EP1218577B1 - Device for clamping a lower screw thread of a spindle of a textile machine, in particular a ring spinning machine - Google Patents

Description

The invention relates to a device for clamping a Unterwindefadens on a spindle of a textile machine, in particular a Ring spinning machine, the device below one on the spindle plugged Kopses a fixedly connected to the spindle clamping ring and one on the spindle between one through a collar on the spindle defined open position - and one defined by the clamping ring Has closed position axially displaceable clamping sleeve which by means of actuating device is movable using magnetic means.

Textile machines, in particular ring spinning machines, which are equipped with automatic Doffvorrichtungen are subject to spin programs with special program phases. Such a program phase provides For example, the spinning out. During this spinning are Upper, rear and Unterwindungen executed.

In the execution of underwindings, the thread is below the Undercurricular crown in the area of a device for clamping a Unterwindefadens on a spindle (underwinding area) out, which is located below the winding tube. The underwinding thread wraps around the Spindle preferably less than 360 °.

Subsequently, the finished bobbin when doffing from the spindle shaft withdrawn by means of automatic bobbin changing devices, wherein the Thread between coil and whorl torn off or cut. Of the Thread between whorl and ring traveler, however, remains intact.

During subsequent piecing, the ring rail is raised again, so that the thread overlaps the underwinding crown and corresponding windings can be placed on a new winding tube again. The Main spiders can now begin.

After a sufficient number of turns on the new winding tube are wound up, the Klemmwirkverbindung to a possible open at any time and the thread end located therein moved outward by centrifugal forces.

As prior art is already a device for clamping a Unterwindefadens on a spindle known (DE 199 04 793). Here is the Clamping sleeve pressed by spring force in the closed position and by a fixedly arranged actuator in the open position emotional. Alternatively, there is the possibility that the cancellation of the clamping active connection can be done via a mobile actuator.

This known design has the disadvantage that during the entire Period of time in which the clamping device in the open position is, the aforementioned actuator touch this clamping device got to. If this process is to be done while the spindles are running, then Further and costly measures against wear at the point of contact required and there is a not inconsiderable loss of energy.

EP 0 292 856 B1 has disclosed a similar clamping device. Below a fixedly connected to the spindle clamping ring on the spindle axially movable clamping sleeve is arranged, define the upper end side together with the lower end face of the clamping ring the nip. In the lower region of the clamping sleeve elastically deformable support elements are arranged by centrifugal force to the outside. These support elements, together with a conical ring attached to the spindle, cause the collet to be lowered down at high rotational speeds of the spindle. If the speed drops, these support elements push the clamping sleeve back up into the closed position as a result of its elastic prestressing. It is mentioned that in the closed position magnetic force should additionally act. How this should happen is not described.
This type of control of the closing function for the nip is not suitable for controlling the clamping operation on the spindle. The applied in the closed position clamping force on the connecting thread is sufficient especially when winding Begin n of the new coil, where the centrifugal force is already effective again, not sure to fix the thread end for the start of winding safely.

EP 0 775 769 A1 has disclosed a device which is intended to clamp the underwinding thread in an angular range of less than 360 °. This device also has a clamping ring which is fixedly connected to the spindle and a clamping sleeve axially displaceable on the spindle. Both elements together form a conical, closable clamping gap, which should be kept closed self-locking.
The clamping sleeve is held in the lower position during the spinning process by its own weight and is supported on a corresponding collar on the spindle. During this time, the nip is opened.
On the outside of the clamping sleeve annular coils are arranged. At the bottom of these bundles or one of these Federal is based on a vertically movable actuator, which can be raised and lowered by means of pneumatic or magnetic actuators.
During the bobbin change, the clamping sleeve is held by the named actuator. It has been shown that due to the vibrations during the bobbin change in the presence of the connecting thread in the nip, the self-locking is not reliably effective.
The connecting thread is released during the bobbin change and the winding of the bobbin can not begin. To prevent this error, the actuator is activated in particular during the Bewicklungsbeginnes on the new coil to fix the clamping sleeve in the closed position. Given the large number of spindles requires a considerable amount of energy. The friction between the actuator or the actuating element on the one hand and the clamping sleeves on the other hand causes considerable heating and wear.

Accordingly, the present invention, the object of a Device of the type mentioned above to be designed so that the clamping sleeve without mechanical contact with the actuating element in the closing and / or open position is reliably locked. In particular, it should be guaranteed be that at all spinning stations of the spinning machine the Wrapping after a bobbin changing operation on the new bobbin tubes can start reliably.

This object is achieved in that the clamping sleeve is held by at least one magnetic element integrated in it either in the closed position defined by the clamping ring or in the open position defined by the federal government. With the aid of the magnetic force thus provided, therefore, the clamping sleeve is fixed in at least one of the two positions, so that no mechanical contact must be present through an actuating device.
A surprising advantage of the magnetic clamping device is that the magnetic force increases during the closing of the device and reaches its maximum value in the closed position, while a possibly existing spring force of the actuator decreases and assumes a minimum value in the closed position.

The actuator is only for the respective switching of the Clamping sleeve between the open position and the closed position responsible.

In the closed position and / or in the open position holds over the relevant Magnetic element, the clamping sleeve flawless and reliable.

A particularly advantageous embodiment describes claim 2, wherein the clamping sleeve is also rotatable about the spindle axis and the respective closing or open position is ensured by different from each other positionable poles of the magnets.
After this movement, the magnet pairs of the clamping sleeve and the clamping ring act together and thus keep the clamping sleeve reliable in the closed position or in the open position. Stand opposite poles, they repel each other. By contrast, poles of the same name cling to each other when they are close enough to each other.
According to a further refinement of claim 2 further embodiment of the invention - described in claim 3 - the axially rotatable clamping sleeve on the top side at least two unlike magnetic poles with alternating sequence south pole / north pole, wherein the clamping ring is provided with at least one homonymous magnet pair. In this case, the clamping sleeve can be axially rotatable by at least one actuating element and can be moved from the open position into the closed position and vice versa.
With the embodiment according to claim 4, it is possible to further increase the holding force for the clamping sleeve in the respective closed or open position.

Alternatively, according to claim 5, the following possibility: In the clamping sleeve there is a single magnet. This is the clamping sleeve either to the clamping ring or to the opening position defining Pulled the bunch. In the clamping ring and in the collar is also one magnet each. These two magnets are arranged offset by 180 ° and polgleich the magnet in the clamping sleeve, so that these by rotation each between the areas of action of the two magnets and can be switched and while the clamping sleeve changes position.

In a further embodiment of the preceding embodiment, the by at least one actuating element axially rotatable clamping sleeve also on the underside at least two unlike magnet pairs with alternating Episode South Pole / North Pole, with a lower, connected to the spindle, the open position defining covenant with at least one is provided with the same pair of magnets. This gives you the opportunity that the clamping sleeve in the open position on the interaction the magnet pairs are held or repelled.

A further embodiment provides that the at least one pair of magnets in the clamping sleeve cooperates with a single magnet in the clamping ring and / or in the collar defining the open position.
The magnets or magnet pairs may be bar magnets.

An advantage of the arrangement according to claim 7 is that the electromagnet from a mobile device, for example a hiking cleaner, at already running spindles at any time can be switched and that at the same time also if necessary accumulating thread remnants can be disposed of.

Fig. 1

eine schematische Seitenansicht einer Spinnstelle mit Spindelbank, Spindellager, Unterwindekrone und Faden sowie mit Vorrichtung zum Klemmen eines Unterwindefadens;

Fig. 2

eine vergrößerte Darstellung der erfindungsgemäßen Vorrichtung in Schließstellung;

Fig. 3

eine Darstellung analog der nach Figur 2 in Offenstellung;

Fig. 4

eine weitere Auführungsmöglichkeit der Erfindung in teilweiser Schnittansicht mit der Klemmhülse in Schließstellung;

Fig. 5

eine Draufsicht auf eine Gestaltungsgmöglichkeit der ungleichartigen Magnetpaare der Klemmhülse;

The invention will be described in more detail with reference to embodiments shown in the drawing. In the drawing show:

Fig. 1

a schematic side view of a spinning unit with spindle, spindle bearings, underwinding crown and thread and with a device for clamping an underwinding thread;

Fig. 2

an enlarged view of the device according to the invention in the closed position;

Fig. 3

a representation analogous to that of Figure 2 in the open position;

Fig. 4

another Auführungsmöglichkeit the invention in partial sectional view with the clamping sleeve in the closed position;

Fig. 5

a plan view of Gestaltungsgmöglichkeit the dissimilar magnet pairs of the clamping sleeve;

According to FIG. 1, a spinning spindle 1 has a spindle lower part 2, which in FIG a spindle bank 3 is attached. In the spindle lower part 2 is a rotatable Spindle upper part 4 stored. On this spindle upper part 4 is a Sleeve 5 attached, on which a tapered thread 6 to a winding 7 is wound up. The sleeve 5 and the winding 7 form a Kops 8.

The tapered thread 6 is guided by a ring traveler 9, which on rotates a spinning ring 10, which in turn on a movable up and down Ring rail 11 is arranged.

Below the cop 8 is on the spindle upper part 4, a device 12th arranged for clamping a Unterwindefadens to the spindle. These Device 12 has in a first embodiment below the plugged Kopses 8 a fixedly connected to the spindle 1 clamping ring 15th and one on the spindle 1 between an open position I and a Closed position II (see FIGS. 2 and 3) axially displaceable clamping sleeve 20th on. Above the clamping ring 15 is a separating knife 18th

The clamping sleeve 20 is inventively magnetic force by at least a magnetic element 30 in the defined by the clamping ring 15 Closed position 11 held, d. H. the magnetic element 30 and the steel existing clamping ring 15 cooperate.

There is also the possibility that the clamping sleeve 20 by the magnetic element 30 is held in the open position I. This open position I is defined by a lower collar 40, which in turn firmly with the Spindle 1 is connected.

The clamping sleeve 20 can be used as a tubular element with inner and outer ring and individual chambers be designed in the chambers the Magn etelem ent 30 is arranged.

To the clamping sleeve 20 between the open position I and the closed position II to move, the clamping sleeve 20 of FIG. 2 and 3 with an actuator 22 to be displaced. Is the Clamping sleeve 20 of FIG. 2 by means of the magnetic element 30 in the Closed position II or according to FIG. 3 in the open position I, then the actuating device 22 no longer active, so that each one non-contact Position is given.

In the embodiment of FIG. 4, the clamping sleeve 20 'is axially displaceable and additionally axially rotatable. It has the magnetic element 30 ' on, which in this embodiment each with an eponymous Magnet pair 32 of the clamping ring 15 and a like pair of magnets 32 'in the area of the covenant 40' cooperate.

Again, there is the possibility, by providing the eponymous Magnet pairs 32 in the region of the clamping ring 15, the clamping sleeve 20 'in the To keep closed position II, wherein after turning the clamping sleeve 20 'the Magnetic effect reversed and the clamping sleeve 20 'in the open position I. is repelled. Here it can, as stated above, with the help of Magnetic effect of the magnetic elements 30 'and 32' are held.

Instead of the actuator, which the clamping sleeve 20 'axially moves, an actuator is provided, which the clamping sleeve 20 'turns. In this case, the magnetic effect of the magnetic element 30 'be such that in the presence of unlike magnet pairs the Clamping sleeve 20 'raised from the open position I in the closed position II or is lowered.

The magnet pairs used in the aforementioned embodiments For example, according to FIG. 5, they can be shaped magnets. The clamping sleeve 20 ' has here by webs 26 separate chambers, in which this Form magnets are arranged.

The use of magnets according to the invention makes it possible to to ensure within the framework of various design variants that the clamping sleeve 20 or 20 'or 20' '' properly in the closed position II and / or held in the open position I without these end positions a mechanical contact with an actuator is present.

In an alternative, the actuator is merely for moving the clamping sleeve between the open position I and the closed position II. According to another alternative, the magnetic force is measured so that the actuator can be omitted and the clamping sleeve with the help of Magnet pairs both moved and fixed.

LIST OF REFERENCE NUMBERS

1

spinning spindle

2

Spindle base

3

spindle rail

4

Spindle top part

5

shell

6

thread

7

winding

8th

Kops

9

ring rotor

10

spinning ring

11

ring rail

12

Device (for clamping an underwinding thread)

15

clamping ring

18

separating knife

20, 20 ', 20 "'

collet

22

actuator

26

Stege

30, 30 ', 30 "

magnetic element

31 "

magnetic element

32, 32 '

magnet pair

40, 40 '

Federation

I

open position

II

closed position

Claims (7)

1. Device for clamping a lower screw thread of a spindle of a textile machine, in particular a ring spinning machine, whereby the device is placed below the onto the spindle (1) pinned cop (8) consisting of a clamping ring (15) firmly connected to the spindle (1) and a clamping sleeve (20, 20') which can be axially shifted between a position "open" (I) defined by a collar (40, 40') fixed on the spindle (1) and a position "closed" (II) defined by the clamping ring (15) by an actuating device (22) using magnetic means.
   defined in a way,
   that the clamping sleeve (20, 20') is held by at least one magnetic device (30) either in the position "closed" (II) defined by the clamping ring (15) or in the position "open" (I) defined by the collar (40, 40').
2. Device according to claim 1, defined in a way
   that the clamping sleeve (20, 20') is made also rotatable on the spindle (1),
   that the clamping sleeve (20, 20') is equipped with at least one magnetic device (30) with permanent magnets of different polarity (N, S) staggered in direction of rotation on the clamping surface facing the clamping ring (15),
   that the clamping ring (15) is equipped with at least one pair of magnets (32), the poles of which can optionally be allocated to the staggered poles (N, S) of the clamping sleeve (20, 20'), and
   that the actuating device (22) is generating a motion of rotation of the clamping sleeve (20, 20') by means of which the allocation of the poles (N, S) of the clamping sleeve (20, 20') is changeable against the poles (N, S) of the clamping ring (15).
3. Device according to claim 2, defined in a way
   that clamping sleeve (20, 20') rotatable around the axle of the spindle (1) is showing at least two pairs of magnets (30') with poles (N, S) on the surface facing the clamping ring (15) which are designed in alternating sequence as magnetic south or magnetic north, and
   that the clamping ring (15) is equipped with at least one pair of magnets (32), the poles of which can be allocated to the poles of the pairs of magnets (30') of the clamping sleeve (20, 20').
4. Device according to claim 3, defined in a way
   that the collar (40, 40') connected to the spindle (1) and defining the position "open" (I) is equipped with at least one pair of magnets (32') conspiring with the pair of magnets (30') of the clamping sleeve (20, 20').
5. Device according to claim 1 and 2, defined in a way
   that there is one magnet each staggered around the spindle axle by 180° in the clamping ring (15) and in the collar (40, 40'), whereby these magnets are of identic polarity to a magnetic device (30) of the clamping sleeve (20, 20').
6. Device according to one or several claims of 2 - 5, defined in a way
   that magnets are of special shape.
7. Device according to claim 1, defined in a way
   that the actuating device (22) can be activated by a device movable along the row of spindles of the textile machine.

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