EP0500498A1 - Apparatus for displaying weft detecting result in a jet loom - Google Patents

Apparatus for displaying weft detecting result in a jet loom Download PDF

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Publication number
EP0500498A1
EP0500498A1 EP92810108A EP92810108A EP0500498A1 EP 0500498 A1 EP0500498 A1 EP 0500498A1 EP 92810108 A EP92810108 A EP 92810108A EP 92810108 A EP92810108 A EP 92810108A EP 0500498 A1 EP0500498 A1 EP 0500498A1
Authority
EP
European Patent Office
Prior art keywords
weft
pulse signals
detecting
displaying
signals generated
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.)
Withdrawn
Application number
EP92810108A
Other languages
German (de)
English (en)
French (fr)
Inventor
Kazuharu c/o Kabushiki Kaisha Toyoda Ohta
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.)
Toyota Industries Corp
Original Assignee
Toyoda Jidoshokki Seisakusho KK
Toyoda Automatic Loom Works Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toyoda Jidoshokki Seisakusho KK, Toyoda Automatic Loom Works Ltd filed Critical Toyoda Jidoshokki Seisakusho KK
Publication of EP0500498A1 publication Critical patent/EP0500498A1/en
Withdrawn legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/18—Automatic stop motions
    • D03D51/34—Weft stop motions

Definitions

  • the present invention relates to an apparatus in a jet loom for detecting a weft and displaying the result of said weft detection.
  • a weft detector of photoelectric type is used for detectong the presence of a weft inserted by air jet in an jet loom.
  • This type of weft detector is disclosed by Publication of the unexamined Japanese Patent Application No. 61-239059 (1986).
  • This weft detector is adapted to emit light against a weft and receive light reflected therefrom thereby to sense the variation in the amount of the reflected light for transmitting a pulse signal when the magnitude of an electrical signal produced according to the variation is greater than a predetermined value.
  • Such conversion of a electrical signal into a pulse signal is made for the purpose of distinguishing a weft from foreign matters such as fly.
  • the number of pulse signals generated when a weft is detected is so different from the number of pulse signals produced when fly is detected that the comparison of the number of pulse signal generated from the detection by the weft detector with a predetermined number can make it possible to distinguish a weft from fly.
  • the number of pulse signals to be thus produced varies noticeably depending on the kind, count number, color, etc. of a weft to be detected, as well as on the arrival time at which the leading end of an inserted weft reaches a predetermined terminating extremity position in the weft insertion passage across the loom. Therefore, setup adjustment of a reference number of pulse signals to be compared with variable numbers of pulse signals generated from weft detection is a very complicated and time-consuming procedure.
  • the reference number of pulse signals is set too large, a weft tends to fail to be detected properly in spite that there actually exists a weft. If the reference signal number is set to small, on the other hand, the tendency of a tongue being detected in spite that there actually exists no such weft is increased. Such errors in weft detection will invite downtime in production operation due to frequent unnecessary stops of the loom if the reference pulse signal number is too large, or idle weaving operation, i.e. the loom being in weaving motion without insertion of a weft if the reference number is too small.
  • an object of the present invention is to provide an apparatus in a jet loom which can permit easy and optimum setup adjustment of reference pulse signal number for comparison with the number of pulse signals generated from weft detection.
  • the present invention provides an apparatus for displaying weft detecting result in a jet loom comprising photoelectrically-operated means for detecting a weft, said weft detecting means being adapted to generate electrical signals in accordance with a change in the amount of light received by the detecting means, comparator and converter means for comparing the electrical signals generated by the photoelectrical weft detecting means with a threshold valve and then converting the electrical signals into pulse signals according to the comparison, counting means for counting the number of pulse signals generated by the comparator and converter means during a predetermined period of time in one complete weft insertion cycle for each weft pick, and display means fordisplaying a value indicating the number of pulse signals counted by the counting means.
  • Pulse signals generated by the comparator and converter means are counted for each weft pick, or counted alternatively as an average number for one pick by counting such pulse signals of a plurality of weft picks.
  • the number of pulse signals thus counted is shown on the display means.
  • the pulse signal number can be shown only while the loom is at a stop or constantly, as required.
  • the number on display can be used as a reference aid in setting a reference pulse signal number for comparison with the number of pulse signals produced from weft detection.
  • FIGS. 1 to 6 show the following:
  • Each of wefts Y 1 , Y 2 flown from main weft inserting nozzles 1A, 1B, respectively, by air jets injected therefrom is assisted in flying through a warp shed by relayed air jets issued from a plurality of auxiliary nozzles 2, 3, 4, 5. If the weft insertion is done properly, the leading end of each inserted weft Y 1 , Y 2 is detected by a weft detector 6 of photoelectric reflection type which is disposed at a predetermined extremity position for weft detection in the weft travelling passage.
  • the weft detector 6 emits light against the leading end of the inserted weft moving therepast and receives light reflected therefrom for generating electrical signals in accordance with the amount of light received.
  • the electrical signals are transmitted to a comparator and converter circuit 9 through an amplifier circuit 7 and a filter circuit 8.
  • the curved line S 1 shown in FIG. 4 represents input electrical signal to the comparator and converter circuit 9.
  • the comparator and converter circuit 9 compares the in put signal S 1 with a threshold value "d" indicated by straight line D in FIG. 4 and converts those portions of the signals S 1 which exceed the threshold value "d” into pulse signals S 2 shown in FIG. 4.
  • the comparator and converter circuit 9 is connected to an AND circuit 10 which finds a logical product of the pulse signals S 2 inputted thereto by the comparator and converter circuit 10 and a weft detection time signal S 3 provided by a weft detection time signal generator circuit 11 connected at its output to the AND circuit 10.
  • the signals S 4 shown in FIG. 4 represent pulse signals generated by the AND circuit 10.
  • the computer congrol C 1 has connected thereto an imput device 12 for inputting reference values Z i (wherein i: 1, 2) and a display device 13 selectably displaying input mode screen G 2 shown in FIG. 2 and detection mode screen G 2 shown in FIG. 3 depending on the position of a mode selector switch (not shown) provided on the display device 12.
  • the input mode screen G 1 is selected in inputting the reference values Z 1
  • the detection mode screen G 2 is used to display the number of pulse signals N i p transmitted from the AND circuit 10 to the computer control C 1 .
  • Injection of air from the main weft inserting nozzles 1A, 1B is controlled by a solenoid-operated valves V 1 , V 2
  • while injection of air from the auxiliary weft inserting nozzles 2-5 is controlled by similar solenoid-operated valves V 3 , V 4 , V 5 , V s .
  • air injection from each nozzle takes place when the solenoid of its associated valve is being energized, thereby opening the valve, and the air injection is stopped when the same solenoid is deenergized, thereby closing the valve.
  • the valves V 1 , V 2 are connected to air tanks 14, 15 for holding therein air under pressure, respectively, and the valves V 3 -V 6 are connected to a common air tank 16.
  • These air tanks 14, 15, 16, are in turn connected to a main air tank 20 for holding therein source air under pressure via electricallyoperated air pressure control valves 17, 18, 19, respectively.
  • the solenoid-operated valves V 1 -V 6 are actuated to open or close in response to a command from the control c. which provides such command in response to signals transmitted from a rotary encoder 21 monitoring the current angle of rotation of the weaving loom.
  • pressure detectors 22, 23, 24 which are connected at their input to the air tanks 14, 15, 16, respectively, for detecting the air pressures in these tanks, and at their output to a computer control C 2 for transmitting thereto information of detected air pressures.
  • the control C 2 thus provides a feedback control of the pressure control valves 17, 18, 19 with the aid of the information of the current air pressures detected by the pressure detectors 22, 23, 24.
  • COLOR1 on the screen represents the weft Y 1 released from the main inserting nozzle 1A and COLOR2 the weft Y 2 released from the other nozzle 1 B, respectively.
  • Z 1 indicates a reference number of pulse signals set for the weft Y 1 and Z 2 a similar reference number set for the weft Y 2 .
  • These reference pulse signal numbers Z 1 , Z 2 can be set by inputting them from the input device 12 with the screen shown in its input mode selected by the above selector switch.
  • FIGS. 5 and 6 provide a flow chart showing the weft detection display program according to which the computer control C 1 performs its function of displaying the pulse signals generated from weft detection.
  • the computer control C 1 counts the number high-level signals generated by the AND circuit 10, i.e. the number N i p of the pulse signals S 4 .
  • the control C 1 calculates to find an average value ⁇ N i P>, or the average number of pulse signals counted for one pick, from the pulse signals countd during "M" times of weft picks.
  • This average value ⁇ N i P> can be expressed by the equation (1) shown below.
  • the control C 1 provides this calculated average valve ⁇ N i P> to the display device 13. If the display device 13 is then set for its detection mode screen G 2 as shown in FIG. 3 with the selector switch so placed, the display device 13 shows on the screen G 2 this average value ⁇ N i P>.
  • N 1 on the detect mode screen G 2 represents the average number of counted pulse signals for the weft Y 1 and N 2 the average number of counted pulse signals for the weft Y 2 .
  • the control C 1 keeps ⁇ N i p> to be displayed continuously on the display device 13.
  • a loom operator can change the reference number Z i while having reference to the value ⁇ N i p> of actually counted pulse signals then displayed on the detection mode screen G 2 . This change is made in the input mode with the mode selector switch placed in its input mode position to make the input mode screen G 1 to be displayed.
  • the average value ⁇ N ;P > on the detection mode screen G 2 represents the condition of pulse signal detection just before the loom is stopped. Therefore, comparison between this ⁇ N ;P > on the display value of reference number Z i permits the loom operator to judge whether or not the setting of the latter reference number Z i is appropriate, thus allowing the operator to make proper setting of a new reference pulse signal number on the basis of the actual number of pulse signals generated during the loom operation.
  • Setting of the reference pulse signal number Z 1 through such comparison reflects a change in the kind, count number, color of weft, as well as in the arrival time of the weft leading end at the position defined by the weft detector 6. Thus, setting of an optimum reference pulse signal number Z i for error-free weft detection can be made easily.
  • the computer control C 1 displays the average value ⁇ N i p> by counting the pulse signals generated during "M" times of weft picks in the same manner as described earlier.
  • Changing of the reference pulse signal number Z i for the setup adjustment can be done with the input mode screen G 1 selected on the display device 13 even while the loom is in weaving operation.
  • the average value ⁇ N i p> then displayed can be used as data for reference in changing the Z i setting.
  • Such setup adjustment with the loom in operation is usually performed during the phase of trial weaving operation.
  • the present invention is not limited to the above-described embodiment, but practiced in other ways.
  • an alarm is energized for warning if the average value ⁇ N i p> of counted pulse signal number is decreased gradually.
  • a probable couse of such a decrease in the average value ⁇ N i p> includes a decrease in the working performance of the weft detector 6.
  • warning obtainable from the counted pulse signal can help the operator to acknowledge such a trouble with the weft detector 6.
  • the invention can offer a useful advantage in that setting of an optimum number of pulse signals used for weft detection can be accomplished on the basis of the condition of weft detection during actual weaving operation because the number of pulse signals generated during the weaving operation is displayed and the setting can be made while having reference to the displayed information.
  • the apparatus provides a facilitated setting of reference number of pulse signals for comparison with the number of pulse signals converted from electrical signals generated by a photoelectrically-operated weft detector.
  • Electrical signals generated by the photoelectrically operated weft detector 6 are converted into pulse signals by the comparator and converter circuit 9, and the AND circuit 10 finds a logical product of the above pulse signals and a time signal provided by the weft detection time signal generator circuit 11.
  • the number of high-level signals generated by the AND circuit 10 represents the number of pulse signals generated from weft detection during a predetermined period of time in one cycle of weft insertion, and these pulse signals S 4 are counted by the computer control C 1 for each weft pick.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP92810108A 1991-02-20 1992-02-17 Apparatus for displaying weft detecting result in a jet loom Withdrawn EP0500498A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP26263/91 1991-02-20
JP3026263A JP2611700B2 (ja) 1991-02-20 1991-02-20 ジェットルームにおける緯糸検出表示装置

Publications (1)

Publication Number Publication Date
EP0500498A1 true EP0500498A1 (en) 1992-08-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP92810108A Withdrawn EP0500498A1 (en) 1991-02-20 1992-02-17 Apparatus for displaying weft detecting result in a jet loom

Country Status (2)

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EP (1) EP0500498A1 (ja)
JP (1) JP2611700B2 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102517766A (zh) * 2011-11-14 2012-06-27 威海英卓自动化技术有限公司 一种纺机探纬工作状态的控制显示方法及装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6380434B2 (ja) * 2016-03-16 2018-08-29 株式会社豊田自動織機 ジェットルームにおける緯糸検知方法及び緯糸検知装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2304706A1 (fr) * 1975-03-21 1976-10-15 Sulzer Ag Casse-trame opto-electronique
EP0204093A1 (en) * 1985-04-05 1986-12-10 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho A method and an apparatus for detecting the weft yarn in a jet loom

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54142368A (en) * 1978-04-24 1979-11-06 Tsudakoma Ind Co Ltd Sensitivity setting method and apparatus of detector for weft yarn introducing condition
JPS54147262A (en) * 1978-04-28 1979-11-17 Tsudakoma Ind Co Ltd Method and apparatus for setting sensitivity of detector of warp passing condition

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2304706A1 (fr) * 1975-03-21 1976-10-15 Sulzer Ag Casse-trame opto-electronique
EP0204093A1 (en) * 1985-04-05 1986-12-10 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho A method and an apparatus for detecting the weft yarn in a jet loom

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102517766A (zh) * 2011-11-14 2012-06-27 威海英卓自动化技术有限公司 一种纺机探纬工作状态的控制显示方法及装置
CN102517766B (zh) * 2011-11-14 2013-07-03 威海英卓自动化技术有限公司 一种纺机探纬工作状态的控制显示方法及装置

Also Published As

Publication number Publication date
JPH04272255A (ja) 1992-09-29
JP2611700B2 (ja) 1997-05-21

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