EP0214575B1 - Fangwerk für das Schussfadeneintragsorgan einer Webmaschine - Google Patents

Fangwerk für das Schussfadeneintragsorgan einer Webmaschine Download PDF

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Publication number
EP0214575B1
EP0214575B1 EP86112018A EP86112018A EP0214575B1 EP 0214575 B1 EP0214575 B1 EP 0214575B1 EP 86112018 A EP86112018 A EP 86112018A EP 86112018 A EP86112018 A EP 86112018A EP 0214575 B1 EP0214575 B1 EP 0214575B1
Authority
EP
European Patent Office
Prior art keywords
stopping mechanism
channel
insertion device
stopping
mechanism according
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
EP86112018A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0214575A3 (en
EP0214575A2 (de
Inventor
Simon Goede
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.)
Zellweger Uster AG
Original Assignee
Zellweger Uster AG
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Filing date
Publication date
Application filed by Zellweger Uster AG filed Critical Zellweger Uster AG
Publication of EP0214575A2 publication Critical patent/EP0214575A2/de
Publication of EP0214575A3 publication Critical patent/EP0214575A3/de
Application granted granted Critical
Publication of EP0214575B1 publication Critical patent/EP0214575B1/de
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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
    • D03D49/52—Shuttle boxes
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/12—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein single picks of weft thread are inserted, i.e. with shedding between each pick
    • D03D47/24—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein single picks of weft thread are inserted, i.e. with shedding between each pick by gripper or dummy shuttle

Definitions

  • the invention relates to a catch mechanism for the weft insertion element of a weaving machine, with a braking device for the entry element and with a detection device for determining its position in the catch mechanism.
  • Catching mechanisms of this type are used in particular in rapier projectile weaving machines, where, as is known, there is a constant cycle of a large number of rapier projectiles, all of which are to come to a standstill at approximately the same point. Since the different gripper projectiles of such a circuit have certain differences, the braking device in the operation of the weaving machine has to be constantly adjusted, which takes place on the basis of the position of the gripper projectiles in the catching mechanism determined by the detection device.
  • the invention is now intended to provide a catch mechanism of the type mentioned at the beginning, the detection device of which determines the position of the gripper projectile with high resolution and which can be installed as far as possible from the braking device.
  • the detection device is formed by a sensor which acts on the entry element with electromagnetic radiation in the microwave range and works according to the Doppler principle, and in that the position of the entry element is determined on the basis of the number of zero crossings of the Doppler signal in relation to a sensor Reference position is done.
  • the sensor according to the invention is therefore a type of mini-radar of the type used for traffic monitoring, for example.
  • the superimposition of the radiation reflected by the moving gripper projectile and the emitted radiation creates a low-frequency AC voltage with the so-called Doppler frequency, which undergoes a complete oscillation per half of the waveguide wavelength.
  • the distance between two zero crossings of this AC voltage corresponds to a certain distance of the gripper projectile and one can therefore determine its distance from a reference position and thus also its position by counting the zero crossings. This takes place with a very high resolution and there are also no space problems because there are many degrees of freedom with regard to the arrangement of the microwave sensor.
  • a preferred further development of the catch mechanism according to the invention is characterized in that a reference transmitter, which is acted upon by the microwave radiation, is provided for the reference position, which generates a characteristic Doppler signal that is different from that of the weft insertion element, and that the latter Doppler signal is generated by a sensor that enters or arrives in the catch mechanism in this entry organ is interrupted.
  • the detection device according to the invention not only responds to a moving gripper projectile and determines its rest position, but that the presence of a gripper projectile in the catch mechanism is also indicated.
  • the latter is important because each gripper projectile must first be removed from the trap's channel before the next shot can be fired.
  • the catch mechanism according to the invention thus offers the possibility of simple monitoring of this important function.
  • the single figure shows a schematic representation of a catch mechanism according to the invention and the block diagram of its detection device.
  • a gripper projectile 2 which has pulled a weft thread in the direction of arrow A through a shed, is braked to a complete standstill.
  • the catching mechanism 1 has a channel 3 and a braking device 4 for the gripper projectile 2, the braking device 4 being designed as a brake pad adjustable in the direction of the double arrow P, the brake lining of which forms part of a side wall of the channel 3.
  • the gripper projectile 2 is pushed back into the so-called ejection position by a recoil device 5, in which the thread clamp of the gripper projectile 2 is opened and the gripper projectile 2 is then transferred to a return transport chain.
  • both methods mean that there is no need to readjust the braking device 4 by hand and that not only differences in the individual gripper projectiles but also wear and tear on the brake linings of the braking device 4 are compensated for and corrected. As a result, irregular operating conditions that would damage parts or shutdown the weaving machine are avoided.
  • the position of the gripper projectiles 2 is detected by a sensor in the manner of a miniaturized radar device for monitoring and checking the speed of road vehicles.
  • the channel 3 of the catch mechanism 1, in which the braking device 4 and the recoil device 5 are located is designed as a waveguide for electromagnetic radiation in the microwave range.
  • a microwave module 7, a so-called Doppler transceiver, is arranged in a side arm 6 of the channel 3, the position of which is arbitrary within wide limits and which is arranged, for example, as shown in the figure, between the braking device 4 and the recoil device 5.
  • the microwave module 7 for example a "K-band Doppler transceiver" of the type MA B6857 from Microwave Associates Inc., Burlington, USA, emits an electromagnetic radiation in the microwave range, which reaches the channel 3 through the side arm 6 and finally emerges from the channel 3 on the right-hand end of the catch mechanism 1 in the figure. At this exit, the previously bundled beam is fanned out. A gripper projectile 2 shot through the shed in the direction of arrow A will only reflect a very small proportion of the radiation in channel 3 to the microwave module 7 before it enters channel 3.
  • the radiation reflected by the gripper projectile 2 is received by the microwave module 7 and reaches a mixer 8, preferably a mixing diode, via a receiving switch, where it is superimposed with a small proportion of the radiation emitted by the microwave module 7.
  • the receiving switch and the mixing diode 8 are contained in the microwave module 7, the separate representation of the mixing diode 8 in the figure is done for reasons of clarity. As is known, this superimposition produces a low-frequency AC voltage between the electrodes of the mixing diode, the so-called Doppler signal, whose frequency, the Doppler frequency, is proportional to the speed of the gripper projectile 2.
  • the wavelength of the Doppler signal is thus in a fixed relation to the distance covered by the gripper projectile 2, namely it corresponds to half the value of the so-called waveguide wavelength of the emitted microwave radiation in channel 3, which acts as a waveguide.
  • the distance between two zero crossings of the Doppler signal thus corresponds to a quarter of the Waveguide wavelength.
  • the waveguide wavelength ⁇ g is calculated from the values of ⁇ and A c using the following formula:
  • ferlangeils 2 When determining the rest position of the Grei For the counting of the zero crossings of the Doppler signal, ferlangeils 2 is stipulated that the gripper projectile is to be regarded as completely braked if no zero crossing is registered within a certain period of time.
  • the Doppler signal of the mixer 8 passes via an amplifier 9 to a node 10, from which two evaluation paths A 1 and A 2 lead to a processor 11 which evaluates the Doppler signal.
  • the first evaluation path A which is responsible for the Doppler signal described so far, contains a first filter 12, for example a low-pass filter, which is not permeable to frequencies above the Doppler frequency f D for the maximum speed, an amplifier 13 and a Schmitt trigger 14.
  • another reference position for counting the zero crossings can also be defined, for example the following: Shortly after the entry opening of the channel 3, a side channel 15 opens into the channel 3, in which a reference transmitter 16 is arranged. This reference transmitter sends a signal through the channels 15, 3 and 6 to the sensor 7, which is interrupted at the moment when a gripper projectile 2 covers the mouth of the side channel 16, and which only reaches the sensor 7 again when the gripper projectile 2 is no longer in channel 3. In the event that the gripper projectile 2 does not completely fill the cross section of the channel 3, the signal will not disappear completely, but it will be significantly weakened.
  • the reference transmitter 16 thus not only delivers the desired reference position, but also enables static monitoring of the gripper projectile 2, namely that the absence or the weakening of the signal from the reference transmitter 16 indicates the presence of a gripper projectile 2 in the channel 3.
  • a gripper projectile 2 stuck in the channel 3 can lead to malfunctions especially if it protrudes backwards from it, as in the figure.
  • This case can also be included in the monitoring by selecting the distance between the side channel 15 and the inlet opening of the channel 3 at least as long as the length of a gripper projectile 2. Because then the information "projectile in the channel” only appears when the gripper projectile 2 is fully immersed in channel 3.
  • the reference transmitter 16 which also generates a Doppler signal.
  • a wheel In the side channel 15, a wheel is rotatably mounted, which has projecting blades 17, only one of which projects fully into the side channel 15. If this wheel is now driven in a rotating manner, then it acts on the microwave radiation emitted by the sensor 7 as a modulator, in that each blade 17 immersed in the side channel 15 reflects part of this radiation, as a result of which a Doppler signal is likewise produced at the mixing diode 8.
  • this Doppler signal has a significantly higher frequency than the maximum frequency of the Doppler signal caused by a gripper projectile 2. If the maximum Doppler frequency of the gripper projectile is approximately 15 kHz, then the reference transmitter 16 should generate a Doppler frequency of approximately 25 kHz.
  • the Doppler signal from the reference transmitter 16 arrives in the second evaluation path A 2 because of the blocking effect of the first filter 12 and passes through a second filter 18, an amplifier 19 and a rectifier 20.
  • the second filter 18 is for the frequency in the range from Gripper projectile 2 does not transmit Doppler frequency and is, for example, a high pass filter.
  • the rectifier 20 supplies the processor 11 with a logic "1" as long as there is no gripper projectile 2 between the sensor 7 and the reference transmitter 16; otherwise the input signal of processor 11 on line A 2 is a logic "0".
  • reference transmitter 16 Another possibility of forming the reference transmitter 16 is to form it by means of a small neon tube which, when the connection to the sensor 7 is not covered, generates a characteristic noise therein.
  • microwave radiation of the sensor 7 is not modulated or influenced, but in which the reference position is derived from another transmitter, for example from a light barrier arranged at the inlet opening of the channel 3 or another suitable sensor.
  • the reference transmitter 16 is not required to determine the position of the braked gripper projectile. This is only necessary if further functions of the type described are to be monitored in the trap 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Looms (AREA)
EP86112018A 1985-09-06 1986-08-30 Fangwerk für das Schussfadeneintragsorgan einer Webmaschine Expired - Lifetime EP0214575B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3863/85 1985-09-06
CH3863/85A CH668444A5 (de) 1985-09-06 1985-09-06 Fangwerk fuer das schussfadeneintragsorgan einer webmaschine.

Publications (3)

Publication Number Publication Date
EP0214575A2 EP0214575A2 (de) 1987-03-18
EP0214575A3 EP0214575A3 (en) 1988-05-11
EP0214575B1 true EP0214575B1 (de) 1990-08-16

Family

ID=4265094

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86112018A Expired - Lifetime EP0214575B1 (de) 1985-09-06 1986-08-30 Fangwerk für das Schussfadeneintragsorgan einer Webmaschine

Country Status (5)

Country Link
US (1) US4673003A (ja)
EP (1) EP0214575B1 (ja)
JP (1) JPS6262954A (ja)
CH (1) CH668444A5 (ja)
DE (1) DE3673480D1 (ja)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH679315A5 (en) * 1988-10-03 1992-01-31 Sulzer Ag Projectile loom - has checking mechanism which measures pressure in gap beneath bottom swell with pressure sensor
EP0668383A1 (de) * 1994-02-18 1995-08-23 Sulzer RàœTi Ag Fangbremse und Projektilwebmaschine mit Fangbremse
US5760731A (en) * 1995-12-19 1998-06-02 Fisher Controls International, Inc. Sensors and methods for sensing displacement using radar

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3124166A (en) * 1964-03-10 Shuttle receiving mechanism for gripper shuttle looms
DE1244076B (de) * 1961-06-14 1967-07-06 Sulzer Ag Webmaschine mit Greiferschuetzen
CH469839A (de) * 1968-03-08 1969-03-15 Sulzer Ag Verfahren für den Betrieb einer Webmaschine und Webmaschine zur Durchführung des Verfahrens
CH620481A5 (ja) * 1977-06-01 1980-11-28 Sulzer Ag
CH648614A5 (de) * 1980-12-13 1985-03-29 Loepfe Ag Geb Elektronische steuereinrichtung an einer greiferschuetzenwebmaschine.
EP0108183B1 (de) * 1982-11-08 1986-09-10 GebràœDer Sulzer Aktiengesellschaft Webmaschine

Also Published As

Publication number Publication date
CH668444A5 (de) 1988-12-30
EP0214575A3 (en) 1988-05-11
US4673003A (en) 1987-06-16
EP0214575A2 (de) 1987-03-18
DE3673480D1 (de) 1990-09-20
JPS6262954A (ja) 1987-03-19

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