JP4057089B2 - Method and device for preventing weaving steps in looms - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a device for preventing the occurrence of a weaving step caused by a slow operation of a machine base during weaving stop.
[0002]
[Prior art]
When the weaving machine operation is stopped manually or due to warp cutting and then restarted, the punching strength is not sufficient in relation to the machine stand-up characteristics, and the woven fabric tends to be thin. In addition, when the weaving machine is stopped due to a weft insertion error, the machine base is reversely rotated to perform the miss yarn processing, and after that, when the machine base is restarted, the machine base reverse rotation is performed to remove the missed yarn. At this time, the fabric structure near the pre-weaving immediately after weaving is loosened, and the pre-weaving tends to move from the original position to the rear of the loom.
[0003]
In order to prevent the occurrence of such a weaving step, conventionally, the starting torque of the loom is increased, or the weaving step is prevented by correcting the pre-weaving position when the loom is restarted.
There is what is called a twill pillow as a kind of weave. While the weaving is stopped, the weaving loom is thrown forward by the slow or reverse rotation of the loom, and the weaving of the weaving cloth is struck by the scissors.This action causes the wefts on the weaving to shift in the vertical direction of the weaving cloth. It rises like a pillow. Such twill pillows tend to occur with twill fabrics. Further, even if it is not a twill weave, the weft density before weaving is increased by the beating at the time of slow operation of the loom, and the weaving step occurs. Since such a weaving stage is generated by the slow operation of the loom while weaving is stopped, the conventional weaving stage preventing means for preventing the weaving stage from being generated when the loom is restarted cannot be prevented.
[0004]
Japanese Laid-Open Patent Publication No. 3-76848 discloses a weaving step prevention device that changes the relative positions of the front and the weaves so that they do not come into contact with each other when the weaving machine slows down while weaving is stopped. If the weaving cloth and the heel are not brought into contact with each other during the loom slow operation, the weaving cloth will not be hit by the heel and it is possible to prevent the weaving step from being caused by the slow operation of the loom.
[0005]
There are a method of changing the swing range of the kite and a method of moving the fabric before changing the relative position of the kite and the kite, but the mechanism for changing the swing range of the kite is too complicated. In order to move before weaving, it is necessary to move both the warp feeding device and the weaving device to move the woven fabric. However, in the place of the temple device which prevents the width of the woven fabric from shrinking immediately after weaving, the woven fabric is used. Is different from other parts. Further, the tension at the center of the weaving width is higher than the tension at the weaving end side, and the amount of movement before weaving varies depending on the position in the weaving width direction. As a result, weaving steps occur.
[0006]
In the apparatus disclosed in Japanese Patent Laid-Open No. Hei 5-59640, during the slow operation of the loom, for example, the warp tension is set low in the case where a thick stage tends to occur, and the warp tension is set high in the case where a thin stage tends to occur. By changing the warp tension, the striking force of the loom slow operation is adjusted to prevent the occurrence of the weaving step.
[0007]
[Problems to be solved by the invention]
However, in the apparatus disclosed in Japanese Patent Laid-Open No. 5-59640, the change in warp tension causes the pre-weaving position to move unevenly in the weaving width direction for the reasons described above, and it is difficult to prevent complete weaving steps.
[0008]
An object of this invention is to prevent the weaving stage generation | occurrence | production accompanying a weaving stop.
[0009]
[Means for Solving the Problems]
Therefore, according to the first aspect of the present invention, between the time when weaving is stopped and the time when weaving is resumed, the reversible feed motor that rotates the warp beam wound with the warp yarn and the take-up roller that picks up the woven fabric can be rotated. The warp tension is changed so that the warp tension is different from the warp tension during normal operation in a state in which the front of the woven fabric does not move by synchronously controlling the take-up motor and rotating it in opposite directions.
[0010]
Since there is no situation in which the weaving does not move and the amount of movement before weaving varies depending on the position in the weaving width direction, weaving steps due to uneven movement before weaving do not occur.
According to the second aspect of the present invention, the warp tension and the woven fabric tension are reduced in the case where the kite passes through the hammering position during the slow operation of the loom while weaving is stopped.
[0011]
Since the warp tension is reduced, no weaving step occurs even if the kite strikes the front of the weave. Further, since the cloth does not move, there is no weaving step due to uneven movement before weaving.
In the invention of claim 3, before weaving resumption it was to temporarily higher than the warp tension during the normal operation of the warp tension and fabric tension.
[0012]
Insufficient beating force at the start-up of the loom is compensated by a temporary high tension state, and no weaving steps due to the lack of beating force occur.
In the invention of claim 4, a feed motor capable of rotating forward and reverse that rotates a warp beam wound with a warp, a winding motor capable of rotating forward and reverse that rotates a take-up roller for picking up a woven fabric, and from when weaving is stopped until weaving is resumed. The warp tension is controlled so that the warp tension is different from the warp tension during normal operation when the weaving front does not move by synchronously controlling the feed motor and the take-up motor and rotating them in opposite directions. And a weaving step preventing device including a tension change control means.
[0013]
While weaving is stopped, the tension change control means controls the feeding motor and the take-up motor to operate synchronously to prevent movement before weaving. Accordingly, there is no weaving step due to uneven movement before weaving.
[0015]
When weaving is stopped, the warp tension is lowered if the feed motor is rotated forward to feed the warp from the warp beam, and the warp tension is increased if the feed motor is reversed and the warp is pulled back to the warp beam. If weaving is stopped while weaving is stopped and the woven fabric is taken up, the woven fabric tension is increased. If the winding motor is reversed and the woven fabric is returned to the warp side, the woven fabric tension is decreased. The feeding motor is suitable as the warp tension changing means, and the winding motor is suitable as the woven fabric tension changing means.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
[0019]
FIG. 1 schematically shows a side view of the entire loom. M is a loom drive motor, and the loom drive motor M is controlled by the loom control computer C. Reference numeral 11 denotes a feed motor that is independent of the loom drive motor M and can be rotated forward and backward. The feed motor 11 drives the warp beam 12. The warp T fed from the warp beam 12 is passed through the ridges 15 and 16 via the back roller 13 and the tension roller 14. The woven fabric W is wound around the cross roller 21 via the expansion bar 17, the surface roller 18 serving as a take-up roller, the press roller 19, and the wrinkle removing guide member 20.
[0020]
The surface roller 18 that pulls the woven fabric W toward the cross roller 21 in cooperation with the press roller 19 is driven by a winding motor 22 that is independent of the loom driving motor M and can be rotated forward and backward. The cross roller 21 rotates forward and backward in conjunction with the surface roller 18. The loom control computer C commands the forward rotation operation of the winding motor 22 based on the ON signal from the start switch 28. The loom control computer C performs feedback control on the rotational speed of the feed motor 11 based on the rotational angle detection signal from the rotary encoder 221 incorporated in the winding motor 22.
[0021]
The tension roller 14 is attached to one end of the tension lever 23, and tension is applied to the warp T by a tension spring 24 attached to the other end of the tension lever 23. The tension lever 23 is rotatably supported at one end of the detection lever 25, and a load cell 26 is connected to the other end of the detection lever 25. The warp tension is transmitted to the load cell 26 via the tension roller 14, the tension lever 23, and the detection lever 25, and the load cell 26 outputs an electric signal corresponding to the warp tension to the loom control computer C.
[0022]
The loom control computer C compares the warp tension Fo set in advance with the detected tension F grasped by the input signal and the warp beam diameter grasped by the detection signal from the rotary encoder 27 for detecting the rotation angle of the loom. The rotational speed of the delivery motor 11 is controlled. As a result, the warp tension Fo during normal operation is controlled and the occurrence of weaving steps during weaving is prevented. The loom control computer C commands the forward rotation operation of the feed motor 11 based on the ON signal from the start switch 28. The loom control computer C feedback-controls the rotational speed of the feed motor 11 based on the rotation angle detection signal from the rotary encoder 111 incorporated in the feed motor 11.
[0023]
An input device 29 for changing and controlling the warp tension is connected to the loom control computer C. The input device 29 sets a warp tension F1 at the time of slow operation of the loom during the weaving stop and a warp tension F2 at the time of resuming the weaving. The warp tension F1 is considerably lower than the warp tension Fo during normal operation, and the warp tension F2 is higher than the warp tension Fo during normal operation.
[0024]
Reference numeral 30 is a stop switch, 31 is a slow reverse rotation switch for slow reverse rotation of the loom drive motor M, and 32 is a slow forward rotation switch for slow reverse rotation of the loom drive motor M.
[0025]
The loom control computer C performs the tension change control shown in the flowcharts of FIGS. 3 to 6 based on the tension change control content input by the input device 29.
The loom control computer C responds to the abnormality detection signal from the weft insertion detector 33 and the warp cut detector 34 or the ON signal from the stop switch 30 to the loom drive motor M, the feed motor 11 and the take-up motor 22. Command to stop operation. As a result, the loom drive motor M, the feed motor 11 and the take-up motor 22 are stopped synchronously as shown by the waveforms C1, C2 and C3 in FIG. 2, and the feed of the warp T and the take-up of the woven fabric W are stopped. The scissors 16 stop at a position just before the striking shown by a chain line in FIG.
[0026]
When the weaving stop signal S1 shown in FIG. 2 is from the weft insertion error detector 33, the loom control computer C instructs the feed motor 11 to perform slow forward rotation and also throws to the take-up motor 22. Command reverse. The warp T is sent out from the warp beam 12 by the slow forward rotation of the feed motor 11, and the warp tension F is lowered. By the slow reverse rotation of the take-up motor 22, the woven fabric W is returned to the warp T side and the fabric tension is lowered. . The take-up motor 22 operates in synchronization with the feed motor 11. This synchronous operation is performed so that the woven cloth W1 of the woven cloth W does not move. For example, the synchronous operation is controlled so that the ratio between the amount of warp T fed from the warp beam 12 and the amount of return of the woven fabric W becomes constant over time.
[0027]
The graph in FIG. 7A represents this synchronous operation, and the horizontal axis represents time. The vertical axis represents the amount of warp movement on the peripheral surface of the warp beam 12 and the amount of movement on the peripheral surface of the surface roller 18. Curve E represents the warp movement amount, and curve F1 represents the woven fabric movement amount. The upward right portion of the curve E represents the delivery of the warp T, and the upward right portion of the curve F1 represents the return of the woven fabric W. Since the elastic coefficients of the warp T and the woven fabric W are different, it is possible to prevent the pre-weaving W1 from moving by making the movement amount of the warp T different from the movement amount of the woven fabric W.
[0028]
If there is no movement before weaving, the ratio between the feed amount of the warp T and the return amount of the woven fabric W does not become constant over time as shown in FIG. 7B or 7C. Synchronous control may be performed. Curves F2 and F3 represent the moving amount of the woven fabric.
[0029]
Such a synchronous operation is performed until the detected tension F becomes equal to the set warp tension F1, and when F = F1, the slow operations of the feed motor 11 and the take-up motor 22 are stopped.
[0030]
Slow operation of the feed motor 11 and the take-up motor 22 for the tension change waveform s1 ⁺ in FIG. 2, t1 ^- after performed as shown in, weft processing is performed. When a weft insertion error occurs, for example, weft insertion error processing is performed using a weft processing device as disclosed in Japanese Patent Laid-Open No. 2-61138. This weft insertion error processing is performed in a state where the miss yarn woven on the pre-weaving W1 is released from the gripping action of the warp T, and the loom is reversely rotated by about one and a half times to release this grip. By this slow reversal, the scissors 16 pass through a striking position for striking the weaving front W1.
[0031]
After the slow operation of the feed motor 11 and the take-up motor 22 for changing the tension, the loom driving motor M reverses by about one and a half times as shown by the waveform r1 in FIG. 2, and the loom forms the maximum opening of the warp T. Slow reverse to position. As a result, the reed 16 moves to the last retracted position indicated by the solid line in FIG. 1, and the warp T forms the maximum opening. By forming this opening, the missed yarn on the pre-weaving W1 is released from the gripping action of the warp yarn T, and the weft insertion error processing becomes possible.
[0032]
After the weft insertion error processing is completed, the loom drive motor M performs slow reverse rotation as indicated by the waveform r2, and the loom reversely throws back to the weaving start position immediately before the beating. This is in order to avoid a lack of hammering force at the start of weaving.
[0033]
After the loom is reversely slowed to the weaving start position, the feed motor 11 is reversely slowed as indicated by the waveform s2 ⁻ , and the take-up motor 22 is forwardly rotated slowly as indicated by the waveform t2 ⁺ . The warp T is rewound onto the warp beam 12 by the slow reverse rotation of the feed motor 11 and the warp tension F is increased. By the slow forward rotation of the take-up motor 22, the woven fabric W is taken to the cross roller 21 side and the woven fabric tension is increased. To increase. The take-up motor 22 operates in synchronization with the feed motor 11. This synchronous operation is performed so that the woven cloth W1 of the woven cloth W does not move. The synchronous operation is controlled so that the ratio of the unwinding amount of the warp T from the warp beam 12 and the take-up amount of the woven fabric W becomes constant over time.
[0034]
The lower right portion of the curve E in FIG. 7A represents the rewinding of the warp T, and the lower right portion of the curve F1 represents the take-up of the woven fabric W. This synchronous operation is performed until the detected tension F matches the set warp tension F2, and when F = F2, the slow operations of the feed motor 11 and the take-up motor 22 are stopped.
[0035]
Thereafter, the loom drive motor M, the feed motor 11 and the take-up motor 22 enter the forward rotation operation synchronously as indicated by the waveforms D1, D2 and D3, and weaving is started. Based on the loom rotation angle information from the rotary encoder 27, the loom control computer C grasps the number of times the hammering is performed after weaving is resumed. When the number of beats after resuming weaving reaches a predetermined number n (for example, several times), the loom control computer C performs tension return control for returning the warp tension to the normal set warp tension Fo.
[0036]
When a weaving stop signal S2 other than a weft insertion error such as a weaving stop signal input from the warp cutting detector 34 or the stop switch 30 is input, the loom control computer C prepares for an ON signal S3 input from the start switch 28.
[0037]
After the warp cutting process, when the input is ON signal S3 from the activation switch 28, feed motor 11 is thrown forward as shown by the waveform s3 ^+, take-up motor 22 is a waveform t3 ^- throw reversed as indicated by. The warp T is sent out from the warp beam 12 by the slow forward rotation of the feed motor 11, and the warp tension F is lowered. By the slow reverse rotation of the take-up motor 22, the woven fabric W is returned to the warp T side and the fabric tension is lowered. . The take-up motor 22 operates in synchronization with the feed motor 11. This synchronous operation is performed so that the woven cloth W1 of the woven cloth W does not move. The synchronous operation is controlled so that the ratio between the amount of warp T delivered from the warp beam 12 and the amount of woven fabric W returned is constant over time. This synchronous operation is performed until the detected tension F matches the set warp tension F1, and when F = F1, the slow operations of the feed motor 11 and the take-up motor 22 are stopped.
[0038]
Next, the loom drive motor M performs slow reverse rotation as indicated by the waveform r3, and the loom reversely throws back to the weaving start position immediately before the hammering.
After the loom is reversely slowed to the weaving start position, the feed motor 11 is reversely slowed as indicated by the waveform s4 ⁻ , and the winding motor 22 is forwardly rotated slowly as indicated by the waveform t4 ⁺ . The warp T is rewound onto the warp beam 12 by the slow reverse rotation of the feed motor 11 and the warp tension F is increased. By the slow forward rotation of the take-up motor 22, the woven fabric W is taken to the cross roller 21 side and the woven fabric tension is increased. To increase. The take-up motor 22 operates in synchronization with the feed motor 11. This synchronous operation is performed so that the woven cloth W1 of the woven cloth W does not move. The synchronous operation is controlled so that the ratio of the unwinding amount of the warp T from the warp beam 12 and the take-up amount of the woven fabric W becomes constant over time. This synchronous operation is performed until the detected tension F matches the set warp tension F2, and when F = F2, the slow operations of the feed motor 11 and the take-up motor 22 are stopped.
[0039]
Thereafter, the loom drive motor M, the feed motor 11 and the take-up motor 22 enter the forward rotation operation synchronously as indicated by the waveforms D1, D2 and D3, and weaving is started. When the number of beats after resuming weaving reaches a predetermined number n (for example, several times), the loom control computer C performs tension return control for returning the warp tension to the normal set warp tension Fo.
[0040]
The following effects can be obtained in the first embodiment.
(1-1) By the slow reverse rotation of the loom about once and a half, the scissors 16 pass through the scissor position and the weaving front W1 is hit by the scissors 16. Further, also in the case of slow reverse rotation for avoiding the lack of striking force, the scissors 16 pass through the striking position and the weaving W1 is beaten. However, prior to the slow reverse rotation of the loom, the warp tension is set to a tension F1 lower than the warp tension Fo at the time of weaving, and the occurrence of weaving steps due to the beating due to the slow reverse rotation of the loom is prevented. Further, at the start of weaving, the warp tension is set to a tension F2 higher than the warp tension Fo at the time of weaving, and the lack of beating force due to insufficient acceleration of the reed 16 is compensated.
[0041]
At the time of the slow operation of the feed motor 11 serving as the warp tension changing means for performing such tension control, the take-up motor 22 serving as the woven cloth tension changing means prevents the movement of the pre-weaving W1 of the woven cloth W from moving. The loom control computer C is controlled synchronously. That is, during the period from when weaving is stopped to when weaving is resumed, the warp tension and the fabric tension are adjusted so that the pre-weaving W1 of the fabric W does not move. Since there is no situation in which the movement amount of the pre-weaving W1 varies depending on the position in the weaving width direction, no weaving step due to uneven movement of the pre-weaving W1 does not occur.
(1-2) Since the shortage of the striking force at the start-up of the loom is compensated by the temporary high tension state, no weaving steps due to the lack of striking force will occur.
(1-3) The feed motor 11 is suitable as warp tension changing means, and the winding motor 22 is suitable as woven fabric tension changing means.
[0042]
Next, a second embodiment of FIG. 8 will be described. The same components as those in the first embodiment are denoted by the same reference numerals.
In this embodiment, a pre-weaving position detector 35 for detecting the position of the pre-weaving W1 is installed. The loom control computer C performs tension change control based on the pre-weaving position detection information obtained by the pre-weaving position detector 35. That is, when the feed motor 11 is slow-operated as in the first embodiment, the take-up motor 22 is feedback-controlled based on the pre-weave position detection information so that the position of the pre-weave W1 does not move. The When a weft insertion error occurs, the weaving position detector 35 is operated after weaving is stopped. When weaving is stopped due to a stop cause other than the weft insertion error, a weaving start signal is input to the loom control computer C and then the weaving position is detected. The detector 35 is activated.
[0043]
In the second embodiment, the following effects can be obtained.
(2-1) The same effect as the first embodiment can be obtained.
(2-2) The woven fabric tension is controlled based on the pre-weaving position information detected by the pre-weaving position detector 35 serving as the pre-weaving position detecting means. The method of detecting the actual position of the woven cloth W1 and controlling the woven fabric tension so as not to move the woven cloth W1 is most reliable in that the woven cloth W is not moved.
[0044]
The feed motor 11 may be feedback-controlled based on the pre-weave position detection information so that the position of the pre-weave W1 does not move.
Next, a third embodiment of FIG. 9 will be described. The same components as those in the first embodiment are denoted by the same reference numerals.
[0045]
In this embodiment, the surface roller 18 obtains a driving force from the loom driving motor M, and the driving force transmission system from the loom driving motor M to the surface roller 18 is interrupted when the loom driving motor M is rotating forward slowly. An air cylinder 36 is operatively connected to the support lever 39 that supports the expansion bar 17. The support lever 39 is urged by a spring 37 in a direction to apply tension to the woven fabric W. The support lever 39 can be oscillated and displaced by the air cylinder 36, and the fabric tension is changed by the displacement of the expansion bar 17 accompanying the oscillating displacement of the support lever 39. The air pressure in the air cylinder 36 is controlled by an electropneumatic regulator 38. The air cylinder 36 and the electropneumatic regulator 38 constitute woven fabric tension changing means.
[0046]
The loom control computer C controls the pressure setting state of the electropneumatic regulator 38 for pressure adjustment. If the pressure setting of the electropneumatic regulator 38 is changed, the air pressure in the air cylinder 36 is changed, and the expansion bar 17 is displaced. During the slow operation of the feed motor 11 while weaving is stopped, the loom control computer C controls the pressure setting of the electropneumatic regulator 38 while watching the tension change of the warp T so that the pre-weaving W1 does not move.
[0047]
In the present invention, the following embodiments are also possible. The apparatus configuration is the same as that of the first embodiment.
In this embodiment, the warp tension change during the slow operation of the loom while weaving is stopped is performed by setting the slow rotation amounts S1 ⁺ and S2 ^{− of the} feed motor 11 and the slow rotation amounts T1 ⁻ and T2 ⁺ of the winding motor 22. It is. Each set amount S1 ⁺ , S2 ⁻ , T1 ⁻ , T2 ⁺ is input and set in advance by the input device 29, and the warp tension is controlled in an open loop. The set amount S1 ⁺ corresponds to a change in the decrease in warp tension accompanying the stop of weaving, and the set amount T1 ⁻ corresponds to a change in the decrease in the fabric tension accompanying the stop of weaving. The set amount S2 ⁻ corresponds to a temporary increase change of the warp tension when weaving is resumed, and the set amount T2 ⁺ corresponds to a temporary increase change of the fabric tension due to the stop of weaving.
[0048]
Also in this embodiment, the slow rotations of the feed motor 11 and the take-up motor 22 are controlled synchronously so that the pre-weaving W1 does not move, and the occurrence of weaving steps due to the stop of weaving is prevented.
[0049]
The present invention can also be applied to the case where the movement of the pre-weaving position accompanying the elongation of the warp while weaving is stopped is prevented. In this case, an embodiment using a means for detecting a pre-weaving position is suitable, but an embodiment in which a warp tension change and a woven fabric tension change are set in advance in accordance with a change in warp elongation over time. Is also possible.
[0050]
【The invention's effect】
As described above in detail, in the present invention, the warp tension and the woven fabric tension are adjusted to prevent the woven fabric from moving before the weaving is stopped until the weaving is resumed. There is an excellent effect that generation can be surely prevented.
[Brief description of the drawings]
FIG. 1 is a schematic side view showing a first embodiment.
FIG. 2 is a graph for explaining tension control.
FIG. 3 is a flowchart showing a tension control program.
FIG. 4 is a flowchart showing a tension control program.
FIG. 5 is a flowchart showing a tension control program.
FIG. 6 is a flowchart showing a tension control program.
7A, 7B and 7C are graphs for explaining tension control. FIG.
FIG. 8 is a schematic side view showing a second embodiment.
FIG. 9 is a schematic side view showing a third embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Feeding motor used as warp tension change means, 22 ... Winding motor used as woven fabric tension change means, 35 ... Pre-weaving position detector used as pre-weaving position detecting means, C ... Loom control computer used as tension control means.

Claims (4)

Between the time when weaving is stopped and the time when weaving is resumed, the feed motor capable of rotating forward / reversely rotating the warp beam wound with the warp and the winding motor capable of rotating forward / reversely rotating the take-up roller for picking up the fabric are controlled synchronously. A method for preventing the occurrence of a weaving step in a loom, wherein the warp tension is changed so as to be different from the warp tension during normal operation in a state where the woven fabric does not move by rotating in the reverse direction.   2. The method of preventing the occurrence of a weaving step in a loom according to claim 1, wherein the warp tension and the woven fabric tension are reduced when the kite passes through the hammering position during slow operation of the loom while weaving is stopped. The method for preventing the occurrence of a weaving step in a loom according to any one of claims 1 and 2, wherein the warp tension and the fabric tension are temporarily higher than the warp tension during the normal operation before weaving is resumed. A feed motor capable of rotating forward and reverse to rotate a warp beam wound with a warp;
A take-up motor capable of rotating forward and backward to rotate a take-up roller for taking up the woven fabric;
Between the time when weaving is stopped and the time when weaving is resumed, the warp tension during normal operation is the warp tension in the state where the front of weaving does not move by synchronously controlling the feeding motor and the take-up motor and rotating them in opposite directions. A weaving step prevention device in a loom comprising tension change control means for controlling change so as to have different tensions.

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