JP2014095157A - Method and apparatus for take-up control in circular knitting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and apparatus for take-up control in a circular knitting machine, which can automatically take up a knitted fabric with appropriate and stable take-up tension in a position control mode even when the production quantity of the knitted fabric is significantly changed during operation.SOLUTION: In a circular knitting machine, a tubular knitted fabric produced in a knitting section according to set knitting conditions is taken up by a take-up mechanism section including a take-up servomotor 5, and the take-up mechanism section is controlled by a take-up control section 6. The take-up control section 6 changes production quantity data in response to a change in specific knitting data having an effect on the production quantity of the knitted fabric during operation, among the knitting conditions, in a position control mode for performing control so that a take-up quantity according to position control data is taken up. In addition, the position control data corresponding to the take-up quantity of the knitted fabric is set so as to change in synchronization with the change in the production quantity data.

Description

  The present invention relates to a winding control method and apparatus for winding a tubular knitted fabric produced by a circular knitting machine having an electronic needle selection function.

  In general, a circular knitting machine is produced by a knitting unit that produces a cylindrical knitted fabric by rotating a cylinder containing a knitting needle in a needle groove by driving a motor and supplying yarn to the knitting needle, and the knitting unit. A winding mechanism for winding the tubular knitted fabric. In this winding mechanism section, a servo motor capable of precise and high-speed control is often used to drive the winding roller, and command pulses synchronized with the operation of the knitting section are given to the servo driver to give the knitted fabric. Control to wind up. In this case, a torque control mode for controlling the output torque of the servo motor to be constant and a position control mode for controlling the rotation angle of the servo motor to be constant are often used.

  In a circular knitting machine with an electronic needle selection function, during operation, the knitted fabric is rotated with respect to one rotation of the cylinder of the knitting part due to changes in the knitting conditions such as the knitting structure, stitch amount, knitting timing, yarn used, etc. Production volume may change during operation. For example, the production amount of an all-knit knitted fabric is larger than that of a knitted fabric using welts or tacks, and the larger the stitch amount, the larger the production amount. It is known to use the above-described torque control mode in order to cope with this change in production volume (for example, Patent Document 1). By making the output torque of the torque (servo) motor constant, automatic torque adjustment is performed by controlling the torque motor so as to maintain a constant winding tension even if the knitted fabric production amount changes.

  By the way, in the use of the torque control mode that maintains a constant winding tension, depending on the knitting conditions such as the yarn used and the knitting structure, it is produced when the operation is stopped due to the influence of the winding tension and the properties of the yarn used. The knitted fabric has a problem that a stop step, which is a knitting defect with a line-like step around the cylindrical knitted fabric, and a transverse step, which is a knitting defect with a spiral step during operation, are likely to occur. .

  On the other hand, unlike the torque control mode, the position control mode can wind up a set amount of knitted fabric, so that it is possible to wind up a stable knitted fabric with few stops and lateral steps. In the position control mode, the knitted fabric production amount that is the rotation angle of the servo motor per one rotation of the cylinder of the knitting unit, that is, the movement amount data per one pulse of the command pulse number to the servo motor is manually set in advance. In this mode, the knitted fabric is wound at a constant winding tension by giving this as position control data to the servo motor driver. By setting one position control data in the control operation unit, the knitted fabric amount is always taken up according to the position control data during operation.

Japanese Patent No. 2733760 JP 2010-285700 A

  However, if the position control mode is used as it is, it may be possible to cope with a slight change in the production amount of the knitted fabric, but it is in operation due to a change in the knitting structure due to the electronic needle selection function, such as garment length knitting. When the production amount of the knitted fabric changes greatly, the allowable range that can be accommodated by adjusting the winding amount may be exceeded. In this case, the winding tension of the knitted fabric becomes extremely weak or strong, the quality of the knitted fabric is adversely affected by knitting flaws, or the operation cannot be continued due to yarn breakage or a yarn feeder alarm, Appropriate and stable knitted fabrics may not be produced and may not be wound up. In order to prevent this, it is necessary to stop and reset the operation in response to a large change in the production amount of the knitted fabric, which leads to a decrease in production efficiency.

  Further, as a method of using the position control mode while responding to changes in the production amount of the knitted fabric, the winding of the knitted fabric is started in the torque control mode, and after the winding state in the torque control mode is stabilized, the position control mode is used. It is known that the knitted fabric is automatically wound up (for example, Patent Document 2), but this method is used to shift the mode at the start of operation, and the production volume during operation is large. It cannot respond to changes.

  The present invention relates to a winding control method for a circular knitting machine capable of winding a knitted fabric with an appropriate and stable winding tension in a position control mode even when the production amount of the knitted fabric changes greatly during operation. And to provide an apparatus.

  In order to achieve the above object, a winding control method and apparatus for a circular knitting machine according to an embodiment of the present invention includes a winding mechanism and a winding mechanism including a winding servomotor for driving a roller. The cylindrical knitted fabric produced by the knitting unit is wound based on the set knitting conditions, and the winding mechanism unit is controlled by the winding control unit. Specific knitting data that influences the production amount of the knitted fabric during operation among the knitting conditions under a position control mode in which the winding control unit controls the winding amount according to the position control data. The production amount data is changed in response to the change in position, and the position control data corresponding to the winding amount of the knitted fabric is set to change synchronously with the change in the production amount data.

  According to this configuration, under the position control mode, among the knitting data related to the knitting conditions, the production amount data is changed in response to a change in the specific knitting data that affects the production amount of the knitted fabric during operation. Since the control is performed so that the position control data corresponding to the winding amount of the knitted fabric is changed in synchronization with the change of the production amount data, the change in the production amount of the knitted fabric is large. However, under the position control mode, the production amount data can be changed from the change of the specific knitting data, and this can be synchronized with the position control data, so that the production amount of the knitted fabric and the winding amount can be matched. The knitted fabric can be wound with an appropriate and stable winding tension.

  Preferably, the specific knitting data includes at least one of knitting structure data, stitch amount data, knitting timing data, and used yarn data, and a change in position control data corresponding to the change in the specific knitting data is detected. By storing in advance and synchronizing the change in the production data and the change in the position control data, the changed position control data is set based on the change in the specific knitting data. Therefore, quick response is possible, and more appropriate and stable winding of the knitted fabric is possible.

  The specific knitting data is set for one course of the knitting structure, that is, for each row of the knitting structure in the horizontal direction. Therefore, it is possible to wind up the knitted fabric which is appropriate and stable for each course against changes in the production amount of the knitted fabric.

  Preferably, a change in the knitting operation data corresponding to the change in the specific knitting data among the knitting conditions is stored in advance, and the knitting operation data and the predetermined data corresponding to the production amount data are collated and matched. The production amount data is obtained from the predetermined data, and the production amount data is changed by repeating this, and the position control data is set to change in synchronization with the change of the production amount data. Here, the predetermined data is a pair with the knitting operation data and refers to data set in advance as data to be collated with the knitting operation data. Therefore, by replacing the correspondence between the change in the production volume data and the change in the position control data with the collation of the knitting operation data and the default data, the configuration of the existing apparatus that does not have the specification capable of setting the production volume data can be obtained. By using it as it is, the production amount and the winding amount of the knitted fabric can be matched.

  Preferably, the knitting operation data is rotation speed data of the knitting unit. Therefore, the position control data can be set more easily with respect to the change of the specific knitting data.

  Preferably, the rotational speed data and the predetermined data are collated for each course of the knitting structure, and if the rotational speed data does not change, acquisition of the production amount data corresponding to the matching predetermined data and the production amount data; Without synchronizing the position control data, the settings of the production volume data and the position control data are held as they are, and the next course is verified. In addition, four types of the predetermined data are set, the first data is the default data for the inching speed, the second data is the default data at a lower speed than the first data, and the third data is the medium speed higher than the first data. The predetermined data and the fourth data are high-speed predetermined data that is faster than the third data. Therefore, the position control data can be set more easily with respect to the change of the specific knitting data.

  In the present invention, even when the production amount of the knitted fabric greatly changes due to a change in the specific knitting data during operation, the knitting is performed in the position control mode with little influence on the knitted fabric quality without stopping the operation of the apparatus. The ground can be wound with an appropriate and stable winding tension.

1 is an overall front view of a circular knitting machine according to an embodiment of the present invention. It is a block diagram of the winding control part 6 of 1st Embodiment. It is a flowchart which shows operation | movement of 1st Embodiment. It is a block diagram of the winding control part 6 of 2nd Embodiment. It is a flowchart which shows operation | movement of 2nd Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiments of the present invention are not limited to the present embodiment. FIG. 1 is an overall front view of a circular knitting machine having an electronic needle selection function according to a first embodiment of the present invention. As shown in FIG. 1, the circular knitting machine 1 controls a knitting unit 2 that produces a tubular knitted fabric, a winding mechanism unit 3 that winds up the produced tubular knitted fabric, and a winding mechanism unit 3. And a winding unit including the winding control unit 6. On the apparatus main body side including the knitting unit 2, a control operation unit 20 for performing data input to the apparatus, various displays, and the like is provided.

  In FIG. 1, the knitting portion 2 is installed above a bed 22 supported by a plurality of legs 21. A plurality of posts 24 are erected on the bed 22, and a horizontal member 25 is fixed to the upper part by a connecting member. The yarn supplying section 9 is supported on the horizontal member 25. Below the bed 22, a knitted fabric is sandwiched between a plurality of rollers, a tension roller 4a that feeds the tensioned knitted fabric with a certain tension, and a winding roller 4b that winds the fed knitted fabric and a roller drive. A take-up mechanism 3 including a take-up servo motor 5 is installed. Below the bed 22 is provided an overall control unit 8 for controlling the control operation unit 20 and the entire circular knitting machine.

  FIG. 2 is a block diagram of the winding control unit 6 in the apparatus of the first embodiment. The overall control unit 8 controls the entire circular knitting machine. In this embodiment, the knitting condition setting and the winding condition setting are integrally controlled. Among the knitting conditions, the knitting condition setting unit 11 stores in advance the specific knitting data 14 that affects the production amount of the knitted fabric during operation and the production amount data 15 that changes in response to the change of the specific knitting data 14. ing. The specific knitting data 14 and the corresponding production volume data 15 constitute a data file DF.

  The specific knitting data 14 includes at least one of knitting structure data, stitch amount data, knitting timing data, and used yarn data. In the data file DF, each data is read by an information transmission means such as USB or LAN.

  Position control data 18 corresponding to the winding amount of the knitted fabric is set in the winding condition setting unit 17. The position control data 18 changes in synchronization with the changing production data 15. By reading the data file DF, the position control data 18 changes in synchronization with the production amount data 15 that changes based on the change in the specific knitting data 14. The position control data 18 is input corresponding to each course of the knitting structure.

  The knitting unit 2 of FIG. 1 is driven by a main motor 7 by driving a cylinder of the knitting unit 2 in which a plurality of knitting needles (not shown) are slidably accommodated in a needle groove based on knitting conditions set for a desired knitted fabric. The yarn is rotated, the yarn is supplied from the yarn supplying section 9 to the knitting needle, the stitches are stacked in a spiral shape, and a tubular knitted fabric is knitted. The main motor 7 that rotates the cylinder of the knitting unit 2 is controlled by the overall control unit 8 so as to be driven at a predetermined rotational speed by frequency control using an inverter, for example.

  The winding control unit 6 in FIG. 2 is provided in the winding servo driver 10 provided in the winding mechanism unit 3 in FIG. 1, the overall control unit 8, and the winding mechanism unit 3 in FIG. A gear ring disposed inside the bed and the take-up mechanism unit 3 are coupled to each other), and a knitting machine rotation detection unit (rotary encoder) 12 that detects the rotation speed of the cylinder by the main motor 7. I have.

  The take-up servo driver 10 performs PWM control by outputting a PWM control output (shown c) to the take-up servo motor 5, and the rotation angle (shown) of the cylinder by the main motor 7 input from the knitting portion rotation detecting unit 12 is illustrated. The rotation angle of the winding servo motor 5 is controlled by giving the winding servo motor 5 the number of output pulses of the command pulse synchronized with the knitting portion rotation detection signal e). The winding servo driver 10 is not shown, but in addition to the motor control / PWM control output unit and the knitting unit rotation detection signal input unit, a serial communication unit with the overall control unit, a winding servo driver 5 described later, A feedback current detection unit and a motor rotation angle input unit.

  In the position control mode, control is performed to rotate the take-up servo motor 5 in FIG. 2 at a constant rotation angle (motor rotation signal in the drawing b) with respect to the rotation of the cylinder of the knitting unit. In this position control, high-precision rotation angle control of the take-up servomotor 5 is performed while maintaining a constant take-up tension. Therefore, the position control is affected by mechanical load fluctuations such as gears and rollers of the take-up mechanism 3. Therefore, it is possible to always wind up the same knitted fabric production amount and to wind it with a stable winding tension.

  The overall control unit 8 outputs position control data (d in the drawing) corresponding to the knitting structure data of the current course to the winding servo driver 10. The take-up servo driver 10 performs PWM control output corresponding to the position control data to the take-up servo motor 5, thereby performing motor control (position control data and current of the take-up servo motor 5 in the position control mode). C) is performed.

  When the specific knitting data 14 is read, the overall control unit 8 controls the actuator, stitch, timing, striper, etc. (not shown) of the knitting unit 2 and electric power supplied to the apparatus under the knitting conditions.

  The operation of the winding control device according to the first embodiment having the above configuration will be described below. FIG. 3 is a flowchart showing this operation. As a step before entering this flowchart, for example, a data file DF is created for each course of the knitting organization. A data file DF of the production volume data 15 corresponding to the specific knitting data 14 is stored in the overall control unit 8 in advance.

  First, the data file DF of the overall control unit 8 is read (step S1). Then, the operation starts, and knitting of the knitted fabric is started under the knitting conditions including the read knitting structure (step S2). Thereafter, the apparatus reads the production amount data input corresponding to the knitting structure data of the current course (step S3), and the read production amount data is synchronized with the position control data and obtained to the servo driver 10. The position control data is output, the rotation angle of the take-up servo motor 5 is controlled, the take-up amount of the position control data is executed (step S4), and the process proceeds to step S3. Since the production volume data is set for each course of the knitting organization, the production volume data is read and executed for each course. Steps S3 and S4 are repeated until the operation is stopped.

  The overall control unit 8 produces the knitted fabric that can be generated depending on the magnitude of the change in the knitted fabric production amount when the winding amount is increased or decreased simultaneously with the change in the knitting structure and the timing at which the servo driver 10 receives the position control data. In order to correct the difference between the amount and the winding amount, it is possible to implement a correction program that issues a command for increasing / decreasing the winding amount to the winding mechanism unit 3 by shifting several pulses earlier or later.

  As described above, in the first embodiment, the production amount data corresponding to the change in the specific knitting data that affects the production amount of the knitted fabric during operation is selected from the knitting data related to the knitting conditions under the position control mode. The position control data corresponding to the winding amount of the knitted fabric is set in synchronization with the change in the production amount data. As a result, even when the change in the production amount of the knitted fabric is large, the change in the production amount data is immediately obtained from the change in the specific knitting data under the position control mode with little influence on the knitted fabric quality, Since this and position control data can be synchronized to match the knitted fabric production amount and the winding amount, the knitted fabric can be wound with an appropriate and stable winding tension without stopping the operation of the device. It becomes. It is also possible to cope with complicated changes in the knitting conditions.

  Next, the winding control device of the second embodiment will be described. The overall control unit 8 differs from the first embodiment in that the production amount data 15 and the position control data 18 are directly synchronized, thereby substantially controlling the knitting condition setting and the winding condition setting simultaneously. In the second embodiment, an existing apparatus that does not support production volume data is used as it is, and the knitting condition setting and the winding condition setting are performed by separate control.

  FIG. 4 shows a block diagram of the winding control unit 6 in the apparatus of the first embodiment. The overall control unit 8 controls the entire circular knitting machine. Among the knitting conditions, the knitting condition setting unit 11 includes specific knitting data 14 that affects the production amount of the knitted fabric during operation, and the specific knitting data 14. Of the knitting conditions that change in response to the change, for example, knitting operation data 16 such as rotation speed data of the knitting unit 2 is stored in advance. Since the rotation speed data 16 is composed of numerical values, the exchange of data is fast and data creation is easy. The specific knitting data 14 and the rotational speed data 16 constitute a data file DF.

  Position control data 18 corresponding to the winding amount of the knitted fabric is set in the winding condition setting unit 17. By reading this data file DF, the rotational speed data 16 and the default data 20 are collated for each course of the knitting organization, the production volume data 15 corresponding to the matched default data 20 is obtained, and the production volume is obtained by repeating this. The data 15 is changed, and the position control data 18 is changed in synchronization therewith. In this way, the position control data 18 is set based on the change in the specific knitting data 14.

  The existing apparatus can execute the knitting by inputting and reading the knitting data such as the knitting structure data of the knitting condition in the setting of the knitting condition. However, as in the first embodiment, the production amount data is input and read and the winding is performed. In order to be able to execute this with an existing device, equipment such as development of data creation / reading software, expansion of circuits, etc. Where investment is required, in the second embodiment, the configuration of the existing apparatus is used as it is.

  Further, for example, the knitting organization data of the specific knitting data has a large amount of data and is difficult to collate data, and it takes time and labor to create the default data. For this reason, in the second embodiment, although it is difficult to cope with complicated changes in the knitting conditions, the correspondence between the production amount data and the position control data is determined according to the knitting operation data such as the rotation speed data of the knitting unit and the predetermined value. Instead of collating with data, the existing apparatus is simply used as it is, so that the production amount and the winding amount of the knitted fabric are matched.

  When the rotational speed of the knitting unit 2 is not lower than the predetermined speed, depending on the knitting conditions such as the knitting structure, stitch amount, knitting timing, yarn used, etc., which is the specific knitting data, the knitting part 2 may not be knitted without knitting defects, Timing control, striper, etc. cannot be operated. For this reason, in the existing apparatus, the rotation speed data has a specification that can be input to the data file, and also changes in response to changes in the specific knitting data. Yes. Other configurations are the same as those of the first embodiment.

  FIG. 5 is a flowchart showing the operation of the second embodiment. As a step before entering this flowchart, a data file DF is created for each course of the knitting organization. The specific knitting data 14 and the corresponding data file DF of the rotational speed data 16 are stored in the overall control unit 8 in advance.

  First, the data file DF is read by the overall control unit 8 (step T1). Then, the operation starts, and knitting of the knitted fabric is started under the knitting conditions including the read knitting structure (step T2).

  Thereafter, the apparatus reads the rotational speed data corresponding to one course of the current knitting structure data (step T3), and confirms whether or not there has been a change from the rotational speed data of the previous course corresponding to the change of the specific knitting data 15 ( Step T4). If not changed, the production amount data and the position control data are not changed (step T7-2), and the process proceeds to step T3. If it has changed, it is checked whether this is the default data set as “high speed” (step T5-1). If it is “high speed”, the production volume data corresponding to this is acquired (step T6-1). Similarly, it is checked whether or not the predetermined data is set as “medium speed”, “inching (inching)”, and “low speed” (steps T5-2, T5-3, T5-4). Data is acquired (steps T6-2, T6-3, T6-4).

  Thereafter, the acquired production amount data and position control data are synchronized, and the position control data obtained is output to the servo driver 10, the rotation angle of the take-up servo motor 5 is controlled, and the take-up amount of the position control data Is executed (step T7-1), and the process proceeds to step T3. If none of the rotation speed data belongs, that is, if there is an abnormality in the data, the production amount data and the position control data are not changed (step T7-2), and the process proceeds to step T3. The rotation speed data is read for each course, and steps T3 to T7-1 or T7-2 are repeated until the knitting machine is stopped. In this way, the position control data changes in synchronization with the change in the production data.

  As described above, in the second embodiment, the correspondence between the production amount data and the position control data in the first embodiment is replaced with the collation of the knitting operation data (rotational speed data) and the predetermined data, so that the existing apparatus can be simply used. The production amount of the knitted fabric and the winding amount can be matched by using the above configuration as it is.

  As described above, in the present invention, even when the production amount of the knitted fabric changes greatly during operation, the knitted fabric is not stopped in the position control mode with little influence on the knitted fabric quality without stopping the operation of the apparatus. Can be wound with an appropriate and stable winding tension.

1: circular knitting machine 2: knitting unit 3: winding mechanism unit 4: winding roller 5: winding servo motor 6: winding control unit 8: overall control unit 11: knitting condition setting unit 14: specific knitting data unit 15 : Production amount data part 16: Knitting operation data (rotational speed data part)
17: Winding condition setting unit 18: Position control data unit 19: Data collation unit 20: Default data unit DF: Data file

The present invention relates to a winding control method and apparatus for winding a tubular knitted fabric produced by a circular knitting machine .

In order to achieve the above object, a winding control method and apparatus for a circular knitting machine according to the present invention sets a knitted fabric by a winding mechanism including a winding roller and a winding servomotor for driving the roller. A tubular knitted fabric produced by the knitting unit is wound based on the knitting conditions, and the winding mechanism unit is controlled by the winding control unit. Specific knitting data that influences the production amount of the knitted fabric during operation among the knitting conditions under a position control mode in which the winding control unit controls the winding amount according to the position control data. The production amount data is changed in response to the change in position, and the position control data corresponding to the winding amount of the knitted fabric is set to change synchronously with the change in the production amount data.

FIG. 4 shows a block diagram of the winding control unit 6 in the apparatus of the second embodiment . The overall control unit 8 controls the entire circular knitting machine. Among the knitting conditions, the knitting condition setting unit 11 includes specific knitting data 14 that affects the production amount of the knitted fabric during operation, and the specific knitting data 14. Of the knitting conditions that change in response to the change, for example, knitting operation data 16 such as rotation speed data of the knitting unit 2 is stored in advance. Since the rotation speed data 16 is composed of numerical values, the exchange of data is fast and data creation is easy. The specific knitting data 14 and the rotational speed data 16 constitute a data file DF.

Claims (8)

A take-up roller including a take-up roller and a take-up servo motor for driving the roller winds up the tubular knitted fabric produced by the knitting unit based on the knitting conditions set for the knitted fabric, and the take-up control unit In the winding control method of the electronic pattern knitting machine for controlling the winding mechanism,
Under the position control mode for controlling the winding amount according to the position control data by the winding control unit,
Among the knitting conditions, the production amount data is changed in response to a change in the specific knitting data that affects the production amount of the knitted fabric during operation. Set the position control data corresponding to the amount to change synchronously,
Winding control method for circular knitting machines. In claim 1,
The specific knitting data includes at least one of knitting structure data, stitch amount data, knitting timing data, and use yarn data,
A winding control method for a circular knitting machine, in which changes in production data corresponding to changes in the specific knitting data are stored in advance, and the changed position control data is set based on the changes in the specific knitting data . In claim 2,
A winding control method for a circular knitting machine, wherein the specific knitting data is set for each course of knitting organization. In claim 1,
A change in the knitting operation data corresponding to the change in the specific knitting data among the knitting conditions is stored in advance, the knitting operation data and the default data corresponding to the production volume data are collated, and the matched default data The production volume data is obtained from this, and the production volume data is changed by repeating this, and the position control data is set to change in synchronization with the change of the production volume data. Control method. In claim 4,
A winding control method for an electronic pattern knitting machine, wherein the knitting operation data is rotation speed data of the knitting unit. In claim 5,
The rotational speed data and the predetermined data are collated for each course of the knitting organization, and if the rotational speed data is not changed, the production amount data corresponding to the matching predetermined data is obtained, and the production amount data and the position control data are obtained. A winding control method for a circular knitting machine, in which the settings of the production volume data and the position control data are kept as they are without performing synchronization of the next course and the next course is collated. In claim 5 or 6,
Four types of the predetermined data are set, the first data is the inching speed default data, the second data is the lower speed default data than the first data, and the third data is the medium speed default data faster than the first data. The winding control method of an electronic pattern knitting machine, wherein the fourth data is high-speed predetermined data earlier than the third data. A take-up roller including a take-up roller and a take-up servo motor for driving the roller winds up the tubular knitted fabric produced by the knitting unit based on the knitting conditions set for the knitted fabric, and the take-up control unit A circular knitting machine having an electronic needle selection function equipped with a winding control device for controlling the winding mechanism,
The winding control unit is under a position control mode for controlling to take up the winding amount according to the position control data.
Among the knitting conditions, the production amount data is changed in response to a change in the specific knitting data that affects the production amount of the knitted fabric during operation. A circular knitting machine having an electronic needle selection function in which position control data corresponding to the amount is set to change synchronously.

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