JPS60224840A - Prevention of weaving step generation in loom - 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 Technical Field The present invention relates to a method for preventing the occurrence of weaving steps in a ram.

BACKGROUND TECHNOLOGY In general, the warp feeding device of a loom is equipped with a transmission that adjusts the amount of warp fed out by 11 m based on fluctuations in warp tension, and maintains the tension of the warp fed from the warp beam within an appropriate tolerance range. In order to achieve this, the warp tension is detected by a tension roller that is displaced according to warp tension fluctuations, and when the tension exceeds an allowable range, the transmission is shifted in the direction of increasing the warp delivery speed of the warp beam. On the other hand, when the tension of the warp threads becomes smaller than a permissible range, the speed ratio is adjusted in the direction of decreasing the delivery speed of the warp beam. Therefore, during normal operation of the loom, the tension of the warp threads is automatically corrected by the warp delivery device as described above, and a woven fabric with a uniformly dense weave is woven.

However, when the loom is stopped and restarted, the beating strength is the same as normal due to the start-up characteristics of the loom.
Unlike during the m operation, this is not sufficient and a thin film is generated on the woven fabric. Therefore, conventionally, when restarting the loom after stopping Ill operation, a load is applied to the warp threads, and the loom is restarted with the warp thread tension temporarily increased to prevent the occurrence of loom steps due to the stoppage of the loom. Methods are being used to prevent this.

However, something like this from Oridan! 1. In the prevention method, the warp tension was uniformly increased when the loom was restarted, regardless of the reason for stopping the loom, so if the loom was restarted after being stopped, the effect of preventing weaving steps could be obtained. However, if the loom is stopped due to a weft insertion error, the loom is reversed to remove the incorrect thread, and then the loom is restarted, the above will occur. In some cases, it was not possible to obtain the effect of preventing the occurrence of weaving steps.

According to the results of various experiments conducted by the inventor of the present invention, the reasons for not being able to obtain the above-mentioned effect of preventing the occurrence of weaving rows are the shedding movement when reversing the machine table to remove misplaced yarns, warp thread tension, fabric density, or weaving. It has been discovered that the fabric structure near the front of the weaving loosens due to the relationship between the fabric structure immediately after the weaving, and the #l front moves to the rear of the loom from its original position.

This phenomenon of weaving steps is particularly noticeable in dense fabrics.

Purpose The present invention has been made in consideration of the above-mentioned problems, and its purpose is to improve the weaving stage when restarting the machine after the machine has been reversed due to a weft insertion error or a weft supply error. The objective is to provide a method to prevent the occurrence of

Structure In order to achieve the above-mentioned object, in the present invention, an electromagnetic clutch is interposed in the drive path of the woven fabric winding device, and the above-described operation is carried out for a predetermined period of time during a machine reversal period after the machine is stopped due to a weft insertion error or a weft supply error. By releasing the operational connection of the 1tli clutch and stopping the unwinding of the woven fabric, the warp tension is balanced on the warp sending side and the woven fabric winding side,
Orimae will now be in the correct position when restarting Kikyaku Shun.

EXAMPLE Below, an example in which the present invention is embodied in a fluid injection type S machine will be explained based on the drawings.
After being guided to the opening system 4 side through the opening system 4 and woven into the woven fabric W in the same opening system 4, After being slidably guided by a wrinkle-removal guide member 8, it is wound up on a winding shaft 9 which is operatively connected to a machine drive motor M.

The tension roller 3 is rotatably supported at one end of a tension lever 11 that can reciprocate around a shaft 10, and a balance weight 12 suspended from the other end of the tension lever 11 allows the tension roller 3 to move the warp. T
The light yarn r is pressed against the light yarn r, and a predetermined tension is applied to the light yarn r.

Therefore, the tension roller 3 is vertically displaced according to the tension fluctuation of the warp threads T, and this vertical movement is caused by the tension lever 11
and a speed change lever 1 of a speed change 11114 that constitutes a warp feeding device via a link 13 connected to the same lever 11.
4a.

The transmission 14 includes an input pulley 14b and an output gear 14c.
are provided, and the rotational driving force of the machine drive motor M is applied to the crankshaft 15, a pulley 17 fixed to the shaft 16, a pulley 18 operably connected to the pulley 17, and a shaft 19 to which the pulley 18 is fixed. It is transmitted to the input pulley 14b of the speed change 11114 via the pulley 20 also fixed on the top.

The transmission 14 always changes the direction of rotation on the input side into one direction on the output side, that is, the direction in which the warp threads T are sent out from the warp arm 1. Accordingly, the output gear 14c of the transmission 14 and the warp beam shaft 1
A reversing mechanism 21 is provided between the a and the a. That is, a pair of opposing bevel gears 26a are attached to the bevel gear 24 provided at one end of the shaft 23 of the gear 22 that meshes with the output gear 14C, and are mounted so as to be non-rotatable with respect to the shaft 25 and slidable in the circumferential direction. , 26b can be engaged with each other, and the switching lever 29, which is urged to rotate around the shaft 28 by a spring 27, is switched in accordance with the excitation and demagnetization of the M magnetic solenoid 30. During normal operation and when the loom is stopped, the bevel gear 26a meshes with the bevel gear 24, and the rotation of the output gear 140 is transmitted to the gear 22, the bevel gear 24.26a, the worm 31 provided at one end of the shaft 25, and the worm gear. 32 and a gear 34 numbered at the other end of a shaft 33 to which the gear 32 is fixed, the signal is transmitted to the warp beam gear 1b, and the warp beam shaft 18 is rotated in the direction in which the warp threads T are sent out. And electromagnetic solenoid 3
0 is excited, the switching lever 29 is rotated counterclockwise about the shaft 28 against the spring 27, and the bevel gear 26b meshes with the bevel gear 24 as shown in FIG. The rotation of 14C is converted to the opposite direction and transmitted to the warp beam axis 1a, and the rotation of the warp beam axis 1a is
is rotated in a direction to pull back the warp threads T.

On the other hand, the winding shaft 9 has its driving horn connected to the surface roller 6 by means of an operation coupling means (not shown), and the surface roller is connected to a gear 3 fixed to one end of the roller shaft 6a.
5. Rotatably supported on the shaft 36 and actuated on the crankshaft 15 through a gear 37 meshed with the gear lν 35, a pulley 38 fixed on the shaft 36, and a pulley 39 operably connected to the pulley 38. connected. Therefore, the surface roller 6 and the winding shaft 9 are
is designed to be reversed.

Note that the operational connection means between the surface roller 6 and the winding shaft 9 is Il! It is equipped with a pressure-rubbing mechanism so that the rotation of the winding shaft 9 decreases as the winding diameter of the woven fabric W increases.

In this embodiment, an electromagnetic clutch 40 is mounted on the shaft 36.

The clamp body 40a is slidable in the direction of the shaft 36 and supported coaxially and unrotatably. A clutch portion 37a of a gear 37 rotatably supported by a shaft 36 is normally pressed by a spring 40b, and when the shaft 36 is rotated,
It also rotates. And solenoid 40
When c is excited, the clutch body 40 as shown in FIG.
a is separated from the clutch portion 37a against the action of the spring 40b, so that the rotation of the shaft 36 is not transmitted to the gear 37. Solenoid 40c is O of machine reverse operation button B.
It is designed to be excited by a command from the control device C based on the N operation. The control device C sends an excitation command to the solenoid 40c only in the range of the machine rotation angle set based on the month based on the detection from the machine rotation angle detection device M41 (for example, a known rotary encoder is used). In addition, the ffi magnetic solenoid 30 is activated based on the ON operation of the machine reverse operation button B.
It is designed to send magnetic commands.

In this embodiment, the machine rotation angle when the machine stops is θ, and the excitation command from the control device C to the solenoid 40c based on the ON operation of the machine reverse operation button B is [θ1. θ]
The rotation is performed within the machine rotation angle range of (θ1<θ), and the operation of this embodiment will be described below based on this condition.

Now, when the loom is in normal operating condition and is not shown in Figure 4, J:
A large number of weft guide members 43 arranged in parallel on the sea urchin slay 42
A weft is ejected from a main nozzle (not shown) into the weft guide hole 43a, and is driven into the facing W1 of the woven fabric W by the reed 44. While the weft yarns are being inserted normally, the loom continues to operate, the warp yarns T are sequentially sent out from the warp beam 1, and the woven fabric W is wound onto the winding shaft 9. In this state, the tension of the warp threads T fluctuates due to various causes,
This warp tension fluctuation is extracted as a downward displacement of the tension roller 3, and the same collision (Q) is transmitted to the speed change lever 14a.In other words, the gear ratio of the transmission 14 is automatically adjusted according to the warp tension fluctuation. When the warp tension becomes larger than the allowable range, the warp delivery speed of the warp beam 1 is increased, and on the other hand, when the warp tension becomes small, the warp delivery speed of the warp beam 1 is decreased.

Therefore, the warp tension is always maintained at an appropriate level, and the woven fabric W
No weaving steps occur.

When a weft insertion error occurs, the control device c sends a stop command to the drive motor M based on a weft insertion error detection signal from the light projection/reception type weft detection device η (not shown) provided on the slay 42, and the machine Driving is increased by PP and +1. At this time,
As shown in FIG. 5(a), the misplaced yarn Y2 is woven into the woven fabric W, and then the machine spindle rotates approximately once based on inertia, and the weft yarn Y3 following the misplaced yarn Y2 is beaten. The machine base stops at the rotation angle θ in the state before f, and the Orimae w1
That is, the misplaced yarn Y2 moves to the heating point P of the reed 44. Therefore, when the machine reverse rotation operation button B is pressed to remove the misplaced thread Y2, an excitation command is sent from the control device C to the solenoid 40c of the electromagnetic clutch 40 and the electromagnetic solenoid 30, and the drive motor M is activated to perform reverse rotation. Commands are sent.

Therefore, the machine is reversed with the electromagnetic clutch 40 disengaged and the reversing mechanism 21 switched to the reverse direction. When the machine is reversed, the machine rotates approximately half a turn and the warp thread T1. When T2 reaches its maximum opening state, the weft yarn Y3 inserted following the misplaced yarn Y2 is first pulled out, and then the machine is reversed almost once to open the warp yarn 71 as shown in FIG. 5(b). .1'2 is in the maximum opening state again, that is, when the reed 44 is at the position indicated by the solid line as shown in FIG.
remove from After removing the misplaced thread Y2, turn on the machine reverse operation button to reverse the machine approximately half a turn and stop at the machine base rotation angle θ.

When the machine rotation angle shifts from θ to θ1 during machine reverse rotation, which is performed after the machine stops due to the occurrence of the weft insertion error, the angle detection signal from the machine rotation angle detection device 41 causes the 1III C stops the excitation command to the solenoid 40c of the electromagnetic clutch 40, and the clutch deactivation 40a reaches the gear X.
The electromagnetic clutch 40 is again pressed against the clutch portion 37a of the electromagnetic clutch 40, and the operative connection in the electromagnetic clutch 40 is restored. Therefore, from the machine rotation angle θ to the machine rotation angle θ1, the warp beam axis 1a is reversed and the warp threads T are pulled back, but the leaf goss roller 6 and the winding shaft 9 remain in a stopped state without being reversed. Compared to when the warp beam axis 1a and the winding axis 9 are reversed at the same time, the retreat m of the weave w1 is reduced and the tension of the warp threads T is increased.

When the machine rotation angle reaches 61, the control device C stops the excitation command to the solenoid 40c of the electromagnetic clutch 4o based on the detection signal from the machine rotation angle detection device 141 as described above, and the operational connection of the electromagnetic clutch 4o is restored. Then, the reverse rotation of the surface roller 6 and the winding shaft 9 is started. Therefore, the warp beam axis 1a and the take-up axis 9 are reversed at the same time, and the textile cloth W1 moves backward. Therefore, the reversal m of the entire silk fabric and warp is suppressed by appropriately setting the activation/decoupling time of the electromagnetic clutch 19 depending on the type of woven fabric. When the machine is rotated in reverse and stopped by two rotations, the weft yarn Y1, which is woven just before the missed yarn Y2, is at the optimum position when restarting, as shown in Figure 5 (C). Since the beating point P can be adjusted to a certain value, weaving steps will not occur when the machine is restarted.

This effect of preventing the occurrence of weaving steps is achieved by disengaging the electromagnetic clutch 40 during a predetermined machine rotation angle range when the machine frame is reversed, stopping the reverse rotation of the surface roller 6 and the winding shaft 9, and rotating the warp beam axis. This is obtained by reversing only 1a, and the tension balance is performed based on the stop of unwinding of the woven fabric W and the warp pulling back on the warp beam 1 side, and the woven fabric as described in the prior art is This is because the cloth front is prevented from returning too much due to loosening of the cloth near the front U, and the cloth sleeve is adjusted to the optimum handling point P at the time of restart.

When the weft insertion error occurred, the machine reversed itself twice, but the weft broke in the main nozzle (not shown), and the broken 1i weft was detected by the weft detection device, resulting in normal weft insertion. On the other hand, if Ishitoshi's weft injection is performed and a weft feeding error occurs, the machine needs to be reversed three times. This is because, after the cut weft yarn is woven into the woven fabric, the machine base rotates approximately twice in conjunction with the weft supply operation. Even in the case of reverse rotation of the machine base, the electromagnetic clutch 40 is decoupled to compensate for the excessive return of the woven fabric W1 due to the reverse rotation of the machine frame.
is adjusted to the optimal beating point P upon restart.

Note that the present invention is not limited to the above embodiments,
For example, instead of starting to release the electromagnetic clutch 40 at the same time as the start of reverse rotation of the machine, it may be done during the reverse rotation of the machine. Further, the timing for returning the electromagnetic clutch 40 to the operative connection may be set using a timer. Furthermore, the electromagnetic clutch may be provided at an appropriate position in the drive path of the take-up device other than the 8 landing positions in the above embodiment, or the machine reverse rotation may be performed by hand, and the N The magnetic latch may also be decoupled.

Further, it is also possible to embody the present invention in a loom using a transmission that directly transmits forward and reverse rotation of the loom to the warp beam side.

Effects As detailed above, in the method for preventing the occurrence of weaving steps of the present invention, the weaving front position is adjusted to a predetermined position after the machine table is reversed due to a weft insertion error or weft supply error. This has an excellent effect of preventing the occurrence of weaving steps at the time of restart.

[Brief explanation of drawings]

The drawings show an embodiment embodying the present invention; FIG. 1 is a schematic side view of a loom, FIG. 2 is a partially cutaway plan view of essential parts showing the operating and connected state of the electromagnetic clutch, and FIG. Fig. 4 is a partially broken plan view of the main parts showing the state in which the electromagnetic clutch is released from the operational connection; Fig. 4 is a side view showing the vicinity of the warp opening;
b) and (c) are both side views showing the vicinity of the front of the woven fabric. Surface roller 6, take-up shaft 9, electromagnetic clamp 40, Orimae W1゜Patent applicant: Toyota Industries Co., Ltd., Ori II Seisakusho representative
Person Patent Attorney On 1) Hironobu

Claims (1)

[Claims] 1.11 An electromagnetic clutch is interposed in the drive path of the cloth winding device, and the electromagnetic clutch is decoupled for a predetermined period of time during the machine reversal period after the machine stops due to a weft insertion error or weft supply error, etc. A method for preventing the occurrence of weaving steps in $111a, characterized by stopping unwinding of the cloth.