JP2004052149A - Method and apparatus for controlling weaving machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent inconvenience that the length of weft immediately after an operation is changed by the displacement of the angle of a main shaft starting the operation. <P>SOLUTION: The control technology for a weaving machine comprises presetting the angle range of the main shaft for allowing the start of weft sending action by a measurement part for measuring the length of the weft in the angle range of the main shaft for starting a weft storage action by a storage part as an allowable angle range, in an operation input for starting the rotation of the main shaft, starting the rotation of the main shaft without starting the weft sending action and starting the weft sending action when the main shaft reaches the allowable angle range or a fixed time passes from the start of the rotation of the main shaft. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method and an apparatus for controlling a loom having a weft length storage device for measuring and sending out a weft yarn and storing the sent out weft yarn.
[0002]
[Prior art]
As one of the weft length measuring and storing devices of a fluid jet loom, a length measuring unit or a storing unit is driven in synchronization with rotation of a main shaft, and a weft extending from a yarn supply source is measured and sent out by a length measuring unit. There is a technique for storing weft yarns stored in a storage section (Japanese Patent Application Laid-Open No. 63-21955 = Japanese Patent Publication No. 8-30298).
[0003]
In this weft length measuring and storing device, the length measuring unit includes a driving length measuring roller that is driven to rotate and a driven length measuring roller that is driven to rotate by being driven by the driving side length measuring roller. The weft extending from the source is sandwiched between the two measuring rollers and sent out.
[0004]
On the other hand, the storage unit includes a storage drum, a yarn guide that is driven to rotate in accordance with the rotation speed of the length measurement roller and winds a weft sent from the length measurement unit around the outer circumference of the storage drum, and a drive that moves forward and backward with respect to the storage drum. A locking pin for locking and unwinding the weft; and a clamper disposed between the locking pin and the weft insertion nozzle for clamping the weft extending from the storage section so as to be capable of unwinding.
[0005]
In the loom equipped with the weft length measuring and storing device as described above, when it is time to start the storing operation, the storing pin of the weft is started by the advancement of the locking pin. The weft insertion is performed by passing through a free flight process of unwinding the weft restraint by the clamper and pulling out the weft from the storage portion by the weft insertion nozzle, and then a length measurement flight process of pulling out the weft from the length measurement unit. .
[0006]
For this reason, in the loom, the length measuring unit sends out the weft in response to the rotation of the main shaft, whereas the storing unit starts storing when the storage start timing comes. That is, there is a case where the storage unit is not operating even though the length measuring unit is operating.
[0007]
[Problem to be solved]
However, in a state where only the length measuring section operates and the storage section does not operate, looseness of the weft occurs between the length measuring section and the storage section, and the loose wefts become entangled with each other to support the weft insertion. Therefore, it is necessary to start the operation of the loom near the weft storage start angle.
[0008]
The work for the so-called alignment to make the loom an angle suitable for the operation start position, conventionally, after releasing the connection state between the length measuring unit and the main shaft, the main shaft is jogged or reversed, by the method of It was done manually.
[0009]
However, if the loom is jogged or reversed under a fast rotation, the positioning cannot be performed accurately and the stop angle varies. When the operation of the loom is started in such a state, due to the change in the length of the weft inserted into the weft immediately after the start of operation, a weft insertion error or excessive tension acts on the weft. There is an inconvenience that fabric defects occur due to the difference in luster of the weft from that of other wefts.
[0010]
The above-mentioned inconvenience is caused by a device in which the storage unit is driven in synchronization with the rotation of the main shaft of the loom, such as a device described in JP-B-57-44570 and JP-A-49-48956. The same also occurs in a weft length measuring and storing device provided with a storage case in which an airflow is injected into the inside of the section and the weft is blown inside the section, and a clamper disposed between the weft insertion nozzle.
[0011]
Even in a loom equipped with a weft length measuring and storing device as described above, it is unavoidable that the length of the weft inserted immediately after the start of operation is short or long. In order to avoid this, it is necessary to start the operation of the loom near the angle at which the storage of the weft yarn of a length necessary for weft insertion is started.
[0012]
Weft sinking is a defect in which the weft yarn is woven under high tension and the weft yarn becomes abnormally glossy. This is because if more weft yarns are stored immediately after the start of operation (for example, one or more turns in the storage drum) than during normal operation, the so-called constrained flight section during steady-state operation is eliminated, and the flying weft yarns are sufficiently decelerated. It is considered that the locking pin is locked without being performed.
[0013]
An object of the present invention is to prevent the inconvenience that the weft length immediately after the operation of the loom changes due to the deviation of the spindle angle at which the operation of the loom starts.
[0014]
[Solutions, actions, and effects]
[0015]
The control method according to the present invention is directed to a loom including a weft measuring and storing device including a length measuring unit that is driven in synchronization with rotation of a main shaft to measure and feed a weft and a storage unit that stores a fed weft. An angle range of the main shaft that allows the weft sending operation to be started by the length measuring unit is set as an allowable angle range in advance to an angle range of the main shaft that can start the weft storing operation by the storage unit, and the rotation of the main shaft is started. When there is an operation input for starting the rotation of the main shaft without starting the weft feeding operation, a predetermined time has elapsed since the main shaft reached the allowable angle range or the start of the rotation of the main shaft. Starting the weft feeding operation.
[0016]
The control device according to the present invention is a loom including a weft measuring and storing device including a length measuring unit that is driven in synchronization with rotation of the main shaft to measure and send a weft and a storage unit that stores the sent weft. A control circuit for controlling rotation of the spindle, a control circuit receiving an operation signal for starting rotation of the spindle and a rotation angle signal of the spindle, and a control circuit for allowing the weft sending operation to be started by the length measuring unit. Setting means for setting an angle range in advance as an allowable angle range to an angle range of the main shaft capable of starting a weft storing operation by the storage section. The control circuit, when receiving an operation signal for starting rotation of the main shaft, outputs a rotation start signal for starting rotation of the main shaft without starting the weft feeding operation, and the main shaft is controlled in the allowable angle range. Or when a predetermined time has elapsed from the start of rotation of the main shaft, a sending start signal for starting the weft sending operation is output.
[0017]
According to the above-described control method and apparatus, the length measuring section starts the measuring operation of the weft from a preset angle irrespective of the operation start position of the loom, so that the amount of the weft stored in the storing section (weft length). Is maintained at a desired value, and as a result, inconvenience due to a length measurement error, such as a stoppage of a loom due to a weft insertion error due to a show topic or occurrence of a weft sink due to a long pick, is prevented.
[0018]
The length measuring unit may include a pair of weft sending rollers, at least one of which is rotated in synchronization with the rotation of the main shaft.
[0019]
A fixed drum for winding a weft, a yarn guide driven in synchronization with the rotation of the main shaft to wind the weft around the fixed drum, a locking pin capable of moving back and forth with respect to the fixed drum, and a weft. And the operation timing of the locking pin is set to retreat to unwind the weft at the time of weft insertion and after one rotation of the yarn guide before the end of weft insertion. It is preset so that all of the wefts are unwound before the wefts that advance and lock the wefts wound on the fixed drum, and the wefts can be restrained by the locking pins or the clampers. .
[0020]
The allowable angle range may include an angle range of the main shaft in which the yarn guide makes one rotation before the weft insertion ends.
[0021]
The storage unit further includes a storage case that generates an airflow inside and blows out the weft sent out by the length measurement unit by the airflow, and the clamper is disposed between the storage case and the weft insertion nozzle. Arranged to restrain the weft yarn.
[0022]
The loom includes a free flight process of unwinding the restraint of the weft by the storage unit at the time of weft insertion and drawing out the weft through a weft insertion nozzle, and a restraint flight process of pulling out the weft that has passed through the length measuring unit thereafter. It can be a fluid jet loom that includes weft insertion.
[0023]
Another control method according to the present invention is directed to a loom including a length measuring unit that is driven in synchronization with rotation of a main shaft to measure and feed a weft and a storage unit that stores a fed weft and a storage unit that stores a weft. An angle range of the main shaft that allows the start of rotation of the main shaft is set in advance as an allowable angle range to an angle range of the main shaft that can start the weft storing operation by the storage unit, and is used for starting rotation of the main shaft. When there is an operation input, it is determined whether or not the angle of the main shaft is within the allowable angle range, and when the angle of the main shaft is within the allowable angle range, the rotation of the main shaft is started. .
[0024]
Another control device according to the present invention is a loom including a weft measuring and storing device that includes a length measuring unit that is driven in synchronization with the rotation of a main shaft to measure and send a weft and a storage unit that stores the sent weft. A control circuit for controlling rotation of the spindle, a control circuit receiving an operation signal for starting rotation of the spindle and a rotation angle signal of the spindle, and the spindle allowing the control circuit to start rotation of the spindle. Setting means for setting an angle range of the main shaft in which the weft storing operation by the storage section can be started in advance as an allowable angle range. The control circuit, when receiving an operation signal for starting rotation of the spindle, determines whether the angle of the spindle is within the allowable angle range, and determines whether the angle of the spindle is within the allowable angle range. At a certain time, a rotation start signal for starting the rotation of the spindle is output.
[0025]
According to the other control method and apparatus described above, the operation start position of the loom is regulated within the allowable angle range set in advance, so that the amount of weft stored in the storage unit is maintained at a desired value. Inconveniences due to length measurement errors, such as a stoppage of the loom due to a weft insertion error due to a topic and occurrence of a weft sink due to a long pick, are prevented.
[0026]
The length measuring section includes one and the other rollers for weft sending, at least one of which is rotated in synchronization with the rotation of the main shaft, and at least the other roller for changing the contact state of the two rollers with the weft. And an avoiding means for avoiding the situation.
[0027]
BEST MODE FOR CARRYING OUT THE INVENTION
Referring to FIGS. 1 and 2, a weft length measuring and storing device 10 is used in a water jet loom that inserts a weft 14 extending from a yarn feeder 12 into a warp opening together with water jetted from a weft insertion nozzle 16. ing.
[0028]
The weft length measuring and storing device 10 sends out the weft yarn 14 from the yarn feeder 12 while being sandwiched between a pair of length measuring rollers 20 and 22 connected to the main shaft 18 of the loom and rotated in synchronization with the main shaft 18. The length measuring section 23 for measuring the length and the measured weft 14 are wound around the outer peripheral surface of a fixed drum 26 by a yarn guide 24 which is connected to the main shaft 18 and rotated in synchronization with the main shaft 18, and is next locked by a locking pin 28. And a storage unit 29 for storing until weft insertion.
[0029]
The rotation of the main shaft 18 is transmitted to the hollow shaft portion 32 by the pulley 30 connected to the main shaft 18, the pulley 34 assembled to the shaft portion 32 of the yarn guide 24, and the endless belt 36 wound around both pulleys. At the same time, the power is transmitted to one roller 20 by a pulley 38 engaged with the endless belt 36.
[0030]
In the illustrated example, the pulleys 30, 34, and 38 are timing pulleys such as timing gears, and the endless belt 36 is a timing belt. However, a sprocket, a flat pulley, a V pulley, or the like may be used instead of each timing pulley, and a chain, a flat belt, a V belt, or the like may be used instead of the timing belt.
[0031]
One length measuring roller 20 is connected to a pulley 38 that meshes with a belt 36 so as to act as a driving roller that rotates by receiving the rotational force of the main shaft 18. The other length measuring roller 22 is rotatably supported by one end of a lever 40 so as to function as a driven roller that rotates following the rotation of the driving roller 20.
[0032]
The lever 40 is swingably supported about a pivot point or a fulcrum 42 at an intermediate portion in the longitudinal direction. The lever 40 is also driven by an electric actuator 44 such as an electromagnetic solenoid connected to the other end of the driven roller 22 so that the length measuring rollers 20 and 22 can selectively pinch and release the weft 14. 20 is driven so as to be selectively brought into contact with and separated from.
[0033]
The yarn guide 24 is rotatably supported by the support case 46 at the shaft portion 32. The fixed drum 26 is non-rotatably supported by a cover 49 attached to the support case 46. The locking pin 28 is arranged on the outer peripheral surface of the fixed drum 26 to selectively lock and unwind the weft 14 and is selectively advanced and retracted by an electric actuator 48 such as an electromagnetic solenoid.
[0034]
The yarn guide 24 is set in advance so as to be located at the top dead center, which is one of the locking pins 28, when the rotation angle of the main shaft 18 is 270 °. Is set to rotate 5 times per rotation of the loom (spindle 18).
[0035]
On the other hand, the outer diameters of the length measuring rollers 20 and 22 are set so that the weft of one pick is sent out in one rotation of the loom, that is, from the 270 ° weft insertion end timing to 270 ° of the next pick. It is designed to feed one pick weft. The locking pin 28 locks the weft at the weft insertion end timing 270 °. The 270 ° is a timing at which the storage of the weft by the storage unit 29 is started in the illustrated example.
[0036]
Each member of the weft length measuring and storing device 10 is supported on the frame 90 in the state already described, though not shown. The structure of the weft length measuring and storing device 10 is described in Japanese Patent Application Laid-Open No. 2000-336551 and the like, and a detailed description thereof will be omitted.
[0037]
The weft yarn 14 from the yarn supplying body 12 is sandwiched between the rollers 20 and 22 via the first fixed guide 50 and the first clamper 52, and is measured to a length of one pick by the rotation of the rollers 20 and 22. And sent out to the storage unit. The first clamper 52 is for preventing the movement of the weft 14 from the yarn supplying body 12 to the length measuring unit, and is necessary for operation (weaving), threading to the weft length measuring and storing device 10, and the like. At times, it is driven by an electromagnetic solenoid (not shown) so as to release the weft 14.
[0038]
The measured weft yarn 14 reaches the distal end of the yarn guide 24 via the shaft portion 32 of the yarn guide 24, and is rotated by the yarn guide 24 while being locked by the locking pin 28, so that the fixed drum is rotated. It is wound around the circumference of one pick over the length of one pick and stored until the next weft insertion.
[0039]
The weft yarn 14 further extends from the storage section to the weft insertion nozzle 16 via the second fixed guide 54 and the second clamper 56. The second clamper 56 grips the weft 14 on the upstream side of the weft insertion nozzle 16, and is driven in synchronization with the electromagnetic actuator 48 during the weft insertion period to release the grip of the weft 14.
[0040]
During the weaving operation of the loom, the electric actuator 44 drives the lever 40 so as to sandwich the weft 14 between the length measuring rollers 20 and 22, and the electric actuator 48 turns the weft 14 in which the locking pin 28 is stored into the weft 14. The unwinding is performed at the start of the insertion, and the locking pin 28 is driven so as to lock the weft 14 at the end of the insertion.
[0041]
In the initial stage of weft insertion, the weft stored in the storage unit 29 is drawn into the warp opening while being pulled out by the weft insertion nozzle 16. As a result, the weft is free to fly from the beginning to the middle of the weft insertion period.
[0042]
The weft 14 extending from the yarn supplying body 12 is measured by being pinched by the length measuring rollers 20 and 22 even during weft insertion. As a result, the flight of the weft yarn 14 is a so-called restrained flight in which the flight of the weft 14 is restrained by the length measuring rollers 20 and 22 in the latter half of the flight, particularly in the final period.
[0043]
When a loom stop signal for stopping the loom due to the occurrence of a stoppage cause such as a weft insertion error or a thread break is generated, the loom is stopped after coasting rotation, and then the loom is reversed or jogged based on the operation input. Thus, a process for eliminating or restoring the cause of the stoppage is performed.
[0044]
The process of repairing the cause of the stoppage differs depending on the cause of the stoppage. For example, if the cause of the stop is a weft insertion error, the removal of the mistaken weft, the cutting of the warp, connection of the warp, and the breakage of the warp or the weft, the replenishment of the consumed yarn.
[0045]
When the loom stop signal is generated, the electric actuator 44 separates the driven roller 22 from the driving roller 20, the electric actuator 48 retracts the locking pin 28 from the fixed drum 28, and the electric actuator 56 56 causes the weft 14 to be gripped.
[0046]
In the above state, a process of repairing the cause of the stop is performed. The cause of the standstill is eliminated while the operator manually operates a predetermined operation button to reverse or jog the loom.
[0047]
When the cause of the standstill is eliminated, an operation preparation process for restarting the operation of the loom is performed, and thereafter, the operation of the loom is restarted when the operation button is pressed and an operation command is issued.
[0048]
The operation preparation process is a process of stopping the length measuring function of the length measuring unit 23 for a predetermined period after an operation command is issued by the operation button, or rotating the main shaft 18 to an angle range in which the rotation of the main shaft 18 is allowed to start. Including processing. When the main shaft 18 is rotated to an angle range allowing the start of rotation, the yarn guide 24 is positioned near the top dead center.
[0049]
The period during which the length measuring function is stopped by the length measuring unit 23 is set in advance to an angle range (270 ° and its vicinity) in which rotation of the main shaft 18 is allowed as an allowable angle range in which the weft storing operation by the storing unit 23 can be started. be able to. The angle range in which the rotation of the main shaft 18 can be started can be set in advance as an angle range of 270 ° at which the weft storing operation in the storage unit 23 can be started and an allowable angle range around the angle range.
[0050]
Alternatively, as another method, when there is an operation input for starting the rotation of the main shaft 18, if the rotation angle of the main shaft 18 is within the allowable angle range described above, the loom performs the weft length measurement operation by the length measuring unit 23. Allow or start the rotation of the main shaft 18 to resume operation.
[0051]
The control of the weft length measuring and storing device 10 as described above is performed by the control device 60 shown in FIG.
[0052]
Referring to FIG. 3, control device 60 receives an output signal of angle detector 62 that detects a rotation angle of main shaft 18 and generates a corresponding angle signal θ in control circuit 64 and is set in setting device 66. The control circuit 64 receives the various types of information.
[0053]
In the timing setter 66, the timing at which the electromagnetic actuators 48 and 58 and the on-off valve for the pressure water for weft insertion are turned on is set in advance in consideration of the weft insertion period. For example, when beating is 0 °, the timing for driving the electromagnetic actuators 48 and 58 and the on-off valve may be between 70 ° to 270 ° and 100 ° to 280 ° and 50 ° to 200 °, respectively. it can.
[0054]
When the electromagnetic actuator 48 is turned on, the locking pin 28 retreats from the fixed drum 24 and unwinds the stored weft yarn 14. When the electromagnetic actuator 58 is turned on, the second clamper 56 releases the weft 14 extending to the weft inlet nozzle 16. When the on-off valve is turned on, the weft insertion pressure water is ejected from the weft insertion nozzle 16 together with the weft. Instead of the electromagnetically driven on-off valve, pressure water may be injected by a mechanically driven pump connected to the main shaft.
[0055]
In the timing setting device 66, an allowable angle range (or an allowable angle range in which rotation of the main shaft is permitted) is set at a timing of turning on the length measuring function after the operation is restarted. This allowable angle range is set to an allowable angle at which the rotation of the main shaft 18 is allowed to start (or an allowable angle at which the length measuring unit 23 is allowed to start the weft length measuring operation) of 270 °.
[0056]
Each time the angle signal θ from the angle detector 62 reaches the value set in the setting unit 66, the control circuit 64 sends a signal for turning on or off the corresponding electromagnetic actuator to the drive circuit of the corresponding electromagnetic actuator. Output.
[0057]
The control circuit 64 includes an operation button 70 for starting the loom, a connection unwinding button 72 for releasing the connection between the main shaft 18 and the length measuring rollers 20 and 22, and a connection button 74 for connecting the main shaft 18 and the length measuring rollers 20 and 22. A plurality of operation buttons for manually inputting various commands, such as a stop button for stopping the loom, a jog button for jogging the loom, and a reverse button for reversing the loom.
[0058]
The control circuit 64 shows various signals for operating the loom or stopping the loom in accordance with various data set in advance in the setting device 62, such as weaving parameters, in addition to a loom stop signal and a push button command. It outputs to a warp sending device, a woven fabric take-up control device, a spindle control device, a weft insertion device, an opening device, etc. Thereby, each mechanical device of the loom is in the operation preparation state, the operation state (weaving state) or the stopped state.
[0059]
With reference to FIGS. 4 and 5, an embodiment in which a loom provided with the weft length measuring and storing device 10 is controlled by the control device 60 will be described.
[0060]
FIG. 4 shows that when there is an operation input (input of an operation command) for starting rotation of the main shaft 18, the weft measuring operation by the length measuring unit 23 is performed until the rotation angle of the main shaft 18 reaches the allowable angle range 270 °. Here is an example of prohibition. In this embodiment, 270 ° is set in the setting unit 66 in FIG. 3 as an allowable angle range in which the weft measuring operation by the length measuring unit 23 is started.
[0061]
In FIG. 4, (A) shows the position of the leading end of the weft, (B) shows the amount of rotation (measured length) of the yarn guide, (C) shows the operation timing of the locking pin, and (D) shows the operation timing of the second clamper 58. , (E) show the injection timing of the weft insertion pressure water, respectively.
[0062]
During operation of the loom, the control circuit 64 drives the length measuring section 23 so that the weft 14 is always sent out by bringing the rollers 20 and 22 into contact with each other, and the locking pin 28 and the second clamper 56 The storage section 29 is driven so that the weft sent out by being turned on / off at the timing of (2) is wound around the drum 26 at a predetermined timing and stored, and further, weft insertion is performed at a predetermined timing.
[0063]
Thus, the remaining amount of the weft stored in the drum 26 changes as shown by the solid line in FIG. In FIG. 4 (B), the weft is wefted from 100 ° to 270 °, but most of the weft insertion period (until the remaining weft on the drum 26 is drawn out) is free-wefted, At the end of the weft insertion period (the residual weft remaining on the drum 26 is zero), the weft is inserted by the bounding flight constrained by the length measuring unit 23 to 270 °. Then, the weft starts to be stored in the drum 26 from 270 °.
[0064]
When a stoppage cause occurs, the control circuit 64 stops the loom. When the loom stops, the operator operates a predetermined operation button, and the control circuit 64 causes the loom (actually, the main shaft 18) to reversely rotate or jog. This allows the operator to repair the cause of the stop.
[0065]
At the time of this repairing operation, the control circuit 64 turns on the electromagnetic actuator 44 to separate the length measuring function from the rotation of the main shaft 18, depending on the stop angle of the loom (main shaft 18). As a result, since the weft 14 extending from the yarn supplying body 12 is not gripped by the length measuring rollers 20 and 22, even if the inching button or the reverse rotation button is operated and the loom is rotated forward or backward, the rollers 20 and 22 are rotated. The weft length measuring function and the weft pulling back function due to the above are prevented.
[0066]
When the operation button 70 is operated after the cause of the stoppage is resolved by the operator, an operation command is input to the control circuit 64. Thereby, the control circuit 64 starts the operation of the loom.
[0067]
The control circuit 64 turns on the electromagnetic actuator 44 until the rotation angle of the main shaft 18 falls within the permissible angle range from 240 ° to 270 °, although it depends on the stop angle of the loom when the operation is resumed. Is stopped, the electromagnetic actuator 48 is turned on to unwind the weft from 70 ° to 270 °, and the electromagnetic actuator 58 is turned on from 100 ° to 280 ° to turn on the second clamper. Release the weft to 56.
[0068]
When the rotation angle of the main shaft 18 reaches the angle range of 240 ° to 270 °, the control circuit 64 starts the length measurement of the weft by the length measuring unit 23 and locks the measured weft to the locking pin 28. Then, weft storage is started.
[0069]
When the rotation angle of the main shaft 18 reaches 280 °, the control circuit 64 makes the second clamper 56 hold the weft.
[0070]
As described above, regardless of the operation start position of the loom, if the length measuring unit 23 starts the weft length measuring operation from the preset allowable angle range of 240 ° to 270 °, it is stored in the storing unit 29. The amount of the weft is maintained at a desired value, and as a result, inconvenience due to a length measurement error such as a stoppage of the loom due to a weft insertion error due to a show topic and occurrence of a weft sink due to a long pick is prevented.
[0071]
In the above embodiment, since the length measuring section 23 starts the weft length measuring operation from the preset angle of 270 °, the operation of the loom can be performed at any time if the rotation angle of the main shaft 18 at the time of restarting the operation is before 270 °. Can be started.
[0072]
Next, referring to FIG. 5, in the weft length measuring storage device 10 and the control device 60 shown in FIGS. 1 to 3, when the operation command is input to the control circuit 64, the rotation angle of the main shaft 18 is set to the allowable angle range 270 °. An example in which the rotation of the main shaft 18 is prohibited when the rotation speed has not been reached will be described. In this embodiment, 240 ° to 270 ° is set in the setting unit 66 in FIG. 3 as an allowable angle range in which the rotation of the main shaft 18 is allowed.
[0073]
In FIG. 5, (A) is the position of the leading end of the weft, (B) is the amount of rotation (measuring length) of the yarn guide, (C) is the operation timing of the locking pin, and (D) is the operation timing of the second clamper 58. , (E) shows the injection timing of the weft insertion pressure water, (F) shows the rotation state of the loom, and (G) shows the allowable angle range.
[0074]
During operation of the loom, the control circuit 64 drives the storage section 23 so that the weft yarn 14 is constantly fed by the rollers 20 and 22, and the locking pin 28 and the second clamper 56 are turned on / off at a predetermined timing. Then, the storage unit 29 is driven so that the weft sent out is wound around the drum 26 at a predetermined timing and stored, and further, weft insertion is performed at a predetermined timing.
[0075]
Thus, the remaining amount of the weft stored in the drum 26 changes as shown in FIG. In FIG. 4 (B), the weft is wefted from 100 ° to 270 °, but most of the weft insertion period (until the remaining weft on the drum 26 is drawn out) is free-wefted, At the end of the weft insertion period (the residual weft remaining on the drum 26 is zero), the weft is inserted by the bounding flight constrained by the length measuring unit 23 to 270 °. Then, the weft starts to be stored in the drum 26 from 270 °.
[0076]
When a stoppage cause occurs, the control circuit 64 brakes the loom to stop the loom. Thereby, the loom (main shaft 18) stops after the coasting rotation due to the inertial force.
[0077]
When the loom stops, the control circuit 64 operates the predetermined operation button to cause the operator to perform a repair operation to reverse or jog the loom to repair the cause of the stand.
[0078]
During this repairing operation, the loom is reversed to the vicinity of the weft insertion start angle of the stopped weft insertion cycle to remove the weft yarn, thereby restoring the cause of the stop. Next, it is further reversed from the allowable angle range of 240 ° to 270 °.
[0079]
The control circuit 64 turns on the electromagnetic actuator 44 to disconnect the length measurement function from the rotation of the main shaft 18 at the time of repairing the cause of the stoppage, depending on the stop angle of the loom, depending on the stop angle of the loom. As a result, since the weft 14 extending from the yarn supplying body 12 is not gripped by the length measuring rollers 20 and 22, even if the inching button or the reverse rotation button is operated and the loom is rotated forward or backward, the rollers 20 and 22 are rotated. The weft length measuring function and the weft pulling back function due to the above are prevented.
[0080]
When the operation button 70 is operated, an operation command is input to the control circuit 64. Thereby, the control circuit 64 allows the operation command and starts the operation of the loom when the rotation angle of the main shaft is within the allowable angle range of 240 ° to 270 °.
[0081]
Further, the control circuit 64 immediately turns off the electromagnetic actuator 44 to restart the length measuring function of the length measuring unit 23, and then turns on the electromagnetic actuator 48 from 70 ° to 270 ° as during normal operation. Then, from 100 ° to 280 °, the electromagnetic actuator 58 is turned on to release the weft by the second clamper 56, and the weft is placed on the jet water and inserted into the warp opening.
[0082]
Then, when the rotation angle of the main shaft 18 reaches the range of 240 ° to 270 °, the control circuit 64 locks the measured weft on the locking pin 28 and starts storing the weft.
[0083]
When the rotation angle of the main shaft 18 reaches 280 °, the control circuit 64 makes the second clamper 56 hold the weft.
[0084]
As described above, if the operation start position of the loom is regulated within the preset allowable angle range, the amount of weft stored in the storage unit is maintained at a desired value, and as a result, weft insertion errors due to show topics This prevents inconvenience due to length measurement errors such as stoppage of the loom due to the above-mentioned reason, occurrence of weeping due to a long pick, and the like.
[0085]
The embodiment shown in FIG. 5 can be implemented by providing the loom with the operation inhibition circuit 80 shown in FIG.
[0086]
The operation inhibiting circuit 80 includes a setter 82 in which 240 ° to 270 ° is set as an allowable angle range in which the rotation of the main shaft 18 is allowed, and an angle signal θ input from the angle detector 62 sets the angle set in the setter 82. A timing signal generator 84 that outputs a timing signal indicating that the signal has reached the range, and an AND circuit 86 that outputs an AND signal between the timing signal and the operation command by the operation button 70 as a driving operation signal. Have been.
[0087]
The operation signal output from the AND circuit 86 is supplied to the main control unit 88 of the loom and used as a signal for starting the operation of the loom.
[0088]
Even when the operation prevention circuit 80 is used, since the operation start position of the loom is regulated within a predetermined allowable angle range, the amount of weft stored in the storage unit is maintained at a desired value, and as a result, the weft by the show topic Inconveniences due to length measurement errors such as stoppage of the loom due to misinsertion and occurrence of weeding due to a long pick are prevented.
[0089]
In the embodiment shown in FIG. 6, the operation command from the operation button 70 is blocked by the timing signal. However, the operation button 70 is mechanically locked and the signal The operation button 70 may not be generated, or the operation button 70 may be disabled by covering the front surface of the operation button 70 with a plate material via an electromagnetic actuator or the like (not shown).
[0090]
Referring to FIGS. 7 and 8, the weft length measuring and storing device 110 uses a rotating drum type storage unit 111 instead of the fixed drum type storage unit 29.
[0091]
The rotary drum type storage unit includes a rotary drum 112 rotatably mounted on the loom, a cover 114 surrounding the rotary drum 112, and an annular flow path between the outer circumference of the rotary drum 112 and the inner circumference of the cover 114. And an airflow generator 118 such as a blower that blows air into 118.
[0092]
The rotating drum 112 is mounted on a shaft 120 rotated by the main shaft of the loom, and is therefore rotated together with the main shaft. The cover 114 and the airflow generator 116 are supported on the frame of the loom.
[0093]
The drive roller 20 is in contact with the outer peripheral surface of the rotary drum 112, is rotated by the rotation of the rotary drum 112, and measures the length of the weft 14 in cooperation with the driven roller 22. The driven roller 22 is rotatably supported at a tip end of a support arm 122 advanced and retracted by an electric actuator 44, and is moved toward and away from the drive roller 20 by the electric actuator 44.
[0094]
The rotary drum type storage unit generates a swirling airflow swirling in the same direction as the rotating drum 112 in an annular passage 116 between the rotating drum 112 and the cover 114 by an airflow generator 116, and the weft 14 is rotated by the annular airflow. It is stored along the outer peripheral surface of the drum 112.
[0095]
The stored weft yarn 14 is drawn out through the opening 124 of the cover 114 by ejecting the leading end side together with the fluid from the weft inlet nozzle 16. The second clamper 56 holds the weft 14 while storing the weft 14 and releases the weft 14 during weft insertion.
[0096]
The structure of the weft length storage device 110 using the rotary drum type storage unit is also described in Japanese Patent Application Laid-Open No. 2000-336551, and the detailed description is omitted.
[0097]
In the weft length measuring and storing device 110, similarly to the embodiment described above, an allowable angle range allowing the start of the operation of the loom or an allowable angle range allowing the start of the length measurement of the weft is set, and based on such an allowable angle range. The operation start or the length measurement start is controlled.
[0098]
Also in the weft length measuring and storing device 110, when the loom is stopped, before the loom is jogged or reversed, the rotating drum 112 and the driving roller 20 are kept operable, and the driven roller 22 is separated from the driving roller 22. Accordingly, the weft length measuring and storing device 110 is set in a state where the weft 14 is not measured or stored.
[0099]
In any of the above embodiments, the allowable angle range allowing the start of the weft length measurement or the allowable angle range allowing the start of the operation is set at the end of 270 °, and the start is before the end and does not support the weft insertion. Angle can be set.
[0100]
Therefore, the beginning of the allowable angle range does not need to be 240 °, and can be, for example, 1/2 turn or 1/3 turn before the stop position (270 °) of the yarn guide, or 1 / turn. It is more preferable to be four turns before. However, the narrower the allowable angle range, the smaller the variation in the weft length immediately after the start of operation, which is preferable, but the more difficult it is to adjust the rotation angle for operation.
[0101]
At the beginning of the allowable angle range, the closer to the start timing of the weft storage in the storage unit 29, the more accurate the weft storage amount. However, if the start of the allowable angle range is close to the start timing of the weft storage, the allowable angle range itself becomes narrow, and it becomes difficult to perform positioning. Therefore, the beginning of the allowable angle range is preferably set to the above timing at which the alignment is not difficult, for example, about 240 °.
[0102]
When the operation start angle or the length measurement start angle is set to 175 ° as shown by the two-dot line in FIG. 5, one turn of weft remains on the drum at the end of weft insertion immediately after the start of operation. Since there is no longer the length measurement flight period, that is, the restraint flight period, weeping occurs, and this condition continues for a long time thereafter, and the quality of the fabric is significantly reduced.
[0103]
On the other hand, when the operation start angle or the length measurement start angle is in the range of 240 ° to 270 °, the amount of yarn remaining on the drum at the end of weft insertion becomes zero, and the above-described inconvenience does not occur.
[0104]
In any of the above embodiments, the timing at which the length measuring section 23 starts the weft length measuring operation or the timing at which the rotation of the main shaft is allowed to start at the start of operation is determined not only by the rotation angle of the main shaft 18 but also by the elapsed time from a predetermined reference angle It may be. In addition, as long as there is no problem in the quality of the woven fabric or the weft insertion, the timing at which the length measuring unit 23 starts the weft measuring operation or the timing at which the main shaft is rotated at the start of the operation is based on the angle 270 ° at which the operation of the loom is started. It may be the previous stage. Therefore, the timing at which the length measuring unit 23 starts the weft measuring operation or the timing at which the main shaft is allowed to rotate at the start of the operation may have a predetermined angle range or time range (time width).
[0105]
When operating the operation button, it is preferable to notify by a display means such as an indicator light or an alarm means such as a buzzer that the angle of the main shaft is out of the allowable angle range and the start of operation is prevented.
[0106]
The switching of the contact state in the length measuring section is not limited to the contact / separation of the driven-side length measuring roller 22 with respect to the driving-side length measuring roller 20 as in the above-described embodiment, and the weft is inserted between the two rollers 20 and 22 by the arm. It may be performed by other techniques or means, such as by detaching.
[0107]
Instead of a loom using a length measuring and storage device connected to and driven by the main shaft 18, a type of length measuring and storing device using a dedicated electric actuator such as a motor driven in synchronization with the rotation of the main shaft 18 was used. The present invention may be applied to a loom.
[0108]
In the case of a storage unit using an air flow, instead of using a device of a type that stores a weft using a rotating drum and a swirling flow as in the embodiment shown in FIGS. 7 and 8, Japanese Patent Application Laid-Open No. 49-48956 discloses As described, an apparatus of a type that stores the weft yarn using a linear airflow and a linear storage means may be used.
[0109]
In the above-described apparatus shown in FIG. 1 or FIG. 7, when the control for restricting the angle of the loom at which the operation is started is restricted to a predetermined angle range, an electromagnetic solenoid 44 is provided to separate the roller 22 from the roller 20. However, the roller 22 may be manually separated from the roller 20 as appropriate.
[0110]
The present invention can be applied not only to a single-color weft insertion loom but also to a multi-color weft insertion loom. The present invention can be applied not only to a water jet loom but also to an air jet loom. Further, the present invention can be applied not only to a single-color weft insertion loom but also to a multi-color weft insertion loom. When the present invention is applied to a multicolor weft insertion loom, a weft length measuring and storing device is provided for each yarn type.
[0111]
The present invention is not limited to the above embodiments, and can be variously modified without departing from the gist thereof.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a weft length storage device controlled by a control device according to the present invention.
FIG. 2 is a perspective view showing one embodiment of a storage section in the length measuring and storing apparatus shown in FIG.
FIG. 3 is a block diagram of an electric circuit showing one embodiment of a control device according to the present invention.
4 is a diagram for explaining an operation state of a loom by a control device shown in FIG. 2;
FIG. 5 is a diagram for explaining another operation state of the loom by the control device shown in FIG. 2;
FIG. 6 is a block diagram of an electric circuit showing another embodiment of the control device according to the present invention.
FIG. 7 is a partially broken front view showing another embodiment of the weft length measuring and storing device.
FIG. 8 is a longitudinal sectional view of the storage section shown in FIG.
[Explanation of symbols]
10,110 Weft length storage device
12 Yarn feeder
14 weft
16 Weft insertion nozzle
18 spindle
20 Drive roller (length measuring roller)
22 Follower roller (length measuring roller)
23 Measurement section
24 Yarn guide
26 fixed drum
28 Locking pin
29,111 Reservoir
30, 34, 38 Pulley
32 Shaft
36 Endless belt
40 support arm
42 Supporting point of support arm
44,48,58 Electric actuator
46 cases
50,54 Yarn guide
52,56 Clamper
60 control device
62 Angle detector
112 rotating drum
114 cover
116 Annular flow path
118 Airflow generator
120 Shaft
122 support arm
124 opening

Claims (10)

A method for controlling a loom comprising a length measuring unit driven and synchronized with rotation of a main shaft of a loom to measure and send a weft and a storage unit for storing a sent out weft, comprising a weft measuring and storing device. The angle range of the main shaft that allows the weft to be started by the long portion is set as an allowable angle range in advance to the angle range of the main shaft where the weft storage operation by the storage unit can be started, and the rotation of the main shaft is started. When there is an operation input for starting the rotation of the main shaft without starting the weft sending operation, when the main shaft has reached the allowable angle range or a predetermined time has elapsed from the start of rotation of the main shaft. A method of controlling a loom, comprising: starting the weft feeding operation. A method for controlling a loom comprising a weft measuring and storage device including a length measuring unit driven to measure and send out a weft while being driven in synchronization with rotation of a main shaft of a weaving machine, and a storage unit for storing a sent out weft, wherein the main shaft comprises: An angle range of the main shaft that allows the rotation start of the main shaft is set in advance as an allowable angle range to an angle range of the main shaft that can start the weft storing operation by the storage unit, and an operation input for starting rotation of the main shaft is performed. Determining whether the angle of the main shaft is within the allowable angle range, and starting rotation of the main shaft when the angle of the main shaft is within the allowable angle range. Control method. 3. The method according to claim 1, wherein the length measuring unit includes a pair of weft feeding rollers, at least one of which is rotated in synchronization with the rotation of the main shaft. 4. A fixed drum for winding a weft, a yarn guide driven in synchronization with the rotation of the main shaft to wind the weft around the fixed drum, a locking pin capable of moving back and forth with respect to the fixed drum, and a weft. And the operation timing of the locking pin is set to retreat to unwind the weft at the time of weft insertion and after one rotation of the yarn guide before the end of weft insertion. It is set in advance so that all of the weft yarns are unwound before being advanced and locking the weft wound around the fixed drum, and the weft yarn is restrained by the locking pin or the clamper. The method according to any one of claims 1 to 3. The method according to claim 4, wherein the allowable angle range includes an angle range of the main shaft in which the yarn guide is rotated once before the end of the weft insertion. The storage unit further includes a storage case that generates an airflow inside and blows out the weft sent out by the length measurement unit by the airflow, and the clamper is disposed between the storage case and the weft insertion nozzle. 6. The method of claim 5, wherein the method is disposed and restrains the weft. The loom includes a free flight process of unwinding the weft restraint by the storage unit at the time of weft insertion and pulling out the weft via a weft insertion nozzle, and a restraint flight process of subsequently pulling out the weft passing through the length measuring unit. The method according to any one of claims 1 to 6, wherein the method is a fluid jet loom, which includes wefting through. In a control device for a weaving machine having a weft measuring and storing device including a length measuring unit driven to measure and send out a weft while being driven in synchronization with rotation of a main shaft of a loom and a storage unit for storing a sent out weft, the rotation of the main shaft is controlled. A control circuit that receives an operation signal for starting rotation of the spindle and a rotation angle signal of the spindle, and an angle range of the spindle that permits the start of a weft sending operation by the length measuring unit. Setting means that is set in advance as an allowable angle range in the angle range of the main shaft capable of starting the weft storing operation by the storage unit, wherein the control circuit receives an operation signal for starting rotation of the main shaft. Outputting a rotation start signal for starting rotation of the spindle without starting the weft feeding operation, and when the spindle reaches the allowable angle range or after a predetermined time from the start of rotation of the spindle. And it outputs a transmission start signal for starting the weft delivery operation when the loom control device. In a control device for a weaving machine having a weft measuring and storing device including a length measuring unit driven to measure and send out a weft while being driven in synchronization with rotation of a main shaft of a loom and a storage unit for storing a sent out weft, the rotation of the main shaft is controlled. A control circuit that receives an operation signal for starting rotation of the spindle and a rotation angle signal of the spindle, and an angle range of the spindle that allows the spindle to start rotating by the control circuit. Setting means which is set in advance as an allowable angle range in the angle range of the main shaft capable of starting the weft storing operation by the storage unit, the control circuit receives an operation signal for starting rotation of the main shaft, Determining whether the angle of the main shaft is within the allowable angle range and outputting a rotation start signal for starting rotation of the main shaft when the angle of the main shaft is within the allowable angle range; Control device. The length measuring section includes one and the other rollers for weft sending, at least one of which is rotated in synchronization with the rotation of the main shaft, and at least the other roller for changing the contact state of the two rollers with the weft. The device according to claim 8, further comprising: an avoiding unit configured to avoid the situation.

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