JPH04281047A - Starting method in jet loom - Google Patents

Abstract

PURPOSE:To prevent weaving bar development due to the slow reversed or slow normal rotation during frame shutdown by one-shot picking at a pressure lower than the set pressure in weaving prior to resuming the weaving. CONSTITUTION:When mispicking occurs during weaving in a jet loom, a control computer puts a frame to shutdown and, before the slow reverse rotation of a frame motor for treating mispicked yarn, commands the slow normal rotation of feed motor and winding motor; thereby, cloth fell is moved at a specified level from its normal position toward woven fabric side. Then the frame motor is reversely rotated to form the maximal opening for warps and the mispicked yarn is treated, said feed motor and winding motor are then reversely rotated to return the cloth fell to its normal position. Subsequently, prior to resuming weaving, a weft is picked at a pressure lower than the set pressure in the weaving to avoid a blow breakage in one-shot picking, thus preventing the developments of weaving flaws due to yarn breakage and/or lateral streaks due to yarn misbeating in the slow reversed rotation.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for starting a weaving machine in a jet loom, and more particularly to a method for preventing the occurrence of weaving stages due to slow reverse rotation or slow forward rotation of a weaving stand in a jet loom while weaving is stopped.

0002

[Prior Art] When a loom is restarted after it has been stopped manually or due to warp breakage, the beating strength is insufficient due to the stand-up characteristics of the loom, and thin steps tend to occur in the woven fabric. . In addition, if the loom is stopped due to a weft insertion error, the loom is slowly reversed to remove the erroneous thread, and then the loom is restarted. During slow reversal, the fabric structure near the front immediately after weaving loosens, and the front moves toward the rear of the loom from its original position, which tends to cause thick steps.

Means for preventing the occurrence of such weaving steps are disclosed in Japanese Patent Application Laid-open No. 60-231849 and Japanese Patent Application Laid-open No. 61-55.
This method is disclosed in Japanese Patent Application Laid-open No. 241, Japanese Patent Application Laid-open No. 62-263352, and Japanese Utility Model Application No. 63-94988.

0004

[Problems to be Solved by the Invention] There is a type of weave tier called a so-called twill pillow. When the front of the woven fabric is struck by the reed due to slow reverse rotation or slow forward rotation of the loom table while weaving is stopped, the weft threads on the front shift in the vertical direction of the woven fabric, causing this weaving area to move on the woven fabric. It rises like a pillow. Although such twill pillows are likely to occur in twill fabrics, the above-mentioned conventional weaving step generation prevention means cannot prevent the occurrence of twill pillows.

SUMMARY OF THE INVENTION An object of the present invention is to provide a start-up method that also prevents the occurrence of weaving steps in a jet loom where weft insertion errors are more likely to occur than in other looms.

[0006]

[Means for Solving the Problems] To solve this problem, in the first invention, one weft is injected and inserted before restarting weaving using a set pressure lower than the set pressure during weaving. In the second invention, the front of the weaving machine is moved from its normal position to the woven cloth side in advance before the slow reversal of the machine table for removing the weft inserted from the front of the weft immediately before stopping weaving. After reversing the speed of the table, the weaving cloth is returned to its normal position, and the weft inserted just before weaving is stopped is removed from the weaving cloth, and a new weft is replaced by a new weft at a pressure lower than the pressure set during weaving. One weft thread is inserted into the weft thread.

[0007]

[Operation] To remove the weft inserted from the weaving front just before weaving stops, slowly reverse the machine to maximize the warp opening.
It is necessary to release the woven state of the weft threads. During this machine operation, the reed hits the fabric front, causing the weft threads on the fabric fabric to shift in the vertical direction of the woven fabric. After removing this weft yarn and inserting a new weft yarn at a pressure lower than the pressure set during weaving, the reed is moved to a position suitable for restarting weaving. If a new weft is not inserted in place of the removed weft, it is necessary to slowly reverse the loom table one or more times in order to move the reed to a position suitable for restarting weaving. This slow reversal causes the reed to hit the Orimae, resulting in an Ayamakura. By inserting a new weft yarn in place of the removed weft yarn, it is possible to prevent the reed from passing through the front during the process of moving the reed to a position suitable for restarting weaving, thereby preventing the occurrence of twill pillows. can.

[0008] In order to prevent the weft from coming off from the main weft insertion nozzle, a fine jet is applied to the weft, but this fine jet causes the weft to untwist. This untwisting leads to a decrease in the strength of the weft yarn, which causes yarn breakage due to the weft insertion jet action. Yarn breakage can be prevented by lowering the set pressure during weft insertion to prevent the occurrence of twill than the set pressure during weaving. Furthermore, by lowering the set pressure of the auxiliary weft insertion nozzle, it is possible to prevent yarn breakage during or after flying.

[0009] In the second invention, when the machine machine throw is reversed to remove weft threads, the loom escapes from the reed beating position to the woven fabric side, and there is a slight problem in that the woven fabric is struck by hitting the missed yarn during the machine machine slow reverse. It is also possible to reliably prevent the occurrence of curly hair.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment embodying the first invention will be described below with reference to FIGS. 1 to 14. FIG. 2 schematically shows a side view of the entire loom. M is a machine motor, and the machine motor M is under the operation control of the main control computer C0. 1
is a forward/reverse reversible forwarding motor independent of the machine motor M, and the forwarding motor 1 drives the warp beam 2. The warp threads T sent out from the warp beam 2 are passed through a heddle 5 and a modified reed 6 via a back roller 3 and a tension roller 4. Woven fabric W has expansion bar 7,
It is wound up onto a cross roller 11 via a surface roller 8, a press roller 9, and a wrinkle removal guide member 10.

The tension roller 4 is the tension lever 1
It is attached to one end of 2, and the tension lever 1
A predetermined tension is applied to the warp threads T by a tension spring 13 attached to the other end of the warp threads T. The tension lever 12 is rotatably supported at one end of the detection lever 14, and a load cell 15 is mounted at the other end of the detection lever 14.
are connected. The warp tension is transmitted to the load cell 15 via the tension roller 4, tension lever 12, and detection lever 14, and the load cell 15 outputs an electric signal corresponding to the warp tension to the main control computer C0.

The main control computer C0 compares the tension set in advance with the detected tension detected by the input signal, and based on the warp beam diameter detected by the detection signal from the rotary encoder 16 for detecting the rotation angle of the machine. The rotation speed of the feed motor 1 is controlled. As a result, the warp tension during normal operation is controlled, and the occurrence of weaving steps during weaving is prevented.

The main control computer C0 commands forward rotation of the feed motor 1 based on the ON signal from the start switch 17, and rotates the feed motor 1 based on the rotational speed detection signal from the rotary encoder 1a incorporated in the feed motor 1. 1's rotational speed is feedback controlled. The surface roller 8 is operatively connected to a winding motor 18 which is independent from the machine motor M and is capable of forward and reverse rotation. The main control computer C0 feedback-controls the rotational speed of the winding motor 18 based on a rotational speed detection signal from a rotary encoder 18a built into the winding motor 18.

FIG. 1 schematically shows a front view of a weft insertion device. 19 is a winding type weft length measuring and storage device. The weft Y whose length has been measured and stored in the weft length measuring and storage device 19 is ejected from the main weft insertion nozzle 20 and is then transferred to the relay jets of a plurality of weft insertion auxiliary nozzle groups 21, 22, 23, and 24. A weft detector 25 consisting of a reflective photoelectric sensor is installed at the end of the weft, and information for determining whether the weft Y has reached the tip is obtained by the weft detector 25.

Unwinding and stopping the weft from the winding surface 19a of the weft length measuring and storage device 19 is performed by excitation and demagnetization of the electromagnetic solenoid 26 that drives the locking pin 26a. The excitation/demagnetization control of the electromagnetic solenoid 26 is performed by the auxiliary control computer C.
1, and the auxiliary control computer C
1 controls excitation and demagnetization of the electromagnetic solenoid 26 based on machine rotation angle detection information obtained from the main control computer C0.

A weft unwinding detector 27 consisting of a reflective photoelectric sensor is installed near the bobbin winding surface 19a, and the weft unwinding detector 27 detects the weft yarn Y pulled out from the bobbin winding surface 19a and unwound. be done. Auxiliary control computer C1
is the number of unwounds detected by the weft unwinding detector 27 is the set number N
When reaching this point, the electromagnetic solenoid 26 is commanded to be demagnetized, and the locking pin 26a engages with the yarn winding surface 19a to prevent the weft from being pulled out and unwound.

Pressure air injection for weft insertion from the main weft insertion nozzle 20 is controlled by excitation and demagnetization of a solenoid valve V1, and pressurized air injection from the auxiliary weft insertion nozzle groups 21 to 24 is controlled by electromagnetic valves V2, V3, V4, and V5. Controlled by excitation and demagnetization. The electromagnetic valve V1 is connected to the pressure air supply tank 28, and the pressure in the pressure air supply tank 29 is regulated by an electric pressure control valve 33. The electromagnetic valves V2 to V4 are connected to a pressure air supply tank 29, and the pressure within the pressure air supply tank 29 is regulated by an electric pressure control valve 34. The solenoid valve V5 is further connected to another pressure air supply tank 30,
The pressure inside the pressure air supply tank 30 is controlled by an electric pressure control valve 3.
Adjusted by 5. Each electromagnetic valve V1, Vi (i
The excitation/demagnetization control of =2 to 5) is performed by the auxiliary control computer C2.
Each electric pressure control valve 33 to 3
The drive control of No. 5 is performed by instructions from the auxiliary control computer C3.

The auxiliary control computer C2 controls the excitation and demagnetization of each electromagnetic valve V1, Vi based on the machine rotation angle detection information obtained from the main control computer C0, and the auxiliary control computer C3 controls the pressure detectors 36, 37, 38.
Each electric pressure control valve 3
3 to 35 are driven and controlled. Excitation and demagnetization control of the solenoid valves V1 and Vi is performed from the solenoid valve V1 side in a relay-like manner,
Data for this relay excitation/demagnetization control is input to the main control computer C0 by the input device 31.

The main nozzle 20 for weft insertion has a breeze pipe 4.
3 is connected, and a check valve 44 is interposed on the breeze pipe 43. Low-pressure air is constantly supplied to the breeze pipe 43, and the main nozzle for weft insertion 20 makes a slight injection when the air is not used for injection for weft insertion. This fine spray prevents the thread from coming off from the main weft insertion nozzle 20, and this prevention of thread coming off is also performed when the loom is stopped.

The drive control of the electric pressure control valves 33 to 35 is controlled with the set pressure inputted to the auxiliary control computer C3 as the target. This set pressure data for drive control is input to the control computer C0 by the input device 31, and the main control computer C0 transfers this input data to the auxiliary control computer C3. A weft processing device 32 is installed directly above the main nozzle 20 for weft insertion. The weft processing device 32 is of the same type as the weft processing device disclosed in Japanese Unexamined Patent Publication No. 2-61138, and prevents weft insertion of a weft following a weft that has been erroneously inserted, and uses this subsequent weft as a clue to weave a woven fabric. To automatically pull out and remove the wrong yarn on the woven fabric W1 of W. This weft insertion error process is controlled by the main control computer C0.

The flowcharts in FIGS. 9 to 14 represent a weft insertion error processing program and a twill pillow occurrence prevention program. Information such as excitation/demagnetization timing, injection pressure, weft type, weaving width, etc. necessary for carrying out the twill pillow generation prevention program is inputted to the main control computer C0 by the input device 31. The main control computer C0 transfers the relay excitation/demagnetization timing information of the electromagnetic valves V1 and Vi for preventing the occurrence of twilling to the auxiliary control computer C2, and also controls the excitation timing information of the electromagnetic solenoid 26 for preventing the occurrence of twilling. Transfer to computer C1. moreover,
The main control computer C0 is the main nozzle 20 for weft insertion.
And the set injection pressure information of the weft insertion auxiliary nozzle groups 21 to 24 is transferred to the auxiliary control computer C3.

The twill pillow generation prevention control will be explained below based on the flowcharts shown in FIGS. 9 to 14. When a weft insertion error occurs, the main control computer C0 detects the weft thread detector 25.
Based on the abnormality detection information from the machine, a command is given to stop the operation of the machine motor M, the feed motor 1, and the take-up motor 18. Each motor M, 1, 18 has curves D1, D2, D3 in Figure 8.
As shown in FIG. 3, the deformed reed 6 stops synchronously, the warp feeding and the fabric winding stop, and the deformed reed 6 stops at the position immediately before the reed beating shown in FIG. Signal S1 in FIG. 8 is a weaving stop signal.

When a weft insertion error occurs, each motor M, 1
, 18 are stopped, the weft processing device 32 is activated, and the insertion of the weft following the missed yarn Y1 is prevented. Each motor M, 1, 18 has curves D4, D5, D6 after stopping.
Reverse the speed as shown in . Due to this slow reversal, the machine table is reversed about one and a half times, and the warp threads T form the maximum opening as shown in FIG. Due to this opening formation, the misplaced yarn Y1 on the woven fabric front W1 is released from the gripping action of the warp thread T, and by the drawing action of the weft yarn processing device 32 using the following weft as a clue, the erroneous yarn Y1 on the woven fabric fabric front W1 is moved from the woven fabric fabric front W1 to the warp thread. The drawer is pulled out to the side of the opening and removed.

During the transition from the position shown in FIG. 3 to the position shown in FIG. 4, the deformed reed 6 passes through the normal position P of the woven cloth W1, that is, the reed beating position. Therefore, the miss yarn Y1 on the woven fabric W1 is struck by the deformed reed 6, and the miss yarn Y1 is shifted in the vertical direction of the woven fabric W. Although such a weft yarn weaving state causes twill pile, since the erroneous yarn Y1 is pulled out and removed by the weft yarn processing device 32, the erroneous yarn Y1 does not cause the twill pile.

The warp threads T are slowly pulled back by the synchronized slow reverse rotation of each motor M, 1, 18, and the woven fabric W
is slowly rewound. The amount of slow pullback and the amount of slow rewinding are the same, and the fabric W1 undergoes a positional displacement corresponding to the amount of slow reversal of the machine base. When the weft insertion error processing is completed, the main control computer C0 outputs the activation signal S2.
Prepare for input. When the start signal S2 is input by turning on the start switch 17, the main control computer C0
outputs a reference signal S3 for starting one-shot weft insertion to the auxiliary control computers C1, C2, and C3. The auxiliary control computer C1 stops the excitation/demagnetization control of the electromagnetic solenoid 26 in response to the weaving stop signal S1 obtained from the main control computer C0, and prepares for the input of the reference signal S3. When the reference signal S3 is input, the auxiliary control computer C1 energizes the electromagnetic solenoid 26 after a predetermined period of time. This excitation causes the locking pin 26a to move to the bobbin winding surface 19.
a, and the weft can be pulled out and unwound from the thread winding surface 19a.

The auxiliary control computer C3 drives and controls the electric pressure control valves 33, 34, and 35 based on the reference signal S3 input from the main control computer C0. Before the weft insertion error occurs, the electric pressure control valves 33 to 35 set the pressure of each pressure air supply tank 28, 29, and 30 to the set pressure P1.
1, P21, and P31, and for weft insertion during weaving, the injection pressure is P11 in the main weft insertion nozzle 20, the injection pressure P21 in the auxiliary weft insertion nozzle groups 21 to 23, and the auxiliary weft insertion nozzle. This is done by injection pressure P31 in group 24. Auxiliary control computer C3
is the set pressure P11, P2 in response to the reference signal S3 input.
1. Change P31 to P12, P22, P32. By this change control, the pressure in the pressure air supply tanks 28 to 30 decreases from the pressure shown by straight lines P11, P21, and P31 in FIG. 8 to the pressure shown by straight lines P12, P22, and P32.

The auxiliary control computer C2 stops the excitation/demagnetization control of the electromagnetic valves V1 and Vi in response to the weaving stop signal S1 obtained from the main control computer C0, and prepares for the input of the reference signal S3. Reference signal S
3, the auxiliary control computer C2 performs one-shot relay excitation/demagnetization control of the electromagnetic valves V1 and Vi at a predetermined timing after a predetermined period of time.

Curve E in FIG. 8 represents one-shot excitation and demagnetization of the electromagnetic solenoid 26, and curve F1 represents excitation and demagnetization of the electromagnetic valve V1. Further, a curve Fi (i=2 to 5) represents one-shot excitation and demagnetization of each electromagnetic valve Vi. The weft Y2 is inserted in one shot as shown in FIGS. 5 and 6 by excitation/demagnetization control represented by curves E, F1, and Fi in FIG. The injection pressure of the weft insertion main nozzle 20 during one-shot weft insertion is set at a set pressure P12 lower than the set pressure P11 during weaving. Even when the loom is stopped, the main nozzle for weft insertion 20 is injecting a small amount of air by the pressure air supplied from the breeze pipe 43, and the tip of the weft yarn Y2 is still being ejected by the main nozzle for weft insertion 20 even when the loom is stopped. has been done. This fine ejection brings about untwisting of the weft yarn, and if the weft yarn is subjected to the fine ejection over a relatively long period of time when the loom is stopped, the untwisting of the weft yarn becomes large and the yarn strength decreases. Therefore, when one shot of weft insertion is attempted from the main weft insertion nozzle 20 using the injection pressure during normal weaving, the tip of the weft yarn Y2 is blown off. In particular, the pressure in the pressurized air supply tank 28 when weaving is stopped will be higher than the set pressure P11 during weaving unless the pressure control valve 33 is changed, and the weft Y2 inserted in one shot will be at the set pressure P11 during weaving. Weft insertion will be performed with a higher injection pressure.

However, during one-shot weft insertion, the pressure in the pressure air supply tank 28 is reduced to the set pressure P1 during weaving.
1 to set pressure P12, the weft Y2 is ejected from the weft insertion main nozzle 20 at a lower injection pressure than during weaving. Therefore, by appropriately setting the set pressure P12, it is possible to avoid blow-out at the start of one-shot weft insertion.

In the weft insertion auxiliary nozzle groups 21 to 24, the injection pressure is also lower than during weaving, and the weft yarn Y2 is relay-pulled with a weaker force than during weaving. Therefore,
Even during flying, the weft Y2 is prevented from breaking. Curve G in FIG. 8 represents the weft unwinding detection signal. When the detected weft unwinding number n from the weft unwinding detector 27 reaches the set number N, the auxiliary control computer C1 demagnetizes the electromagnetic solenoid 26. Due to this demagnetization, the locking pin 26a engages with the bobbin winding surface 19a, thereby preventing the weft thread from being pulled out and unwound.

[0031] Weft yarn Y2 is beaten first after resuming weaving.
is applied with tension by the jet action of the weft insertion auxiliary nozzle group 24 until the initial stage when weaving is restarted. The weft yarn Y2, which has been inserted one shot, is kept in a good posture within the weft insertion passage 6a of the modified reed 6 by this application of tension as shown by the arrow R in FIG. 5, and is beaten in this good posture. Therefore, the weft yarn Y2 is not beaten in a loose state that is likely to cause weaving damage. Furthermore, there is no possibility that the weft yarn Y2 will come off from inside the weft insertion passage 6a.

The injection pressure of the auxiliary weft insertion nozzle group 24 that acts on the tip of the weft yarn Y2 to apply tension is a injection pressure P32 lower than that during weaving. The tip of the weft yarn Y2 that has reached the weft insertion end side is also exposed to the jetting action of the weft insertion auxiliary nozzle group 24 for a relatively long time, and is likely to become untwisted. If this injection pressure is high, tear-offs are likely to occur, and if weaving is restarted with the tear-offs still occurring, weaving flaws will occur. However, by lowering the injection pressure of the weft insertion auxiliary nozzle group 24 to the extent that yarn breakage does not occur while ensuring the necessary tension applied to the weft yarn Y2, it is possible to obtain a good posture of the weft yarn Y2.

Note that the pressure in the pressurized air supply tank 30 will also be higher than the set pressure P31 during weaving unless the pressure control valve 35 is changed, and the tip of the weft yarn Y2, which has been inserted one shot, will be It is exposed to an injection pressure higher than the set pressure P31. Therefore, by pressure control, the set pressure P32 during one shot weft insertion is changed to the set pressure P3 during weaving.
However, depending on the type of yarn, this level of injection pressure reduction control may be sufficient.

When the weft yarn Y2 inserted in one shot is detected by the weft yarn detector 25, the main control computer C0 controls the machine motor M, the feed motor 1, and the take-up motor 18 as shown in FIG. 8 based on this detection information. Curve D7,
Slow forward rotation is performed synchronously as shown by D8 and D9. This synchronous slow normal rotation moves the deformed reed 6 from the position shown in FIG. 6 to the position suitable for restarting weaving as shown in FIG. The suitable position for restarting weaving is the position immediately before reed beating, and by swinging the modified reed 6 from this position, the first weft insertion and reed beating after restarting weaving can be smoothly performed. It will be done. During this slow forward rotation, the deformed reed 6 does not pass through the reed beating position P, and the woven cloth W1 is not struck by the deformed reed 6.

[0035] If one shot of new weft yarn Y2 is not inserted in place of the removed error yarn Y1 (that is, if weft yarn Y2 is omitted from Fig. 6), the state is transformed to a position suitable for restarting weaving. To transfer reed 6, use wrong thread Y1
The weft yarn Y3, which was inserted earlier, must be pulled back to the beating position P. Therefore, the machine is set to weft Y3
The reed must be reversed to the position before the reed, and the deformed reed 6
passes through the beating position P. Therefore, the new weft Y2
If the weft is not inserted one shot, the deformed reed 6 will hit the loom W1 during the slow reversal to the weaving restart position.
Aya pillow occurs.

If the weft yarn Y2 is inserted one shot in place of the missed yarn Y1, the weft yarn Y2 inserted one shot may be pulled back to the beating position P when weaving is restarted. In this case, the rotation of the machine is slow forward rotation,
Since the position before the reed beating becomes the restart position, the modified reed 6 does not pass through the reed beating position P. Therefore, Orimae W1
is not struck by the deformed reed 6, and no twilling occurs.

[0037] The restart position of the loom can be freely set, and it is not limited to the case where the loom shifts to the forward rotation direction, but may also be set in the reverse direction.Also, the restart position of the loom can be set directly from the position where one shot weft insertion was performed. It's okay. Furthermore, even when shifting in the forward and reverse directions, the amount of shift can be freely set, and in any case, the restart position can be set without the modified reed 6 passing through the beating position P.

When the modified reed 6 moves to the weaving restart position shown in FIG.
, C3. The auxiliary control computer C3 controls each electric pressure control valve 33 in response to the input of the reference signal S4.
~35 to change the set pressure of each pressure air supply tank 28~30 from P12, P22, P32 to P11, P2.
1. Change to P31.

The auxiliary control computer C1 receives the reference signal S
4, the weaving excitation/demagnetization control of the electromagnetic solenoid 26 is performed. The auxiliary control computer C2 demagnetizes the electromagnetic valve V5 in response to the input of the one-shot weft insertion end reference signal S4, and shifts to weaving relay excitation/demagnetization control of the electromagnetic valves V1 to V5.

The main control computer C0 is shown in FIG.
As shown by curves D10, D11, and D12, the machine motor M, the feed motor 1, and the take-up motor 18 are synchronously started to rotate normally, and weaving is restarted. In addition, Japanese Patent Application Publication No. 5
Japanese Patent Application No. 8-197350 discloses a method for starting a one-shot weft insertion method prior to resuming weaving in a jet loom. However, this one-shot weft insertion system is aimed at reducing weft insertion troubles when weaving is resumed so that weaving can be resumed smoothly, and the purpose and effect of preventing the occurrence of twill piles are not disclosed at all.

FIGS. 15 to 20 show an embodiment of the second invention, and the flowcharts in FIGS. 17 to 20 represent a weft insertion error processing program and a weft stack generation prevention program in the main control computer C0. The device configuration and the control functions of the auxiliary control computers C1, C2, and C3 are the same as in the previous embodiment, but the control function of the main control computer C0 is different from the previous embodiment.

[0042] When a weft insertion error occurs, each motor M, 1
, 18 stop synchronously as shown by curves D1, D2, and D3 in FIG. 16, and the modified reed 6 stops just before the reed beating. After the machine is stopped, the main control computer C0 inputs and sets the set amount Q using the input device 31 as shown by the curve D4.
At the same time, the feed motor 1 is commanded to perform slow forward rotation by an amount R+, as shown by curve D5, and at the same time, the take-up motor 18 is commanded to perform slow forward rotation by a set amount R+ inputted by the input device 31, as shown by curve D5. That is, prior to the slow reverse rotation of the machine motor M by a predetermined amount to correct weft insertion errors, the feed motor 1 is rotated slowly forward by a predetermined amount Q+, and the take-up motor 18 is rotated slowly forward by a predetermined amount R+. . Due to the slow normal rotation of both motors 1 and 18, the warp threads T are slowly fed out by a predetermined amount ρ, and the woven fabric W
is slowly wound up by a predetermined amount ρ. Due to the slow feeding and slow winding, the woven fabric W1 moves from the normal position P to the woven fabric W side by a predetermined amount ρ, as shown in FIG.

[0043] Feeding motor 1 and take-up motor 18
After a predetermined amount of slow forward rotation, the motor M changes to curve D6 in FIG.
As shown in the figure, there is a slow reversal, and the machine rotates about one and a half times. Due to this slow reversal, the deformed reed 6 moves from the position shown by the solid line in FIG. 15 to the most retracted position shown by the chain line, and the warp threads T form the maximum opening. By forming this opening, the woven fabric W1
The upper erroneous yarn Y1 is released from the gripping action of the warp threads T, making it possible to process the erroneous weft insertion. The feed motor 1 and the take-up motor 18 are slowly reversed in synchronization with the slow reverse rotation of the machine motor M, as shown by curves D7 and D8.

After the maximum opening is formed, the feed motor 1 is slowly reversed by a predetermined amount Q as shown by curve D9 in FIG.
are synchronized and reversed slowly by a predetermined amount R. Both motors 1,
18, the warp threads T are slowly pulled back by a predetermined amount ρ, the woven fabric W is slowly rewound by a predetermined amount ρ, and the cloth facing W1 is displaced and returned to the normal position P.

After Orimae W1 returns to the normal position P,
The process of removing the misplaced yarn Y1, the one-shot weft insertion of a new weft yarn Y2, and the restart of weaving are performed in the same manner as in the previous embodiment. As explained in the above embodiment, while the deformed reed 6 moves from the stop position shown by the solid line in FIG. 15 to the most retracted position shown by the chain line in FIG. Then, it passes through the regular position, that is, the beating position P. Therefore, when the woven fabric W1 is at the beating position P, the woven fabric W1
is struck by the modified reed 6. However, since the woven fabric W1 escapes from the reed beating position P to the woven fabric W side prior to the slow reversal of the machine machine for processing a weft insertion error, the woven fabric W1 is not struck by the deformed reed 6. Therefore, the weft yarn Y3 is inserted earlier than the miss yarn Y1.
. That is, the prevention of twilling in this embodiment is more reliable than in the previous embodiment.

The present invention can also be implemented as shown in FIG. In this embodiment, each pressure air supply tank 28-3
The pressure control valves 39, 40, and 41 connected to the main weft insertion nozzle 20 are of a manual type, and a manual pressure control valve 42 is connected to the weft insertion main nozzle 20 via a solenoid valve V6 and a check valve 45. ing. The pressure control valve 42 is a solenoid valve V
The pressure of the pressurized air supplied to the main nozzle 20 for weft insertion via the main nozzle 20 is adjusted to be lower than the pressure of the pressure air supply tank 28, and the solenoid valve V6 is excited and demagnetized during one-shot weft insertion. Ru. As a result, injection from the weft insertion main nozzle 20 during one-shot weft insertion is performed at a lower pressure than the injection pressure during weaving. Therefore, yarn breakage in the weft insertion main nozzle 20 similar to the embodiment described above is prevented.

Furthermore, the present invention can be applied not only to preventing the occurrence of twilling, but also to implementing one-shot weft insertion to avoid weft insertion troubles at the time of restart, as disclosed in Japanese Patent Laid-Open No. 197350/1983. It is.

[0048]

Effects of the Invention As detailed above, in the first invention, one weft is injected and inserted before resuming weaving with a set pressure lower than the set pressure during weaving, so one shot weft insertion is achieved. There is also no breakage of the weft yarns, which is advantageous in that it is possible to prevent weaving damage caused by breakage.

[0049] In the second invention, the front is moved from its normal position to the woven fabric side in advance before the machine slow reverses to remove the weft inserted from the front immediately before weaving is stopped. ,
Returning the fabric to the normal position after the machine slow reverses,
After the weft inserted just before stopping weaving is removed from the front, one new weft is injected and inserted to replace the removed weft using a lower set pressure than during weaving. It has the excellent effect of reliably preventing the occurrence of slight twilling due to hitting a missed thread during machine slow reversal.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view incorporating a circuit for controlling one-shot weft insertion.

FIG. 2 is a schematic side view of the entire loom.

FIG. 3 is an enlarged side view showing the weaving state of mis-threads.

FIG. 4 is an enlarged side view showing a state in which the woven state of mis-woven threads is released.

FIG. 5 is a schematic front view showing a one-shot weft insertion state.

FIG. 6 is an enlarged side view showing a one-shot weft insertion state.

FIG. 7 is an enlarged side view showing the modified reed moved to the weaving restart position.

FIG. 8 is a graph showing pressure control and excitation/demagnetization control for one-shot weft insertion.

FIG. 9 is a flowchart showing a weft insertion processing program and a one-shot weft insertion control program of the first invention.

FIG. 10 is a flowchart showing a weft insertion processing program and a one-shot weft insertion control program of the first invention.

FIG. 11 is a flowchart showing a weft insertion processing program and a one-shot weft insertion control program of the first invention.

FIG. 12 is a flowchart showing a weft insertion processing program and a one-shot weft insertion control program according to the first invention.

FIG. 13 is a flowchart showing a weft insertion processing program and a one-shot weft insertion control program of the first invention.

[Fig. 14] Weft insertion processing program ROM of the first invention and 1
3 is a flowchart representing a shot weft insertion control program.

FIG. 15 is an enlarged side view showing the displacement of the woven fabric in the second invention.

FIG. 16 is a graph showing pressure control and excitation/demagnetization control for one-shot weft insertion.

FIG. 17 is a flowchart showing a weft insertion processing program and a one-shot weft insertion control program according to the second invention.

FIG. 18 is a flowchart showing a weft insertion processing program and a one-shot weft insertion control program according to the second invention.

FIG. 19 is a flowchart showing a weft insertion processing program and a one-shot weft insertion control program according to the second invention.

FIG. 20 is a flowchart showing a weft insertion processing program and a one-shot weft insertion control program according to the second invention.

FIG. 21 is a side body front view showing another example.

[Explanation of symbols]

20...Main nozzle for weft insertion, 21-24...Auxiliary nozzle group for weft insertion, Y1...Miss yarn, Y2...Weft yarn, W1...
Orimae, C0...Main control computer, C1, C2, C3
...Auxiliary control computer.

Claims (2)

[Claims] [Claim 1] In a jet loom where a weft is inserted by the jetting action of a weft insertion nozzle, one weft is injected and inserted before weaving is restarted at a set pressure lower than the set pressure during weaving. Method. [Claim 2] In a jet loom where the weft is inserted by the jet action of the weft insertion nozzle, the weft is removed from the weft in advance before the slow reversal of the machine to remove the weft inserted from the weft just before weaving is stopped. is moved from its normal position to the weaving fabric side, and after the machine table slows are reversed, the weaving front is returned to its normal position, and the weft inserted just before weaving is stopped is removed from the weaving front, and then during weaving. A method for starting a jet loom in which one new weft is injected to replace the removed weft at a set pressure lower than the set pressure in the jet loom.