EP0170972B1 - Verfahren und Vorrichtung zum Wiederanspinnen einer Offenend-Friktionsspinnvorrichtung - Google Patents

Verfahren und Vorrichtung zum Wiederanspinnen einer Offenend-Friktionsspinnvorrichtung Download PDF

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Publication number
EP0170972B1
EP0170972B1 EP85109206A EP85109206A EP0170972B1 EP 0170972 B1 EP0170972 B1 EP 0170972B1 EP 85109206 A EP85109206 A EP 85109206A EP 85109206 A EP85109206 A EP 85109206A EP 0170972 B1 EP0170972 B1 EP 0170972B1
Authority
EP
European Patent Office
Prior art keywords
thread
store
nip
piecing
bobbin
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
EP85109206A
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German (de)
English (en)
French (fr)
Other versions
EP0170972A2 (de
EP0170972A3 (en
Inventor
Peter Dr. Dipl.-Ing. Artzt
Gerhard Prof. Dipl.-Ing. Egbers
Hans Dipl.-Ing. Rottmayr (Fh)
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.)
Rieter Ingolstadt GmbH
Original Assignee
Schubert und Salzer Maschinenfabrik AG
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 Schubert und Salzer Maschinenfabrik AG filed Critical Schubert und Salzer Maschinenfabrik AG
Publication of EP0170972A2 publication Critical patent/EP0170972A2/de
Publication of EP0170972A3 publication Critical patent/EP0170972A3/de
Application granted granted Critical
Publication of EP0170972B1 publication Critical patent/EP0170972B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
    • D01H4/48—Piecing arrangements; Control therefor
    • D01H4/52—Piecing arrangements; Control therefor for friction spinning

Definitions

  • the invention relates to a method for re-spinning an open-end friction spinning device, in which fibers are fed into a vacuumed wedge gap and the thread formed in the wedge gap is drawn out of it and wound onto a spool, the fiber feed in the wedge gap being interrupted for re-spinning, and a device for the Implementation of this procedure.
  • the suction effect in the wedge gap is then abolished to varying degrees over the length of the wedge gap, whereby it increases from the end adjacent to the thread take-off tube to the opposite end of the wedge gap. This will make it Pull the end of the yarn from the thread take-off tube to the opposite end of the wedge gap. Then the suction in the wedge gap is completely eliminated, so that the yarn is sucked into the suction nozzle of the feed channel in the direction of the suction channel opposite the thread take-off tube. This allows the yarn to orient itself freely in the feed channel without wave formation.
  • the fiber feeding is interrupted.
  • the predetermined length of the thread is selected so that the end lies in the wedge gap between the ends of the perforated section of the suction roll and does not protrude beyond the ends of the rolls.
  • the fiber feed is resumed essentially at the same time as the suction in the wedge gap is switched on again. Only then will the thread take-off be started again.
  • the attachment of the new yarn to the thread end lying in the wedge gap is critical, since the newly fed-in fibers must have reached the thread end in sufficient numbers precisely when the thread take-off starts again. If the thread take-off starts too early, there may be an unwanted constriction of the thread at the connection point, and if the thread take-off starts too late, there may be an undesired thickening of the thread at the attachment point.
  • the correct period of time is very narrow in this known method, in particular at high working speeds.
  • the thread end is therefore first stored in a storage station at the end of the wedge gap facing away from the bobbin in a pieceable length.
  • the thread is then withdrawn from this storage station and inserted into the wedge gap during the withdrawal.
  • the thread is already in an advantageous translation movement during the insertion process. It is therefore only necessary to synchronize the resumption of the fiber feed with respect to the thread take-off; this then takes place in such a way that the fibers fed in lie against the thread end running through the wedge gap and are twisted together with it.
  • safe re-spinning can take place without constriction or thickening of the thread at the starting point, even at high working speeds.
  • the thread end is laid out in front of a vertically running wedge gap.
  • the thread end is preferably stored in a pneumatic storage station, the suction air flow of which can be used for the laying out. Trouble-free laying close to and along the wedge gap is made possible by the fact that the suction of the wedge gap is interrupted before laying out.
  • the friction elements are cleaned before the thread end is laid out, in that the friction elements are driven in the opposite direction in the spinning direction and the residual fibers detaching from them are sucked into the storage station.
  • a piecing length of the thread end matched to the delivery speed of the spinning device is obtained by storing a measured thread length in the storage station. However, measuring can also be dispensed with if a thread length exceeding a predetermined piecing length is stored in the storage station and the absolute thread end is scanned when the thread is drawn off. In order to prevent the thread from oscillating until it is spun on, the thread end laid out in front of the wedge gap is held elastically at a distance from the thread laying device. A lifting of the pressure roller of the draw-off roller pair is unnecessary in that the thread end drawn off the bobbin is guided laterally past the draw-off roller pair and is held elastically at a distance from the clamping line of the draw-off roller pair. The piecing conditions are further improved in that the thread end is prepared for piecing before being laid out.
  • the device for carrying out the method with two rotationally symmetrical friction elements forming a wedge gap, at least one of which is perforated and connected to a suction device via a suction pipe, a fiber feed device with a sliver feed and dissolving device, and a thread monitor arranged between a pair of take-off rolls and a winding device
  • a bobbin lifting device is characterized in that a thread storage device, which has a closure piece and is under suction, is arranged in the spinning direction in front of the friction elements, that a sliver clamping device assigned to the sliver feed device is provided and that the bobbin lifting device, the sliver clamping device and a suction pipe are used for re-spinning assigned closure member and the closure member of the thread store can be controlled according to a timed program.
  • the thread store is preferably designed as a suction pipe.
  • a rapid and simultaneous actuation of the bobbin lifting device and the sliver clamping device, as well as the opening of the closure member of the thread storage device and the closing of a closure member associated with the suction tube of the friction element in the event of a thread break, are made possible in that these devices can be controlled via the thread monitor.
  • the control is preferably carried out by a microprocessor.
  • the re-spinning of the spinning device with a predetermined piecing length the thread end can be done in a simple manner by assigning a thread scanning device to the thread store. This eliminates the need to measure the thread end before laying out.
  • the thread scanning device is expediently a light barrier.
  • a suction device for residual fibers detached from the friction elements Traversing movements of the laid thread end before re-spinning are prevented by an elastic thread guide element arranged in front of the thread laying device associated with the winding device.
  • the pair of draw-off rollers is expediently assigned an elastic thread-guiding element that keeps the thread away from it, so that it is not necessary to lift the pressure roller of the pair of draw-off rollers.
  • the fact that the friction elements are arranged vertically standing, the laying out of the thread end in front of the wedge gap is significantly favored.
  • the spinning device contains two rotationally symmetrical friction elements in the form of two cylindrical rollers 1 and 2, which are mounted in an upright position and form a wedge gap or gusset.
  • the vertical arrangement of the friction rollers 1 and 2 is preferred because it favors the laying out of the piecing thread, which will be described later, but the friction rollers 1 and 2 can also be arranged in any other position, for example in a horizontal position.
  • At least one of the friction rollers, in the exemplary embodiment the friction roller 2 is perforated and suctioned in the area of the wedge gap during spinning.
  • it is connected to a suction device (not shown) via a suction pipe 20 with a closure member 21, for example a slide or valve.
  • the two friction rollers 1 and 2 are driven in the same direction in a known manner.
  • the friction rollers 1 and 2 are preceded by a fiber feed device, which contains a feed table 3 with a feed roller 30, a dissolving roller 4 and a fiber feed channel 5.
  • a sliver clamping device 31 is arranged above the dining table 3 and in front of the feed roller 30.
  • the yarn is drawn off from the wedge gap between the friction rollers 1 and 2 by a pair of take-off rollers, which consists of a drive roller 6 and a pressure roller 60 pressed against the drive roller 6 by a loading means.
  • the drawn yarn is wound on a spool S which is held in spool arms 7 and is driven by a spool drive roller 70 by friction.
  • the bobbin drive roller is designed as a slit drum and thus simultaneously takes over the thread laying for the bobbin formation.
  • thread laying can for example also by a separate traversing thread guide.
  • the coil S is assigned a coil lifting device 71 with a plunger that can be pressed against the coil arm 7.
  • a thread store 8 is arranged in front of the rolls 1 and 2.
  • the thread store 8 is designed as a suction tube, the suction opening of which protrudes somewhat into the wedge gap formed by the friction rollers 1 and 2 and the other end of which is connected to the suction device with the interposition of a closure member 80.
  • the thread between the draw-off roller pair 6, 60 and the bobbin S is monitored by a thread monitor F, which is located in the vicinity of the draw-off roller pair 6, 60.
  • the thread monitor F is electrically connected to a microprocessor 9, via which the bobbin lifting device 71 and the sliver clamping device 31 as well as the closure members 21 and 80 of the suction line 20 and the thread storage device 8 can be controlled.
  • the microprocessor 9 is also electrically connected to a thread scanning device 81, which is assigned to the thread store 8 and is a light barrier in the exemplary embodiment.
  • the sliver clamping device 31 is at a distance from the feed table 3 and the spool S, which ensures the passage of the sliver to be spun to the feed roller 30 and the opening roller 4, and the spool S is in contact with the spool drive roller 70 (FIG. 1).
  • the closure member 80 for the thread store 8 is closed and the closure member 21 assigned to the suction tube 20 is opened, so that the wedge gap between the rotating friction rollers 1 and 2 is vacuumed.
  • the thread monitor F detects the absence of the thread and sends a signal to the microprocessor 9.
  • the microprocessor 9 then simultaneously gives a control pulse to the bobbin lifting device 71, the sliver clamping device 31 and the closure members 21 and 80, which causes that the bobbin lifting device 71 lifts the bobbin S from the bobbin drive roller 70, the sliver clamping device clamps the sliver on the dining table and also the closure member 21 in the closed position and the closure member 80 in the open position.
  • Mechanisms for moving the devices 31 and 71 and the closure members 21 and 80 are known per se, so that a detailed description is not necessary.
  • the movement of the bobbin lifting device 71 and the sliver clamping device 31 into the lifting position or clamping position and the closing elements into the closing position can be carried out by an electromagnet and the return movement by springs.
  • the spinning device is thus prepared for laying out the piecing thread.
  • the friction rollers 1 and 2 are expediently cleaned beforehand, in particular residual fibers which are still fed into the wedge gap after the fiber band has been clamped, are to be removed therefrom. This can be done in a simple manner by driving the friction rollers 1 and 2 against their direction of rotation for a short time.
  • the rolled-up residual fibers are thereby moved out of the wedge gap and detected by the suction air flow of the thread store 8, which conveys them into the thread store 8 and removes them through it.
  • Other types of cleaning for example mechanically by means of a brush or a yarn end inserted into the wedge gap, are of course also possible.
  • one end of the thread is unwound from the bobbin S and suitably prepared for piecing in a manner known per se, for example by roughening the surface of the thread, in order to increase the success rate when piecing and the strength of the piecer.
  • the end of the thread is then laid out in front of the wedge gap and stored in the thread store 8 for a certain length (FIG. 2).
  • the thread length which must be in the thread store 8, depends on the spinning speed and can be measured accordingly. In order to avoid measuring, however, a thread length exceeding a predetermined piecing length is preferably stored in the thread store 8 and the absolute end of the thread is scanned by the thread scanning device 81 when it is withdrawn from the thread store.
  • a traversing movement of the laid thread should be avoided as much as possible, since this can lead to disturbances during piecing.
  • the thread end is therefore guided when laying over a spring clip 72, which is designed in front of the slit drum Spool drive roller 70 is arranged, and thus kept away from the spool drive roller 70.
  • a spring clip 61 prevents the end of the thread from getting into the nip line of the pair of take-off rollers 6, 60 before piecing when the pressure roller 60 is not lifted off the drive roller 6.
  • the end of the thread is guided past the pair of draw-off rollers 6, 60, placed over the spring clip 61 and threaded into a thread guide 62 with automatic threading.
  • the thread end is then brought into the wedge gap, before which it is laid out with the support of the suction air flow of the thread storage device 8 acting in the wedge gap and sucked into the thread storage device 8, passing through the thread scanning device 81.
  • the piecing program is started, with the closure member 21 of the suction tube 20 being activated and opened by the microprocessor 9 so that in the area of the wedge gap there is a negative pressure again.
  • the microprocessor 9 After a short time t 1 required for opening the closure member 21 (FIG. 3), the microprocessor 9 outputs a control pulse to the coil lifting device 71, which then releases the coil S.
  • the bobbin S comes into frictional contact with the bobbin drive roller 70, as a result of which the laid-out piecing thread starts to be drawn out of the thread store 8.
  • the negative pressure in the thread store 8 exerts a retaining force on the piecing thread so that it is tensioned.
  • the thread tension causes the piecing thread to push the spring clips 61 and 72 away and to run into the clamping line of the pair of draw-off rollers 6, 60 and the thread-laying slot of the bobbin drive roller 70.
  • the absolute thread end of the piecing thread passes the light barrier serving as thread scanning device 81 and previously put into operation, by which the microprocessor 9 is caused to control the sliver clamping device 31.
  • the control takes place after a delay time t2 coordinated with the delivery speed of the piecing device with respect to the start of the spool drive.
  • the sliver clamping device is activated and returned to its starting position as soon as the piecing thread lies taut in the wedge gap and is pulled off evenly.
  • the time from the start to the even withdrawal of the thread can be determined empirically and set.
  • the microprocessor controls after a time t3 after resetting the sliver clamping device, the closure member 80 of the thread store 8, which is then brought into the closed position.
  • the exact dimensioning of the times t1, t2 and t3 is essential for the piecing success as well as the strength and the appearance of the piecing. So the time t1 should be such that the coil S comes into contact with the coil drive roller 70 as soon as the full vacuum on the Friction roller 2 is present.
  • the time t2 between the start of the bobbin drive and the opening of the sliver clamping device 31 is to be determined in such a way that when the fiber is fed into the wedge gap the piecing thread lies taut in the wedge gap.
  • the negative pressure in the thread store 8 must be maintained at least until the piecing thread has been completely removed from the thread store to ensure that the thread is always kept taut when it is pulled off.
  • the period of time t3 between the opening of the sliver clamping device 31 and the closing of the thread store 8 must be correspondingly large.
  • the device according to the invention can be modified in various ways.
  • any other suitable control device can be provided for the time-programmed control of the bobbin lifting device 71, the sliver clamping device 31 and the closure members 21 and 80.
  • the drive of the opening roller 4 can also be interrupted if necessary before the piecing thread is laid out in front of the wedge gap.
  • a safe insertion of the piecing thread into the thread storage device which is neither impaired by the air flow generated by the opening roller nor by the air vortex that occurs when the friction rollers continue to run, can be achieved, for example, by correspondingly dimensioning the negative pressure in the thread storage device.
  • the pressure roller 60 of the pair of draw-off rollers is lifted off the drive roller 6 before the piecing thread is laid out.
  • the spring clip 61 can be omitted in this case.
  • the thread store 8 is arranged in a maintenance carriage W that can be moved along the spinning positions.
  • the thread store 8 is designed here as a hose which is provided with a suction nozzle 83.
  • the suction nozzle 83 is moved by means of a gripper 91 movably mounted on the maintenance carriage W from its starting position in the vicinity of the end of the friction rollers facing away from the take-off roller pair 6, 60 into a position 83 'in front of the bobbin S in order to find the end of the thread on the bobbin. to suck it in and to return the thread length necessary for spinning into the thread store 8.
  • the gripper 91 returns the suction nozzle 83 to its starting position, so that the thread is laid out in front of the wedge gap.
  • the gripper 91 then moves the suction nozzle 83 in the direction of the plane of the wedge gap into a position 83 ′′, as a result of which the thread extending from the bobbin S into the thread store 8 comes to rest in the wedge gap.
  • the coil is in contact with the Spool drive roller 70 brought and thus initiated the thread take-off from the thread store 8.
  • the thread end is also prepared here for piecing.
  • the device 81 ′ required for this is arranged in the thread store 8 in a space-saving manner (FIGS. 4 and 5).
  • the device contains a suction nozzle 50 with a tubular shield 51 connected to the vacuum source.
  • the suction nozzle 50 is designed such that it generates a turbulent suction air flow in the shield.
  • the thread returned to the thread store 8 and extending beyond the shield 51 towards the closure member 80 is first cut in the shield 51 by means of a knife 52 which is pressed against an anvil 53, whereupon the free end of the thread F 'by the turbulent Suction air flow is set in whip-like vibrations.
  • the inner wall of the shield 51 can be provided with edge-like projections, such as are provided by a cord.
  • Other devices for processing the thread end can of course also be used and arranged in the thread store 8.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
EP85109206A 1984-08-04 1985-07-23 Verfahren und Vorrichtung zum Wiederanspinnen einer Offenend-Friktionsspinnvorrichtung Expired - Lifetime EP0170972B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3428890 1984-08-04
DE19843428890 DE3428890A1 (de) 1984-08-04 1984-08-04 Verfahren und vorrichtung zum wiederanspinnen einer offenend-friktionsspinnvorrichtung

Publications (3)

Publication Number Publication Date
EP0170972A2 EP0170972A2 (de) 1986-02-12
EP0170972A3 EP0170972A3 (en) 1987-06-16
EP0170972B1 true EP0170972B1 (de) 1992-07-08

Family

ID=6242423

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85109206A Expired - Lifetime EP0170972B1 (de) 1984-08-04 1985-07-23 Verfahren und Vorrichtung zum Wiederanspinnen einer Offenend-Friktionsspinnvorrichtung

Country Status (6)

Country Link
US (1) US4633660A (cs)
EP (1) EP0170972B1 (cs)
BR (1) BR8503662A (cs)
CS (1) CS276713B6 (cs)
DE (2) DE3428890A1 (cs)
IN (1) IN166178B (cs)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CS256447B1 (en) * 1985-10-09 1988-04-15 Stanislav Didek Device for yarn spinning-in on operating units of friction spinning machine
IN168013B (cs) * 1985-10-31 1991-01-19 Rieter Ag Maschf
DE3814966A1 (de) * 1988-05-03 1989-11-16 Schubert & Salzer Maschinen Verfahren und vorrichtung zum anspinnen einer offenend-spinnvorrichtung
US5414985A (en) * 1991-03-01 1995-05-16 Schubert & Salzer Maschinenfabrik Ag Process and apparatus for piecing a thread in open-end spinning
DE4404538C1 (de) * 1994-02-12 1995-04-27 Rieter Ingolstadt Spinnerei Verfahren und Vorrichtung zum Anspinnen einer Offenend-Spinnvorrichtung
DE19636395B4 (de) * 1996-09-07 2008-01-10 Oerlikon Textile Gmbh & Co. Kg Verfahren und Vorrichtung zum Anspinnen einer Offenend-Spinnstelle nach einem Fadenbruch

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2939706C2 (de) * 1979-09-29 1985-10-03 Schubert & Salzer Maschinenfabrik Ag, 8070 Ingolstadt Verfahren und Vorrichtung zum Einsetzen des Fadenabzuges an einer Offenend-Spinnvorrichtung
EP0034427B2 (en) * 1980-02-16 1989-05-17 Hollingsworth (U.K.) Limited Apparatus and method of open-end spinning yarn
DE3347726A1 (de) * 1983-04-26 1984-10-31 Fritz 7347 Bad Überkingen Stahlecker Oe-friktionsspinnmaschine
DE3315034A1 (de) * 1983-04-26 1984-10-31 Fritz 7347 Bad Überkingen Stahlecker Verfahren und vorrichtung zum anspinnen an einem spinnaggregat einer oe-friktionsspinnmaschine
DE3317369A1 (de) * 1983-05-13 1984-11-15 W. Schlafhorst & Co, 4050 Mönchengladbach Verfahren und vorrichtung zur inbetriebnahme einer friktionsspinnmaschine
DE3318266A1 (de) * 1983-05-19 1984-11-22 Fritz 7347 Bad Überkingen Stahlecker Verfahren und vorrichtung zum anspinnen eines garnes an einem spinnaggregat einer oe-friktionsspinnmaschine
CH663428A5 (de) * 1983-05-21 1987-12-15 Schlafhorst & Co W Verfahren und vorrichtung zur inbetriebnahme einer friktionsspinnmaschine.
DE3416456C2 (de) * 1983-05-21 1994-02-03 Schlafhorst & Co W Verfahren und Vorrichtung zur Inbetriebnahme einer Friktionsspinnmaschine
DE3321234A1 (de) * 1983-06-11 1984-12-13 Fritz 7347 Bad Überkingen Stahlecker Verfahren und vorrichtung zum anspinnen eines garnes an einem spinnaggregat einer oe-friktionsspinnmaschine
DE3325928A1 (de) * 1983-07-19 1985-01-31 Fritz 7347 Bad Überkingen Stahlecker Verfahren und vorrichtung zum anspinnen eines garnes an einem spinnaggregat einer oe-friktionsspinnmaschine
DE3417308A1 (de) * 1984-05-10 1985-11-21 W. Schlafhorst & Co, 4050 Mönchengladbach Verfahren und vorrichtung zum fadenansetzen bei friktionsspinnmaschinen

Also Published As

Publication number Publication date
EP0170972A2 (de) 1986-02-12
EP0170972A3 (en) 1987-06-16
CS276713B6 (en) 1992-08-12
IN166178B (cs) 1990-03-24
CS567485A3 (en) 1992-02-19
BR8503662A (pt) 1986-05-06
US4633660A (en) 1987-01-06
DE3428890A1 (de) 1986-02-13
DE3586302D1 (de) 1992-08-13

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