KR940010634B1 - Fluid jet loom and method of operating same - Google Patents

Abstract

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Description

Fluid jet looms and how they work

1 is a block diagram illustrating the principles of the present invention.

2 is a schematic view showing a first embodiment of a fluid jet loom according to the present invention.

FIG. 3a is a time chart showing a method of operation for the loom of FIG. 2 in normal weaving operation.

FIG. 3b is a time chart showing another method of operation for the loom of FIG. 2 in inching operation.

4A to 4C are time charts showing control signals for controlling the operation method of FIGS. 3A and 3B, wherein FIG. 4A is a chart showing an auxiliary control signal for the loom spindle rotation angle, and FIG. 4B is a loom spindle A chart representing a normal control signal for a rotation angle, and 4c or a chart for a false control signal over time.

5 is a first half of a flow chart showing weft picking state setting control for a first embodiment of a fluid jet loom.

6 is the second half of the flowchart showing the weft picking state setting control for the first embodiment of the fluid jet loom.

7 is a graph showing the setting of the air release time of the auxiliary nozzle in the first embodiment of the fluid jet loom associated with the flight of the weft yarn.

8 is a graph illustrating a method of controlling the air release time of a main nozzle in a first embodiment of a fluid jet loom associated with the flight of weft yarns.

9 is a graph showing the linearity of the personnel feed rate of the weft yarn picked in the first embodiment of the fluid jet loom.

10 is a graph showing the difference between arrival and release times in terms of air release pressure of an auxiliary nozzle in a first embodiment of a fluid jet loom.

11 is a flowchart of weft picking state setting control for a second embodiment of a fluid jet loom according to the present invention.

12 is a graph showing the flight state of the picked weft yarn associated with the second embodiment of the fluid jet loom.

13 is a graph showing the weft feed (main nozzle) characteristics associated with the first and second embodiments of a fluid jet loom.

14 is a flowchart of weft picking state setting control for a third embodiment of a fluid jet loom.

FIG. 15 is a graph showing the difference between arrival and release times in terms of air release pressure of a nozzle in relation to a third embodiment of a fluid jet loom.

FIG. 16 is a schematic diagram showing a modified state of the first embodiment of the fluid jet loom. FIG.

FIG. 17 is a graph showing weft feed (main nozzle) characteristics similar to those of FIG. 13 as a fourth embodiment of a fluid jet loom according to the present invention.

18 is a schematic view showing a fifth embodiment of a fluid jet loom according to the present invention.

19 is a diagram illustrating the operation of the weft type selection means used in the fluid jet loom of FIG. 18. FIG.

20 is a graph used to calculate the weft feed (main nozzle) characteristics of the fourth and fifth embodiments of a fluid jet loom.

21 is a schematic view showing a sixth embodiment of a fluid jet loom according to the present invention.

22 is a flow chart for weft picking state setting control for a sixth embodiment of a fluid jet loom.

FIG. 23 is a graph showing a method of controlling the air release time of an auxiliary nozzle for a sixth embodiment of a fluid jet loom associated with the flight of picked weft yarn.

FIG. 24 is a graph similar to FIG. 23, but showing a method of controlling the air release time different from the fluid jet loom.

FIG. 25 is a graph similar to FIG. 23, but showing a method of controlling the air release time different from the sixth embodiment of the fluid jet loom.

FIG. 26 is a graph similar to FIG. 23, but showing a method of controlling air release time different from the sixth embodiment of a fluid jet loom.

* Explanation of symbols for main parts of the drawings

1: Main nozzle 3,17: Voltage-pressure proportional valve

5,19: electromagnet valve 7: phase measurement and storage device

8: hollow rotating shaft 9: drum

10: weft winding arm 11: electromagnet actuator

12: weft support pin 16: auxiliary nozzle

18: surge tank 20: controller

21: angle sensor 22: weft loosening sensor

23: weft arrival sensor 24: input means

25: driver

TECHNICAL FIELD The present invention relates to a fluid jet loom and a method of operating the same, and more particularly, to a control apparatus and a method for fixing the loom to an appropriate weft picking state in which weft yarns are picked so that weft picking is effectively performed.

In an air jet loom, weft yarns are usually protruded or inserted from the main or weft insert nozzle into the shed of the warp yarns and are transported through the weft guide channel of the warp openings under the influence of high pressure air emitted from the plurality of auxiliary nozzles. Picking is done. That is, the weft picking is carried out by the air classification formed by the released air. At the start of the loom, weft picking is performed by releasing air at a predetermined air release pressure and adjusting the time from the main nozzle and the auxiliary nozzle. However, the drag properties of air powdered milk against weft yarns depend on the preservation state and type of yarn and / or the like, which leads to the possibility that the weft yarns do not reach the counter weft picking side of the loom and the weft yarns break.

In this regard, up to now, the loom operator observes the state or characteristics of the picked weft yarn to change the air discharge pressure and air release timing of the main nozzle and the auxiliary nozzle multiple times so that the weft yarn can reach the counter weft picking side. Weft setting conditions have been set.

After completing the weaving preparation by performing the weft picking state setting operation described above, for example, a measurement value of the weft arrival time in the weft yarn (provided from the main nozzle) by the air discharge pressure of the main nozzle (to be supplied to the main nozzle) Normal operation is initiated by operating an automatic weft picking control system that is controlled according to the difference between and the target value.

However, the above-described prior art has the following disadvantages. In the prior art, as the weaving preparation of the loom is completed, the loom operator performs a complicated task based on his own experience and discriminating power before the automatic weft picking control is made. As a result, quite a long time is required to prepare the weaving work. In order to remedy the above drawbacks, the following method has been proposed. That is, the yarn stores or stores the main nozzle air discharge pressure and the like according to the type in advance as data, and reads the air discharge pressure and the like at the start of the loom and sets it as a control parameter of the loom operation. However, even with this method, the drag characteristics for the weft yarns depend on the yarn's preservation state and the location of the weft measurement and storage device even when the yarns are of the same type. Therefore, even with the above method, it is difficult to properly set the weft picking state and a long time is required to complete the weaving preparation.

It is an object of the present invention to provide an improved fluid jet loom and a method of operating the loom that can effectively overcome the drawbacks of the prior art.

It is a further object of the present invention to provide an improved fluid jet compactor and a method of operating the loom that can greatly shorten the time required to commence normal weaving operation.

It is yet another object of the present invention to provide proper weft picking regardless of the type of yarn, the state of yarn preservation, and / or the weft measurement and storage arrangement without the need for the operator to rely on his experience and judgment to make complicated loom preparation work. It is to provide an improved fluid jet loom that can set the state and a method of operating the loom.

A fluid jet loom L according to one aspect of the invention is shown in FIG. 1 in the figure. The fluid jet loom L comprises a nozzle 1 for inserting the weft yarn into the opening of the warp yarn under the influence of the fluid discharged through the nozzle to perform weft picking. A first means M1 is provided for detecting the release time data of the inserted weft yarn in accordance with the pressure change of the fluid discharged through the nozzle. Second means M2 is also provided for calculating nozzle characteristics in accordance with the detected data. Further, third means M3 for setting the weft picking state in accordance with the nozzle characteristics is also provided.

"Unwinding time" means the time for which the adjusting length of the weft yarn is discharged from the weft measuring and storage device in the weft picking process.

According to another aspect of the present invention, a method is provided for operating a fluid jet loom having a nozzle for inserting the weft yarn into the opening of the warp yarn under fluid pressure discharged through the nozzle to perform weft picking. The method detects the loosening time data of the inserted weft yarn according to the pressure change of the fluid discharged through the nozzle, calculates the nozzle characteristics according to the detected data, and sets the weft picking state according to the nozzle characteristics. It involves a series of consecutive steps.

The control apparatus and method of the present invention noted that the discharge pressure of the nozzle and the release time of the weft yarn are unconditionally determined. Using this fact, the nozzle properties are first calculated (which is the nozzle air release pressure over the release time). Then, weft picking conditions such as nozzle air release pressure, nozzle air release timing, and the like are set so that the picked weft yarns fly properly and are guided through the weft guide channel. Therefore, according to the present invention, an appropriate value of the weft picking state can be set smoothly and automatically. Thus, the operating time of the loom operation and the number of operating steps are greatly reduced. In addition, when the drag characteristics of the same weft yarn vary widely depending on the state of the yarn's preservation and the arrangement of the weft measurement and storage device, proper flight of the weft yarn is possible while greatly shortening the time to normal weaving operation.

In FIG. 2 a first embodiment of a fluid jet loom according to the invention is shown by reference numeral L. The loom L of this embodiment is an air jet loom, where the weft yarn Y is inserted under the release of air pressurized through the nozzle to perform weft insertion or picking, which is inserted into the opening of the warp yarn (not shown). Y) a main or weft insert nozzle 1 configured to fire. Pressurized air is supplied from the pressurized air source 2 to the main nozzle 1 via the voltage-pressure proportional valve 3, the surge tank 4, and the electromagnet valve 5. The voltage-pressure proportional valve 3 is arranged to change the air discharge pressure of the main nozzle 1 (that is the pressure of the air supplied to the main nozzle) in proportion to the voltage supplied to the main nozzle. Therefore, the air discharge pressure of the main nozzle 1 can be controlled in accordance with the voltage supplied to the voltage-pressure proportional valve 3. The electromagnet valve 5 is arranged to control the air discharge start timing at which the air discharge of the main nozzle 1 starts and the air discharge end timing at which the air discharge of the main nozzle 1 ends.

The weft yarn Y is discharged from the weft feed package or bobbin 6 and introduced into the main nozzle through the weft measuring and storage device 7. The weft measuring and storage device 7 comprises a generally frusto-conical drum 9 mounted relatively rotatable at the tip end of the hollow rotating shaft 8 to remain stationary. The device 7 may be replaced by another type of device in which the weft yarn is applied on the surface to be floated or attached to during air separation. The hollow rotating shaft 8 is rotationally driven by a motor (not shown). The weft winding arm 10, one end of which is installed on the hollow shaft 8, extends radially relative to the drum 9 to form a top end section that bends forward to project over the outer circumferential surface of the drum 9. . The weft winding arm 10 is hollow and the hollow rotating shaft 8 so that the weft yarn Y from the weft supply package 6 is discharged through the hollow rotating shaft 8 from the top end section of the weft winding arm 10. Communicate on The weft yarn Y from the weft winding arm 10 is wound on the outer circumferential surface of the drum 9 as the weft winding arm 10 rotates with the rotation shaft 8.

The electromagnet actuator 11 is arranged close to the outer circumferential surface of the drum 9 to insert or eject the weft support pin 12 from a hole (not shown) formed in the outer circumferential surface of the drum 9. When the pin 12 is inserted into the hole, a predetermined length of the weft yarn Y is wound on the outer circumferential surface of the drum 9 so as to measure the weft yarn Y required for one parking. Weft yarn Y from 10) is bonded to or supported by the weft support pin 12. Then, the weft support pin 12 is ejected from the hole of the drum 9 at a predetermined pin ejection timing or the weft picking start timing at which weft insertion is started, whereby the weft yarn Y is removed from the main nozzle 1. The weft picking discharged from the outer circumferential surface of the drum 9 is carried out under the air discharge of.

The weft yarn (Y) fired from the main nozzle (1) is composed of a plurality of laterally arranged grooves (not shown) formed on the body blades (not shown) of the (not shown) body (not shown). Advance through the weft guide channel. The weft yarns Y thus flying are continuously discharged by six groups G1, G2, G3, G4, G5, and G6 of the auxiliary nozzles 16. At this time, the tip end of the auxiliary nozzle 16 each including five auxiliary nozzles 16 discharges the auxiliary air obliquely forward to counter the weft picking side opposite to the weft picking side where the main nozzle 1 is located. It is arranged along the weft guide channel to apply the flying weft yarn toward the woven fiber or fabric (not shown). Each group of auxiliary nozzles 16 is in fluid communication with a surge tank 18 via a voltage-pressure proportional valve 19. The voltage-pressure proportional valve 17 is similar in structure and function to the voltage-pressure proportional valve 3. Accordingly, the nozzle 16 receives pressurized air from the surge tank 18 through the voltage-pressure proportional valve 17 and the pressure of the auxiliary nozzle 16 (which is the pressure of the air supplied to the auxiliary nozzle 16). The air discharge pressure is controllable in accordance with the voltage to be supplied to the voltage-pressure proportional valve 17. Each electromagnet valve 19 is arranged to control the air discharge start timing at which air is discharged from the corresponding auxiliary nozzle 16 and the air discharge end timing at which the air discharge ends.

The loom L comprises a main controller or microcomputer 20 to which a signal output from the angle sensor 21 and a signal output from the weft loosening sensor 22 and a signal from the weft arrival sensor 23 are supplied. These signals act as control inputs to the main controller 20, respectively. The signal from the angle sensor 21 corresponds to the rotation angle of the main shaft (not shown) of the loom L (hereinafter referred to as "weaving spindle rotation angle"). The weft loosening sensor 22 is fixedly arranged in close proximity to the outer circumferential surface of the drum 9 and is unwound through the space between the loosening sensor 22 and the outer circumferential surface of the drum 9 during weft picking or insertion. It is comprised so that the passage of (Y) may be detected. The signal due to the passage of the unwinding yarn Y is obtained every time a thread of the weft yarn Y wound around the drum 9 is unwound, whereby the signal from the unwinding sensor 22 is picked once. Assuming that the length of n corresponds to n threads of wound weft yarn Y, n is obtained for the time period from the start of weft picking to the end. The weft arrival sensor 23 is arranged on the counter weft picking side and is positioned to detect that the picked weft yarn has reached the counter weft picking side.

The main controller 20 is configured and arranged to control the driver 25 by performing a predetermined calculation operation in accordance with a control input or an input signal. The driver 25 includes the air discharge pressure of the main nozzle 1 through the voltage-pressure proportional valve 3, the timing of the air release (start and end) of the main nozzle 1 with the electromagnet valve 5 closed, and the electromagnet It is arranged to control the operation (insertion and release) of the weft support pin 12 through the actuator 11. The driver 25 controls the air discharge pressure of the auxiliary nozzle 16 through the voltage-pressure proportional valve 17 and the timing of air discharge (start and end) of the auxiliary nozzle 16 through the electromagnet valve 19. .

Here, controlling the air release of the main nozzle 1 and the operation of the weft support pins 12 includes the rotation angle signal of the loom axis indicating the rotation angle of the loom spindle and the output generation from the angle sensor 21, the drum It is performed by observing the weft loosening signal indicating the loosening of the weft yarn Y from (9) and the generation of the output from the weft loosening sensor 22.

In particular, when the rotation angle of the loom main shaft reaches a degree corresponding to the air discharge timing of the main nozzle 1, the electromagnet valve 5 is turned on or opened to initiate the air discharge of the main nozzle 1. . Subsequently, when the pin release timing (weft picking start timing) is reached, the electromagnet valve 11 is turned on so that the weft support pin 12 is discharged from the hole of the drum 9 to thereby start the weft picking. During the weft picking, when the rotation angle of the loom main shaft reaches the air discharge start timing of each group of the auxiliary nozzles 16, the electromagnet valve 19 corresponding to each auxiliary nozzle group is turned on or opened to support the auxiliary nozzles of the corresponding auxiliary nozzle group. Air release from 16 is initiated. Thus, the air discharge is performed from a secondary nozzle group positioned corresponding to the tip end section of the flying weft yarn Y, with the forward movement of the weft yarn tip end section towards the counter weft picking side. Therefore, the air is discharged continuously from the upstream side auxiliary nozzle group toward the downstream side auxiliary nozzle group. When the rotation angle of the loom main shaft reaches the air discharge end timing of each group of the auxiliary nozzles 16, the electromagnet valve 19 is turned off or closed to terminate the air discharge of each group of the auxiliary nozzles 16. Therefore, the air discharge end is made continuously from the upstream side auxiliary nozzle group toward the downstream side auxiliary nozzle group.

When the air discharge end timing of the main nozzle 1 reaches the rotation angle of the loom main shaft, the electromagnet valve 5 is turned off or closed to terminate the air discharge from the main nozzle 1. When the weft loosening sensor 22 generates the nth round weft loosening signal (which becomes the fourth weft loosening signal when the length of the four threads of the weft yarn generally corresponds to one peaking), the electromagnet actuator 11 is turned off to weft The support pin 12 is inserted into the hole of the drum 9. Therefore, when the weft yarn Y of the skein of n times is picked, the weft yarn Y on the drum 9 is combined with the weft support plate 12 into which the weft yarn Y is inserted, thereby completing the weft picking.

In this embodiment, the data change of the weft yarn flight state is taken as the weft yarn (Y) is picked as the weft yarn (Y) is picked during the gateing operation to form the initial rough structure with the woven fiber. In gate operation, the loom spindle rotates at a low speed at which the weft yarn is inserted into the opening of the warp yarn. The gating operation is performed after the weaving operation in which the warp yarn of the loom is connected to a new warp yarn from the replaced warp beam. In this embodiment, the weft picking state in which the weft yarn is picked is set according to the data taken in the weft yarn flying state. This weft picking state setting control is performed by the main controller 20.

The main controller 20 includes a detector circuit 20a to which signals from the angle sensor 21, the weft loosening sensor 22, and the weft reaching sensor 23 are supplied. The detector circuit 20a is connected to the memory 20c for storing data from the detector 20a. The calculation circuit 20b is connected to the memory 20c to perform calculations based on the data from the memory 20c, and provides the memory 20c with calculated data necessary for the weft picking state setting control. The calculated data from the calculation circuit 20n is stored in the memory 20c to set the weft picking state. In addition, an input means 24 such as a keyboard is connected to the calculator 20b for inputting data changes necessary for weft picking state setting control. The memory 20c is connected to the weft picking state command circuit 20d which is connected to the driver 25 to transmit the command signal to the driver 25 according to the weft picking state set in the memory 20c.

In the weaving operation when the warp beam changes, a new filled warp beam is installed on the loom and the warp yarn of the new warp beam is distinguished from the warp yarn of the fabric reinforcement of the woven fabric woven before the weaving operation so that the new weave operation is Is initiated. In this weaving operation, no tension is applied to the divided warp yarns so that the upper and lower warp yarns are entangled with each other so that even if normal weaving operation is performed in this state, they are not separated from each other in the opening operation of the loom. As a result, it is impossible to fix the weft picking under this condition. In this respect, it is necessary to insert a weft yarn (Y) into the inclined opening under a low speed rotation of the loom spindle to roughly weave to perform a gating operation which requires several times to produce 1 to 2 m of woven fibers which are not suitable for the product. .

In order to set the weft picking state using this gating operation, in this embodiment, an apparatus for picking the weft yarn Y in the inclined opening while the loom spindle rotates at low speed (performing inching operation) was used. This device is referred to as a gating mode inching device.

Before describing the weft picking state setting control, the gating mode inching apparatus will be described first.

During inching operation the loom spindle rotates at a low speed of 30 rpm where the same operation is performed as in normal weaving operation. In this case, the rotational speed of the loom spindle is as low as about 1/20 of normal weaving operation, and therefore it is necessary to open the electromagnet valves 5 and 19 to coincide with the flight of the weft yarn Y. According to the above fact, in order to perform air discharge from the main nozzle 1 and the auxiliary nozzle 16 in the same manner as in the normal weaving operation, the main controller 20 is operated in the normal weaving operation (shown in FIG. 3A). It generates a false signal each having a time for opening the smaller electromagnet valves 5 and 19 (as shown in FIG. 3b). Therefore, in the inching operation, air discharge from the main nozzle 1 and the auxiliary nozzle 16 is made within a loom spindle rotation angle of about 1/20 under normal weaving operation.

In particular, during normal weaving operation, the loom spindle is operated such that the solenoid valves 5 and 16 are opened and closed at the timing shown in FIG. 3a, depending on the position of the tip end section of the weft yarn which has been flying or picked. It is rotated at high speed to perform air discharge from 16. However, even when the loom spindle rotates at low speed during inching operation, the weft yarns fly at the same speed as in normal weaving operation. Thus, when each of the electromagnet valves 5 and 19 is operated in response to a signal from the angle sensor 21, some groups of nozzles 16 will not be able to release air. In this regard, during inching operation the main controller 20 generates the false control signal shown in FIG. 4C from timing (trigger) or loom spindle axis rotation angle of 150 degrees. The false control signal is a pulse signal and is generated according to "time". In contrast, during the normal weaving operation, the normal control signal (pulse signal) as shown in FIG. 4B is generated according to the "loom spindle rotation angle". As shown in FIGS. 4B and 4C, each false control signal has a pulse width that is approximately equal to the pulse width of each normal control signal. In this regard, Fig. 4a shows a false signal which appears according to the rotation angle of the loom main shaft same as the normal control signal.

Therefore, the nominal discharge start and end timings of the main nozzle 1 and the auxiliary nozzle 16 are controlled in relation to the false signal during the inching operation and the normal control signal during the normal weaving operation. Therefore, the air discharge from the main nozzle 1 and the auxiliary nozzle 16 during the inching operation is performed for the same time as during the normal weaving operation as shown in FIGS. 3A and 3B. This allows the main nozzle 1 and the subsidiary nozzle 16 to match the position of the tip end section of the weft yarn (Y) that has been flying or picked even during inching operation without the need to improve or change each electromagnet valve (5, 19). To release. In FIG. 3A for normal weaving operation, the air release start timing (AEIT) and the air release end timing (AETT) of the main nozzle 1 and the subsidiary nozzle 16 and the weft support pin ejection of the weft support pin 12 are released. The timing PWT and the weft support pin insertion timing PIT are controlled according to the normal control signal as shown in FIG. 4B. The weft support pin 12 is ejected from the hole of the drum 9 at the pin release timing PWT and inserted into the hole at the pin insertion timing PIT. In FIG. 3B showing the inching operation, the air discharge start timing (AEIT) and the air discharge end timing (AETT) of the main nozzle 1 and the auxiliary nozzle 16, and the weft support pin of the weft support pin 12 are shown. The extraction timing PWT and the weft support pin insertion timing PIT are controlled according to the false control signal shown in FIG. 4C.

The above content is demonstrated in more detail below. During normal weaving operation, the angle sensor 21 generates pulse signals or normal control signals at equal intervals shown in FIG. 4B in the course of the rotation of the main shaft of the loom at a rotation angle of 0 to 360 degrees. At this time, the main controller 20 counts the number of pulse signals and output signals for opening and closing the electromagnet valves 5 and 19 in response to the counted pulse signals, according to the timing shown in FIG. 3A. Air release control of the nozzle 1 and the auxiliary nozzle 16 is performed. Similarly, the operation of the electromagnet actuator 11 is controlled in response to the number of pulse signals counted to perform release and insertion control of the weft support pin 12 at the timing shown in FIG. 3A. In the inching operation or the mode, the pulse signal from the pseudo sensor 21 is input to the main controller 20 in the same manner as in the normal weaving operation. However, a false signal is generated when the rotation angle of the loom main shaft reaches 150 degrees by detecting the rotation angle of the loom main axis from the pulse signal or the normal control signal. Subsequently, the main controller 20 outputs a false control signal and an output to open and close the electromagnet valves 5 and 19 in response to the number of counted false signals equal to the number of counted pulse control signals during normal weaving operation. The number of signals is counted, thereby performing air discharge control of the main nozzle 1 and the auxiliary nozzle 16 at the timing shown in FIG. 3b. Similarly, operation of the electromagnet valve 16 is controlled in response to a false control signal that is counted to perform release control of the weft support pin 12 at the timing shown in FIG. 3B. Thus, the six groups of auxiliary nozzles 16 perform air release consistent with the flight position of the tip end section of the picked weft yarn, thereby obtaining a stable flight of the picked weft yarn Y through the weft picking channel. Can be.

Then, the weft loosening sensor 22 detects the loosening of the weft yarn Y from the drum 9 and sends a signal to the main controller 20 indicating the loosening of the weft yarn. When the main controller 20 detects that the loosening of the weft yarn Y has been completed by a predetermined number, the weft support pin 12 is inserted into the hole of the drum 9 so that the loosening weft yarn Y and the weft support pin ( 12) sends a signal to the electromagnet actuator 11.

Then, the weft picking state setting control of the first embodiment is performed by using the gating mode latching device during the inching operation, which will be described with reference to the graphs of FIGS. 5 and 6 and a flowchart and FIGS. To explain.

In the flowcharts of Figs. 5 and 6, in step S1, the initial value of the loom spindle speed, the weaving fiber width L, the one-time picking looseness YN, the type of yarn, etc. It is input to the main controller 20 as input data through. The loom spindle speed is the rotational speed (rpm) of the loom spindle. Woven fiber width L is the width of the woven fiber. The number of picking loosenings YN is the number of skeins (of the weft yarn on the drum 9) that are released from the drum 9 during one picking. The kind of yarn is the kind of yarn to be used. In step S2, the lowest feed rate of the weft yarn Y is calculated according to the input data. The lowest feed rate is the lowest value at which the weft yarn Y is unwound from the drum 9 of the weft measuring and storage device 7. In step S3, the set state includes the initial value of the temporarily discharged air discharge pressure, the timing of starting and terminating the air discharge of the main nozzle 1, the initial value of the temporarily discharged air discharge pressure, and the auxiliary nozzle 16. Air discharge start and end timings.

Here, the initial value of the air discharge pressure of the auxiliary nozzle 16 is set larger than the average value of the air discharge pressure which has been normally used. In step S4, the inching operation is started. In step S5, the unwinding time (for 1 thread) of the weft yarn Y unwound from the drum 9 is measured (where 1 thread of weft yarn is the average value of the speed of unwinding in the drum 9). The weft feed rate is calculated from the measured value of the unwinding time (for one thread of weft yarn around the drum 9). The release time for one skew is the time from the output timing of one pulse signal from the weft loosening sensor 22 to the output timing of the next pulse signal from the weft loosening sensor 22. In particular, the pulse signal is the output from the weft loosening sensor 22 in each passage of the weft yarn Y through the space between the loosening sensor 22 and the drum 9. The length L / YN of the weft yarn corresponding to one thread around the drum 9 can be obtained from the width L of the woven fiber and the unwinding number YN at the time of one picking. The feed rate of the weft yarn is calculated by dividing the length (L / YN) of the weft yarn by the loosening time (one thread).

In step S6, it is determined whether the weft feed rate obtained in step S5 is linear, that is, whether there is a speed drop in the weft yarn feed characteristics. There is no problem when the characteristic of the weft feed rate becomes linear as shown by the solid line in FIG. However, there is a problem when there is a drop in the weft feed rate, as shown by the dashed line in FIG. In FIG. 9, CY1, CY2, CY3, CY4 represent the release points of the first, second, third and fourth tufts of the weft yarn on the drum 9, and Lcy3 represents the weft yarn wound from the time point CY1 to CY3. The distance (length, L) of (Y) is shown. If the weft feed rate is linear, the flow advances to step S7. If it is not linear, the flow advances to step S8.

In step S8, the timing of the end of the air discharge of the main nozzle 1 is delayed, thereby proceeding to step S5 and the release time of the weft yarn Y (one round) after the timing of the main nozzle air release end is delayed. Measure In step S7, the air discharge pressure of the main nozzle 1 is changed, thereby proceeding to step S9, where values for the first, second, third and fourth threads of the weft yarn on the drum 9 are obtained. And release times (Tcy1, Tcy2, Tcy3, Tcy4) corresponding to the changed main nozzle known release pressures. In step S10, it is determined whether or not the air discharge pressure of the main nozzle 1 has changed a predetermined number (n times). If the change of the predetermined number of times is not completed, the process returns to step S4 to perform steps S4 to S9 again. In the process from step S10 to step S11, the weft feed characteristic (or main nozzle characteristic) is obtained as shown in FIG. The weft feed characteristic is the relationship (equation) between the weft feed rate (V) and the air discharge pressure (pm) of the main nozzle (1). In Fig. 13, V0 (V0), V1 (V1) and V3 (V3) respectively indicate the weft feed rates that vary with the air discharge pressures Pm0, Pm1, Pm3 of the main nozzle 1.

In step S11, to obtain the lowest main nozzle air discharge pressure (Pmin in FIG. 13) which is the lowest value of the main nozzle air discharge pressure that the weft yarn Y can reach the counter weft picking side under the weft supply characteristic of FIG. The calculation is performed. The lowest main nozzle air discharge pressure Pmin corresponds to the lowest value Vmin of the weft feed rate, as shown in FIG. Setting the lowest main nozzle air discharge pressure to the lowest limit value is preferable because it can prevent the main nozzle air discharge pressure from being set at a value lower than the lowest limit value.

In step S12, the air discharge start and end timings of the main nozzle 1 and each of the auxiliary nozzle groups 16 are set according to the lowest main nozzle air discharge pressure set in step S11. The method of setting the air discharge start and end timing of the main nozzle 1 and each auxiliary nozzle 16 group is demonstrated below.

Normal weaving operation of the loom in step S13 is started (for one packing) and the arrival time and the unwinding time are measured in step S14. The arrival time is the time from the release timing of the weft support pin 12 (from the hole of the drum 9) to the signal output timing from the weft arrival sensor 23. The release time is the time from the extraction timing of the weft support pin 12 to the signal output timing from the weft loosening sensor 22 (indicative of the release time of the fourth tuft of weft yarn Y on the drum 9). Here, a calculation is performed to obtain the time or speed difference Xt between the arrival time and the release time. The process then proceeds to step S15 where the measured arrival time is compared with the target arrival time. If the measured arrival time is longer than the target arrival time, that is, if the measured speed of the picked weft yarn Y is lower than the target speed of the yarn, the flow proceeds to step S16 where the air discharge pressure of the main nozzle 1 Is raised. Then, the process proceeds to step S17 where it changes in accordance with the changed main nozzle air discharge pressure of the air discharge start and end timing of the main nozzle 1. Then, the process proceeds to step S14, where the arrival time is measured and a comparison between the thus measured arrival time and the target arrival time is performed. In other words, the air discharge pressure of the main nozzle is raised until the measured arrival time becomes shorter than the target arrival time. When the measured arrival time becomes equal to or shorter than the target arrival time, the flow proceeds to step S18.

Here, the main nozzle air discharge pressure finally changed in step S16 becomes the current main nozzle air discharge pressure. In step S19, the arrival time and release time of the weft yarn Y are measured to calculate the time or speed difference X between the arrival time and the release time. This speed difference represents the amount of meandering or fish-tailed movement of the picked weft yarn (Y). The appropriate amount of grain is empirically determined to obtain proper flight of weft yarn (Y) and high quality woven fibers, and depends on the type of weft yarn. This case is explained by the assumption that the picked weft yarn (Y) has the smallest possible amount of grain and that it is best suited for the smallest time difference possible for the straight flight of the weft yarn.

In step S20, the calculated speed difference X is compared with a value A.Xt multiplied by a constant A and the speed difference Xt (in step S14). The constant (A) acts to set the allowable range of the amount of grain, wherein the air discharge pressure of the subsidiary nozzle 16 is between the speed difference X of the subsidiary nozzle 16 and the air discharge pressure P within the above range. When the relationship is lowered as shown in FIG. 10 showing the relationship of the woven fiber quality can be maintained. If it is determined in step S20 that X≥A.Xt, the grain amount of the picked weft yarn Y becomes large and therefore proceeds to step S22, where the air discharge pressure of the auxiliary nozzle 16 is raised. X If it is determined that the relationship is A. Xt, the process proceeds to step S21, where the measured arrival time of the picked weft yarn Y is compared with the target arrival time. If the measured arrival time is less than or equal to the target arrival time (ie, the measured arrival time) If the target arrival time), the flow returns to step S18 to lower the air discharge pressure of the auxiliary nozzle 16. If the measured arrival time is longer than the target arrival time (the pressure of the auxiliary nozzle is raised), the flow advances to step S22 to raise the air discharge pressure of the auxiliary nozzle 16. Here, the air discharge pressure of the finally changed auxiliary nozzle 16 is used as the air discharge pressure of the finally determined auxiliary nozzle 16.

In step S23, control is performed to advance the air discharge end timing of the main nozzle 1, and then proceeds to step S24, where it is shorter than or equal to the measured arrival time target arrival time ( That is, if the measured speed of the picked weft yarn is higher than the target speed of the weft yarn, the flow returns to step S23 to advance the air discharge end timing of the auxiliary nozzle 1 to save pressurized air consumption. .

If the measured arrival time is longer than the target arrival time, the flow proceeds to step S25, where the air release end timing takes precisely the value obtained before the measured arrival time becomes longer than the target arrival time. By setting the value of this main nozzle air discharge end timing, the main nozzle air discharge timing is finally determined. In step S26, the air discharge start timing of the auxiliary nozzle 16 is set according to the release time, and the flow proceeds to step S27 in which the air discharge end timing is advanced. In step S28, the measured arrival time is compared with the target arrival time. If the measured arrival time is not longer than the target arrival time (ie, the measured speed of the picked weft yarn is equal to or higher than the target speed of this weft yarn), the flow returns to step S27 and the Further advances the air discharge end timing. If the measured arrival time becomes longer than the target arrival time, the flow proceeds to step S29 where the air release end timing takes precisely the value obtained before the measured arrival time becomes longer than the target arrival time. By setting the value of the air discharge end timing of this auxiliary nozzle, the auxiliary nozzle air release timing is finally determined.

As can be seen from the description of the embodiment, in the process from step S1 to step S12, the weft yarn Y is inserted into the opening of the warp yarn by the low speed rotation of the loom spindle, and the low speed rotation of the loom spindle The release time of the picked weft yarn at the time is measured as the flight state data of the picked weft yarn as the air discharge pressure of the main nozzle 1 is varied in the picked state. According to this data, a setting is made for the air discharge pressure of the main nozzles and the timing of the start and end of the air discharge of the main nozzle 1 and the auxiliary nozzles. Then, since the normal weaving operation is performed in step S13, the air discharge pressure of the main nozzle 1 and the subsidiary nozzle 16 and the air discharge timing of the main nozzle 1 and the subsidiary nozzle 16 are set here. As they vary, a lot of data about the weft yarn's flight status is measured.

In particular, the loosening time of the picked weft yarn (Y) inserts an inclined opening which enables shedding operation at low speed during the gating operation of the loom, so that the weft feed is the relationship between the air discharge pressure of the main nozzle 1 and the weft feed rate. Taking the (sensitivity) characteristic, it is measured to calculate the lowest main nozzle air release pressure. As a result, weft picking can be stably performed even under rotation at the normal operating speed of the loom spindle. From this state, the weft picking state is gradually changed to be set by calculating the optimum weft picking state. This greatly reduces the time from the start of loom operation to normal operation.

Although the normal weaving operation is shown and described as starting from step S13 of the above embodiment, the loom operation at the low speed rotation of the same loom spindle as in the gating operation is performed when the air discharge end timing of the auxiliary nozzle 16 is finally set. It can be understood that from step S13 to step S29 can be continued, after which normal weaving operation can be performed. In this case, it is necessary to convert the time measured at the low speed rotation of the loom spindle to the rotation angle of the loom spindle. This conversion may be performed by the conversion method described with reference to FIGS. 3A and 3B.

The method of setting the air discharge start and end timing of the main nozzle 1 and each auxiliary nozzle 16 group is demonstrated. This setting is performed in step S12 of the flowchart of FIG.

The purpose of setting the air discharge start and end timings of the main nozzle 1 and each of the auxiliary nozzles 16 groups is to control the discharge of air from the main nozzle 1 and the group of the electromagnet valves 19 and each of the auxiliary nozzles 16. To automatically adjust the opening and closing timing of the electromagnet valve 19 and to maintain the weft arrival time at a predetermined value to control the release of air from the air. That is, the object is to automatically set the air discharge start and end timings of the main nozzle 1 and the auxiliary nozzle 16 to obtain a predetermined arrival time of the picked weft yarn while consuming the minimum energy of the air.

That is, in the flow step proceeding to step S11, the weft yarn supply characteristic (main nozzle characteristic) shown in FIG. 13 is determined. The weft supply characteristic of FIG. 13 is a relationship between the air discharge pressure Pm of the main nozzle 1, and the weft supply speed V. FIG.

This relationship is represented by the equation

V = F = f (Pm)

Therefore, the weft feed rate V can be determined by substituting Pm in the above equation.

Referring to FIG. 7 showing a method of flying the picked weft yarn (Y), the weft feed rate (V) is a straight line defined by time and the supply or flight distance (Ln, L1 to L5) of the picked weft yarn. Appears as a slope. In FIG. 7, SV1 to SV6 represent discharge times of each of the auxiliary nozzle groups G1 to G6. The said discharge time is time from the air discharge start timing of each auxiliary nozzle group to the air discharge end timing. The points t1 to t6 and tn show the opening timings of the electromagnet valves 19 corresponding to the auxiliary nozzle groups G1 to G6, respectively. The points t1 'to t6' and tn 'show closing timings of the electromagnet valves 19 corresponding to the auxiliary nozzle groups G1 to G6, respectively. L1 to L5 (Ln) show positions of the foremost (upstream) auxiliary nozzles 16 in the auxiliary nozzle groups G1 to G6, respectively.

The air discharge start and end timing of each auxiliary nozzle group is set as follows. The opening timings tn, t1 to t6 of each of the electromagnet valves 19 corresponding to the auxiliary nozzle groups G1 to G6 are obtained by the following calculation formula.

tn = (Ln / V-α) + pin ejection timing (N = 1… K)

Here, α is advanced air release before the weft support pin 12 is ejected from the hole of the drum 9 and in advance the air release timing set in anticipation of the change in the opening timing tn shown in FIG. Timing. The advanced air release timing is obtained from the measured mean value of the actual amount of change produced or continuously updated according to the control experience. "Pin ejection timing" is a timing at which the weft support pin 12 is ejected from the hole of the drum 9.

Subsequently, the respective closing timings tn ', t1' to t6 'corresponding to the electromagnet valves 19 of the auxiliary nozzle groups G1 to G6 can be obtained by the following calculation formula.

tn '= tm' + emission time initial value (n = 1… K)

Here, the initial release time is the initial value of the air release time shown in FIG.

Therefore, the opening timing tn and the closing timing tn 'of the electromagnet valve 19 corresponding to each auxiliary nozzle group are set and change in accordance with the set air discharge pressure Pm of the main nozzle 1. That is, the timing of starting and ending the air discharge of the auxiliary nozzle 16 is set at an appropriate value in accordance with the air discharge pressure Pm of the main nozzle 1.

Next, the air discharge start and end timing of the main nozzle 1 are set as follows. Referring to FIG. 8 showing a method of flying the picked weft yarn Y, the weft feed rate v is represented by a straight slope determined by the time and the supply or flight distance of the picked weft yarn Y. FIG. In FIG. 8, MV represents the discharge time of the main nozzle 1. The discharge time is the time from the air discharge start timing of the main nozzle 1 to the air discharge end timing. The point T shows the opening timing of the electromagnet valve 5 corresponding to the main nozzle 1. Point T 'shows the closing timing of the electromagnet valve 5.

The opening timing T of the electromagnet valve 5 for the main nozzle 1 can be obtained by the following equation.

T = Pin Ejection Timing-β

Where β denotes the air release time before the weft support pin 12 is ejected from the hole of the drum 9 and in advance of the air release time set in advance by predicting the change in the opening timing T shown in FIG. to be.

Subsequently, the closing timing of the electromagnet valve 5 for the main nozzle 1 can be obtained by the following equation.

T '= (emission operating point / V) + γ + pin ejection timing

The "emission operating point" here is for setting a supply distance at this point in which the velocity drop of the picked weft yarn does not occur when air discharge continues. The supply process L is determined by experience, for example, the distance Lcy3 in FIG. The symbol γ is an air discharge time after the weft yarn Y reaches the discharge operating point, and is a delayed air discharge time set in advance by predicting a change in the opening timing tn shown in FIG. The delayed air release time is obtained from the measured mean of the actual amount of change produced or continuously updated by the control experience.

Therefore, the opening timing T and the closing timing T 'of the electromagnet valve 5 for the main nozzle 1 are varied according to the set air discharge pressure Pm of the main nozzle. That is, the air discharge start timing and the end timing of the main nozzle 1 are set to appropriate values in accordance with the air discharge pressure Pm of the main nozzle 1.

By setting the air discharge start timing and the end timing of the main nozzle 1 and the auxiliary nozzle 16 to appropriate values according to the air discharge pressure pm of the main nozzle 1, the following important effects are obtained. The flight speed of the picked weft yarn Y varies with the magnitude of the air discharge pressure Pm set value of the main nozzle 1. Therefore, the air discharge start timing and the end timing of the main nozzle 1 and the subsidiary nozzle 16 are set in relation to the weft feed rate V so that air is not needed from the main nozzle 1 and the subsidiary nozzle 16 accordingly. By eliminating the delay time, the proper air release timing of the main nozzle and the auxiliary nozzle corresponding to the tip of the picked weft yarn Y is obtained.

The weft picking condition setting control, which is the second embodiment of the present invention, will be described below with reference to the flowchart of FIG. 11 and the graphs of FIGS. 12 and 13. This second embodiment is the same apparatus as the first embodiment of FIG.

Referring to the flowchart of FIG. 11, in step S31, the initial value of the main shaft rotational speed N of the target loom, the width L of the woven fiber, and the like are input to the main controller 20. In step S32, the calculation is executed in the main controller 20 (where the weft yarns fly) to obtain the allowable flight time To and the minimum supply or flight speed Vmin. The allowable flight time To is calculated from the spindle speed N of the target loom and the width L of the woven fiber. The minimum flight speed Vmin is the speed of the picked weft yarn Y passing through the sloped opening and is the slope determined by the time and the supply distance L as shown in FIG. Therefore, the minimum flight speed Vmin is set to an average value. In step S33, predetermined initial values of the air discharge pressure Pm of the main nozzle and the air discharge pressure Pso of the auxiliary nozzle are set. The initial value is determined empirically.

In step S34, the main controller 20 sets the operation timing of the main nozzle 1 and the subsidiary nozzle 16 for the inching operation, in which the weft during the inching operation at the main shaft rotational speed of the low speed loom Picking is performed within the same time as during normal weaving operations at the spindle speed of the loom of normal speed. For example, when the main shaft rotational speed of the loom reaches 150 degrees (measured by a trigger), the operation timing such as the ejection and insertion of the weft support pin 12, the main nozzle 1 and the group of the respective auxiliary nozzles 16 The calculations and settings for the air discharge start timing and end timing are performed. The operation timing of the main nozzle 1 and the subsidiary nozzle 16 is converted into the main shaft rotational speed value of the loom. The inching operation is started after the weft picking state is thus set.

In step S35, a determination is made whether the loom operation is in the gating mode (where the gating operation is executed).

In the gating mode, the main shaft of the loom rotates at a low speed so that an inching operation is performed in which weft picking conditions such as air discharge pressures Pm1, Pm2, ... of the main nozzle are smoothly changed as shown in FIG. Proceed. At this time, the release times Tcyl, Tcy2, ... for each of the predetermined rotational speeds of the weft yarn Y on the drum 9 are measured whenever the air discharge pressure of the main nozzle changes. This measurement is made on the basis of the actual time and therefore the measurement is not made on the basis of the main rotation angle of the loom detected by the angle sensor 21. The arrival time can be measured at this stage, which is the duration (for one revolution of the weft yarn on the drum) from the firing timing of the weft support pin 12 to the timing at which a signal is output from the weft arrival sensor. . The weft feed rate is recognized similarly to the recognition associated with step S5 of FIG. 5 from the measured release time.

In step S37, a determination as to whether the weft feed rate is linear (or a speed drop) is made similarly to the determination of step S5 of FIG. If the weft feed rate is linear, the flow proceeds to step S38. When the weft feed rate is lowered, the flow proceeds to step S39. In step S39, the timing of air discharge of the main nozzle is delayed, and the flow returns to step S34 again. In step S38, the release times Tcyl, Tcy2, ... of the picked weft yarn Y are stored. The time of arrival of the picked weft yarn Y is also stored.

In step S40, a determination is made as to whether the measurement of the release time (for a given number of pickings) has been completed. If the measurement is completed, the flow proceeds to step S41. If the measurement is not completed, the measurement continues and each measurement data is stored when returning to step S38. The execution of the measurement for the predetermined number of pickings is to obtain an average value of the unwinding times of the picked weft yarns Y.

In step S41, the weft feed rates V1, V2, ... are calculated from the stored release times Tcy1, Tcy2, .... According to the weft feed rates (V1, V2, ...) thus calculated, the relationship between the air discharge pressure (Pm) of the main nozzle and the weft feed rate (V) (i.e., the weft feed characteristics) is a straight line as shown in FIG. Appears.

In step S42, a determination is made as to whether the air discharge pressure of the main nozzle 1 has been changed and the measurement of the air discharge pressure in at least two main nozzles has been completed.

When the measurement is completed, the process proceeds to step S43 in which weft supply characteristics as shown in FIG. 13 are calculated. In step S44, the air discharge pressure of the main nozzle is calculated and set.

When the measurement of the air discharge pressure at the at least two main nozzles described above is not completed, the flow proceeds to step S45. In this step S45, a comparison is made between the constant speed Δv and the difference of the minimum supply speed V with respect to the obtained phase supply speeds V, V1, V2,... The constant velocity Δv is, for example, 20% of the lowest feed rate Vmin.

When the difference V-Vmin is sufficiently larger than the constant velocity Δv, that is, (V-Vmin) Δv, the air discharge pressure of the main nozzle is lowered (S46). If the difference is not greater than the constant or V-Vmin < = DELTA v, the flow proceeds to step 47 which is elevated to the main nozzle air discharge pressure. In steps S46 and S47, the flow advances to step S36 to repeat the measurement of steps S36 to 45.

As described above, the main nozzle air pressure in the weft picking state is automatically set in the inching process before the normal weaving operation of the loom. In the flowchart of FIG. 11, the weaving process following the END is the same as following step S13 of the flowchart of the first example of FIGS. 5 and 6, and is omitted for the sake of brevity.

While the air discharge pressure of the main nozzle 1 is described and illustrated as being decreased in step S46 and increased in step S47, the air discharge time width (between the air discharge start and end timings) of the main nozzle is It will be appreciated that this is changed by varying the main nozzle air release pressure. In this case, the main nozzle air discharge pressure is kept constant, and the air discharge start and end timings of the main nozzle 1 and the subsidiary nozzle 16 are changed so as to attain the arrival time and the unwinding time (during one picking). The actual change is measured. In this regard, the main nozzle air discharge timing is measured to obtain target values of the arrival time and the unwinding time of the picked weft yarn Y instead of the calculation of the main nozzle air discharge pressure in step S14.

FIG. 14 shows the weft picking state setting control unit of the third embodiment of the present invention as the same device as the first embodiment of FIG. 2, and an appropriate value of the air discharge pressure of each group of the auxiliary nozzles 16 is shown in FIG. It can be set according to the difference between the arrival and release timing upon the change of the air release pressure of each group of 16).

In the flowchart of FIG. 14, the flow from step S31 to step S40 is the second embodiment except omitting step S36 '(measuring release and arrival time) and steps S37 and S39. Is generally the same as The loosening time and the arrival time (during one picking) of the picked weft yarn Y are measured in step S36 '.

In step S59, it is determined whether the measurements for loosening and arrival times have been completed (eg three) n pressure conditions or not. If the flow proceeds to step S60, the change in time difference between release and arrival time is calculated to obtain the relationship between the difference and the difference in the auxiliary nozzle air discharge pressure shown in FIG. In step S61, the value Ps of the auxiliary nozzle air discharge pressure is set in the manner shown in FIG. The auxiliary nozzle air discharge pressure Ps coincides with the point Δt of the time difference, and the point of the time difference suddenly rises from this point Δt.

If the measurement of arrival time and release time has not yet been carried out at the pressure of n condition, the flow proceeds to step S62, where the air discharge pressure of the auxiliary nozzle 16 is changed to reduce the air pressure consumption. Next, the flow proceeds to step S36 ', where the flow from step S56 to step S58 is repeated. This iteration is performed to obtain an average value of the arrival and release timings and reduces the effects of error.

As described above, in the weft picking state, the auxiliary nozzle air discharge pressure is automatically set during the pulling process after the normal weaving process of the loom.

While the auxiliary nozzle air discharge input is shown and described as calculated and set in the third embodiment, the air discharge time width (between the air discharge start and end timings) of the auxiliary nozzle is used to calculate and set the auxiliary nozzle air discharge pressure. Instead it can be calculated and set similarly. In this case, the subsidiary nozzle air discharge pressure is replaced by the subsidiary nozzle air discharge width of step S62.

Although the appropriate subsidiary nozzle air pressure is shown and described as being set according to the time difference between arrival and release time at the subsidiary nozzle air release pressure change, it will be appreciated that the appropriate subsidiary nozzle air release pressure is only set according to the release time. will be. In this case, the weft feed characteristic of the main nozzle 1 is calculated and set at the time of measurement of the loosening time, the arrival time is calculated according to the set weft feed characteristic, and the operating state of the auxiliary nozzle 16 is the woven fiber. In (L), etc., the loom is automatically calculated as the loom spindle speed.

While the embodiment described above is shown and described as weft yarn flight conditions are measured by using the weft picking process during the inching process (as an indent for weft picking control) when the weft picking state changes, The index for the weft yarn is measured in such a way that the tension of the weft yarn is measured during flight of the weft yarn and is obtained to obtain tension under conditions for matching the target arrival time, and is obtained by obtaining the tension provided as an index. In this case, as shown in FIG. 16, the weft tension sensor 26 is provided to measure the tension of the weft yarn Y between the drum 9 and the main nozzle 1. A signal (indicating the weft yarn tension) from the weft tension sensor 26 is input to the detection circuit 20 of the main controller 20. In addition, the tension limit value input means 27 is provided to input the tension limit value to the calculation circuit 20b. The tension limit is higher than the weft yarn breaking.

It can be seen that the above embodiment can be applied to a multi-color loom, the weft picking state measures each color form at the measurement of weft picking or feeding characteristics in the inching process that sets the weft picking state, and also weft each color form It is measured by remembering the color shape by calculating the weft picking condition.

Although the embodiment has been shown and described as being set for the minimum air discharge pressure of the nozzle, the main nozzle air discharge pressure and time, and the auxiliary nozzle air discharge pressure and time, respectively, the setting is obtained by combining a plurality of the above conditions. It's about one of the things.

As can be seen above in accordance with an embodiment of the present invention, a suitable weft picking state can be set by varying the type of weft yarn, fabric width, etc. in conjunction with changing warp beams. In addition, these suitable weft picking conditions are set automatically, and it is unnecessary to create a complex weft picking state setting process in which weft picking and loom stopping are repeated with the experience and perception of the loom operator, thus greatly increasing the loom operating time and the number of operating steps. Can be reduced. Additionally, even when the traction characteristics for the weft yarns vary depending on the yarn's preservation status and the arrangement of the yarn measuring and storage device 7, the weft yarn will stably reach the opposite inclined picking side to reach the normal weaving operation of the loom. This can greatly reduce the time required.

In particular, according to embodiments of the present invention, the data for controlling the weft picking state is picked into the inclined opening when the loom main shaft is rotated at low speed while changing the inclined beam while providing a suitable tension force for the inclination (commercially available). It can be obtained by using a gating operation that will form a woven fabric (not suitable for the product).

Thus, since the data obtained are made during the gating operation performed essentially changing the warp beam, the time to reach a normal weaving operation is effectively reduced. Additionally, since the fabric woven during the gating operation is inherently unsuitable for a commercial product, useless woven fabrics other than those formed during the gating operation are not formed, thereby reducing the formation of useless fabrics. Now, a fourth embodiment of the fiuid jet loom of the present invention is described with reference to FIG.

This embodiment is identical to the arrangement of the first embodiment of FIG. 2, except that the control scheme of the main controller 20 is described below. That is, the control method is as follows. First, the air discharge pressure of the main nozzle 1 is set to an initial value under the operation of the weft picking state command circuit 20d. Then, the release time of the picked weft Y is detected under the action of the detector circuit 20a during the weft picking. The calculation circuit 20b calculates the weft supply (drawing) characteristics of the weft yarn Y drawn from the weft measurement and storage device 7 according to the detected release time and the initial set value of the main nozzle air discharge pressure. The set value of the main nozzle air discharge pressure of the weft picking state command circuit 20d is determined in accordance with the following with respect to the weft supply characteristic shown in FIG.

P (t) = Kp (Vref-V (t)) + C

In the above formula, P (t) is the working amount of the air discharge pressure of the main nozzle 1; Kp is the proportional constant or gain obtained from experience, Vref is the target value of the weft unwinding time or weft feed (draw) speed, V (t) is the current value of the unwind time or weft feed rate, and C is the workload (PCt) The correction amount for obtaining a stable value of. The above equation is obtained from the PID algorithm under the feedback control of the microcomputer of the main controller 20.

Proportional gain Kp is calculated according to the measurement result of the weft feed (draw) characteristic of FIG. That is, 1 / Kp = ΔVcy / ΔP, where ΔVcy is the amount of change in the main nozzle air discharge pressure. ΔP is the amount of change in the weft feed (draw) speed v. Figure 17 shows the weft feed (draw) characteristics of two different kinds of weft yarns (wefts A and B).

When the above expression is reversed, the above equation becomes Kp = ΔP / ΔVcy. In accordance with this equation, the calculation circuit 20b calculates the proportional addition Kp and outputs it to the weft picking state command circuit 20d, thereby converting the proportional gain Kp already set in the command circuit 20d. Will be corrected. Therefore, the air discharge pressure of the main nozzle 1 is automatically set according to the weft supply (drawing) characteristic, preventing the long time required for convergence of the main nozzle air discharge pressure to the target value and controlling the nozzle air discharge pressure. Value prevents hunting. As a result, even if any disturbance occurs and the controlled value moves from the target value, the controlled value is smoothly corrected to achieve a control with high accuracy. As a result, the optimum weft picking state is automatically set to significantly reduce the work time and the number of work steps. In addition, even when the weft feed (draw) characteristics vary depending on the state of yarn preservation and the arrangement of the yarn measurement and storage device 7, the weft yarn can safely reach the weft picking side to start the normal weaving operation. Significantly reduces the time to reach.

18 shows a fifth embodiment with the fourth embodiment except that the yarn type selecting means 30 is added.

In this embodiment, the memory 20c already stores the data shown in Fig. 19, in which the yarn types (A, B, C; types of weft picked) are discussed in the fourth embodiment. It is related to the proportional gains Kp1, Kp2, Kp3 calculated by the calculating circuit 20b.

When the type of yarn is input to the memory 20c through the yarn type selecting means 30, the proportional gain Kp corresponding to the yarn type is selected and fed to the weft peaking state command circuit 20d through the arithmetic circuit 20b. Is output. For example, when the weft type C is input under the operation of the weft type selection means 30, since the proportional gain Kp3 is input to the weft picking state command circuit 20d, the air discharge pressure of the main nozzle 1 Is automatically controlled to a value suitable for weft type C immediately. Therefore, according to the fluid jet loom of the fifth embodiment, the proportional gain Kp calculated from FIG. 17 is stored as another proportional gain corresponding to the type of yarn as in the data of FIG. As a result, the air discharge pressure of the main nozzle 1 is automatically controlled to a value suitable for the kind of yarn.

Regarding the proportional gain Kp in the fourth and fifth embodiments, the proportional gain Kp is obtained from the weft loosening sensor 22 (n for the nth rotation of the weft wound on the drum 9). It is calculated from the standard value Tcyn of the release time obtained at the time of generation of the first release signal.

The release sensor 22 is adapted to generate one release signal at the release timing of each rotation of the weft wound on the drum 9.

In particular, 1 / Kp is first calculated from FIG. 20, which is a measurement result of the unwinding time with respect to the main nozzle air discharge pressure, according to the following equation 1 / Kp = ΔTcyn / ΔP, where ΔTcyn is the unwinding time shown in FIG. The amount of change in ΔTcyn.

Inverting the above equation results in Kp = ΔP / ΔTcyn. Therefore, the calculated proportional gain Kp is replaced by the following equation P (t) = Kp (Tcynref-Tcyn (t)) + C, where Tcynref is the target of the release time at the occurrence time of the n-th weft loosening signal. Value, and Tcyn (t) is an average value of the release times at the timing of the occurrence of the n-th weft loosening signal, and the average value is obtained by averaging the release times in several pickings, respectively.

FIG. 21 shows a sixth embodiment of a fluid jet loom according to the present invention with five auxiliary nozzle groups G1, G2, G3, G4, G5 and the main controller 20 with a weft picking on the reverse weft picking side. 1 to 2, except that the setting circuit 20b for setting the ejection time of the auxiliary nozzles is set to the side, that is, the order of the auxiliary nozzle group G1 from the auxiliary nozzle group G5. Similar to

The manner of operation of this embodiment is described with reference to the flowchart of FIG. In the flowchart, the flow from step S1 to step S26 is the same as that of the first embodiment (of FIGS. 5 and 6), and thus description thereof is omitted.

In step S77, the air discharge timing of the auxiliary nozzle 16 in the most downstream auxiliary nozzle group G5 (near the reverse weft picking axis) is advanced by the minute time At5. The arrival time and the arrival time measured in step S78 are compared. If the measured value is not longer than the target value, i.e. if the measured value is equal to or shorter than the target value (or yes in step S78), the flow is reduced in the front auxiliary nozzle group G4 to save unnecessary air pressure consumption. The air discharge timing of the auxiliary nozzle 16 is advanced to step S79 where the air is advanced by the minute time At4.

If it is determined in step S78 that the measured value is longer than the target value (or if S78 is No), this can shorten the air discharge period of the auxiliary nozzle 16 in the auxiliary nozzle group G5. None, and flow proceeds to step S80. In step S80, the air discharge end timing of the auxiliary nozzles 16 of the group G5 is changed or returned to the state before advancing in step S77. Under the returned air discharge end timing setting, the air discharge end timing of the auxiliary nozzle 16 is finally determined.

In step S81, the measured arrival time as the advancement result by the time DELTA T4 of the air blowing end timing of the front auxiliary nozzle group G4 is compared with the target value. When the measured value is equal to or shorter than the target value (or when step S81 is YES), the flow is such that the air blowing timing of the auxiliary nozzles 16 of the front auxiliary nozzle group G3 is the minute time ΔT3. Advance by) to proceed to step (S83) to save unnecessary air pressure consumption.

If the measured value is longer than the target value (or if step S81 is No), this means that it is impossible to reduce the air discharge time of the auxiliary nozzle 16 of the auxiliary nozzle group G4, and therefore the flow is auxiliary. The nozzle group G4 returns to the state before the air discharge end timing is changed or advanced, and the air discharge end timing of all the auxiliary nozzles is finally determined.

In step S84, according to the measurement of the progress result by the minute time Δt3 of the air discharge end timing of the front group G3 auxiliary nozzle, a comparison is made between the measured arrival time and the target arrival time. If the measured value is not longer than the target value, i.e. if the measured value is the same or shorter than the target value (or if step S84 is yes), then the flow is subsidized by the front auxiliary nozzle group G2 to save unnecessary air pressure consumption. The air discharge end timing of the nozzle 16 is advanced to step S86 by a small time Δt2. If the measured arrival time of the group G3 auxiliary nozzle 16 is longer than the target value (or step S84 is No), this means that the air discharge time of the auxiliary nozzle 16 of the auxiliary nozzle group G3 is The flow proceeds to step S85 in which the air discharge end timing of the auxiliary nozzles 16 of the auxiliary nozzle group G3 is changed or returned to the state before it is advanced.

Under the returned auxiliary nozzle air release end timing setting, the air discharge end timings of all the small nozzles are finally determined.

In step S87, the result of the advance by the minute time [Delta] t2 of the air discharge end timing of the front group G2 auxiliary nozzle 16 is measured, and a comparison is made between the measured arrival time and the target value. If the measured value is not longer than the target value, that is, if the arrival time is the same as the target value (or step S37 is Yes), the flow is the secondary of the most upstream (near the weft picking side) auxiliary nozzle group G1 The timing for discharging the air discharge of the nozzle 16 is advanced by the minute time? T1 to proceed to step S89 in which unnecessary air pressure consumption is saved, if it is determined that the measured value is not longer than the target value in step S87 ( Or if step S87 is No), this means that the air discharge time of the group G2 secondary nozzle 16 cannot be shortened, so that the flow is caused by the air of the group G2 secondary nozzle 16. The discharge end timing is changed or returned to the state before it was advanced to step S88. Under the returned auxiliary nozzle air discharge end timing setting, the air discharge end timings of all the auxiliary nozzles are finally determined.

In step S90, the advancement result by the minute time Δt1 of the air discharge end timing of the most upstream group G1 is measured, and a comparison between the measured arrival time and the target value is made. If the measured value is not longer than the target value, that is, the measured value is the same or shorter than the target value (or if step S90 is Yes), it cannot shorten the air discharge time of all the auxiliary nozzles 16. Therefore, the flow returns to step S77 for performing the next control. Continuously and repeatedly performed from the subsidiary nozzle group G5 to the most upstream subsidiary nozzle group G1, and during the process, the control to shorten the subsidiary nozzle air discharge time is the most upstream with the subsidiary subsidiary nozzle group G5. Between the auxiliary nozzle groups G1 of, the delayed aeration discharge end timing of the auxiliary nozzles of the auxiliary nozzle groups is continuously repeated until it returns to the state before the change when the measured arrival time is longer than the target value.

If it is determined that the measured arrival time of the auxiliary nozzles 16 of the most upstream group G1 is longer than the target arrival time in step S90 (or if step S90 is No), this is the most upstream. It means that the air discharge time of the auxiliary nozzle 16 of the auxiliary nozzle group G1 of can not be shortened, and therefore the flow proceeds to step S91 in which the air discharge timing is returned to the state before the change or advancement.

Under the returned auxiliary nozzle air release end timing setting, the air discharge end timings of all the auxiliary nozzles 16 are finally determined. The setting method of the air discharge start and end timing of the main nozzle 1 and the auxiliary nozzle 16 is demonstrated below. The setting is performed in step S12 of the flowcharts of FIGS. 5 and 22. The purpose of setting the air discharge start and end timing of each group of the main nozzle 1 and the auxiliary nozzle 16 is to release the air from the main nozzle 1 and the auxiliary nozzle (while maintaining the weft arrival time at a predetermined value). It is to automatically adjust the opening and closing timing of the electromagnet valve 19 which controls the release of air from each group of 16). In other words, the object is to automatically set the air discharge start and end timings of the main nozzle 1 and the auxiliary nozzle 16 to know a predetermined arrival time of the picked weft which consumes the minimum air energy.

According to this embodiment, as shown in FIG. 3, the air discharge time of the subsidiary nozzle 16 is the minute time (in order from the subsidiary nozzle group G5 of the most downstream to the subsidiary nozzle group G1 of the upstream). Shortened by? T5 to? T1). The measurement and determination during the control operation are repeated continuously in the order of the auxiliary nozzle group G1 from the auxiliary nozzle group G5, and in the process, the air discharge time of the auxiliary nozzle 16 of the specific or control auxiliary nozzle group is shortened. The control operation to make it is repeated until the air discharge end timing of the auxiliary nozzle group returns to the changed state when the arrival time measured between the auxiliary nozzle groups G5 to G1 is longer than the target value. As a result, the flight change of the weft yarn (by shortening the secondary nozzle air release time) is performed only on the upstream side for the controlled secondary nozzle group. Thus, the air release time of all auxiliary nozzles is smoothly adjusted to the minimum amount of change required.

The minute times Δt5 to Δt1 may be set as follows. In the first control for the auxiliary nozzle groups G5 to G1, Δt5 = Δt4 = Δt3 = Δt2 = Δt1. After the second control, it is set to Δt5 ≠ Δt4 ≠ Δt3 ≠ Δt2 ≠ Δt1 with reference to the minute shortening time of the first control. As control proceeds repeatedly, the shortening of the subsidiary nozzle air discharge time of each subsidiary nozzle group is reduced to set the optimum air discharge amount of the small nozzle of each subsidiary nozzle group.

As shown in FIG. 24, in which the arrival of the picked weft with the sign La is detected by the weft arrival detector 23, the time Δt5 of the most downstream auxiliary nozzle group G5 will be long at a time. In this case, the measured arrival time is longer than the target arrival time, even if the air discharge end timing of the auxiliary nozzle 16 of the most downstream auxiliary nozzle group G5 is advanced. (The arrival time detected by the weft arrival detector 23 becomes the arrival timing Δt, which is later than the target arrival time to.) In such a situation, the air discharge timing of the auxiliary nozzles of the auxiliary nozzle groups G4 to G1. Shortening is impossible because of the need for correction of the abruptly shortened air discharge time of the auxiliary nozzles of the most downstream auxiliary nozzle group G5. Therefore, for any auxiliary nozzle group, it is not desirable to increase the extent of reducing the air discharge time at one time.

As shown in FIG. 25, when the control of the auxiliary nozzle air discharge end timing is made in the order from the most upstream auxiliary nozzle group G1 to the most downstream auxiliary nozzle group G5, the auxiliary nozzle in the upstream auxiliary nozzle group The setting of the air release end timing affects the setting of the auxiliary nozzle air release end timing of the downstream auxiliary nozzle group. For example, if the air discharge end timings of the auxiliary nozzle groups G1 to G4 are controlled as shown by the cut lines, respectively, the arrival time of the picked weft yarn is delayed arrival time later than the target arrival timing to. In order to prevent the delay to (Δt), it is necessary to increase the air discharge time of the most downstream auxiliary nozzle group G5. Therefore, it will be understood that it is not preferable that the control of the shortening of the auxiliary nozzle air discharge time is performed in the order from the most upstream auxiliary nozzle group G1 to the most downstream auxiliary nozzle group G5.

As shown in FIG. 26, when the auxiliary nozzle air discharge end timings of all the auxiliary nozzle groups G1 to G5 are controlled at the same time, the actual or measured arrival time of the picked weft yarns is the auxiliary nozzle of the upstream side auxiliary nozzle group. It depends on the air release time. Therefore, the arrival timing of the picked weft is delayed by the delayed arrival time Δt, which is later than the target arrival timing to. In the case of simultaneous control of all auxiliary nozzle groups G1 to G5, it should be understood that it is impossible to recognize which auxiliary nozzle group contributed to the arrival delay of the picked weft. Therefore, simultaneous control of all the auxiliary nozzle groups G1 to G5 is undesirable.

From the foregoing, in the fluid jet loom of the sixth embodiment, the air discharge time of the auxiliary nozzle is set continuously in the order of the downstream auxiliary nozzle group from the downstream auxiliary nozzle group, and therefore, at the position of the tip region of the picked weft yarn. It is possible to obtain a suitable air release time that matches, thereby smoothly setting the optimum weft picking state and it is possible to omit unnecessary air release time.

Claims (32)

A method of operating a fluid jet loom comprising a nozzle for inserting the weft yarn into the opening of the warp yarn under the influence of the fluid discharged through the nozzle to effect weft picking, the method according to the pressure change of the fluid discharged from the nozzle. Detecting data about an unwinding time of the finished weft yarn; counting characteristics of the nozzle according to the detected data; and setting a weft picking state in which the weft yarn is picked according to the nozzle characteristic. Characterized in that the method. 2. The method of claim 1 wherein the nozzle is a main nozzle to which weft yarns are fired to initiate weft picking. 3. The method of claim 2, wherein the setting of the weft yarn picking state sets at least one of an air discharge pressure of the main nozzle and a discharge timing of the main nozzle. 2. The method of claim 1, wherein the loom has a measuring and storage member to which the inserted weft yarn is wound to form a plurality of weft yarn skeins before being inserted into the warp opening. 5. The method of claim 4, wherein the data detection step detects the timing at which each skew of the wound weft yarn is released. 6. The method of claim 5, wherein said step of counting nozzle characteristics counts the weft feed rate during weft loosening and determines the relationship between the weft feed rate and the air pressure released from the nozzle. 7. A method according to claim 6, wherein the setting of the weft picking state sets the pressure of the air discharged through the nozzle according to the determined relationship between the weft feed rate and the air pressure suitable for weft picking. The loosening time data according to claim 1, wherein during the operation of the loom in which the weft yarn is inserted from the nozzle into the inclined opening under the rotation of the main shaft of the loom at a lower speed than the normal weaving operation in accordance with the change of the inclined beam. A detection step is performed. The method of claim 1, wherein the setting of the weft picking state sets the pressure of the fluid discharged through the nozzle in accordance with a coefficient equation including a proportional gain and sets the proportional benefit in accordance with nozzle characteristics. 10. The method of claim 9, wherein the step of counting nozzle characteristics counts the weft feed rate during the release time and determines a relationship between the weft rate and the fluid pressure discharged from the nozzle. 10. The method of claim 9, wherein the proportional gain setting step stores a proportional gain for the type of weft yarn inserted from the nozzle, and after storing the proportional gain, outputs a proportional gain for the type of weft yarn at the beginning of the loom operation. Characterized in that the method. 3. The apparatus of claim 2, comprising a plurality of auxiliary nozzles parallel to the passage of the weft yarn into which the loom is inserted and configured to release fluid to release the weft yarn from the main nozzle such that each auxiliary nozzle can perform weft picking. How to characterized. 13. The method of claim 12, wherein the setting of the weft picking state comprises setting a fluid discharge timing of each of the auxiliary nozzles in an order from an auxiliary nozzle located downstream to an auxiliary nozzle located upstream. And timing emitted from the auxiliary nozzle. 14. The fluid discharge timing setting method according to claim 13, wherein the step of setting the fluid discharge timing includes selecting a fluid discharge end timing of each subsidiary nozzle according to the order, wherein the fluid discharge end timing is a timing at which fluid discharge from the subsidiary nozzle ends. How to. The method of claim 1, wherein the step of setting the fluid discharge timing sets the fluid discharge timing according to the arrival time of the picked weft yarn. The method according to claim 1, wherein at least some of the release time data detection step, the nozzle characteristic counting step and the weft picking state setting step are performed by a microcomputer mounted on the loom. In a fluid jet loom, a nozzle for inserting the weft yarn into the inclined opening under the influence of the fluid discharged through the nozzle to achieve weft picking, and during the unwinding time of the inserted weft yarn according to the pressure change of the fluid discharged from the nozzle. Means for detecting data, means for counting characteristics of the nozzle in accordance with the detected data, and means for setting the weft picking state in accordance with the nozzle characteristics, wherein the weft yarn is picked under the weft picking state. A fluid jet loom characterized by the above-mentioned. 18. The fluid jet loom of claim 17, wherein the nozzle is a main nozzle from which weft yarns are fired to initiate weft picking. 19. The fluid jet loom of claim 18, wherein said weft picking condition setting means comprises means for setting at least one of an air discharge pressure of said main nozzle and an air discharge timing of said nozzle. 20. The fluid jet loom of claim 19, comprising a weft measurement and storage device comprising a member wound to form a plurality of tufts of weft yarn before the inserted weft yarn is inserted into the warp opening. 21. The fluid jet loom of claim 20, wherein said data detection means comprises means for detecting the timing at which each skein of the wound weft yarn is released. 22. The method of claim 21 wherein said nozzle characteristic counting means comprises means for counting the weft feed rate during said release time and means for determining a relationship between said weft feed rate and air pressure released from the nozzle. A fluid jet loom characterized by the above-mentioned. 23. The method of claim 22, wherein the weft picking state setting means comprises means for setting a pressure of air suitable for weft picking discharged through the nozzle according to a determined relationship between the weft supply means and the air pressure. Fluid jet loom. 18. The release timing according to claim 17, wherein the weaving yarn is detected during the operation of the loom in which the weft yarn is inserted from the nozzle into the inclined opening under the rotation of the loom spindle at a lower speed than the normal weaving operation in the gating operation according to the change of the inclined beam. A fluid jet loom comprising means for. 18. The apparatus of claim 17, wherein the weft picking state setting means includes means for setting the pressure of the fluid discharged through the nozzle according to a coefficient equation including the proportional gain and setting the proportional gain in accordance with the characteristics of the nozzle. Fluid jet loom, characterized in that. 26. The method of claim 25, wherein said nozzle characteristic counting means comprises means for counting the weft feed rate during the release time and means for determining the relationship between the weft feed rate and the pressure of the fluid discharged from the nozzle. Fluid jet loom. 26. The gain as claimed in claim 25, wherein the proportional gain setting means stores the proportional gain with respect to the type of weft yarn inserted from the nozzle and is proportional to the type of the weft yarn at the beginning of loom operation after storing the proportional gain. Fluid jet loom, characterized in that for outputting. 19. The method of claim 18, comprising a plurality of auxiliary nozzles parallel to the passage of the inserted weft yarn and configured to release fluid to release the weft yarn from the main nozzle such that each auxiliary nozzle can perform weft picking. Fluid jet loom. 29. The apparatus of claim 28, wherein the weft picking state setting means comprises means for setting the fluid discharge timing of each of the auxiliary nozzles in an order from an auxiliary nozzle located downstream to an auxiliary nozzle located upstream. And a timing discharged from the auxiliary nozzle. 30. The fluid discharge timing setting device according to claim 29, wherein the fluid discharge timing setting means includes means for setting the fluid discharge end timing of each auxiliary nozzle in the order and the fluid discharge end timing is a timing at which discharge of the fluid from the auxiliary nozzle is terminated. Fluid jet loom, characterized in that. 18. The fluid jet loom of claim 17, wherein said fluid discharge timing setting means comprises means for setting said fluid discharge timing in accordance with a timing of arrival while the weft yarn is picked. 18. The fluid jet loom according to claim 17, wherein at least part of said release time data detecting means, nozzle characteristic counting means, and weft picking state setting means are constituted by a microcomputer.