JPH04370254A - Control device of knitting needle for knitting machine - Google Patents

Abstract

PURPOSE:To reduce electricity consumption of driving electric source by handling an actuator for operating a knitting needle by a voltage proportional to speed of knitting needle. CONSTITUTION:A driving electric source voltage control device 11 for supplying a voltage proportional to speed of a knitting needle 2 to a driving electric source 10 of a driving circuit 6 is laid. A handling time of the knitting needle is changed proportionally to speed of the knitting needle, the operation time of the knitting needle is controlled short in the case of high speed of the knitting needle and short in the case of low speed of the knitting needle. The capacity of the driving electric source is small.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to an actuator for operating the knitting needles of a knitting machine in which a large number of knitting needles are arranged on the outer periphery of a rotating cylinder, and these knitting needles are operated by an actuator to form a knitted structure from knitting yarn. The present invention relates to a knitting needle control device for driving.

0002

2. Description of the Related Art A knitting machine forms a knitted structure by manipulating knitting yarn by manipulating a large number of knitting needles. FIG. 5 is a system diagram including a partial model of a sock knitting machine equipped with a conventional knitting needle control device. In FIG. 5, a plurality of yarn feeders 22 are provided near one end surface of a cylinder 1 rotated by a motor M, and batts 3 (3a, 3b-3) are provided around the cylinder 1.
n) a large number of knitting needles 2 (2a, 2b-2n) with
is located. These knitting needles 2 are configured to move up and down by moving the butt 3 up and down. In addition, the butts of adjacent knitting needles have different heights to make it easier to operate. These bats are usually divided into groups of multiple heights, and in FIG. 5, groups of four heights. Each of these groups of bats of the same height is provided with a finger 9, in this case four fingers 9. These fingers 9 are each connected to an output shaft 8B of the actuator 8. The actuator 8 is a polarized magnetic holding type, and this coil 8A
When the SET drive current I is applied to the coil 8A, the output shaft 8B moves forward and stops, and when the RESET drive current I is applied to the coil 8A, the output shaft 8B moves backward and stops. coil 8A
When the SET drive current I is applied to 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 is rotating as the cylinder 1 rotates.
rides on this finger 9 and rises, moving the knitting needle 2 upward, and when the batt 3 comes off from the finger 9 due to further rotation of the cylinder 1, the knitting needle 2 descends. When the RESET drive current I is applied to the coil 8A of the actuator 8 to move the output shaft 8B backward, the finger 9 separates from the cylinder 1 and the upward movement of the knitting needle 2 is stopped.

[0003] The knitting yarns 2 are provided independently from each yarn feeder 22.
3 is supplied, and by selectively moving each knitting needle 2 upward, it is controlled whether or not to grab this knitting yarn 23, and a knitting structure is formed with the knitting yarn 23 corresponding to the desired pattern.

Reference numeral 20 denotes a knitting needle control device that drives an actuator 8 for operating knitting needles, and outputs a large number of pulse signals (hereinafter referred to as knitting needle speed pulse signals Q) proportional to the rotational speed of the cylinder 1, that is, the speed of the knitting needles 2. The rotational speed sensor 4, the knitting needle speed pulse signal Q from the rotational speed sensor 4, and the separately given knitting needle operation signal P (usually inputted once and stored internally) are inputted into the knitting needle speed pulse signal Q. A control circuit 5 that outputs a synchronized knitting needle speed pulse signal Q drive signal R, and a drive circuit 6 that receives the actuator drive signal R from the control circuit 5 and outputs a SET or RESET drive current I to the coil 8A of the actuator 8. It has become. The drive circuit 6 has its output V
is driven by a constant voltage drive power supply 10.

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 the control circuit 5, and this actuator drive signal R is input to the drive circuit 6, and the drive circuit 6 outputs the SET or RESET drive current I to the coil 8A of the actuator, and the output shaft 8B of the actuator 8 moves forward or backward to bring the finger 9 closer to the cylinder 1. Or let go. By moving the fingers 9 closer to or away from the cylinder 1, the knitting needles 2 are operated via the fingers 9 and the butt 3 to form a knitted structure. In this case, knitting needle 2
The speed corresponds to the pattern, and is controlled to be faster for coarse patterns and slower for dense patterns to improve knitting efficiency.

[0006]

[Problem to be Solved by the Invention] The speed of the knitting needles changes depending on the pattern. Therefore, the operation time of the knitting needles depends on the speed of the knitting needles, and when the speed of the knitting needles is fast, it is short, and when the speed of the knitting needles is slow, it is long. However, in the above-mentioned knitting machine, the actuator for operating the knitting needles is driven by a constant voltage drive power source, and the operating time of the knitting needles is almost constant regardless of the speed of the knitting needles. For this reason, the current situation is that the entire knitting structure is operated with a short operation time corresponding to the location where the speed of the knitting needles is fastest. However, in order to shorten the operation time of the knitting needles, the driving voltage of the actuator must be increased.
There is a problem in that it is necessary to increase the drive current, and the power consumption of the drive power source increases significantly.

An object of the present invention is to solve the above-mentioned problems by making it possible to change the operation time of the knitting needles in proportion to the speed of the knitting needles. That is, when the speed of the knitting needles is fast, the operation time of the knitting needles is changed in proportion to the speed of the knitting needles. It is an object of the present invention to provide a knitting needle control device that controls the operation time of the knitting needle to be long when the knitting needle is short and the speed of the knitting needle is slow.

[0008]

[Means for Solving the Problems] In order to achieve the above object, the present invention arranges a large number of knitting needles on the outer periphery of a rotating cylinder, and operates these knitting needles with an actuator to form a knitting structure from knitting yarn. The knitting needle control device in the knitting machine for forming the knitting machine includes a rotation sensor that outputs a knitting needle speed pulse signal with a pulse number proportional to the rotational speed of the cylinder, a knitting needle speed pulse signal from the rotation sensor, and a separately given knitting needle operation signal. a control circuit that receives the input signal and outputs a drive signal for the actuator synchronized with the speed of the knitting needle; a drive circuit that receives the actuator drive signal from this control circuit and outputs a drive voltage to the actuator; A drive power source that supplies a drive voltage is provided, and a drive power source voltage control circuit that supplies a voltage proportional to the speed of the knitting needles is provided.

[0009]

[Function] In the present invention, a drive power supply control circuit that supplies a voltage proportional to the speed of the knitting needles is provided to the drive power supply of the drive circuit, so that the actuator for operating the knitting needles can control the speed of the knitting needles with a voltage proportional to the speed of the knitting needles. If the knitting needle speed is slow, the drive voltage is high, and a drive current with a fast rise flows through the actuator coil, shortening the operating time of the knitting needles.If the knitting needle speed is slow, the drive voltage is low, and a drive current with a slow rise flows through the actuator coil. The current flows and the operating time of the knitting needles is controlled to be long.

0010

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

FIG. 2 is a block diagram of the drive power supply voltage control circuit 11 in FIG. , and a D/A converter 12 to which the output 18 of the subtraction counter 15 and the knitting needle speed pulse signal Q are input, and the output S thereof is input to the drive power supply 10. Here, periodic clock pulse 1
The pulse period T2 of No. 7 is very short compared to the assumed shortest period T1 of the knitting needle speed pulse signal Q, and T2<<T
1.

FIG. 3 shows the drive power supply voltage control circuit 1 shown in FIG.
1. In FIG. 3, for example, at time t
The rise of the knitting needle speed pulse signal Q at a [Figure 3 (
1)], the count output signal 18 of the subtraction counter 15 at that time [shown as E1 in Fig. 3 (3)]
is read into the D/A converter 12, and the D/A converter 12 outputs a voltage signal S corresponding to that value [S1 in (4) in FIG.
] is output. In addition, the timer 19 generates a knitting needle speed pulse signal Q that is delayed by a predetermined extremely short time from time ta.
is input to the subtraction counter 15, the subtraction counter 15 is preset to the desired value X count, and subtraction is started by the fixed period clock pulse signal 17 [as shown in FIG. Because the delay in
a]. This subtraction continues until the next pulse of the knitting needle speed pulse signal Q rises after the period T1, and when the next pulse at time tb rises, the count output signal 18 of the subtraction counter 15 at that point is shown as in the same way as described above. 3 (3) shown as E2] is read into the D/A converter 12, and the
A voltage signal S corresponding to the value is output from the A converter 12 [Fig. 3 (
4) Indicated by S2] is output. and timer 1
9, the knitting needle speed pulse signal Q is delayed for a predetermined extremely short time.
is input to the subtraction counter 15, the subtraction counter 15 is again preset to the desired value X count, and subtraction is started [as shown in FIG. 3(3)]. In this way, when the period T1 of the knitting needle speed pulse signal Q becomes shorter, that is, when the speed of the knitting needles becomes faster, the voltage signal S becomes higher, and when the speed of the knitting needles becomes slower, the voltage signal S becomes lower. The output V of this voltage signal is input to the variable voltage drive power supply 10, and the drive power supply 1
The zero output V is controlled to a voltage proportional to this voltage signal S, that is, proportional to the speed of the knitting needles.

FIG. 4 shows the operating characteristics of the actuator 8 for operating knitting needles. The current value Ii of the drive current I flowing through the coil 8A of the actuator 8 is determined by the voltage value of the output V of the drive power source 10 being Vi, the inductance of the coil 8A being L,
Letting the resistance value be R, it is expressed by the following equation (1).

[0014]

[Math 1]

Here, the voltage value of the output V of the drive power supply 10,
That is, by changing the drive voltage value of the actuator 8, the rise speed of the drive current can be changed. FIG. 4 shows the transition of the drive current I1 when the drive voltage value of the actuator 8 is V1, and the transition of the drive current I2 when the drive voltage value is V2, which is even larger than V1. Here, if the operating current of the actuator 8 is I0, then
The time it takes for the drive current I1 or I2 to reach the operating current I0 and the actuator 8 to operate is t1 or t2, respectively, and the operating time t2 when the drive voltage value is V2 is longer than the operating time t1 when the drive voltage value is V1. can be controlled briefly. Here, the drive voltage value is a voltage value proportional to the speed of the knitting needles, and when the speed of the knitting needles is fast, the operation time of the knitting needles is short, and when the speed of the knitting needles is slow, the operation time is controlled to be long.

[0016]

[Effects of the Invention] In the present invention, the actuator for operating the knitting needles is driven with a voltage proportional to the speed of the knitting needles. In contrast, the power consumption of the drive power source is significantly reduced, and the capacity of the drive power source can also be reduced, resulting in lower costs.

[Brief explanation of drawings]

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

[Fig. 2] A block diagram of a drive power supply voltage control circuit of the knitting needle control device of the present invention shown in Fig. 1.

[Figure 3] Waveform diagram showing the operation of the drive power supply voltage control circuit shown in Figure 2

[Fig. 4] Operation characteristic diagram of the knitting needle operating actuator of the knitting needle control device of the present invention shown in Fig. 1.

[Fig. 5] System diagram including some models of sock knitting machines equipped with conventional knitting needle control devices

[Explanation of symbols]

1 Cylinder 2 Knitting needle 4 Rotation sensor 5 Control circuit 6 Drive circuit 8 Actuator (for knitting needle operation) 10
Drive power supply (of drive circuit 6) 11 Drive 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

Claims (1)

[Claims] 1. A knitting needle control device for a knitting machine in which a large number of knitting needles are arranged on the outer periphery of a rotating cylinder, and the knitting needles are operated by an actuator to form a knitting structure from knitting yarn, the knitting needle control device comprising: a rotating speed of the cylinder; a rotation sensor that outputs a knitting needle speed pulse signal with a pulse number proportional to , and a knitting needle speed pulse signal from this rotation sensor and a separately given knitting needle operation signal are inputted to generate a drive signal for the actuator synchronized with the speed of the knitting needle. A control circuit for outputting a knitting needle, a drive circuit for receiving an actuator drive signal from the control circuit and outputting a drive voltage to the actuator, and a drive power source for supplying the drive voltage to the drive circuit. A knitting needle control device for a knitting machine, comprising a drive power supply voltage control circuit that supplies a voltage proportional to speed.