JPH04281046A - Apparatus for preventing generation of weft bar in loom - Google Patents

Abstract

PURPOSE:To prevent the generation of weft bar caused by the interference between a guide bar and a cloth fell by the slow normal rotation or slow reverse rotation of a loom. CONSTITUTION:A feeding motor 1 is rotated at slow speed in normal direction prior to the slow reverse rotation or slow normal rotation of a loom motor M to prevent the weft insertion miss. The operation of the feeding motor 1 is controlled by a control computer C and the feeding motor 1 is rotated at slow speed in normal direction to a prescribed extent to move the cloth fell W1 from the swinging range of a reed 6 to the side of a woven cloth W. In the case of restarting the weaving operation, the feeding motor 1 is rotated at a slow speed in reverse direction to return the cloth fell W1 to the original position. The normal or abnormal state of the displacement of the cloth fell position can be grasped by the control computer C based on the information on the rotation transmitted from a rotary encoder 1a of the feeding motor 1. When the abnormal state is generated in the displacement of the cloth fell position, the reverse rotation of the motor is continued until the detected tension obtained by a load cell 15 reaches the warp tension immediately before the displacement of the cloth fell position.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing the formation of weaving stages due to slow forward rotation or slow reverse rotation of a weaving machine stand while weaving is stopped.

0002

[Prior Art] When a loom is restarted after it has been stopped manually or due to warp breakage, the beating strength is insufficient due to the stand-up characteristics of the loom, and thin steps tend to occur in the woven fabric. . In addition, if the loom is stopped due to a weft insertion error, the loom is slowly reversed to remove the erroneous thread, and then the loom is restarted, the loom is slowed to remove the erroneous thread. During reversal, the fabric structure near the front immediately after weaving loosens, and the front moves toward the rear of the loom from its original position, which tends to cause thick steps.

Means for preventing the occurrence of such weaving steps are disclosed in Japanese Patent Application Laid-open No. 60-231849 and Japanese Patent Application Laid-open No. 61-55.
This method is disclosed in Japanese Patent Application Laid-open No. 241, Japanese Patent Application Laid-open No. 62-263352, and Japanese Utility Model Application No. 63-94988.

0004

[Problems to be Solved by the Invention] There is a type of weave tier called a so-called twill pillow. During slow forward rotation or slow reverse rotation of the loom table while weaving is stopped, the front of the woven fabric is struck by the reed, and this action causes the wefts on the front to shift in the vertical direction of the woven fabric. This woven part rises like a pillow on the woven fabric. Although such twill pillows are likely to occur in twill fabrics, the above-mentioned conventional weaving step generation prevention means cannot prevent the occurrence of twill pillows.

The object of the present invention is to provide a device for preventing such bundling.

[0006]

[Means for Solving the Problems] To this end, in the present invention,
a cloth front position displacement means for changing the warp tension to displace the cloth front position of the woven fabric in the warp direction; a displacement drive control means for controlling the displacement driving force of the cloth cloth cloth position displacement means; A weaving stage generation prevention device is constituted by a displacement drive amount detection means for detecting the displacement drive amount of the front position displacement means and a warp tension detection means for detecting the warp tension. Alternatively, a first control function that drives the cloth cloth position displacement means to displace the cloth cloth cloth from the normal position to the cloth side by a predetermined amount in advance during slow reverse rotation, and a second control function for driving the cloth cloth position displacement means to return the cloth cloth cloth to its normal position; and a second control function for driving the cloth cloth cloth position displacement means to return the cloth cloth cloth cloth to the normal position, and determining whether the cloth cloth cloth position displacement is normal or not based on the detected displacement drive amount information obtained from the displacement drive amount detection means. a third control function that determines an abnormality and, in the case of an abnormality, drives the cloth cloth cloth position displacement means to a state that brings about the warp tension immediately before the cloth cloth cloth position displacement starts, which is obtained from the cloth cloth cloth tension detection means; attached to the drive control means.

[0007]

[Operation] The reed is also swung by the slow forward rotation or slow reverse rotation of the loom, and when the front of the woven fabric is in the normal position, the front of the woven fabric is struck by the reed. By shifting the woven fabric from its normal position toward the woven fabric, it is removed from this reeding action position, and the woven fabric will not be struck by the reed. This prevents the occurrence of twill.

[0008] If the position of the cloth cloth is not displaced by a predetermined amount, the displacement drive means reversely operates the cloth cloth position displacement means based on the abnormality information from the displacement drive amount detection means. This reverse operation is carried out until the warp tension obtained from the warp tension detecting means is obtained just before the beginning of the cloth cloth position displacement, and the cloth cloth cloth returns to its normal position.

[0009]

[Example] Hereinafter, an example embodying the present invention is shown in Figs.
This will be explained based on FIG. 21. FIG. 1 schematically shows a side view of the entire loom, M is a machine stand motor, and the machine stand motor M is under the operation control of a control computer C. Reference numeral 1 denotes a feed motor independent from the machine motor M and capable of forward and reverse rotation. A sending motor 1 drives a warp beam 2, and the warp threads T sent out from the warp beam 2 are passed through a heddle 5 and a reed 6 via a back roller 3 and a tension roller 4. The woven fabric W has an expansion bar 7 and a surface roller 8.
, and is wound onto a cross roller 11 via a press roller 9 and a wrinkle removing guide member 10.

The tension roller 4 is the tension lever 1
It is attached to one end of 2, and the tension lever 1
A predetermined tension is applied to the warp threads T by a tension spring 13 attached to the other end of the warp threads T. The tension lever 12 is rotatably supported at one end of the detection lever 14, and a load cell 15 is mounted at the other end of the detection lever 14.
are connected. The warp tension is determined by tension roller 4,
The tension is transmitted to the load cell 15 via the tension lever 12 and the detection lever 14, and the load cell 15 outputs an electric signal to the control computer C according to the warp tension.

The control computer C compares the preset tension with the detected tension determined by the input signal, and sends out the warp beam based on the warp beam diameter determined by the detection signal from the rotary encoder 16 for detecting the rotation angle of the machine. Controls the rotation speed of the motor 1. This controls the warp tension during weaving and prevents the occurrence of weaving steps. The control computer C commands forward rotation of the feed-out motor 1 based on the ON signal from the start switch 17, and changes the rotation speed of the feed-out motor 1 based on the rotation speed detection signal from the rotary encoder 1a built into the feed-out motor 1. feedback control.

The surface roller 8 is operatively connected to a winding motor 18 that is independent of the machine motor M and is capable of forward and reverse rotation, and the control computer C receives a rotational speed detection signal from a rotary encoder 18a built into the winding motor 18. The rotational speed of the winding motor 18 is feedback-controlled based on the following. The control computer C has the woven cloth W1.
An input device 19 for controlling the displacement of the position is connected, and the control computer C performs the cloth cloth position displacement control shown in the flowcharts of FIGS. 7 to 21 based on the displacement control contents inputted by the input device 19. .

The control computer C controls the machine motor M, the feed motor 1, and the take-up motor in response to an abnormality detection signal from the weft insertion error detector 20 and the warp cut detector 21, or an ON signal from the stop switch 22. 18 is ordered to stop operating. As a result, each motor M, 1, 18 is
As shown by curves C1, C2, and C3, the warp feeding and winding of the woven fabric stop, and the reed 6
stops at the position immediately before shinging as shown in FIG. The control computer C stores the detected warp tension F obtained from the load cell 15 at this time.

When the weaving stop signal S1 shown in FIG.
A command is given to the sending motor 1 to perform slow forward rotation of the same amount. That is, when a weaving stop signal S1 related to a weft error is input, the machine motor M is slow reversed by a predetermined amount in order to handle the weft insertion error, and the feed motor 1 is rotated by a predetermined amount Q+.
commands slow forward rotation. This slow forward rotation sends out the warp threads T, reduces the warp thread tension, and
1 moves the woven fabric W from the normal position P by ρ as shown in Figure 3.
Move to the side.

[0015] When a weft insertion error occurs, the weft insertion error is corrected using a weft processing device such as that disclosed in, for example, Japanese Unexamined Patent Publication No. 2-61138. This weft insertion error processing is carried out with the error yarns woven on the woven fabric facing W1 being released from the gripping action of the warp threads T, and the machine table is slowly reversed about one and a half times to release the gripping action. Due to this slow reversal, the reed 6 passes through the normal position P of the woven fabric W1, that is, the reed beating position.

After the weaving cloth position is displaced by the slow forward rotation of the feed-out motor 1 by a predetermined amount, the machine motor M slowly reverses about one and a half times as shown by the curve e1 in FIG. Slowly reverse to the position to form. Due to this slow reversal, the reed 6 moves to the most retracted position as shown by the chain line in FIG. 3, and the warp threads T form the maximum opening. By forming this opening, the erroneous yarns on the woven fabric front W1 are released from the gripping action of the warp threads T, making it possible to perform erroneous weft insertion processing.

In synchronization with the slow reverse rotation of the machine motor M, the feed motor 1 and the take-up motor 18 move along the curves q1 and r1.
Reverse the speed as shown in . Due to the slow reversal of both motors 1 and 18, the warp threads T are slowly pulled back in proportion to the amount of slow reversal of the machine stand, and the woven fabric W is rewinded in proportion to the amount of slow reversal of the machine stand. Due to the synchronous pulling back and synchronous rewinding of the warp threads T and the woven fabric W, the fabric front W1 undergoes a positional displacement corresponding to the slow reversal of the machine base.

[0018] Due to the slow reversal of the machine about one and a half times, the reed 6
While moving from the stop position shown in FIG. 2 to the most retracted position shown by the chain line in FIG. Therefore, when the woven fabric W1 is at the reed beating position P, the woven fabric W1 will be beaten by the reed 6. However, since the woven fabric W1 is missed from the reed beating position P to the woven fabric W side prior to the machine slow reversal in order to handle the weft insertion error, the woven fabric W1 is not struck by the reed 6. Therefore, the weft yarns in the vicinity of the woven fabric W1, which is not tightly woven, will not shift in the vertical direction of the woven fabric W, and twill pillows will not occur due to weft insertion errors.

After the weft insertion error process is completed, the machine motor M slowly reverses as shown by curve e2, and the machine machine slowly reverses to the weaving start position immediately before beating. This is to avoid insufficient beating force at the start of weaving. Even during this slow reversal, the reed 6 passes through the reed beating position P, but since the woven fabric W1 escapes from the reed beating position P, it is not hit by the reed 6, and no twilling occurs.

[0020] The feed motor 1 is synchronized with the machine motor M.
Then, the winding motor 18 slowly reverses as shown by curves q2 and r2. Due to the synchronous slow reversal of both motors 1 and 18, the weaving cloth W1 is pulled back by an amount proportional to the amount of slow reversal of the machine stand to the weaving start position. In order to align the machine frame to the weaving start position, there is also a method in which the machine frame motor M is rotated slowly forward instead of slowly reversely, and in this method, the feed motor 1 and the take-up motor 18 are also rotated slowly in the normal direction.

After the machine base moves slowly in reverse to the weaving start position, the feed motor 1 moves by a predetermined amount Q- as shown in FIG.
Slowly reverses and the warp threads T are slowly pulled back. By this pulling back, the woven fabric W1 is displaced and returned to the normal position P. That is, there is a first control function that drives the feed-out motor 1, which is a cloth cloth position displacement means, in order to displace the cloth cloth cloth W1 from the normal position P toward the cloth W side in advance when the machine table is slowly reversed; The control computer C is provided with a second control function for returning the textile cloth W1 to the normal position P after the reverse rotation is completed.

After Orimae W1 returns to the normal position P,
The control computer C erases the stored detected warp tension F. Then, the machine motor M, the feed motor 1, and the take-up motor 18 synchronously start rotating in the normal direction as shown by curves D1, D2, and D3 in FIG. 4, and weaving is restarted. A weaving stop signal S2 caused by a cause other than a weft insertion error, such as a weaving stop signal input from the warp cut detector 21 or the stop switch 22
is input, the control computer C is prepared for an ON signal input from the starting switch 17, the slow reverse rotation switch 23, or the slow forward rotation switch 24.

[0023] When repairing weave flaws on the woven fabric W, the slow reversal switch 23 is turned on. As shown in FIG. 5, when the ON signal S4 from the slow reverse switch 23 is input, the feed motor 1 is rotated slowly forward by a predetermined amount Q+ prior to the slow reverse rotation of the machine motor M. As a result, Orimae W
1 moves from the normal position P to the woven fabric W side as shown in FIG. 3, and the woven fabric W1 is not struck by the swinging of the reed 6.

After the woven material W1 is released from the beating position P, the machine motor M, the feed motor 1, and the winding motor 1
In response to the ON state of the slow reversal switch 23, the motors 8 perform slow reversal in synchronization as shown by curves e4, q4, and r4. When the slow reverse switch 23 is turned off, the machine motor M, the feed motor 1 and the take-up motor 18 stop operating, and then the feed motor 1 is slowly reversed by a predetermined amount Q-. Due to this slow reversal, the warp threads T are slowly pulled back, and the textile fabric W1 returns to its normal position P. In this way, even during a slow reversal to recover from a wound, Orimae W1
is retracted from the beating action area of the reed 6, and the occurrence of twilling due to interference between the slowly swinging reed 6 and the woven fabric W1 is prevented.

In the repair work, the slow reverse rotation switch 23 is turned ON and OFF for the number of weft yarns that need to be pulled out, and the slow forward rotation switch 24 may also be used for the final positioning of the fabric. be. Slow forward rotation of each motor M, 1, 18 during ON-OFF operation of the slow forward rotation switch 24 shown by curve S5 in FIG. 6 (curve e5,
q5, r5), the movement of the fabric W1 is performed in exactly the same way as when the slow reverse switch 23 is turned on and off.

If the machine stops due to a weft insertion error, the machine automatically reverses to a predetermined weaving start position, but if the machine stops due to a reason other than the weft insertion error, the control computer C is the ON signal S from the start switch 17
3. Reverse the machine to the weaving start position in response to the input. Each motor M, 1, shown by curves e3, q3, r3 in FIG.
Prior to the synchronous slow reversal of step 18, the weaving front W1 is moved in the same manner as described above, and after the slow reversal of the machine frame to the weaving start position, the weaving front W1 is returned to the normal position P. On the way to the weaving start position in a slow reverse direction, the reed 6 passes through the reed beating position P, but the reed W1 escapes from the reed beating position P and is not struck by the reed 6.

Note that the amount by which the woven fabric W1 is released from the normal position P toward the woven fabric W side is set to the minimum necessary amount in accordance with the type of fabric so as to reduce the error when returning the woven fabric. If the displacement of Orimae W1 to prevent the occurrence of twill pillow is not performed normally,
For example, as shown by curve Q in FIG. 4, if the amount of slow forward rotation of the delivery motor 1 does not reach the predetermined amount Q+, the control computer C slowly reverses the delivery motor 1 based on the abnormal rotation information from the rotary encoder 1a. . Due to this slow reversal, the warp threads T are slowly pulled back, and the warp thread tension increases. The warp tension is detected by the load cell 15, and this tension detection information is sent to the control computer C. The control computer C stores the warp tension F immediately before the start of the cloth cloth position displacement, and the slow reversal of the feed-out motor 1 after the cloth cloth cloth position abnormality is performed until the detected tension reaches the stored warp tension F. That is, it determines whether the positional displacement of the weaving cloth is normal or abnormal based on the detected rotation amount information obtained from the rotary encoder 1a, and in the event of an abnormality, the warp tension F obtained from the load cell 15 immediately before the start of the displacement of the cloth cloth cloth is brought about. The control computer C is provided with a third control function for driving the delivery motor 1 to the state shown in FIG.

[0028] The detected tension is the tension F immediately before the start of the woven fabric position displacement.
If it returns to , the woven cloth W1 returns to the normal position P immediately before the beginning of the woven cloth position displacement. After the tension is restored, the control computer C activates the alarm device 25 and does not perform weft insertion error processing. Therefore, the slow reversal of the machine is not performed in order to handle the weft insertion error when the weaving front W1 has not escaped from the swinging area of the reed 6, and the weaving front W1 is not moved due to the abnormal weft front position displacement.
is not struck by the reed 6.

Moreover, by performing tension restoration, the woven fabric W1 returns to the normal position P, so the woven fabric W1
If the starting switch 17 is turned on after manually pulling out and removing the upper error thread, weaving can be restarted by performing the front positioning similar to the case of automatic restart of weaving. That is, even in the event of an abnormality in the positional displacement of the cloth sills, weaving can be restarted without performing extra positioning of the cloth sills.

[0030] Even if an abnormality in the position of the woven cloth occurs when returning the woven cloth after the woven cloth has been normally displaced to the side of the woven fabric W, the tension is restored in the same manner as described above, and the woven cloth is returned to its original position. An alarm is issued that an abnormality in front position displacement has occurred. Even in the event of this abnormal positional displacement of the fabric cloth, by turning on the start switch 17 after the tension is restored, weaving can be resumed without performing extra fabric cloth positioning.

[0031] The reason why the cloth cloth position abnormality occurs, that is, the predetermined slow forward and reverse rotation of the feed motor 1 is not performed is, for example, a control communication error, and the cloth cloth cloth position displacement by feedback control is completed within a predetermined time. This is a case where it is not possible. The slow reversal of the feed motor 1 in the case of tension restoration is feedback control based on tension detection, and the probability that both the feedback control based on tension detection and the feedback control based on the detected rotation amount of motor 1 will be abnormal at the same time is extremely low. Therefore, the tension can be restored normally with extremely high accuracy even when the positional displacement of the woven cloth is not performed normally, and post-processing associated with the occurrence of an abnormality in the positional displacement of the woven cloth can be carried out smoothly.

The present invention is, of course, not limited to the above-mentioned embodiments, and for example, an embodiment in which weaving is restarted by turning on the start switch 17 instead of automatically restarting weaving is also possible. Even in this case, if a warning is given for the abnormal position displacement of the weaving cloth, it is possible to prevent weaving from being restarted with the twill pile still occurring. Furthermore, in the present invention, an embodiment in which the position of the woven cloth is displaced by a winding motor is also possible, and in this case, the position of the woven cloth is displaced toward the woven fabric by increasing the warp tension.

[0033]

[Effects of the Invention] As described in detail above, the present invention allows the weaving cloth to be released from the reeding position to the weaving fabric side in advance when the machine frame is slowly reversed or forwardly rotated. The woven fabric is not struck by the reed passing through the reed beating position during slow forward rotation, and the excellent effect of preventing the occurrence of twilling due to such interference between the reed and the woven fabric is achieved.

[0034] In addition, when an abnormality in the position of the loom occurs, the warp tension is returned to the tension immediately before the start of the loom position, so even if the loom position is not displaced normally, the warp thread tension is is not hit by the reed, and the occurrence of twill can be reliably prevented.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view of the entire loom.

FIG. 2 is a side view of a main part showing the positional relationship between the reed and the fabric front when weaving is stopped.

FIG. 3 is a side view of a main part showing a state in which the woven fabric is removed from the beating position to the woven fabric side.

FIG. 4 is a graph for explaining woven cloth position displacement control.

FIG. 5 is a graph for explaining woven cloth position displacement control.

FIG. 6 is a graph for explaining woven cloth position displacement control.

FIG. 7 is a flowchart representing a woven cloth position displacement control program.

FIG. 8 is a flowchart representing a woven cloth position displacement control program.

FIG. 9 is a flowchart representing a woven cloth position displacement control program.

FIG. 10 is a flowchart representing a woven cloth position displacement control program.

FIG. 11 is a flowchart representing a woven cloth position displacement control program.

FIG. 12 is a flowchart representing a woven cloth position displacement control program.

FIG. 13 is a flowchart representing a woven cloth position displacement control program.

FIG. 14 is a flowchart representing a woven cloth position displacement control program.

FIG. 15 is a flowchart representing a woven cloth position displacement control program.

FIG. 16 is a flowchart representing a woven cloth position displacement control program.

FIG. 17 is a flowchart representing a woven cloth position displacement control program.

FIG. 18 is a flowchart representing a woven cloth position displacement control program.

FIG. 19 is a flowchart representing a woven cloth position displacement control program.

FIG. 20 is a flowchart representing a woven cloth position displacement control program.

FIG. 21 is a flowchart representing a woven cloth position displacement control program.

[Explanation of symbols]

1...Feeding motor 1a constituting the weaving position displacement means
...Rotary encoder as displacement drive amount detection means, 1
5...Load cell as warp tension detection means, C...Control computer as displacement drive control means.

Claims (1)

[Claims] 1. Weaving cloth position displacing means for displacing the weave position of a woven fabric in the warp direction by changing the warp thread tension, and displacement drive control for controlling the displacement drive amount of the cloth cloth cloth cloth cloth position displacing means. a displacement drive amount detection means for detecting the displacement drive amount of the cloth cloth position displacement means, and a warp tension detection means for detecting the warp tension. A first control function that drives the cloth cloth position displacement means in order to displace the cloth cloth cloth from the normal position to the fabric side by a predetermined amount in advance during reversal, and a first control function that drives the cloth cloth cloth cloth cloth cloth cloth after the slow forward rotation or the slow reverse rotation is completed. a second control function for driving the cloth cloth position displacement means to return it to the normal position; and a second control function for determining whether the cloth cloth position displacement is normal or abnormal based on detected displacement drive amount information obtained from the displacement drive amount detection means. and a third control function that drives the weaving cloth position displacement means to a state that brings about the warp tension just before starting the cloth cloth cloth position displacement obtained from the warp tension detection means in the event of an abnormality. A device for preventing the occurrence of weaving steps in a loom provided to the means.