CN108070949B - Weft yarn flight state detection device in air jet loom - Google Patents
Weft yarn flight state detection device in air jet loom Download PDFInfo
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- CN108070949B CN108070949B CN201711129439.4A CN201711129439A CN108070949B CN 108070949 B CN108070949 B CN 108070949B CN 201711129439 A CN201711129439 A CN 201711129439A CN 108070949 B CN108070949 B CN 108070949B
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
- D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
- D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
- D03D47/3066—Control or handling of the weft at or after arrival
- D03D47/3073—Detection means therefor
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
- D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
- D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
- D03D47/3093—Displaying data
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
- D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
- D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
- D03D47/3026—Air supply systems
- D03D47/3033—Controlling the air supply
- D03D47/304—Controlling of the air supply to the auxiliary nozzles
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Abstract
Provided is a weft yarn flying state detection device in an air jet loom, wherein the optimal jet pressure of a sub-nozzle can be easily set. The control device (16) stores a first curve representing the relationship between the time difference including the first boundary pressure and the injection pressure of the sub-nozzle (15). The control device (16) also stores a second curve that represents the relationship between the average integrated value that includes the second boundary pressure and the injection pressure of the sub-nozzle (15). The display device (16a) displays the first curve and the second curve stored in the control device (16) in parallel.
Description
Technical Field
The present invention relates to a weft flying state detection device in an air jet loom, and more particularly to a weft flying state detection device in an air jet loom for detecting a flying state of a weft inserted through a weft flying path by air injection from a main nozzle and a sub-nozzle.
Background
In the air jet loom, the weft insertion state of the weft yarn is greatly affected by the pressure setting of the compressed air. Conventionally, patent documents 1 and 2 propose a pressure control device for weft insertion in an air jet chamber that can eliminate weft slackening and weft insertion error and reduce the amount of jet fluid consumption.
In patent document 1, a weft unwinding end timing and a weft leading end arrival timing in a weft length measuring and accumulating device are detected, and the injection pressure of a main nozzle is controlled based on the weft leading end arrival timing. Further, the injection pressure of the main nozzle and the injection pressure of the auxiliary nozzle (sub-nozzle) are controlled based on the time difference between the weft yarn leading end arrival timing and the weft yarn unwinding end timing. Specifically, the control is performed such that the injection pressure of the auxiliary nozzle is increased when the time difference between the detected weft yarn leading end arrival timing and the detected weft yarn unwinding end timing is greater than a target value, and the injection pressure of the auxiliary nozzle is decreased when the time difference between the timings is smaller than the target value.
In patent document 2, a sensor for detecting a weft yarn is provided on the main nozzle side of a reed passage (weft flight path), and the straightening timing of the weft yarn is estimated based on an output signal of the sensor. Specifically, the integrated voltage obtained by integrating the output voltage based on the sensor obtained from each weft insertion for each ejection pressure of the sub-nozzle is averaged and the average (integrated) voltage is calculated according to the situation of the weft insertion for a plurality of times. Then, a relationship between the pressure of the sub-nozzle and the average voltage is obtained, a linear approximation formula is derived from the relationship between the pressure of the sub-nozzle and the straightening timing of the weft yarn, which is obtained by visual observation using a stroboscope, and the relationship between the pressure of the sub-nozzle and the average voltage, and the straightening timing is estimated from the average voltage obtained by integration and the linear approximation formula.
Patent document 1: japanese laid-open patent publication No. 4-241135
Patent document 2: japanese patent laid-open publication No. 2016-186144
When weft yarns stored in a weft yarn length measuring and storing device are inserted while flying in a reed passage (weft yarn flying path) by air injection from a main nozzle and an auxiliary nozzle, a part near and behind the leading end of the weft yarn flies in a wave shape while the leading end of the weft yarn reaches a middle position of a predetermined position where the weft insertion is completed. Also, at a time point near the end of weft insertion, the wave shape disappears and weft is inserted in a straightened state.
When determining the optimum jet pressure of the sub-nozzle at the time of weft insertion, the changing point of the time difference (TW-TBW) between the weft yarn leading end arrival timing TW, which is the timing at which the weft yarn leading end arrives at the end of the weft insertion range, and the weft yarn unwinding end timing TBW in the weft yarn length measurement accumulation device becomes a reference. In patent document 2, an optimum jet pressure of the sub-nozzle during weft insertion is determined using a relationship between an integral value obtained by an integration method and a pressure of the sub-nozzle.
The optimum ejection pressure obtained from the change point of the integrated value obtained by the integration method in patent document 2 substantially matches the optimum ejection pressure obtained from the change point of the time difference between the weft yarn leading end arrival timing TW and the weft yarn unwinding end timing TBW. However, the optimum jet pressure obtained in this way is merely a lower limit value indicating a jet pressure at which the slack of the weft yarn occurs when the jet pressure is reduced to the optimum jet pressure or less. Therefore, it is difficult for the operator to determine the extent of the margin with which the injection pressure is set for the lower limit value, only by the injection pressure of the sub-nozzle determined as described above.
Disclosure of Invention
The present invention has been made to solve the above-described problems, and an object thereof is to provide a weft flying state detection device in an air jet loom, which can easily set an optimum jet pressure of a sub-nozzle.
A weft flying state detection device in an air jet loom for solving the above problems detects a flying state of a weft inserted through a weft flying path by air ejected from a main nozzle and a sub-nozzle, the weft flying state detection device in the air jet loom comprising: a balloon sensor for detecting unwinding of the weft from the weft length measuring and accumulating device; a weft sensor disposed on the opposite side of the main nozzle with respect to the center of the weaving width in the weft flight path; a comparison processing unit that compares a weft arrival time obtained based on a weft detection signal of the weft sensor with a weft unwinding time obtained based on a weft unwinding signal of the balloon sensor; a first storage unit that stores a relationship between the time difference and the injection pressure of the sub-nozzle, the relationship including a first boundary pressure that is a boundary between a change region where the time difference obtained by the comparison processing unit is changed with respect to the injection pressure of the sub-nozzle and a stable region where the change in the time difference is stable; a weft-in-knitting-width-range sensor that is provided in the knitting width range and that is disposed closer to the main nozzle than a center of the knitting width in the weft flight path; an integral average processing unit that averages an integral voltage obtained by integrating an output voltage obtained from a weft detection signal of a weft sensor in the weaving width range obtained for each weft insertion for each ejection pressure of the sub nozzle for a plurality of weft insertions; a second storage unit that stores a relationship between the average integrated value and the injection pressure of the sub-nozzle, the relationship including a second boundary pressure that is a boundary between a change region in which the average integrated value obtained by the integral-average processing unit changes with respect to the injection pressure of the sub-nozzle and a stable region in which the change in the average integrated value is stable; and a display unit that displays a graph indicating the relationship between the first storage unit and the second storage unit in parallel.
When the jet pressure of the sub-nozzle is made lower than the first boundary pressure, the possibility that the weft yarn flies in the weft yarn flying path in a state of not being stretched is high, and therefore the first boundary pressure becomes one reference (lower limit value) for determining the optimum jet pressure of the sub-nozzle at the time of weft insertion of the weft yarn.
On the other hand, it is clear that when the injection pressure of the sub-nozzle is made higher than the first boundary pressure, there is a stable region where the amount of change in the average integrated value is stable. Accordingly, it was found that the straightening timing of the weft yarn hardly changes even when the jet pressure of the sub-nozzle is made higher than the second boundary pressure. Therefore, even if the jet pressure of the sub-nozzle is made higher than the second boundary pressure, the straightening timing of the weft yarn in the weft yarn flying path is not advanced, resulting in an unnecessarily increased jet fluid consumption.
The average integrated value obtained by the integrated average processing unit is susceptible to the influence of the injection pressure of the sub-nozzle because the weft sensor detects the yarn runout in the weaving width range on the main nozzle side of the center of the weaving width in the weft flight path. On the other hand, with respect to the time difference determined by the comparison processing unit, the weft sensor disposed on the opposite side of the main nozzle from the center of the weaving width in the weft flight path detects the weft arrival time. Therefore, the time difference includes a difference in the arrival timing of the weft yarn due to a difference in the attitude of the weft yarn flying on the weft yarn flying path, and therefore the degree of influence of the jet pressure of the sub-nozzle is smaller than the average integrated value. Therefore, the influence when the injection pressure of the sub-nozzle is reduced appears earlier than the average integrated value than the time difference, and therefore the first boundary pressure at which the change in the time difference starts is lower than the second boundary pressure at which the change in the average integrated value starts.
In the graph displayed in parallel on the display unit, the range between the first boundary pressure and the second boundary pressure is a preferable injection pressure range of the sub-nozzle for stable and economical flying of the weft yarn. Therefore, by using the graphs displayed in parallel on the display unit, an appropriate margin can be set for the injection pressure of the sub-nozzle in accordance with the difficulty of weft insertion and the like within the injection pressure range of the sub-nozzle, and the injection pressure of the sub-nozzle can be easily set optimally.
In the weft flying state detecting device in the air jet loom, the weft sensor may be provided within the weaving width range. Accordingly, as compared with the case where the weft sensor is disposed outside the weaving width range, the time difference between the weft arrival time based on the weft detection signal of the weft sensor and the weft unwinding time based on the weft unwinding signal of the balloon sensor appears more clearly than the first boundary pressure with respect to the jet pressure of the sub-nozzle, and thus the jet pressure of the sub-nozzle can be set more easily optimally.
In the weft flying state detecting device in the air jet loom, the display unit may be configured to display a pressure recommended in accordance with the type of the weft among pressures between the first boundary pressure and the second boundary pressure. Accordingly, the jet pressure of the sub-nozzle can be appropriately set according to the type of weft yarn.
In the weft flying state detection device in the air jet loom, the display unit may be configured to display a pressure recommended in accordance with a rotation speed of the loom, among pressures between the first boundary pressure and the second boundary pressure. Accordingly, the injection pressure of the sub-nozzle can be appropriately set according to the rotation speed of the loom.
According to the present invention, the optimum injection pressure of the sub-nozzle can be easily set.
Drawings
Fig. 1 is a schematic diagram showing a weft insertion device of an air jet loom according to an embodiment.
In fig. 2, (a) is a diagram showing arrangement positions of the end sensor and the weft sensors in the first weaving width range with respect to the weaving width, and (b) is a diagram showing various timings.
Fig. 3 is a graph showing a relationship between the jet pressure of the sub-nozzle and a time difference Δ between the weft yarn intermediate arrival time and the weft yarn unwinding time.
Fig. 4 is a diagram showing waveforms of signal voltages detected by the weft sensors in the second weaving width range.
Fig. 5 is a diagram showing a relationship between the injection pressure of the sub-nozzle and the average integrated value.
Fig. 6 is a diagram showing a state in which the first curve and the second curve are displayed in parallel on the display device.
Description of reference numerals
Y … weft yarn; 13 … weft length measuring and storing device; 14a … weft yarn flight path; 15 … secondary nozzle; 16 … is a control device functioning as a comparison processing unit, a first storage unit, an integral average processing unit, and a second storage unit; 16a … as a display unit; 19 … balloon sensor; 22 … primary nozzle; 25 … as weft yarn sensors in the first weaving width range of weft yarn sensors.
Detailed Description
Hereinafter, an embodiment of a weft yarn flying state detection device in an air jet loom will be described with reference to fig. 1 to 6. In the following description, the weft insertion direction in which a weft is inserted into a warp opening and conveyed is defined as upstream on the side opposite to the weft insertion direction and downstream on the weft insertion direction side.
As shown in fig. 1, the weft insertion device 10 includes: weft insertion nozzle 11, yarn feeder 12, weft length measuring and accumulating device 13, reed 14, a plurality of sub-nozzles 15, and controller 16. A display device 16a having a display function and an input function is attached to the control device 16.
The yarn feeder 12 is disposed upstream of the weft insertion nozzle 11. The weft yarn Y in the yarn supplying portion 12 is drawn out by rotation of a winding arm (not shown) of the weft yarn length measuring and accumulating device 13, and accumulated in a state of being wound around the accumulation drum 17.
The weft yarn length measuring and storing device 13 is provided with a weft yarn locking pin 18 and a balloon sensor 19 for detecting the unwinding of the weft yarn Y from the weft yarn length measuring and storing device 13. The weft yarn locking pin 18 and the balloon sensor 19 are disposed around the storage drum 17. The balloon sensor 19 is arranged side by side with respect to the weft yarn catching pin 18 in the unwinding direction of the weft yarn Y. The weft yarn catching pin 18 is electrically connected to the control device 16. The weft yarn catching pin 18 unwinds the weft yarn Y stored in the storage drum 17 at a loom rotation angle preset in the control device 16. The weft yarn Y is unwound by the weft yarn locking pin 18 at the weft insertion start timing.
The balloon sensor 19 is electrically connected to the control device 16. The balloon sensor 19 detects the weft yarn Y unwound from the accumulating drum 17 during weft insertion and sends a weft unwinding signal to the control device 16. Upon receiving the weft unwinding signal of the preset number of turns (three times in the present embodiment), the control device 16 operates the weft yarn locking pin 18. The weft yarn catching pin 18 catches the weft yarn Y unwound from the storage drum 17, and the weft insertion is completed.
In addition, the operating timing of the weft yarn locking pin 18 for locking the weft yarn Y is set in accordance with the number of winding turns required for storing the weft yarn Y having a length corresponding to the knitting width TL in the storage drum 17. In the present embodiment, the length of the weft yarn Y wound three times around the storage drum 17 corresponds to the knitting width TL, and therefore the control device 16 is set to transmit an operation signal for locking the weft yarn Y to the weft yarn locking pin 18 upon receiving a weft unwinding signal from the tertiary balloon sensor 19. The weft detection signal of the balloon sensor 19 is an unwinding signal of the weft yarn Y from the storage drum 17, and the control device 16 recognizes the weft unwinding timing based on the loom rotation angle signal obtained from the encoder 20.
The weft insertion nozzle 11 has a tandem nozzle 21 that draws out the weft yarn Y of the accumulating drum 17 and a main nozzle 22 that inserts the weft yarn Y to a weft yarn flying path 14a of the reed 14. A brake 23 for braking the flying weft yarn Y before the end of weft insertion is provided upstream of the tandem nozzle 21.
The main nozzle 22, the sub-nozzle 15, and the reed 14 are arranged on a slay (not shown) and reciprocally swing in the front-rear direction of the air jet loom. The tandem nozzle 21, the brake 23, the weft length measuring and accumulating device 13, and the yarn feeder 12 are fixed to a frame (not shown) of the air jet loom or a bracket (not shown) attached to a floor (not shown).
An end sensor 24 is disposed downstream of the weft flight path 14 a. The finish sensor 24 is disposed downstream of the knitting width TL. Therefore, the end sensor 24 is disposed outside the range of the knitting width TL. Then, the end sensor 24 detects the weft yarn Y that arrives. The end sensor 24 is electrically connected to the control device 16. The control device 16 detects whether or not a weft insertion failure occurs based on the presence or absence of the weft detection signal of the end sensor 24. The weft detection signal of the end sensor 24 is an arrival signal of the weft Y, and is recognized as the weft insertion end time IE in the control device 16 based on the loom rotation angle signal obtained from the encoder 20.
A first weft yarn sensor 25 in the weaving width range is disposed on the weft yarn flight path 14a in the weaving width TL on the upstream side of the end sensor 24. The weft sensor 25 in the first weaving width range is a weft sensor disposed on the opposite side of the main nozzle 22 from the center of the weaving width TL in the weft flight path 14 a. The weft sensor 25 in the first weaving width range is electrically connected to the control device 16. The weft detection signal of the weft sensor 25 in the first weaving width range IS recognized in the control device 16 as the weft intermediate arrival time IS at which the leading end of the weft Y inserted reaches the position where the weft sensor 25 in the first weaving width range IS disposed, based on the loom rotation angle signal obtained from the encoder 20.
The weft sensor 25 in the first weaving width range includes a light projecting optical fiber and a light receiving optical fiber. When the air jet loom is driven, light is emitted from the light projecting optical fiber of the weft sensor 25 in the first weaving width range toward the weft flight path 14a, and light reflected by the reed 14 and the weft Y is received by the light receiving optical fiber. The light received by the light receiving fiber is input to a fiber amplifier (japanese: フィラアンプ) (not shown). The optical fiber amplifier receives the input light by a photodiode serving as a light receiving unit, converts the light into an electric signal, amplifies the converted electric signal, and outputs the amplified electric signal to the control device 16.
The main air tank 26 is connected to a common air compressor 31 provided at the textile factory via a main pressure gauge 27, a main regulator 28, a raw pressure gauge 29, and a filter 30. The main air tank 26 stores compressed air supplied from an air compressor 31 and adjusted to a set pressure by a main regulator 28. The pressure of the compressed air supplied to the main air tank 26 is constantly detected by the main pressure gauge 27.
As an example, the sub-nozzles 15 are divided into six groups, and each group is composed of four sub-nozzles 15. Six sub-valves 32 are provided corresponding to each group, and the sub-nozzles 15 of each group are connected to each sub-valve 32 via a pipe 33. Each sub-valve 32 is connected to a common sub-air tank 34.
The sub air tank 34 is connected to a sub regulator 36 via a sub pressure gauge 35. The sub-regulator 36 is connected to a pipe 28a connecting the main pressure gauge 27 and the main regulator 28 via a pipe 36 a. The sub-air tank 34 stores compressed air supplied from the air compressor 31 and adjusted to a set pressure by the sub-regulator 36. The pressure of the compressed air supplied to the sub air tank 34 is constantly detected by the sub pressure gauge 35.
The main valve 22v, the series valve 21v, the sub valve 32, the original pressure gauge 29, the main pressure gauge 27, the sub pressure gauge 35, and the brake 23 are electrically connected to the control device 16. The control device 16 is preset with operation timings and operation periods for operating the main valve 22v, the series valve 21v, the sub-valve 32, and the brake 23. The control device 16 receives detection signals from the original pressure gauge 29, the main pressure gauge 27, and the sub pressure gauge 35.
At a time earlier than the weft insertion start time at which the weft engagement pin 18 operates, the control device 16 outputs an operation command signal to the main valve 22v and the tandem valve 21v, and injects compressed air from the main nozzle 22 and the tandem nozzle 21. The control device 16 outputs an operation command signal to the brake 23 at a timing earlier than the weft insertion end timing IE at which the weft engagement pin 18 is actuated to engage the weft yarn Y of the accumulating drum 17. The brake 23 brakes the weft Y flying at a high speed to reduce the flying speed of the weft Y, thereby alleviating the impact of the weft Y at the weft insertion end time IE.
Fig. 2 (a) shows the arrangement positions of the end sensor 24 and the weft sensor 25 in the first weaving width range with respect to the weaving width TL. Fig. 2 (B) shows the weft unwinding times B1, B2, B3 of the balloon sensor 19, the weft intermediate arrival time IS of the weft sensor 25 in the first weaving width range, the weft insertion end time IE of the end sensor 24, and the brake start time BT of the brake 23.
In fig. 2 (a), the positions L, 2L, and 3L represent the leading end positions of the weft yarn Y at the weft yarn accumulation lengths corresponding to the amount of one winding, two windings, and three windings on the accumulation drum 17. When the weft yarn Y flies without slackening, the leading end of the weft yarn Y is located at the positions L, 2L, and 3L at the weft unwinding times B1, B2, and B3 when the first, second, and third weft unwinding signals are generated in the balloon sensor 19. Therefore, in the following description, the positions L, 2L, and 3L are referred to as ideal weft leading end positions.
In fig. 2 (B), the weft unwinding timings B1, B2, B3 show the loom rotation angles based on the first, second, and third weft unwinding signals in the balloon sensor 19, respectively. The loom rotation angle can be grasped from the rotation angle signal of the encoder 20 when the weft unwinding signal is generated. Hereinafter, the loom rotation angle at each time is similarly grasped from the rotation angle signal of the encoder 20.
The weft insertion end time IE shows the loom rotation angle at the time of generation of the weft detection signal obtained by the end sensor 24. The brake start time BT is a loom rotation angle preset in the control device 16 so that the braking of the weft yarn Y is started before the weft insertion end time IE.
The first weft sensor 25 in the weaving width range is provided upstream in the weft insertion direction from the leading end position BL of the weft Y corresponding to the brake start time BT at which the brake 23 starts operating during weft insertion, that is, upstream in the weft insertion direction from the leading end position BL of the weft Y in the weaving width TL estimated from the brake start time BT and the speed of the weft Y.
In the present embodiment, the first weaving width range weft sensor 25 is provided at the ideal weft leading end position 2L, and the distance from the ideal weft leading end position 2L to the weaving end of the weaving width TL corresponds to the weft accumulation length of the accumulation drum 17 wound by two turns. In the case where the weft yarn Y flies without slackening, the weft yarn Y reaches the ideal weft yarn leading end position 2L at the weft unwinding time B2, and therefore the weft yarn intermediate arrival time IS detected by the weft yarn sensor 25 in the first weaving width range should ideally coincide with the weft unwinding time B2. However, in the case where the jet pressure of the sub-nozzle 15 IS low and the conveyance performance of the sub-nozzle 15 IS weaker than the weft unwinding performance of the weft insertion nozzle 11, the weft yarn Y slackens during flight, and therefore the weft intermediate arrival time IS delayed by an amount corresponding to the time difference Δ between this time IS and the weft unwinding time B2.
The control device 16 compares the weft yarn intermediate arrival time IS with the weft yarn unwinding time B2 to determine a time difference Δ. Therefore, in the present embodiment, the control device 16 functions as a comparison processing unit that compares the weft intermediate arrival time IS, which IS the weft arrival time obtained based on the weft detection signal of the weft sensor 25 in the first weaving width range, with the weft unwinding time B2 obtained based on the weft unwinding signal of the balloon sensor 19.
By observing the magnitude of the time difference Δ between the weft yarn intermediate arrival time IS and the weft yarn unwinding time B2, the flying state of the weft yarn Y during weft insertion can be grasped. The second weft unwinding time B2 is the weft unwinding time adjacent to and before the brake start time BT of the brake 23. Therefore, the weft sensor 25 in the first weaving width range can detect the flying state of the weft Y without being affected by the braking action of the brake 23.
Various fabric conditions and weaving conditions are registered and stored in the control device 16. The weaving conditions include, for example, the weft type such as the material and the count of the yarn used for the weft Y, the weft density, the warp type such as the material and the count of the yarn used for the warp, the warp density, the weaving width, and the weave structure. The weaving conditions include, for example, the rotational speed of the loom, the pressure of the compressed air in the main air tank 26 and the sub air tank 34, the opening degrees of the main valve 22v and the series valve 21v, the weft insertion start time, the target weft insertion end time, and the like.
Next, a method of setting the jet pressure of the sub-nozzle 15 to the optimum pressure will be described as an example of the control of the weft insertion device 10 by monitoring the flying state of the weft yarn based on the time difference Δ between the weft yarn intermediate arrival time IS and the weft yarn unwinding time B2.
A first curve AD1 shown in fig. 3 IS a curve showing the relationship between the jet pressure of the sub-nozzle 15 and the time difference Δ between the weft yarn intermediate arrival time IS and the weft yarn unwinding time B2. The first curve AD1 IS obtained by plotting the time difference Δ between the weft intermediate arrival time IS and the weft unwinding time B2 when the injection pressure of the sub-nozzle 15 IS changed variously in high and low while the injection pressure of the weft insertion nozzle 11 IS adjusted and the weft insertion end time IE IS kept constant.
As indicated by the first curve AD1, a first change point X1 indicating a first boundary pressure P1 is clearly present, and the first boundary pressure P1 is a boundary between a change region where the time difference Δ obtained by the control device 16 changes with respect to the injection pressure of the sub-nozzle 15 and a stable region where the change in the time difference Δ is stable. Further, the "variation region" is a region in which the amount of variation in the time difference Δ (offset angle) with respect to the injection pressure of the sub-nozzle 15 is increased, as compared with the "steady region". The first boundary pressure P1 is a reference (lower limit value) for determining an optimal jet pressure of the sub-nozzle 15 when the weft yarn Y is inserted.
The first curve AD1 is stored in the control device 16. Therefore, in the present embodiment, the controller 16 also functions as a first storage unit that stores the relationship between the time difference Δ including the first boundary pressure P1 and the injection pressure of the sub-nozzle 15.
As shown in fig. 1, in the weft yarn flight path 14a within the weaving width TL, a second in-weaving width weft yarn sensor 45 is disposed on the main nozzle 22 side with respect to the center of the weaving width TL. The weft sensor 45 in the second weaving width range is electrically connected to the control device 16. Further, as a hardware configuration, between the second weaving width range weft sensor 45 and the control device 16, an optical fiber amplifier 46, a band pass filter 47, a full-wave rectifier circuit 48, an averaging circuit 49, an integrating circuit 50, and an a/D converter 51 are provided in this order from the second weaving width range weft sensor 45 side.
The weft sensor 45 in the second weaving width range includes a light projecting optical fiber and a light receiving optical fiber. When the air jet loom is driven, light is emitted from the light projecting optical fiber of the weft sensor 45 in the second weaving width range toward the weft flight path 14a, and light reflected by the reed 14 and the weft Y is received by the light receiving optical fiber. The light received by the light receiving optical fiber is input to the optical fiber amplifier 46. The optical fiber amplifier 46 receives the input light by a photodiode serving as a light receiving unit, converts the light into an electric signal, amplifies the converted electric signal, and outputs the amplified electric signal to the band-pass filter 47.
As indicated by a waveform W1 in fig. 4, a state is shown in which the higher the value of the signal voltage detected by the weft sensor 45 in the second weaving width range, the larger the yarn runout of the weft yarn Y. The control device 16 integrates the output voltage obtained based on the weft detection signal after passing through the band-pass filter 47, the full-wave rectifier circuit 48, and the averaging circuit 49 in real time by the integrating circuit 50 for each weft insertion, and stores the integrated voltage during the integration period, that is, during the period from the start of weft passage to the end of weft insertion.
Next, the controller 16 averages the integrated voltages obtained from a plurality of (e.g., 100) picks for each ejection pressure of the sub-nozzle 15 to obtain an average integrated value. Therefore, in the present embodiment, the control device 16 also functions as an integral-average processing unit that averages an integral voltage obtained by integrating an output voltage based on a weft detection signal of the weft sensor 45 in the second weaving width range obtained from each weft insertion for each injection pressure of the sub-nozzle 15. Next, the controller 16 determines the relationship between the injection pressure of the sub-nozzle 15 and the average voltage, that is, the average integrated value.
As indicated by the second curve AD2 in fig. 5, the relationship between the injection pressure of the sub-nozzles 15 and the average integrated value (average voltage) can be obtained. Here, the second change point X2 indicating the second boundary pressure P2 clearly exists, and the second boundary pressure P2 is the boundary between the change region where the average integrated value obtained by the control device 16 changes with respect to the injection pressure of the sub-nozzles 15 and the stable region where the change in the average integrated value is stable. Further, the "variation region" is a region in which the average integrated value increases with respect to the amount of variation in the injection pressure of the sub-nozzles 15, as compared with the "steady region". It is also clear that the straightening timing of the weft yarn Y hardly changes even if the jet pressure of the sub-nozzle 15 is made higher than the second boundary pressure P2.
The second curve AD2 is stored in the control device 16. Therefore, in the present embodiment, the controller 16 also functions as a second storage unit that stores a relationship between the average integrated value of the second boundary pressure P2 and the injection pressure of the sub-nozzle 15.
As shown in fig. 6, the controller 16 displays the first curve AD1 and the second curve AD2 in parallel on the display device 16 a. Therefore, in the present embodiment, the display device 16a is a display unit that displays the first curve AD1 and the second curve AD2 as graphs in parallel.
The display device 16a is configured to display recommended pressure for the type of weft yarn Y, of the pressures between the first boundary pressure P1 and the second boundary pressure P2. The display device 16a is configured to indicate a pressure recommended in accordance with the rotational speed of the loom, from among pressures between the first boundary pressure P1 and the second boundary pressure P2.
The control device 16 controls the display device 16a such that the display device 16a indicates the recommended pressure depending on the type of weft yarn Y with a. For example, in the case where the weft yarn Y is relatively thin, the control device 16 controls the display device 16a to indicate the lower pressure Pa of the pressures between the first boundary pressure P1 and the second boundary pressure P2. For example, when the weft yarn Y is relatively thick, the controller 16 controls the display device 16a to indicate the intermediate pressure Pb of the pressures between the first boundary pressure P1 and the second boundary pressure P2. In addition, for example, in the case where the weft yarn Y is a twisted yarn, the control device 16 controls the display device 16a so as to indicate the higher pressure Pc of the pressures between the first boundary pressure P1 and the second boundary pressure P2.
In addition, the control device 16 controls the display device 16a such that the display device 16a indicates the recommended pressure depending on the rotational speed of the weaving machine with a value of a. For example, in the case where the rotation speed of the loom is small, the control device 16 controls the display device 16a to indicate the lower pressure Pa of the pressures between the first boundary pressure P1 and the second boundary pressure P2. In addition, for example, in the case where the rotation speed of the loom is large, the control device 16 controls the display device 16a so as to indicate the higher pressure Pc among the pressures between the first boundary pressure P1 and the second boundary pressure P2.
Next, the operation of the present embodiment will be explained.
If the injection pressure of the sub-nozzle 15 is made lower than the first boundary pressure P1, the weft yarn Y is more likely to fly in the weft yarn flying path 14a in a state where the weft yarn Y is not stretched straight. Therefore, the first boundary pressure P1 is one of the criteria (lower limit value) for determining the optimum jet pressure of the sub-nozzle 15 at the time of weft insertion of the weft yarn Y. On the other hand, even if the jet pressure of the sub-nozzle 15 is made higher than the second boundary pressure P2, there is no case where the timing at which the weft yarn Y straightens in the weft yarn flight path 14a is continuously advanced, thus resulting in an unnecessarily increased jet fluid consumption amount.
The average integrated value obtained by the control device 16 is easily affected by the injection pressure of the sub-nozzle 15 because the weft sensor 45 in the second weaving width range disposed closer to the main nozzle 22 than the center of the weaving width TL in the weft flight path 14a detects the yarn runout. On the other hand, with respect to the time difference Δ obtained by the control device 16, the weft yarn intermediate arrival time IS detected by the weft yarn sensor 25 in the first weaving width range disposed on the opposite side of the main nozzle 22 from the center of the weaving width TL in the weft flight path 14 a. Therefore, the time difference Δ includes a difference in the weft yarn intermediate arrival time IS due to a difference in the attitude of the weft yarn Y flying through the weft yarn flying path 14a, and therefore the degree of influence of the jet pressure of the sub-nozzle 15 IS smaller than the average integrated value. Therefore, the influence when the injection pressure of the sub-nozzle 15 is reduced appears earlier than the average integrated value than the time difference Δ, and therefore the first boundary pressure P1 is lower than the second boundary pressure P2.
In the graphs displayed in parallel by the display device 16a, that is, the first curve AD1 and the second curve AD2, a range between the first boundary pressure P1 and the second boundary pressure P2 is a preferable injection pressure range of the sub-nozzle 15 for stably and economically flying the weft yarn Y. Therefore, the operator can confirm the first curve AD1 and the second curve AD2 displayed in parallel on the display device 16a, and set an appropriate margin in the injection pressure of the sub-nozzle 15 in accordance with the ease of weft insertion and the like within the injection pressure range of the sub-nozzle 15, thereby making it possible to easily perform the optimum setting of the injection pressure of the sub-nozzle 15.
In the above embodiment, the following effects can be obtained.
(1) The control device 16 stores a first curve AD1 representing the relationship between the time difference Δ including the first boundary pressure P1 and the injection pressure of the sub-nozzle 15. In addition, the control device 16 stores a second curve AD2 that represents the relationship between the average integrated value including the second boundary pressure P2 and the injection pressure of the sub-nozzle 15. The display device 16a then displays the first curve AD1 and the second curve AD2 stored in the control device 16 in parallel. In the first curve AD1 and the second curve AD2 displayed in parallel by the display device 16a, a range between the first boundary pressure P1 and the second boundary pressure P2 is a preferable injection pressure range of the sub-nozzle 15 for stably and economically flying the weft yarn Y. Therefore, the operator can easily set the injection pressure of the sub-nozzle 15 to the optimum value by setting an appropriate margin for the injection pressure of the sub-nozzle 15 in accordance with the ease of weft insertion and the like in the injection pressure range of the sub-nozzle 15 based on the first curve AD1 and the second curve AD2 displayed in parallel on the display device 16 a.
(2) The weft sensor 25 in the first weaving width range is disposed in the weaving width TL range. Accordingly, the time difference Δ between the weft yarn intermediate arrival time IS obtained based on the weft yarn detection signal of the weft yarn sensor 25 in the first weaving width range and the weft yarn unwinding time B2 obtained based on the weft yarn unwinding signal of the balloon sensor 19 IS more clearly represented with respect to the first boundary pressure P1 with respect to the injection pressure of the sub-nozzle 15, and thus the injection pressure of the sub-nozzle 15 can be more easily optimally set.
(3) The display device 16a is configured to display a recommended pressure according to the type of the weft yarn Y, of the pressures between the first boundary pressure P1 and the second boundary pressure P2. Accordingly, the jet pressure of the sub-nozzle 15 can be appropriately set according to the type of the weft yarn Y.
(4) The display device 16a is configured to display a pressure recommended in accordance with the rotational speed of the loom, of the pressures between the first boundary pressure P1 and the second boundary pressure P2. Accordingly, the injection pressure of the sub-nozzle 15 can be appropriately set according to the rotation speed of the loom.
The above embodiment may be modified as follows.
In the embodiment, the weft sensor 25 in the first weaving width range may be deleted. The control device 16 may also compare the weft arrival time obtained from the weft detection signal of the end sensor 24 with the weft unwinding time obtained from the weft unwinding signal of the balloon sensor 19 to obtain a time difference. The end sensor 24 is a weft sensor disposed on the opposite side of the main nozzle 22 from the center of the weaving width TL in the weft flight path 14 a.
In the embodiment, the display device 16a is configured to indicate the recommended pressure depending on the type of the weft yarn Y by using "tangle-solidup", but the present invention is not limited thereto, and for example, the display device 16a may be configured to display the recommended pressure depending on the type of the weft yarn Y by using a numerical value.
In the embodiment, the display device 16a is configured to indicate the recommended pressure in accordance with the rotation speed of the loom by using "tangle-solidup", but the present invention is not limited thereto, and for example, the display device 16a may be configured to display the recommended pressure in accordance with the rotation speed of the loom by using a numerical value.
In the embodiment, the display device 16a may not be configured to display the recommended pressure according to the type of the weft yarn Y.
In the embodiment, the display device 16a may not be configured to display the pressure recommended in accordance with the rotation speed of the loom.
Claims (4)
1. A weft flying state detection device in an air jet loom, which detects the flying state of a weft inserted through a weft flying path by air injection from a main nozzle and an auxiliary nozzle, is characterized by comprising:
a balloon sensor that detects unwinding of the weft yarn from the weft yarn length measuring and accumulating device;
a weft sensor disposed on a side opposite to the main nozzle with respect to a center of a weaving width in the weft flight path;
a comparison processing unit that compares a weft arrival time obtained based on a weft detection signal of the weft sensor with a weft unwinding time obtained based on a weft unwinding signal of the balloon sensor;
a first storage unit that stores a first curve that represents a relationship between a time difference and an injection pressure of the sub-nozzle and that includes a first boundary pressure that is a boundary between a change region in which the time difference obtained by the comparison processing unit changes with respect to the injection pressure of the sub-nozzle and a stable region in which the change in the time difference is stable;
a weft-in-knitting-width-range weft sensor that is provided in the knitting width range and that is arranged on the main nozzle side of the center of the knitting width in the weft flight path;
an integral average processing unit that averages an integral voltage obtained by integrating an output voltage obtained from a weft detection signal of a weft sensor in the weaving width range obtained for each weft insertion for each ejection pressure of the sub nozzle for a plurality of weft insertions;
a second storage unit that stores a second curve that represents a relationship between an average integrated value and the injection pressure of the sub-nozzle and that includes a second boundary pressure that is a boundary between a change region in which the average integrated value obtained by the integration average processing unit changes with respect to the injection pressure of the sub-nozzle and a stable region in which the change in the average integrated value is stable; and
and a display unit configured to display a first curve and a second curve in parallel, the first curve and the second curve being stored in the first storage unit and the second storage unit.
2. The weft flying-state detecting device in an air-jet loom according to claim 1,
a weft sensor is disposed in the weft flight path on the opposite side of the main nozzle with respect to the center of the weaving width, and is disposed within the weaving width range.
3. The weft flying-state detecting device in an air-jet loom according to claim 1 or 2,
the display unit is configured to display a recommended pressure for the weft yarn type, among the pressures between the first boundary pressure and the second boundary pressure.
4. The weft flying-state detecting device in an air-jet loom according to claim 1 or 2,
the display unit is configured to display a pressure recommended in accordance with a rotation speed of the loom, among pressures between the first boundary pressure and the second boundary pressure.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016224931A JP6558348B2 (en) | 2016-11-18 | 2016-11-18 | Weft running state detection device for air jet loom |
| JP2016-224931 | 2016-11-18 |
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| CN108070949A CN108070949A (en) | 2018-05-25 |
| CN108070949B true CN108070949B (en) | 2020-10-16 |
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| EP (1) | EP3323920B1 (en) |
| JP (1) | JP6558348B2 (en) |
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| CN109457371A (en) * | 2019-01-17 | 2019-03-12 | 王安俭 | For adjusting the device and method of the eject position of pilot jet in air-jet loom |
| JP7351184B2 (en) * | 2019-11-05 | 2023-09-27 | 株式会社豊田自動織機 | Air jet loom control device |
| JP7359049B2 (en) * | 2020-03-17 | 2023-10-11 | 株式会社豊田自動織機 | Air jet loom weft brake control device |
| JP7415904B2 (en) * | 2020-12-08 | 2024-01-17 | 株式会社豊田自動織機 | Air jet loom weft insertion control device |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3276123D1 (en) * | 1982-12-24 | 1987-05-27 | Sulzer Ag | Device for operating an air jet loom |
| JP2516353B2 (en) * | 1987-01-30 | 1996-07-24 | 津田駒工業株式会社 | Side-loading control device for air-loom loom |
| US5127445A (en) * | 1990-10-04 | 1992-07-07 | Nissan Motor Company Limited | Automatic gaiting arrangement for a fluid jet loom |
| JP2701545B2 (en) | 1990-12-29 | 1998-01-21 | 株式会社豊田自動織機製作所 | Pressure controller for weft insertion in jet loom |
| CN1069302A (en) * | 1991-08-12 | 1993-02-24 | 日产自动车株式会社 | Fluid jet loom and method of operating thereof |
| JPH05171542A (en) * | 1991-12-24 | 1993-07-09 | Nissan Motor Co Ltd | Loom controller |
| JP3044897B2 (en) * | 1992-01-28 | 2000-05-22 | 株式会社豊田自動織機製作所 | Weft insertion method in jet loom |
| JP2004052171A (en) * | 2002-07-22 | 2004-02-19 | Tsudakoma Corp | Method for controlling weft inserting in air-jet loom |
| JP5508451B2 (en) * | 2012-02-10 | 2014-05-28 | 株式会社豊田中央研究所 | Weft insertion device in jet loom |
| JP6367784B2 (en) * | 2015-03-27 | 2018-08-01 | 株式会社豊田自動織機 | Weft detection device for air jet loom |
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2016
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| CN108070949A (en) | 2018-05-25 |
| JP2018080426A (en) | 2018-05-24 |
| EP3323920B1 (en) | 2019-09-11 |
| JP6558348B2 (en) | 2019-08-14 |
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