JPH04289245A - One-shot weft-insertion in jet loom - Google Patents

Abstract

PURPOSE:To prevent the generation of twill butt and weft-insertion miss by removing a weft inserted immediately before the stop of a loom, inserting a new weft longer than the prescribed weft-insertion length in weaving by one-shot weft-insertion and restarting the weaving. CONSTITUTION:When a weft-insertion miss is generated in a jet loom, the operation of the loom is stopped by a controlling computer Co based on the abnormality detection information, a delivery motor 1 and a winding motor 18 are slowly rotated in normal direction to shift the cloth fell W1 from the normal position toward the side of woven cloth W by a prescribed length and the machine motor M is slowly rotated in reverse direction to maximize the opening width of warp T. The delivery motor 1 and the winding motor 18 are slowly rotated in reverse direction to return the cloth fell W1 to the normal position and the abnormal yarn is removed by prescribed procedure. A new weft longer than the prescribed weft-insertion length in weaving is inserted in place of the above removed weft and the weaving operation is restarted. Even if the tip end of the new weft is blown off, the weft end avoids the weft- insertion miss reaching the end of the weaving width and prevents the generation of twill butt.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-shot weft insertion method in a jet loom, and more particularly to a method for preventing the occurrence of weaving steps due to slow reverse rotation or slow forward rotation of a machine stand during weaving stoppage.

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 one-shot weft insertion method that prevents the occurrence of such 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] In order to solve the problem, in the first invention, before the start of the weaving operation, one weft yarn longer than the weft insertion length during weaving is inserted by the jetting action, and the farthest reaching position of this weft yarn is was set farther than the furthest reach position of the weft 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 table throw, the weaving cloth is returned to its normal position, and the weft that was inserted just before weaving is stopped is removed from the weaving cloth.The removed weft is replaced with a new weft that is longer than the weft insertion length during weaving. One weft was inserted by the jetting action, and the furthest position of the new weft was made farther than the furthest position of the weft during weaving.

[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. This weft is removed and a new weft is added.
After inserting the main weft, 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. By using weft yarns longer than the length during weaving during weft insertion to prevent the occurrence of twill pillows, it is possible to secure the necessary weft insertion length while bringing the untwisted tips of the weft yarns out of the weaving width area. , it is possible to prevent one-shot weft insertion errors due to thread breakage.

[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 13. 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
(N=3 in this embodiment), the electromagnetic solenoid 26
The locking pin 26a engages with the thread 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 solenoid valve V1 is connected to a pressurized air supply tank 28, and the solenoid valves V2 to V4 are connected to another pressurized air supply tank 29. The solenoid valve V5 is further connected to a further pressurized air supply tank 30. The excitation/demagnetization control of each electromagnetic valve V1, Vi (i=2 to 5) is performed by a command from an auxiliary control computer C2.

The auxiliary control computer C2 controls the excitation and demagnetization of the electromagnetic valves V1 and Vi based on the machine rotation angle detection information obtained from the main control computer C0. The excitation/demagnetization control of the solenoid valves V1 and Vi is performed by the solenoid valve V1.
Data for this relay excitation/demagnetization control is sent to the main control computer C via the input device 31.
0 is input.

The main nozzle 20 for weft insertion has a breeze pipe 3.
3 is connected, and a check valve 34 is interposed on the breeze pipe 33. Low-pressure air is constantly supplied to the breeze pipe 33, and the main nozzle for weft insertion 20 makes a slight injection at times other than 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.

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 processing is controlled by the main control computer C0.

The flowcharts in FIGS. 9 to 13 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.

The twilling prevention control will be explained below based on the flowcharts shown in FIGS. 9 to 13. 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 and C2.

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 2 to
6a is separated from the thread winding surface 19a, and the weft can be pulled out and unwound from the thread winding surface 19a.

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. Curve G in FIG. 8 represents the weft unwinding detection signal. Weft unwinding detector 27
When the detected weft unwinding number n reaches the set number (N+1), the auxiliary control computer C1 demagnetizes the electromagnetic solenoid 26. This demagnetization causes the locking pin 26a to move to the bobbin winding surface 1.
9a and prevents the weft from being pulled out and unwound.

The position Tw1 in FIG. 5 is the position where the tip end of the weft Y during weaving is reached when the detected number n of weft yarn releases is the set number N. At position Tw2, the detected weft release number n is the set number (N+
In the case of 1), this is the position at which the tip of the weft Y2 reaches during one-shot weft insertion. Further, the installation position of the weft yarn detector 25 approximately corresponds to the waste edge cutting position, and this installation position corresponds to the end of the weaving width area. . Therefore, the interval L between both positions Tw1 and Tw2 is equal to one turn of the weft on the thread winding surface 19a, and the weft Y
The tip of 2 goes outside the weaving width area.

Even when the loom is stopped, the main nozzle for weft insertion 20 is injecting a small amount of air by supplying pressurized air from the breeze pipe 33, and the tip of the weft yarn Y2 is ejected by the main nozzle for weft insertion 20 even when the loom is stopped. exposed to spray. 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 performing one-shot weft insertion, there is a risk that the tip of the weft Y2 may be blown off within the main weft insertion nozzle 20. Alternatively, the shock caused by the locking pin 26a preventing the pulling out of the weft yarn Y2 at the end of weft insertion causes the weft yarn Y2 to be pulled out.
There is a risk that the untwisted tip of No. 2 may be blown off. When the length of the weft yarn Y2 is the length at the time of weaving, if the untwisted tip of the weft yarn Y2 is blown off, a one-shot weft insertion error occurs in which the tip of the weft yarn Y2 does not reach the end of the weaving width area.
If the loom operation is restarted, weaving scratches will occur.

However, the length of the weft Y2 is longer than the length of the weft Y during weaving by L, and the thread winding surface 1
The length L for one turn of the weft on 9a is the main nozzle for weft insertion 2.
It is longer than the untwisted length in 0. Therefore, the tip of the weft yarn Y2 after being blown out reaches the installation position of the weft yarn detector 25, and the untwisted tip of the weft yarn Y2 comes out of the weaving width area. That is, even if the untwisted tip of the weft yarn Y2 is blown off, the tip of the weft yarn Y2 reaches the end of the weaving width region, and no weft insertion error occurs.

[0032] 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 untwisted tip of the weft yarn Y2 that has reached the end of weft insertion is exposed to the spraying action of the weft insertion auxiliary nozzle group 24 for a relatively long time, and even after weft insertion is completed, the untwisted tip of the weft yarn Y2 remains untwisted. Blown out easily occurs. However, since the untwisted tip of the weft Y2 is outside the weaving width area, even if a break occurs, it does not result in a one-shot weft insertion error.

The detection timing of the weft yarn detector 25 is set in accordance with the expected arrival timing of the weft yarn inserted in one shot, and the cut piece blown out in the main weft insertion nozzle 20 is detected by the weft yarn detector 25. will not be detected by. When the weft yarn Y2 inserted in one shot is detected by the weft yarn detector 25, the main control computer C0 moves the machine motor M, the feed motor 1, and the take-up motor 18 according to the curve D7 in FIG. 8, based on this detection information.
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.
Output to. The auxiliary control computer C1 shifts to weaving excitation/demagnetization control of the electromagnetic solenoid 26 in response to the reference signal S4.

The auxiliary control computer C2 receives the reference signal S.
In response to the input of 4, the solenoid valve V5 is demagnetized, and the weaving relay excitation/demagnetization control of the solenoid valves V1 to V5 is performed. Then, the main control computer C0 controls the machine motor M as shown by curves D10, D11, and D12 in FIG.
, the feed motor 1 and the take-up motor 18 are synchronized and start rotating normally, and weaving is restarted.

FIGS. 14 to 19 show an embodiment of the second invention, and the flowcharts in FIGS. 16 to 19 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 and C2 are the same as in the previous embodiment, but the control function of the main control computer C0 is different from that of the previous embodiment.

[0041] When a weft insertion error occurs, each motor M, 1
, 18 stop synchronously as shown by curves D1, D2, and D3 in FIG. 15, and the modified reed 6 stops immediately 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.

[0042] Feeding motor 1 and take-up motor 18
After a predetermined amount of slow forward rotation, the machine motor M moves to curve D in Fig.
As shown in 6, 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. 14 to the most retracted position shown by the chain line, and the warp threads T form the maximum opening. By forming this opening, the Orimae W
1 The upper error yarn Y1 is released from the gripping action of the warp threads T, and weft insertion error processing becomes possible. 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. 14 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.

[0045] The present invention not only prevents the occurrence of cylindrical pillows, but also
The present invention can also be applied to one-shot weft insertion for avoiding weft insertion troubles at the time of restart, as disclosed in Japanese Patent No. 8-197350. Furthermore, the present invention can also be applied to a jet loom using an air pool type weft length measurement and storage device.

[0046]

Effects of the Invention As described in detail above, the first invention is characterized in that, before the start of weaving, a new weft yarn longer than the weft insertion length during weaving is inserted.
Since the weft is inserted by the jetting action and the farthest reaching position of this weft is made farther than the farthest reaching position of the weft during weaving,
When restarting after the weft removal process, the reed will no longer pass through the weaving area, and even if the tip of the weft yarn inserted in one shot is blown out, the tip of the weft yarn will be at the end of the weaving width area. This has the effect of preventing one-shot weft insertion errors caused by blow-out.

[0047] In the second invention, the front is moved from the normal position to the woven fabric side in advance before the machine slow reverses to remove the weft inserted from the front immediately before stopping weaving. ,
Since the weaving cloth is returned to its normal position after the machine slow reversal, it is possible to reliably prevent the occurrence of slight twill piles caused by hitting a mistake yarn during the machine slow reverse to remove the weft. It has a great effect.

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

FIG. 15 is a graph showing excitation/demagnetization control for one-shot weft insertion.

FIG. 16 is a flowchart showing a weft insertion processing program and a one-shot weft insertion control program according to the second invention.

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.

[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...Auxiliary control computer.

Claims (2)

[Claims] [Claim 1] In a jet loom that inserts weft yarns by the jet action of a main nozzle for weft insertion and an auxiliary nozzle for weft insertion, one weft longer than the weft insertion length during weaving is inserted by the jet action before the start of weaving operation. A one-shot weft insertion method in a jet loom in which the farthest position of the weft is farther than the farthest position of the weft during weaving. [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 slow reverses, the weaving front is returned to its normal position, and the weft inserted just before weaving is stopped is removed from the weaving front. A jet loom in which one new weft longer than the weft insertion length during weaving is inserted in place of the weft by the jetting action, and the farthest reaching position of the new weft is farther than the farthest reaching position of the weft during weaving. One shot weft insertion method.