EP0310871B1 - Method and device for automatically exchanging roving bobbins in a ring spinning machine - Google Patents

Description

The invention relates to a method and a device for automatically changing roving bobbins on a ring spinning machine by means of a movable maintenance carriage, in which a new, full roving bobbin is removed from a transport device and transferred to a gate, and in which an old, almost empty roving bobbin is removed from the gate and is transferred to the transport device, and for automatically connecting the beginning of the new roving spool with the roving running off the old roving spool.

In a known device (EP-A 0213 962) of the type mentioned at the outset, it is provided that the new roving spool is first removed from the transport device and inserted into the change carriage. The start of the roving is sought in the change carriage, which is then gripped and connected to the roving of the old bobbin entering the drafting system, which is still in the creel. Then the old roving is cut. The new roving spool, from which the roving now runs to the drafting system, is then returned to the transport device. The empty bobbin is then removed from the creel by means of a second gripping device and temporarily held in the change carriage, where the roving residue is wound up. The new roving spool is then removed from the transport device and transferred to the creel. The empty roving bobbin is then placed on the transport device. Overall, this is a relatively cumbersome process, for which relatively complex means have to be provided. There are two sets of gripping elements necessary, which can be delivered to the transport device and the creel and which either accommodate the new roving bobbins or the old roving bobbins. In addition, there is a further effort, since the known design is only able to change the bobbin on the outer row of the gate of a ring spinning machine. Thus, the creel requires a special design with a further drive through which the roving bobbins of the two rows are interchangeable, so that the rear row of roving bobbins then becomes the front row and can also be changed.

The invention has for its object to simplify a method of the type mentioned in such a way that the movement sequences become easier and that simpler means can then be used to carry out the method.

This object is achieved by first removing the new roving spool from the transport device and temporarily storing it in the maintenance car, then removing the old roving spool without interrupting the running in of the roving, removing it from the gate and transferring it to the transport device, after which the new roving spool is removed from the maintenance car is removed and inserted into the creel, the beginning of the roving of the new roving spool being connected to the roving of the old roving spool, after which the roving of the old roving spool is separated.

Due to the temporary storage of the new roving bobbins in the maintenance car, it is possible to get by with only one or a set of gripping elements which carry out all the movements with which the full and empty roving bobbins are transported. This one gripping element or the one set of gripping elements can also be moved relatively freely since it is not hindered by other gripping elements. It is therefore easily possible to use the same gripping elements both of the front row and the rear row of roving bobbins of the creel to send.

In a further embodiment of the invention it is provided that the beginning of the roving of the new roving spool is searched for and ready while this roving spool is in the intermediate position in the maintenance carriage. This search can then be carried out while the gripping elements carry out other work, namely the removal of the old roving bobbin and the transfer of these roving bobbins to the transport device.

In a further embodiment of the invention, it is provided that the beginning of the roving of the new roving bobbins is connected to the roving of the old roving bobbin while the new roving bobbin is being transferred from the maintenance carriage to the creel. As a result, the overall time required for the changing process can be kept relatively short.

In a further embodiment of the invention it is provided that the old or the new roving spool is driven to rotate when they are moved from one position to another while roving is running off them. This measure ensures that, on the one hand, during these movements, in which the distance to a guide or to the drafting device increases, the roving is not torn. On the other hand, care is taken to ensure that during a movement in which the distance of the roving bobbin to a guide or to the drafting device is reduced, no loops are formed which could get caught on another machine part.

In a further embodiment of the invention, it is provided that after the roving of the old roving bobbin has been separated, this roving bobbin already delivered to the transport device is driven to rotate in order to wind up the remaining roving. This ensures that this roving does not fall off and leads to malfunctions.

Fig. 1 bis 15

zeigen die verschiedenen Stufen eines Wechselns der Vorgarnspulen in schematischer Darstellung,

Fig. 16 bis 18

zeigen in vergrößertem Maßstab einen Vorgarngreifer, dessen Fadenklemme sich in verschiedenen Positionen befindet,

Fig. 19

eine Ansicht auf Streckwerke, denen mehrere Vorgarngreifer von der rechten Seite hin zugestellt sind und

Fig. 20

eine Ansicht auf ein Streckwerk, dem die gleichen Vorgarngreifer nach einem Drehen um 180° von der linken Seite bezüglich der Belastungsarme zugestellt sind.

Further features and advantages of the invention and in particular of a device result from the following description of the embodiment shown in the drawings and the subclaims.

1 to 15

show the different stages of changing the roving bobbins in a schematic representation,

16 to 18

show on a larger scale a roving hook, the thread clamp is in different positions,

Fig. 19

a view of drafting systems, to which several roving grippers are delivered from the right side and

Fig. 20

a view of a drafting system, to which the same roving grippers are delivered after rotating through 180 ° from the left with respect to the loading arms.

1 to 15 described below only show the essential elements that are important for explaining the invention. Elements are additionally shown in individual figures, which are omitted in the other figures for reasons of illustration. These elements are only shown in these figures in which they operate.

From a ring spinning machine, only a drafting device (10) and a creel (14) are indicated. The gate (14) is with hangers for roving bobbins (15, 15 ') provided which are arranged in a front and a rear row. As will be explained later with reference to FIGS. 19 and 20, the drafting units have pressure roller twins carried in load arms, so that the drafting units (10) formed by these pressure roller twins each have a roving spool (15) in the rear row and a roving spool (15 ') front row are assigned.

A rail (30) is attached to the gate (14), on which a monorail (13) can be moved. The overhead conveyor (13) contains suspension holders (31) which correspond to the suspension holders (31) of the gate (14) and are attached to the new, full roving bobbins (12) which have been fed to the ring spinning machine on this suspension conveyor (13). The full roving bobbins (12) are kept at a predetermined distance, which corresponds to the distance between the roving bobbins (15, 15 ') of a row, ready for a roving bobbin change.

The roving bobbin change is carried out by means of a maintenance carriage (11) which can be moved in the longitudinal direction of the ring spinning machine. The maintenance carriage (11) is designed so that it can carry out the simultaneous change of several roving bobbins (12, 15, 15 ') simultaneously, i.e. for a group of four or six roving bobbins (15, 15 ') in a row. In the drawings, which only represent end views, only the elements for a roving bobbin (12, 15, 15 ') are shown.

The maintenance car (11) is called when the roving bobbins (15 or 15 ') of a roving bobbin row are so far empty that a bobbin change is required. In the exemplary embodiment, this is the case for the rear row of roving bobbins (15). The maintenance device (11) then stops in the position shown in FIG. 1. The maintenance device (11) contains a plurality of peg-like gripping elements (18) which are arranged on a beam-like holding device (19). The holding device (19) contains a rotary drive with which the pin-like gripping elements (18) can be rotated about their vertical axis in both directions of rotation. For example, a belt drive or a toothed belt drive or a chain drive or the like. provided, which is housed in the beam-like holding device (19). The holding device (19) is seated on a frame (32) which can be pivoted about a horizontal axis (33) running in the longitudinal direction of the ring spinning machine. The frame (32) is movable in the maintenance device (11) in the vertical direction and at the same time can be pivoted about its horizontal axis (33), so that the holding device (19) with the gripping elements (18) executes a superimposed lifting and pivoting movement which the contour of the ring spinning machine and also the given space is adapted. With this combined lifting and pivoting movement, the peg-like gripping elements of the roving bobbins (12) of the transport device (13) and the roving bobbins (15 and 15 ') of the two rows of the gate (14) can be delivered. Furthermore, it can be provided that the frame (32) with the gripping elements (18) can be pivoted outwards to such an extent that they are located under a temporary storage device (17) and roving bobbins (12) suspended therein can be delivered. In the illustrated embodiment, however, it is provided that the pivoting movement of the frame (32), which it can carry out, is limited to the area vertically below the roving bobbins (12) of the monorail (13). In this case, the intermediate storage device is designed to be horizontally movable, so that it can be moved via the gripping elements (18) located in this position, as will be explained later.

On the holding device (19) of the pin-like gripping elements (18) roving grippers (16) are also attached, which will be explained in more detail later.

When the maintenance trolley (11) has arrived at the spinning positions that require maintenance, it is locked. The pin-like gripping elements (18) are then moved upwards (FIG. 2), so that they hang the full roving bobbins (12) from the monorail (13) and take them into the maintenance trolley (11). The roving bobbins (12) are moved down so far that the intermediate storage device (17) can be brought over them by a horizontal adjustment movement (FIG. 3). The intermediate storage device (17) is provided with hanging brackets onto which the new roving bobbins (12) are placed for intermediate storage.

After the full roving bobbins are plugged onto the intermediate storage device (17), the peg-like gripping elements (18) are lowered again and then subsequently moved into the gate (14) and delivered to the roving bobbins (15) which are almost empty and have to be replaced (FIG. 4). The pin-like gripping elements (18) take the roving bobbins (15) (FIG. 5) that are almost empty and remove them from the creel (FIG. 6) and transport them to the monorail (13), on the hanging holder of which the roving bobbins which are almost empty ( 15) can be attached. During this pulling off from the creel (14) and the subsequent transfer to the overhead conveyor (13), the pin-like gripping elements (18) are driven (arrow in FIG. 6) in order to bring about a length compensation, so that the roving is neither torn nor in disorganized loops can hang down. The almost empty roving bobbins (15) are thus suspended in the overhead conveyor (13) in such a way that the roving continues to run into the drafting units (10). Then the pin-like gripping elements (18) are lowered again to their lowest position. In the movable maintenance carriage (11), the roving bobbins held in the intermediate storage device (17) are prepared so far that the beginning of the roving is sought out and kept ready. For this purpose, the hangers of the intermediate storage device (17) are driven in the unwinding direction of the roving bobbins (12) (FIG. 6) while simultaneously the roving spool (12) at the point where the roving start is approximately, a suction nozzle is delivered. As shown in Fig. 8, the roving start is thus held ready in such a way that it can be picked up in front of the roving grippers (16) when the pin-like gripping elements of the roving spool (12) are returned (Figs. 9 and 10).

The pin-like gripping elements (18) then remove the new roving bobbin from the intermediate storage device (17), which then moves back to its starting position. The pin-like gripping elements (18) with the roving bobbins are then moved in the direction of the creel. The roving grippers (16) are pivoted about a horizontal axis (13) in such a way that they are fed to the drafting system (10) with their clamping element that holds the roving beginning (FIG. 11). As will be explained later, the clamping elements of the roving grippers (16) open so that the roving start held by them can run into the drafting devices (10). As will be explained later, opening the clamps of the roving gripper (16) also causes the old roving to be separated, which still runs from the old roving spool (15). A drive device (20), which also contains a thread guide (26), is delivered to this roving spool (15), which is located in the overhead conveyor (13), by means of which the roving spools (15) are driven in the winding direction (FIG. 11) . The roving that was cut off in the area of the drafting units (10) is thus still wound onto the roving bobbins (15) before they are transported away from the monorail.

After the old roving has been cut off, the clamps of the roving grippers (16) move into a further position in which they form a guide eye for the roving running off the roving bobbins (12). The roving bobbins (12) are then fed from the pin-like gripping elements (18) to the hanging brackets (31) of the gate (14). The roving grippers (16) perform controlled swiveling movements about their axis (23), see above that the roving in roving guides (27, 28) of the gate (14) is threaded (Fig. 12).

After the new roving spools (12) have been inserted into the creel (14) (FIG. 13), the roving grippers (16) open completely and the pin-like gripping elements (18) with the roving grippers (16) move into the maintenance trolley (11). back (Fig. 14) until they return to their starting position (Fig. 15), which corresponds to the position in which the maintenance car (11) moves (see also Fig. 1). This concludes the roving bobbin change. It is easy to see that in principle the same processes can also be carried out if the roving bobbins (15 ') of the front row are to be replaced.

16 to 18, a roving gripper (16) is shown in its basic structure. The roving gripper (16) is arranged on a horizontal axis (23) which is mounted in bearing arms (40) of the holding device (19) and which can be pivoted via an electric motor (not shown). The roving gripper (16) is divided into two parts (42 and 43) via a rotary bearing (41). The part (42) can be rotated relative to the part (43) about the longitudinal axis (24) of the roving gripper (16) by means of a drive motor (44). The purpose of this twisting will be explained later with reference to FIGS. 19 and 20. On the part (42), which is laterally offset from the axis of rotation (24), a bracket (45) is attached in a stationary manner, the transversely projecting arm of which is provided with an elastic covering. A clamping lever (47) is attached to the part (42) so as to be pivotable about an axis (46) and is driven by a lifting rod (48) which in turn can be moved in the longitudinal direction of the axis (24) by a motor and drive elements (not shown).

Fig. 16 shows the roving hook (16) in the open position of the thread clamp (22), ie in the position in which it the roving beginning held in the maintenance wedge (11) is delivered (Fig. 9). Then the thread clamp (22) is closed (Fig. 10). The closed position of the clamp is shown in Fig. 17. The clamping lever (47) has been pivoted about the axis (46) so that it rests on the elastic covering of the stationary arm (45). In this clamping position, the roving gripper (16) is then moved further and delivered to the drafting system (10) (FIG. 11). In this position, the thread clamp (22) then opens by pivoting the clamping lever (47) back into the position shown in FIG. 16. The back of the clamping lever (47) lies against an elastic covering of a projection (50) which projects in the longitudinal direction, the roving of the roving spool (15) which has almost run empty and is already suspended in the transport device (13), being separated. If necessary, the back of the clamping lever (47) can be designed as a cutting edge. After severing the roving of the old roving spool (15), the clamping lever (47) is moved back into an intermediate position (Fig. 18). In this intermediate position, he pictures with an extension (51) projecting from the arm (45), which is expediently provided on both sides of the clamping lever (47), an eyelet (52) in which the roving running off the new roving spool (12) is guided will (Fig. 12, 13). After the new roving spool (12) is inserted into the creel (13), the thread clamp (22) is fully opened again, ie brought into its position according to FIG. 16, so that the gripping elements (18) and the roving gripper (16) can move back to the starting position (Fig. 14 and 15).

As can be seen from FIG. 16 and in particular FIG. 17, the (closed) thread clamp protrudes laterally like a beak from the roving hook (16), the thread clamp (22) lying in the axis (24) while the body (42) the roving gripper (16) itself is set back somewhat. Because of this design and because it can be rotated about the longitudinal axis (24), it is possible to feed the same roving grippers (16) from the right and from the left to the drafting systems.

The drafting systems (10) are formed by lower cylinders and top rollers running in the longitudinal direction of the machine, two of which are combined to form pressure roller twins (57, 58, 59) (FIGS. 19 and 20), each of which is held by a supporting and loading arm (55). As indicated in Fig. 19 with dash-dotted circles (15, 15 '), one side of the pressure roller twins a roving spool (15') is assigned to the front row and a roving spool (15) to the rear row. In Fig. 19 it is assumed that the roving grippers (16), four of which can be seen, are fed to the right pressure rollers in the drawing with respect to the loading arm (55). The laterally beak-like thread clamps (22) of the roving grippers (16) extend into the area of an inlet funnel (56) upstream of each drafting system (10). 19 and 20 can be seen from Fig., The thread guides (27, 27 ') of the gate and the thread guides (28, 29) are hook-shaped, so that the thread clamp (22) the roving into it from one side can insert. As can be seen from FIGS. 19 and 20, the thread guides are each bent in the area adjoining the U-shaped guide eyelet from the open side, so that the roving clamp (22) can be passed in this area without hindrance.

If the roving grippers are rotated by 180 ° (Fig. 20), they can be fed to the drafting systems (10) from the left side, i.e. they are then suitable for changing the roving of the front bobbin row. In this case, the roving grippers are inserted into thread guides (27 ') arranged in mirror image to the thread guides (27). The same applies to the thread guides (28 and 29).

Claims (19)

1. Method for automatically changing roving bobbins in a ring spinning machine using a travelling service carriage, comprising the steps of picking up a new full roving bobbin from a transport means and transferring it to a creel and picking up a previous, almost empty roving bobbin from the creel and transferring it to the transport means, and for automatically connecting the beginning of the new roving bobbin and the roving which is pulled off the previous roving bobbin, characterized by the steps of picking up at first the new roving bobbin from the transport means and storing it provisionally in the service carriage, picking up the previous roving bobbin from the creel and transferring it to the transport means, without interrupting the roving infeed, picking up the new roving bobbin from the service carriage and placing it in the creel, during which process the beginning of the roving of the new roving bobbin is connected with the roving of the previous roving bobbin, and finally cutting off the roving of the previous roving bobbin.

2. Method according to claim 1, characterized in that the beginning of the roving of the new roving bobbin is found and presented ready for use, while the roving bobbin still occupies its intermediate position in the service carriage.

3. Method according to claim 1 or 2, characterized in that the connection of the beginning of the roving of the new roving bobbin with the roving of the previous roving bobbin is carried out during transfer of the new roving bobbin from the service carriage to the creel.

4. Method according to claim 3, characterized in that the roving of the new roving bobbin is threaded into creel guides after the beginning of the roving of the new roving bobbin has been connected with the roving of the previous roving bobbin and while the new roving bobbin is fed to the creel.

5. Method according to any of claims 1 to 4, characterized in that the beginning of the new roving bobbin is connected with the roving of the previous roving bobbin directly in the feed area of a drafting system.

6. Method according to any of claims 1 to 5, characterized in that the previous or the new roving bobbin is set into rotating movement on its way from one position to another, while giving off roving.

7. Method according to any of claims 1 to 6, characterized in that after cutting off the roving of the previous roving bobbin the latter, having already been transferred to the transport means, is set into rotating movement in order to wind up the remaining roving.

8. Device for automatically exchanging roving bobbins in a ring spinning machine comprising a travelling service carriage provided with means for picking up a new, full roving bobbin from a transport means and for transferring it to a creel, and for picking up the previous, almost empty roving bobbin from the creel and transferring it to the transport means, and containing means for automatically connecting the beginning of the new roving bobbin with the roving delivered by the previous roving bobbin, characterized in that the service carriage (11) contains an intermediate storage (17) for roving bobbins to which the same gripper elements (18) can be fed which can be fed also to the transport means (13) and the creel (14), and that the gripper elements (18) are equipped with roving grippers (16) which can be fed to the area of the drafting mechanisms (10) during introduction of the gripper elements (18) into the creel (14).

9. Device according to claim 8, characterized in that the gripper elements (18) of the service carriage (11) can be fed to the rear and to the front row of the roving bobbins (15, 15′) of the creel (14).

10. Device according to claim 9, characterized in that the service carriage (11) is equipped with a plurality of plug-like gripper elements (18), to which roving grippers (16) are assigned which are arranged laterally of the plug-like gripping elements (18), on the same mounting (19).

11. Device according to claim 10, characterized in that the plug-like gripper elements (18) are provided with a rotary drive.

12. Device according to any of claims 8 to 11, characterized in that the service carriage (11) is equipped with means (21) for finding and presenting the beginning of the roving of the roving bobbins (12) present in the intermediate storage (17).

13. Device according to claims 12, characterized in that the intermediate storage (17) is equipped with a rotary drive for the roving bobbins (12) received therein and that a suction nozzle (21) is provided which can be fed to and retracted from the roving bobbin (12) received in the intermediate storage (17).

14. Device according to any of claims 8 to 13, characterized in that the roving gripper or grippers (16) are provided with means for cutting off a roving being fed into a drafting system (10).

15. Device according to any of claims 8 to 14, characterized in that the roving grippers (16) are provided with a thread clip (22) projecting to the side in the manner of a beak.

16. Device according to claim 15, characterized in that the thread clip (22) can be switched to three positions, namely an open, a closed and an intermediate position in which the thread clip (22) forms a guide in the form of an eye.

17. Device according to any of claims 8 to 16, characterized in that the roving grippers (16) can be pivoted, by means of a drive, about a horizontal axis (23) extending in parallel to the longitudinal sense of the ring spinning machine.

18. Device according to any of claims 8 to 17, characterized in that the roving grippers (16) can be rotated, by means of a drive, by 180° about their longitudinal axis (24).

19. Device according to any of claims 8 to 18, characterized in that the service carriage (11) is provided with means (20) for rotating roving bobbins (15) present in the transport means (13).

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