EP0310870B1 - Method and device for inserting filled roving bobbins - Google Patents

Description

The invention relates to a method and a device for replacing full roving bobbins, which are provided by means of a transport device on a ring spinning machine, for empty roving bobbins, which are arranged in two rows in a creel of the ring spinning machine, the changing in being carried out by means of a movable changing carriage. which is provided with means for gripping the roving bobbins which remove the full roving bobbins from the transport device and transfer them to the gate and which remove the empty roving bobbins from the gate and transfer them to the transport device.

If the roving bobbins in a creel of a ring spinning machine have run empty, they must be replaced by full roving bobbins so that the spinning operation can continue. The roving bobbins can be replaced when they are completely empty. In this case, a new piecing must be carried out with a new run-in of the roving. If the roving bobbins are replaced before they have completely expired, i.e. as long as roving runs from them to the relevant drafting device of the ring spinning machine, it is possible to connect this incoming roving with the beginning of the roving of the full roving bobbin to be replaced, so that the Spinning process can continue uninterrupted. It is expressly noted that the term "empty" roving bobbins is used to describe the present invention, including both of the foregoing Cases are to be understood, namely that the roving bobbins have run completely empty, or that they have only run almost empty and that a roving runs into the drafting units when the full roving bobbins are replaced.

In a known method and a known device of the type mentioned at the beginning (EP-A-0 213 962), the means for gripping the roving bobbins contain two sets of gripping elements which can manipulate full and empty roving bobbins at the same time. A set of the gripping elements removes the full roving bobbins from the transport device and transfers them to the creel. The other set takes the empty roving bobbins from the creel and transfers them to the transport device. In order to be able to carry out these functions, it is necessary that the empty roving bobbins and the full roving bobbins as well as the gripping elements are moved past each other at the same time and above all. This results in complicated movements that require a relatively high manufacturing cost for the means for gripping the roving bobbins. In the known design, only the front row of the gate can be operated, i.e. only the roving bobbins in the front row of the gate can be replaced by full roving bobbins with the means of the change car. In order to also allow the rear row to be replaced, the gates contain turning devices, to each of which a roving spool of the front row and a roving spool of the rear row are attached. By rotating these devices after the roving bobbins have been replaced, the roving bobbins which have not been replaced can thus be brought into the front row so that they can then also be replaced. This requires a further considerable effort, which requires additional devices on the ring spinning machine.

For replacing bobbins filled on a textile machine with empty bobbin tubes, it is known (DE-A-24 38 247) to provide two identically designed interchangeable carriages which one after the other same spinning stations are delivered. The gripping elements of one exchange cart take over the filled bobbins, while the other exchange cart brings the empty bobbin cases and inserts them into the machine. To replace filled bobbins with empty tubes it is also known (DE-B-21 58 657) to carry out a so-called block change in which all bobbins on one machine side are changed at the same time. For this purpose, a device is provided which is permanently installed in the machine and which first places the empty tubes in an intermediate position, then removes the full bobbins and then inserts the empty tubes into the machine.

The invention has for its object to design a method and an apparatus of the type mentioned in such a way that the disadvantages of the prior art are avoided.

This object is achieved according to a first embodiment in that the means for gripping the roving bobbins first release full roving bobbins after being removed from the transport device to a receptacle of the replacement car serving as a buffer, then remove the empty roving bobbins from the gate and transfer them to the transport device and then remove the full roving bobbins from the holder and transfer them to the creel.

In another embodiment, it is provided that the means for gripping the roving bobbins, after being removed from the gate, deliver the empty roving bobbins to an intermediate storage receptacle of the interchangeable vehicle, then take over the full roving bobbins from the transport device and transfer them to the gate and then transfer the empty ones Remove roving bobbins from the holder and hand them over to the transport device.

In both cases the advantage is achieved that only one set of gripping elements is necessary. This can reduce the effort. Since no gripping elements run past each other and since the gripping elements only have to perform a lifting and a transverse movement, ie movements essentially only in one plane, relatively simple constructions are made possible.

In a further embodiment of the invention it is provided that the same means for gripping the roving bobbins are received both for the accommodation of the interchangeable carriage, as well as for the transport device and the two rows of the gate. This ensures that no additional devices have to be provided on the ring spinning machine, through which the roving bobbins of the two rows of the gate swap places.

In a further embodiment of the invention, a device of the type mentioned at the outset is created, in which the change carriage contains a receptacle for roving bobbins, which serves as a buffer for roving bobbins and the means for gripping the roving bobbins can be delivered. With such a device, the necessary manipulations can be carried out with only one set of gripping elements in order to exchange full roving bobbins for empty (or almost empty) roving bobbins.

In a further embodiment of the invention it is provided that the gripping elements are arranged on a support element which can be moved in a combined lifting and transverse movement by means of a drive system. This allows movements to be carried out that only take place on one level. These movements can be adapted to the given standard conditions and in particular to the contour of the ring spinning machine.

Fig. l

zeigt eine perspektivische Ansicht auf eine Ringspinnmaschine mit einem schematisch dargestellten Wechselwagen zum Einwechseln von vollen Vorgarnspulen gegen leergelaufene Vorgarnspulen,

Fig 2

ein Schemabild für das Durchführen des Verfahrens, bei welchem leergelaufene Vorgarnspulen in dem Wechselwagen zwischengespeichert werden,

Fig 3

ein Schemabild ähnlich Fig. 2 zum Durchführen eines Verfahrens, bei welchem volle Vorgarnspulen zunächst in dem Wechselwagen zwischengespeichert werden,

Fig 4

ein Prinzipbild zur Darstellung der von den Mitteln zum Ergreifen der Vorgarnspulen des Wechselwagens durchzuführenden Bewegungen während eines Einwechselvorganges,

Fig 5

eine perspektivische Ansicht der Mittel zum Ergreifen der Vorgarnspulen eines Wechselwagens mit dem zugehörigen Antrieb für diese Mittel und

Fig 6

eine schematische Darstellung einer weiteren Ausführungsform eines Antriebes für die Mittel zum Ergreifen der Vorgarnspulen.

Further features and advantages of the invention result from the following description of the embodiments shown in the drawing and the subclaims.

Fig. L

shows a perspective view of a Ring spinning machine with a schematically shown change carriage for changing full roving bobbins against empty roving bobbins,

Fig. 2

1 shows a schematic image for carrying out the method in which empty roving bobbins are temporarily stored in the change carriage,

Fig. 3

2 shows a schematic image similar to FIG. 2 for carrying out a method in which full roving bobbins are first temporarily stored in the change carriage,

Fig. 4

1 shows a basic diagram to illustrate the movements to be carried out by the means for gripping the roving bobbins of the changeover carriage during a changeover process,

Fig. 5

a perspective view of the means for gripping the roving bobbins of an interchangeable car with the associated drive for these means and

Fig. 6

is a schematic representation of a further embodiment of a drive for the means for gripping the roving bobbins.

In Fig. 1, a ring spinning machine (12) is shown schematically, which has a creel (14), in which roving bobbins (13) are suspended in two rows, the rovings of which run into the drafting units (30). The gate (14) has hanging holders in a known manner, into which the sleeves of the roving bobbins (13) are inserted and held from below. In front of the gate (14) and slightly higher than this gate (14), a transport device (11) is provided, which is designed in the manner of an overhead conveyor. This overhead conveyor owns also the hangers known per se, in which full roving bobbins (10) are held. The full roving bobbins (10) are inserted with their sleeves into these hangers. The hangers of the transport device (11) are located on rail-like carriages which have the same pitch for the hangers in which the hangers of the gate (14) are also arranged.

If the roving bobbins (13) of the gate (14) are empty or almost empty, they are replaced by full roving bobbins (10) which are suspended from the transport device (11) and suspended in the gate (14). This replacement of the full roving bobbins (10) in connection with the removal of the empty roving bobbins (13) is carried out by a change carriage (15) which can be moved along the ring spinning machine in a manner not shown and can be delivered to a group of spinning stations. In the illustrated embodiment, it is provided that the change carriage (15) is designed so that it changes a group of six full roving bobbins (10). The change carriage has a frame-shaped swivel part (16) which is designed as a gripper for six roving bobbins (10 or 13). The swivel gripper (16), which is provided with pin-like gripping elements (18), can be fed to the roving bobbins (10 or 13) from below in such a way that the roving bobbins (10 or 13) are raised in the hanging brackets so that the hanging brackets open and release the roving bobbins (10, 13). When the roving bobbins (10 or 13) are delivered to the hanging holders, they snap into the sleeves of the roving bobbins (10, 13) so that they are held again. The maintenance carriage (15) also contains a receptacle (17) which is provided with a corresponding number of hanging brackets for the roving bobbins (10 or 13) so that they can be temporarily stored there during the replacement.

The possible process sequence during the replacement of full roving bobbins (10) is explained with reference to FIGS. 2 and 3. 2, the empty or almost empty roving bobbins (13) are removed from the creel (14) and stored in the change carriage (15) on the receptacle (17) in the position (13 '). Then the gripping elements (18) of the change carriage (15) remove the full roving bobbins (10) from the transport device (11), which are brought to the creel (14) and used there instead of the empty roving bobbins (13). The gripping elements (18) of the change carriage (15) then go back into the change carriage (15), take the empty roving bobbins (13 ') from the receptacle (17) and transfer them to the transport device (11), which the empty roving bobbins later transported away. With this method it will be difficult to avoid that the roving from the roving spool (13) to be replaced breaks into the ring spinning machine (12), of which only a drafting device is shown. A new attachment process is then necessary.

In the method realized in Fig. 3, the gripping elements (18) of the interchangeable carriage first take the full roving bobbins (10) from the transport device (11) and hang them in position (10 ') in the receptacle (17) serving as a buffer. The same gripping elements (18) then move to the empty or almost empty roving spool (13), which is then removed from the creel (14) and transferred to the transport device (11). Since the transport device (11) is arranged higher than the creel (14), the almost empty roving bobbins (13) can be removed and transferred without a roving breakage occurring. It is then possible to connect the beginning of the roving of the full roving bobbin (10 ') with the roving coming from the almost empty roving bobbin (13) after or during the insertion of the full roving spool, which is removed from the position (10') , so that an interruption of the spinning process of the ring spinning machine (12) is avoided 3, of which only one drafting arrangement is also indicated.

The same gripping elements (18) of the change carriage (15) can be delivered not only to the front row of supply spools (13) of the gate (14), but also to the rear row. The movements necessary for the process sequence according to FIG. 2 or 3 are explained with reference to FIG. 4. The swiveling gripper 16) can be moved up and down in a vertical guide (29) and at the same time can be swiveled about a swiveling axis (21) that moves in the vertical guide (29) and runs horizontally and in the machine longitudinal direction. As will be explained later, the pin-like gripping elements (18) about an axis (24) parallel to the pivot axis (24) are arranged pivotably on a support element, wherein they are positively guided such that they are vertical in each position of the pivoting gripper (16) Keep alignment. The swivel gripper (16), which both moves in the vertical direction and performs a swivel movement over a predetermined range, travels with its gripping elements in a path (49) in the form of an elongated cycloid, which is designed such that the gripping elements (18) in particular, follow the contour of the ring spinning machine (12) and are guided at a relatively short distance and above parallel to the drafting units of the ring spinning machine (12). When a full roving bobbin (10) is replaced, the swivel gripper (16) of the changeover carriage (15) is in the position (16˝). In this position (16˝) the swivel gripper (16) is moved vertically upwards without a swivel movement about the swivel axis (21˝). The gripping elements (18) penetrate the sleeves of the full roving bobbins (10) and detach them from the hanging brackets of the transport device (11). The swivel gripper (16) then moves back without swivel movement about the swivel axis (21) and takes the full roving bobbins (10) with it. The swivel gripper (16) then swivels outwards into the angular position corresponding to the position (16 ') about the swivel axis (21').

Then the swivel gripper (16 ') is moved vertically without changing its angular position. The full roving bobbins (10) are then hung in the position (10 ') in the receptacle (17) of the change car (15) and thus buffered. The swivel hook (16 ') then moves vertically downwards again and is then either pivoted into position (16' '') or (16 '' ''), depending on whether a roving bobbin (13) of the front row or rear row should be replaced. During the lifting from the position (16 ') of the swivel gripper (16) there is a forcibly coupled swivel movement about the swivel axis (21'), so that the gripping elements move on the movement path (49). It is thereby achieved that the gripping elements (18) and thus of course a roving spool arranged thereon move in a predetermined way which is adapted to the spatial conditions. If the front row of roving bobbins (13) suspended in the creel (14) is to be replaced, the swivel gripper (16) remains in the position (16 ′ ′ ′) and does not perform any further swivel movement about the swivel axis (21 ′ ′ ′) out. Then only a lifting movement is carried out with which the roving bobbins (13) are reached. If, on the other hand, the rear row of roving bobbins (13) is to be reached, the combined lifting-pivoting movement is carried out until the pivot axis (21) reaches the position (21 ′ ′ ′ ′) and the pivoting gripper (16) the pivoting position (16 ′ '' ') Has reached, in which the gripping elements (18) are vertically below the roving bobbins (13) of the rear row. Then you switch back to an exclusive lifting movement. The same procedure is followed when the swivel gripper (16) is moved back.

FIG. 5 schematically shows a first embodiment of a drive for a swivel holder (16) with which the movement sequences explained in FIG. 4 can be implemented. The pivoting gripper (16) is designed as a pivotable frame (20) which can be pivoted about a pivot axis (21) is stored. The pivot axis (21) is guided at its two ends in guide elements (46, 47) in vertical guides (48). The guide elements (46, 47) are fixedly connected to a run of a toothed belt or chain (38), which run parallel to one another vertically and which are guided at their upper ends around deflection rollers (50). In the lower area, the two toothed belts are wrapped around drive wheels (51) which are driven by means of a geared motor (31) via an intermediate drive (52) and a shaft (53).

5 is rotatably connected to a worm wheel (34) in which a worm (33) engages. The worm (33) is arranged on a shaft (54) containing a switchable coupling (32), which is in drive connection with a pinion (36) via a belt drive (55). The pinion (36) engages in a stationary, vertical rack (35). When the swivel gripper (16) is raised or is lowered, which is controlled by the drive motor (31), the pinion (36) also rotates in the corresponding direction. When the clutch (32) is switched on, a pivoting movement of the pivoting gripper (16) is then superimposed on the lifting movement.

In the embodiment according to FIG. 5, the pin-like gripping elements (18) of the swivel gripper (16) are arranged on a support element (19) which can be rotated about an axis (24) parallel to the swivel axis (21) of the swivel gripper (16). The support element is provided at both ends with gear wheels which are connected via toothed belts (25) to gear wheels arranged on the pivot axis (21) in a rotationally fixed manner. This provides a drive for the support element which ensures that the pegs (18) maintain their vertical orientation in every pivoting position of the pivoting gripper (16), ie that the gripping elements (18) remain parallel to themselves at all times.

6 shows a further embodiment for driving the swivel gripper (16), which corresponds to the drive of the swivel gripper (16) according to FIG. 1. The swivel gripper (16), which is also designed like a frame, is rotatably mounted in two side guides (39) on a shaft (60) serving as a swivel axis. The side guides (39) are guided so as to be vertically displaceable in a manner not shown in vertical guide elements, for example by means of slide guides on guide rods. The sliding guides (39) are connected to endless, vertically directed toothed belts (38) which are guided around upper deflection rollers (50) and driven by lower drive wheels (51). The endless toothed belts (38) are connected to the side guides (39) by means of two deflection rollers (40, 41) and one gear wheel (42) each, which are mounted in the side guides (39). A drive motor (43) is in drive connection with the gear wheels (42) via intermediate wheels. The drive motor (43) is also in drive connection with a gearwheel (61) which is connected to the shaft (60) of the swivel gripper (16) in a rotationally fixed manner.

As long as the drive motor (43), which has a brake or a self-locking gear, is stationary in the embodiment according to FIG. 6, the two gear wheels (42) are blocked, so that a firm connection between the side guides (39) and the toothed belt (38) given is. When the drive motor (37) is running, depending on its direction of rotation, the side guides (39) are raised or lowered with the swivel gripper (16) held immovably. If the drive motor (43) is switched on, the swivel gripper (16) is swiveled depending on the respective direction of rotation of this drive motor (43). In addition, this drive motor (43) drives the gearwheels (42) so that the side guides (39) move realistically to the toothed belt (38), so that the pivoting movement of the pivoting gripper (16) is inevitably superimposed on a lifting or lowering movement. In addition to this combined swivel-lift or lower movement, the drive motor (37) can be switched on, so that a further lifting or lowering movement is superimposed on the swivel gripper (16).

The swivel gripper (16) contains a support element (19), which runs parallel to the shaft (60) serving as the swivel axis, for the pin-like gripping elements (18). This support element (19) is pivotally mounted about an axis (24) parallel to the shaft (60). A parallelogram guide (26) is provided between the support element (19) and the side guides (39), which ensures that the support element (19) remains parallel to itself with each pivoting movement, so that the pin-like gripping elements (18) are aligned vertically remain, regardless of which pivot position the swivel gripper (16) occupies.

The swivel gripper (16) can be adjusted by means of the drive shown in FIG. 6 in such a way that it can assume all the positions shown in FIG. 4 and carry out the corresponding movements. 6, that the swivel gripper (16) only occupies the position (16 '') in which the gripping elements (18) are located vertically below the transport device (11). In order to be able to transfer the roving bobbins (10 or 13) to the receptacle (17) and temporarily store them there, it is provided that the receptacle (17) is arranged in the change carriage by means of a pivoting drive (45). The receptacle (17), which can be pivoted about an axis (66) running in the longitudinal direction of the machine by means of a drive motor by means of a parallelogram arm (65), can be pivoted between a take-over position, in which it lies vertically below the transport device (11), and a retracted position will.

For spatial reasons it may be necessary that the pin-like gripping elements (18) have to be pivoted into and out of the creel during the retraction or extension so that the roving bobbins (10 or 13) leave their vertical position. For this purpose, the gripping elements (18) can additionally be pivoted about the axis (24) by means of drives, this movement being superimposed on the other combined movement. In the embodiment according to FIG. 5, a drive motor is connected to the swivel axis (21) so that it can be rotated in the direction of the double arrow shown on the right in FIG. 5. This movement is then transmitted to the axis (24) via the toothed belt (25). In the embodiment according to FIG. 6, the drive is connected directly to the axis (24) or installed in the parallelogram guide (26) in the form of a contractible and extendable element.

Claims (18)

1. Method for doffing full roving bobbins which are presented to a ring-spinning machine by a transport means, in exchange for emptied roving bobbins arranged in two rows in a creel of the ring-spinning machine, the doffing being carried out by means of a travelling doffing carriage provided with means for gripping the roving bobbins which means are arranged for picking up the full roving bobbins from the transport means and transferring them to the creel and for picking up the emptied roving bobbins from the creel and transferring them to the transport means, characterized in that the means for gripping the roving bobbins at first transfer full roving bobbins, after having them picked up from the transport means, to a holder of the doffing carriage serving as an intermediate store, then pick up the emptied roving bobbins from the creel and transfer them to the transport means, and finally pick up the full roving bobbins from the holder and transfer them to the creel.
2. Method for doffing full roving bobbins which are presented to a ring-spinning machine by a transport means, in exchange for emptied roving bobbins arranged in two rows in a creel of the ring-spinning machine, the doffing process being carried out by means of a travelling doffing carriage provided with means for gripping the roving bobbins which means are arranged for picking up the full roving bobbins from the transport means and transferring them to the creel and for picking up the emptied roving bobbins from the creel and transferring them to the transport means, characterized in that the means for gripping the roving bobbins transfer emptied roving bobbins, after having them picked up from the creel, to a holder of the doffing carriage serving as an intermediate store, then pick up the full roving bobbins from the transport means and transfer them to the creel, and finally pick up the empty roving bobbins from the holder and transfer them to the creel.
3. Method according to claim 1 or 2, characterized in that the means for gripping the roving bobbins pick up simultaneously a plurality of roving bobbins arranged in a row one behind the other, and doff them by groups.
4. Method according to any of claims 1 to 3, characterized in that the same means for gripping the roving bobbins are addressed to the holder of the doffing carriage, as well as to the transport means and the two rows of the creel.
5. Device for doffing full roving bobbins which are presented to a ring-spinning machine by a transport means, in exchange for emptied roving bobbins arranged in two rows in a creel of the ring-spinning machine, including a doffing carriage arranged to travel along the ring-spinning machine and means for gripping the roving bobbins which means can be addressed to the creel and to the transport means, characterized in that the doffing carriage (15) comprises a holder (17) for roving bobbins (10, 13) which serves as intermediate store for roving bobbins (10, 13) and to which the means (16) for gripping the roving bobbins (12, 13) can be addressed.
6. Device according to claim 5, characterized in that the means (16) for gripping the roving bobbins (10, 13) comprise a plurality of gripper elements (18) arranged in a row in the longitudinal direction of the machine.
7. Device according to claim 5 or 6, characterized in that the gripper elements (18) are arranged on a supporting element (19) which can be set into a combined upward and transverse movement by a drive system.
8. Device according to claim 5, 6 or 7, characterized in that the gripper elements (18) can be pivoted about a horizontal axis of the supporting element (19) by means of a drive.
9. Device according to any of claims 5 to 8, characterized in that the supporting element (19) is arranged on a pivoting element (20) which can be pivoted, by means of a pivot drive (22), about a horizontal pivot axis (21) extending in the longitudinal direction of the ring-spinning machine (12) and which can be displaced up and down in the vertical direction by means of a lifting drive (23, 27).
10. Device according to claim 9, characterized in that the supporting element (19) can be rotated about an axis (24) parallel to the pivot axis (21).
11. Device according to claim 10, characterized in that the supporting element (19) has assigned to it an aligning device (25, 26) acting to keep it in a position parallel to its initial position, in any pivoted position of the pivoting element (20).
12. Device according to any of claims 5 to 11, characterized in that the lifting drive (23, 27) and the pivot drive (22, 29) are coupled in such a way that the pivoting movement is forcedly superimposed upon the lifting or lowering movement over a predetermined pivoting range of the pivoting element (20).
13. Device according to claim 12, characterized in that the pivoting movement is superimposed upon the lifting or lowering movement in such a way that the supporting element (19) performs a movement which is adapted to the space available on the ring-spinning machine (12) and in the doffing carriage (15), but which is substantially parallel to the outer contour of the ring-spinning machine (12).
14. Device according to any of claims 5 to 13, characterized in that the lifting drive (23) and the pivot drive (22) are connected to a common drive motor (31), with a clutch (32) and a self-locking transmission element (33, 34) being arranged in the pivot drive (22).
15. Device according to claim 14, characterized in that a lifting motor (31) is provided for the pivoting element (20) and that the pivot drive (22) is derived from a pinion (36) coacting with a vertical, stationary toothed rod (25).
16. Device according to any of claims 1 to 13, characterized in that the lifting drive (27) comprises at least one revolving drive means (38) which is driven by a drive motor (37) and to which holding means (39) for the pivoting element (20), which extend in the vertical direction, are connected via connection means (40, 41, 42), the latter being equipped with a drive motor (23) of their own by means of which the holding means (39) can be moved in vertical direction and the pivoting element (20) can be pivoted at the same time.
17. Device according to any of claims 5 to 16, characterized in that the holder (17) of the doffing carriage (15) is mounted stationarily in the carriage (15).
18. Device according to any of claims 5 to 16, characterized in that the holder (17) of the doffing carriage (15) is equipped with a setting drive (45) and can be moved in a direction toward the gripper elements (18).

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