 and this actuator drive signal is output. R is input to the drive circuit 6, the drive circuit 6 outputs the SET or RESET drive current I to the coil 8A of the actuator, the output shaft 8B of the actuator 8 moves forward or backward, and the finger 9 approaches the cylinder 1. Or let go. The knitting needle 2 is operated via the finger 9 and the butt 3 by bringing the finger 9 close to or away from the cylinder 1 to form a knitting structure. In this case, the speed of the knitting needle 2 corresponds to the pattern picture and is controlled to be fast for a rough pattern picture and slow for a dense pattern picture to improve the knitting efficiency.

[0006]

The speed of the knitting needle changes depending on the pattern picture. Therefore, the operating time of the knitting needle depends on the speed of the knitting needle, and is short when the speed of the knitting needle is fast and long when it is slow. In the above-mentioned knitting machine, the knitting needle operation-like actuator is driven by a constant-voltage driving power source, and the knitting needle operating time is substantially constant regardless of the knitting needle speed. For this reason, it is the current situation that the knitting needle is operated in a short operation time corresponding to the portion where the speed of the knitting needle is the fastest with respect to the entire knitting structure. However, in order to shorten the operation time of the knitting needle, increase the drive voltage of the actuator,
It is necessary to increase the driving current, which causes a problem that the power consumption of the driving power source significantly increases.

In order to solve the above-mentioned problems, an object of the present invention is to change the operation time of the knitting needle in proportion to the speed of the knitting needle, that is, when the knitting needle speed is high, the operation time of the knitting needle is It is an object of the present invention to provide a knitting needle control device in which the operating time of a knitting needle is controlled to be short and long when the knitting needle is slow.

[0008]

In order to achieve the above object, the present invention arranges a large number of knitting needles on the outer circumference of a rotating cylinder, and operates these knitting needles by an actuator to form a knitting structure from a knitting yarn. A knitting needle control device in a knitting machine to form, a rotation sensor for outputting a knitting needle speed pulse signal of a pulse number proportional to the rotation speed of a cylinder, and a knitting needle operation signal separately given from the knitting needle speed pulse signal from this rotation sensor. A control circuit for outputting a drive signal of the actuator synchronized with the speed of the knitting needle, an actuator drive signal from the control circuit, and a drive voltage for outputting a drive voltage to the actuator; A drive power supply for supplying a drive voltage, wherein the drive power supply voltage control supplies a voltage proportional to the speed of the knitting needle. So that it provided the road.

[0009]

In the present invention, since the drive power supply control circuit for supplying a voltage proportional to the speed of the knitting needle to the drive power supply of the drive circuit is provided, the actuator for operating the knitting needle operates at a voltage proportional to the speed of the knitting needle and If the driving speed is fast, the driving voltage is high, and the driving current with a fast rise flows in the actuator coil, and the operating time of the knitting needle is short.If the knitting needle speed is slow, the driving voltage is low and the actuator coil is driven with a slow rising speed. The current flows and the operating time of the knitting needle is controlled to be long.

[0010]

1 is a system diagram including a partial model of a sock knitting machine equipped with a knitting needle controller according to an embodiment of the present invention. The difference from the knitting needle controller shown in FIG. The output V is driven by the variable-voltage drive power supply 10, and the output V of the drive power supply 10 is changed by the drive power supply voltage control circuit 11 to which the knitting needle speed pulse signal Q from the rotation sensor 4 is input.
The point is that the voltage is controlled in proportion to the speed of the knitting needle.

FIG. 2 is a drive power supply voltage control circuit in FIG.
11 is a block diagram of 11, a subtraction counter 15 to which a knitting needle speed pulse signal Q and a fixed-cycle clock pulse 17 from an oscillator 14 are input via a timer 19, an output 18 of the subtraction counter 15 and a knitting needle speed pulse signal Q. Is inputted and the output S thereof is composed of a D / A converter 12 inputted to the driving power source 10. Here, the pulse cycle T ₂ of the constant-cycle clock pulse 17 is extremely shorter than the assumed shortest cycle T ₁ of the knitting needle speed pulse signal Q, and T ₂ << T ₁ .

FIG. 3 shows a drive power supply voltage control circuit 11 shown in FIG.
In waveform diagram showing the operation in FIG. 3, for example, time t _a
At the rising edge of the knitting needle speed pulse signal Q [shown in FIG. 3 (1)], the count output signal 18 of the subtraction counter 15 [shown as E ₁ in FIG. 3 (3)] at that time is sent to the D / A converter 12. The voltage signal S is read and the voltage signal S [indicated by S ₁ in FIG. 3 (4)] corresponding to the value is output from the D / A converter 12. Also,
By the timer 19, the knitting needles speed pulse signal Q which predetermined very short time later than the time t _a is input to the subtraction counter 15, the subtraction counter 15 starts subtraction on the intended value X count is preset periodic clock pulse signal 17 [Fig. 3
(3) However, knitting needle speed pulse signal Q by timer 19
Since the delay of is a very short time, the subtraction counter 15 is as if preset at the time t _a ].
This subtraction is continued until the next pulse of the knitting needle speed pulse signal Q rises after the period T _{1, and} when the next pulse rises at the time t _b , the count output signal 18 of the subtraction counter 15 at that time is similarly to the above. [Shown as E ₂ in FIG. 3 (3)]
Is read by the D / A converter 12, and the D / A converter 12 outputs a voltage signal S [indicated by S ₂ in FIG. 3 (4)] corresponding to the value. Then, the knitting needle speed pulse signal Q delayed by a predetermined very short time is input to the subtraction counter 15 by the timer 19, and the subtraction counter 15 is preset to the desired value X count again and the subtraction is started [(3) in FIG. 3]. Show]. In this way, when the cycle T ₁ of the knitting needle speed pulse signal Q becomes shorter,
That is, when the speed of the knitting needle increases, the voltage signal S increases, and when the speed of the knitting needle decreases, the voltage signal S decreases. The output V of this voltage signal is input to the drive power source 10 of variable voltage, and the output V of the drive power source 10 is controlled to a voltage proportional to the voltage signal S, that is, proportional to the speed of the knitting needle.

FIG. 4 shows the movement of the actuator 8 for operating the knitting needle.
Show the production characteristics. Drive through coil 8A of actuator 8
Current value I of moving current I_iIs the voltage value of the output V of the driving power supply 10.
To V _i, The inductance of coil 8A is L, and the resistance value is R
Then, it is shown by the following equation (1).

[0014]

[Equation 1]

Here, the voltage value of the output V of the driving power source 10,
That is, changing the drive voltage value of the actuator 8.
Allows the rising speed of the drive current to be changed.
It In FIG. 4, the drive voltage value of the actuator 8 is V₁When
Drive current I₁And the driving voltage value is V₁Greater than
Ki V₂Drive current I₂And the transition of.
Here, the operating current of the actuator 8 is I₀Then,
Moving current I₁Or I ₂Is this operating current I₀Reached
The time until the actuator 8 operates is t₁Ah
Rui t₂And the drive voltage is V₁Operating time when
t₁Drive voltage value V₂Operating time t₂Is short
You can Here, the driving voltage value is an electric voltage proportional to the speed of the knitting needle.
When the knitting needle is operating when the knitting needle has a high pressure value
The time is short, and the operation time is long when the knitting needle speed is slow.
Be done.

[0016]

According to the present invention, the actuator for operating the knitting needle is driven by the voltage proportional to the speed of the knitting needle. Therefore, the conventional knitting needle is always driven by the constant voltage corresponding to the fastest condition. On the other hand, the power consumption of the driving power source is significantly reduced, the capacity of the driving power source can be reduced, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a system diagram including a partial model of a sock knitting machine including a knitting needle control device according to an embodiment of the present invention.

FIG. 2 is a block diagram of a drive power supply voltage control circuit of the knitting needle control device of the present invention shown in FIG.

3 is a waveform diagram showing the operation of the drive power supply voltage control circuit shown in FIG.

FIG. 4 is an operation characteristic diagram of a knitting needle operating actuator of the knitting needle control device of the present invention shown in FIG.

FIG. 5 is a system diagram including a partial model of a sock knitting machine including a conventional knitting needle control device.

[Explanation of symbols]

 1 Cylinder 2 Knitting needle 4 Rotation sensor 5 Control circuit 6 Driving circuit 8 Actuator (for knitting needle operation) 10 Driving power supply (for driving circuit 6) 11 Driving power supply voltage control circuit 20 Knitting needle control device P Knitting needle operation signal Q Knitting needle speed pulse signal R Actuator drive signal I Actuator drive current V Drive power supply 10 output (actuator drive voltage)

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hiroshi Matsuda 1-1 Tanabe Nitta, Kawasaki-ku, Kawasaki-shi, Kanagawa Fuji Electric Co., Ltd. (56) Reference JP-A-61-258054 (JP, A) JP 64-61542 (JP, A) JP-B 51-5105 (JP, B2)

Claims (1)

[Claims] 1. A knitting needle control device in a knitting machine, wherein a large number of knitting needles are arranged on the outer circumference of a rotating cylinder, and these knitting needles are operated by an actuator to form a knitting structure from a knitting yarn. A rotation sensor that outputs a knitting needle speed pulse signal having a pulse number proportional to, and a knitting needle speed pulse signal from the rotation sensor and a knitting needle operation signal that is separately provided are input, and a drive signal of the actuator that is synchronized with the speed of the knitting needle is input. A control circuit for outputting, a drive circuit for inputting an actuator drive signal from the control circuit to output a drive voltage to the actuator, and a drive power supply for supplying a drive voltage to the drive circuit, wherein A knitting needle control device for a knitting machine, comprising a drive power supply voltage control circuit that supplies a voltage proportional to speed.