EP0319784B1 - Method for automatically exchanging bobbins on a spinning machine - Google Patents

Description

The invention relates to a method for automatically changing the spinning bobbins on a spinning machine which has a large number of spinning positions, each of which contains a drafting device and a spindle which serves to accommodate the spinning bobbins, and a bell which is coaxial with the spindle and spans the spindle.

It is to be expected that spinning machines with spinning positions corresponding to the type mentioned at the beginning will work at about three times the speed compared to ring spinning machines. This means that the spinning bobbins or bobbins are filled correspondingly much faster, and that the spinning bobbins or bobbins have to be changed correspondingly more frequently.

The invention has for its object to provide a method for changing the spinning bobbins on a spinning machine of the type mentioned, which can be carried out quickly and reliably and which can be realized with the help of simple constructions.

This object is achieved by interrupting the spinning process without breaking the thread, then moving the spindles and the bells apart in the axial direction and then moving them apart in the radial direction, after which the full spinning bobbins are removed from the spindles and empty bobbin tubes are placed on the spindles, whereby the thread connection between the drafting system and the spinning bobbin is maintained until the empty bobbin tubes are placed on the spindles and those that are guided into the area of the spindles Threads have taken over, after which the spindles and bells are brought back into the spinning position and the spinning process is started again.

With the method according to the invention, the spinning bobbins can be changed quickly and safely. Since the thread connection between spinning bobbins and drafting system is initially maintained through the bells and later the thread ends are automatically connected to the empty bobbin tubes, such a method can be easily incorporated into the control program of a spinning machine.

In a further embodiment of the invention it is provided that the threads are clamped to the spindles when the empty bobbin tubes are placed on them. It is therefore not necessary to provide special thread holding or thread catching devices with which the thread end is fixed.

In a further embodiment of the invention it is provided that the spindles and the bells each carry out only one of the two movements, i.e. a movement in the axial direction or a movement in the radial direction. This results in a clear structure of the drives. Since a movement in the axial direction is necessary in any case to achieve the winding structure, the element carrying out this movement, usually the spindle, expediently also performs the axial movement for doffing. It is also expedient to move the bells radially towards the spindle axes towards the center of the machine. This movement takes place in an area of the spinning machine in which there is sufficient installation space.

In a further embodiment of the invention it is provided that first spindles and bells are moved apart in the axial direction and then moved apart from each other in the radial direction to such an extent that the bells are held on the holders attached receptacles for spinning bobbins are located in the axial direction above the spindles, then these receptacles and the spindles for receiving the spinning bobbins are moved towards and away from one another again, so that the holders of the bells with empty bobbin sleeves accommodated in second receptacles are moved over the spindles, whereupon the spindles and the second receptacles for transferring the empty bobbin are moved towards and away from each other, after which the bells are brought back over the spindles and bells and spindles are moved into one another in the axial direction, at least the spindles already starting up. With this method, the movements required for changing the bobbin are kept to a minimum. During the bobbin change itself, the full spinning bobbins are not completely removed from the area of the spindles, while the empty bobbin tubes are already kept ready in this area. Only after the bobbin change has been completed, while the spinning process has already been resumed, can the full bobbins be finally removed and the empty bobbin tubes brought back in, so that no dead times are caused thereby.

Fig. 1 bis 7

zeigen die Stationen eines ersten Verfahrens zum Spulenwechseln an einer einzelnen Spinnstelle einer eine Vielzahl derartiger Spinnstellen aufweisenden Spinnmaschine und

Fig. 8 bis 16

die einzelnen Phasen eines Spulenwechsels bei einem etwas abgewandelten Verfahren.

Further features and advantages of the invention result from the following description of the embodiments shown in the drawing for carrying out the method.

1 to 7

show the stations of a first method for changing bobbins at a single spinning station of a spinning machine having a plurality of such spinning stations and

8 to 16

the individual phases of a spool change in a slightly modified process.

In the drawings, a spinning station of a spinning machine is shown, which consists of a large number side by side preferably on both sides of the machine in a row arranged spinning positions. Each spinning station contains a drafting system (1) or the like from a roving spool. a roving is fed, which is drawn to the desired yarn count in the drafting device (1). Each spinning station also contains a spindle (3) which is driven by a single motor (4). A spinning bobbin is placed on the spindle (3), on which the spun thread is wound. The spun thread is fed to the spinning bobbin (5) via a bell (2) which is arranged coaxially with the spindle (3) and which engages over the spindle (3) and the bobbin (5) during the normal spinning process. The bell has a guide channel lying in the spindle axis, which has an axial thread inlet. This thread guide channel is followed by a channel piece which is directed essentially radially outwards and usually has an inclination in the take-off direction and which opens into the outer jacket of the bell (2). The thread runs helically on the outer jacket of the bell (2) and leaves it at its lower edge for winding on the spool (5).

The bell (2) will normally be freely rotatable so that it is dragged along by the thread running helically on its outer jacket. However, it is also possible to drive and / or brake the bell positively.

The coil (5) is wound in a so-called cop assembly on a coil sleeve which is attached to the spindle (3). For this purpose, it is provided that there is a corresponding relative movement between the lower edge of the bell (2) and the coil in the axial direction, ie a reciprocating movement in the vertical direction, which gradually shifts towards the upper end of the coil. In the embodiment shown, the vertical, back and forth movement is determined by correspondingly raising and lowering the spindle (3) together with its drive motor (4).

When the construction of the coil (5) is complete, the bell (2) is in the position shown in Fig. 1. In this position, the spinning process is interrupted and the spool change is initiated. For this purpose, the spindle (3) and the bell (2) are first moved apart in the axial direction such that the coil (5) with its sleeve is free from the lower edge of the bell (2). A corresponding thread length is drawn off from the spinning bobbin (5) so that there is no thread breakage (FIG. 2). Thereupon the bell (2) with its holder (10) is moved radially to the spindle (3), namely inwards towards the center of the machine. At the same time, the thread extending between the bobbin (5) and the bell (2) is fed a thread guide element (6) which, for example, has a V-shaped shape that is open at the bottom and is bent from a wire bracket. This thread guide element (6) is moved obliquely downwards towards the machine center until it comes to lie approximately at the level of the lower end of the sleeve of the bobbin (5), i.e. somewhat above an extension on which an empty coil sleeve (9), which is put on the spindle (3), is later supported in the axial direction.

A transport device (7) is assigned to the spinning machine, which consists, for example, of a conveyor belt running along each machine side, which is provided at predetermined intervals with upstanding pins. On this transport element (7) there are initially alternately free pins and pins on which empty bobbin tubes (9) are attached. By means of a transfer device (8) known per se, which is known, for example, from ring spinning machines, the full spinning bobbins are gripped in the position according to FIG. 3 and placed on the empty pins of the transport element (7) (FIG. 4). Here, too, the thread connection between the drafting devices (1) and the spinning bobbins (5) is not interrupted. The thread runs in a kind of thread reserve from the outlet openings located in the sleeves of the bells (2) over the thread guide elements (6) to the upper end of the spools on the transport element (7) (FIG. 4).

The transport element (7) then continues by one spindle division, the thread connection likewise not being interrupted. The thread is deflected somewhat by the spindle (3) so that it is at a defined point. The transfer device (8) now takes empty bobbin tubes (9) from the transport element (7) and attaches them to the spindles (3). The thread between the guide element (6) and the upper end of the spinning bobbin (5) is clamped to the spindle (3) by the lower edge of the bobbin tube (9). The thread is then cut near the empty bobbin tube (9) by means of a cutting device (17), which is only shown schematically in FIG. 5, after which the full spinning bobbins (5) can be finally removed (FIG. 5).

Then the drive motor of the spindle (3) is switched on again, while at the same time the thread guide element is moved out of the area of the spinning positions (FIG. 6). The spindle (3) is moved upwards so that it penetrates into the bell (2). The drafting system (1) is also switched on again so that the spinning process runs again. The spun thread then runs again helically on the bell (2) (Fig. 7). The spindle (3) executes the necessary vertical movements according to the cop winding, while the bell (2) only executes a rotational movement to which it is dragged.

The individual spinning positions of the spinning machine according to FIGS. 8 to 16 do not differ in principle from the spinning positions of the embodiment according to FIGS. 1 to 7, so that the same reference numerals are chosen for the same elements. With regard to the spinning positions, there is only one difference in the holders (11) for the bells, on which two additional receptacles (12, 13) are attached, ie two additional ones Recordings (12, 13) for each spinning station. Empty coil sleeves (9) are kept ready in the receptacles (13) adjacent to the bells (2). After the bobbin (5) is filled, the spinning process in the position corresponding to FIG. 8 is also ended in this embodiment. The bell (2) and the spindle are moved apart in the axial direction, which is done in the illustrated embodiment by lowering the spindle (3) and its motor (4) (Fig. 9). A thread guide element (14) arranged between the drafting devices (1) and the inlet sides of the bells (2) is now extended transversely to the thread path, so that thread reserves are formed in the area between the drafting devices (1) and the bells (2). Fig. 10) for which the required thread length is subtracted from the full spools (5). After or while these thread reserves are being formed, the holders (11) of the bells (2) are moved radially to the spindles (3) until the free receptacles (12) are located vertically above the spindles (3) ( Fig. 11). Thread is drawn off the outer jacket of the bell. The next step is to raise the spindle (3) in such a way that the upper end of the bobbin tube is fed to the full spinning bobbin of the receptacle (12). The receptacle (12) consists of gripping elements which engage behind a corresponding inner ring collar of the coil sleeve and which then hold the spinning bobbin (5) when the spindle (3) is lowered. Such gripping elements are known, for example, for holding roving bobbins. By lifting the bobbin of the spinning bobbin (5) again, it can be released from the gripping elements of the receptacle (12). The full spinning bobbins (5) have thus been transferred to the holders (11) or their receptacles (12). The spindles (3) are then lowered again so that they are completely free of the full spools (5) (Fig. 13). In this state, the thread present in each case is pulled down over guide elements, for example a ring (18) which can have V-shaped incisions, and over the lower edge of the empty bobbin sleeves (9) provided in the holders (11). brought. The guide element (14) moves back a little so that part of the thread reserve is released.

The brackets (11) then move radially to the spindle (3) such that the coil sleeves (9) are located vertically above the spindles (3). The spindles (3) are then moved upwards, so that the empty spool sleeves (9) are placed on the spindles (Fig. 14). The receptacles (13) are also designed in the manner described for the receptacles (12), i.e. by lifting the empty spool sleeves (9) in the receptacles (13), they can be detached from the receptacles (13) and are then carried along by the spindles. When the empty bobbin tubes (9) are taken over by the spindles (FIG. 14), the threads are clamped between the spindles and the lower edges of the empty bobbin tubes. The connection to the full spinning bobbins (5) hanging in the brackets (11) is then separated, after which the spindle with the empty bobbin tubes are moved down. Then the holders (11) are moved radially to the spindle (3) in their original position (Fig. 8), so that the spindles (3) with the empty coil sleeves (9) are under the bells (2) (Fig. 15 ). In this position, the drive of the spindles (3) is switched on, while at the same time the thread guide element (14) is moved back out of the thread path (FIG. 15), so that the thread reserve dissolves. Then the spindle (3) with the empty coil sleeve (9) is moved upwards so that it penetrates into the bell (2). The drafting device (1) is switched on again, so that the spinning process is resumed (FIG. 16).

For this change of the full spinning bobbins (5) against empty bobbin tubes between the interruption of the spinning process and the resumption of the spinning process, only a relatively short period of time is required, since only very short distances from the individual elements have to be carried out, that is to say only those necessary ways for the exchange, while the final removal of the full spinning bobbins (5) and the restoration of empty bobbin tubes can be carried out while the spinning process is running, ie in the operating state according to FIG. 16.

In the case of spinning devices which use a bell (2) instead of a ring and a rotor, it is normally not readily possible to apply a winding in the region of the lower sleeve end of the full spinning bobbins (5) at the end of the spinning process. However, this is possible with the help of the thread reserve formed in FIGS. 10 and 11. In this case, the full spinning bobbins (5) in the position according to FIG. 11 are fed a ring which is coaxial with the spindle axis, or the spinning bobbin is fed to a stationary ring which holds the thread in the region of the lower end of the bobbin tube of the spinning bobbin (5). leads. By dissolving a part of the thread reserve formed by the guide element (14), an underwinding can then be created, after which the ring is then removed again and the bobbin exchange is continued in a state in which the thread is not as shown in FIG. 11 from the upper one End of the full spinning reel (5) leads to the opening in the jacket of the bell (2), but correspondingly from an underwinding. However, this would not lead to a fundamental difference in the subsequent workflow during the bobbin change.

Claims (16)

1. Method for automatically exchanging cops on a spinning machine having a plurality of spinning positions, comprising each a drafting system and a spindle serving to accept the bobbins as well as a bell extending coaxially relative to the spindle and embracing the latter, characterized by the steps of interrupting the spinning process without thread breakage, moving the spindles and the bells apart in the axial direction and thereafter away from each other in the radial direction, removing the full cops from the spindles and fitting empty tubes on the spindles, with the thread connection between the drafting system and the cops remaining intact until the empty tubes have been placed on the spindles and have picked up the threads which are run through the area of the spindles, and returning the spindles and the bells finally to the spinning position and resuming the spinning process.

2. Method according to claim 1, characterized in that the threads are clamped on the spindles during mounting of the empty tubes.

3. Method according to claim 1 or 2, characterized in that the spindles and the bells respectively only one of the two movements, i.e. a movement in axial or in radial direction.

4. Method according to claim 3, characterized in that the spindles perform a movement in axial direction and the bells perform a movement in radial direction.

5. Method according to claim 4, characterized in that the bells are moved radially to the spindle axes and toward the machine center.

6. Method according to any of claims 1 to 5, characterized in that a thread reserve is provided between the cops and the drafting system from which a base bunch is wound on the cops after interruption of the spinning process.

7. Method according to any of claims 1 to 6, characterized in that a thread reserve is built up between the cops and the drafting system which is used up at least partly when the thread is fed to the spindles for being clamped by means of the tubes.

8. Method according to claim 6 or 7, characterized in that the thread reserves are built up prior to interrupting the spinning process.

9. Method according to claim 6 or 7, characterized in that the thread reserves are built up following the interruption of the spinning process, by drawing thread off the cops.

10. Method according to any of claims 6 to 9, characterized in that the thread reserves are used up when the spinning process is resumed, by winding up the thread on the tubes as they move into the bells.

11. Method according to any of claims 1 to 10, characterized in that during the changing process the full cops are initially transferred to an intermediate position adjacent the respective spindles where the threads are in contact with the latter.

12. Method according to any of claims 1 to 10, characterized by the steps of moving the spindles and the bells apart in the axial direction and then away from each other in the radial direction, until receiving means for cops provided on the holders of the bells occupy a position axially above the spindles, moving the said receiving means and the spindles towards each other for receiving the cops, and then again away from each other, moving the holders of the bells, with the empty tubes received in second receiving means, to a position above the spindles, whereupon the spindles and the second receiving means are moved towards each other for transferring the empty tubes, and then again away from each other, and transferring the bells finally to a position above the spindles and guiding the bells and the spindles into each other in the axial direction, during which latter step operation is already resumed, at least by the spindles.

13. Method according to claim 12, characterized in that prior to moving the second receiving means with the empty tubes and the spindles toward each other the thread, which comes from the the associated drafting system and which passes the bell on its way to the cops, is placed transversely across the open end of the respective empty tube.

14. Method according to claim 12 or 13, characterized in that the full cops are removed from the receiving means of holders of the bells after operation has been resumed.

15. Method according to any of claims 12 to 14, characterized in that empty tubes are fitted on the second receiving means of the holders of the bells prior to initiating the changing operation.

16. Method according to any of claims 12 to 15, characterized in that the full cops and the empty tubes are gripped by the receiving means at their upper tube ends facing away from the spindles.

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