JP3584568B2 - Weaving abnormality detection control method and apparatus in loom - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a weaving abnormality detection control method and apparatus in a loom provided with a weaving abnormality detection unit that detects an abnormality in weaving and outputs a weaving abnormality detection signal.
[0002]
[Prior art]
Generally, a loom is provided with a warp cut detection device for detecting a warp breakage. In this type of detection device, a dropper suspended and supported by a warp drops as the warp is cut, and an electric signal is output in accordance with the drop. The output of the electric signal indicates that the warp is broken. However, when a new warp beam is mounted on the loom after the warp in the warp beam has been consumed and a new weaving operation is started, the tensions of the individual warp yarns are often not uniform. If the tension of the warp is weak, the dropper falls even though the thread is not broken, and an electric signal is output. When an electric signal indicating the detection of a yarn break is output, weaving is immediately stopped. Therefore, as disclosed in Japanese Patent Application Laid-Open No. 57-176243, at the start of new weaving, a measure is taken to cut off the signal cable connected to the warp cut detection device.
[0003]
[Problems to be solved by the invention]
The disconnection on the signal cable is performed by disconnecting the connector, and the connector is connected after weaving has progressed to such an extent that the tensions of the individual warps become uniform. However, in the work of disconnecting and connecting such a connector, an operator must be on the loom side during this time, which is troublesome and time-consuming.
[0004]
In addition, the jet loom is equipped with a weft detector that detects whether or not the inserted weft has arrived.However, when the start of a new weaving operation, the inserted weft is caught on the warp due to insufficient warp tension. Easy to make mistakes. Therefore, a measure is taken to cut off the signal cable connected to the weft detector, but this work is also troublesome.
[0005]
SUMMARY OF THE INVENTION It is an object of the present invention to improve the workability of an operation for invalidating a detection function of a weaving abnormality detection unit such as a warp cut detection device and a weft detector.
[0006]
[Means for Solving the Problems]
Therefore, the present invention is directed to a weaving machine having a weaving abnormality detecting means for detecting a weaving abnormality and outputting a weaving abnormality detection signal. After disabling the function of the detection means, the function is automatically enabled after a predetermined weaving progress, and the function of the weaving abnormality detection means is enabled when the weaving is resumed after the subsequent stop of the weaving. The function of the abnormality detection means is disabled and enabled by disabling and enabling the weaving abnormality detection signal, and the weaving abnormality detection means detects the arrival of the weft inserted weft in the jet loom. In a state where the weaving abnormality detection signal is invalidated, the weaving is stopped when the weft detector outputs two consecutive detection signals .
[0007]
In the invention of claim 2, after the function of the weaving abnormality detecting means is disabled, weaving is started by turning on a start switch, and the function is automatically enabled after a predetermined weaving progress.
[0011]
According to the first aspect of the present invention, in the invalidation mode in which the function of the weaving abnormality detection unit is invalidated, the weaving does not stop due to the occurrence of the weaving abnormality which is the detection target of the weaving abnormality detection unit. When the weaving progress amount after the invalidation mode reaches a predetermined weaving progress amount, the invalidation mode is automatically canceled, and the function of the weaving abnormality detecting means is activated. After the activation mode, the weaving is stopped due to the occurrence of a weaving abnormality which is a detection target of the weaving abnormality detecting means. Disabling the function of the weaving abnormality detection means includes invalidating the output weaving abnormality detection signal, disabling the output function of the weaving abnormality detection signal, and stopping power supply to the weaving abnormality detection means. Further, the function of the weaving abnormality detection unit is invalidated by invalidating the weaving abnormality detection signal output from the weaving abnormality detection unit. When the weft detector, which is one type of the weaving abnormality detection means, outputs two consecutive weaving abnormality detection signals, the weaving is stopped regardless of the invalidation mode. The case where the weaving abnormality detection signal is output twice in succession is, for example, a yarn feeding error on the yarn feeding path from the weft cheese to the weft insertion main nozzle.
[0012]
According to the second aspect of the present invention, the invalidation mode is entered before the ON operation of the start switch, and when the weaving progress after the start of weaving reaches a predetermined weaving progress, the invalidation mode is automatically canceled. .
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
[0016]
FIG. 1 schematically shows a side view of the entire loom. M is a loom drive motor, and the loom drive motor M is controlled by the loom control computer C1. Reference numeral 11 denotes a feed motor which can be rotated forward and backward independently of the loom drive motor M. The feed motor 11 drives the warp beam 12. The warp T sent out from the warp beam 12 passes through a heald 15 and a reed 16 via a back roller 13 and a tension roller 14. The woven fabric W is wound around the cross roller 21 via the expansion bar 17, the surface roller 18, the press roller 19, and the wrinkle guide member 20.
[0017]
The tension roller 14 is attached to one end of a tension lever 22, and a predetermined tension is applied to the warp T by a tension spring 23 attached to the other end of the tension lever 22. The tension lever 22 is rotatably supported at one end of the detection lever 24, and a load cell 25 is connected to the other end of the detection lever 24. The warp tension is transmitted to the load cell 25 via the tension roller 14, the tension lever 22, and the detection lever 24, and the load cell 25 outputs an electric signal corresponding to the warp tension to the loom control computer C1.
[0018]
The loom control computer C1 compares the tension set in advance with the detected tension grasped by the input signal and sends out the warp beam based on the warp beam diameter grasped by the detection signal from the rotary encoder 26 for detecting the rotation angle of the machine. The rotation speed of the motor 11 is controlled. By controlling the rotation speed, the warp tension during the normal operation is controlled to prevent the weaving step from occurring during weaving.
[0019]
The loom control computer C1 instructs the forward rotation operation of the delivery motor 11 by an ON signal from the start switch 27, and changes the rotation speed of the delivery motor 11 based on a rotation speed detection signal from a rotary encoder 111 incorporated in the delivery motor 11. Perform feedback control.
[0020]
A warp cut detecting device 28 is provided on the warp path after the tension roller 14. The warp cut detecting device 28 detects the cut of the warp T. When the warp T is cut, the dropper 281 falls, and the drop causes the warp cut detection device 28 to output a warp cut detection signal serving as a weaving abnormality detection signal to the weaving abnormality detection control device C2.
[0021]
The weaving abnormality detection control device C2 includes a disabling circuit 29 connected to the loom control computer C1 and the warp cut detection device 28, a canceling circuit 30 connected to the rotary encoder 26 and the disabling circuit 29, and a disabling circuit. An invalidation switch 31 and an activation switch 32 are connected to the signal 29. A predetermined number of weft insertions No is input and set by the input device 33 to the canceling circuit 30 serving as a canceling means. The rotary encoder 26 outputs an origin signal to the canceling circuit 30 every time weft insertion is performed, and the canceling circuit 30 compares the input number Nx of the origin signal representing the number of weft insertions with a predetermined number of weft insertions No. When the detected number of weft insertions Nx reaches a predetermined number of weft insertions No, the canceling circuit 30 outputs a canceling signal to the invalidating circuit 29 serving as invalidating means. The invalidation switch 31 and the activation switch 32 constitute a selection switch circuit.
[0022]
FIG. 2 is a flowchart showing a weaving abnormality detection control program by the loom control computer C1 and the weaving abnormality detection control device C2. At the start of new weaving after the replacement of the warp beam 12, the invalidation switch 31 is turned ON. The invalidation circuit 29 selects the invalidation mode in response to the output of the invalidation signal accompanying the ON operation of the invalidation switch 31. When the start switch 27 is turned on after selecting the invalidation mode, the loom control computer C1 instructs the start of weaving. When the number of detected weft insertions Nx after the start of weaving reaches the set number of weft insertions No, the cancellation circuit 30 outputs a cancellation signal to the invalidation circuit 29. The invalidation circuit 29 shifts from the invalidation mode to the activation mode in response to the input of the cancellation signal.
[0023]
When a warp break occurs, the warp cut detection device 28 outputs a warp cut detection signal to the invalidation circuit 29. When the invalidation circuit 29 is in the activation mode, the invalidation circuit 29 outputs a weaving stop signal to the loom control computer C1 in response to the input of the warp cut detection signal. The loom control computer C1 instructs weaving stop in response to the input of the weaving stop signal. When the invalidation circuit 29 is in the invalidation mode, the invalidation circuit 29 invalidates the input warp cut detection signal and does not output the weaving stop signal.
[0024]
Immediately after the replacement of the warp beam 12, the tensions of the individual warps T are often not uniform, and the dropper 281 suspended on the warp T having too low tension is in the same falling state as in the case of the yarn breakage. If warp cut detection is performed in such a state, unnecessary stoppage of weaving occurs. In this embodiment, the warp cut detection signal output is invalidated while the number of weft insertions Nx after the new warp beam exchange does not reach the set number of weft insertions No. The set number of weft insertions No is about the number of times of weft insertion during the weaving state until the tension of the individual warps T is equalized, and weaving is not stopped due to insufficient warp tension after the start of new weaving. . Therefore, erroneous detection of warp breakage at the start of weaving after replacement of a new warp beam can be avoided without performing the troublesome work of interrupting the signal cable in the warp cut detection device, and unnecessary weaving stoppage is avoided. You.
[0025]
After weaving is stopped for some reason, when weaving is restarted, the enable switch 32 is turned on. The invalidation circuit 29 enters the activation mode by turning on the activation switch 32.
[0026]
When weaving is resumed, the tensions of the individual warps are uniform, and there is no need to invalidate the warp cut detection signal. Therefore, when weaving is restarted, it is necessary to turn on the activation switch 32 to select the activation mode. The existence of the selection switch circuit composed of the invalidation switch 31 and the activation switch 32 is advantageous in ensuring the activation of the function of the warp cut detection device 28 when weaving is resumed.
[0027]
Next, a second embodiment of FIGS. 3 and 4 will be described. The same components as those in the first embodiment are denoted by the same reference numerals. In this embodiment, a jet loom is targeted. Reference numeral 34 denotes a weft length measuring and storing device of a winding type. The yarn winding tube 341 is driven to rotate by a winding motor 342, and the rotation drives the weft Y around the yarn winding surface 343. The weft Y measured and stored by the weft length measuring and storing device 34 is ejected from the weft insertion main nozzle 35 and is passed to the plurality of auxiliary weft insertion nozzles 36 for relay injection. A weft detector 37 is provided at the weft insertion end, and the weft detector 37 obtains information for determining whether or not the leading end of the weft Y has arrived.
[0028]
The unwinding of the weft from the yarn winding surface 343 of the weft measuring and storing device 34 and the prevention of the unwinding are performed by the excitation and demagnetization of the electromagnetic solenoid 38 that drives the locking pin 381. Excitation / demagnetization control of the electromagnetic solenoid 38 is performed according to a command from the loom control computer C1, and the loom control computer C1 controls excitation and demagnetization of the electromagnetic solenoid 38 based on loom rotation angle detection information obtained from the rotary encoder 26. The loom control computer C1 controls the operation of the winding motor 342.
[0029]
The weft Y unwound from the yarn winding surface 343 is detected by the weft unwind detector 39. When the number of unwinds detected by the weft unwind detector 39 reaches the set number, the loom control computer C1 commands the demagnetization of the electromagnetic solenoid 38, and the locking pin 381 engages with the yarn winding surface 343 to unwind the weft. To block.
[0030]
The weft insertion pressure air injection of the weft insertion main nozzle 35 is controlled by the excitation and demagnetization of the electromagnetic on / off valve 40, and the pressure air injection of the weft insertion auxiliary nozzle 36 is controlled by the excitation and demagnetization of the electromagnetic on / off valve 41. Excitation and demagnetization control of each of the electromagnetic on-off valves 40 and 41 is performed by a command from the loom control computer C1.
[0031]
The normally inserted weft yarn Y is cut by the electromagnetic cutter 42, and the subsequent weft insertion is continued. The excitation and demagnetization of the electromagnetic cutter 42 is controlled by the loom control computer C1, and the loom control computer C1 controls the excitation and demagnetization of the electromagnetic cutter 42 for each weft insertion based on the yarn presence / absence information from the weft detector 37. When a weft insertion error occurs, the loom control computer C1 immediately stops the operation of the loom drive motor M and the excitation / demagnetization control of the electromagnetic cutter 42, and the weft Y1 having the weft insertion error and the succeeding weft Y2 are cut off. Connection is maintained. The miss yarn Y1 is removed from the inside of the warp shedding by a weft processing device (not shown) using the subsequent weft Y2 as a clue.
[0032]
The weft detector 37 detects whether or not the weft has arrived. If a weft insertion error that the weft does not arrive occurs, the weft detector 37 invalidates the weft insertion error detection signal which is a weaving abnormality detection signal. Output to the circuit 29.
[0033]
FIG. 4 is a flowchart showing a weaving abnormality detection control program by the loom control computer C1 and the weaving abnormality detection control device C2. The weft insertion error detection signal output while the number of weft insertions Nx after the warp beam exchange does not reach the set number of weft insertions No is invalidated. Therefore, weaving is not stopped by the output of the weft insertion error detection signal from the start of weaving after the warp beam exchange to the set number of weft insertion No.
[0034]
Adjacent warps may become entangled due to uneven warp tension after the warp beam exchange, and the inserted weft may be caught on the entangled warp. However, since the woven fabric portion in the woven state after the start of new weaving is not used as a fabric product, the fabric defect of the woven portion can be ignored. Therefore, during the weaving of the woven portion, there is no problem even if the weft insertion error detection signal is invalidated and the weaving is continued. Such continuation of weaving is advantageous in increasing the operation rate of the loom.
[0035]
Next, a third embodiment of FIG. 5 will be described. The device configuration is the same as in the second embodiment. As shown in the flowchart of FIG. 5, when the weft detector 37 outputs the weft insertion error detection signal twice in succession, the invalidation circuit 29 outputs the weaving stop signal even when the invalidation circuit 29 is in the invalidation mode. Is output to the loom control computer C1. The case where the weft insertion error occurs twice in succession is, for example, a yarn feeding error to the weft insertion main nozzle 35. When such a yarn feeding error occurs, it is necessary to stop the weaving. In this embodiment, weaving abnormality detection control can be performed in response to occurrence of a yarn feeding error.
[0036]
Next, a fourth embodiment of FIGS. 6 and 7 will be described. The same components as those in the first embodiment and the second embodiment are denoted by the same reference numerals. In this embodiment, both the function of the warp cut detection device 28 and the function of the weft detector 37 are invalidated while the number of weft insertions Nx after the start of new weaving does not reach the set number of weft insertions No. Therefore, the same effects as those of the first and second embodiments can be obtained.
[0037]
Next, a fifth embodiment shown in FIGS. 8 and 9 will be described. The same components as those in the second embodiment are denoted by the same reference numerals.
In this embodiment, the sensor head 43 is attached to an endless belt 44, and the endless belt 44 is driven by a motor 45 to reciprocate. As the endless belt 44 reciprocates, the sensor head 43 reciprocates above the woven fabric W in the weaving width direction. The sensor head 43 projects light onto the woven fabric W, picks up the reflected light, and determines whether there is a defect on the woven fabric W based on the intensity of the reflected light. If there is a defect on the woven fabric W, the sensor head 43 outputs a defect detection signal serving as a weaving abnormality detection signal to the invalidation circuit 29.
[0038]
While the number of weft insertions Nx after the start of new weaving does not reach the set number of weft insertions No, the invalidation circuit 29 invalidates the defect detection signal. It can be said that the cloth in the woven portion is full of defects, and the inspection of such a cloth portion is meaningless. According to this embodiment, weaving stoppage due to meaningless cloth defect detection, ie, inspection of the woven portion, can be avoided.
[0039]
Note that an embodiment in which the reciprocating operation of the sensor head 43 is not performed in the invalidation mode state is also possible.
In the above-described embodiments, the output of the warp cut detection signal, the weft insertion error detection signal, and the weaving abnormality detection signal such as the defect detection signal are invalidated. An embodiment is also possible in which the weaving abnormality detection signal is not output until the number of times has not reached. The sixth embodiment of FIGS. 10 and 11 is an example of an embodiment in which a weaving abnormality detection signal is not output. The same components as those in the first embodiment are denoted by the same reference numerals.
[0040]
In this embodiment, a warp cut detection signal output from the warp cut detection device 28 is input to the loom control computer C1 via the open / close switch circuit 46. The loom control computer C1 issues a command to stop weaving in response to the input of the warp cut detection signal. The invalidation circuit 47 included in the weaving abnormality detection control device C2 controls opening and closing of the open / close switch circuit 46. As shown in the flowchart of FIG. 11, the invalidating circuit 47 keeps the open / close switch circuit 46 in the open state while the number of weft insertions Nx after the start of new weaving does not reach the set number of weft insertions No. When the new weft insertion frequency Nx reaches the set weft insertion frequency No, the invalidation circuit 47 closes the open / close switch circuit 46. Therefore, in the weaving state, the warp cut detection signal is not output to the loom control computer C1, and the same effect as in the first embodiment can be obtained.
[0041]
The function of the weaving abnormality detecting means can be disabled by stopping the power supply to the weaving abnormality detecting means in addition to the above embodiment.
The inventions other than the claims described in the above embodiments will be described below together with their effects.
(1) In a weaving machine having a weaving abnormality detection unit that outputs a weaving abnormality detection signal, after prohibiting the output of the weaving abnormality detection signal from the weaving abnormality detection unit, after a predetermined weaving progress, the weaving abnormality detection unit outputs Method for detecting weaving abnormality in a loom that allows the output of a weaving abnormality detection signal.
[0042]
The same effect as in the first embodiment can be obtained.
Hereinafter, effects of the embodiment will be described. (1) In the embodiment adopting the selection switch circuit including the invalidation switch 31 and the activation switch 32, it is convenient to secure the activation of the function of the warp cut detection device 28 when weaving is resumed. (2) Even in the case where the invalidating circuit 29 is in the invalidating mode, the weaving is stopped when the weft detector 37 outputs the weft insertion error detection signal twice consecutively. It is possible to perform the weaving abnormality detection control that has been dealt with.
[0043]
【The invention's effect】
After disabling the function of the weaving abnormality detection means as described in detail above, the function of the weaving abnormality detection means is automatically enabled after a predetermined weaving progress. This has an excellent effect that the switching to can be performed automatically without relying on humans.
[Brief description of the drawings]
FIG. 1 is a side view showing a first embodiment. FIG. 2 is a flowchart showing a weaving abnormality detection control program.
FIG. 3 is a front view showing a second embodiment.
FIG. 4 is a flowchart showing a weaving abnormality detection control program.
FIG. 5 is a flowchart illustrating a weaving abnormality detection control program according to a third embodiment.
FIG. 6 is a side view showing a fourth embodiment.
FIG. 7 is a flowchart showing a weaving abnormality detection control program.
FIG. 8 is a front view showing a fifth embodiment.
FIG. 9 is a flowchart showing a weaving abnormality detection control program.
FIG. 10 is a side view showing a sixth embodiment.
FIG. 11 is a flowchart showing a weaving abnormality detection control program.
[Explanation of symbols]
Reference numeral 26: a rotary encoder serving as a weaving progress detecting means; 28, a warp cut detecting device serving as a weaving abnormality detecting means; 29, a disabling circuit serving as a disabling means; 30; a canceling circuit serving as a canceling means; , An enabling switch constituting a selection switch circuit, 37 a weft detector serving as a weaving abnormality detecting means, 43 a sensor head serving as a weaving abnormality detecting means, and 47 a disabling means serving as an invalidating means. Circuit, C2 ... weaving abnormality detection control device.

Claims (2)

In a weaving machine having a weaving abnormality detection unit that detects a weaving abnormality and outputs a weaving abnormality detection signal,
When a new weaving is started, the function of the weaving abnormality detecting means is disabled, and then the function is automatically enabled after a predetermined weaving progress. Activate the function of the detection means ,
Disabling and enabling the function of the weaving abnormality detection means is performed by disabling and enabling the weaving abnormality detection signal,
The weaving abnormality detection means is a weft detector for detecting whether or not the weft inserted into the jet loom has arrived. In a state where the weaving abnormality detection signal is invalidated, the weft detector continuously performs two weaving abnormality detection signals. Weaving abnormality detection control method in a loom that stops weaving when is output . The weaving abnormality detection control method for a loom according to claim 1, wherein after the function of the weaving abnormality detection unit is disabled, weaving is started by turning on a start switch, and the function is automatically enabled after a predetermined weaving progress. .

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