Control method of loom

Abstract

To provide a method for controlling a loom, capable of preventing the occurrence of a defect in weaving such as the stop of weft as much as possible when an actual value of arrival timing deviates from a lower limit of a target arrival angle range.SOLUTION: In a loom in which a spindle controller and / or a weft insertion controller are controlled so as to return an arrival timing within a target arrival angle range when arrival data based on actual values of the arrival timing for a plurality of pick numbers deviates from a target arrival angle range, the number of picks of arrival data when the arrival timing exists on a lower limit side smaller than a target value is set as a number smaller than the number of picks of the arrival data when the arrival timing exists on an upper limit side, and / or an upper limit and a lower limit are set so that the absolute value of the difference between a lower limit of the target arrival angle range and the target value is smaller than the absolute value of the difference between an upper limit of the target arrival angle range and the target value.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a loom that determines an actual value of a weft arrival timing based on a detection signal from a weft sensor, and uses a target arrival angle range defined by an upper limit value that is higher than a target value of the arrival timing and a lower limit value that is lower than the target value, as well as arrival data based on the actual values ​​for a number of picks, and controls a main shaft control device and / or a weft insertion control device so as to return the arrival timing to within the target arrival angle range when the arrival data deviates from the target arrival angle range. [Background technology]

[0002] It has been known that in a loom, the weft insertion and the loom speed are controlled so that the arrival timing of the inserted weft (the timing when the tip of the weft reaches a preset position) is the desired timing during weaving. It is also known that even if the weft insertion is performed under the same conditions, the arrival timing of the weft varies to a certain extent. In the conventional control, therefore, an upper limit value, which is an upper limit value that is a permissible value on the upper side greater than the target value, and a lower limit value, which is a permissible value on the lower side less than the target value, are determined for a target weft arrival timing (target value), and a target arrival angle range consisting of the upper limit value and the lower limit value is set. The control is executed when the actual arrival timing of the weft (actual value) deviates from the target arrival angle range.

[0003] In addition, in weft insertion during weaving, the timing of the weft thread arrival may change temporarily due to various causes. However, if the control is executed when the actual value deviates from the target arrival angle range due to such a temporary change, the weaving operation of the loom may become unstable. Therefore, in the past, the control has been executed using arrival data based on the actual values ​​for multiple picks. Specifically, the control is executed based on a comparison between the average value of the actual values ​​for multiple picks and the target arrival angle range, or, as disclosed in Patent Document 1, the control is executed when the actual value deviates from the target arrival angle range continuously over a preset number of picks. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2002-069800 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the conventional loom, when the control is performed using the arrival data, the control is performed using arrival data with the same number of picks on the upper limit side and the lower limit side. Therefore, in such a conventional loom, when the weft is flying in such a way that the actual value deviates from the lower limit side, the weft insertion becomes unstable, and there is a risk of weaving problems such as weft stopping. The details are as follows.

[0006] First, when the loom is an air injection loom, the injection period of each sub-nozzle is set based on the set weft insertion start timing, the set weft flight curve obtained from the target value, and the position of the sub-nozzle, and a leading period (leading period) and a trailing period (trailing period) are set with respect to the reference timing. However, since the leading period is a period of leading injection before the weft reaches the position of the sub-nozzle, it is generally set to be shorter than the trailing period.

[0007] In the weft insertion in such an air jet loom, when the actual value is outside the lower limit (the arrival timing is earlier), the control is conventionally performed using the arrival data, and the control is performed, for example, when the state where the actual value is outside the lower limit occurs consecutively for a set number of picks. In other words, the decision on whether to perform the control is not made until the weft insertion for the set number of picks is completed, and weft insertion continues during the period even if the actual value is outside the lower limit.

[0008] In addition, unless the device is abnormal (broken), even if the weft flight state changes and falls outside the lower limit, the passing timing of the tip of the weft at the position of each sub-nozzle is usually within the preceding period, although it is close to the jet start timing of the sub-nozzle. However, in weft insertion of a loom, the arrival timing (flying state) of the weft may temporarily change significantly as described above. Therefore, in a flying state in which the tip of the weft passes at a timing close to the jet start timing as described above, if such a large change occurs, the passing timing may become earlier than the jet start timing of the sub-nozzle, that is, the weft may reach the position of the sub-nozzle before the jet of the sub-nozzle starts. If the weft reaches the position of the sub-nozzle before the jet of the sub-nozzle starts, the flying state of the weft becomes unstable, which results in weaving problems such as weft stoppage.

[0009] Therefore, an object of the present invention is to provide a method for controlling a loom, which is capable of preventing as much as possible the occurrence of weaving defects such as weft stoppage in a loom in which the control is performed using the reached data when the actual value falls outside the lower limit value. [Means for solving the problem]

[0010] The present invention is applied to a loom that determines an actual value of a weft arrival timing based on a detection signal from a weft sensor, and controls a main shaft control device and / or a weft insertion control device using a target arrival angle range defined by an upper limit value higher than a target value of the arrival timing and a lower limit value lower than the target value, and arrival data based on the actual values ​​for a number of picks, so as to return the arrival timing to within the target arrival angle range when the arrival data deviates from the target arrival angle range.The control method for a loom according to the present invention is characterized in that the number of picks of the arrival data when the arrival timing is on the lower limit side is set to a number smaller than the number of picks of the arrival data when the arrival timing is on the upper limit side, and / or the upper limit value and the lower limit value are set so that the absolute value of the difference between the target value and the lower limit value is smaller than the absolute value of the difference between the target value and the upper limit value. Effect of the Invention

[0011] According to the present invention, when the actual value is outside the lower limit, the control is executed at an earlier point (when a smaller number of picks have been inserted) than when the actual value is outside the upper limit. Therefore, compared to the conventional method in which the control on the lower limit side is executed using arrival data based on the same number of picks as the upper limit side, the number of picks for which weft insertion is continued when the actual value is outside the lower limit is reduced, so that the possibility of a temporary large change in the arrival timing is reduced. This makes it possible to prevent weaving problems such as weft stoppage as much as possible. [Brief description of the drawings]

[0012] [Figure 1] 1 is an explanatory diagram showing an example of an air jet loom to which the present invention is applied; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] An embodiment of the method for controlling a loom according to the present invention will now be described with reference to Fig. 1. The example shown below is an example in which the present invention is applied to an air jet loom.

[0014] As shown in FIG. 1, an air jet loom (hereinafter simply referred to as the "loom") 1 comprises a length measuring and storing device 11 including a storage drum 14 in which a weft yarn Y is stored and a locking pin 13 that controls the storage and unwinding of the weft yarn Y relative to the storage drum 14, a main nozzle 17 provided on the yarn supply side, which are weft insertion nozzles that inject compressed air, and a plurality of sub-nozzles 18 arranged in parallel along the weft insertion direction (weaving width direction).

[0015] The main nozzle 17 is connected to a supply source 61 that supplies compressed air via a pipe 62. An electromagnetic on-off valve 63 for controlling the supply (injection timing) of compressed air to the main nozzle 17 is provided in the pipeline of the pipe 62 connected to the main nozzle 17. Each sub-nozzle 18 is connected to the supply source 61 via a pipe 64. In the illustrated example, the sub-nozzles 18 are divided into groups of multiple (two) nozzles. An electromagnetic on-off valve 65 corresponding to each group for controlling the supply (injection timing) of compressed air to the sub-nozzles 18 of the corresponding group is provided in the pipeline of the pipe 64 corresponding to each group.

[0016] The loom 1 also includes, as weft sensors for detecting the weft Y, an unwinding sensor 15 for detecting the weft Y unwound from the storage drum 14, and a feeler 19 for detecting the weft Y that has reached the counter-feeding side. Furthermore, the loom 1 includes an encoder 55 which is an angle sensor for detecting the rotation angle (crank angle) of the main shaft 51.

[0017] The loom 1 also includes an input setting device 23 for inputting and setting each setting value related to the control of each device on the loom 1. The setting values ​​include a setting value for controlling the drive of the locking pin 13, setting values ​​for controlling the drive of the electromagnetic on-off valve 63 and each electromagnetic on-off valve 65, such as the injection start timing and injection end timing of the main nozzle 17 and each sub-nozzle 18, and a setting value for controlling the drive of the main shaft motor 53 that rotates and drives the main shaft 51, such as the rotation speed of the main shaft 51.

[0018] The set values ​​include a target value for the arrival timing of the weft Y, an upper limit value that is an upper limit allowable value that is greater than the target value, and a lower limit value that is a lower limit allowable value that is less than the target value, which are set values ​​that define a target arrival angle range. The upper limit value and the lower limit value are determined in advance based on weaving conditions such as the rotation speed of the loom 1 and the type of weft Y to be inserted. In this embodiment, the upper limit value is a value obtained by adding a predetermined crank angle to the target value, and the lower limit value is a value obtained by subtracting a crank angle equal to the predetermined crank angle from the target value. The set values ​​input and set from the input setting device 23 are stored in a memory 37 included in the loom control device 21.

[0019] The loom control device 21 also includes a main shaft controller 43 for controlling the drive of the main shaft 51, and a weft insertion controller 41 for controlling the weft insertion, in addition to the memory 37. Of these, the main shaft controller 43 is connected at its input end to the memory 37 and an encoder 55, and is connected at its output end to the main shaft motor 53. The main shaft controller 43 is configured to control the drive of the main shaft 51 based on the set rotation speed set (stored) in the memory 37.

[0020] The weft insertion controller 41 has an input end connected to the encoder 55, and an output end connected to the locking pin 13, the electromagnetic on-off valve 63, and each electromagnetic on-off valve 65. The weft insertion controller 41 is configured to control the driving of the locking pin 13, the electromagnetic on-off valve 63, and each electromagnetic on-off valve 65 based on the unwinding timing, the jet start timing of the main nozzle 17, and the jet timing of each sub-nozzle 18, all of which are set (stored) in the memory 37.

[0021] Furthermore, the loom control device 21 includes, as components for bringing the arrival timing of the weft yarn Y into the target arrival angle range, a calculator 31 for determining an actual value of the arrival timing, a comparator 33 for comparing the actual value with the target arrival angle range, a counter 35 for counting the number of consecutive deviations of the actual value from the target arrival angle range based on the comparison result of the comparator 33, and a rotation speed changer 39 for changing the set rotation speed based on the count result of the counter 35. The components are described in detail below.

[0022] The calculator 31 has an input terminal connected to the encoder 55 and the feeler 19, and an output terminal connected to the comparator 33. When a detection signal is input from the feeler 19, the calculator 31 is configured to obtain the crank angle at that time point based on the signal from the encoder 55. The obtained crank angle is the actual value. The calculator 31 is configured to output a signal (angle signal) indicating the obtained actual value to the comparator 33.

[0023] The comparator 33 is connected to the memory 37, and has an output terminal connected to the counter 35. The comparator 33 is configured to compare the actual value indicated by the angle signal with the target angle range stored in the memory 37 (specifically, the upper limit value and the lower limit value) every time the angle signal is input from the calculator 31.

[0024] Moreover, comparator 33 is configured to output an upper limit deviation signal indicating that the actual value has deviated from the target angle range on the upper limit side to counter 35 when the actual value is greater than the upper limit value, and to output a lower limit deviation signal indicating that the actual value has deviated from the target angle range on the lower limit side to counter 35 when the actual value is smaller than the lower limit value. Furthermore, comparator 33 is configured to output a non-deviation signal to counter 35 when the actual value is equal to or greater than the lower limit value and equal to or less than the upper limit value, i.e., when the actual value is within the target angle range.

[0025] Counter 35 is connected to memory 37, and has an output terminal connected to rotation speed changer 39. Counter 35 also has two counters to which the upper limit deviation signal, lower limit deviation signal, and non-deviation signal from comparator 33 are input. One of the two counters is an upper limit counter that counts the number of times the upper limit deviation signal is input, and the other is a lower limit counter that counts the number of times the lower limit deviation signal is input. The upper limit counter is configured to reset its count value when the non-deviation signal or the lower limit deviation signal is input, and the lower limit counter is configured to reset its count value when the non-deviation signal or the upper limit deviation signal is input.

[0026] Such an upper limit counter and a lower limit counter count the number of consecutive inputs of an upper limit deviation signal or a lower limit deviation signal, respectively, and the count value corresponds to the number of picks by which the actual value consecutively deviates from the target angle range on the upper limit side or the lower limit side.

[0027] In addition, the memory 37 is set with a pick number (set pick number) that is a reference for executing a correction control, which is a control for returning the actual value to the target angle range when the actual value continuously deviates from the target angle range to the upper limit side or the lower limit side. The counter 35 is configured to output a rotation speed reduction command signal to the rotation speed changer 39 when the count value of the upper limit counter reaches the set pick number. The counter 35 is also configured to output an increase command signal to the rotation speed changer 39 when the count value of the lower limit counter reaches the set pick number. The counter 35 is also configured to reset the count value of the upper limit counter in response to the output of the decrease command signal, and reset the count value of the lower limit counter in response to the output of the increase command signal.

[0028] The rotation speed changer 39 is connected to the counter 35 as described above, and is also connected to the memory 37. In this embodiment, the correction control described above is a control for increasing or decreasing the rotation speed of the loom 1 by adding or subtracting a set rotation speed (correction rotation speed) to or from the current set rotation speed of the loom 1. The correction rotation speed is set in the memory 37. The correction rotation speed is determined in advance based on weaving conditions such as the initial set rotation speed and the type of weft yarn Y.

[0029] The rotation speed changer 39 is configured to read out the current set rotation speed and the correction rotation speed from the memory 37 when an increase command signal or a decrease command signal is input from the counter 35. The rotation speed changer 39 is configured to add the correction rotation speed to the current set rotation speed when the input signal is an increase command signal, and to subtract the correction rotation speed from the current set rotation speed when the input signal is a decrease command signal. The rotation speed changer 39 is configured to set the set rotation speed obtained by the addition or subtraction in the memory 37 as a new set rotation speed.

[0030] In the loom 1 equipped with the loom control device 21 having the above-mentioned configuration, when the inserted weft yarn Y is detected by the feeler 19 and the detection signal is input to the calculator 31, the calculator 31 finds the actual value for the arrival timing and outputs it to the comparator 33. Then, the comparator 33 compares the actual value with the upper limit value and the lower limit value, and outputs any one of the signals, an upper limit deviation signal, a lower limit deviation signal, or a non-deviation signal, to the counter 35 as a result of the comparison.

[0031] In counter 35, when an upper limit deviation signal is successively input to the upper limit counter or a lower limit deviation signal is successively input to the lower limit counter, the counter 35 counts the number of times the signal occurs. However, when a non-deviation signal is input to the upper limit counter or the lower limit counter during the count, the count value is reset. Also, when a lower limit deviation signal is input to the upper limit counter during the count, or an upper limit deviation signal is input to the lower limit counter, the count value is reset. Then, when the count value of the upper limit counter reaches the set pick number, a decrease command signal is output to rotation speed changer 39. Also, when the count value of the lower limit counter reaches the set pick number, an increase command signal is output to rotation speed changer 39.

[0032] Then, as the counter 35 outputs a lowering command signal or an increasing command signal, the rotation speed changer 39 changes the set rotation speed to one obtained by adding or subtracting the correction number of rotations, and the loom 1 is operated at the changed set rotation speed. As a result of changing the rotation speed of the loom 1 in this way and changing the operating speed of the loom 1 relative to the flying of the weft yarn Y due to weft insertion, the actual value is returned within the target angle range, and the state in which the actual value continuously deviates from the target angle range is eliminated.

[0033] In this embodiment, the correction control is performed based on the fact that the actual value continuously deviates from the target reaching angle range as described above. Therefore, in this embodiment, the set of continuous actual values ​​corresponds to the reaching data (based on the actual values ​​for a number of picks) referred to in the present invention. The correction control (control for returning the actual value to the target reaching angle range) is a control for changing the set rotation speed and changing the rotation speed (operating speed) during operation of the loom 1. The operation of the loom 1 (driving of the main shaft 51) is controlled by the main shaft controller 43. Therefore, in this embodiment, the main shaft controller 43 corresponds to a main shaft control device that controls the reaching timing to be returned to the target reaching angle range.

[0034] In the loom 1 described above, in this embodiment based on the present invention, the number of picks of the arriving data when the arrival timing is on the lower limit side is set to a value smaller than the number of picks of the arriving data when the arrival timing is on the upper limit side.

[0035] Specifically, as described above, the set pick number that is the basis for executing the correction control is input and set by the input setting device 23, and is set (stored) in the memory 37 of the loom control device 21. In addition, the loom 1 is configured so that the input setting device 23 and the loom control device 21 (memory 37) can set the set pick number separately into an upper limit pick number related to the upper limit side and a lower limit pick number related to the lower limit side.

[0036] The counter 35 is configured to compare the count value of the upper limit counter with the upper limit pick number when the actual value continuously deviates from the target angle range on the upper limit side, and to compare the count value of the lower limit counter with the lower limit pick number when the actual value continuously deviates from the target angle range on the lower limit side.

[0037] The upper limit pick number and the lower limit pick number are determined based on weaving conditions such as the type of weft yarn Y. In the present invention, the lower limit pick number is set to a value smaller than the upper limit pick number. In this embodiment, the upper limit pick number is set to "8" and the lower limit pick number is set to "6".

[0038] Therefore, with such a loom 1, when the actual value continuously deviates from the target angle range, the above-mentioned correction control (in this embodiment, changing the rotation speed of the loom 1) is executed when the deviating pick number reaches the set pick number, and the actual value is returned to the target angle range. If the deviation is on the upper limit side, the upper limit pick number, which is the set pick number, is set to 8 picks, so the above-mentioned correction control is executed when the deviating pick number reaches 8 picks.

[0039] On the other hand, when the deviation is on the lower limit side, the lower limit pick number, which is the set pick number, is set to 6 picks, which is a value smaller than the upper limit pick number, so the correction control is executed when the deviating pick number reaches 6 picks, that is, two picks earlier than the upper limit side from the point when the continuous deviation starts. Therefore, when the deviation is on the lower limit side, the actual value is returned to the target arrival angle range at an earlier point in time than when the deviation is on the upper limit side.

[0040] Furthermore, according to such a control method for the loom 1, when the deviation occurs on the lower limit side, it is possible to minimize the occurrence of weaving problems such as weft stop caused by such deviation occurring continuously.

[0041] More specifically, the reason for determining whether or not to execute the correction control using the arrival data is that the arrival timing (actual value) of the weft Y varies and may change significantly temporarily, as described above, and the set pick number that is the basis of the arrival data is set for that reason. It is considered preferable to set the set pick number to a larger number, taking into account the influence of the temporary large change (temporary change) in the arrival timing. The idea of ​​the change in the arrival timing is common to both the upper limit side and the lower limit side, and there is no particular difference in the tendency of the change. For this reason, in the past, there was no idea of ​​making the set pick number different between the upper limit side and the lower limit side, and generally, a common (same) pick number is set as the set pick number for the upper limit side and the lower limit side.

[0042] On the other hand, when the deviation is on the lower limit side, in a typical sub-nozzle jetting period setting, the period from the jetting start timing of each sub-nozzle to the timing when the tip of the weft yarn passes through the position of that sub-nozzle in the set flying state of the weft yarn Y is short, and the timing margin between the jetting start timing and the lower limit is small, so that when the temporary change occurs, the tip of the weft yarn Y may reach the position of that sub-nozzle before the jetting start timing, resulting in weaving problems such as weft stoppage.The larger the set pick number, the higher the possibility of the temporary change occurring during the continuous deviation.

[0043] Therefore, in the present invention, instead of using a common set pick number for the upper limit side and the lower limit side as in the conventional method, different set pick numbers can be set for the upper limit side and the lower limit side, and the set pick number is used for each side. In addition, for the upper limit side, a larger pick number is set as the set pick number, taking into account the change in arrival timing, while for the lower limit side, the lower limit side pick number as the set pick number is set to a pick number smaller than the upper limit side pick number, taking into account the change in arrival timing, but also taking into account the possibility of the weaving defect occurring in that case. In this embodiment, the upper limit side pick number is set to 8 and the lower limit side pick number is set to 6, taking into account the weaving conditions such as the type of weft yarn Y.

[0044] According to the control method for the loom 1 of this embodiment (the present invention), when the correction control is performed based on the reach data, the correction control is performed at an earlier point in time on the lower limit side, and the actual value is returned to the target reach angle range side, compared to when a common set number of picks is used for the upper limit side and the lower limit side. As a result, when the continuous deviation occurs on the lower limit side, the temporary change occurs during that time, and the occurrence of the weaving problems described above is suppressed as much as possible.

[0045] The present invention is not limited to the embodiments described above (the above embodiments), but can be practiced in modified embodiments such as the following (1) to (4).

[0046] (1) Regarding the arrival data based on the actual values ​​of the arrival timings for a number of picks, in the above embodiment, a set of consecutive actual values ​​corresponds to the arrival data, as described above. However, in the present invention, the arrival data is not limited to such a set of consecutive actual values, and may be an average value of the actual values.

[0047] Specifically, the loom control device is configured to calculate an average value of the actual values ​​for each preset number of picks, for example, and compare the average value with the target angle range, i.e., compare the average value with the upper limit value and the lower limit value.The loom control device is then configured to calculate two types of average values ​​so that the average values ​​to be compared with the upper limit value and the lower limit value are average values ​​calculated from different numbers of picks, and to compare each average value with the corresponding upper limit value or lower limit value.In this case, the number of picks for calculating the average value to be compared with the lower limit value (the number of picks calculated on the lower limit side) is set to a number smaller than the number of picks for calculating the average value to be compared with the upper limit value (the number of picks calculated on the upper limit side).

[0048] In this configuration, since the lower limit side calculation pick number is set to a number smaller than the upper limit side calculation pick number, the comparison between the lower limit value and the average value is performed in a shorter cycle than the comparison between the upper limit value and the average value. As a result, when the arrival timing (the actual value) changes so that the average value deviates toward the lower limit side, the correction control is performed at an earlier point in time than when the actual value changes so that the average value deviates toward the upper limit side. Therefore, even in this case, weaving problems caused by a temporary large change in the arrival timing are suppressed as much as possible.

[0049] (2) In the above-described example, the control method according to the present invention (the present control method) aims to execute the correction control earlier when the arrival timing (the actual value) is on the lower limit side than when it is on the upper limit side, and achieves this aim by setting the number of picks of arrival data to a smaller number on the lower limit side than on the upper limit side. However, the present control method is not limited to being executed by making the number of picks of arrival data different in this way, and may be executed by setting the allowable range on the lower limit side for the target value of the arrival timing for the target arrival angle range to be smaller than the allowable range on the upper limit side.

[0050] More specifically, for the target arrival angle range, the difference (absolute value) between the target value and the upper limit value, which is the upper limit side tolerance range, is set in the same manner as in the past, and then the difference (absolute value) between the target value and the lower limit value, which is the lower limit side tolerance range, is set so as to be smaller than the upper limit side difference. As a result, when the arrival timing shifts to the upper limit side or the lower limit side with the same tendency, the arrival data deviates from the lower limit side even if the shift amount is smaller than that of the upper limit side, so even in this case, the occurrence of weaving problems due to the occurrence of a temporary large change in the arrival timing can be suppressed as much as possible.

[0051] In this example, the number of picks of the arriving data may be the same on the upper limit side and the lower limit side, or the number of picks of the arriving data may be set smaller on the lower limit side than on the upper limit side as in the above embodiment and the example (1). In other words, this example and the above example can be combined for implementation.

[0052] (3) Regarding the control (the correction control) performed to bring the arrival timing back within the target arrival angle range when the arrival data deviates from the target arrival angle range, in the above embodiment, the correction control is performed with the rotation speed of the loom as the control object, and the main shaft control device adds or subtracts a preset correction rotation speed (fixed value) to or from the currently set rotation speed.

[0053] However, even when the control object is the rotation speed, the correction control is not limited to being performed using such a preset correction rotation speed. When the attainment data is the average value of the actual values ​​as in the example (1) above, the deviation between the average value and the target value may be calculated, and the correction control may be performed at a correction rotation speed corresponding to the deviation.

[0054] Furthermore, the control target of the correction control is not limited to the rotation speed of the loom as described above, but may be weft insertion conditions such as the timing and pressure related to weft insertion. Specifically, the control targets may be the operation timing of the locking pin, the injection timing of the main nozzle and each sub-nozzle, the pressure of compressed air supplied to the main nozzle and each sub-nozzle, etc. as weft insertion conditions, and when the arrival data deviates from the target arrival angle range, the weft insertion control device may change these weft insertion conditions to execute the correction control (control to return the arrival timing to within the target arrival angle range).

[0055] In addition, in the case where the weft insertion conditions are controlled in this way, the correction control may be performed by setting the correction timing and the correction pressure used to change the weft insertion conditions as predetermined fixed values, and when the arrival data deviates from the target arrival angle range, adding or subtracting the correction timing to or from the current injection timing of the main nozzle or each sub-nozzle, or adding or subtracting the correction pressure to or from the current set pressure of the compressed air. In addition, when the arrival data is set to the average value of the actual values, the correction timing or the correction pressure corresponding to the deviation from the deviation between the average value and the target value may be calculated, and the correction control may be performed using the correction timing or the correction pressure.

[0056] In addition, the control target of the correction control is not limited to either the loom speed or the weft insertion condition, but may be both the loom speed and the weft insertion condition. In this case, for example, the correction control may be executed with the weft insertion condition as the control target first, and then when the correction amount becomes large, the control may be switched to the correction control with the loom speed as the control target.

[0057] (4) In the above embodiment, the arrival timing used as the actual value is calculated based on the detection signal of a weft sensor (feeler 19) that detects the arrival of a weft on the counter-feeding side. That is, in the above embodiment, the arrival timing is the timing when the tip of the weft reaches a predetermined position on the counter-feeding side. However, in the present invention, the arrival timing is not limited to the timing when the tip of the weft reaches a predetermined position on the counter-feeding side, but may be the timing when the tip of the weft passes a predetermined position in the weft insertion direction during the warp shed. In this case, the arrival timing is calculated based on the detection signal of a weft sensor (unwinding sensor) that detects a weft unwound from a storage drum of a length measuring and storage device on the yarn supplying side.

[0058] Incidentally, when the arrival timing is determined based on the detection signal of the unwinding sensor, the present invention is not limited to being applied to the air jet loom of the above embodiment, but can also be applied to a water jet loom.

[0059] Furthermore, the present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit of the present invention. [Explanation of symbols]

[0060] 1 Loom 11 Length measuring storage device 13 locking pin 14 storage drum 15 Unwinding sensor 17 Main nozzle 18 Sub-nozzle 19 Feeler 21 Loom control device 23 Input setting device 31 Calculator 33 Comparator 35 Counter 37 Memory 39 Rotation speed changer 41 Weft insertion controller 43 Spindle controller 51 Spindle 53 Spindle motor 55 Encoder 61 Supply source 62, 64 Piping 63, 65 Solenoid valve Y Weft T Warp

Claims

[Claim 1] a weaving machine which determines an actual value of a weft arrival timing based on a detection signal from a weft sensor, and uses a target arrival angle range defined by an upper limit value on the upper limit side that is greater than a target value of the arrival timing and a lower limit value on the lower limit side that is less than the target value, and arrival data based on the actual values ​​for a number of picks, and controls a main shaft control device and / or a weft insertion control device so as to return the arrival timing to within the target arrival angle range when the arrival data deviates from the target arrival angle range, The number of picks of the arriving data when the arrival timing is on the lower limit side is set to a number smaller than the number of picks of the arriving data when the arrival timing is on the upper limit side, and / or the upper limit value and the lower limit value are set so that the absolute value of the difference between the target value and the lower limit value is smaller than the absolute value of the difference between the target value and the upper limit value. A method for controlling a loom, comprising:

Images