JPH08127947A - Method for controlling knitting needle in knitting machine and apparatus therefor - Google Patents

Abstract

PURPOSE: To minimize unfavorable effects of knitting caused by an overshoot by controlling the needle speed at least just before the speed change point so as to keep the extent of the overshoot of the knitting needles constant. CONSTITUTION: The speeds of plural needles are set with a setter so as to keep the extent of overshoot for a knitting speed in a knitting machine of the type in which the plural needles are moved by a linear motor type needle motor. The optimal needle speed corresponding to the knitting speed is selected through a processing circuit to output a driving signal to a driver and the knitting needles are moved to promote the knitting. The extent of the overshoot is sensed during the knitting to compare the sensed value with the preset target value. The needle speeds at least just before the speed change point are controlled so that the compared value may be zero or a constant value or may be a tolerance of the extent of the overshoot when the compared value exceeds a prescribed value or the knitting speeds may be regulated in the case of a different needle movement pattern in one course by discriminating whether the needle movement pattern differs in the one course.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a device for controlling a knitting needle in a knitting machine, and more particularly to a method and a device for controlling a moving speed of a knitting needle which is reciprocally moved by a needle motor such as a linear motor.

[0002]

2. Description of the Related Art In a flat knitting machine, it is desired that each knitting needle be moved back and forth in a predetermined pattern. The reciprocating movement pattern of the knitting needle can be represented as a diagram with the movement amount of the knitting needle as the vertical axis and the time, the movement amount of the yarn feeder, or a combination of the two as the horizontal axis, as an example is shown in FIG. it can.

In the cam type flat knitting machine in which a knitting needle is moved by a cam, such a pattern is obtained by a cam diagram,
It is called a cam pattern or the like. However, the present invention relates to a knitting needle control method and device in a knitting machine of the type in which each knitting needle is moved by a needle motor such as a linear motor, and therefore the reciprocating movement pattern of the knitting needle is referred to as a "needle movement pattern".

In a so-called motor type flat knitting machine in which each knitting needle is moved by a needle motor such as a linear motor,
A phenomenon in which the knitting needle moves unnecessarily beyond the needle movement pattern at the shifting point of the needle movement, such as when the knitting needle changes from forward movement to backward movement and vice versa, or when the forward movement or backward movement is interrupted. (In the present invention, when the knitting needle moves unnecessarily across the needle movement pattern,
It is called "overshoot". ) Is difficult to avoid.

The amount of such overshoot (an example of the maximum value is shown by the symbol OV in FIG. 4) varies depending on the needle speed, knitting speed, etc., and even if the needle speed, knitting speed, etc. are constant, It often varies from course to course. In particular, in a knitting machine, it is unavoidable to change the knitting speed for the purpose of changing the yarn used, changing the knitting fabric structure, etc. However, when the knitting speed changes, the overshoot amount also changes accordingly. .

The change in the amount of overshoot causes various problems in knitting. In particular, as indicated by the broken line in FIG. 4, if overshoot occurs at the time of forming the stitches, the yarns are excessively pulled down, and the pulling amounts are uneven, so that the stitch lengths are uneven. Further, when the overshoot occurs, the knitting needle may collide with the yarn feeder or the knitting needle may not catch the yarn from the yarn feeder. Furthermore, when the amount of overshoot is large, abrasion or breakage of the knitting needle or needle bed becomes a problem.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to minimize the adverse effect of knitting due to overshoot.

[0008]

The present invention is applied to a method and apparatus for controlling the moving speed of a knitting needle in a knitting machine having a plurality of knitting needles, each of which is reciprocally moved by a needle motor such as a linear motor.

The control method of the present invention includes controlling at least the needle speed immediately before the gear shift point in order to keep the overshoot amount of the knitting needle constant.

The control device of the present invention comprises a driver for supplying electric power for driving the needle motor to the needle motor, a pattern setting device for setting knitting data, and a knitting needle based on the knitting data set by the setting device. And a processing circuit that supplies a driving signal to be moved to the driver. The processing circuit supplies the driver with a drive signal that makes the overshoot amount of the knitting needle constant at least at the needle speed immediately before the shift point.

According to the present invention, at least the needle speed immediately before the gear shift point is controlled, so that the overshoot amount of the knitting needle becomes substantially constant, and as a result, the adverse effect of knitting due to the overshoot is reduced.

In the control method of the present invention, the control of the needle speed can be easily executed by any of the following methods.

A1: A needle speed (for example, a needle movement pattern) at which the amount of overshoot is constant is set, and the knitting needle is moved according to the set needle speed.

A2: A plurality of needle speeds (for example, needle movement patterns) with which the overshoot amount with respect to the knitting speed (for example, yarn feeder movement speed) is constant are set, and an optimum needle speed is set in accordance with the knitting speed. select.

A3: The amount of overshoot is detected, the detected value is compared with the target value, and the needle speed (for example, the needle movement pattern) is changed so that the comparison value becomes zero or a constant value.

A4: When the above comparison value exceeds a predetermined amount, control is performed so that the overshoot amount becomes an allowable value.

A5: When the needle movement patterns are different in one course, the knitting speed (for example, the yarn feeder movement speed) is controlled so that the overshoot amount becomes a predetermined value.

In the control device of the present invention, the needle speed at which the overshoot amount becomes constant (for example, the needle movement pattern).
May be set in the setting device, and the processing circuit may output a drive signal for moving the knitting needle to the driver in accordance with the set needle speed.

In the controller of the present invention, a plurality of needle velocities (for example, needle movement patterns) with which the overshoot amount with respect to the knitting speed (for example, yarn feeder movement speed) is constant are set in the setting device, and the processing circuit is set. May select an optimum needle speed according to the knitting speed and output a drive signal corresponding to the selected needle speed to the driver.

The control device of the present invention further includes a detector for detecting the amount of overshoot, and a comparator for comparing the value detected by the detector with a target value.
The needle speed (for example, the needle movement pattern) may be changed so that the comparison value in the comparator becomes zero or a constant value, and the drive signal corresponding to the changed needle speed may be output to the driver. In this case, the processing circuit, when the comparison value exceeds a predetermined amount, so that the overshoot amount is within the allowable value,
The needle speed may be changed.

In the control device of the present invention, the processing circuit is
It may be determined whether or not the needle movement patterns are different during one course, and if they are different, the knitting speed may be controlled so that the overshoot amount is kept at a constant value.

In the control device of the present invention, the needle movement pattern is set in the setting device as the knitting data,
The processing circuit supplies the driver with a drive signal for moving the knitting needle at a speed corresponding to the set knitting data, and at least a drive signal corresponding to the needle speed immediately before the gear shift point so that the overshoot amount of the knitting needle is constant. The signal may be modified to a smaller or smaller signal and the modified signal may be supplied to the driver.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. 1, a controller 10 controls a knitting needle moving speed in a flat knitting machine having a plurality of knitting needles, each of which is reciprocated by a needle motor 12 such as a linear motor. Applied to.

The control device 10 includes a data input device, that is, a data setting device 14, a storage circuit 16 for temporarily storing knitting data set by the setting device, and a knitting needle based on the knitting data stored in the storage circuit. It includes a processing circuit 18 that outputs a drive signal for moving, and a driver 20 that supplies electric power for driving the needle motor to the needle motor 12 based on the drive signal supplied from the processing circuit.

The illustrated example only shows one needle motor 12 and one driver. However, in practice, since knitting machines usually have multiple knitting needles,
A plurality of needle motors 12 corresponding to one-to-one shapes for knitting needles
A plurality of drivers 20 are provided corresponding to the needle motor in a one-to-one shape.

The knitting data set in the setter 14 is a needle speed at which the overshoot amount becomes constant, for example, a needle movement pattern. The needle speed at which the amount of overshoot becomes constant is, for example, a trial operation according to the needle movement pattern shown by the solid lines in FIGS.
It is possible to create a needle movement pattern indicated by a dotted line in (A) and (B) and set the created needle movement pattern in the setter 14 as a needle movement pattern used for actual knitting.

In the example shown in FIG. 3 (A), the entire needle movement pattern is corrected, whereas in the example shown in FIG. 3 (B), the needle speed immediately before the stitch formation is corrected. Therefore, the modification of the needle movement pattern may be the entire needle movement pattern or a part of the needle movement pattern as long as it corrects the needle speed immediately before the shift point at which the knitting needle interrupts it from the forward movement at the latest. May be.

Other knitting data such as the knitting speed such as the moving speed of the yarn feeder, the kind of yarn, and the knitting structure may be set in the setter 14 together with the needle speed. The knitting data set in the setter 14 is temporarily stored in the storage circuit 16 by the processing circuit 18. However, when the data setter 14 has the same function as the random access memory, the data setter 14 may be used as a storage circuit.

During knitting, the processing circuit 18 reads the needle movement pattern from the storage circuit 16 and outputs a drive signal corresponding to the momentary needle speed determined by the read needle movement pattern to the knitting speed such as the movement speed of the yarn feeder. It is supplied to each driver 20 regardless of the knitting speed. Each driver 20 operates according to the drive signal supplied from the processing circuit 18, thereby moving the corresponding needle motor 12.

In the above embodiment, since the needle speed preliminarily corrected so that the overshoot amount is constant, for example, the needle movement pattern is used during the actual knitting, the overshoot amount of the knitting needle during knitting is substantially constant. As a result, the adverse effect of knitting due to overshoot is reduced.

When a needle movement pattern modified so that one reciprocating movement time changes, like the needle movement pattern shown in FIG. 3 (A), is set in the setter 14, the knitting speed of the yarn feeder and the like knitting are performed. It is also preferable to modify the speed. On the other hand, like the needle movement pattern shown in FIG. 3B, when a needle movement pattern corrected so that one reciprocating movement time does not change is set in the setting device 14, the movement speed of the yarn feeder, etc. The knitting speed does not have to be modified.

However, the knitting data set in the data setting device 14 may be data related to the knitting speed such as the moving speed of the yarn feeder, or data not related to the knitting speed. Good.

For example, in the embodiment of FIG. 1, a constant correction value at which the needle speed immediately before the shift point has a slope as shown by the dotted line in FIG. 3B is obtained by a trial operation or the like, and the obtained correction value is exceeded. It is also possible to input (or set) to the processing circuit 18 by the data setter 14 together with the needle movement pattern that does not consider the chute, and change the needle speed immediately before the shift point to the correction value in the processing circuit 18 at the time of actual knitting. Good.

In the embodiment of FIG. 1, the data setting unit 14 processes the needle speed at which the overshoot amount with respect to the knitting speed becomes constant, for example, the needle movement pattern.
Alternatively, the driving signal may be generated corresponding to the needle speed determined by the needle movement pattern input (or set) in the processing circuit 18.

Further, in the embodiment shown in FIG. 1, the processing circuit 18 determines whether the needle movement patterns are different in one course.
If it is determined that there is a difference, the knitting speed may be controlled in the processing circuit 18 to correct the actual needle speed.

Referring to FIG. 2, the control device 30 further includes a detector 32 for detecting a movement amount of the knitting needle by the needle motor 12, a target value setting device 34 for setting a target value of the movement amount of the knitting needle, The detector 36 compares the detected value of the detector 32 with the target value set in the setter 34, and outputs a signal corresponding to the difference, and the output signal of the comparator 36 is a signal corresponding to the needle speed, particularly Converted into a signal that can be used by the processing circuit 18,
And a signal conversion circuit that outputs the converted signal to the processing circuit 18.

The target value set in the target value setting unit 34 can be a target value of the actual movement amount of the knitting needle. Similar to the needle movement pattern, such a target value should be a pattern in which the vertical axis represents the target value of the actual movement amount of the knitting needle and the horizontal axis represents the time, the movement amount of the yarn feeder, or the knitting speed. You can

In the control device 30, a needle movement pattern corresponding to knitting data such as knitting speed, yarn type, knitting structure and the like is set in the data setting device 14. Further, the comparator 36 outputs a signal corresponding to the difference between the actual movement amount of the knitting needle and its target value to the signal conversion circuit 38, and the signal conversion circuit 38 processes the signal corresponding to the needle speed corresponding to the difference. Output to 18.

The processing circuit 18 corrects the needle speed, for example, the needle movement pattern, so that the signal supplied from the signal conversion circuit 38 becomes zero or a predetermined value, and outputs a drive signal corresponding to the corrected needle speed to the driver. Output to 20. As a result, even if the needle movement pattern set in the data setting device causes uneven overshoot, the overshoot amount during actual knitting becomes substantially constant.

In the embodiment of FIG. 2, the detector 32 may detect the overshoot itself. in this case,
When the target value of the overshoot is set in the target value setter 34 and an overshoot exceeding the set target value occurs, a signal corresponding to the exceeded amount is output from the comparator 36 via the signal conversion circuit 38. It is supplied to the processing circuit 18. As a result, the processing circuit 38 corrects the needle speed so that the overshoot amount is zero or within the allowable value,
The drive signal corresponding to the corrected needle speed is output to the driver 20. As a result, even if the needle movement pattern set in the data setting device causes uneven overshoot, the overshoot amount during actual knitting becomes substantially constant.

In any of the above embodiments, the needle speed may be corrected by correcting the needle movement pattern or the knitting speed itself.

[Brief description of drawings]

FIG. 1 is a block diagram of an electric circuit showing an embodiment of a control device of the present invention.

FIG. 2 is a block diagram of an electric circuit showing another embodiment of the control device of the present invention.

FIG. 3 is a diagram for explaining correction of a needle movement pattern.

FIG. 4 is a diagram for explaining overshoot.

[Explanation of symbols]

 10,30 Control device

Claims (13)

[Claims] 1. A method of controlling a knitting needle in a knitting machine including a plurality of knitting needles, each of which is reciprocally moved by a needle motor, wherein at least a needle speed immediately before a shift point is controlled so as to keep the overshoot amount of the knitting needle constant. A method of controlling a knitting needle in a knitting machine, comprising: 2. The needle speed at which the overshoot amount is constant is set, and the knitting needle is moved according to the set needle speed to control at least the needle speed immediately before the gear shift point. the method of. 3. A needle speed at least immediately before a gear change point is controlled by setting a plurality of needle speeds at which the overshoot amount with respect to the knitting speed is constant and selecting an optimum needle speed according to the knitting speed. The method according to claim 1. 4. An overshoot amount is detected, the detected value is compared with a target value, and the needle speed is controlled so that the comparison value becomes zero or a constant value, thereby controlling at least the needle speed immediately before the gear shift point. The method according to claim 1. 5. The needle speed is controlled at least immediately before the shift point by controlling the needle speed so that the overshoot amount becomes an allowable value when the comparison value exceeds a predetermined amount.
The method of claim 1. 6. The method according to claim 1, wherein it is determined whether or not the needle movement patterns are different during one course, and if they are different, the knitting speed is controlled to control at least the needle speed immediately before the shift point. The method described. 7. A knitting needle control device in a knitting machine having a plurality of knitting needles, each of which is reciprocally moved by a needle motor, wherein a knitting data and a driver for supplying electric power for driving the needle motor to the knitting needle are provided. A data setting device that is set, and a processing circuit that supplies a drive signal for moving the knitting needle to the driver based on the knitting data set by the setting device, wherein the processing circuit is at least the needle immediately before the shift point. A knitting needle control device in a knitting machine, wherein a speed supplies a drive signal to the driver so as to keep the overshoot amount of the knitting needle constant. 8. The needle speed at which the amount of overshoot is constant is set in the setting device, and the processing circuit outputs a drive signal for moving the knitting needle to the driver according to the set needle speed. The described device. 9. A plurality of needle velocities with which the overshoot amount with respect to the knitting speed is constant are set in the setting device, and the processing circuit selects an optimum needle velocity in accordance with the knitting velocity and sets the selected needle velocity to the selected needle velocity. The device according to claim 7, which outputs a corresponding drive signal to the driver. 10. A detector for detecting an overshoot amount, and a comparator for comparing a value detected by the detector with a target value, wherein the processing circuit has a comparison value in the comparator of zero or constant. The device according to claim 7, wherein the needle speed is changed to a value, and a drive signal corresponding to the changed needle speed is output to the driver. 11. The apparatus according to claim 10, wherein the processing circuit changes the needle speed such that when the comparison value exceeds a predetermined amount, the overshoot amount becomes the allowable value. 12. The processing circuit has a needle movement pattern of 1.
8. The device according to claim 7, wherein it is determined whether or not they are different during the course, and if they are different, at least the needle speed immediately before the gear shift point is controlled by controlling the knitting speed. 13. A needle movement pattern is set in the setting device as the knitting data, and the processing circuit is a circuit for supplying a drive signal for moving the knitting needles to the driver at a speed according to the set knitting data. The drive signal corresponding to the needle speed at least immediately before the shift point is corrected to a signal in which the overshoot amount of the knitting needle becomes constant or becomes small, and the corrected signal is supplied to the driver. apparatus.