US3608590A - Optical weft stop motion for a weaving machine - Google Patents

Optical weft stop motion for a weaving machine Download PDF

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Publication number
US3608590A
US3608590A US864690A US3608590DA US3608590A US 3608590 A US3608590 A US 3608590A US 864690 A US864690 A US 864690A US 3608590D A US3608590D A US 3608590DA US 3608590 A US3608590 A US 3608590A
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Prior art keywords
weft
weaving machine
receiver
input
receiving
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US864690A
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English (en)
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Karl Hohener
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Sulzer AG
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Sulzer AG
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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

  • This invention relates to an optical weft stop motion for a weaving machine.
  • optical means in order to detect the presence or absence of weft yarns in weaving machines.
  • such means included a transmitter for emitting a beam of light transversely in the direction of the weft yarn towards a photoelectric cell situated behind the weft. in the event that a weft yarn was present, the beam was interrupted by the weft yarn so that the beam did not reach the photoelectric cell. Thus, the cell did not initiate any switching operations to stop the weaving machine.
  • the invention provides an optical weft stop motion for a weaving machine which is not only capable of monitoring the presence of absence of a weft yarn during a picking operation in order to deactivate the weaving machine in the event of the absence of the weft yarn but also capable of determining the degree of soiling of the optical parts of the stop motion after a picking operation in order to deactivate the weaving machine in the event of excessive soiling.
  • the optical weft stop motion can also determine the presence of a tangled yarn after a picking operation has been completed.
  • the optical weft stop motion includes a transmitter for emitting a beam of light in the direction of the path of a weft yarn and a receiver for receiving the beam.
  • the receiver includes a switching means which causes the weaving machine to stop if no weft yarn is introduced.
  • the switching means also initiates switching operations if the intensity of the beam acting on the receiver drops below a specified value.
  • FIG. 1 illustrates a general view of a weaving machine from the fabric end
  • FIG. 2 illustrates a circuit diagram of a weft yarn stop motion according to the invention.
  • the weaving machine is constructed with two side plates 1, 2 between which are disposed a warp beam (not shown) a cloth beam 3, a guide and tensioning means (not shown) for the warp and fabric, a central member 4 connecting the two side plates 1, 2, and a main drive shaft 5 for the machine.
  • a heddle shaft 6 forming part of a shedding mechanism and a reed 7 are mounted between the side plates 1, 2 as is known.
  • a picking mechanism 8 which projects a shuttle is mounted on the plate 1 while a catching mechanism 9 is disposed on the right-hand side of the machine as shown to receive the shuttle at the end of a picking (or inserting) operation.
  • a weft yarn 10 is drawn from a feed bobbin 11, which is usually fixed outside the shed, through a screen 12 and a vertically movable yam tensioning. device 13 and introduced into the shed as is known.
  • the shuttle After insertion of the weft yarn, the shuttle is pushed back slightly in the catching mechanism 9 so that it has exactly the same position on each pick.
  • the yarn tensioning device 13 is moved into the top position in these conditions, so that the weft yarn always remains tensioned on the reverse movement of the shuttle.
  • yarn brakes (not shown) are used to ensure that the resulting detour at the yarn tensioning device 13 is formed mainly by pulling back the entire inserted weft yarn; where necessary, a length of yarn is also drawn off from the bobbin 11.
  • the weft yarn is cut off at the picking end by shears (not shown).
  • the projecting weft yarn ends on each side of the shed are then tucked into the next shed by a selvedge forming mechanism (not shown) after the reed beat up and shedding.
  • the fabric is then would on the cloth beam 3.
  • the optical weft stop motion includes a transmitter or light source 21 which is mounted in a casing 20 secured to the catching mechanism 9 beneath the picking line, i.e. the path theoretically covered by the shuttle and a photosensitive electric element or photoelectric cell 23 which is mounted in a casing 22 secured to the catching mechanism above the picking line.
  • the transmitter serves to emit a concentrated beam 24 towards the photoelectric cell 23 transversely of the weft.
  • the casing 22 further carries a box 25 containing an electric circuit of the weft stop motion.
  • the electrical circuit of the weft stop motion includes a switching means for stopping the operation of the weaving machine.
  • This circuit includes the photoelectric cell 23 which is connected via a resistor 26 to the input of an amplifier 27.
  • the amplifier 27 is connected to a Schmitt trigger 28 which converts the amplified photoelectric cell voltage signal into a rectangular signal.
  • the Schmitt trigger 28 has two outputs 28a, 28b which carry two voltages having a 180 phase shift. Whenever the Schmitt trigger 28 receives a voltage signal from the photoelectric cell 23 when the latter is fully illuminated, the state of the trigger changes and the phase of the voltage signals at the outputs change.
  • the output 280 of the Schmitt trigger 28 is connected to an input 29a of a NAND gate 29, while the output 28b is connected to an input 30a of a second NAND gate 30.
  • a second input 29b of the gate 29 is connected to a time network 31.
  • the outputs 29c and 300 of the gates 29, 30 lead to a monostable multivibrator 32, whose output 32c is connected via amplifier elements (not shown) to the main switch (not shown) of the weaving machine.
  • Another switch 33 is provided in the switching means and is controlled by the weaving machine main shaft 5. The switch 33, which is normally closed, enables a second input 30b of the gate 30 to be selectively connected to earth or, via a resistor 34, to a positive voltage.
  • the switch 33 In operation, in order to monitor the insertion of a weft yarn, as soon as the shuttle reaches the catching mechanism 9, the switch 33 is opened by the weaving machine main shaft 5. Consequently, the input 30b of the gate 30 is connected via resistor 34 to the positive voltage. However, the phase position of the output voltages of the Schmitt trigger 28 is such that the voltage at output 30a is not sufficient to allow the gate 30 to pass a signal together with the voltage at output 30b. if no weft yarn has been inserted by the shuttle, then there is no weft yarn in the path of the beam of light 24 between the light source 21 and the photoelectric cell 23. The cell 23 is thus fully illuminated and generates a voltage signal which, after amplification in the amplifier 27, actuates the Schmitt trigger 28.
  • the phase of the signal at the input 30a of the gate 30 thus changes so :that it is now sufficient with the voltage at input 301), to enable the gate 30 to pass a signal to the monostable multivibrator 32.
  • the state of the multivibrator 32 thus changes and causes the weaving machine to stop by deactivating the main switch of the machine.
  • the same processes occur if the weft yarn breaks, such breakage usually occurring just behind the shuttle.
  • the weft yarn then forms a small loop near the beam of light, such loop bypassing the beam and acting as if no weft yarn had been inserted.
  • the yarn will be situated in the path of the beam of light 24 so that the beam 24 does not reach the photoelectric cell 23 and the cell 23 does not produce a signal.
  • the state of the Schmitt trigger 28 does not change and the phase of the voltage of the input 300 of the gate 30 does not change.
  • the gate 30 does not pass a signal
  • the multivibrator 32 does not change over and does not initiate any switching operations to stop the weaving machine.
  • the machine then continues to operate and, after being pushed back, the shuttle is ejected from the catching mechanism 9 (FIG. 1) and returned to the picking mechanism 8 (FIG. 1).
  • the weft yarn is cut off followed by the beat up operation, shedding and tucking of the ends into the next shed to form the selvedge.
  • the optical parts of the weft yarn stop motion are at this time checked for soiling as follows:
  • the time network 31 Whenever the switch 33 is opened, the time network 31 is also started, receiving a positive voltage via the resistor 34.
  • the transit time, e.g. 120 milliseconds (msec.), of the time network 31 is longer than the opening time of the switch 33, which closes after the insertion of the weft yarn has been monitored. That is, the transit time, which depends on the speed of operation of the weaving machine, is so long that the above-mentioned time for the optical parts to be checked is reached.
  • the time network 31 delivers a voltage to the input 29b of the gate 29.
  • the Schmitt trigger 28 remains in the position in which the voltage at the output 28a of the trigger 28 and at the input 29a of the gate 29 is sufficient, together with the voltage at the input 29b, to cause the gate 29 to pass a signal to the multivibrator 32.
  • the state of the multivibrator 32 then changes and thus causes the weaving machine to stop as above. Instead of allowing the optical parts to become so dirty that the weaving machine must be stopped, the multivibrator 32 can of course emit a warning signal when there is slight soiling, so that steps can be taken to clean the optical parts.
  • the photoelectric cell 23 passes a signal to the Schmitt trigger 28, the state of which then changes over.
  • the voltage at the input 29a of the gate 29 is now insufficient together with the voltage at the input 2% to open the gate 29 to deliver a signal so that the multivibrator 32 does not change over and the weaving machine continues to operate.
  • the switch 33 is closed, the voltage at the gate input 30b is insufficient with the voltage at the input 30a to cause the gate 30 to pass a signal to the multivibrator 32.
  • the weft yarn stop motion also offers the possibility of monitoring broken weft yarns which, because they are relatively long, remain in the form of a tangle in the scanning zone. If a weft yarn breaks, the part still clamped in the shuttle continues to move towards the catching mechanism 9 and accumulates in the form of a tangle in the region of the beam of light 24. This tangle is still in the region of the beam oflight 24 when the optical parts are checked for dirt.
  • the switching tle e. its interruption of the beam of light as it passes throug the beam can be used to form pulses or a pulse can be generated by induction.
  • An optical weft stop motion for a weaving machine comprising a transmitter for emitting a beam in the direction of a weft;
  • a receiver for receiving the beam said receiver including a switching means having an amplifier for receiving a voltage signal from said receiver, a Schmitt trigger connected to said amplifier for converting said voltage signal into a rectangular signal, a first NAND gate having a first input connected to a first output of said Schmitt trigger and a second input selectively connected to ground or a voltage source, a second NAND gate having a first input connected to a second output of said Schmitt trigger and a second input selectively connected to ground or the voltage source, a switch for selectively connecting said second input of each said NAND gate to ground or the voltage source, a time network connected between said second input of said second NAND gate and said switch, a monostable multivibrator connected to an output of each of said first and second NAND gates for receiving a respective signal therefrom to deactivate a main switch of the weaving machine in response thereto.
  • An optical weft stop motion for a weaving machine comprising a transmitter for emitting a beam in the direction of a weft;
  • a receiver for receiving the beam said receiver including a switching means having a first means for checking for the presence of a weft in the path of the beam during a weft insertion operation, and a second means for checking the beam intensity of the beam from said transmitter to determine the degree of soiling of said receiver or the presence of a tangled weft after a weft insertion operation and for stopping the operation of the weaving machine in response to said receiver receiving a beam from said transmitter of an intensity less than a predeten'nined value in the absence of a weft in the path of the beam after a weft insertion operation.
  • said receiver includes a photoelectric cell to receive said beam and said switching means includes means for determining the intensity of light received on said cell in the absence of a weft in the path of the beam whereby a signal is emitted to stop the operation of the weaving machine in response to the intensity oflight being less than said predetermined value.
  • An optical weft stop motion for a weaving machine comprising a transmitter for emitting a beam oflight
  • a switching means connected to said photocell for selectively stopping the operation of the weaving machine in response to said photocell receiving full illumination from the beam during a picking operation and less than a predetermined value of intensity from the beam after completion of a picking operation.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US864690A 1968-10-10 1969-10-08 Optical weft stop motion for a weaving machine Expired - Lifetime US3608590A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1513468A CH485054A (de) 1968-10-10 1968-10-10 Optischer Schussfadenwächter für eine Webmaschine

Publications (1)

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US3608590A true US3608590A (en) 1971-09-28

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US864690A Expired - Lifetime US3608590A (en) 1968-10-10 1969-10-08 Optical weft stop motion for a weaving machine

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US (1) US3608590A (en:Method)
AT (1) AT295430B (en:Method)
CH (1) CH485054A (en:Method)
CS (1) CS155215B2 (en:Method)
DE (1) DE1934004A1 (en:Method)
FR (1) FR2020278A1 (en:Method)
GB (1) GB1279305A (en:Method)
PL (1) PL80515B1 (en:Method)
RO (1) RO57606A (en:Method)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3802468A (en) * 1972-01-13 1974-04-09 Sulzer Ag Weft monitoring system for a weaving machine and a method of monitoring weft thread
US3824401A (en) * 1971-11-16 1974-07-16 Enshu Seisaku Kk Photoelectric type weft sensing process and weft sensor
US3989068A (en) * 1974-09-28 1976-11-02 Toyo Boseki Kabushiki Kaisha Automatic control apparatus for weaving machine
US4023599A (en) * 1975-03-21 1977-05-17 Sulzer Brothers Limited Opto-electronic weft yarn detector
US4041985A (en) * 1975-05-07 1977-08-16 Nissan Motor Company, Limited Weft sensor system of sensing malfunction of a weaving loom
US4085777A (en) * 1973-07-24 1978-04-25 Vyzkumny A Vyvojovy Ustav Zavodu Vseobecneho Strojirenstvi Arrangement for the control of weft introduced into looms
WO1981002171A1 (en) * 1980-01-31 1981-08-06 Leesona Corp Loom stop motion system and method
US4362190A (en) * 1979-11-07 1982-12-07 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Method of sensing abnormality of weft detecting device in loom
US4476901A (en) * 1982-06-30 1984-10-16 Tsudakoma Corporation Apparatus for detecting weft yarn in jet looms
EP0885991A1 (de) * 1997-04-21 1998-12-23 Lindauer Dornier Gesellschaft M.B.H Verfahren zur Funktionsüberwachung eines Schussfadenwächters in Luftdüsenwebmaschinen
USD959581S1 (en) 2020-08-26 2022-08-02 Parsons Xtreme Golf, LLC Golf club head

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5424502B2 (en:Method) * 1974-05-08 1979-08-21
CH659672A5 (de) * 1982-11-11 1987-02-13 Loepfe Ag Geb Schussfadenwaechter.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3139911A (en) * 1959-09-14 1964-07-07 Breitmeier Max Photoelectric weft detecting means
US3379225A (en) * 1965-05-31 1968-04-23 Toyo Boseki Loom stopping apparatus
US3440634A (en) * 1965-04-14 1969-04-22 Engels Gmbh August System for monitoring moving threads in textile machinery
US3489910A (en) * 1965-02-25 1970-01-13 Sulzer Ag Optical weft thread monitoring apparatus for looms employing multiple reflections of a light beam

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3139911A (en) * 1959-09-14 1964-07-07 Breitmeier Max Photoelectric weft detecting means
US3489910A (en) * 1965-02-25 1970-01-13 Sulzer Ag Optical weft thread monitoring apparatus for looms employing multiple reflections of a light beam
US3440634A (en) * 1965-04-14 1969-04-22 Engels Gmbh August System for monitoring moving threads in textile machinery
US3379225A (en) * 1965-05-31 1968-04-23 Toyo Boseki Loom stopping apparatus

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3824401A (en) * 1971-11-16 1974-07-16 Enshu Seisaku Kk Photoelectric type weft sensing process and weft sensor
US3802468A (en) * 1972-01-13 1974-04-09 Sulzer Ag Weft monitoring system for a weaving machine and a method of monitoring weft thread
US4085777A (en) * 1973-07-24 1978-04-25 Vyzkumny A Vyvojovy Ustav Zavodu Vseobecneho Strojirenstvi Arrangement for the control of weft introduced into looms
US3989068A (en) * 1974-09-28 1976-11-02 Toyo Boseki Kabushiki Kaisha Automatic control apparatus for weaving machine
US4023599A (en) * 1975-03-21 1977-05-17 Sulzer Brothers Limited Opto-electronic weft yarn detector
US4041985A (en) * 1975-05-07 1977-08-16 Nissan Motor Company, Limited Weft sensor system of sensing malfunction of a weaving loom
US4362190A (en) * 1979-11-07 1982-12-07 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Method of sensing abnormality of weft detecting device in loom
WO1981002171A1 (en) * 1980-01-31 1981-08-06 Leesona Corp Loom stop motion system and method
US4326564A (en) * 1980-01-31 1982-04-27 Lessona Corporation Loom stop motion system and method
US4476901A (en) * 1982-06-30 1984-10-16 Tsudakoma Corporation Apparatus for detecting weft yarn in jet looms
EP0885991A1 (de) * 1997-04-21 1998-12-23 Lindauer Dornier Gesellschaft M.B.H Verfahren zur Funktionsüberwachung eines Schussfadenwächters in Luftdüsenwebmaschinen
US6014991A (en) * 1997-04-21 2000-01-18 Lindauer Dornier Gesellschaft Mbh Method of monitoring the function of a stop motion arrangement in an air jet loom
USD959581S1 (en) 2020-08-26 2022-08-02 Parsons Xtreme Golf, LLC Golf club head

Also Published As

Publication number Publication date
CH485054A (de) 1970-01-31
AT295430B (de) 1972-01-10
PL80515B1 (en:Method) 1975-08-30
DE1934004A1 (de) 1970-04-23
DE1934004B2 (en:Method) 1971-01-28
GB1279305A (en) 1972-06-28
CS155215B2 (en:Method) 1974-05-30
FR2020278A1 (en:Method) 1970-07-10
RO57606A (en:Method) 1975-04-15

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