EP0839939B1 - Verfahren zur Steuerung des Wiederanlaufs einer Webmaschine - Google Patents

Verfahren zur Steuerung des Wiederanlaufs einer Webmaschine Download PDF

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Publication number
EP0839939B1
EP0839939B1 EP97118839A EP97118839A EP0839939B1 EP 0839939 B1 EP0839939 B1 EP 0839939B1 EP 97118839 A EP97118839 A EP 97118839A EP 97118839 A EP97118839 A EP 97118839A EP 0839939 B1 EP0839939 B1 EP 0839939B1
Authority
EP
European Patent Office
Prior art keywords
shedding
weft yarn
loom
size
rotational angle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97118839A
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English (en)
French (fr)
Other versions
EP0839939A1 (de
Inventor
Hitoshi c/o Tsudakoma Kogyo K.K. Morimoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tsudakoma Corp
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Tsudakoma Industrial Co Ltd
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Filing date
Publication date
Application filed by Tsudakoma Industrial Co Ltd filed Critical Tsudakoma Industrial Co Ltd
Publication of EP0839939A1 publication Critical patent/EP0839939A1/de
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Publication of EP0839939B1 publication Critical patent/EP0839939B1/de
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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/002—Avoiding starting marks

Definitions

  • the present invention relates to a method for controlling restart of weaving operation of a loom after the loom is put in a stopped state due to a weft insertion failure, which can prevent an irregular change in the weft yarn density in the vicinity of the cloth fell, and keep filling bar from being formed in fabric.
  • a new weft yarn may be inserted by one pick (hereinafter, one-pick weft yarn insertion). Then, the loom is reset to a specific start state and the weaving operation is restarted.
  • a fabric cannot have a desired specific weft yarn density by beating only at once, but several times of beating are required. Therefore, the weft yarn density varies from rough to tight in the vicinity of the cloth fell as distanced from the cloth fell.
  • the loom is driven in a backward direction in order that a pick finding is conducted. Then, the loom is reset to a start state, and the weaving operation is restarted.
  • a shedding motion is driven in accordance with a regular shedding pattern. Therefore, the shed is formed at the maximum shedding size.
  • the weft yarn density varies from rough to tight in the vicinity of the cloth fell as distanced from the cloth fell, causing the formation of filling bar in the fabric.
  • a filling bar is formed in the fabric due to the following cause.
  • the shed is formed at the maximum shedding size, the warp yarn is in an excessively large tension.
  • a weft yarn inserted prior to the occurrence of the weft insertion failure is moved toward a winding side by being strongly drawed between the upper warp yarn and the lower warp yarn.
  • the present invention is directed to a method for controlling restart of weaving operation of a loom after weaving is stopped due to a weft insertion failure, a defective weft yarn is pick found and removed.
  • the inventive method is characterized by keeping the shedding size smaller than a maximum shedding size of a regular shedding pattern at least during a period from pick finding of a defective weft yarn to first insertion of a weft yarn after restart.
  • the shedding size is controlled to be smaller than a maximum shedding size of a regular shedding pattern at least during a period from pick finding of a defective weft yarn to first insertion of a weft yarn after restart. Accordingly, the density of weft yarn is kept constant, thereby preventing formation of cloth fell in a fabric.
  • a loom includes an electric shedding motion.
  • the shedding motion includes a position indicator 10 and a drive controller 20 which are connected in series.
  • the drive controller 20 controls a driving motor M exclusively used for driving a driving mechanism WM such as a crank mechanism.
  • the driving controller 20 drives the driving motor M in the forward and backward directions so as to operate the heddle frames WF upward and downward through the driving mechanism WM.
  • a plurality of heddle frames are respectively controlled by an independent driving mechanism WM, a driving motor M, a driving controller 20, and a position indicator 10.
  • Only one heddle frame WF is shown.
  • An output of an encoder EN1 is connected to a position indicator 10.
  • the encoder EN1 is connected to a main shaft A of the loom and detects a rotational angle ⁇ of the main shaft A.
  • the main shaft A is connected to a main motor (not shown).
  • a loom starting signal Ss, a loom reverse rotation signal Sc are input through a loom control circuit (not shown).
  • a target rotation amount P 0 is input from the position indicator 10 to the drive controller 20.
  • a rotational amount Pf of the driving motor M detected by an encoder EN2 is also input.
  • the encoder EN2 is connected to the driving motor M.
  • the target rotation amount P 0 and the rotation amount Pf are composed of a train of pulse having a polarity (positive or negative) to represent a rotational direction and a rotational amount of the driving motor M.
  • a rotational angle ⁇ signal is output from the encoder EN1 is input to a step counter 11 in the position indicator 10.
  • the step counter 11 is connected to a shedding pattern setting device 12, and a signal is sent and received therebetween.
  • the output of the shedding pattern setting device 12 is connected to a target rotation amount generator 13.
  • the rotational angle ⁇ signal from the encoder EN1 is input.
  • the output of the target rotation amount generator 13 is connected to the drive controller 20 through a switch 17.
  • the rotational angle ⁇ signal is also input to a correction pattern setting device 14 and a switching signal generator 16.
  • the respective outputs of the shedding pattern setting device 12 and the switching signal generator 16 are connected.
  • the output of the correction pattern 14 is connected to another target rotation amount generator 15.
  • the rotational angle ⁇ signal is input.
  • the output of the target rotation amount generator 15 is connected to the switch 17.
  • the switching signal generator 16 To the switching signal generator 16, another output of the shedding pattern setting device 12 is connected.
  • the loom starting signal Ss and the loom reverse rotation signal Sc are input to the switching signal generator 16.
  • the output of the switching signal generator 16 is connected to the correction pattern setting device 14 and the switch 17.
  • the shedding pattern setting device 12 stores the shedding pattern SKi, and outputs the repeat number Nr of the shedding pattern SKi to the step counter 11.
  • the target rotation amount generator 13 calculates the rotational direction and the rotational amount of the driving motor M required for achieving the shedding pattern SKi provided from the shedding pattern setting device 12, and determines the target rotation amount P 0 1.
  • the target rotation amount P 0 1 is defined by a train of pulse which corresponds to the rotational angle ⁇ of the main shaft A.
  • the target rotation amount generator 13 generates a negatively-polarized pulse train to operate the corresponding heddle frame WF to move downward, and generates a positively-polarized pulse train to operate the heddle frame WF to move upward.
  • the target rotation amount generator 13 outputs a negatively-polarized pulse train and a positively-polarized pulse train as a target rotation amount P 0 1 for operating the heddle frame WF to move upward to form a shed at the maximum upward shedding size Wm and to move downward to form a shed at the maximum downward shedding size -Wm.
  • the moving speed of the heddle frame WF can be controlled by changing the density of the train of the pulse defining the target rotation amount P 0 1.
  • the target rotation amount generator 13 is configured so as not to output the target rotation amount P 0 1 in the period of the other rotational angle ⁇ .
  • the target rotation amount P 0 1 output from the target rotation amount generator 13 is input to the driving controller 20 as a target rotation amount P 0 when the loom is in a normal operation.
  • the switch 17 is switched to be connected to the target rotation amount generator 13 through the switching signal generator 16.
  • the driving controller 20 controls the driving motor M to drive at the rotation amount Pf in correspondence with the target rotation amount P 0 , the heddle frame WF are thereby operated to move upward and downward through the driving mechanism WM.
  • the movement of the heddle frame WF synchronizes with the rotational angle ⁇ of the main shaft A, and a regular shedding motion is produced by the heddle frame WF in accordance with the shedding pattern SKi.
  • a weft filler (not shown) outputs a signal indicating the occurrence of the weft insertion failure.
  • the weft yarn insertion is immediately stopped.
  • the respective heddle frames WFj are operated in accordance with the regular shedding patterns SKij.
  • the shedding pattern setting devices 12, 12 respectively output the reverse information h corresponding to the heddle frames WF1 and WF2.
  • neither of the shedding pattern setting devices 12, 12 output the reverse information h corresponding to the
  • the movement of the heddle frames WF3 and WF4 is not reversed, and they are continuously operated to form the shed at the maximum upward shedding size Wm.
  • the loom control circuit (not shown) generates a loom reverse signal Sc, and the switching signal generator 16 actuates the correction pattern setting device 14 at a specific time in accordance with the presence or absence of the reverse information h provided from the shedding pattern setting device 12. At the same time, the switching signal generator 16 switches the input of the switch 17 from the target rotation amount generator 13 to the target rotation amount generator 15.
  • the switching signal generators 16, 16 which respectively correspond to the heddle frames WF3 and WF4 in Figure 3 actuate the correction pattern setting device 14 at the same time of the generation of the loom reverse signal Sc.
  • the switch 17 is switched.
  • the correction pattern setting device 14 outputs a specific correction pattern SKs to the target rotation amount generator 15.
  • the target rotation amount generator 15 can actuate the corresponding heddle frame WF in accordance with the correction pattern SKs.
  • the target rotation amount generator 15 When the main shaft A of the loom is driven in a backward direction, the target rotation amount generator 15 generates a target rotation amount P 0 2 at the rotational angle ⁇ for driving the driving motor M in accordance with the correction pattern SKs. Then, the target rotation amount generator 15 outputs the target rotation amount P 0 2 as a target rotation amount P 0 to the driving controller 20 through the switch 17.
  • the correction patterns SKs3, SKs4 which respectively correspond to the heddle frames WF3 and WF4 turn into the shedding pattern SKi3 and SKi4 when the operation is stopped.
  • the heddle frames WF1 and WF2 are operated in accordance with the regular shedding pattern Ski1, SKi2 along with the forward and backward rotation of the main shaft A.
  • the heddle frames WF1 and WF2 are operated in accordance with the correction pattern SKs1, SKs2 output from the respective corresponding correction pattern setting device 14.
  • the pick finding of the defective weft yarn can be conducted.
  • the loom is restarted through the loom controlling circuit (not shown).
  • the loom starting signal Ss is input to the switching signal generator 16, while the switching signal generator 16 does not switch the switch 17.
  • the correction pattern setting device 14 is actuated at the rotational angle ⁇ of the main shaft A.
  • the correction pattern setting device 14 is maintained in a driving state until the main shaft A rotates to the rotational angle ⁇ at which the switch 17 is switched.
  • until the main shaft A is rotated to the rotational angle ⁇ ⁇ 200° in the cycle number N 2.
  • the heddle frames WF1 and WF2 are in turn operated in accordance with the regular shedding pattern SKi1, SKi2.
  • the target rotation amount generator 13 is always in the operation state in accordance with the shedding pattern SKi provided from the shedding pattern setting device 12, regardless of the operation of the switching signal generator 16, the correction pattern setting device 14, and the switch 17.
  • the correction patterns SKs3 and SKs4 turn into the shedding pattern SKi3, SKi4, so that the heddle frames WF3 and WF4 are operated in accordance with the shedding pattern SKi3, SKi4.
  • pick finding is conducted automatically or manually and then the defective weft yarn is removed, a weft yarn may be automatically or manually inserted by one pick. After that, the loom is reversed to the restart state. When a weft yarn is inserted by one pick, the weft yarn insertion is inhibited in an initial weft yarn insertion period Tw after restarting the operation.
  • Figure 5 shows a first modification of the construction shown in Figure 2.
  • two target rotation amount generators 13 and 15 are integrated into one target rotational amount generator 13 by disposing the switch 17 on the input side of the target rotational amount generator.
  • the target rotation amount generator 13 When switching the switch 17, the target rotation amount generator 13 generates a target rotation amount P 0 1 or P 0 2 based on either the signal indicating the shedding pattern SKi output from the output pattern setting device 12 or the signal indicating the correction pattern SKs output from the correction pattern setting device 14 by switching the switch 17.
  • the generated target rotation amount P 0 1 or P 0 2 can be output to the driving controller 20 as a target rotation amount P 0 .
  • FIG. 6 shows a second modification.
  • the position indicator 10 may be provided with a base speed calculator 19 for calculating a target base speed Vb of the driving motor M.
  • a rotational speed Va of the main shaft A output from the speed detector 19a is input.
  • the base speed calculator 19 either the shedding pattern SKi output from the shedding pattern setting device 12 or the correction pattern SKs output from the correction pattern setting device 14 is input through the switch 17 which is in the interlocking operation with the switch 17a.
  • the speed detector 19a can detect the rotational speed Va of the main shaft A when the rotational angle ⁇ of the main shaft A is input thereto.
  • the target base speed Vb output from the base speed calculator 19 is introduced to the speed controller 22 in the driving controller 20.
  • the driving controller 20 includes an error detector 21, a speed controller 22, and a current controller 23 connected in series. To the error detector 21, the target rotation amount P 0 and the rotational amount Pf of the driving motor M are input respectively. To the speed controller 22, the rotational speed Vf of the driving motor M is feedback through the speed detector 24. To the current controller 23, the driving current Im of the driving motor M is fedback through the current detector CT.
  • the base speed calculator 19 receives the rotation speed Va of the main shaft A from the speed detector 19a to calculate the target base speed Vb of the driving motor M required for achieving the shedding pattern SKi or the correction pattern SKs in synchronization with the rotational speed Va.
  • the speed controller 22 compares the rotation speed Vf of the driving motor M with the speed indicating value V 0 output from the error detector 21 and the target base speed Vb output from the base speed calculator 19. As a result, the speed controller 22 forms a negative feedback for controlling speed of the driving motor M.
  • the current controller 22 also can form a negative feedback in the same manner.
  • the shedding pattern SKij can be also attained by a manner other than that shown in Figure 3.
  • a shed is in turn being opened upward.
  • the loom is returned in a normal operation mode in accordance with the shedding pattern SKi1.
  • a weft yarn is inserted in a regular manner in the initial period Tw after the operation is restarted.
  • the normal weft yarn insertion is omitted in the initial period Tw.
  • the shedding pattern SKij can be attained by still another manner depending on the fabric to be manufactured, as shown in Figure 8.
  • a new weft yarn W3 is inserted by one pick (3) in Figure 8 and the upper warp yarn Wa and the lower warp yarn Wb (hereinafter, referred to the lower warp yarn) are crossed each other (4) in Figure 8 to accommodate the inserted weft yarn therebetween.
  • reference numerals W2, W2... indicate weft yarns inserted prior to the occurrence of the weft insertion failure.
  • a weft yarn W3 is inserted by one pick in the space between the upper warp yarn Wa and the lower warp yarn Wb.
  • the weft yarn W3 inserted by one pick is never unexpectedly loosened. As a result, there is no fear of generating a filling bar.
  • each heddle frame WF is driven in accordance with the correction pattern SKs.
  • ⁇ Wm in the initial period Tw in which a weft yarn is inserted after restarting the operation, as is step of the pick finding of the defective weft yarn W where the shed is formed at the shedding size W
  • the operation shown in Figure 8 can be attained by adding a pulse generator 18 and an OR-gate 18a to the position indicator 10 (see Figure 9).
  • a data indicating the shedding pattern SKi is input from the shedding pattern setting device 12, and also a signal Sa indicating a pick finding (hereinafter, referred to as "pick finding signal Sa") and a signal Sb indicating to hold the weft yarn (hereinafter, referred to as "hold indicating signal Sb”) are input.
  • the output of the pulse generator 18 is connected to the OR-gate 18a.
  • the OR-gate 18a is connected to the output of the switch 17.
  • the pick finding signal Sa is generated and is input to the pulse generator 18.
  • the pulse generator 18 Upon receiving the pick finding signal Sa, the pulse generator 18 generates a target rotational amount P 0 3 referring to the shedding pattern SKi.
  • the switch 17 is switched to a neutral position through the switching signal generator 16.
  • the hold indicating signal Sb is generated and is input to the pulse generator 18.
  • the pulse generator 18 receives the hold indicating signal Sb, the corresponding heddle frame WF is operated to close the shed.
  • the weaving operation can be restarted without inserting a weft yarn by one pick prior to restarting the operation.
  • the main shaft A is also put in a stopped state and only the shedding motion is maintained to drive, so that the pick finding of the defective weft yarn W1 is conducted and the defective weft yarn W1 is removed (1) and (2) in Figure 8.
  • ⁇ Wm without reaching the maximum shedding size W Wm.
  • the weaving operation is restarted.
  • equivalent to the value W
  • of the regular shedding pattern SKi in the cycle number N Ns+1
  • the shedding motion in turn operates the heddle frames WF in accordance with the regular shedding pattern SKi.
  • the shedding motion is controlled to form a shed smaller than a shed formed in a normal operation. Therefore, during this period, a warp yarn is in a remarkably smaller tension than the conventional manner where the shed is formed at a maximum size in accordance with the regular shedding pattern. In this manner, the warp yarn is not in excessively large tension, and therefore, the density of weft yarn is kept constant. Consequently, filling bar is not formed in the fabric.
  • the shedding size is set to a size of about 55 to 97%, and more preferably about 55 to 90%, of the maximum shedding size of the regular shedding pattern. If the shedding size is set to much smaller, a weft yarn cannot be inserted. On the other hand, if the shedding size is set to much larger, the tension of a warp yarn cannot be suppressed to a suitable value.
  • a loom includes an electric shedding motion for operating the heddle frames by a driving motor for exclusive use.
  • the shedding motion By the shedding motion, the shedding size of the shed can be changed whenever necessary. The smaller shedding size is maintained until an initial weft yarn insertion is completed after restarting the operation. Accordingly, filling bar in the fabric can be assuredly prevented.
  • a new weft yarn is inserted by one pick after a defective weft yarn is removed until the weaving operation is restarted.
  • This can eliminate insertion of a weft yarn during an initial insertion period after restart.
  • filling bar in the fabric can be further assuredly prevented.
  • the insertion position of a new weft yarn by one pick can be accurately controlled, unlike inserting of a new weft yarn in the normal operation. This insertion of a new weft yarn before restart can correct the disorder of the cloth fell caused due to operation stop, reverse movement, and operation restart.
  • the shed is kept in a constant size smaller than the maximum size of the regular shedding pattern at least during a period from pick finding of a defective weft yarn to first insertion of a weft yarn after restart. During this constant period, any drive of the heddle frames of the shedding motion will not be required.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)

Claims (3)

  1. Verfahren zur Steuerung bzw. Regelung des Wiederanlaufs eines Webvorgangs einer Webmaschine nach einem Herausfinden eines Einschußfadens und Entfernen eines schadhaften Schußgarns, gekennzeichnet durch ein Halten der Fachbildungsgröße bzw. Abwurfgröße (W) kleiner als eine maximale Fachbildungsgröße (Wm) eines regelmäßigen Fachbildungsmusters während wenigstens eines Zeitraums bzw. Periode vom Herausfinden des Einschußfadens eines schadhaften Schußgarns bis zum ersten Einsetzen eines Schußgarns nach Wiederanlauf, wodurch die Fachbildungsgröße durch Steuern bzw. Regeln der Fachbildungsbewegung des Webstuhls gebildet wird.
  2. Verfahren zur Steuerung bzw. Regelung des Wiederanlaufs eines Webvorgangs nach Anspruch 1, worin das schadhafte Schußgarn entfernt wird und ein neues Schußgarn durch einen Einschußfaden vor dem Wiederanlauf des Webvorgangs eingefügt wird.
  3. Verfahren zur Steuerung bzw. Regelung des Wiederanlaufs eines Webvorgangs nach Anspruch 1 oder 2, worin die Fachbildungsgröße (W) konstant wenigstens während eines Zeitraums bzw. Periode vom Herausfinden des Einschußfadens eines schadhaften Schußgarns bis zum ersten Einsetzen eines Schußgarns nach dem Wiederanlauf gehalten wird.
EP97118839A 1996-10-29 1997-10-29 Verfahren zur Steuerung des Wiederanlaufs einer Webmaschine Expired - Lifetime EP0839939B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP28681996 1996-10-29
JP286819/96 1996-10-29
JP28681996A JP3361241B2 (ja) 1996-10-29 1996-10-29 織機の再起動制御方法

Publications (2)

Publication Number Publication Date
EP0839939A1 EP0839939A1 (de) 1998-05-06
EP0839939B1 true EP0839939B1 (de) 2002-02-20

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EP97118839A Expired - Lifetime EP0839939B1 (de) 1996-10-29 1997-10-29 Verfahren zur Steuerung des Wiederanlaufs einer Webmaschine

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EP (1) EP0839939B1 (de)
JP (1) JP3361241B2 (de)
DE (1) DE69710552T2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101082148B (zh) * 2006-06-02 2011-01-26 津田驹工业株式会社 织机的误运转防止装置
WO2016015674A1 (zh) * 2014-08-01 2016-02-04 江苏友诚数控科技有限公司 数控找纬机构

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10053079C1 (de) 2000-10-26 2002-05-29 Dornier Gmbh Lindauer Verfahren zum Betreiben einer Web- und Fachbildemaschine
CN104153108B (zh) * 2013-11-20 2015-09-30 江苏友诚数控科技有限公司 一种织机找纬机构
CN105297236B (zh) * 2015-10-30 2017-03-22 浙江康立自控科技有限公司 织机反向找纬控制方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4480665A (en) * 1981-01-21 1984-11-06 Nissan Motor Company, Limited Weft-bar (set mark) prevention system for a loom
FR2583435B1 (fr) * 1985-06-14 1987-09-18 Picanol Nv Procede et dispositif d'extraction de fils de trame defectueux d'un metier a tisser sans navette
CH668997A5 (en) * 1985-12-16 1989-02-15 Zellweger Uster Ag Re-start working parameter control - for weaving loom by warp tension sensor and microcomputer with memory
DE3642913C2 (de) * 1986-12-16 1995-09-14 Kaiser Gmbh & Co Kg Verfahren zur Steuerung einer Webmaschine und Webmaschine zur Durchführung des Verfahrens
EP0629725A1 (de) * 1993-06-15 1994-12-21 Sulzer RàœTi Ag Verfahren zum Starten einer Webmaschine und Webmaschine zur Durchführung des Verfahrens

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101082148B (zh) * 2006-06-02 2011-01-26 津田驹工业株式会社 织机的误运转防止装置
WO2016015674A1 (zh) * 2014-08-01 2016-02-04 江苏友诚数控科技有限公司 数控找纬机构

Also Published As

Publication number Publication date
DE69710552T2 (de) 2002-10-10
JPH10130998A (ja) 1998-05-19
DE69710552D1 (de) 2002-03-28
JP3361241B2 (ja) 2003-01-07
EP0839939A1 (de) 1998-05-06

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