JPS60231849A - Prevention of weaving step 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 loom.

BACKGROUND TECHNOLOGY In general, the warp feeding device of a loom is equipped with a transmission that controls the amount of warp fed out based on warp tension fluctuations, 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 warp tension becomes smaller than the allowable range, the gear ratio of the transmission is adjusted to reduce the warp delivery speed of the warp beam.

Therefore, during normal operation of the loom, the warp tension is automatically corrected by the warp feeding device as described above, and a woven fabric of uniform density is woven.

However, when the loom is restarted after stopping its operation, the beating strength is lower than normal due to the start-up characteristics of the loom.
Unlike during 1 liter operation, this is not sufficient and a thin film is generated on the fabric. Therefore, conventionally, when restarting a loom after it has stopped operating, a load is applied to the warp threads, and the loom is restarted with the warp tension temporarily increased to prevent the occurrence of weaving steps due to the stoppage of the loom. method has been adopted.

However, in this method of preventing loom formation, the warp tension is uniformly increased when the loom is restarted, regardless of the reason for stopping the loom, so when the loom is restarted after it has been stopped, Although the effect of preventing the occurrence of weaving steps was obtained, after the loom operation was stopped due to a weft insertion error, the loom was reversed to remove the incorrect threads, and then the loom was restarted. When this was done, it was not possible to obtain the effect of preventing the formation of weaving steps as described above.

According to the results of various experiments conducted by the inventor of the present application, the reasons for not being able to obtain the above-mentioned effect of preventing the formation of weaving rows are the shedding movement during reversal of the machine to remove misplaced threads, warp thread tension, fabric density, or weaving. It has been discovered that the cause of the weaving stage is that the fabric structure near the front of the weaving loosens due to the relationship between the immediately following fabric structures, etc., and the fabric 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 solve the problem when restarting the machine after the machine has been reversed due to an error in thread insertion or weft supply. An object of the present invention is to provide a method for preventing the occurrence of weaving steps.

Structure In order to achieve the above object, the present invention includes an electromagnetic clutch in the drive path of the warp delivery device equipped with a transmission that controls the warp delivery amount based on warp tension fluctuations and in the drive path of the fabric winding device. The electromagnetic clutch is decoupled 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, etc., and the rewinding of the warp threads and the woven fabric is stopped. The amount of reversal of the warp and woven fabric was adjusted so that the front of the loom would be in the correct position when restarting after the machine was reversed.

EXAMPLE Below, an example in which the present invention is embodied in a fluid injection type loom will be explained based on FIGS. After being guided to the system 4 side and woven into the woven fabric W in the same opening system 4,
After being slidably guided by a wrinkle removing guide member 8, it is wound onto a winding shaft 10 which is operatively connected to a machine drive motor M via a crankshaft 9.

The tension roller 3 is rotatably supported at one end of a tension lever 12 that can reciprocate around a shaft 11, and a balance weight 13 suspended from the other end of the tension lever 12 allows the tension roller 3 to move the warp. T
The warp threads T are pressed against each other and a predetermined tension is applied to them.
: Sea urchins are turning.

Therefore, the tension roller 3 is displaced up and down according to the tension fluctuation of the warp threads T, and this up and down movement is caused by the tension lever 12
and a speed change lever 15a of a transmission 15 that constitutes a warp delivery device via a link 14 connected to the same lever 12.
transmitted to.

The transmission 15 has an input pulley 15b and an output gear 15c.
The rotary driving force of the machine drive motor M is applied to the crankshaft 9, a double pulley 17 fixed to the shaft 16, a pulley 18 operably connected to the pulley 17, and a shaft 19 fixed to the pulley 18. The signal is transmitted to the input pulley 15b of the transmission 15 via the pulley 20 also fixed on the top.

The transmission 15 is configured to always change the direction of rotation on the input side into the direction of rotation in one direction on the output side, that is, the direction in which the warp threads T are sent out from the warp beam 1. Accordingly, the output gear 15c of the transmission 15 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 15C, and are mounted so as to be unrotatable with respect to the shaft 25 and slidable in the coaxial direction. 26B can be engaged with each other, and the switching lever 29, which is urged to rotate about the shaft 28 by a spring 27, is switched in accordance with the excitation and demagnetization of the electromagnetic 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 15C is controlled by the gear 22, the bevel gear 24.
It is transmitted to the warp beam gear 1b via the worm gear 31, the worm gear 32, and the gear 34 provided at the other end of the shaft 33 to which the gear 32 is fixed, and the warp beam shaft 1a is rotated in the direction in which the warp threads T are sent out. And electromagnetic solenoid 30
When is excited, the switching lever 29 is rotated counterclockwise about the shaft 28 against the spring 27, and as shown in FIG. 3, the bevel gear 26B meshes with the bevel gear 24, and the output gear 15C The rotation is converted to the opposite direction and transmitted to the warp beam axis 1a, and the warp beam axis 1a is rotated in a direction to pull back the warp threads T.

On the other hand, the winding shaft 10 obtains its driving force from the surface roller 6 by means of an operation coupling means (not shown), and the surface roller is driven by a gear A7 fixed to one end of the roller shaft 6a.
35, a crankshaft 9 is rotatably supported by a shaft 36 and is engaged with the gear 35, a pulley 38 fixed on the shaft 36, and the double pulley 17 operably connected to the pulley 38. is operatively connected to. Therefore, the safety roller 6 and the winding shaft 10 are rotated in the forward and reverse directions in accordance with the forward and reverse rotation of the machine drive motor M.

Note that the operational connection means between the surface roller 6 and the winding shaft 10 is equipped with a friction welding mechanism, and as the winding diameter of the woven fabric W increases, the rotation of the winding shaft 10 decreases. There is.

In this embodiment, an electromagnetic clutch 40 is mounted on the shaft 16.

A clutch body 40a that is slidable in the direction of the shaft 16 and unrotatably supported on the same axis is attached to a clutch portion 17a of a double pulley 17 rotatably supported on the shaft 16 with a spring 40b.
The two pulleys 17 are always in pressure contact with each other, and when the shaft 16 is rotated, the double pulley 17 also rotates. and,
When the solenoid 40C is energized, the clutch body 40a resists the spring 40b and moves the clutch portion 17 as shown in FIG.
a, so that the rotation of the shaft 16 is not transmitted to the double pulley 17. The solenoid 40C is energized by a command from the control device C based on the ON operation of the machine reverse operation button B. The control device C operates the solenoid 4 only in the range of the machine rotation angle set based on the detection signal from the machine rotation angle range @41 (for example, a known rotary encoder is used).
An excitation command is sent to 0C, and an excitation command is sent to the electromagnetic solenoid 40 based on the ON operation of the machine reverse operation button B.

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

Now, when the loom is in a normal operating state, wefts are injected from a main nozzle (not shown) into the weft guide holes 43a of the weft guide members 43 arranged in parallel on the slay 42, as shown in FIG. It is driven into the fabric front W1 of the woven fabric W by the reed 44. While the weft yarns are 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 around the winding shaft 10. In this state, the tension of the warp threads T fluctuates due to various causes, but this tension fluctuation of the warp threads is extracted as a vertical displacement of the tension roller 3, and the same displacement is transmitted to the speed change lever 15a. That is, the gear ratio of the transmission 15 is automatically adjusted according to the fluctuation of the warp tension, and when the warp tension becomes larger than the allowable range, the warp delivery speed of the warp beam 1 is increased, and conversely, the warp delivery speed is increased. When the tension decreases, the warp delivery speed of the warp beam 1 is reduced. Therefore, the tension of the warp yarns is always maintained at an appropriate level, and no weaving steps occur in the woven fabric W.

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 a light projection/reception type weft detection device (not shown) provided on the slay 42, and the machine operation is stopped. will be stopped. At this time, Figure 5 (
As shown in a), the erroneous yarn Y2 is woven into the woven fabric W, and then the machine base rotates approximately once based on inertia, and the weft yarn Y3 following the erroneous yarn Y2 is just before being beaten. The machine base stops at the rotation angle θ, and the woven fabric w1, that is, the miss thread Y2, is located at 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 T
When I and T2 are in the maximum opening state, first, miss thread Y2
Next, the inserted weft yarn Y3 is pulled out, and then the machine is reversed almost once, and as shown in FIG. 4 When Wl, 44 reaches the position shown by the solid line as shown in Figure 4, the misplaced yarn Y2 is removed from the woven fabric W. After removing the misplaced yarn 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 control device C is activated by the angle detection signal from the machine rotation angle detection device 41. Solenoid 40 of electromagnetic clutch 40
The excitation command to c is stopped, the clutch body 40a is brought into pressure contact with the clutch portion 17a of the double pulley 17 again, and the operative connection in the electromagnetic clutch 40 is restored. Therefore, from the machine stop angle θ to the machine rotation angle θ1, the warp beam shaft 1a and the take-up shaft 9 are in a stopped state without being reversed, and the fabric cloth W1 is not displaced.

When the machine rotation angle reaches θ1, as described above, 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 base rotation angle detection device 41, and the operational connection of the heavy artillery clutch 4o is restored. Then, the warp beam axis 1a and the take-up axis 10 start to rotate in reverse. Therefore,
As the warp threads T are pulled back, the woven fabric W is rewound, and the woven fabric W1 is moved backward. Therefore, in order to suppress the amount of reversal of the entire woven fabric and warp yarns by appropriately setting the activation/decoupling time or the release angle of the electromagnetic clutch 40 according to the type of woven fabric, even if the phenomenon of loosening of the woven fabric occurs, the weft When the machine stopped due to an insertion error, it reversed two rotations and stopped, and the loom W1, that is, the weft yarn Y1 that was woven immediately before the error yarn Y2, restarts as shown in Figure 5 (C). It is possible to adjust the heating point P to the optimum value at the time, and no weaving steps occur when the machine is restarted.

This effect of preventing the occurrence of weaving steps is achieved by releasing the electromagnetic clutch 40 from the operational connection within a predetermined machine rotation angle range when the machine table is reversed, and stopping the reversal of the warp beam shaft 1a and the winding shaft 10. is obtained from warp beam 1
Based on the warp pull-back stop on the side and the pull-back stop on the woven fabric W side, the return amount of the woven fabric is stopped by a set amount, and Wl due to loosening of the fabric near the woven fabric as described in the prior art Previous Return 1) Overflow is prevented and Wl
This is because the previous point is adjusted to the optimal beating 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 cut weft was detected by the weft detection device, resulting in normal weft insertion. On the other hand, if a weft supply error occurs such that subsequent weft injection is not performed, 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 such a case of reverse rotation of the machine, the excessive return of the fabric front W1 due to the reverse rotation of the machine base is corrected by disengaging the electromagnetic clutch 40, and the fabric front W1 is adjusted to a one-timing point P, such as the optimum for restarting. .

Note that the present invention is not limited to the above embodiments,
For example, the embodiments shown in FIGS. 6-8 are also possible.

In the embodiment described above, the electromagnetic clutch 40 is attached to the shaft 16 that rotatably supports the double pulley 17, and the warp beam shaft 1
a and the drive force transmission to the winding shaft 10 were simultaneously controlled,
In this embodiment, electromagnetic clutches 45 and 46 are respectively attached to the shaft 19 that rotatably supports the pulley 20 and the shaft 36 that rotatably supports the gear 37, and each electromagnetic clutch 45. 46 operational connections can be opened and closed independently of each other. Therefore, by appropriately controlling the activation/decoupling period of each electromagnetic clutch 45, 46, it is possible to adjust the weave W1 to the optimum beating point P at the time of restart, as in the previous embodiment, and also to prevent the loosening of the textile weave. For large woven fabrics, the warp pull-back amount is greater than the woven fabric unwinding amount to increase warp tension, or for woven fabrics with small slackness, the woven fabric winding is greater than the warp pull-back amount. It is possible to reduce the tension of the warp yarns at the time of restart by increasing the return amount.

In addition, in the present invention, the electromagnetic clutch 40.45.46 starts operating and disconnecting during the reverse rotation of the machine instead of at the same time as the start of reverse rotation of the machine.
A timer may be used to set the timing for restoring the operational connection of 6.

Furthermore, the electromagnetic clutch may be installed at an appropriate position in the drive path of the warp sending out device and the winding device other than the mounting position in the above embodiment, or the machine reverse rotation can be performed by hand, and the machine reverse rotation start signal can be used. The electromagnetic clutch may be disengaged accordingly.

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 rows 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, so that the weaving bed position is adjusted to a predetermined position. It has an excellent effect of preventing the occurrence of weaving steps at the time of startup.

[Brief explanation of the drawing]

1 to 5 show an embodiment embodying the present invention.
The figure is a schematic side view of the loom, Figure 2 is a partially cut-away plan view of the main part showing the state in which the electromagnetic clutch is operatively connected, and Figure 3 is a partially cut-away plan view of the main part showing the state in which the electromagnetic clutch is released from the operative connection. Figure 4 is a side view showing the vicinity of the warp opening, Figure 5(a),
(b) and (c) are both side views showing the vicinity of the front of the woven fabric, Figs. 6 to 8 show separate parts of the present invention, Fig. 6 is a schematic side view of the loom, and Fig. 7 is FIG. 8 is a partially cutaway plan view of essential parts showing a state in which the pair of electromagnetic clutches are operatively connected, and FIG. Warp beam 1, surface roller 6, take-up shaft 10, transmission 15, electromagnetic clutch 40, 45, 46, Orimae W1゜Patent applicant: Toyota Industries Corporation, Agent
Patent Attorney On 1) Hironobu Figure 7

Claims (1)

[Claims] 1.I! An electromagnetic clutch is interposed in the drive path of a warp delivery device equipped with a transmission that controls the amount of warp delivery based on fluctuations in thread tension and in the drive path of the fabric winding device,
A loom characterized in that the electromagnetic clutch is decoupled 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, etc., to stop pulling back the warp and rewinding the woven fabric. A method for preventing the occurrence of weaving steps.