JPS60224839A - 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 tLjy from occurring in a weaving machine.

PRIOR ART In general, the warp feeding device of #A machine is equipped with a transmission that controls the warp feeding field based on fluctuations in warp tension, and is capable of keeping the tension of the warp fed from the warp beam within an appropriate tolerance range. In order to maintain the warp thread tension, 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 activated to increase the warp delivery speed of the warp beam. On the other hand, when the warp tension deviates from the allowable range and becomes small, the speed ratio of the transmission is adjusted in the direction of decreasing the warp delivery speed of the warp beam. There is.

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 it has been stopped, the strength of the reed due to the rising characteristics of the loom is not as strong as when the loom is running normally, and the fabric is not as strong. A film forms. Therefore, conventionally, when restarting the 111111 after stopping, 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 the occurrence of weaving steps, Is
Regardless of the reason for stopping the loom, the warp tension was uniformly increased when the loom was restarted, so when the loom was stopped and then restarted, the effect of preventing weaving steps was obtained, but the weft After the operation of Im is stopped due to a insertion error, the machine is reversed to process the error yarn, and then the machine is restarted. I couldn't get any effect. 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 weaving step prevention effect include the shedding movement when reversing the machine table to remove misplaced threads, 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 structure of the woven fabric immediately after fabrication, and the front of the weaving moves from its original position to the rear of the loom, which is the cause of the occurrence of weave rows.

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

Purpose The present invention has been made by carefully considering the above-mentioned problems, and its purpose is to solve the problem when restarting the machine after reversing the machine due to an error in inserting or feeding a weft. 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-mentioned object, the present invention provides a warp delivery device equipped with a transmission that controls warp delivery collapse based on warp tension fluctuations, and an electromagnetic clutch is provided on the input side or output side of the transmission. In order to balance the warp tension on the warp sending side and the fabric winding side, the electromagnetic clutch is released for a predetermined period of time during the machine reversal period after the machine is stopped due to a weft insertion error or a weft supply error (L, etc.). , so that Orimae is in the correct position when restarting after reversing the machine.

EXAMPLE Below, the present invention will be embodied in a fluid jet machine, and the example will be explained based on the drawings. After being guided to the 4 side and woven into the fabric W in the same opening system 4, the leaf varnish [ ]-ra 6 which is in pressure contact with the presto beam 5 is shuttled out between the press roller 7 and the wrinkle removing guide section. After being slidably guided at the angle 8, it is wound onto a winding shaft 9 which is connected to the machine drive motor M via a crankshaft 41.

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 50 suspended from the other end of the tension lever 11 allows the tension roller 3 to move the warp. r
The warp threads T are pressed against each other, and a predetermined tension is applied to the warp threads T.

Therefore, the tension roller 3 is displaced up and down according to the tension fluctuation under the warp, and this up and down movement is caused by the tension lever 11.
and a speed change lever 13a of a transmission 13 that constitutes a warp delivery device via a link 12 connected to the same lever 11.
transmitted to.

For the same speed 11113, input pulley 13b and output gear 1
3c, the rotary driving force of the machine drive motor M is applied to a pulley 15 fixed to the shaft 14, a pulley 16 operatively connected to the pulley 15, and a shaft 1 that looks at the pulley 16.
The signal is transmitted to the input pulley 13b of the transmission 13 via a pulley 18 rotatably supported on the ground. In this embodiment, during this drive path, i! The magnetic clutch 19 is MWed.

A clutch rest 19a, which is slidable in the direction of the shaft 17 and unrotatably supported on the same shaft 17, is always pressed by a spring 19b to the clutch portion 18a of the pulley 18, which is rotatably supported on the shaft 17. When the pulley 17 is rotated, the pulley 18 is also rotated. Then, when the solenoid 19c is energized, the clutch deactivation 19a resists the action of the spring 19b and the clutch portion 18a is turned off as shown in FIG.
The rotation of the shaft 17 is not transmitted to the pulley 18. Solenoid 19C is a control device based on the ON operation of machine reverse operation button B! It is designed to be excited by commands from the IC. The control device C only controls the range of the machine rotation angle set based on the detection signal from the machine rotation angle detection device [20 (for example, a known rotary encoder is used) (within the solenoid 19
The excitation command is sent to c.

The transmission 13 is configured such that the rotation direction on the input side is always rotated in one direction on the output side, that is, the rotation direction is changed so that the warp threads T are not sent out from the warp beam 1. Accordingly, a reversing mechanism 21 is provided between the output gear 13c of the transmission 13 and the warp beam shaft 1a.

That is, the shaft 23 of the gear 22 meshing with the output gear 13C
A pair of opposing bevel gears 26a and 26b are attached to the bevel gear 24 provided at one end so as to be unrotatable with respect to the shaft 25, but slidable in the coaxial direction, and can be engaged with the bevel gear 24. The switching lever 32, which is energized by moving around the solenoid 34, is switched in accordance with the excitation and demagnetization of the electromagnetic solenoid 31. During normal operation and stop of the 11 machines, the bevel gear 26a meshes with the bevel gear 24, and the rotation of the output gear 13c is controlled by the gear 22, the bevel gear 24.26a, and the worm at one end of the shaft 25. 27, worm gear 28 and the same gear 2
The warp beam is transmitted to the warp beam gear 1b via a gear 30 which is screwed onto the other end of the shaft 29 to which the warp threads T are fixed, and the warp beam shaft 1a is rotated in the direction to send out the warp threads T. The machine has stopped, Yu, forward! Based on the ON operation of the machine reverse operation button B, the electromagnetic solenoid 31 is excited by the excitation command from the device C, and the switching lever 32 is moved counterclockwise around the shaft 34 against the spring 33. Rotated, 31st i! As shown in I, the bevel gear 26b meshes with the bevel gear 24.

Therefore, the rotation of the output gear 13c is converted to the direction opposite to the tgJ arrangement and transmitted to the warp beam axis 1a, and the rotation of the output gear 13c is transmitted to the warp beam axis 1a.
The arm shaft 7a pulls the warp threads T and is rotated in the F dimension direction.

In this embodiment, the machine rotation angle when the machine stops is θ, and the excitation command from the control device MC to the solenoid 19c based on the ON operation of the machine reverse operation button B is [θ1. θ1
This is performed within a machine rotation angle range of (θ1 minus θ), and the operation of this embodiment will be explained below based on this condition.

Now, *1M is in a normal operating state, and as shown in FIG.
A weft is injected from a main nozzle (not shown) into the weft guide hole 36a, and is driven into the facing W1 of the fabric W by H37. 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 fabric W is wound around the winding shaft 9. 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 13a. That is, the gear ratio of the transmission 13 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 warp tension is always maintained at an appropriate level,
No weaving steps occur in the fabric W.

When a weft insertion error occurs, the operation of the machine is stopped based on a weft insertion error detection signal from a special yarn detection device (not shown) provided on the slay 35 at the receiving and receiving end. At this time, as shown in FIG. 5(a), the mistake yarn Y2 is the woven fabric W
After that, the machine base is approximately 1
When the machine rotates and stops at the rotation angle θ just before the weft Y3 following the missed yarn Y2 is beaten, the loom W1 and the length, that is, the missed yarn Y2, reach the beating point P of the reed 37. ni place I [do. Therefore, in order to remove the misplaced thread Y2, when the machine reverse operation button B is pressed, an excitation command is sent from the control device C to the solenoid 19C of the electromagnetic clutch 19 and the electromagnetic solenoid 31, and to the drive motor M. A reverse operation command is sent to the electromagnetic clutch 19, and the machine is reversed with the pull operation connection being released and the operation connection in the reversing mechanism 21 being switched to the reverse direction. When the machine rotates approximately half a turn and the warp threads 11 and T2 reach the maximum opening state, first the lc weft Y3, which is inserted following the miss yarn Y2, is pulled out, and then the machine rotates approximately half a turn and then reverses direction 1. ], as shown in Figure 5(b), when J and sea urchin reach the maximum opening state again, Z4C'
:1q! As shown in FIG. 4, when f137 reaches the position indicated by the solid line, the missed thread Y2 is removed from the woven fabric W. Mistake thread Y2
After removing the machine, 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 01 during the machine reverse rotation, which is performed after the machine stops due to the weft insertion error, the control device C is activated by the angle detection signal from the machine rotation angle detection 8@20. is one electromagnetic clutch solenoid 19c
The excitation command to the clutch 19a is stopped and the pulley 18
The electromagnetic clutch 19 is pressed again to the clutch portion 18a of the
The work vJ connection in is restored. Therefore, from the machine stop angle θ to the machine rotation angle θ1, the winding shaft 9 is reversed and the woven fabric W is rewound, but the warp beam shaft 1a remains in a stopped state without rotating 3L, and the warp Compared to the case where the beam axis 1a and the winding axis 9 are reversed at the same time, the retracting distance of the woven cloth W1 is reduced and the tension of the warp threads T is also reduced.

When the machine rotation angles are 01 and 4c, the detection signal from the machine rotation angle detection device 20 causes the control station C to stop the excitation command to the solenoid 19C of the electromagnetic Clara J19, and the electromagnetic The clutch 19 is disengaged and the warp beam shaft 1a begins to rotate in reverse. Therefore, the warp beam axis 1a and the take-up axis 9 are simultaneously reversed, and the Orimae w1
moves back.

Therefore, the disengagement time of one double clutch is set appropriately according to the type of woven fabric to suppress the reversal field of the entire woven fabric and warp, so even if the phenomenon of loosening of the woven fabric occurs, weft insertion errors can be avoided. 2 from the time when the machine became f″li' tl.
In the state where the rotation is reversed and stopped, the woven fabric IW1, that is, the weft yarn Y1 woven just before the miss yarn Y2, coincides with the beating point P at the time of restart, as shown in Fig. 5 (C), and the machine restarts. No weaving steps will occur at startup.

Such a weaving stage generation prevention effect is achieved by disengaging the electromagnetic latch 119 during a predetermined machine rotation angle range when the machine table is reversed, stopping the reversal of the weave shaft 1a, and starting the winding process. This is obtained from the fact that only the shaft 9 is reversed in row 4, and the tension balance is achieved based on the stop of pulling back the warp threads and the unwinding of the fabric on the winding shaft 9 side. This is because the woven fabric is prevented from returning too much due to loosening of the fabric near 4tH'i, and the woven fabric is aligned with the beading point P at the time of restart.

When the weft insertion error occurred, the machine reversed itself twice, but the weft yarn broke in the main nozzle (not shown), and the cut weft yarn 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 carried out, it is necessary to reversely rotate the machine three times. This is because, after the cut weft is woven into the woven fabric, the machine table rotates twice in conjunction with the weft supply operation. Even in such a case of reverse rotation of the machine, the excessive return of the textile cloth W1 due to the reverse rotation of the machine base is corrected by releasing the operational connection of the electromagnetic clutch 19, and the textile cloth W1 coincides with the beating point P at the time of restart.

In addition, in this embodiment, if the reversing mechanism 21 is made switchable so that the warp can be sent out even when the machine table is reversed, the warp tension can be appropriately reduced by controlling the warp sending period when the machine table is reversed. The position of W1 can be corrected.

Note that the present invention is not limited to the above embodiments,
For example, instead of releasing the electromagnetic clutch 19 at the same time as the machine starts reversing, the electromagnetic clutch 19 may be released during the machine reversing. Further, the timing for returning the electromagnetic clutch 19 to the operational connection may be set using tines. Further, the electromagnetic clutch may be provided on the output side of the speed change 1fi13, or the machine may be manually reversed, and the electromagnetic clutch may be disengaged in response to a machine reverse start signal.

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 IJ.

Effects As explained in detail above, the weaving stage hoist guard 11/J method of the present invention can prevent weft insertion errors or weft supply errors when the IVJ position coincides with the predetermined position t after the machine is reversed. This has an excellent effect of preventing the occurrence of ij Zy l5pj during restart #1 after the machine is reversed.

[Brief explanation of drawings]

The drawings show an embodiment embodying the present invention, and FIG. 1 is a schematic side view of a loom, and FIG. 2 is an operation 3IPI of an electromagnetic clutch.
3 is a partially broken plan view of the main part showing the state Ii, FIG. 3 is a partially broken plan view of the main part showing the state where the electromagnetic clutch is released from operation, FIG. 4 is a side view showing the warp opening area, and FIG. Diagram (a)
, (b), and (c) are side views that do not show the vicinity of the front of the fabric. Warp beam 1, transmission 13, electromagnetic clutch 19, Orimae W1゜Patent applicant Toyota Automatic Oriiso Manufacturing Co., Ltd. Agent
Patent Attorney On 1) Hakusenyumi, Ω ＾ -ノ ~ノ 0 Ku Me Wrinkle

Claims (1)

[Claims] 1. In a warp delivery device equipped with a transmission that controls warp delivery based on warp tension fluctuations, an electromagnetic clutch is interposed on the input or output side of the transmission to prevent weft insertion errors or weft supply errors. A method for preventing the occurrence of weaving steps in a loom, comprising: releasing the operational connection of the electromagnetic clutch for a predetermined period of time during a machine reversal period after the machine is stopped due to a machine stop, etc., and stopping pulling back of warp threads.