EP0395880B1 - Verfahren und Vorrichtung zum Anspinnen eines Fadens an einer mit einem Spinnrotor arbeitenden Offenend-Spinnvorrichtung - Google Patents

Verfahren und Vorrichtung zum Anspinnen eines Fadens an einer mit einem Spinnrotor arbeitenden Offenend-Spinnvorrichtung Download PDF

Info

Publication number
EP0395880B1
EP0395880B1 EP90105901A EP90105901A EP0395880B1 EP 0395880 B1 EP0395880 B1 EP 0395880B1 EP 90105901 A EP90105901 A EP 90105901A EP 90105901 A EP90105901 A EP 90105901A EP 0395880 B1 EP0395880 B1 EP 0395880B1
Authority
EP
European Patent Office
Prior art keywords
speed
rotor
thread
spinning
spinning rotor
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
EP90105901A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0395880A1 (de
Inventor
Michael Strobel
Edmund Schuller
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
Rieter Ingolstadt Spinnereimaschinenbau 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 Rieter Ingolstadt Spinnereimaschinenbau AG filed Critical Rieter Ingolstadt Spinnereimaschinenbau AG
Publication of EP0395880A1 publication Critical patent/EP0395880A1/de
Application granted granted Critical
Publication of EP0395880B1 publication Critical patent/EP0395880B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • D01H4/50—Piecing arrangements; Control therefor for rotor spinning
    • 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
    • D01H4/04—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 imparting twist by contact of fibres with a running surface
    • D01H4/08—Rotor spinning, i.e. the running surface being provided by a rotor
    • D01H4/12—Rotor bearings; Arrangements for driving or stopping

Definitions

  • the present invention relates to a method for piecing a thread on an open-end spinning device working with a spinning rotor, in which a thread end is delivered to the fiber collecting surface at a starting speed of the spinning rotor, connected there to the fibers of a fiber ring and then newly integrated into the spinning rotor with continuous integration fed fibers is withdrawn as a continuous thread from the spinning rotor, and devices for performing this method.
  • Rotor spinning devices work at extremely high rotor speeds of 100,000 rpm and more.
  • the thread is spun at the highest possible production speed, to which, depending on the fiber material, the spinning conditions are matched by appropriate selection of the spinning rotor, the thread take-off nozzle, etc.
  • piecing is usually carried out at a lower rotor speed, which is kept constant for the duration of the piecing (DE-OS 2,058,604).
  • the piecing can also be initiated at a lower rotor speed which the spinning rotor passes through when it starts up from standstill (DE-PS 2,321,775).
  • the piecing rotor speed deviates significantly from the production rotor speed, so that there are no optimal spinning conditions in this critical working phase. It is therefore often necessary to adapt to these low rotor speeds by appropriate selection of the spinning rotor and thread take-off nozzle, which, however, leads to the fact that the desired high rotor speeds can then no longer be maintained during production.
  • the piecing conditions become even more critical due to the increasing rotor speed.
  • the object of the invention is therefore to create a method and devices based on the above-mentioned prior art which increase piecing security.
  • This object is achieved in that the rotor speed is brought up from the preparation speed to a speed which is lower than the preparation speed, and only then is the rotor speed increased again to the production speed.
  • the attachment speed at which contact is made between the thread end and the fiber ring is therefore relatively high, possibly even coincides with the production rotor speed, so that the required propagation of rotation from the thread section located in the thread take-off tube to the overlap area of the thread end and fiber ring is ensured is and there is no danger that, as in the prior art, this will take place only incompletely, uncontrolled, or possibly not at all.
  • the relatively high rotor rotation during the attachment ie during the return of the thread end to the fiber collecting surface, has the effect that due to the good propagation of rotation in the piecing area, the latter has a high strength, whereby thread breaks are counteracted.
  • the fiber ring continues to grow beyond the normal dimension until the thread take-off point in the spinning rotor has rotated once. Since the rotor speed decreases after the attachment for pulling off the mass-increasing part of the fiber ring, the increase in mass of the fiber ring with respect to the thread tension is completely or at least largely compensated for by the speed reduction, so that an essentially constant thread tension during the removal of the attachment from the spinning rotor is achieved. This counteracts the risk of thread breaks, since this ensures that the thread tension does not exceed the permissible values.
  • the reduction in the rotor speed can be ended depending on various criteria, e.g. B. depending on the thread tension, but it has proven to be advantageous to end this reduction depending on a predetermined time or depending on reaching a predetermined minimum rotor speed.
  • the setting speed before the return of the thread end to the fiber collecting surface is temporarily kept constant and is only reduced in the time between the return of the thread end and the start of the thread take-off.
  • the starting speed of the spinning rotor can be controlled in a particularly simple manner if it accelerates from standstill to a speed above the starting speed and is brought from this speed to the starting speed.
  • This speed which is higher than the starting speed and on the basis of which the rotor speed is reduced, can be the production speed or a speed lying between the production speed and the setting speed.
  • the lowering of the rotor speed begins at a speed above the attachment speed and is continued during the piecing process.
  • the rotor speed after the removal of the mass-increasing part of the fiber ring is further reduced until the accelerating thread take-off speed and the decreasing rotor speed have reached a certain desired ratio to one another, whereupon the rotor speed and the thread take-off speed be accelerated to production speed.
  • the end of the reduction in the rotor speed can be empirically determined, whereby a rough adaptation to the thread take-off speed is achieved. This is sufficient in most cases.
  • the particular desired ratio is the same as for production speed and from the moment this ratio is reached, even during the subsequent acceleration of the Rotor speed is maintained. This can also be determined empirically. However, it is particularly expedient if the thread take-off speed is monitored and, if the rotor speed reaches the same percentage value of the production value as the thread take-off speed, the reduction in the rotor speed is ended.
  • the thread take-off speed is advantageously monitored until it has reached its production value, and the rotor speed is accelerated in synchronism with the increase in the thread take-off speed from the point in time when it reaches the same percentage value as the thread take-off speed when it is reduced.
  • the spinning rotor is driven by drive means which can be brought into and out of the drive connection with the spinning rotor.
  • drive means which can be brought into and out of the drive connection with the spinning rotor.
  • the change in speed of the spinning rotor can in principle be controlled in any way. It has proven to be advantageous in the case of a device which has two drive means which run at different speeds when the spinning rotor uses the lower speed drive means to reduce its speed and is brought into driving connection with the higher speed drive means to increase its speed.
  • the desired braking and / or run-up behavior of the spinning rotor can be achieved by appropriate control of the slip.
  • the invention can further provide that the reduction of the rotor speed is carried out in two phases, the first phase being essentially matched both to the propagation of rotation in the fiber ring and to the desired thread tension, and the second phase to limit the thread tension tolerances that occur to the thread tension.
  • This two-phase reduction in the rotor speed can advantageously be achieved in that it is effected or supported in the first phase by the activation of a brake.
  • a further advantageous variant of the method according to the invention consists in that, in order to change the rotor speed, the spinning rotor is separated from drive means running at production speed and connected to auxiliary drive means which, according to the desired speed profile of the spinning rotor, initially slows down during piecing and later again until it is reached the production speed are accelerated, whereupon the spinning rotor from the auxiliary drive means separated and connected to the drive means running at production speed.
  • the thread end is returned to the fiber ring at a higher speed than the pulling off of the part of the fiber ring which increases in mass.
  • the thread take-off tube and the thread take-off device an increased rotation in the drawn thread. So that this rotation can be reduced again before the thread is wound onto the bobbin, it is advantageous if during the time during which the thread take-off speed has not yet reached its production value, the thread is given the pull-off movement at a greater distance from the spinning rotor than after reaching the production value.
  • the rotation can be distributed over a greater length of thread, so that the wound thread, despite the increased number of turns during the piecing, receives a rotation which essentially does not exceed the normal rotation values or only slightly.
  • means for reducing the rotor speed from the set-up speed to a lower value means for re-accelerating the rotor speed after a desired minimum value or a period of time intended for this purpose has been reached, and means for appending the running rotor speed to the device desired production speed provided.
  • the spinning rotor can have its desired speed behavior in coordination with the application of the thread and the removal of the piecer.
  • a control device is provided, with the aid of which it is possible to coordinate the reduction and re-acceleration of the rotor speed with the return of the thread end to the fiber collecting surface such that the thread end reaches the fiber collecting surface at a rotor speed that is higher than when the fiber ring, which is partially in the spinning rotor before the start of pulling, is subsequently pulled off.
  • This timing control means that after the end of the thread has been returned to the fiber collecting surface, the rotor speed, possibly further, is reduced so that the piecer receives the desired strength on the one hand and on the other hand the thread tension when the piecer is pulled off does not exceed the predetermined values.
  • timing control means are assigned appropriate adjusting means for determining the duration during which the rotor speed is reduced.
  • means can be provided for monitoring the rotor speed or values proportional to the rotor speed in order to prevent the speed of the spinning rotor from falling below a predetermined minimum value.
  • monitoring means for monitoring the thread take-off speed or values proportional to this speed are preferably means in addition to the means for monitoring the rotor speed or this speed, means for converting the measurement values thus obtained into percentages of the respective full values
  • Production values and comparison means are provided for comparing the percentages of thread take-off speed and rotor speed and for triggering a switching pulse when it is reached matching percentages to finish reducing the rotor speed.
  • the monitoring means are connected in terms of control to means for generating a rotor speed proportional to the thread take-off speed.
  • a belt pressing device for changing the rotor speed in a spinning rotor that can be driven by a belt, which is connected to the control device for changing the contact pressure and thus also the slip between belt and rotor shaft.
  • the spinning rotor can optionally be driven by one of two belts which can be driven at different speeds, if at least the arm of a two-armed changeover lever which drives the spinning rotor at a lower speed, with its Help the spinning rotor can be brought into drive connection with one or the other belt, is designed as a belt pressing device. In this way, the speed reduction depending on the selected Apply pressure faster or slower. If both arms of the switch lever are designed as belt pressing devices, the rotor acceleration can also be controlled.
  • the contact pressure between the belt and the spinning rotor or rotor shaft is expediently determined.
  • the belt pressing device is advantageously associated with an adjusting device for determining the maximum or minimum contact pressure between the belt and the rotor shaft. If a single belt is provided, the minimum contact pressure is set for the speed reduction, while the maximum contact pressure is decisive for the acceleration. The maximum contact pressure also determines the rotor deceleration and the rotor acceleration if these speed changes are made with the aid of two belts driven at different speeds.
  • a large number of similar open-end spinning devices are arranged next to one another, which can be operated with the aid of one or more maintenance device (s) which can be moved along this large number of spinning devices.
  • the maintenance device can easily control the speed of the spinning rotor in such a case, it is preferably provided that the belt pressing device is connected to a control lever to which an actuating element of the maintenance device that can be controlled from the control device can be delivered.
  • the open-end spinning device expediently has a stop to limit the feed path of the Actuator of the maintenance device.
  • the rotor speed can be controlled in a simple manner by controlling the slip between the spinning rotor or its shaft and the drive means which continue to run at unchanged speed.
  • a device for spinning a thread in an open-end spinning device with a spinning rotor having a fiber collecting surface and a belt for driving the spinning rotor mounted by means of a shaft and with a belt pressing device which has a roller lever carrying a belt pressing roller can be brought into contact with the belt by means of a first elastic element with its belt pressure roller and which is also associated with a brake lever which can be advanced to the rotor shaft and which, apart from a braking position, can be brought into different relative positions with respect to the roller lever, the brake lever and the roller lever being associated with cooperating stops , by means of which the roller lever can be lifted off the belt with its belt pressure roller when the brake lever moves into its braking position, with a device for feeding fibers onto the fiber collecting surface and with means for returning a thread end
  • this device can be used both for reducing the speed and for increasing the speed of the spinning rotor when the rotor speed is not reduced after piecing, and is therefore of independent importance.
  • roller lift has two arms, one arm of which carries the belt pressure roller and is acted upon by the second elastic element, while the arm facing away from the belt pressure roller is acted upon by the first elastic element .
  • a device for spinning a thread in an open-end spinning device with a spinning rotor having a fiber collecting surface, with a belt for driving the spinning rotor mounted by means of a shaft, with a belt pressing device which carries a belt pressing roller Roller lever which can be lifted off the rotor shaft by a brake lever and which is associated with a controllable damping device, further provided with a device for supplying fibers to the fiber collecting surface, with means for pulling off the spun thread and with means for changing the speed of the spinning rotor according to a further expedient embodiment of the subject matter of the invention that the damping device is designed as a plate spring mounted on the pivot axis of the roller lever is assigned a load element that is adjustable parallel to the pivot axis.
  • a damping device for controlling the acceleration behavior of a spinning rotor can also be used regardless of whether the speed of the spinning rotor is reduced after piecing or not. Such a damping device is therefore of independent
  • the belt pressing device is assigned a separate actuating device for each open-end spinning device, via which the belt pressing device is connected to the control device.
  • This connection with the actuating device can be made electrically, inductively or in another suitable manner, so that the belt pressing device can be actuated in the desired manner at the desired time on the basis of corresponding control commands from the control device.
  • a brake with controllable braking action can also be provided, which can be brought into effect in the desired manner on the spinning rotor or the rotor shaft in order to achieve the desired rotor speed curve.
  • a brake lever can be provided which is in the braking direction can be actuated by a control element via an elastic element and in the lifting direction via a rigid stop.
  • the invention can also be implemented if an individual drive motor is provided for the spinning rotor.
  • the control device preferably contains a generator for generating electrical values, by means of which the speed of the spinning rotor is controlled in the desired manner.
  • control device is connected to a device for the early maintenance of the desired yarn twist, which combs the combed state of the fiber beard at the time the thread end is returned to the Quilt area determined and depending on the determined combing condition not only controls the thread take-off, but also the rotor speed.
  • a thread tension monitor is expediently provided, which is connected to the control device for control purposes, furthermore means for comparing the measured thread tension with a predetermined reference tension and means for changing the data stored in the control device are provided in such a way that when the next piecing process, the rotor speed is reduced so that thread tension deviations are reduced.
  • the control device contains means which store the average value of the thread tension in the case of undisturbed production as a reference value. In such a case, there is no need for separate setting means for entering such a reference value.
  • the invention offers a solution for the first time, such as the contrary demands for conditions during the actual application, which fully or at least largely correspond to the normal operating conditions, and for low thread tensions when removing the application, which - based on the same lengths - are a multiple of the normal Has thread mass, can be met.
  • the device is simple in construction and can be used in conjunction with all the usual rotor drive mechanisms Devices find application. The invention thus enables an increase in piecing security.
  • the open-end spinning device is part of an open-end spinning machine 1, along which a maintenance device 2 can be moved.
  • Each open-end spinning device 10 has a fiber feeding or delivery device 11 and a dissolving device 12.
  • the delivery device 11 consists of a delivery roller 110 with which a feed trough 111 cooperates elastically.
  • the feed trough 111 is pivotally mounted on an axis 112, which also carries a clamping lever 113, which is designed as a guide element for a fiber sliver 3 and can be brought into contact with the feed trough 111 by means of an electromagnet 114 or can be lifted off the latter again.
  • the opening device 12 is essentially designed as a opening roller 121 arranged in a housing 120.
  • a fiber feed channel 122 extends from it to the spinning rotor 100, from which the spun thread 30 is drawn off through a thread draw-off tube 101.
  • the spinning rotor 100 is located in a housing, not shown, which is connected to a vacuum source, also not shown, in order to generate the required negative pressure for spinning.
  • the entire open-end spinning device 10 including delivery device 11 and opening device 12 is covered by an openable cover 13.
  • a pair of draw-off rollers 14 with a draw-off roller 140 driven at production speed and an elastically attached to the draw-off roller 140 and driven by the take-off roller 141 serves for the withdrawal of the thread 30 from the spinning rotor 100.
  • the thread 30 is monitored by a thread monitor 15.
  • the thread then passes to a winding device 16 which has a driven winding roller 160.
  • the spooler 16 also has a pair of pivotable spool arms 161 which rotatably hold a spool 162 therebetween.
  • the bobbin 162 lies on the winding roller 160 during the undisturbed spinning process and is consequently driven by it.
  • the thread 30 to be wound onto the spool 162 is inserted during the undisturbed spinning process into a traversing thread guide 163, which is moved back and forth along the spool 162 and thereby ensures a uniform distribution of the thread 30 on the spool 162.
  • the maintenance device 2 which can be moved along the open-end spinning machine 1, has a control device 20 which is connected to a swivel drive 210 of a swivel arm 21 which at its free end carries an auxiliary drive roller 211.
  • the auxiliary drive roller 211 is driven by a drive motor 212, which is also connected to the control device 20 for control purposes.
  • the swivel arms 161 can be supplied with swivel arms 22, which are likewise pivotably mounted on the maintenance device 2 and whose swivel drive 220 is in a control connection with the control device 20.
  • the sliver 3 is presented with the help of the rotating delivery roller 110 and the feed trough 111, which is elastically pressed against this delivery roller 110, of the opening roller 121, which dissolves the sliver 3 into fibers 31, which then pass through the fiber feed channel 122 into the interior of the Spinning rotor 100 are promoted where they deposit in the form of a fiber ring 32.
  • the thread 30 located in the draw-off is connected to this fiber ring 32 and is rotated by the rotation of the spinning rotor 100. This rotation is propagated into the fiber collecting groove in which the fiber ring 32 is formed, whereby the fiber ring 32 is continuously screwed into the end of the thread 30 and is thus connected to it.
  • the thread 30 drawn off from the spinning rotor 100 with the aid of the pair of draw-off rollers 14 is wound onto the bobbin 162 lying on the bobbin roller 160 during production, the thread 30 being oscillated by the traversing thread guide 163 for uniform winding on the bobbin 162.
  • the bobbin 162 If a thread break occurs, which is registered by the thread monitor 15 due to the absence or drop of the thread tension, the bobbin 162 is lifted from the winding roller 160 by means not shown, whereby the bobbin 162 is stopped.
  • the thread monitor 15 sends a control pulse to the electromagnet 114, which actuates the clamping lever 113 and thus clamps the sliver 3 between itself and the feed trough 111.
  • this pivoting movement of the clamping lever 113 causes the feed trough 111 to pivot away from the delivery roller 110, so that the sliver 3 can no longer be fed to the opening roller 121.
  • the yarn break is eliminated in the usual manner.
  • the fiber feed is released by actuating the electromagnet 114 again, so that now fibers 31 again enter the spinning rotor 100 and in turn form a fiber ring 32 there.
  • the thread end is returned to the fiber collecting surface 102 (see FIG.
  • the thread end 300 depositing over part U 'of the circumference U of the fiber collecting surface 102 and its radial intermediate region 301 the position 301a occupies. After a short stay on the fiber collecting surface 102, the thread end 300 is subjected in a known manner to a thread draw-off which now runs up to its production value. The thread end 300 is tensioned and reaches the position 301b with its intermediate region 301. The thread end 301 pulls on the fiber ring 32 so that, viewed in the circumferential direction of the fiber collecting surface 102, fibers extend from the thread end 300 to the fiber ring 32 on both sides from the attachment point 320 and form fiber bridges 321 and 322.
  • the intermediate region 301 of the thread end 300 reaches the position 301c.
  • the fiber bridges 321 and 322 tear and wind in the form of wild windings 323 around the thread end 300.
  • the size of the fiber bridge 322 and thus the size of the accumulation of windings 323 essentially depends on the size of the diameter of the spinning rotor 100.
  • a piecing device 33 in two different ways. As can be clearly seen from this figure, a piecing device 33 generally has three length sections 330, 331 and 332.
  • the first length section 330 is formed by the overlap region of the returned thread end 300 and the fiber ring 32 which is already in the spinning rotor 100 at the time of the return of the thread.
  • This length section 330 also contains the wild turns 323 that are formed from the fiber bridge 322 (see FIG. 1). Since the delivery device 11 continues to deliver new fibers 31 to form a fiber ring 32 on the fiber collecting surface 102, the fiber ring 32 is reinforced by the newly fed fiber mass 324.
  • the second length section 331 of the piecing device 33 also has a reinforced cross-section, which stems from the fact that even after the beginning of the thread take-off, an additional fiber mass 324 enters the spinning rotor 100 through the continuous supply of fibers 31, so that the fiber ring 32 is completed until the first revolution of the attachment point 320 in the spinning rotor 100 generally has a mass which is greater than the mass after the first rotation of the attachment point 320.
  • the first length section 330 which is formed by the overlap region of thread end 300 and fiber ring 32, has such a length, which is given by the aforementioned part U 'of the circumference U of the spinning rotor 100.
  • the two length sections 330 and 331 together have a length which is predetermined by the circumference U of the spinning rotor 100.
  • the piecing device 33 has already reached the desired thickness from the end of the length section 331, so that the third length section 332 mentioned is omitted in this case.
  • the two length sections 330 and 331 are followed by a third length section 332, which is either stronger or weaker than the thread 30 and can have different lengths.
  • the deviation of this length section 332 from the nominal thickness of the thread 30 depends on whether it has been possible to bring the fiber feed and thread take-off to the same percentage value of their production values by the end of the length section 331.
  • the thread end 300 on the one hand and the fiber ring 32 on the other hand must have a sufficiently large mass. If the thread end 300, which, of course, can have a tapered shape in a known manner by appropriate pretreatment, does not have sufficient mass, a thread break will occur in this area.
  • FIG. 3 shows a schematic comparison of the speed V A of the thread take-off and the speed n R of the spinning rotor 100 in percent, the baseline representing 0%, while the upper limit line denotes 100% of the respective production speed or speed.
  • the speed n R of the spinning rotor 100 is started to be reduced, so that the thread end 300 reaches the fiber collecting surface 102 of the spinning rotor 100 at a rotor speed that is higher than when it is subsequently drawn off of the piecing ring 33 forming the piecing ring 33.
  • the speed reduction is ended, whereupon the spinning rotor 100 can run up again to its full speed n R (100%), which it reaches according to FIG. 3 at the time t6, ie only after it has been reached the full speed V A through the thread draw.
  • the attachment speed is still at the production speed, ie the spinning rotor 100 still has its full speed n R (100%) at this point in time, which is the case in the exemplary embodiment shown
  • the start of thread take-off (see speed V A ) is only approx. 94% of the full speed (100%).
  • the reduction in speed n R is continued for a predetermined period of time, except for a speed that is lower than the starting speed of spinning rotor 100.
  • the speed reduction is ended in a time-dependent manner, namely at the point in time t der at which the piecing device 33 has entered the thread take-off tube 101, so that this piecing device 33 no longer has any radial forces due to the rotor rotation in the draw-off Thread 30 can arise.
  • the spinning rotor 100 is then accelerated again to its full speed n R.
  • the cross-sectional profile of the newly spun thread 30 is shown in the lower part of FIG. 2.
  • the tension S F in the thread was derived from the cross-sectional profile of the thread 30 and entered on the same scale.
  • the conditions in the spinning rotor 100 still essentially correspond to those conditions which are effective during the normal production process. Not only is a certain number of real rotations generated in the thread 30 as a function of the number of rotor revolutions, but due to the high effective centrifugal forces (see high thread tension S F ' ), a high false wire is also generated which propagates up to the binding point 320 is and ensures that a firm connection between thread end 300 and fiber ring 32 is generated.
  • FIG. 4 shows a modification of the method previously described with the aid of FIG. 3.
  • the main difference is that the reduction in the speed n R of the rotor begins (time t 1 ' ) before the thread end 300 reaches the fiber collecting surface 102 of the spinning rotor 100, ie the reduction in the rotor speed begins at a speed above the starting speed.
  • the preparation speed is therefore below the production speed.
  • the reduction in the rotational speed n R of the spinning rotor also continues during the withdrawal, possibly even after deduction of the mass-increasing part of the fiber ring, which increases until the first revolution of the attachment point 320 and thus has the length of a circumference U, until the decreasing speed n R of the spinning rotor 100 and the accelerating speed V A of the thread take-off have a desired relationship to one another.
  • This ratio can be the same as for the spinning station production speed. However, there may also be a different ratio be provided, for example in order to generate a thread section with increased rotation to compensate for the low rotor speed and thus also the low centrifugal forces. If the desired ratio should correspond to the production conditions, the rotor speed and the thread take-off must have reached essentially the same percentage value - in each case based on the respective production values.
  • the speed n R of the spinning rotor 100 has already dropped to approximately 90% of the full speed n R of the spinning rotor 100 at the start of the thread take-off, so that the centrifugal forces acting on the thread 30 are already significantly reduced. Nevertheless, the rotor speed is close to the production speed (100%), so that it is ensured that enough rotation can be introduced into the attachment point 320 to ensure a secure connection between the thread end 300 and the fiber ring 32. Due to the further decreasing speed n R of the spinning rotor 100, a drop in the thread tension is achieved, which is therefore below the normal spinning tension. In the short term, the thread tension increases during the period during which the length section 331 is withdrawn from the spinning rotor 100 until the thread tension S F decreases again towards the end of the withdrawal of this length section 331.
  • the reduction in the rotor speed is continued after the two longitudinal sections 330 and 331 of the piecing device 33 have been pulled off, so that the spinning rotor 100 quickly reaches a speed n R which, as a percentage, corresponds to the speed V A of the thread take-off.
  • Fig. 2 in the length section 332 is shown in dashed lines that at a speed V A of the thread take-off, which is adapted to the effect of the fiber feed in the spinning rotor 100, a thick spot in the thread 30 can be avoided, so that the thread 30 already in such a case has its target strength from time t4.
  • a speed V A of the thread take-off which is adapted to the effect of the fiber feed in the spinning rotor 100
  • a thick spot in the thread 30 can be avoided, so that the thread 30 already in such a case has its target strength from time t4.
  • the rotor speed and the thread take-off speed are accelerated. If the desired ratio already coincided with that at production speed, this will also be maintained during acceleration. If, on the other hand, the desired ratio differs from the production ratio, the ratio between the rotor speed and the thread take-off speed can be adjusted during the joint acceleration of the thread take-off and the rotor speed, but it is also possible to adopt this production ratio only when either the thread take-off speed or the rotor speed already has the Has reached production value.
  • the spinning rotor 100 is not braked until the return R F of the thread end 300 onto the fiber collecting surface 102 of the spinning rotor 100 (time t 1 ′′ ), so that the starting speed of the spinning rotor 100 corresponds to its production speed.
  • the thread end 300 is still exposed to the full speed n R of the spinning rotor 100 when it is returned R F , that is to say when it is being attached, and as a result reaches the fiber collecting surface 102 very quickly and can there also very quickly make contact with the fibers 31 of the fiber ring 32.
  • the production and propagation of false wire in the integration point 320 is correspondingly good.
  • the speed n R of the spinning rotor 100 is reduced extremely rapidly between the times t 1 ′′ and t3.
  • the thread mass and thus the tension in the drawn thread 30 increases between the times t3 and t5 and t5 and t4 again.
  • the speed of the spinning rotor n R is further reduced, however in a manner adapted to the thread mass.
  • the speed n R of the spinning rotor 100 is accelerated again shortly before reaching the time t4, so that the spinning rotor 100 from this point in time t4, ie with the deduction of the length section 331 of the piecing 33, already has 100% of its operating speed again.
  • the speed V A of the thread take-off does not necessarily have to be its final speed V A of the thread take-off has not necessarily reached its final speed if it is only matched to the fiber feed effective in the spinning rotor 100.
  • Fig. 5 shows clearly - one can see from the period before the time t3 before the start of the thread take-off - that the spinning rotor 100 is reduced in two phases in its speed n R.
  • the first phase between the times t3 and t5 is essentially matched to a good propagation of the - real and false - rotation in the fiber ring 32 and also to a thread tension that does not deviate too much from the spinning tension, while the second phase solely the limitation of thread tension fluctuations.
  • the speed n R of the spinning rotor 100 can be reduced accordingly or accelerated again become.
  • Figure 14 shows a further modification, according to which the speed n R of the spinning rotor 100 during the return delivery R F of the thread end 300 to the fiber collecting surface 102 of the spinning rotor 100, ie from time t 1 to time t 3, is kept constant (see speed n R ' ).
  • This constant speed n R ' can be approached either from the production speed (100% - see time t9) or from standstill (0 ° - see time t8).
  • Maintaining a constant speed n R 'of the spinning rotor 100 during the return delivery R F of the thread end 300 has the advantage that the times can be set very precisely for the actual piecing (returning the thread end 300, switching on the fiber feed, beginning of the new thread take-off) , since there are no different speed changes during this time due to tolerances etc.
  • the speed of the spinning rotor 100 is reduced in order to achieve that the thread tension S F is kept essentially constant or at least within tolerable limits due to the piecing .
  • the reduction in speed n R ' which was kept constant before piecing, on the other hand begins at the earliest at time t 1 - ie at the time at which the return delivery R F of the thread end 300 begins.
  • the reduction in the speed n R 'of the spinning rotor 100 can thus be used depending on the respective spinning conditions between the time t 1 of the return delivery R F of the thread end 300 and the time t 3 of the start of the thread take-off.
  • n R ′ the speed of the spinning rotor 100 for pinning from above, even if the spinning rotor 100 has stood before the piecing.
  • the rotor speed is thus in this case first from the standstill to a above the piecing speed (rotational speed n R ') lying speed accelerates and from this speed to the piecing speed (rotational speed n R' decelerated).
  • the speed at which the speed reduction starts is the production speed (100%) according to FIG. 14, but if desired, a speed lying between the speed n R ' and the production speed (100%) can also be selected.
  • This type of activation of the preparation speed is advantageous both when the preparation speed is temporarily kept constant (according to Fig. 14), but also if the speed is further reduced without interruption of the speed reduction after reaching the preparation speed and the application takes place during this speed reduction.
  • the fiber feed into the spinning rotor 100 begins before the thread end 300 reaches the fiber collecting surface 102. However, this is not a prerequisite for carrying out the procedure. If the delivery device 11 is already switched on, but the fibers 31 are prevented from reaching the fiber collecting surface 102, but are diverted beforehand, the thread end 300 can also be returned to the fiber collecting surface 102 before the fiber flow onto the fiber collecting surface 102 is released. In this way, an extremely precise control of the piecing and the dimensioning of the piecing 33 can be controlled.
  • the control device 20 has corresponding time control means 23. Since in practice different fiber materials are spun at different speeds n R of the spinning rotor 100, the time control means 23 according to FIG. 10 are equipped with setting means 230 and 231, with the aid of which the switch-on time and the switch-off time of the speed reduction of the spinning rotor 100 can be determined. Depending on how exactly the speed change Further setting means are of course also possible, but are not shown in FIG. 10 for reasons of illustration.
  • FIG. 10 schematically shows a device with the aid of which the speed n R can be changed.
  • two drive belts 17 and 18 are provided, which can be brought into drive connection with the shaft 103 of the spinning rotor 100 by control from a control device 4.
  • these are connected to one another via a line 40.
  • FIG. 12 shows a concrete solution of the device schematically shown in FIG. 10 for selectively driving the spinning rotor 100 with the aid of the drive belt 17 (main drive means) or the drive belt 18 (auxiliary drive means).
  • the two drive belts 17 and 18 run in the longitudinal direction of the open-end spinning machine 1 and are supported between the individual open-end spinning devices 10 arranged next to one another by support rollers 19 and 190.
  • a switch lever 506 is provided, which by means of a Pivot bearing 54 is mounted centrally and carries a control roller 50 and 51 at the ends of its two arms 500 and 503.
  • the two control rollers 50 and 51 release the drive belts 17 and 18, which are lifted off the shaft 103 of the associated spinning rotor 100 with the aid of the support rollers 19 and 190.
  • Drives 52 and 53 are connected to the two arms of the switch lever 506 of each open-end spinning device 10 via suitable coupling members, which in turn are connected to the control device 4 in terms of control. If the drive device 52 is now actuated by a corresponding control signal output by the control device 4, the control roller 50 is pressed onto the drive belt 17 assigned to it, so that the belt 17 comes to rest against the shaft 103 in its position 17 '. In a similar manner, the belt 18 comes to rest against the shaft 103 of the spinning rotor 100 in its position 18 'when the drive device 53 pivots the switching lever 506 and controls the control roller 51 against the drive belt 18 by appropriate control by the control device 4.
  • the two drive belts 17 and 18 are driven at different speeds, so that by switching the drive of the spinning rotor 100 to one or the other drive belt 17 or 18, the spinning rotor 100 is also driven at different speeds.
  • the switch lever 506 can be applied with different force with its roller 50 or 51 against the assigned one Drive belts 17 or 18 are pressed, so that these drive belts 17 and 18 respectively abut with different force on the shaft 103 of the spinning rotor 100. Accordingly, the slip between the drive belt 17 or 18 on the one hand and the shaft 103 of the spinning rotor 100 is of different sizes, so that the speed change (speed reduction or speed acceleration) also takes place at different speeds corresponding to this slip.
  • the control of the rotational speed n R of the spinning rotor 100 by controlling the slip can also be carried out with the aid of such a device (with only minor design adjustments) if only a single drive belt 17 and correspondingly only a single control roller 50 are provided, as the speed increases Slip the drive connection between the drive belt 17 and the shaft 103 of the spinning rotor 100 is reduced, so that the spinning rotor 100 is brought to a lower speed n R , while the spinning rotor 100 is accelerated again as the slip becomes smaller.
  • the means for reducing the rotor speed, for re-accelerating the rotor speed and for appending the rotor speed to the production speed are formed by the - in this case only one-armed - changeover lever 5.
  • FIG. 15 An embodiment of a similar device is shown in FIG. 15.
  • a two-armed roller lever 504 is provided, which has a control roller 50 at the end of its one arm 500.
  • a tension spring 550 engages, the other end of which is anchored at a stationary point on the machine frame.
  • a brake lever 562 is also provided, which is pivotably mounted on a pivot axis 563 independently of the changeover lever 506.
  • the brake lever 562 carries a brake pad 561, which can be brought to bear against the shaft 103 of the spinning rotor 100. To control the brake lever 562, this is connected to the control linkage 57.
  • the brake lever 562 extends substantially parallel to the roller lever 504, the pivot axis 563 being located with respect to the pivot bearing 54 of the roller lever 504 on the side on which the control roller 50 is also located, while the control linkage 57 is on the side of the switch lever 506 with the arm 503.
  • the brake lever 562 carries a stop 564 which, when it hits a stop 505 on the arm 503 or on the arm 503 itself, pivots the roller lever 504 against the action of the tension spring 550.
  • the control roller 50 is pressed more or less strongly against the drive belt 17, so that due to the thereby controlled different slippage between the drive belt 17 and shaft 103, the spinning rotor 100 also differs is accelerated.
  • the tension spring 550 causes the control roller 50 to engage the drive belt 17 and press it against the shaft 103 of the spinning rotor 100.
  • the tension springs 550 and 551 can be replaced by other springs, such as compression springs, or by suitable hydraulic or pneumatic means. It is according to the This elastic means can also be arranged to provide a single-armed roller lever (not shown) instead of a two-armed roller lever 504.
  • a controllable damping device 6 is assigned to the brake lever 562 and roller lever 504 instead of a tension spring 551 or another elastic coupling member.
  • the damping device 6 can in principle be designed differently. 16, a plate spring 60 is arranged on the pivot axis 540, with the aid of which the roller lever 504 (or possibly the switch lever 506 - see FIGS. 8 and 12) is axially immovably mounted on the pivot bearing 54.
  • a rod 61 which carries a fork 610, is provided, movable parallel to the pivot axis 540.
  • the fork 610 engages around the pivot axis 540 formed by a bolt and exerts a pressure on the plate spring 60, which is supported on the roller lever 504 (or on the switching lever 506), from its position relative to the roller lever 504 (or the switching lever 506 ) depends.
  • the greater the pressure the greater the preload of the plate spring 60 and thus the greater the damping effect of the damping device 6.
  • damping device 6 has the task of making the roller lever 504 or the changeover lever 506 sluggish in order to prevent a slight imbalance in the spinning rotor 100 from increasing wear of the roller lever 504 or of the switching lever 506 and its storage leads.
  • a damping device 6, if controllable, offers the possibility of being able to control the run-up behavior of the spinning rotor 100. If the roller lever 504 or the changeover lever 506 is released by the brake lever 562, it only follows the force exerted by the tension spring 550 (or by another suitable elastic element) as a function of the preload of the plate spring 60.
  • the loading element which is designed as a fork 610 in the exemplary embodiment described above, can naturally take different forms. It is conceivable to preload the plate spring 60 with the aid of a stepping motor (not shown).
  • the damping element 6 can also be designed differently, for example as a controllable bypass line (not shown) of a hydraulic or pneumatic piston, the damping depending on the degree of opening of this bypass line.
  • the switch lever 506 is in turn centered on a pivot bearing 54.
  • a pressure spring 55 is associated with the arm 500 of the control lever carrying the control roller 50 and is supported in a suitable manner on the frame 191 of the open-end spinning machine 1.
  • the compression spring 55 thus has the effect that, as a rule, the control roller 50 holds the drive belt 17 in contact with the shaft 103 of the spinning rotor 100.
  • the arm 500 of the switch lever 506 carries a stop 501 against which a stop 560 of a brake lever 56 can be brought into contact.
  • the brake lever 56 is arranged together with the control roller 50 on a common axis 502. At its free end, the brake lever 56 is connected to a control link 57.
  • the brake lever 56 carries a brake with a brake pad 561, which is lifted off the shaft 103 of the spinning rotor 100 in the position of the brake lever 56 shown.
  • the brake pad 561 comes to rest against the shaft 103, so that the spinning rotor 100 is braked.
  • the control roller 50 is lifted off the drive belt 17 so that the drive belt 17 is lifted off the shaft 103 of the spinning rotor 100 by the support rollers 19 and 190 (see FIG. 12).
  • FIG. 9 shows the device for controlling the spinning rotor 100 shown in FIG. 8 in a side view.
  • the spinning rotor 100 is included With the aid of support disks 104, only one of which is shown in FIG. 9, and an axial / radial bearing 105.
  • the control linkage 57 has a two-armed lever 570 which is pivotable about a bearing 571. At the free end, the lever has a roller 572, which is surrounded by a fork 58.
  • the fork 58 sits at the end of an angle lever 580, the free end 581 of which is mounted in a slot in the cover 13.
  • position I which represents the spinning position and in which it is shown
  • the free end can also assume a position II in which the brake pad 561 (FIG.
  • the free end of the angle lever 580 can also assume a position III in which the roller 51 presses the drive belt 18 against the shaft 103 of the spinning rotor 100.
  • the lever movement is controlled by a drive device 24 which can be advanced to the angle lever 580, which is arranged on the maintenance device 2 and is controlled by the control device 20.
  • Fig. 9 clearly shows that by shifting the position III, the indentation depth of the control roller 50 and 51 relative to the drive belt 17 and 18 can be changed.
  • the drive device 24 can be assigned a stop (not shown) on the cover 13, against which a counter-stop is supported during its actuating movement, which counter-stop is arranged with the drive device 24 or one arranged thereon Actuator is connected.
  • Such an adjustable stop does not need to work with the drive device 24, but can also - depending on the design of the belt pressing device - the switch lever 506 (see serving as setting device 59, 590 serving adjustable stops in Fig. 12), its control linkage 57 or else Angle lever 580 must be assigned.
  • the stop (not shown) can also determine either the maximum or the minimum contact pressure. The setting can be done manually or - to adapt to different desired rotor speed - make changes automatically, as will be described in more detail later.
  • the switch lever 506 with the associated control elements thus forms a belt pressing device 5, with which the contact pressure between the drive belt 17 or 18 and the shaft 103 of the spinning rotor 100 can be controlled in a desired manner to control the speed n R of the spinning rotor.
  • each or only one of the arms 500 and 503 can be brought into effect as part of the belt pressing device.
  • the control linkage 574 is connected to an angle lever 575, which is pivotably supported by means of a bearing 576.
  • the angle lever 575 is arranged in a slot next to the angle lever 580 in the top 13.
  • the arrangement of the change-over lever 506 and the parts directly or indirectly assigned to it were shown rotated by 90 ° in FIG. 13 only for illustrative reasons.
  • the angle lever 575 also does not correspond to the actual installation conditions.
  • the speed n R of the spinning rotor 100 can thus be reduced, possibly also with a simultaneous reduction in the speed n R of the spinning rotor 100 by controlling the slip between the drive belt 17 or 18 and the shaft 103
  • a strong speed reduction can be particularly advantageous in the first phase of a multi-phase speed reduction.
  • the brake lever 562 has a guide 565 through which a pin of the control linkage 57 is passed.
  • a stop 577 is axially immovably arranged on this bolt of the control linkage 57 in order to bring about an inevitable entrainment of the brake lever 562 when moving away from the roller lever 504 or changeover lever 506 - ie in the lifting direction .
  • the bolt of the shift linkage 57 likewise carries a stop 578, which is, however, arranged at a distance from the guide 565.
  • a compression spring 579 is provided between this guide 565 and the stop 578.
  • the device described can also be combined with a damping device 6 (according to FIG. 16) or a tension spring 551 between roller lever 504 or switch lever 5 on the one hand and brake lever 562 on the other hand, so that both the braking and the starting behavior of the spinning rotor 100 are precisely controlled can.
  • the described method and also the described device can be modified in a variety of ways within the scope of the present invention, for example by combining individual features by means of equivalents or by another combination.
  • the piecing process and thus also the times to be observed, speed deceleration and acceleration as well as the acceleration of the thread take-off can be controlled in various ways, for example by specifying or setting appropriate times.
  • the rotor speed can be controlled depending on the thread take-off speed.
  • the rotor speed is reduced to the same percentage of the thread take-off speed (speed V A ) and then accelerated again to achieve a constant rotation, which corresponds to that during the spinning conditions, in synchronism with the thread take-off speed. 11 that the speed V A of the device by which the thread 30 is drawn off from the open-end spinning device 10 after piecing is monitored.
  • control device 4 (usually with the control device 20 interposed on the maintenance device 2 - See Fig. 10) connected to the drive motor 212 for the auxiliary drive roller 211.
  • FIG. 11 Such a device is shown in FIG. 11, which is directly controlled without the interposition of a service vehicle 2, as is e.g. is or can be the case with individual test devices.
  • the control device 4 is connected via a line 41 to the drive motor 212 in order to give it the control pulses required for starting and starting up.
  • the speed of the drive motor 212 is scanned via a tachometer generator 213, which scans, for example, the extended axis of the drive motor 212.
  • a drive wheel 214 sits on this axis, which is connected via a chain or a belt 215 to a further drive wheel, on the axis of which the auxiliary drive roller 211 is arranged.
  • the tachometer generator 213 is connected via a line 42 to a means 43 of the control device 4, which compares the electrical quantity generated with the aid of the tachometer generator with the quantity that the auxiliary drive roller 211 would reach after reaching its desired speed, and calculates from this for the value determined by the tachometer generator 213 from the corresponding percentage value.
  • the shaft 103 of the spinning rotor 100 is assigned a tachogenerator 106, which is connected via a line 44 to a means 45 of the control device 4, which likewise how the means 43 calculates the percentage value of the current speed n R of the spinning rotor 100 by comparing the actual speed with the target speed.
  • the percentage converted measurement values of the thread take-off speed and the rotor speed by the two means 43 and 45 for converting the measurement values into percentage values are supplied via lines 430 and 450 comparison means 46, where it is checked whether the two percentage values are in agreement.
  • the comparison means are connected via a line 481 to the input of a comparison device 48, the other input of which is connected to the control device 4 via a line 480.
  • the drive of the spinning rotor 100 is designed as an individual drive motor 107, which is connected to the comparison device 48 via a line 482.
  • the control device 4 gives control impulses to the drive motor 212 via the line 41 during the spinning, which then drives the spool 162 accordingly via the auxiliary drive roller 211 and with the aid of this spool 162 pulls the thread 30 out of the spinning rotor 100.
  • the draw-off roller pair 14 is open here, so that the piecing draw-off takes place solely through the coil 162.
  • the tachometer generator 213 supplies corresponding pulses via the line 42 to the means 43 of the control device 4, which convert the measured values obtained from the tachometer generator 213 into percent values.
  • the preset full thread take-off speed serves as the reference value.
  • the control device 4 via the comparison device 48, prevents a control pulse output via a line 482 to the drive of the spinning rotor 100, for example an individual drive motor 107.
  • the comparison means 46 gives a corresponding pulse to the means 48 via the line 481. This has the effect that the speed reduction that was previously achieved by the Line 480 was initiated, is terminated by giving a corresponding control pulse to the individual drive motor 107 via line 482.
  • the rotor is now started up in the manner specified by the control device 4.
  • the thread 30 is brought under the lifted take-off roller 141 and then the draw-off roller 141 is lowered onto the driven take-off roller 140 in a known manner or the thread 30 is inserted into the pair of draw-off rollers 14 in a different way, so that subsequently Deduction takes place through this pair of draw rollers 14.
  • the auxiliary drive roller 211 is lifted off the spool 162, which is now brought into contact with the driven winding roller 160.
  • the speeds or speeds can be monitored directly or indirectly.
  • the thread take-off speed was indirectly monitored directly via the speed of the drive motor 212 and the speed n R of the spinning rotor 100.
  • the described device for scanning the rotor speed can also be used when the change from speed reduction to speed acceleration depending on reaching a predetermined minimum value of the speed n R of the spinning rotor 100 is to take place, without any adjustment to the Startup of the speed V A of the thread take-off must be provided.
  • the means for reducing the speed n R of the spinning rotor 100 can be formed by the control device 20, which initiates and controls the speed reduction, for example.
  • the means for re-acceleration can be formed jointly by the control devices 4 and 20 by the control device 4 after response of the tachometer generator 106 initiates the rotor run-up, which is then controlled by the control device 4.
  • the means for attaching the rotor speed to the production speed is then formed by the control device 4 alone, which prevents further acceleration when the predetermined operating or production speed has been reached.
  • the acceleration of the spinning rotor 100 following this speed reduction is to be adapted to the acceleration of the thread take-off, that after the reduction in the rotor speed has ended, control impulses are given to the individual drive motor 107 via line 47, which cause the spinning rotor 100 to run up adapt to the acceleration of the thread take-off, ie regulate so that this run-up is proportional to the run-up of the thread take-off, ie in such a way that the rotor run-up - in percent - matches the run-up of the speed V A of the thread take-off.
  • the thread take-off speed is monitored for the entire duration of its acceleration.
  • the change in rotor speed takes place from the point in time at which the speed n R of the spinning rotor 100 reaches the same percentage of the operating speed as the thread take-off until the point in time at which the rotor speed and thread take-off - together - reach the full production values, synchronously with the increase in the thread take-off speed V A.
  • control device 4 can also be assigned a generator (not shown), which is used for control of the rotor run-up generates corresponding electrical values which can be adapted to the thread run-up, if desired.
  • FIGS. 6a) to 6c) show the clamping line K, in which the delivery device is at a standstill 11 the sliver 3 is held clamped. In the device shown in FIG. 10, the delivery roller 110 for stopping the sliver 3 is not controlled.
  • the clamping line K is formed here by the line on which the clamping lever 113 presses the sliver 3 against the feed trough 111.
  • the electromagnet 114 and the clamping lever 113 can also be omitted and instead the delivery roller 110 be assigned a clutch, not shown.
  • the clamping line K is formed by the line in which the feed trough 110 presses the sliver 3 against the delivery roller 110.
  • a line A is also shown in FIGS. 6a) to 6c), which symbolizes the boundary of the working area of the opening roller 121 (see FIG. 10).
  • the fiber beard 34 looks similar with a short downtime of the delivery device 11.
  • the delivery device 11 If the delivery device 11 is idle for a longer period of time and the opening roller 121 continues to run, the latter continues to comb fibers 31 out of the fiber beard 34.
  • the fiber beard then has only a few fibers 31 which extend beyond line A (FIG. 6b)).
  • the longer the standstill time of the delivery device 11 (always with the opening roller 121 continuing to run), the shorter the fiber beard 34 becomes until there are no longer fibers 31 during a long standstill time protrude into the working area of the opening roller 121, ie until the longest fibers 31 extend from the clamping line K at most to the line A (FIG. 6c)).
  • the fiber beard 34 has practically the same shape as during the spinning process itself.
  • t Va which is caused by the time required to generate a fiber stream again between the delivery device 11 and the spinning rotor 100
  • the fiber feed ie the fiber stream arriving on the fiber collecting surface 102 of the spinning rotor 100, runs back on it full value high (100% - see ramp-up time t Fa ). This is shown in Fig. 7a), where the fiber feed F is shown as a strong, uninterrupted line.
  • the thread draw (see speed V A ) must be adapted to the effective fiber feed F. It follows from this that the control of the speed n R of the spinning rotor 100 must also be controlled differently depending on the downtime t Sa , t Sb or t Sc . This applies both to the reduction in the speed n R and the later re-acceleration of the rotor speed.
  • the duration of the downtime is determined in the control device 4 from the time at which the thread monitor 15 (see FIG. 10) responds and the time at which the control device 4 gives a pulse to the control device 20 after the maintenance device 2 on the has reached the spinning position concerned, so that the maintenance device 2 now begins the piecing process.
  • the control device 20 of the maintenance device 2 can also give a corresponding impulse to the control device 4, by means of which the end time of the downtime is determined, since the time t L for switching on the delivery device 11 at a fixed time interval of this switch-on time of the piecing device.
  • the switching on and acceleration of the thread take-off are then controlled in accordance with the measured time - and correspondingly also the speed n R of the spinning rotor 100, the speed control not necessarily having to be synchronous with the control of the thread take-off speed, if not the rotation in the thread 30, but the thread tension even after deduction of the piecing 32 from the spinning rotor 100 is still of particular importance.
  • the longer the idle time t Sa , t Sb or t Sc the later the fiber flow F starts in the spinning rotor and the later the thread take-off must also start.
  • the run-up curve of the fiber flow is also flatter with a longer standstill time, so that the run-up curve of the thread take-off must also be flatter.
  • the determination of the condition of the fiber beard does not need to be done indirectly by measuring the downtime, but can also be done directly, for example by measuring the air resistance of the fiber beard.
  • the corresponding device with which the combed state of the fiber beard is determined is in a suitable tax-related connection with the control device 4 and / or 20 so that it can then control the thread take-off and the rotor speed in an adapted manner.
  • the spinning rotor 100 can be controlled in its speed n R in various ways. In this way, the slip of its drive (see FIGS. 8, 9, 10 and 12 - possibly also by interposing a torque or slip clutch) can be controlled.
  • the spinning rotor 100 can also be braked with the aid of a controllable brake (see FIGS. 8 and 13) while the central drive continues or can be accelerated again in a controlled manner. It is also possible to provide a single drive motor 107 (see FIG. 11) for controlling the spinning rotor 100.
  • the speed of the spinning rotor 100 can also be monitored for a control of the speed behavior when the spinning rotor 100 is controlled by slip.
  • a main drive which drives the spinning rotors 100 of a plurality of adjacent spinning stations at production speed, while an auxiliary drive is provided for thread break removal, with which the spinning rotor 100 is always coupled to only a single spinning station for the duration of the piecing becomes.
  • the two drives can be designed as belts or shafts etc.
  • the two drives are connected to the control device 4 for controlling the coupling and uncoupling.
  • the speed of the auxiliary drive is controlled by the control device 4 during piecing in such a way that the spinning rotor 100 is first reduced in its speed n R and is accelerated again to the full production speed at the desired point in time.
  • the thread tension S F in the spun thread 30 can be monitored during the piecing, which can be done with the aid of the thread monitor 15 designed as a thread tension monitor or an additional thread tension monitor (not shown). If the determined thread tension deviates from the target tension more than is considered tolerable, the control device 4 is sent a corresponding signal. This causes the speed n R of the spinning rotor to be controlled accordingly in the subsequent piecing process, for example according to FIG. 5, so that the thread tension deviations become smaller or disappear.
  • a value can be entered into the control device 4 by hand as a reference value.
  • the control device 4 can also contain means which measures the thread tension during normal spinning operation and stores the average value of the measured thread tension values as a reference value for the comparison of the thread tensions occurring during piecing.
  • Such control of the rotor speed change can be carried out electronically (e.g. in the case of a single drive motor 107) or mechanically with the aid of a stop (not shown) (for example with the aid of a belt pressure device).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
EP90105901A 1989-05-05 1990-03-28 Verfahren und Vorrichtung zum Anspinnen eines Fadens an einer mit einem Spinnrotor arbeitenden Offenend-Spinnvorrichtung Expired - Lifetime EP0395880B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3914752 1989-05-05
DE3914752 1989-05-05
DE3936748 1989-11-04
DE3936748A DE3936748A1 (de) 1989-05-05 1989-11-04 Verfahren und vorrichtung zum anspinnen eines fadens an einer mit einem spinnrotor arbeitenden offenend-spinnvorrichtung

Publications (2)

Publication Number Publication Date
EP0395880A1 EP0395880A1 (de) 1990-11-07
EP0395880B1 true EP0395880B1 (de) 1995-02-15

Family

ID=25880579

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90105901A Expired - Lifetime EP0395880B1 (de) 1989-05-05 1990-03-28 Verfahren und Vorrichtung zum Anspinnen eines Fadens an einer mit einem Spinnrotor arbeitenden Offenend-Spinnvorrichtung

Country Status (4)

Country Link
US (1) US5152132A (cs)
EP (1) EP0395880B1 (cs)
CZ (1) CZ283326B6 (cs)
DE (2) DE3936748A1 (cs)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4219278A1 (de) * 1991-07-27 1993-01-28 Schubert & Salzer Maschinen Verfahren und vorrichtung zur reduzierung des energieverbrauchs beim betrieb von spinnelementen
DE19923047A1 (de) * 1999-05-20 2000-11-23 Rieter Ingolstadt Spinnerei Verfahren und Vorrichtung zur Steuerung einer Komponente einer eine Vielzahl gleichartiger Arbeitstellen nebeneinander aufweisenden Textilmaschine
DE10062937B4 (de) * 2000-12-16 2012-03-29 Rieter Ingolstadt Gmbh Verfahren und Vorrichtung zum Antreiben einer Spule in einer Offenend-Spinnvorrichtung und Hilfsantriebsrolle hierfür
CZ292067B6 (cs) * 2001-04-27 2003-07-16 Rieter Cz A. S. Způsob a zařízení k zapřádání příze na bezvřetenových dopřádacích strojích
CZ299541B6 (cs) * 2001-10-11 2008-08-27 Oerlikon Czech S.R.O. Zpusob zaprádání na bezvretenových doprádacích strojích a zarízení k jeho provádení
DE102004040214A1 (de) * 2004-08-19 2006-03-02 Maschinenfabrik Rieter Ag Textilmaschine und Verfahren zur Ansetzeroptimierung
NZ552416A (en) * 2006-12-22 2009-07-31 Summit Wool Spinners Ltd Self twisting yarn production with speed control of take-up holder
DE102015117204A1 (de) * 2015-10-08 2017-04-13 Rieter Ingolstadt Gmbh Verfahren zum Vorbereiten eines Garnendes zum Anspinnen an einer Rotorspinnvorrichtung einer Rotorspinnmaschine sowie Rotorspinnmaschine
DE102016109682A1 (de) * 2016-05-25 2017-11-30 Rieter Ingolstadt Gmbh Verfahren zum Anspinnen eines Fadens in einer Offenend-Spinnvorrichtung
EP3260584B1 (de) * 2016-06-15 2021-10-27 Rieter Ingolstadt GmbH Verfahren zum optimieren der produktion einer rotorspinnmaschine

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2115180B1 (cs) * 1970-11-28 1974-06-07 Schubert & Salzer Maschinen
DE2321775C3 (de) * 1973-04-30 1979-07-05 Fritz 7341 Bad Ueberkingen Stahlecker Längs einer Offenendspinnmaschine verfahrbare Vorrichtung zum Anspinnen
JPS5059532A (cs) * 1973-09-29 1975-05-22
DE2341528B2 (de) * 1973-08-16 1977-08-11 Stahlecker, Fritz, 7341 Bad Über kingen, Stahlecker, Hans, 7334 Süßen Verfahren zum anspinnen eines fadens bei einem offenend-spinnaggregat
USRE30201E (en) * 1973-12-04 1980-02-05 Method and apparatus for start-spinning a thread on an open-end spinning unit of an open-end spinning machine
DE2458042C2 (de) * 1974-12-07 1985-06-05 Stahlecker, Fritz, 7347 Bad Überkingen Offenend-Spinnmaschine mit einer Vielzahl von Spinnstellen und einem verfahrbaren Wartungsgerät zum Anspinnen nach einem Fadenbruch
DE2507199C2 (de) * 1975-02-20 1986-01-30 W. Schlafhorst & Co, 4050 Mönchengladbach Vorrichtung zum Steuern des Anspinnvorgangs bei Rotor-Spinnmaschinen
DE2605978C2 (de) * 1976-02-14 1986-06-05 W. Schlafhorst & Co, 4050 Mönchengladbach Vorrichtung zum Steuern des Anspinnvorgangs bei Rotor-Spinnmaschinen
DE2754785A1 (de) * 1976-12-10 1978-07-27 Nuova San Giorgio Spa Verfahren und vorrichtung zum wiederverbinden der faeden in offenend-spinnmaschinen
JPS55128026A (en) * 1979-03-22 1980-10-03 Toyoda Autom Loom Works Ltd Starting method of open-end fine spinning frame and device therefor
DE3023959C2 (de) * 1980-06-26 1986-06-26 Schubert & Salzer Maschinenfabrik Ag, 8070 Ingolstadt Verfahren und Vorrichtung zum Anspinnen eines Fadens in einem Spinnrotor einer Offenend-Spinnvorrichtung
DE3144760C2 (de) * 1981-11-11 1989-06-08 W. Schlafhorst & Co, 4050 Mönchengladbach Verfahren und Vorrichtung zum Steuern des Anspinnvorgangs bei einer Offenend-Rotorspinnmaschine
DE3144761C2 (de) * 1981-11-11 1994-04-07 Schlafhorst & Co W Verfahren und Vorrichtung zum Steuern des Anspinnvorgangs bei einer Offenend-Rotorspinnmaschine
DE3144776C2 (de) * 1981-11-11 1986-09-25 W. Schlafhorst & Co, 4050 Mönchengladbach Verfahren und Vorrichtung zum Steuern des Anspinnvorgangs bei einer Offenend-Rotorspinnmaschine
DE3202428C2 (de) * 1982-01-26 1986-06-05 Schubert & Salzer Maschinenfabrik Ag, 8070 Ingolstadt Verfahren und Vorrichtung zum Anspinnen eines Fadens in einer Offenend-Spinnvorrichtung
DE3447428A1 (de) * 1984-12-24 1986-07-03 Schubert & Salzer Maschinenfabrik Ag, 8070 Ingolstadt Vorrichtung zum anspinnen eines fadens an einer spinnstelle einer offenend-spinnmaschine
DE3516120C2 (de) * 1985-05-04 1993-10-28 Fritz Stahlecker Verfahren zum automatischen Anspinnen und automatische Anspinnvorrichtung
DE3719676C1 (de) * 1987-06-12 1988-09-29 Schubert & Salzer Maschinen Steuervorrichtung zum Antreiben und Stillsetzen eines Offenend-Spinnelementes

Also Published As

Publication number Publication date
DE59008455D1 (de) 1995-03-23
CZ283326B6 (cs) 1998-02-18
US5152132A (en) 1992-10-06
DE3936748A1 (de) 1990-11-08
CS9002225A2 (en) 1991-12-17
EP0395880A1 (de) 1990-11-07

Similar Documents

Publication Publication Date Title
DE2725105C3 (de) Verfahren zum Durchführen eines Anspinnvorganges und Vorrichtung zum Durchführen des Verfahrens
EP0528884B1 (de) Verfahren und vorrichtung zum automatischen anlegen eines faserbandes an einer textilmaschine
EP0274016B2 (de) Verfahren und Vorrichtung zum Anspinnen einer Offenend-Spinnvorrichtung
DE2544209C2 (de) Verfahren zum Anspinnen einzelner Spinnaggregate einer eine Vielzahl von Spinnaggregaten aufweisenden OE-Spinnmaschine
EP2122022B1 (de) Ringspinnmaschine mit vorrichtung zum zuführen von flammen
DE2321775C3 (de) Längs einer Offenendspinnmaschine verfahrbare Vorrichtung zum Anspinnen
EP0395880B1 (de) Verfahren und Vorrichtung zum Anspinnen eines Fadens an einer mit einem Spinnrotor arbeitenden Offenend-Spinnvorrichtung
EP0165511A2 (de) Vorrichtung zum Aufwinden eines mit konstanter Geschwindigkeit zugeführten Fadens auf eine Kreuzspule
DE3338833A1 (de) Verfahren und vorrichtung zum anspinnen eines garnes an einem spinnaggregat einer oe-friktions-spinnmaschine
DE2620806A1 (de) Laengs einer offenend-spinnmaschine verfahrbare vorrichtung zum anspinnen
EP0381995B1 (de) Verfahren und Vorrichtung zum Anspinnen einer Offenend-Spinnvorrichtung
DE2313788A1 (de) Verfahren zum selbsttaetigen anfahren und abstellen einer offen-end-spinnmaschine
EP0415952B1 (de) Verfahren und vorrichtung zum anspinnen einer offenend-spinnvorrichtung
WO1986003792A1 (fr) Metier a filer open-end possedant une pluralite de points de filature, dont les elements de filature sont entraines conjointement par un entrainement commun, et un procede pour le raccordement des fils
DE2708936C2 (de) Verfahren und Vorrichtung zum Anspinnen eines Fadens an Spinnaggregaten einer Offenend-Spinnmaschine
DE10037513B4 (de) Verfahren zum Steuern einer Ringspinnmaschine und Spinnmaschine
DE4321440C2 (de) Verfahren und Vorrichtung zum Anspinnen einer Offenend-Spinnvorrichtung
DE2558419A1 (de) Offen-end-spinnvorrichtung
DE3918946A1 (de) Vorrichtung und verfahren zum anspinnen eines fadens an einer offenend-spinnvorrichtung
EP0531507A1 (de) Verfahren und vorrichtung zum anspinnen eines fadens in einer offenend-spinnvorrichtung
DE3246993C2 (de) Verfahren und Vorrichtung zum Anspinnen einer Offenend-Spinnvorrichtung
EP4442626A1 (de) Fadenchangiereinrichtung, textilmaschine und verfahren
DE2760369C2 (cs)
CH691482A5 (de) Vorspinnmaschine.
DE10108502A1 (de) Verfahren und Vorrichtung zur Herstellung eines Fadens in einer Offenend-Spinnvorrichtung

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19900328

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): CH DE FR GB IT LI

ITCL It: translation for ep claims filed

Representative=s name: ZINI MARANESI

GBC Gb: translation of claims filed (gb section 78(7)/1977)
EL Fr: translation of claims filed
17Q First examination report despatched

Effective date: 19920902

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: RIETER INGOLSTADT SPINNEREIMASCHINENBAU AKTIENGESE

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CH DE FR GB IT LI

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19950215

Ref country code: FR

Effective date: 19950215

ITF It: translation for a ep patent filed
REF Corresponds to:

Ref document number: 59008455

Country of ref document: DE

Date of ref document: 19950323

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19950331

Ref country code: CH

Effective date: 19950331

EN Fr: translation not filed
GBV Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed]

Effective date: 19950215

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19980430

Year of fee payment: 9

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20000101

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050328