EP3530788B1 - Antriebssteuerungsverfahren für webstuhl und antriebssteuerungsvorrichtung für webstuhl - Google Patents

Antriebssteuerungsverfahren für webstuhl und antriebssteuerungsvorrichtung für webstuhl Download PDF

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Publication number
EP3530788B1
EP3530788B1 EP19153968.3A EP19153968A EP3530788B1 EP 3530788 B1 EP3530788 B1 EP 3530788B1 EP 19153968 A EP19153968 A EP 19153968A EP 3530788 B1 EP3530788 B1 EP 3530788B1
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EP
European Patent Office
Prior art keywords
rotational speed
weft
rotational
driving
main
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EP19153968.3A
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English (en)
French (fr)
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EP3530788A1 (de
Inventor
Naoyuki Ito
Yuichiro KOBORI
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Tsudakoma Corp
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Tsudakoma Industrial Co Ltd
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Publication of EP3530788A1 publication Critical patent/EP3530788A1/de
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    • DTEXTILES; PAPER
    • D03WEAVING
    • D03DWOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/002Avoiding starting marks
    • DTEXTILES; PAPER
    • D03WEAVING
    • D03DWOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/27Drive or guide mechanisms for weft inserting
    • D03D47/275Drive mechanisms
    • DTEXTILES; PAPER
    • D03WEAVING
    • D03DWOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/005Independent drive motors
    • DTEXTILES; PAPER
    • D03WEAVING
    • D03DWOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/12Driving, starting, or stopping arrangements; Automatic stop motions for adjusting speed

Definitions

  • the present invention relates to a driving control method of a loom in which driving of a driving motor that drives a main shaft such that the main shaft is rotationally driven at the time of a steady-state operation in accordance with a set rotational speed that has been previously set is controlled, and to a driving control device therefor.
  • the rotational speed of a main shaft at the time of a steady-state operation is previously set as a set rotational speed, and, at the time of the steady-state operation, the main shaft is driven by a driving motor such that the main shaft is rotationally driven at the set rotational speed to thereby perform weaving.
  • Japanese Patent Application Publication JP2004-232188 discloses a loom in which the torque of a drive motor in an acceleration period of the loom is set to a high state, with respect to the usual torque value. After the acceleration period the torque value is changed to the usual output torque value.
  • an excessive load may be applied to a main-shaft driving device including the driving motor depending upon, for example, weaving conditions.
  • a case in which the set rotational speed is high is an example. That is, when the set rotational speed is high and the start-up time is short, since the driving motor needs to be accelerated in accordance with the set rotational speed and the start-up time thereof, an excessive load may be applied to the main-shaft driving device at the time of start-up depending upon the set rotational speed thereof.
  • the load that is applied to the main-shaft driving device at the time of start-up is large. Therefore, even in these cases, when an attempt is made to start up the main shaft in a short time as mentioned above, an excessive load is applied to the main-shaft driving device.
  • a loom may be started by a starting method in which the start-up time that is assumed in raising the rotational speed of the main shaft to the set rotational speed is a longer time (a period for a plurality of cycles of the loom) instead of a short time as mentioned above and in which the rotational speed of the main shaft is linearly increased in the long start-up time.
  • the start-up time that is assumed in raising the rotational speed of the main shaft to the set rotational speed is a longer time (a period for a plurality of cycles of the loom) instead of a short time as mentioned above and in which the rotational speed of the main shaft is linearly increased in the long start-up time.
  • a weaving bar (light filling bar) may occur in a fabric.
  • the rotational speed of the main shaft is linearly raised to the set rotational speed for a plurality of cycles of the loom, the acceleration slope of the rotational speed of the main shaft becomes gentle. Therefore, during the few cycles immediately after starting the start-up, the loom is operated with the rotational speed of the main shaft being low, and weaving accompanied by a weft insertion is performed in this state.
  • a driving control method of a loom according to the present invention is one in which, in the loom in which driving of a driving motor of a main-shaft driving device is controlled, a start-up rotational speed that is set to a rotational speed that is lower than a set rotational speed, that is less than or equal to a rotational speed that is determined by considering a load of the main-shaft driving device, and that is set so as to be greater than or equal to 25% of the set rotational speed is previously set, the main-shaft driving device driving a main shaft such that the main shaft is rotationally driven at a time of a steady-state operation in accordance with the set rotational speed that has been previously set.
  • the start-up is performed while being accompanied by a weft insertion in a start-up period for one or more cycles of the loom, and control of the driving motor from when the start-up is started is performed in accordance with the start-up rotational speed, and, when and after the rotational speed of the main shaft has reached the start-up rotational speed, control of the driving of the driving motor is performed such that the rotational speed of the main shaft is increased from the start-up rotational speed to the set rotational speed in accordance with a predetermined rotational-speed increase mode.
  • a driving control device controls driving of a driving motor of a main-shaft driving device that drives a main shaft such that the main shaft is rotationally driven at a time of a steady-state operation in accordance with a set rotational speed that has been previously set, controls an operation of each weft-insertion related device involved in a weft insertion to perform the weft insertion, and includes a storage section that stores a start-up rotational speed and a driving set value, the start-up rotational speed being set to a rotational speed that is lower than the set rotational speed, being less than or equal to a rotational speed that is determined by considering a load of the main-shaft driving device, and being set so as to be greater than or equal to 25% of the set rotational speed, the driving set value being set in accordance with a rotational-speed increase mode that has been predetermined for increasing a rotational speed of the main shaft from the start-up rotational speed to the set rotational speed.
  • the driving of the driving motor and the operation of each weft-insertion related device are controlled such that a start-up of the loom from when the start-up of the loom is started to when the rotational speed of the main shaft reaches the set rotational speed is performed while being accompanied by a weft insertion in a start-up period for one or more cycles of the loom, and control of the driving motor from when the start-up is started is performed in accordance with the start-up rotational speed, and, when and after the rotational speed of the main shaft has reached the start-up rotational speed, the control of the driving motor is performed based on the driving set value such that the rotational speed of the main shaft is increased from the start-up rotational speed to the set rotational speed in accordance with the rotational-speed increase mode.
  • the aforementioned "one cycle of a loom” is a period corresponding to a period in which the main shaft rotates once (0° to 360°) during continuous operation of the loom, and a period in which, during the one rotation, a series of weaving operations (weft insertion to beating) is performed once.
  • "Weft-insertion related devices” are devices that are involved in a weft insertion of a weft drawn out from a weft supply package, and include, for example, a measuring-and-storing device (stopper pin) and a main nozzle.
  • weft-insertion devices include, for example, an auxiliary main nozzle, a sub-nozzle, a weft brake, and a clamper, weft-insertion related devices also include these.
  • the rotational-speed increase mode is determined so as to include a state in which the main shaft is rotationally driven for the one or more cycles of the loom at one or more intermediate rotational speeds that are determined as rotational speeds that are lower than the set rotational speed and higher than the start-up rotational speed.
  • a rotational-speed increase amount towards the one or more intermediate rotational speeds may be set at the loom, and the control of the driving of the driving motor in a process of increasing the rotational speed of the main shaft from the start-up rotational speed to the set rotational speed may be performed based on the rotational-speed increase amount.
  • the driving set value is set so as to include the rotational-speed increase amount.
  • a basic weft-insertion condition which is a weft-insertion condition for a weft insertion at the time of the steady-state operation, is previously set at the loom, and the weft insertion at the time of the steady-state operation is performed in accordance with the basic weft-insertion condition;
  • the driving control method and the driving control device according to the present invention may be such that, in the start-up period, a weft insertion when the main shaft is rotationally driven in accordance with the start-up rotational speed and a weft insertion when the main shaft is rotationally driven in accordance with the one of more intermediate rotational speeds are performed in accordance with weft-insertion conditions determined in accordance with the rotational speeds corresponding thereto.
  • a condition of the weft-insertion when the main shaft is rotationally driven in accordance with the start-up rotational speed and a condition of the weft-insertion when the main shaft is rotationally driven in accordance with the one or more intermediate rotational speeds may be determined by a calculation based on the basic weft-insertion condition and the rotational speeds corresponding thereto.
  • weft-insertion condition here is a condition in which operation timings of the weft-insertion related devices are set.
  • control of the driving motor from when the start-up is started is performed in accordance with the start-up rotational speed that has been set as described above, and control of the driving motor is performed in accordance with the rotational-speed increase mode when and after the rotational speed of the main shaft has reached the start-up rotational speed.
  • the start-up period is set to a long period for a plurality of cycles of the loom and the rotational speed of the main shaft is increased to the set rotational speed with a gentle and constant acceleration slope, since a sufficient beating force can be generated from the loom cycle immediately after starting the start-up, it is possible to prevent the occurrence of a weaving bar in a fabric caused by the aforementioned blank beating or insufficient beating force.
  • the present invention assumes that a weft insertion is performed in the start-up period by fixing the rotational-speed increase mode so as to include a state in which the main shaft is rotationally driven for one cycle or more of the loom at the intermediate rotational speed such as those mentioned above.
  • This weft insertion can be stably performed.
  • the weft insertion in the start-up period is performed under an optimal weft-insertion condition.
  • determining the weft-insertion condition for a weft insertion in the start-up period by a calculation based on the basic weft-insertion condition such as that described above and each of the aforementioned rotational speed, even if the set rotational speed or the rotational-speed increase mode is changed, the trouble of manually inputting the weft-insertion condition for each change is eliminated. Therefore, it is possible to reduce the burden on an operator in a setting operation.
  • a weft-insertion device 10 includes a weft supply package 11, a measuring-and-storing device 12 that stores a weft drawn out from the weft supply package 11 by a length corresponding to a weft-insertion length, a main nozzle 13 for inserting a weft, a plurality of sub-nozzles 14 that assist the movement of travel of the weft ejected from the main nozzle 13, and a thread cutter 15 for cutting the inserted weft.
  • the weft-insertion device 10 also includes an auxiliary main nozzle 16 that is provided on an upstream side of the main nozzle 13 and that assists in the weft insertion performed by the main nozzle 13, and a weft brake device 17 for causing a braking force to act on the weft at the end of the weft insertion.
  • the main nozzle 13 and the auxiliary main nozzle 16 are connected to a fluid supply source 18, which supplies compressed air, via electromagnetic on-off valves 13a and 16a, which are provided in correspondence with the main nozzle 13 and the auxiliary main nozzle 16, and pressure regulators 13b and 16b for adjusting the pressure of the compressed air that is supplied to the nozzle 13 and the nozzle 16.
  • Each sub-nozzle 14 is connected to the fluid supply source 18, which is used in common by the main nozzle 13, via an electromagnetic on-off valve 14a, which is provided in correspondence with the sub-nozzle 14, and a pressure regulator 14b, which is used in common by each sub-nozzle 14.
  • the electromagnetic on-off valves 13a and 16a are controlled at a previously set jetting start timing and compressed air is supplied to the main nozzle 13 and the auxiliary main nozzle 16, and, subsequently, at a weft-insertion start timing, in the measuring-and-storing device 12, a stopper pin 12a is driven and the stopping of the weft on a storage drum 12b by the stopper pin 12a is released.
  • a weft-insertion operation in which the weft is ejected from the main nozzle 13 is started.
  • weft ejected from the main nozzle 13 travels into a warp shed while the movement of the weft is assisted by compressed air ejected from the sub-nozzles 14. Then, at a weft-insertion end timing, which is a timing in which an end of the weft reaches a predetermined position on the opposite side of weft supply, in the measuring-and-storing device 12, by stopping the weft by the stopper pin 12a, the weft is restrained and stops traveling, so that one weft insertion is completed. Note that the jetting of compressed air from the main nozzle 13 and the auxiliary main nozzle 16 is stopped at a jetting end timing that has been set as a timing during a weft-insertion period.
  • the travel speed of the weft is reduced, and shock that is applied to the weft when restrained by the aforementioned stopper pin 12a is reduced.
  • the inserted weft is beaten with respect to a cloth fell by a reed 19, and a warp shed is closed, so that the inserted weft is in a woven state at the cloth fell.
  • the weft that is provided consecutively with the main nozzle 13 is cut by the thread cutter 15. By this, one end of the weft inserted into the main nozzle 13 becomes a free end, thereby making it possible to perform the next weft insertion.
  • a warp shedding device (not shown) that forms/closes a warp shed and the reed 19 are connected to a main shaft 20 of the air jet loom 1, and are driven during weaving in a predetermined mode with the main shaft 20 as a driving source.
  • the weft-insertion device 10 also includes a weft-insertion control device 32 that controls the operation of each of the electromagnetic on-off valves 13a and 16a that control the supply of compressed air with respect to the main nozzle 13, the auxiliary main nozzle 16, and each sub-nozzle 14, an advancing-and-retreating operation of the stopper pin 12a in the measuring-and-storing device 12, and the operation of the weft brake device 17 (more specifically, the driving of a driving motor 17b for driving a brake member 17a in the weft-insertion device 10).
  • a weft-insertion control device 32 controls the operation of each of the electromagnetic on-off valves 13a and 16a that control the supply of compressed air with respect to the main nozzle 13, the auxiliary main nozzle 16, and each sub-nozzle 14, an advancing-and-retreating operation of the stopper pin 12a in the measuring-and-storing device 12, and the operation of the weft brake device 17 (more specifically, the driving of a driving motor 17b for driving a brake member 17a in the we
  • the weft-insertion control device 32 includes a storage unit 32a.
  • the storage unit 32a stores set values of, for example, a jetting start/end timing of the main nozzle 13, the auxiliary main nozzle 16, and each sub-nozzle 14, the weft-insertion start/end timing, and an operation start/end timing of the weft brake device 17, as weft-insertion conditions.
  • the air jet loom 1 includes an input setting unit 40, and each set value above is set at the input setting unit 40, is transmitted to the weft-insertion control device 32 from the input setting unit 40, and is stored in the storage unit 32a.
  • the air jet loom 1 also includes an angle detecting unit 50 that detects the rotation angle of the main shaft 20, and is configured to detect the rotation angle of the main shaft 20 in units of one rotation. The detected rotation angle of the main shaft 20 is also output to the weft-insertion control device 32.
  • the weft-insertion control device 32 controls, for example, the operation of each of the electromagnetic on-off valves 13a, 14a, and 16a, the advancing-and-retreating operation of the stopper pin 12a, and the operation of the weft brake device 17 in the aforementioned weft-insertion device 10.
  • the weft-insertion control device 32 performs control to open the electromagnetic on-off valve 13a corresponding to the main nozzle 13 and the electromagnetic on-off valve 16a corresponding to the auxiliary main nozzle 16.
  • the supply of compressed air to the main nozzle 13 and the auxiliary main nozzle 16 is started, and, at the jetting start timing, the jetting of compressed air from the main nozzle 13 and the auxiliary main nozzle 16 is started.
  • the weft-insertion control device 32 When the set value of the jetting end timing that has been set with respect to the main nozzle 13 and the auxiliary main nozzle 16 and the crank angle match, the weft-insertion control device 32 performs control to close each of the electromagnetic on-off valves 13a and 16a that has been opened as described above. By this, the supply of compressed air to the main nozzle 13 and the auxiliary main nozzle 16 is stopped, and, at the jetting end timing, the jetting of compressed air from the main nozzle 13 and the auxiliary main nozzle 16 is stopped.
  • the weft-insertion control device 32 performs control to open the electromagnetic on-off valves 14a corresponding to the respective sub-nozzles 14. By this, the supply of compressed air to each sub-nozzle 14 is started, and, at each jetting start timing, the jetting of compressed air from each sub-nozzle 14 is started.
  • the weft-insertion control device 32 performs control to close each of the electromagnetic on-off valves 14a. By this, the supply of compressed air to each sub-nozzle 14 above is stopped, and, at each jetting end timing, the jetting of compressed air from each sub-nozzle 14 is stopped.
  • the weft-insertion control device 32 performs control to cause the stopper pin 12a to retreat in order to move the stopper pin 12a away from the storage drum 12b (more specifically, control a driving device, such as a solenoid, that drives the stopper pin 12a to advance or retreat the stopper pin 12a).
  • a driving device such as a solenoid
  • the measuring-and-storing device 12 is brought into a state in which the weft stored on the storage drum 12b is capable of being freed (weft insertable state).
  • the weft-insertion control device 32 performs control to advance the stopper pin 12a towards the storage drum 12b in order to bring the stopper pin 12a into a weft stoppable state.
  • the measuring-and-storing device 12 is brought into a state in which the weft is brought into a stoppable state, and, as the weft travels, the weft moving around the storage drum 12b is stopped by the stopper pin 12a, and the travel of the weft is stopped.
  • the weft-insertion control device 32 performs control to drive the brake member 17a by the driving motor 17b such that a braking force acts upon the weft.
  • the operation start timing is set as a timing of the end period of the weft-insertion process (weft-insertion end period). At the weft-insertion end period, the weft on the weft supply side is brought into a bent state by the brake member 17a, and the traveling weft is brought into a braked state.
  • the weft-insertion control device 32 performs control to drive the brake member 17a by the driving motor 17b so as to move away from the weft.
  • the operation end timing is set as an after-ending-of-weft-insertion timing). Then, by driving the brake member 17a the bent state of the weft is cancelled.
  • the advancing-and-retreating operation of the stopper pin 12a in the measuring-and-storing device 12, the jetting operations of the main nozzle 13, the auxiliary main nozzle 16, and each sub-nozzle 14, and the operation of the weft brake device 17 are controlled in accordance with the set values of the weft-insertion conditions stored in the storage unit 32a.
  • the operation of each device above is controlled in accordance with basic weft-insertion conditions as weft-insertion conditions for the steady-state operation.
  • the measuring-and-storing device 12 stopper pin 12a
  • the main nozzle 13 the auxiliary main nozzle 16, each sub-nozzle 14, and the weft brake device 17, whose operations are controlled in accordance with weft-insertion conditions in this way, correspond to the so-called weft-insertion related devices in the present invention.
  • the air jet loom 1 also includes a main control device 31.
  • the input setting unit 40 above is connected to the main control device 31.
  • the weft-insertion control device 32 above is also connected to the main control device 31.
  • the angle detecting unit 50 is connected to the main control device 31.
  • the rotation angle of the main shaft 20 detected by the angle detecting unit 50 is input to the main control device 31.
  • the rotation angle of the main shaft 20 detected by the angle detecting unit 50 is output to the weft-insertion control device 32 as described above via the main control device 31.
  • the air jet loom 1 includes an inverter 33 that controls the driving of a driving motor 60a of a main-shaft driving device 60 that rotationally drives the main shaft 20.
  • the air jet loom 1 is configured to control the driving of the driving motor 60a by controlling the inverter 33 on the basis of a target rotational speed of the main shaft 20.
  • the inverter 33 controls the driving of the driving motor 60a such that the driving motor 60a is driven at the rotational speed (target rotational speed) corresponding to the target rotational speed of the driving motor 60a by generating an output frequency corresponding to the target rotational speed of the main shaft 20 (main-shaft rotational speed).
  • the driving motor 60a is controlled so as to be driven at the rotational speed corresponding to the output frequency of the inverter 33.
  • the air jet loom 1 is configured such that the driving motor 60a is connected to the main shaft 20 via a drive transmission mechanism (not shown), and the rotation of the driving motor 60a (output shaft) is transmitted to the main shaft 20 via the drive transmission mechanism. Therefore, the main-shaft driving device 60 of the air jet loom 1 of the present embodiment also includes the drive transmission mechanism.
  • the air jet loom 1 includes the main control device 31, the weft-insertion control device 32, and the inverter 33.
  • Each control device is included in a driving control device 30 of the air jet loom 1.
  • the driving control device 30 instead of controlling the driving motor 60a such that, at the time of start-up of the loom, the main-shaft rotational speed is raised all at once to a certain set rotational speed, which is the rotational speed at the time of steady-state operation, as it is conventionally, the driving control device 30 performs the following.
  • the driving control device 30 first raises the main-shaft rotational speed to the start-up rotational speed that has been set as the rotational speed that is lower than the set rotational speed, and, when and after the main-shaft rotational speed has reached the start-up rotational speed, controls the driving motor 60a such that the main-shaft rotational speed is increased to the set rotational speed in accordance with the increase mode (rotational-speed increase mode) of the main-shaft rotational speed that has been predetermined.
  • a detailed structure of the driving control device 30 is described in detail below.
  • the driving control device 30 includes a driving control section 34 connected to the aforementioned inverter 33.
  • the driving control section 34 includes a storage section 34a that stores the set rotational speed and the start-up rotational speed. Further, the driving control section 34 is connected to the aforementioned main control device 31.
  • the aforementioned set rotational speed and start-up rotational speed are set at the input setting unit 40, and, by transmitting the aforementioned set rotational speed and start-up rotational speed to the driving control section 34 via the main control device 31 from the input setting unit 40, they are stored in the storage section 34a.
  • the rotation angle of the main shaft 20 detected by the angle detecting unit 50 and input to the main control device 31 as mentioned above is output to the driving control section 34 via the main control device 31.
  • the driving control section 34 outputs to the inverter 33 a frequency command signal corresponding to the target main-shaft rotational speed such that the inverter 33 generates an output frequency corresponding to the target main-shaft rotational speed as mentioned above. Therefore, in raising the main-shaft rotational speed towards the start-up rotational speed as mentioned above, when starting the start-up, the driving control section 34 outputs a frequency command signal corresponding to the start-up rotational speed, and the inverter 33 generates an output frequency corresponding to the start-up rotational speed in accordance with the frequency command signal.
  • a frequency command signal corresponding to the rotational-speed increase mode is output, and the inverter 33 generates an output frequency corresponding to the rotational-speed increase mode in accordance with the frequency command signal.
  • the start-up rotational speed is the rotational speed that is set as the rotational speed that is lower than the set rotational speed as mentioned above. Specifically, the start-up rotational speed is set as the rotational speed less than or equal to the rotational speed that is determined by considering the load that is applied to the main-shaft driving device 60 at the time of start-up of the loom. However, in the present invention, the start-up rotational speed is set so as to be greater than or equal to 25% of the set rotational speed. This is described in more detail as follows.
  • a case in which the set rotational speed is set at 1800 rpm that is very high compared to the rotational speed of general looms is used as an example.
  • the specification and the weaving conditions of the looms are the same, when an attempt is made to raise the main-shaft rotational speed to the set rotational speed in a time that is the same as the start-up time (the time required to increase the main-shaft rotational speed to the set rotational speed) of general looms, an excessive load is applied to the main-shaft driving device, and, thus, the aforementioned problems caused by this load may occur.
  • the start-up rotational speed is set after fixing the rotational speed (allowable rotational speed) that does not cause these problems to occur.
  • the allowable rotational speed differs depending upon, for example, the specification and the weaving conditions of the loom; however, in the present embodiment, 1000 rpm is used as an example.
  • the start-up rotational speed is set as the rotational speed less than or equal to the allowable rotational speed.
  • the start-up rotational speed is set so as to be greater than or equal to 25% of the set rotational speed as mentioned above. This is because the present invention assumes that, even in a start-up period from a state in which the main-shaft rotational speed is zero to when the main-shaft rotational speed is increased to the set rotational speed (start-up period), a weft insertion is performed.
  • the start-up rotational speed needs to be set such that the main-shaft rotational speed reaches the rotational speed that allows such a sufficient beating force to be acquired even immediately after starting the start-up.
  • the start-up rotational speed is basically not a problem as long as the start-up rotational speed is greater than or equal to 25% of the set rotational speed, depending up, for example, the specification and weaving conditions of the loom, the beating force may be insufficient even if the start-up rotational speed is greater than or equal to 25% of the set rotational speed. Therefore, in the present invention, the start-up rotational speed is desirably set as the rotational speed that is greater than or equal to 40% of the set rotational speed.
  • the start-up rotational speed is set at the maximum allowable rotational speed, that is, 1000 rpm.
  • 1000 rpm is the rotational speed that is greater than or equal to 40% of 1800 rpm, which is the set rotational speed.
  • the rotational-speed increase is mode is for determining how to increase the main-shaft rotational speed from the start-up rotational speed to the set rotational speed.
  • An example of the rotational-speed increase mode is one in which, with the number of rotational speeds (the so-called "intermediate rotational speeds" in the present application) that are higher than the start-up rotational speed and lower than the set rotational speed being determined to one or more, the main-shaft rotational speed is increased in stages by increasing the main-shaft rotational speed from the start-up rotational speed towards an intermediate rotational speed and by increasing the main-shaft rotational speed from the intermediate rotational speed to the set rotational speed.
  • the number of intermediate rotational speeds is two or more, a stage in which the main-shaft rotational speed is increased from the lower intermediate rotational speed to the higher rotational speed during this time is included.
  • the rotational-speed increase mode is determined such that the main-shaft rotational speed is increased in stages to the set rotational speed a plurality of times by a previously set predetermined rotational-speed increase amount at a time.
  • the rotational-speed increase mode of the present embodiment is set to a mode in which a rotational-speed range from the start-up rotational speed to the set rotational speed is equally divided into a plurality of portions and the main-shaft rotational speed is increased in stages to the set rotational speed through each intermediate rotational speed.
  • the rotational-speed increase mode is determined as a mode in which the range (1000 rpm to 1800 rpm) is divided into four portions and the main-shaft rotational speed is increased by a rotational-speed increase amount of 200 rpm at a time towards each intermediate rotational speed (1200 rpm, 1400 rpm, 1600 rpm).
  • the rotational-speed increase amount of 200 rpm is stored in the storage section 34a of the driving control section 34. Note that the rotational-speed increase amount is also input and set by the input setting unit 40 and is transmitted to the storage section 34a.
  • the raising of the main-shaft rotational speed to the set rotational speed at the time of start-up is performed by the aforementioned start-up control.
  • the starting method is one in which the raising of the main-shaft rotational speed to the aforementioned start-up rotational speed is performed by the start-up control, and, in the meantime, in increasing the main-shaft rotational speed to the set rotational speed after the main-shaft rotational speed has reached the start-up rotational speed, the main-shaft rotational speed is set by being controlled in accordance with the steady-state operation control. That is, the increasing of the main-shaft rotational speed towards the intermediate rotational speed and the increasing of the main-shaft rotational speed from the intermediate rotational speed towards the set rotational speed are performed in accordance with the steady-state operation control).
  • the rotational-speed increase mode of the present embodiment is one in which the period from when a frequency command signal is output from the driving control section 34 for increasing the main-shaft rotational speed to an intermediate rotational speed as mentioned above to when a frequency command signal is output next from the driving control section 34 for increasing the main-shaft rotational speed to an intermediate rotational speed (or the set rotational speed) as mentioned above is set by considering such influences mentioned above.
  • the rotational-speed increase mode is determined such that the period becomes two cycles of the loom. Moreover, in order to realize the rotational-speed increase mode, a set value (set period) of the aforementioned period (two cycles) is stored in the storage section 34a of the driving control section 34. This set period is also input and set by the input setting unit 40 and is transmitted to the storage section 34a.
  • the driving control device 30 of the present embodiment when, in order to start the operation of the air jet loom 1, an operator operates an operation button provided in the input setting unit 40 and an operation signal is output from the input setting unit 40 towards the main control device 31, the operation signal is input to the driving control section 34 via the main control device 31.
  • the driving control section 34 is switched to a state in which the aforementioned start-up control is performed as the operation signal is input, and outputs to the inverter 33 a frequency command signal corresponding to the start-up rotational speed (1000 rpm).
  • the driving of the driving motor 60a is controlled by performing the start-up control, and the main-shaft rotational speed is raised to the start-up rotational speed in a short time.
  • the driving control section 34 is switched to a state in which the driving motor 60a is controlled such that the main-shaft rotational speed is increased in accordance with the rotational-speed increase mode determined as mentioned above; however, in the present embodiment, the switching point in time is set to a point in time in which a period of about two rotations of the main shaft 20 has passed from the operation of the operation button. Specifically, the switching point in time needs to be set to a point in time that exceeds a period up to when the main-shaft rotational speed reaches the start-up rotational speed from the operation of the operation button (from the point in time in which the operation signal is generated).
  • the period in which the main-shaft rotational speed is raised to the set rotational speed by performing the start-up control from when the operation button is operated can be known from, for example, tests or past results. Therefore, in the present embodiment, the switching point in time is set as mentioned above by considering the known period. Specifically, the crank angle when starting the start-up is 300°, and the switching point in time is determined so as to become the point in time in which the crank angle reaches the second 360° (0°).
  • the switching point in time determined in this way is stored in the storage section 34a of the driving control section 34.
  • the driving control section 34 is configured to determine whether or not the crank angle has reached the switching point in time from when the operation button has been operated on the basis of the crank angle that is output from the main control device 31 and the switching point in time stored in the storage section 34a. Moreover, when the driving control section 34 has determined that the crank angle has reached the switching point in time, the driving control section 34 is switched to a state in which the steady-state operation control is performed from the start-up control, and a frequency command signal corresponding to the rotational-speed increase mode is output to the inverter 33.
  • the frequency command signal that is output from the driving control section 34 at the time of and after the switching becomes a frequency command signal corresponding to an intermediate command signal.
  • information that is stored in the storage section 34a is the rotational-speed increase amount (200 rpm) as that mentioned above instead of the intermediate rotational speed. Therefore, when the driving control section 34 outputs a frequency command signal, after the driving control section 34 has calculated the next rotational speed to be increased, the driving control section 34 outputs the calculated rotational speed.
  • the driving control section 34 of the present embodiment has the function of determining such a calculated rotational speed (calculation function).
  • the driving control section 34 adds the rotational-speed increase amount to the main-shaft rotational speed at the time of outputting the frequency command signal (start-up rotational speed or intermediate rotational speed) and outputs the frequency command signal corresponding to the calculated rotational speed determined thereby.
  • the rotational-speed increase amount that is stored in the storage section 34a and that is used to determine the next calculated rotational speed for outputting the next frequency command signal as mentioned above corresponds to the so-called driving set value in the present invention.
  • the main-shaft rotational speed is increased to the first intermediate rotational speed (1200 rpm).
  • the driving control section 34 is configured to store the set period (two cycles) in the storage section 34a and to output a frequency command signal corresponding to the rotational-speed increase mode for every two cycles. Further, the driving control section 34 is configured to calculate the calculated rotational speed by the calculation function such as that mentioned above at a predetermined timing (calculation timing) that is set before the point in time of output of the next frequency command signal.
  • the rotational speed that serves as a basis of a frequency command signal that is output at the later point in time is calculated at a calculation timing before the later point in time and after the earlier point in time (the switching point in time).
  • the later point in time becomes an earlier point in time and a point in time after two cycles becomes a later point in time, and, similarly to the above, the calculation of the calculated rotational speed and the output of a frequency command signal corresponding to the calculated rotational speed are performed.
  • the driving control section 34 is configured to, when the calculated rotational speed determined by the calculation function matches the set rotational speed, output a frequency command signal based on the set rotational speed stored in the storage section 34a instead of the calculated rotational speed, and disable the calculation function at the time of and after the output (that is, to not perform a calculation).
  • the main-shaft rotational speed is increased to the set rotational speed (1800 rpm), and at the time of and after the main-shaft rotational speed has reached the set rotational speed, the air jet loom 1 is brought into a state in which the main shaft 20 is rotationally driven at the set rotational speed (steady-state operation state) without increasing the main-shaft rotational speed further.
  • a line diagram of the mode of the present embodiment such as that described above in which the main-shaft rotational speed is increased becomes a solid line in Fig. 3 .
  • the actual change in the main-shaft rotational speed is as shown by a broken line in Fig. 3 .
  • the loom is started by temporarily raising the main-shaft rotational speed to the start-up rotational speed that is lower than the set rotational speed and that is set by considering the load that is applied to the main-shaft driving device 60 when starting the loom, and then by increasing the main-shaft rotational speed to the set rotational speed in accordance with the predetermined rotational-speed increase mode.
  • this starting method compared to the existing starting method (existing method) in which the main-shaft rotational speed is raised all at once to the set rotational speed as it has been conventionally, the load that is applied to the main-shaft driving device 60 at the time of start-up is reduced.
  • the load that is applied to the main-shaft driving device 60 is reduced as mentioned above, even if the loom is started in a control mode that is a mode at the time of start-up performed in existing general looms and that allows the main-shaft rotational speed to be raised to a target rotational speed (start-up rotational speed in the case of the present invention) in a short time, the load that is applied to the main-shaft driving device 60 at the time of start-up is allowed.
  • the rotational-speed increase mode is determined so as to include a plurality of intermediate rotational speed as mentioned above.
  • the rotational-speed increase mode may be a mode that does not include an intermediate rotational speed, that is, a mode in which the main-shaft rotational speed is increased all at once from the start-up rotational speed to the set rotational speed. Even in such a mode, compared to the existing method, the load that is applied to the main-shaft driving device 60 at the time of start-up is reduced. However, in this case, the main-shaft rotational speed changes continuously from the start-up rotational speed towards the set rotational speed.
  • the rotational-speed increase mode of the present embodiment is fixed to a mode that includes a plurality of intermediate rotational speed and that allows the main-shaft rotational speed to be increased in stages from the start-up rotational speed to the set rotational speed via each intermediate rotational speed.
  • the rotational-speed increase mode is determined such that one increase amount of the main-shaft rotational speed that is increased by outputting a frequency command signal is 200 rpm and the frequency command signal is output at an interval of two cycles of the loom.
  • the set period that is set to two cycles is set by considering the influences of, for example, the load that is applied to the main-shaft driving device 60 as mentioned above, and is a (sufficiently) longer period than a period that is required to increase the main-shaft rotational speed by the set rotational-speed increase amount (200 rpm).
  • the rotational-speed increase mode that is determined in this way, there exists a period in which the main shaft 20 is rotationally driven at the intermediate rotational speed while the main-shaft rotational speed is increased from the start-up rotational speed to the set rotational speed.
  • the rotational-speed increase amount (change amount) in the period in which the rotational speed is increased is also lower than that when the main-shaft rotational speed changes continuously.
  • the driving control device 30 of the present embodiment is configured to perform a weft insertion at the start-up period not in accordance with the aforementioned basic weft-insertion conditions but in accordance with weft-insertion conditions determined in correspondence with the rotational speed (start-up rotational speed or intermediate rotational speed (calculated rotational speed)) in each operation state of the loom existing for one cycle or more at an earlier point in time than a point in time when the frequency command signal corresponding to the set rotational speed is output.
  • the driving control section 34 is also connected to the aforementioned weft-insertion control device 32.
  • the driving control section 34 is configured to, at the point in time of outputting a frequency command signal to the inverter 33, output to the weft-insertion control device 32 the start-up rotational speed or intermediate rotational speed (calculated rotational speed) serving as a basis of the frequency command signal that is output.
  • the driving control section 34 is configured to, when the calculated rotational speed determined by the calculation function matches the set rotational speed, output to the weft-insertion control device 32 the set rotational speed stored in the storage section 34a instead of the calculated rotational speed.
  • the weft-insertion control device 32 is configured to determine, on the basis of the start-up rotational speed or the calculated rotational speed that is input from the driving control section 34 (hereunder generically called "input rotational speed"), the weft-insertion conditions corresponding to the respective input rotational speed, and to perform a weft insertion during two cycles from when the driving control section 34 has output a frequency command signal corresponding to the input rotational speed in accordance with the determined weft-insertion condition.
  • the weft-insertion control device 32 stores computing equations for determining the set values of the respective weft-insertion conditions corresponding to the input rotational speeds.
  • the computing equations include the set rotational speed and the set values (basic set values) of the basic weft-insertion conditions as fixed values, and each basic set value is set so as to be changed to the set value corresponding to the input rotational speed by using the ratio between the input rotational speed and the set rotational speed corresponding thereto.
  • the weft-insertion control device 32 determines the set values corresponding to the input rotational speed for the respective weft-insertion conditions by using the computing equations each time an input rotational speed is input from the driving control section 34 as mentioned above. Moreover, the weft-insertion control device 32 temporarily stores the determined set values of the respective weft-insertion conditions, and controls the operation of each weft-insertion related device as described above in accordance with the corresponding set value.
  • a weft insertion is performed by controlling the operation of each weft-insertion related device in according with the set value of its corresponding weft-insertion condition corresponding to the start-up rotational speed.
  • a weft insertion is performed by controlling the operation of each weft-insertion related device in accordance with the set value of its corresponding weft-insertion condition corresponding to the calculated rotational speed.
  • the weft insertion in the start-up period is performed under the optimal weft-insertion conditions corresponding to the respective operation states, and each weft insertion is stably performed.
  • the operation state is brought into a state in which the main-shaft rotational speed is controlled in accordance with the set rotational speed; however, in the operation state, a weft insertion is performed in accordance with the basic set value of the basic weft-insertion condition.
  • the set values of the weft-insertion conditions corresponding to the respective operation states are calculated by using previously set computing equations. According to this, even if, for example, the set rotational speed and the basic set values of the basic weft-insertion conditions are changed, an operator does not need to go to the trouble of manually inputting a weft-insertion condition corresponding to the start-up rotational speed and a weft-insertion condition corresponding to an intermediate rotational speed for every change, thereby reducing the burden on the operator in a setting operation.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)

Claims (10)

  1. Verfahren zur Antriebssteuerung einer Webmaschine, bei der der Antrieb eines Antriebsmotors (60a) einer Hauptwellen-Antriebsvorrichtung (60) gesteuert wird, wobei die Hauptwellen-Antriebsvorrichtung (60) eine Hauptwelle (20) derart antreibt, dass die Hauptwelle (20) zu einem Zeitpunkt eines stationären Betriebs in Übereinstimmung mit einer eingestellten Drehzahl, die zuvor eingestellt worden ist, drehend angetrieben wird, wobei das Verfahren umfasst:
    vorheriges Einstellen einer Anlaufdrehzahl, die auf eine Drehzahl eingestellt ist, die niedriger als die eingestellte Drehzahl ist;
    beim Durchführen eines Anlaufs der Webmaschine vom Beginn des Anlaufs bis die Drehzahl der Hauptwelle (20) die eingestellte Drehzahl erreicht, Durchführen des Anlaufs unter Begleitung eines Schusseintrags in einer Anlaufperiode für einen oder mehrere Zyklen der Webmaschine, und
    Durchführen einer Steuerung des Antriebsmotors (60a) vom Beginn des Anlaufs in Übereinstimmung mit der Anlaufdrehzahl, und, wenn und nachdem die Drehzahl der Hauptwelle (20) die Anlaufdrehzahl erreicht hat, Durchführen einer Antriebssteuerung des Antriebsmotors (60a) derart, dass die Drehzahl der Hauptwelle (20) von der Anlaufdrehzahl auf die eingestellte Drehzahl in Übereinstimmung mit einem vorbestimmten Drehzahlerhöhungsmodus erhöht wird,
    dadurch gekennzeichnet, dass die Anlaufdrehzahl kleiner oder gleich einer Drehzahl ist, die unter Berücksichtigung einer Belastung der Hauptwellen-Antriebsvorrichtung (60) bestimmt wird, und die so eingestellt ist, dass sie größer oder gleich 25 % der eingestellten Drehzahl ist.
  2. Verfahren zur Antriebssteuerung der Webmaschine nach Anspruch 1, wobei der Drehzahlerhöhungsmodus so bestimmt ist, dass er einen Zustand umfasst, in dem die Hauptwelle (20) für den einen oder die mehreren Zyklen der Webmaschine mit einer oder mehreren Zwischendrehzahlen drehend angetrieben wird, die als Drehzahlen bestimmt werden, die niedriger als die eingestellte Drehzahl und höher als die Anlaufdrehzahl sind.
  3. Verfahren zur Antriebssteuerung der Webmaschine nach Anspruch 2, wobei, wenn der Drehzahlerhöhungsmodus so bestimmt ist, dass er die eine oder mehrere Zwischendrehzahlen umfasst, ein Drehzahlerhöhungsbetrag in Richtung zu der einen oder den mehreren Zwischendrehzahlen an der Webmaschine eingestellt wird, und die Antriebssteuerung des Antriebsmotors (60a) in einem Prozess der Erhöhung der Drehzahl der Hauptwelle (20) von der Anlaufdrehzahl auf die eingestellte Drehzahl auf der Grundlage des Drehzahlerhöhungsbetrags durchgeführt wird.
  4. Verfahren zur Antriebssteuerung der Webmaschine nach Anspruch 2 oder Anspruch 3, wobei eine grundlegende Schusseintragsbedingung, die eine Schusseintragsbedingung für einen Schusseintrag zum Zeitpunkt des stationären Betriebs ist, zuvor an der Webmaschine eingestellt wird und der Schusseintrag zum Zeitpunkt des stationären Betriebs in Übereinstimmung mit der grundlegenden Schusseintragsbedingung durchgeführt wird,
    und wobei in der Anlaufperiode ein Schusseintrag, wenn die Hauptwelle (20) entsprechend der Anlaufdrehzahl drehend angetrieben wird, und ein Schusseintrag, wenn die Hauptwelle (20) entsprechend der einen oder der mehreren Zwischendrehzahlen drehend angetrieben wird, entsprechend Schusseintragsbedingungen durchgeführt werden, die entsprechend den hierzu korrespondierenden Drehzahlen bestimmt werden.
  5. Verfahren zur Antriebssteuerung der Webmaschine nach Anspruch 4, wobei eine Schusseintragsbedingung, wenn die Hauptwelle (20) entsprechend der Anlaufdrehzahl drehend angetrieben wird, und eine Schusseintragsbedingung, wenn die Hauptwelle (20) entsprechend der einen oder der mehreren Zwischendrehzahlen drehend angetrieben wird, durch eine Berechnung bestimmt werden, die auf der grundlegenden Schusseintragsbedingung und den hierzu korrespondierenden Drehzahlen basiert.
  6. Antriebssteuervorrichtung (30) einer Webmaschine, wobei die Antriebssteuervorrichtung (30) den Antrieb eines Antriebsmotors (60a) einer Hauptwellen-Antriebsvorrichtung (60), die eine Hauptwelle (20) antreibt, so steuert, dass die Hauptwelle (20) zu einem Zeitpunkt eines stationären Betriebs in Übereinstimmung mit einer eingestellten Drehzahl, die zuvor eingestellt wurde, drehend angetrieben wird, und einen Betrieb jeder auf den Schusseintrag bezogenen Vorrichtung steuert, die an einem Schusseintrag beteiligt ist, um den Schusseintrag durchzuführen, wobei die Antriebssteuervorrichtung (30) umfasst:
    einen Speicherabschnitt (34a), der eine Anlaufdrehzahl und einen Antriebseinstellwert speichert, wobei die Anlaufdrehzahl auf eine Drehzahl eingestellt ist, die niedriger als die eingestellte Drehzahl ist, wobei der Antriebseinstellwert gemäß einem Drehzahlerhöhungsmodus eingestellt wird, der zum Erhöhen einer Drehzahl der Hauptwelle (20) von der Anlaufdrehzahl auf die eingestellte Drehzahl vorbestimmt wurde,
    wobei der Antrieb des Antriebsmotors (60a) und der Betrieb jeder auf den Schusseintrag bezogenen Vorrichtung so gesteuert werden, dass ein Anlauf der Webmaschine vom Beginn des Anlaufs bis die Drehzahl der Hauptwelle (20) die eingestellte Drehzahl erreicht durchgeführt wird, unter Begleitung eines Schusseintrags in einer Anlaufperiode für einen oder mehrere Zyklen der Webmaschine, und
    wobei die Steuerung des Antriebsmotors (60a) vom Beginn des Anlaufs in Übereinstimmung mit der Anlaufdrehzahl durchgeführt wird, und, wenn und nachdem die Drehzahl der Hauptwelle (20) die Anlaufdrehzahl erreicht hat, die Steuerung des Antriebsmotors (60a) auf der Grundlage des Antriebseinstellwerts ausgeführt wird, so dass die Drehzahl der Hauptwelle (20) von der Anlaufdrehzahl auf die eingestellte Drehzahl in Übereinstimmung mit dem Drehzahlerhöhungsmodus erhöht wird,
    dadurch gekennzeichnet, dass die Anlaufdrehzahl kleiner oder gleich einer Drehzahl ist, die unter Berücksichtigung einer Belastung der Hauptwellen-Antriebsvorrichtung (60) bestimmt wird, und die so eingestellt ist, dass sie größer oder gleich 25% der eingestellten Drehzahl ist.
  7. Antriebssteuervorrichtung (30) der Webmaschine nach Anspruch 6, wobei der Drehzahlerhöhungsmodus so bestimmt ist, dass er einen Zustand umfasst, in dem die Hauptwelle (20) für den einen oder die mehrere Zyklen der Webmaschine mit einer oder mehreren Zwischendrehzahlen drehend angetrieben wird, die als Drehzahlen bestimmt werden, die niedriger als die eingestellte Drehzahl und höher als die Anlaufdrehzahl sind.
  8. Antriebssteuervorrichtung (30) der Webmaschine nach Anspruch 7, wobei, wenn der Drehzahlerhöhungsmodus so bestimmt wird, dass er die eine oder die mehreren Zwischendrehzahlen umfasst, der Antriebseinstellwert so eingestellt ist, dass er einen Drehzahlerhöhungsbetrag in Richtung zu der einen oder den mehreren Zwischendrehzahlen umfasst.
  9. Antriebssteuervorrichtung (30) der Webmaschine nach Anspruch 7 oder Anspruch 8, wobei eine grundlegende Schusseintragsbedingung, die eine Schusseintragsbedingung für einen Schusseintrag zum Zeitpunkt des stationären Betriebs ist, zuvor an der Webmaschine eingestellt wird, und der Schusseintrag zum Zeitpunkt des stationären Betriebs gemäß der grundlegenden Schusseintragsbedingung durchgeführt wird, und
    wobei in der Anlaufperiode ein Schusseintrag, wenn die Hauptwelle (20) entsprechend der Anlaufdrehzahl drehend angetrieben wird, und ein Schusseintrag, wenn die Hauptwelle (20) entsprechend der einen von mehreren Zwischendrehzahlen drehend angetrieben wird, entsprechend Schusseintragsbedingungen durchgeführt werden, die entsprechend den hierzu korrespondierenden Drehzahlen bestimmt werden.
  10. Antriebssteuervorrichtung (30) der Webmaschine nach Anspruch 9, wobei eine Schusseintragsbedingung, wenn die Hauptwelle (20) entsprechend der Anfangsdrehzahl drehend angetrieben wird, und eine Schusseintragsbedingung, wenn die Hauptwelle (20) entsprechend der einen oder der mehreren Zwischendrehzahlen rotierend angetrieben wird, durch eine Berechnung bestimmt werden, die auf der grundlegenden Schusseintragsbedingung und den hierzu korrespondierenden Drehzahlen basiert.
EP19153968.3A 2018-02-21 2019-01-28 Antriebssteuerungsverfahren für webstuhl und antriebssteuerungsvorrichtung für webstuhl Active EP3530788B1 (de)

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