JPS61167047A - Weft yarn feed preparatory method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a weft supply preparation method in a jet loom such as an air jet loom or a water jet loom. More specifically, the present invention relates to a method for preparing weft yarns for supply in a drum pool type jet loom, in which weft yarns unwound from weft cheese are stored on a weft sub-length drum and inserted by a jet nozzle.

The weft sub-length drum of the present invention may be of the type in which the drum rotates and the weft is wound or stored on its circumference, or the drum is stationary and the weft winding tube (winding arm) rotates around it. Any type of material may be used in which the weft is wound and stored.

[Conventional technology]

The drum pool type weft storage device must rotate in complete synchronization with the crankshaft of the loom body, and cannot rotate in reverse. If synchronization with the crankshaft is not achieved, a predetermined length of weft yarn cannot be inserted at a predetermined timing, resulting in a weft insertion error. Furthermore, if the drum or the like is rotated in the opposite direction, the wound weft yarns will be disturbed and weft insertion will not be possible.

A loom may stop operating due to yarn breakage or other causes. In such a case, restart the machine after removing the cause of the stoppage. Even in that case, the drum pool type weft storage device is $I! for the reasons mentioned above. ! 1!
It must rotate in complete synchronization with the main body's crankshaft, and it cannot rotate in the opposite direction.

[I8I problem to be solved by the invention] JP-A-59-1
Publication No. 25943 discloses that when a loom stops operating due to thread breakage or other causes, the weft is wound around a drum-type weft pool device, and the weft necessary for one-pick weft insertion is almost automatically stored. A method is disclosed in which the method can be performed.

In this method, when a weaving abnormality occurs, the machine is stopped (crank angle at knee approximately 300 degrees), and the weft length measuring drum drive system and 11
The connection with the crankshaft of the machine is cut off, and the drive system of the weft length measuring drum can be driven by an auxiliary motor.
The crank angle is
The machine is reversed so that the angle matches the above-mentioned crank angle, the auxiliary motor sets the weft length measuring drum to the appropriate position, the weft end is hooked to the weft length measuring drum in the appropriate position, and then The auxiliary motor rotates the weft length measuring drum in a predetermined manner to store a predetermined amount of weft on the weft length measuring drum.

In order to perform the above weft preparation method reliably, it is necessary to match the crank angle when the machine is stopped with the crank angle of the machine before storing the weft in the weft measuring drum, and It is necessary to match the timing of each part of the drum.

However, in reality, it is very difficult to stop the loom by making the crank angle after reversing the loom match the crank angle when the loom stops, and if you try to force the loom to match, the machine will break down. It becomes very complex and equipment costs are high.

Therefore, the amount of rotation of the drum by the auxiliary motor is adjusted depending on the relationship between the crank angle (2) after the loom is reversed and the crank angle when the loom is stopped. In other words, if ■the crank angle after reverse rotation of the machine is behind the crank angle when saIm is stopped, the difference between the two angles, I[
- Rotate the weft and thread length measuring drums by an angle of I. If the crank angle after reversing the loom is ahead of the crank angle when the loom is stopped at 1, the weft and thread length measuring drums will only move in the forward direction. Since rotation is not possible, the weft length measuring drum is rotated by an angle close to one rotation of the machine, and one pick worth of weft stored in the weft length measuring drum before rotation is removed.

As mentioned above, it is very difficult to match the crank angle ■ after the machine is reversed with the crank angle ■ when the m machine is stopped, and if you try to force it to match, the equipment will become very complicated and the equipment will be damaged. Expenses will be high.

In addition, in order to control the rotation of the weft length measuring drum according to the relationship between the crank angle ■ after reversing the machine and the crank angle work when the 111 machine is stopped, the rotation of the weft sub-length drum is controlled according to the stop position. Controlling the amount is complicated. Moreover, in addition to weft insertion errors, there are other abnormalities during weaving, such as feeding errors in which the weft is not fed to the main nozzle, warp thread breakage, and selvedge thread breakage, and different measures should be taken depending on these abnormalities. Operators may make operational errors, resulting in longer operation times and insufficient quality of the resulting woven fabric.

[Purpose of the invention]

The present invention solves the problems associated with the above-mentioned prior art, eliminates the need to delicately adjust the stopping positions of the 11 aircraft, eliminates the need for complex and expensive devices for controlling the stopping positions, and A weft supply system that can handle weft supply errors or weft insertion errors with the same operation, eliminates operator errors, allows for weaving of high-quality fabrics, and shortens the processing time for abnormal stoppages. The purpose is to provide a preparation method.

[Means for solving problems]

In the present invention, the above-mentioned purpose is achieved by using a clutch to disconnect the drive system of the weft length measuring drum from the crankshaft of the loom when the loom is stopped, and while the crankshaft rotates the loom in reverse, the auxiliary motor drives the weft length measuring drum. In the weft supply preparation method in which a predetermined amount of weft is stored on the weft length measuring drum by driving the drive system, the drive system of the weft length measuring drum is rotated in the forward direction by an auxiliary motor between the time when the machine is stopped and the time when the machine is restarted. This is accomplished by a weft supply preparation method in which at least one pick worth of weft yarn stored in the weft sub-length drum is removed and the loom is restarted.

[Effect]

In the present invention, regardless of the relationship between the crank angle ■ after reversing the loom and the crank angle when the loom is stopped,
In other words, regardless of whether the crank angle ■ after reversing the loom is behind or ahead of the crank angle when the loom is stopped, the weft length measuring drum drive system must be adjusted to at least 1 loom. This is done by rotating the drum by the angle of the rotation and removing one pick worth of weft that was stored in the drum before rotation.As with the conventional technology, the stopping position of the Is machine can be slightly tilted.
There is no need to unload the vehicle, and a complicated and expensive device for controlling the stop position can be eliminated.

Further, according to the present invention, if there is a weft supply error, especially when the weft is wrapped around the weft length measuring drum, the wrapped weft is cut and removed, and the weft is transferred from the winding arm of the length measuring drum to the gripper. Pass it through the main nozzle, guide it to a removal means such as a suction means at the main nozzle outlet, and turn on the start button.The drive system of the weft length measuring drum will rotate and one pick worth of weft yarn will be stored on the length measuring drum. Even when there is a weft supply error, it can be handled using the same operations as when there is a weft insertion error.
The operation of winding one pick's worth of weft yarn around the drum is no longer necessary, eliminating operational errors by one worker, making it possible to weave a fabric of good quality, and shortening the abnormal processing time when an abnormal stop occurs.

〔Example〕 Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic plan view of an air jet room in which the present invention is implemented, and the crankshaft of #1 machine is driven by a belt from a main motor. In addition, the crankshaft is the clutch member 1
4.15 and a drive belt 27 to the winding arm 28a of the weft length measuring drum 28. B
The bins 29 and A bins 30 move in and out of the circumferential surface of the weft length measuring drum 28 in synchronization with the rotation of the crankshaft, and wind the weft yarn unwound from the weft cheese 32 through the tensor onto the weft length measuring drum 28. Installation and main air jet nozzle 4
III In the drawer to 9.

The clutch member 14 is integrally connected to a drive shaft 19 connected to a crankshaft. On the other hand, the clutch member 15 is spline-coupled to the driven wheel 20. Further, the sleeve 16 is installed on the driven wheel 20 so that it can rotate relative to it and move in the axial direction. Therefore, the clutch member 15 is connected to the sleeve 16.
In contrast, they move integrally in the axial direction, but can rotate relative to each other. Note that, as shown in the figure, the clutch members 14 and 15 are formed with engagement protrusions and recesses at positions eccentric from the axes of the drive shaft 19 and driven shaft 20, so that the clutch members are not engaged until the phases of the protrusions and the recesses match. 14.15 engages.

A compression spring 18 is installed between the boss 17 fixed to the driven wheel 20 and the left end of the sleeve 16, and the clutch member 1
5 is always urged rightward, that is, toward the clutch member 14 side. A l1lI wheel 34 is integrally attached to the end of the driven shaft 20. Gear 34 is engaged with gear 35,
The m wheel 35 is connected to an auxiliary motor 36 via an electromagnetic clutch 33.
It is connected to the output shaft of.

A lever 21 is swingably supported by a bin 22 provided on the machine base, and its tip is engaged with the sleeve 16. The other end of the lever 22 is connected to a screw rod of an air cylinder 23 by a pin 24.

When the switching valve is operated to extend the piston rod of the air cylinder 23, the lever 21 rotates counterclockwise to disengage the clutch member 14, 15 against the force of the compression spring 18.

If the electromagnetic clutch 33 is connected in this state, the rotation of the auxiliary motor 36 is transmitted to the winding arm 28a of the weft measuring drum 28 via the gears 34, 35 and the drive belt 27.
transmitted to. On the other hand, when the piston rod of the air cylinder 23 is moved back, the clutch member 14.15 is engaged by the spring force of the compression spring 18, and the rotation of the main motor is transmitted to the winding arm 28a of the weft measuring drum via the drive belt 27. Ru.

Note that the limit switch 26 is actuated by the lever 21 and detects engagement of the clutch members 14, 15.

Reference numeral 71 is a yarn guide, and 72 is a gripper, which includes a cam 11 that rotates in time with the crankshaft, and a fulcrum 13.
It is opened and closed by a lever 12 that swings around the lever 12 and a cam follower 10 supported by the lever 12. The feeler 3 detects that the weft yarn is being supplied to the main air jet nozzle 49.

The main air jet nozzle 49 injects compressed air in synchronization with the movement of the crankshaft and inserts the weft yarn into a shed formed between the light yarns. The fillers 51 and 52 detect insertion of the weft yarn, and the reed 25 beats the inserted weft yarn.

Moreover, between the main air jet nozzle 49 and the selvage thread,
Ejector type suction nozzle 61 as a suction member
has been established. A shutter 63 is rotatably supported, and a suitable reciprocating member 62 such as an air cylinder or an electromagnetic solenoid is connected to the rotation shaft of the shutter 63.

By actuation of the reciprocating member □62, the shutter 63 can be moved between a position outside the weft path ejected from the main air jet nozzle 49 and a position on the weft path.

The air 70-nozzle 64 faces the suction nozzle 61 across the weft insertion path, and injects an air flow toward the suction nozzle 61 to blow the weft blocked by the shutter 63 into the suction nozzle 61 and suction it. .

The action will be explained below.

During steady operation> The main motor drives the crankshaft to cause the heald frame to move in an opening motion, and the weft is inserted into the shed formed between the upper and lower warps.

That is, in FIG. 1, the weft yarn unwound from the weft cheese 32 via the tensor is measured by the winding arm 28a of the weft length measuring drum 28 which rotates from the crankshaft via the clutch member 14.15 and the drive belt 27. After being wound around the drum 28 and having its length measured, it passes through the gripper 72 and reaches the main air jet nozzle 49.

The operation of the gripper 72 and the main air jet nozzle 49 is controlled in synchronization with the rotation of the crankshaft, and compressed air injected from the main air jet nozzle 49 moves the weft stored on the weft length measuring drum 28 up and down. The weft is inserted into the shed formed between the warp threads.

Next, an embodiment of the weft supply preparation method at the time of abnormal stop of the present invention will be described.

<When weft insertion error> (Refer to the second row from the right in Fig. 2) The detectors 51 and 52 installed near the selvage threads on the opposite side of the main air jet nozzle 49 detect when the warp threads are almost closed (at the crank angle). α-250~300rlL> Check the weft insertion condition, and if for some reason the weft inserted into the shed does not reach the selvage yarn on the opposite side of the main air jet nozzle 49, or a weft insertion error occurs, the detector 51 and 52 issue a weft insertion error signal (crank angle αO in Fig. 3).

The main motor stop signal based on this weft insertion error signal stops the operation of the motor that drives the machine base, and enters inertial operation (crank angle α1 in FIG. 3).

Also, when a weft insertion error signal is sent, the reciprocating member 6
The second piston moves forward to cause the shutter 63 to cross the weft path, and compressed air is injected from the air blow nozzle 64. In this way, the weft yarn ejected from the main air jet nozzle 49 after a weft insertion error is blocked by the shutter 63, guided by the air jetted from the air blow nozzle 64, reaches the suction nozzle 61, and is sucked into the suction nozzle 61. Ru.

After the machine, which was operating inertia, moves for about one cycle, it stops with the warp almost closed (crank angle α2 - about 300 degrees), and a machine stop signal is sent.

When the machine stops, the operator turns on the reverse button. As a result, the air cylinder 23 operates, and the clutch member 1
4.15 is disengaged so that the rotation of the crankshaft is not transmitted to the winding arm 28a of the length measuring drum, while the electromagnetic clutch 33 is connected. In this state, the machine is reversed (crank angle α3 in Figure 3). When the machine starts reverse rotation, the air cylinder 23 is turned off, and the spring 18 moves the clutch member 1 toward the clutch member 14.
5 is pressed, but since the two clutch members 14 and 15 are out of phase, they do not engage, and the rotation of the crankshaft is not transmitted to the winding arm 28a of the length measuring drum 28.

In order to remove the wrong weft inserted into the shed, the machine is
The rotation is reversed (about 480 degrees in crank angle), the warp is opened, and the crank angle (crank angle α4 - about 180 After the machine is reversed (from 300 degrees to 180 degrees in crank angle), the machine is stopped.

Next, the operator inspects the machine and first checks whether the weft yarn is connected from the weft cheese 32 to the suction nozzle 61 (if it is not connected, the next processing is performed as a supply error).

The worker removes the weft yarn that was inserted incorrectly, turns on the confirmation button installed to prevent fools (fool-proofing), and then turns on the start button (Fig. 3 Crank angle α
5), the driven shaft 20 and the winding arm 28a of the weft length measuring drum 28 are driven in the forward direction by the auxiliary motor 36.

When the phases of the clutch members 14, 15 match, the compression spring 18 presses the clutch members 14, 15 to engage each other, and the rotation of the auxiliary motor 36 is stopped (crank angle α6 in FIG. 3). Therefore, during this period, the winding arm 28a of the weft length measuring drum (crank angle when stopped - approximately 300 degrees) is rotated forward to an angle corresponding to the crank angle (approximately 180 degrees) of the reversed machine base (normal rotation angle is 2
40 degrees), and as the winding arm 28H rotates, the A bin 30 of the weft length measuring drum 28 is rotated as shown in FIG.
is retracted, one pick worth of weft on the length measuring drum 28 is removed, and the suction nozzle 61 removes it by suction.

Next, the weft in front of the main nozzle 49 is cut by a cutter provided near the suction nozzle 61, and then the air cylinder 23 is activated to cut the weft yarn in front of the main nozzle 49.
5 is disengaged so that the rotation of the crankshaft is not transmitted to the winding arm 288 of the length measuring drum.Meanwhile, the electromagnetic clutch 33 is connected, and in this state the machine is reversed for alignment. Figure 3 Crank angle αa). When the machine starts to rotate in reverse, the air cylinder 23 is turned off and the clutch member 15 is pressed toward the clutch member 14 by the spring 18, but since the phases of both clutch members 14 and 15 are out of alignment, they do not engage, and the crank The rotation of the shaft is not transmitted to the winding arm 28a of the weft length measuring drum 28. The machine is at the restart position (crank angle α8 = approx. 30
0 degrees) and stop.

Next, the auxiliary motor 36 drives the driven shaft 20 and the winding arm 28a of the weft length measuring drum 28 in the forward direction (from a crank angle of 180 degrees to 120 degrees of 300 degrees). When the phases of the clutch members 14.15 match, both clutch members 14.15 are engaged and the rotation of the auxiliary motor 36 is stopped.

During this time, the winding arm 28a of the weft length measuring drum 28 is rotated forward by an angle corresponding to the amount of reverse rotation of the machine table (α9 in FIG. 4), and as shown in FIG.
8 A pin 30 protrudes and two B pins retract,
The weft for one pick is stored on the sub-length drum 28.

In this state, the machine will resume operation.

(See the right side of Fig. 2) One of the causes of weft insertion errors as described above is that the weft yarn is cut between the weft cheese 32 and the main air jet nozzle 49, causing the main air jet! - The weft may not be supplied to the nozzle 49 (so-called supply error).

In this case, the weft yarn is not normally connected from the weft cheese 32 to the suction nozzle 61 when the machine is stopped. In such a case, after stopping the above-mentioned reverse rotation of the machine, between the process of removing the weft thread that was incorrectly inserted and the process of turning on the confirmation button (between crank angles α4 and α5 in Figure 3), , the weft thread is passed through the weft length measuring drum 28, and the weft thread is normally connected from the weft cheese 32 to the suction nozzle 61.

That is, the weft is pulled out from the weft cheese 32, passed through four main air jet nozzles from the circumferential surface of the weft length measuring drum 28, and the tip of the weft is sucked into the suction nozzle 61. Note that instead of suctioning the suction nozzle 61,
For example, it may be hung on the temple of the machine.

In this way, when the weft is guided from the weft cheese 32 to the suction nozzle 61 and the start button is pressed, the auxiliary motor 36 drives the driven shaft 20 and the winding arm 28a of the measuring drum in the forward direction according to the procedure described above. The machine is rotated forward to an angle corresponding to the crank angle (180 degrees) of the reversed machine (the forward rotation angle is 240 degrees), and one pick worth of weft yarn on the length measuring drum 28 is removed, and is suctioned away by the suction nozzle 61. and the clutch member 14.
15 engage with each other when the phases match, and the rotation of the auxiliary motor 936 is stopped.

Next, the cutter cuts the weft yarn in front of the main nozzle 49, and then, with the clutch members 14 and 15 disengaged, the machine is restarted for mating! ! (crank angle 300 degrees) and stops.

Furthermore, the auxiliary motor 36 drives the driven shaft 20 and the winding arm 28a of the length measuring tram in the positive direction again, so that the A bin 30 and the B bin 29 of the length measuring drum 28 emerge and retract (see FIG. 6). One pick worth of weft yarn (approximately three and a half turns of weft yarn) is stored on the length measuring drum 28.

In this state, the machine will resume operation.

<When warp threads or selvage threads break> (Refer to the second row from the left in Figure 2) If the warp threads or selvage threads break, tie the cut warp threads or selvage threads together after the machine has stopped. Turn on the confirmation button and then turn on the start button. When the warp breaks,
When the selvage thread breaks, there is no mis-inserted weft thread, so there is no need to remove the mis-inserted weft thread.In order to make the weft thread length from the tip of the main air jet nozzle 49 to a predetermined length, the crank angle at the time of stop is adjusted. (α2=approximately 300 degrees), a predetermined crank angle (α4=approximately 18
0 degrees), reverse the machine (300 degrees → 180 degrees, 120 degrees).

Following the same procedure as when turning on the start button in the case of a weft insertion error described above, the auxiliary motor 36 drives the driven shaft 20 and the winding arm 28a of the weft length measuring drum 28 in the forward direction, and the crank of the machine base is reversed. The crank angle is rotated forward to an angle corresponding to the angle (approximately 180 degrees) (the crank angle of forward rotation is approximately 240 degrees), the weft for one pick on the length measuring drum 28 is removed, and the weft yarn is removed from the suction nozzle 61.
When the phases match, the clutch members 14 and 15 engage with each other, and the rotation of the auxiliary motor 36 is stopped.

Next, the cutter cuts the weft yarn in front of the main nozzle 49, and then, with the clutch members 14 and 15 disengaged, the machine is moved to a restart position (crank angle of approximately 300 degrees) for mating. Reverse and stop.

Next, the auxiliary motor 36 drives the driven shaft 20 and the winding arm 28a of the weft length measuring drum 28 in the forward direction again, so that the A bin 30 and the 8 bin 29 of the length measuring drum 28 come out and retract, and the weft length measuring drum One pick worth of weft yarn (approximately three and a half turns of weft yarn) is stored on 28.

In this state, the machine will resume operation.

<When operating the stop button> (See the left end of Figure 2) In this case, the process is the same as the process when the warp thread breaks or the selvage thread breaks as described above, except that the warp thread or selvage thread tying process is not necessary. .

In the above explanation, the weft yarn for at least one pick stored in the weft length measuring drum is removed from the suction member (suction nozzle 61) provided at the outlet side of the main air jet nozzle between the time when the machine is stopped and the machine is restarted. However, in carrying out the present invention, the weft yarn is not limited to suction using a suction member, and may be removed by other suitable taking-off means such as a winding tool.

Furthermore, even after detecting a miss yarn, the weft yarn next to the miss yarn is gripped with a gripper or the like on the upstream side of the main air jet nozzle to prevent weft insertion by preventing it from being jetted from the main air jet nozzle. method is applicable.

Further, the operation based on the cause of the stop shown in FIG. 2 is a standard operation, and various applications are possible. - For example, if a worker performs manual operations such as repairing scratches (for example, if the warp threads are broken and the weaving stops after weaving several picks for some reason), the manual operation will result in accurate startup. It is not an easy task to match the crank angle, but according to the present invention, if you match it to the approximate starting crank angle position,
You can start it.

〔Effect of the invention〕

According to the present invention, the crank angle after reversing the machine base is
Regardless of the relationship between and the crank angle ■ when the loom stops, that is, whether the crank angle ■ after the loom reverses is behind or ahead of the crank angle I when the loom stops, Similarly, the drum is rotated by an angle equivalent to at least one rotation of the machine, and one pick worth of weft stored in the drum before rotation is removed, and the tIA machine is stopped as in the prior art. There is no need to delicately control the position, and a complicated and expensive device for controlling the stop position can be eliminated.

Further, according to the present invention, if there is a weft supply error, especially when the weft is wrapped around the weft length measuring drum, the wrapped weft is cut and removed, and the weft is transferred from the winding arm of the length measuring drum to the gripper. Pass it through the main nozzle, guide it to a removal means such as a suction means at the main nozzle outlet, and turn on the start button.The length measuring drum will rotate and the weft for one pick will be stored on the length measuring drum, which will be used in case of a weft supply error. This eliminates the need to press the drum rotation button and wrap one pick's worth of weft around the drum, eliminating operator errors and producing high-quality fabrics. Weaving is possible, and the abnormal processing time at the time of abnormal stoppage can be shortened.

Therefore, according to the present invention, it is possible to almost automatically wind the weft yarn around the weft sub-length drum, thereby reducing the labor burden on the worker, increasing labor productivity, and at the same time preventing malfunctions caused by the unskilled worker. It can be prevented.

[Brief Description of the Drawings] Fig. 1 is a plan view showing an overview of the drive system of the air jet room according to the present embodiment, Fig. 2 is a flowchart of an embodiment of the present invention, and Fig. 3 is a diagram showing the process according to the present invention. Fig. M4 is a plan view showing the procedure for storing the weft yarn on the weft measuring drum in Fig. 3; Fig. 5 is a processing operation diagram when a feeding error occurs according to the present invention; Fig. 6 is a diagram showing the processing operation when a feeding error occurs; FIG. 5 is a plan view showing the procedure for storing weft yarns on the weft sub-length drum, and FIG. 7 is a processing operation diagram when warp yarns or selvedge yarns break according to the present invention. 14.15...Clutch member, 28...Weft length measuring drum, 49...Main air jet nozzle, 51.52...
- Detector, 61... Suction nozzle, 62... Reciprocating member, 63... Shutter, 64... Air blow nozzle. 1st page of page 1 (no change in 'G') Engraving of Figure 3 drawing (i'''J '8 unchanged) 14th page'
IT) (No text in the content) Fig. 5 '7j 1i7i 1 yen (no change in content) Fig. 6] 9 Engraving of page 4 (no change in content) Fig. 7 Procedure correction teeth (method) May 29, 1985 Manabu Shiga, Commissioner of the Patent Office, 1985 Patent Application No. 006578 2, Name of the invention Weft supply preparation method 3, Person making the amendment Relationship with the case Patent applicant's office
2-1 Toyotacho, Kariya City, Aichi Prefecture 448 Address name
Name (321) Toyota Auto Co., Ltd.#
Aircraft Factory A 4, Agent 5, Date of amendment order: April 30, 1985 (shipment date) 6. Drawings subject to amendment, Figures 2 to 7, Figure 7, Details of amendment, Figures 2 to 7 Correct as shown in the attached sheet. (Please note that this amendment is to correct the explanatory characters in the drawings that were printed by a word processor to handwritten text, and there is no change in the content.) 8. List of attached documents

Claims (1)

[Scope of Claims] 1. When the loom is stopped, the clutch disconnects the drive system of the weft length measuring drum from the crankshaft of the loom, and the crankshaft rotates the loom in reverse, and the auxiliary motor drives the weft length measuring drum. In the weft supply preparation method in which a predetermined amount of weft is stored on the weft length measuring drum by driving the system, the drive system of the weft length measuring drum is rotated in the normal direction by an auxiliary motor between the time when the machine is stopped and the machine is restarted. A weft supply preparation method comprising removing at least one pick worth of weft stored in the weft length measuring drum and restarting the loom. 2. At least 1 stored in the weft length measuring drum
The weft supply preparation method according to claim 1, wherein the picked weft yarns are removed in the weft insertion direction. 3. At least 1 stored in the weft length measuring drum
3. The weft supply preparation method according to claim 2, wherein the picked weft is removed by suction by a suction member provided at the outlet of the weft insertion main nozzle. 4. The drive system of the weft length measuring drum is rotated in the forward direction to a crank angle corresponding to the reverse crank angle of the machine between the stop and restart of the machine. The weft supply preparation method according to any one of the items. 5. The engaging portion of the clutch member provided between the drive system of the weft length measuring drum and the crankshaft of the loom is eccentric from the rotation axis, and when the drive system of the weft length measuring drum rotates in the forward direction, the weft 5. The weft supply preparation method according to claim 4, wherein the drive system of the length measuring drum and the crankshaft of the loom engage only in a predetermined phase.