EP0170972A2 - Procédé et dispositif de rattache pour machine de filature à bouts libérés du type à friction - Google Patents

Procédé et dispositif de rattache pour machine de filature à bouts libérés du type à friction Download PDF

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Publication number
EP0170972A2
EP0170972A2 EP85109206A EP85109206A EP0170972A2 EP 0170972 A2 EP0170972 A2 EP 0170972A2 EP 85109206 A EP85109206 A EP 85109206A EP 85109206 A EP85109206 A EP 85109206A EP 0170972 A2 EP0170972 A2 EP 0170972A2
Authority
EP
European Patent Office
Prior art keywords
thread
wedge gap
spinning
bobbin
store
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.)
Granted
Application number
EP85109206A
Other languages
German (de)
English (en)
Other versions
EP0170972B1 (fr
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 Spinnereimaschinenbau AG
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/fr
Publication of EP0170972A3 publication Critical patent/EP0170972A3/de
Application granted granted Critical
Publication of EP0170972B1 publication Critical patent/EP0170972B1/fr
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 an aspirated wedge gap and the thread formed in the wedge gap is drawn off from it and wound onto a spool, with the fiber feed in the spline gap being interrupted and one from the spool for re-spinning withdrawn thread end is guided against the spinning direction to the wedge gap, and a device for performing the method.
  • Open-end friction spinning devices are known in various designs from the prior art.
  • the development in this field has concentrated on devices with rotationally symmetrical friction elements forming a wedge gap or gusset, at least one of which is perforated and provided with a suction insert connected to a suction device (DE-PS 2,449,583; EP-OS 0 031 250; DE-OS 2,714,089).
  • a suction device DE-PS 2,449,583; EP-OS 0 031 250; DE-OS 2,714,089
  • cylindrical, conical or hyperbolic rolls are used and a supplied sliver is broken up into individual fibers by a breakup roll.
  • the fibers fed into the vacuumed wedge gap through a feed channel are rotationally strengthened in the wedge gap by friction and drawn off as yarn from the wedge gap and wound onto a spool. In this way, a yarn can be produced at a high production speed.
  • the industrial use and the economic efficiency of friction spinning are only ensured if the device can be
  • the object of the invention is to provide a method and a device which enables reliable re-spinning of a friction spinning device and thereby gives the piecing point the strength and an inconspicuous appearance necessary for the further processing of the thread.
  • the object is achieved in that the thread end is laid out in front of the wedge gap and at the end of the wedge gap facing away from the bobbin in a piezable Length is stored in a storage station, whereupon the spool of its drive roller is delivered and the thread is withdrawn from the storage station, and that after a predetermined time after the start of thread withdrawal, the fiber feed is resumed in the wedge gap, so that the fibers fed to it by lay the thread end running on the wedge gap and twist it together.
  • 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 pair of draw rollers is unnecessary in that the obtain from the spool Pulled thread end is guided laterally past the pair of draw-off rollers and is held elastically at a distance from the clamping line of the pair of draw-off rollers. 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 fiber band feed and dissolving device and a thread monitor arranged between a pair of take-off rolls and a winding device, is characterized by a bobbin lifting device, a sliver clamping device assigned to the sliver feed device and a thread store arranged in front of the friction elements in the spinning direction.
  • the thread store is preferably designed as a suction tube and a closure member is assigned to it.
  • 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, is made possible in that these devices can be controlled via the thread monitor.
  • Functionally reliable re-spinning of fed fibers to the laid thread end is achieved in that the bobbin lifting device, the fiber sliver clamping device and the closure member of the suction tube and the thread storage device can be controlled according to a time-based program.
  • 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 9 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 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, moreover, the closure member 21 is in the closed position and the closure member 80 is 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 in front of the slit drum formed 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 controlled and opened by the microprocessor 9 so that in the area of the wedge gap there is a negative pressure again.
  • the microprocessor 9 sends 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. If a thread length exceeding the required piecing length has been stored in the thread store 8, 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 t 2 matched to the delivery speed of the piecing device with respect to the start of the coil 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 evenly drawn off.
  • the time from the start to the even withdrawal of the thread can be determined empirically and set.
  • the microprocessor controls the closure member 80 of the thread store 8 after a time t 3 after resetting the sliver clamping device, which is then brought into the closed position.
  • the time t 1 should be such that the coil S comes into contact with the coil drive roller 70 as soon as the full negative pressure on the Friction roller 2 is present.
  • the time t 2 between the start of the bobbin drive and the opening of the sliver clamping device 31 is to be determined such 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 time period t 3 between the opening of the sliver clamping device 31 and the closing of the thread store 8 must accordingly be long.
  • 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 printing roller 60 of the pair of take-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 initial 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 search for 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 in the direction of the closure member 80 is first cut by a knife 52 which is pressed against an anvil 53 in the shield 51, whereupon the free thread end 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 those e.g. are given 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 Procédé et dispositif de rattache pour machine de filature à bouts libérés du type à friction Expired - Lifetime EP0170972B1 (fr)

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 true EP0170972A2 (fr) 1986-02-12
EP0170972A3 EP0170972A3 (en) 1987-06-16
EP0170972B1 EP0170972B1 (fr) 1992-07-08

Family

ID=6242423

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85109206A Expired - Lifetime EP0170972B1 (fr) 1984-08-04 1985-07-23 Procédé et dispositif de rattache pour machine de filature à bouts libérés du type à friction

Country Status (6)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989010990A1 (fr) * 1988-05-03 1989-11-16 Schubert & Salzer Maschinenfabrik Aktiengesellscha Procede et dispositif permettant de commencer une nouvelle filee dans un dispositif de filage open-end

Families Citing this family (5)

* 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 (fr) * 1985-10-31 1991-01-19 Rieter Ag Maschf
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

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2059453A (en) * 1979-09-29 1981-04-23 Schubert & Salzer Maschinen Thread draw-off apparatus and method for initiating thread draw-off in an open-end spinning apparatus
EP0034427A1 (fr) * 1980-02-16 1981-08-26 Hollingsworth (U.K.) Limited Dispositif et procédé de filature à bout libéré
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
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
DE3416456A1 (de) * 1983-05-21 1984-11-22 W. Schlafhorst & Co, 4050 Mönchengladbach 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
GB2158468A (en) * 1984-05-10 1985-11-13 Reiners Verwaltungs Gmbh Piecing on thread in friction spinning machines

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3317369A1 (de) * 1983-05-13 1984-11-15 W. Schlafhorst & Co, 4050 Mönchengladbach Verfahren und vorrichtung zur inbetriebnahme einer friktionsspinnmaschine
CH663428A5 (de) * 1983-05-21 1987-12-15 Schlafhorst & Co W Verfahren und vorrichtung zur inbetriebnahme einer friktionsspinnmaschine.

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2059453A (en) * 1979-09-29 1981-04-23 Schubert & Salzer Maschinen Thread draw-off apparatus and method for initiating thread draw-off in an open-end spinning apparatus
EP0034427A1 (fr) * 1980-02-16 1981-08-26 Hollingsworth (U.K.) Limited Dispositif et procédé de filature à bout libéré
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
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
DE3416456A1 (de) * 1983-05-21 1984-11-22 W. Schlafhorst & Co, 4050 Mönchengladbach 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
GB2158468A (en) * 1984-05-10 1985-11-13 Reiners Verwaltungs Gmbh Piecing on thread in friction spinning machines

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989010990A1 (fr) * 1988-05-03 1989-11-16 Schubert & Salzer Maschinenfabrik Aktiengesellscha Procede et dispositif permettant de commencer une nouvelle filee dans un dispositif de filage open-end

Also Published As

Publication number Publication date
EP0170972B1 (fr) 1992-07-08
EP0170972A3 (en) 1987-06-16
BR8503662A (pt) 1986-05-06
CS567485A3 (en) 1992-02-19
DE3586302D1 (de) 1992-08-13
DE3428890A1 (de) 1986-02-13
CS276713B6 (en) 1992-08-12
IN166178B (fr) 1990-03-24
US4633660A (en) 1987-01-06

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