EP0258248A1 - Procede et dispositif pour rattacher les fils sur une installation de filage a fibres liberees a friction. - Google Patents

Procede et dispositif pour rattacher les fils sur une installation de filage a fibres liberees a friction.

Info

Publication number
EP0258248A1
EP0258248A1 EP86903236A EP86903236A EP0258248A1 EP 0258248 A1 EP0258248 A1 EP 0258248A1 EP 86903236 A EP86903236 A EP 86903236A EP 86903236 A EP86903236 A EP 86903236A EP 0258248 A1 EP0258248 A1 EP 0258248A1
Authority
EP
European Patent Office
Prior art keywords
thread
wedge gap
friction spinning
fibers
insertion slot
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
EP86903236A
Other languages
German (de)
English (en)
Other versions
EP0258248B1 (fr
Inventor
Kurt Lovas
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
Family has litigation
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Application filed by Schubert und Salzer Maschinenfabrik AG filed Critical Schubert und Salzer Maschinenfabrik AG
Publication of EP0258248A1 publication Critical patent/EP0258248A1/fr
Application granted granted Critical
Publication of EP0258248B1 publication Critical patent/EP0258248B1/fr
Expired legal-status Critical Current

Links

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 present invention relates to a method for piecing an open-end friction spinning device, which has two friction spinning elements which are driven in the same direction and form a suction wedge gap, in which a thread end is delivered to a piecing position provided outside the wedge gap and transferred from there into a thread formation zone in the wedge gap where it is drawn off again as a continuous thread with the inclusion of fibers fed to the wedge gap, and a device for carrying out this method.
  • the thread end is returned with the aid of a guide device with the cover open outside the wedge gap into a suction nozzle (DE-OS 3.318.266).
  • a guide device with the cover open outside the wedge gap into a suction nozzle (DE-OS 3.318.266).
  • the device transfers an intermediate section of the thread into the wedge gap of the friction spinning elements which have previously been shut down.
  • the cover is then closed and the thread take-off is switched on.
  • the friction spinning elements are then driven again and the fiber feed is switched on in such a way that the fibers reach the wedge gap at the same time as the thread end. Since the desired delivery quantity does not suddenly get into the wedge gap, but only gradually, a thin spot cannot be avoided following the thread end connected to the fibers. Such a thin point leads to increased thread breakage numbers due to the lower strength.
  • the fiber feed starts before the thread end has been pulled out of the suction nozzle and into the wedge gap, a long, thick-piece piecing is created which is not desired for optical reasons.
  • This object is achieved in that the thread is fed to the wedge gap in such a way that the thread first reaches the thread formation zone with its free thread end, and the feed of the fibers into the wedge gap is controlled such that the thread end simultaneously with the reaching of the Thread formation zone comes into contact with the fibers.
  • the area of the thread that comes into contact with the fibers is therefore quite short. This thread area is now pulled out of the wedge gap and binds in the fibers fed into the wedge gap.
  • the fault is in newly spun thread very short and usually even less than the length of the fiber feed zone, which is determined by the length of the mouth of the fiber feed channel.
  • the thick point in the piecing is even shorter, since not the entire length of the thread returned in the length range of the friction spinning elements reaches the wedge gap, but only the end section of the thread facing away from the take-off side. A thin spot following the piecing can be avoided by timing the insertion of the fiber feed, which can be controlled independently of the thread feed into the wedge gap.
  • the method according to the invention is also intended to include, in the sense of the present invention, such a method in which only the end portion of the returned thread reaches the thread formation zone and the thread region between this end portion and the take-off side End of the wedge gap does not get into the thread formation zone at all.
  • the previous thread end which now forms this intermediate region of the thread, arrives in this region of the wedge gap on the withdrawal side of the thread, ie likewise only later than the thread end for the piecing of the thread formation zone.
  • the invention advantageously provides that the supply of fibers begins in the wedge gap before the thread end has reached the thread formation zone. The thread end is thus placed on the fiber mass collected in the wedge gap, which is now integrated into the thread end together with newly added fibers. In this way, the amount of fibers to be integrated into the piecer can be determined in a simple manner.
  • the procedure according to the invention is such that when a thread break occurs, not only is the fiber supply to the friction spinning elements interrupted, but at the same time the friction spinning elements are stopped, and that during the return of the thread into the piecing position outside the wedge gap, the friction spinning elements are driven again, whereupon the supply of fibers in the wedge gap is released.
  • fibers are briefly supplied to the vacuumed wedge gap in accordance with a preferred embodiment of the method according to the invention when the friction spinning elements are shut down, whereupon the wedge gap is no longer vacuumed and the fibers are sucked out of the wedge gap; the friction spinning elements are then driven again, and the feed of fibers into the wedge gap is released again in a manner that is timed to the previous interruption of the fiber feed.
  • the friction spinning elements are driven at a reduced rotational speed during the feeding of the thread end into the thread formation zone until after the thread take-off is inserted.
  • the thread is fed radially to the wedge gap in such a way that the thread is placed outside the wedge gap on the friction spinning element which rotates into the wedge gap and is fed to the wedge gap by this friction spinning element.
  • the procedure is preferably such that the thread end is placed obliquely on the friction element which rotates into the wedge gap in such a way that the free thread end has a smaller distance from the wedge gap than the thread section located at the end of this friction spinning element on the take-off side.
  • the piecing position is selected so that the thread brought into the piecing position and transferred into the thread-forming zone, before being subjected to a draw-off, only extends into the region of the thread-forming zone to which the fibers are fed. Since the end of the thread does not extend beyond the area to which the fibers are fed at the moment it reaches the thread-forming zone, the fiber feed can also start before the thread to be spun enters the thread-forming zone. This possibility of starter has the advantage that a relatively large period of time is available for the insertion of the fiber feed.
  • the procedure is such that the thread is brought to a defined length in order to return a defined distance outside the wedge gap to the length of the thread formation zone and the thread end is held in this position by clamping, so that fibers are then fed to the wedge gap and then the Thread is placed on the fibers in the wedge gap.
  • the piecing process can be precisely controlled in a simple manner.
  • Thread take-off speed fewer fibers are available for piecing and there is therefore a risk of increased thread breakage during attachment
  • the thread end is clamped with fine threads at a greater distance from the end of the wedge gap on the take-off side than with coarse threads. This means that finer threads are in the wedge gap longer than coarse threads, which means that the differences in the speed relationships between fiber feed and thread take-off are somewhat compensated for during the application.
  • the piecing security is increased.
  • the attachment can take place in such a way that the free thread end reaches the wedge gap while the thread is still held by the clamp. In this way it is ensured that the thread end always reaches the wedge gap earlier than the thread region facing the withdrawal end of the wedge gap. However, it has proven to be particularly advantageous if the thread is released from the fibers in the wedge gap for placing the thread end. This enables precise control with a compact construction of the friction spinning device.
  • An exact insertion of the thread take-off is achieved in an alternative embodiment of the method according to the invention in that the thread is first fed to the wedge gap by means of a clamping point movable in the thread take-off direction and then, without the thread being released by this clamping point, drawn off from the wedge gap by this movable clamping point becomes.
  • the thread drawn off from the wedge gap is expediently passed through the movable clamp to a storage location which compensates for fluctuations in take-off when the take-off is taken over by the take-off device which carries out the normal spinning take-off. In the same way you can also use such a storage location to temporarily store the excess thread lengths when the thread is transferred from the movable clamping point to the bobbin.
  • the thread to be brought into the piecing position is first fed to the wedge gap and then to the storage location by the clamping point movable in the draw-off direction, from where the thread is transferred to a newly inserted empty tube.
  • the thread is fed from the clamping point into the wedge gap by the suction air acting on the friction spinning elements.
  • this thread feed to the wedge gap can be supported by a compressed air stream directed into the wedge gap.
  • the piecing can take place in that the thread is brought to a defined length, by a defined distance outside the wedge gap beyond the end of the thread formation zone facing away from the take-off side, back into the effective range of an elastic retention force in that thereupon fibers are fed to the wedge gap and the thread is drawn against the elastic retention force and, after leaving the effective range of the elastic retention force, is placed on the fibers located in the wedge gap.
  • the thread is placed later on the fibers located in the wedge gap in fine threads than in coarse threads Threads.
  • fibers can be pre-fed over a relatively long period of time, so that enough fibers are available for piecing in spite of the small amount of fibers supplied per unit of time.
  • This can be supported according to the invention in that the thread is only subjected to a delay after reaching the thread formation zone.
  • the open-end friction spinning device has a cover for the friction spinning elements, which has a fiber feed channel and, in addition to the fiber feed channel, a thread insertion slot which extends essentially in the longitudinal direction of the friction spinning elements and which extends from the outside of the cover to the inside thereof and from the end on the extraction side to a maximum of the mouth end of the fiber feed channel facing away from the take-off side is sufficient, a thread holding device holding the thread substantially parallel to the thread insertion slot being arranged outside the wedge gap and a thread guide is also provided which keeps the thread at the take-off end of the friction spinning elements away from the wedge gap as long as the thread end does not keep the wedge gap has reached.
  • the thread insertion slot enables the thread to remain outside the thread formation zone during its return to the piecing position and when the thread is closed
  • Cover from this piecing position can be fed to the thread formation zone.
  • the thread is held parallel to the thread insertion slot by the thread holding device.
  • This thread holding device is arranged and is controlled so that it releases the thread together with a thread guide in such a way that that this first or alone with its free end reaches the thread formation zone, while the thread section between the thread end and the take-off end of the wedge gap decelerates or not at all into the thread 5 . education zone.
  • the thread guide can be designed differently and, under certain circumstances, can also be formed by the thread holding device itself. According to a simple embodiment of the subject matter of the invention, the thread guide 10 is designed as a deflection which deflects the thread leaving the friction spinning elements in the direction of the cover.
  • the thread insertion slot can also be designed differently. Depending on the design of the thread holding device, it may be advantageous if the thread insertion slot, following its area which extends from the outside of the cover to the inside thereof, has an area adjoining it on the side facing away from the take-off side, which is represented by a 20
  • the slot bottom is separated from the inside of the cover, this slot bottom expediently forming an acute angle with the inner wall of the cover. This is particularly expedient if the thread holding device is designed as a suction air nozzle which is inserted into the end of the thread inserting side facing away from the take-off side. Slot opens.
  • This suction air nozzle initially picks up the returned thread and gradually releases it after the thread draw has been inserted, the thread being prevented by a thread guide from reaching 33 the thread formation zone. This is only possible at the end of the thread after being released by the suction air nozzle.
  • the suction air nozzle is arranged in the slot floor. The suction air nozzle expediently opens into the slot bottom parallel to the thread formation zone.
  • the present invention is not tied to a specific design of the thread holding device. According to a preferred embodiment, this is designed as a thread clamp.
  • This thread clamp is advantageously assigned a separating device which gives the thread a defined length and shape.
  • Such an embodiment of the subject matter of the invention is particularly advantageous, in which the thread clamp from a thread take-up position for receiving one of one
  • the movable thread clamp can carry a switch, which is connected to a control device for controlling the
  • the thread clamp is preferably movable along the thread insertion slot, the thread clamp for transferring the thread to the thread insertion slot in the direction of
  • an auxiliary thread is available for spinning.
  • an auxiliary spool is arranged on a maintenance carriage which can be moved along a plurality of open-end friction spinning devices, from which the thread can be fed to the thread clamp.
  • the thread clamp itself can fetch the thread length required for piecing; however, a separate feed device can also be provided for this purpose, and depending on the design of the device, the thread extending to the auxiliary bobbin can also be severed between the auxiliary bobbin and the thread clamp during each piecing process.
  • To assist the insertion of the thread into the thread insertion slot may be assigned to both a stationary and a movable thread clamp a directed into the thread insertion slot compressed air nozzle, which blows the yarn 1 into the yarn insertion slot.
  • the fiber feed channel opens into the wedge gap, while the thread insertion slot opens outside the wedge gap opposite the circumferential surface of the friction spinning element turning into the wedge gap.
  • the end of the thread insertion slot on the take-off side is at a greater distance from the thread-forming zone than the end of the thread-forming zone facing away from the take-off side.
  • the thread insertion slot includes an angle of inclination of less than 90 with the direction of rotation of the friction spinning element which rotates into the wedge gap.
  • a rapid insertion of the thread into the thread insertion slot is achieved according to the invention in that the thread insertion slot widens towards the outside of the cover. This ensures a safe function even with larger movement tolerances.
  • the thread insertion slot can be covered by a controllable closure member.
  • the thread insertion slot is only released for piecing, while it is then covered again for normal spinning.
  • this closure member can be controlled in connection with the other operations of the piecing process from a maintenance carriage which can be moved along a plurality of open-end friction spinning devices.
  • the thread take-off can be adapted to the respective spinning conditions by the thread take-off being decelerated and / or driven at a reduced speed.
  • the thread spinning elements are assigned a thread monitor controlling their drive and an auxiliary drive device which can be controlled by a maintenance carriage which can be moved along a plurality of open-end friction spinning devices.
  • the friction spinning elements according to the present invention remain covered during the entire piecing process. This enables a very. • Individual and variable control of the piecing process, which can be optically adapted to the respective spinning parameters (material, thread thickness, etc.). This enables safe and short piecing to be generated both in connection with thread breakage elimination and in connection with a bobbin change. Despite this optimized control, the device according to the invention is simple and space-saving in construction.
  • FIG. 1 shows a schematic side view of a spinning station designed according to the invention with an open-end friction spinning device and a movable thread clamp
  • FIG. 2 shows a schematic side view of a friction spinning device according to the invention, both with a thread holding device designed as a suction air nozzle and with a thread holding device;
  • Figure 3 is a perspective view of the friction spinning device shown in Figure 2;
  • Figure 4 is a front view of the device shown in Figure 3.
  • Figure 2 shown device with only a thread clamp designed as a thread clamp.
  • FIG. 1 shows an open-end friction spinning device 10, to which the fiber material 3 is fed by means of a feed and dissolving device 2.
  • a draw-off device 4 is provided for pulling off the spun thread 30.
  • the drawn-off yarn is wound by means of a winding device 40 on a spool 400 which can be driven by a winding roller.
  • the open-end friction spinning device 10 is provided together with the feed and dissolving device 2 in a stationary manner at the spinning station 1, of which a large number are usually arranged next to one another in a machine.
  • a maintenance carriage 5 with a piecing device 50 can be moved along these spinning positions 1.
  • the open-end friction spinning device 10 has a housing 13 with two rotationally symmetrical friction spinning elements 100 and 101 (FIG. 3), which form a wedge gap 102. At least one of the friction spinning elements, for example the friction spinning element 101, is perforated and suctioned in the area of the wedge gap 102 during spinning. For this purpose, it is connected to a suction air line 11 via a valve 110 (FIG. 1).
  • each friction spinning element 100 and 101 has a whorl 103, against which a drive belt 120 rests.
  • the drive belt 120 is wrapped around two rollers 121 - only one of which is visible in FIG. 1, so that it is always in a force-locking connection with the host 103 of the two friction spinning elements 100 and 101.
  • On the outside of the drive belt 120 there is a drive roller 122, which receives its drive from a tangential belt 12 which extends over a plurality of spinning stations 1 located one above the other.
  • the drive roller 122 is carried by the armature 600 of a lifting magnet 60, which can be controlled from a control unit 6, and is thus adjustable in the directions of the arrow 8.
  • An auxiliary drive device 54 which is arranged on the maintenance carriage 5, can be delivered to the friction spinning elements 100 and 101.
  • the auxiliary drive device 54 has a controllable drive roller 540 which is driven by a motor 542 via a (indicated) gear 541.
  • the drive roller 540 is seated 'at the end of a longitudinally slidable (arrow Pl) rod 543rd So that the rod 543 can be freely moved during this longitudinal movement, the rod can also be pivoted in the vertical direction about a horizontal axis 544 (arrow P2).
  • the axis 544 is mounted on a bearing block 55, which in turn can be rotated about a vertical axis 51 (arrow P3) in order to be able to bring the auxiliary drive device 54 back from the area of the spinning station 1 to the area of the maintenance carriage 5.
  • the feed and dissolving device 2 arranged upstream of the open-end friction spinning device 10 has a feed hopper 20, by means of which the band-shaped fiber material 3 is fed to a feed roller 21, with which a pressure roller or feed trough (not shown) cooperates in the usual way.
  • the fiber material 3 is fed from the feed roller 21 to a dissolving roller 22, which dissolves the band-shaped fiber material into individual fibers.
  • the opening roller 22 is driven in a known manner by a belt 23.
  • a fiber feed channel 24 extends from the opening roller 22 into the wedge gap 102 of the friction spin elements 100, 101.
  • the thread 30 drawn off by the open-end friction spinning device 10 by means of the draw-off device 4 is monitored on its way to the bobbin 400 driven by a winding roller 401 by a thread monitor 61, which is in control connection with the control unit 6.
  • the piecing device 50 arranged on the maintenance carriage 5 has a suction pipe 500 (arrow P4) which can be pivoted against the spool 400 and by means of which a thread end can be sucked in from the spool 400.
  • the bobbin 400 can be driven in a known manner from the maintenance carriage 5 in the unwinding direction, so that the thread end sucked in getting further into the suction pipe 500.
  • the suction tube 500 has a longitudinal slot (not shown) on its side facing the spinning station 1, so that the thread section sucked in between the slot end facing away from the spool 400 in the vicinity of the pivot axis 501 of the suction tube 500 and the spool 400 can take an elongated course.
  • the thread 30 comes into the swivel range of a controllable thread clamp 70.
  • the thread clamp 70 is part of a thread holding device 7 and is arranged on the free end of an arm 700 which is on the
  • Maintenance carriage 5 is mounted so that it can perform a first pivoting movement in a horizontal plane (arrow P3) about the pivot axis 51 and a second pivoting movement in a vertical plane (arrow P5) about a pivot axis 701.
  • Arm 700 also carries a controllable compressed air nozzle 702.
  • the thread clamp 70 is associated with a pivotable suction tube 52 which is pivotably mounted on a horizontal axis 520, so that it moves from a receiving position in the vicinity of the thread clamp 70 into a transition position in the vicinity of the thread clamp 70
  • Coil 400 can be pivoted in a vertical pivot plane (arrow P6).
  • the suction pipe 52 is connected via a suction line 521 to a vacuum source (not shown).
  • Fig. 4 shows the housing 13 in plan view
  • Fig. 5 shows the housing 13 in a side view. It can be seen from this that the housing 13 has a thread insertion slot 14 in its cover 130 facing the thread clamp 70.
  • This thread insertion slot 14 extends from the outside 131 of the cover 130 to the inside 132 thereof and runs next to the fiber feed channel 24 from the take-off end 133 of the housing 13 to to the mouth end 240 of the fiber feed channel 24 facing away from the withdrawal side (FIG. 3). Since the thread insertion slot 14 is arranged next to the fiber feed channel 24, it opens next to the fiber feed channel 24 and thus outside of the wedge gap 102 opposite the friction spinning element 101 in the interior of the housing 13.
  • the maintenance carriage 5 travels to the relevant spinning station 1 for piecing. This can be due to. of a signal, which the thread monitor 61 triggers when a thread break occurs, or when spinning after a machine standstill, in which the maintenance carriage 5 spins spinning station 1 onto spinning station 1.
  • the suction tube 500 is pivoted about its pivot axis 501 against the coil 400, which was previously lifted off the winding roller 401. While the bobbin 400 is driven from the maintenance carriage 5 by means of an auxiliary drive roller (not shown) in the unwinding direction, the suction pipe 500 takes up the unwound thread 30. Is an adequate one
  • Thread length has been sucked into the suction tube 500, the spool 400 is stopped and the suction tube 500 is pivoted away from the spool 400.
  • the thread 30 emerges from the aforementioned longitudinal slot of the suction pipe 500. It assumes an extended position between the end of the longitudinal slot facing the pivot axis 501 and the coil 400.
  • the thread 30 is thus in the swivel range of the thread clamp 70.
  • the horizontally and vertically pivotable thread clamp 70 is brought into a thread take-up position where it picks up the thread 30. It feeds the thread 30 to a separating device 53 (FIG. 1) provided in the maintenance carriage 5, which cuts the thread 30 on the side of the thread clamp 70 facing away from the bobbin 400.
  • the thread clamp 70 is then pivoted in a combined horizontal and vertical movement to the open-end friction spinning device 10.
  • the thread clamp 70 is in a thread transfer position in front of the thread insertion slot 14 (FIG. 5); the thread clamp 70 thus forms a thread holding device 7, which presents the thread end 300 to the thread insertion slot 14.
  • the thread holding device 7 formed by the thread clamp 70 holds the thread 30 essentially parallel to the thread insertion slot 14.
  • the previously switched off negative pressure is now also applied again to the friction spinning rollers 100, 101 with the aid of the valve 110.
  • the fiber feed is switched on again in a known manner.
  • the fiber sliver now arrives in the form of individual fibers in the wedge gap 102 and is twisted there into a fiber bundle 31 within a thread formation zone 104 (FIG. 5). A real spin does not receive this fiber bundle 31, however, since it can rotate freely in the wedge gap 102.
  • the compressed air in the compressed air nozzle 702 is released so that the thread end 300 is in the same position as the fiber supply in the wedge gap 102 is switched on again
  • Thread insertion slot 14 is blown (Fig. 5). This compressed air thus supports the suction air flow flowing through the suctioned friction spinning element 101.
  • the thread end 300 thus reaches outside of the wedge gap 102 on the suctioned outer surface of the friction spinning element 101. Because of the negative pressure acting on the outer surface, the thread end 300 is carried along by the friction spinning element 101 rotating in the wedge gap 102 and placed on the rotating fiber bundle 31.
  • the fiber bundle 31, which forms a still relatively loose fiber structure, is now screwed into the thread end 300.
  • Wedge gap 102 arrives.
  • the thread area coming into contact with the pre-fed fibers is only short and as a rule even shorter than the thread formation zone 104. This leads to short piecing and thus also to short defects in the newly spun thread.
  • the required strength of the piecer is achieved by relative control of fiber feed, thread feed, speed of the friction spinning elements 100, 101 and insertion of the thread take-off. In this way, a thin point following the attachment point in the thread can also be avoided.
  • the thread 30 which is now forming again is pulled off from the thread formation zone 104 by continuing the movement of the arm 700 with the thread clamp 70, this depending on the piecing speed, fiber material etc. after interrupting the feed and feed movement of the thread holding device 7 or also in a continuous manner this feed and feed movement can happen.
  • the thread holding device 7 also forms a thread guide 75 for the thread 30 and prevents — as mentioned — the end of the thread end 300 on the take-off side from getting into the wedge gap 102.
  • the spool 400 is also lowered back onto the spooling roller 401 in a time-coordinated manner with respect to the processes described.
  • the bobbin 400 thus begins to rotate in the draw-off direction and pull the thread 30 from the open-end friction spinning device 10.
  • the thread clamp 70 is now opened. Voltage fluctuations that occur due to slipping of the coil 400 which is accelerating are absorbed by the suction air flow acting in the suction pipe 52.
  • the suction tube 52 stores the excess thread length until it is used up again by the tension delay when it winds up.
  • the thread 30 gets into the clamping line of the take-off device 4 due to the increasing thread tension, possibly supported by suitable thread guide elements (not shown).
  • the lifting magnet 60 also does this repositioning the drive roller 122 on the drive belt 120, while at the same time the drive roller 540 of the auxiliary drive device 54 releases the drive belt 120 again.
  • the friction spinning elements 100 and 101 are thus driven again by the tangential belt 12 of the machine.
  • the device described with reference to FIG. 1 can also be used in connection with a coil change.
  • the piecing can take place with the aid of auxiliary turns on the empty tube, so that the attachment takes place in the manner described.
  • the piecing and the remaining rest of the auxiliary windings can also be temporarily sucked off with the help of the suction tube 52, whereupon the newly spun thread 30 is transferred to the empty tube with this suction tube 52, which can be done in a known manner with the aid of a catch nose (not shown), etc the winding device 40 can be supported.
  • changing the bobbin is also possible without auxiliary turns on the empty tube. For this purpose, as shown in FIG.
  • an auxiliary spool 32 is seated on the maintenance carriage 5, from which the piecing thread 320 can be pulled off by the thread clamp 70.
  • the piecing thread 320 is guided by the auxiliary bobbin 32 via a thread guide 321 and a thread clamp 322 into the area where the piecing thread 320 can be gripped by the thread clamp 70.
  • the piecing thread 320 is guided by the thread clamp 320 through the separating device 53, where the piecing thread 320 receives the exact piecing length.
  • the piecing takes place as described.
  • the thread clamp 70 is moved in the direction of the winding device 40 in the piecing draw-off up to the area of the mouth 522 of the suction tube 52.
  • the thread clamp 70 is now controlled in such a way that it releases the thread 30 which is now sucked into the suction tube 52.
  • the suction tube 52 is pivoted to the winding device 40, where the thread 30 is transferred to the empty tube.
  • the thread 30 is picked up by the winding device 40, a certain length of thread is pulled out of the suction tube 52.
  • a cutting device 523 In the vicinity of the mouth 522 of the suction tube 52 there is a cutting device 523 which, after the thread 30 has been transferred to the empty tube, cuts off the thread end extending into the suction tube 52.
  • the thread 30 which was previously fed to the suction tube 52 forming a storage location by the thread clamp movable in the take-off direction, was transferred to a newly inserted empty tube in the winding device 40.
  • an alternative embodiment of the piecing process described ensures that the outer surfaces of the friction spinning elements 100 and 101 are freed of residual fibers.
  • fibers are briefly fed to the stopped but suctioned friction spinning elements 100 and 101 even before the thread end 300 reaches the thread insertion slot 14; The fiber feed and the suction of the friction spinning elements 100 and 101 are then set. The fibers are then sucked out of the wedge gap 102. This can be done, for example, by folding the cover 103 away from the rest of the housing 13 with the friction spinning elements 100 and 101 and instead bringing a controllable suction bell (not shown) from the maintenance trolley 5 in front of the friction spinning elements 100, 101.
  • the two friction spinning elements 100, 101 are spread in a manner known per se, so that the fibers can be sucked off by means of a suction device, not shown, which is arranged on the side of the friction spinning elements 100 and 101 facing away from the fiber feed channel 24 is.
  • the temporary supply of fibers results in an increase in the remaining fiber mass in the wedge gap 102, so that suction of the fibers is facilitated.
  • This cleaning of the friction spinning elements 100 and 101 has the effect that the same piecing conditions are always achieved in the wedge gap, regardless of the thread breakage-related residual fibers.
  • the piecing-in fiber is then fed in in a manner that is timed to the previous interruption of the fiber feeding, so that the fiber beard for piecing is always in the same state.
  • the insertion of the thread end 300 into the thread insertion slot 14 should therefore be selected in accordance with the point in time for the piecing fiber feed.
  • the control unit 6, via the lifting magnet 60, causes the drive roller 122 driven by the tangential belt 12 to be separated from the drive belt 120, whereby the latter stops.
  • the friction spinning elements 100 and 101 required for piecing are then carried out from the maintenance carriage 5 via the auxiliary drive device 54.
  • the fiber feed is switched on and the thread end 300 is fed into the wedge gap in the manner described. For easier insertion of the thread end 300 into the thread insertion slot 14, the latter widens in a wedge shape according to FIG. 3 towards the outside 131 of the cover 130.
  • the smallest angular distance p between the thread insertion slot 14 and the thread formation zone 104 is at least 90 °. According to FIG. 3, this angular distance ⁇ between the end on the take-off side of the opening 143 of the thread insertion slot 14 opening on the inside 132 of the cover 130 from the thread formation zone 104 is even greater. Furthermore, the thread insertion slot 14 includes an angle of inclination ⁇ of less than 90 ° with the direction of rotation (arrow P10) of the friction spinning element 101 screwing into the wedge gap 102.
  • the take-off end of the thread end 300 is prevented by the thread clamp 70 from entering the thread-forming zone 104, at least not before the end of this thread section facing away from the take-off side has reached the thread-forming zone 104.
  • This effect can be supported or can be achieved solely by placing the thread end 300 obliquely on the friction spinning element 101 rotating into the wedge gap 102 in such a way that the thread end facing away from the take-off side, ie the free thread end, is less than the wedge gap 102 at the same time has the trigger-side end of this thread end 300 placed on the friction spinning element 101.
  • the take-off end 140 of the thread insertion slot 14 is at a greater distance from the thread formation zone 104 than the end 141 of the thread insert slot 14 facing away from the take-off side.
  • the thread 30 can be presented in front of the thread insertion slot 14 by the thread clamp 70 in various ways. As shown in FIG. 1, the thread clamp 70 is pivotable in both the horizontal and the vertical plane, so that the thread can also be fed to the thread insertion slot 14 from the side.
  • the thread clamp 70 in the area of the thread insertion slot 14 is, however, expediently moved parallel to this thread insertion slot 14, ie in the thread take-off direction, since the thread in this way by one and the same pivoting movement , possibly with a short interruption in the area of the thread insertion slot 14, the thread insertion slot 14 and thus the wedge gap 102 and then removed from the wedge gap 102.
  • the piecing position is selected in a very specific manner.
  • the thread 30 is brought to a defined length by the separating device 53 and brought outside the wedge gap 102 to the length region of the thread forming zone 104, where it is still held by the thread clamp 70.
  • This piecing position is determined in such a way that after switching on the fiber feed, the thread end 300 now sucked into the thread insertion slot 14 by applying the negative pressure to the suctioned friction spinning element 101 reaches the wedge gap 102 within the length range of the thread formation zone 104, but does not extend beyond it at any of its ends.
  • the thread 30 is placed in a precisely defined length on the fibers located in the wedge gap 102 and forming a rotating fiber bundle 31.
  • the compressed air nozzle 702 can be dispensed with, since the thread 30 is sucked in solely by the action of the negative pressure applied to the friction spinning element 101.
  • the compressed air nozzle 702 thus only acts as a support and enables the thread end 300 to be fed to the wedge gap 102 more quickly and therefore more precisely in terms of time.
  • the thread clamp 70 is movable in the direction of the thread insertion slot 14. It has been shown that it is advantageous for a safe piecing if the thread clamp 70 when the thread end 300 is inserted into the thread insertion slot 14, i.e. when the thread end 300 is fed to the wedge gap 102, has different distances from the take-off end of the wedge gap 10215 and thus the thread formation zone 104. For this
  • the finer the thread the greater the length of the thread end 300 located in the thread formation zone; conversely, the thread length in the wedge gap 102 20 need not be so great for coarser yarns. This is because with finer yarns the amount of fiber supplied per unit of time is smaller than with coarser yarns, so that the fiber mass required for sufficient strength of the piecer is only reached after a somewhat longer period of time.
  • the thread end 300 is placed later on the fibers in the wedge gap 102 with respect to the switching on 30 3 of the fiber feed for fine threads than for coarse threads.
  • This timing is done by appropriately controlling the movement of the arm 700 and the air nozzle 702.
  • Another supportive measure is an adapted one
  • the thread 30 is only delayed after it has reached the thread formation zone 104 Deducted. In the exemplary embodiment described, this is done by stopping the thread clamp 70 for inserting the thread end 300 into the thread insertion slot 14 and maintaining a certain downtime until the start of the swiveling movement of the thread clamp 70 causing the take-off. If the thread take-off takes place after the thread 30 has been released by the bobbin 400, the time for lowering the bobbin 400 onto the winding roller 401 must be selected accordingly. In this case too, the delay before the thread pull-in is started should be chosen longer for fine threads than for coarse threads.
  • the thread end 300 Since the thread end 300 is held by the thread clamp 70 for at least a certain time even after it has been fed to the wedge gap 102, it is ensured that the thread 30 first enters the thread formation zone 104 only with its free end and then only with its region on the take-off side.
  • the thread end 300 can also be fed into the wedge gap 102 by releasing the clamping action of the thread clamp 70, the piecing draw-off then taking place through the bobbin 400, which is again lowered onto the spinning roller 401.
  • this contacting of the take-off side should Thread area with the thread formation zone 104 can be prevented even longer after release by the thread clamp 70, so this can be done with the aid of a thread guide 73 FIG.
  • This thread guide can be formed, for example, by a bracket pivotable in the direction of arrow P9. As a result, the thread 30 drawn off from the thread formation zone 104 is deflected in the direction of the fiber feed side, ie to the side facing the fiber feed channel 24.
  • the thread insertion slot 14 is separated from the inside 132 of the cover 130 in its area facing away from the take-off side by a slot bottom 142.
  • this slot base 142 forms an acute angle ⁇ with the inner wall of the cover 130.
  • a suction air nozzle 71 serves as the thread holding device 7, which opens into the end 141 of the thread insertion slot 14 from the side facing away from the take-off side.
  • the suction air nozzle 71 opens into the slot bottom 142 parallel to the thread formation zone 104.
  • the thread 30 is brought from the spool 400 up to the thread insertion slot 14 and exposed to the action of the controllable suction air flow in the suction air nozzle 71.
  • This suction air flow exerts an elastic restraining force on the thread 30 and continues to pull it off when released by the thread clamp 70 until the thread 30 stops during the thread return delivery turned back coil 400 is stopped.
  • the movable thread clamp 70 now releases the thread 30 so that it is held solely by the suction air nozzle 71.
  • FIG 72 In order to prevent the thread from " extending from the spool 400 to the now ineffective suction air nozzle 71, loops that can prevent proper functioning when spinning, when there is a longer machine standstill, there is additionally a fixed" thread clamp per spinning position according to FIG 72 provided as a rigid clamping element.
  • this has a rigid clamping element 720, with which a movable clamping element 721 (arrow PIl) cooperates.
  • This movable clamping element 721 can be acted upon by a lifting magnet 722 in one direction of movement and acted upon by a retaining spring 723 in the opposite direction.
  • the suction air in the suction air nozzle 71 is switched off and the thread 30 is released by the thread clamp 72, so that the thread end 300 is sucked into the thread insertion slot 14 due to the negative pressure acting on the friction spinning element 101.
  • the thread end 300 slides along the slot bottom 142.
  • this slot bottom 142 ′ is inclined at an acute angle CC to the wedge gap 102. So that it is also ensured in this embodiment that the free end of this thread end 300 comes into contact with the fibers in the wedge gap 102 in front of the area of the thread section facing the take-off side, the thread guide 73 shown in FIG. 2 is used for piecing from the position shown in FIG brought the position 73 '. In this way, the thread 30 is deflected towards the fiber feed side during the piecing process.
  • the thread clamp 72 can be adjusted in different positions parallel to the wedge gap 102 (arrows P12).
  • the thread 30 is pulled in a time-coordinated manner against the elastic retention force exerted by the suction air nozzle 71 on the thread 30 until the thread 30 leaves the effective range of the elastic retention force of this suction air nozzle 71 and through the thread insertion slot 14 onto the wedge gap fibers located in the thread formation zone 104 is placed.
  • the desired dwell time of the thread end 300 in the thread formation zone 104 can be determined.
  • Thread 30 gives a defined length.
  • this separating device 710 causes the thread end, which has been given an undefined length and shape by the pneumatic return delivery and holding by unscrewing and sucking out individual fibers, again having a defined shape.
  • the cover 130 carries an initiator 80 for controlling a closure element 8, by means of which the thread insertion slot 14 is covered during the standstill of the spinning station 1 and during the normal spinning process.
  • the closure member 8 extends parallel to the thread insertion slot 14 essentially over its entire length and is connected to the armature 810 of a solenoid 81, which in turn is in control connection with the initiator 80 via the control member 6.
  • the initiator 80 is arranged on the cover 130 in such a way that the closure member 8 immediately releases the thread insertion slot 14 when the arm 700 moved in the direction of the suction air nozzle 71 reaches the cover 130. Its arrangement at the trigger-side or opposite end of the cover 130 thus depends on the feed direction of the thread 30.
  • a switching flag 74 is provided on the cover, which triggers a pulse on the arm 700 in a switch (not shown) designed as an initiator when the thread clamp 700 has reached its transfer position.
  • This second initiator causes the thread clamp 70 to be opened so that the thread 30 can be sucked into the suction air nozzle 71.
  • this second initiator can be connected to a control device for controlling the piecing process and can be used to trigger the piecing program.
  • the closure member 8 can be controlled from the maintenance carriage 5 which can be moved along the machine. If, however, a device for mass piecing a large number of open-end fiction spinning devices 10 is provided, this closure member 8 can also be controlled centrally from a machine-side control device.
  • the subject matter of the invention can be modified in many ways and is therefore not limited to the exemplary embodiments shown. Further modifications are possible by exchanging features with one another or by replacing them with equivalents and combinations thereof and fall within the scope of the present invention.
  • the invention is not restricted to the design of a thread return device designed as a thread clamp 70, since instead of this thread clamp 70 a pneumatic gripper can also be used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)

Abstract

Pour relier les fils sur une installation de filage open-end à friction possédant deux éléments de filage à friction (101) entraînés dans la même direction et formant une ouverture conique du type à aspiration, le fil (30) est amené à l'ouverture de telle manière que le fil (30) atteint d'abord avec son extrémité libre la région (104) où se forme le fil. L'amenée des fibres dans l'ouverture est commandée de telle manière que l'extrémité du fil (300) vienne en contact avec les fibres simultanément avec l'arrivée dans la région de formation du fil (104). Les éléments de filage à friction (101) sont recouverts d'une enveloppe (130) qui forme un conduit d'amenée des fibres (24). Cette enveloppe possède, en plus du conduit d'amenée des fibres (24), une rainure pour l'insertion du fil (14) qui s'étend essentiellement dans le sens longitudinal de l'élément de filage à friction (101). Celui-ci s'étend depuis le côté extérieur de l'enveloppe (130) jusqu'à son côté intérieur et depuis l'extrémité du côté du retrait jusqu'à une distance maximale de l'extrémité de l'ouverture (240) qui est tournéeen sens opposé au côté du retrait. A l'extérieur de l'ouverture conique est installé un dispositif de maintien du fil (7), qui maintient le fil (30) essentiellement parallèle à la fente d'entrée du fil (14). Ce système maintient le fil (30) à l'extrémité de retrait de l'élément de filage à friction (101) loin de l'ouverture conique, jusqu'à ce que l'extrémité du fil (30) atteigne l'ouverture conique.
EP86903236A 1985-06-24 1986-06-05 Procede et dispositif pour rattacher les fils sur une installation de filage a fibres liberees a friction Expired EP0258248B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853522518 DE3522518A1 (de) 1985-06-24 1985-06-24 Verfahren und vorrichtung zum anspinnen einer offenend-friktionsspinnvorrichtung
DE3522518 1985-06-24

Publications (2)

Publication Number Publication Date
EP0258248A1 true EP0258248A1 (fr) 1988-03-09
EP0258248B1 EP0258248B1 (fr) 1989-11-08

Family

ID=6274014

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86903236A Expired EP0258248B1 (fr) 1985-06-24 1986-06-05 Procede et dispositif pour rattacher les fils sur une installation de filage a fibres liberees a friction

Country Status (9)

Country Link
US (1) US4817380A (fr)
EP (1) EP0258248B1 (fr)
JP (1) JPS63501159A (fr)
CN (1) CN1012442B (fr)
BR (1) BR8606692A (fr)
CS (1) CS465286A3 (fr)
DE (2) DE3522518A1 (fr)
IN (1) IN167799B (fr)
WO (1) WO1987000214A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3734565A1 (de) * 1987-10-13 1989-05-03 Schubert & Salzer Maschinen Verfahren und vorrichtung zum anspinnen eines fadens an einer offenend-spinnvorrichtung
DE10141046A1 (de) * 2001-08-22 2003-03-06 Schlafhorst & Co W Serviceaggregat für eine Kreuzspulen herstellende Textilmaschine
DE102008055965A1 (de) * 2008-11-05 2010-05-06 Oerlikon Textile Gmbh & Co. Kg Serviceaggregat zum Versorgen der Arbeitsstellen einer Offenend-Spinnmaschine
CN103757766B (zh) * 2014-01-29 2015-12-16 天津商业大学 加捻装置

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AT291821B (de) * 1966-08-24 1971-07-26 Rieter Ag Maschf Einrichtung zum Aufbauen und Rückspeisen einer Garnreserve an einer Spinnkammer-Spinnvorrichtung
DE3167885D1 (en) * 1980-02-16 1985-02-07 Hollingsworth Uk Ltd Apparatus and method of open-end spinning yarn
DE3168150D1 (en) * 1980-10-08 1985-02-21 Hollingsworth Uk Ltd Friction open-end spinning method and apparatus
JPS6124541Y2 (fr) * 1980-12-04 1986-07-23
CS224293B1 (en) * 1981-07-31 1984-01-16 Burysek Frantisek Method of and apparatus for restoring spinning process after an automatic bobbin exchange failure or on count change in open-end spinning machines
DE3308247A1 (de) * 1983-03-09 1984-09-13 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
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
DE3338833A1 (de) * 1983-10-26 1985-05-09 Fritz 7347 Bad Überkingen Stahlecker Verfahren und vorrichtung zum anspinnen eines garnes an einem spinnaggregat einer oe-friktions-spinnmaschine
DE3338834A1 (de) * 1983-10-26 1985-05-09 Fritz 7347 Bad Überkingen Stahlecker Oe-friktionsspinnmaschine
DE3340435A1 (de) * 1983-11-09 1985-05-15 Fritz 7347 Bad Überkingen Stahlecker Oe-friktionsspinnmaschine mit einer vielzahl von spinnaggregaten
DE3342472A1 (de) * 1983-11-24 1985-06-05 Fritz 7347 Bad Überkingen Stahlecker Verfahren zum anspinnen eines garnes an einem spinnaggregat einer oe-friktionsspinnmaschine und oe-friktionsspinnmaschine
DE3401316A1 (de) * 1984-01-17 1985-07-18 Fritz 7347 Bad Überkingen Stahlecker Verfahren zum stillsetzen und wiederanfahren eines oe-friktionsspinnaggregates
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DE3417308A1 (de) * 1984-05-10 1985-11-21 W. Schlafhorst & Co, 4050 Mönchengladbach Verfahren und vorrichtung zum fadenansetzen bei friktionsspinnmaschinen

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Also Published As

Publication number Publication date
BR8606692A (pt) 1987-08-11
CS465286A3 (en) 1992-02-19
US4817380A (en) 1989-04-04
CN1012442B (zh) 1991-04-24
EP0258248B1 (fr) 1989-11-08
DE3666850D1 (en) 1989-12-14
DE3522518C2 (fr) 1988-10-06
DE3522518A1 (de) 1987-01-02
CN86105619A (zh) 1987-07-08
WO1987000214A1 (fr) 1987-01-15
IN167799B (fr) 1990-12-22
JPS63501159A (ja) 1988-04-28

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