EP4151577A1 - Thread-moving device for a thread-joining unit of a textile machine producing cross-wound bobbins - Google Patents

Abstract

The invention relates to a thread laying device (18) for a thread connecting unit of a textile machine producing cross-wound bobbins, with a gripper tube (1) with a gripper tube opening (8) which can be subjected to suction air, a gripper tube flap (2) arranged on the gripper tube (1) and between a gripper tube opening (8) releasing open position and a closed position closing the gripper tube mouth (8) and a thread laying hook (3) arranged in the area of the gripper tube flap (2). In order to provide a thread transfer device in which the probability of the thread being wrapped around the gripper tube or the gripper tube flap is significantly reduced compared to the thread transfer devices known from the prior art, it is provided that the thread transfer hook (3) is arranged in such a way that it 2) projects beyond an outer surface of the gripper tube flap (2) and is arranged at least flush with the outer surface or set back with respect to it when the gripper tube flap (2) is in the open position.

Description

• einem Greiferrohr mit einer mit Saugluft beaufschlagbaren Greiferrohrmündung,
• einer an dem Greiferrohr angeordneten Greiferrohrklappe, die zwischen einer die Greiferrohrmündung freigebenden Öffnungsstellung und einer die Greiferrohrmündung verschließenden Verschlussstellung verstellbar ist und
• einem im Bereich der Greiferrohrklappe angeordneten Fadenverlegungshaken.

The invention relates to a thread laying device for a thread connecting unit of a textile machine that produces cheeses

• a gripper tube with a gripper tube mouth that can be subjected to suction air,
• a gripper tube flap which is arranged on the gripper tube and can be adjusted between an open position releasing the gripper tube mouth and a closed position closing the gripper tube mouth and
• a thread laying hook arranged in the area of the looper tube flap.

In textile machines that produce cross-wound bobbins, a thread is transferred from a pay-off bobbin to a cross-wound bobbin. Spinning cops produced on a ring spinning machine, for example, can be used as the pay-off bobbin, the thread of which is rewound onto cross-wound bobbins for better further processing.

In such textile machines, in the event of a thread breakage or when changing the pay-off spools, an automatic thread connection mechanism and, if necessary, an automatic cop change mechanism are activated. First, a suction nozzle of the thread connection unit is placed on the surface of the winding package, which rotates slowly against the winding direction. After the upper thread has been gripped, the suction nozzle pivots into its initial position, in which the suction nozzle opening is positioned below a splicing device, and thereby inserts the upper thread into a splicing device.

Essentially at the same time as the suction nozzle, a gripper tube of the thread-laying device, which is also part of the thread-joining unit, pivots from its starting position, in which it is arranged during normal winding operation, into a lower receiving position, where it picks up a thread tensioner or a thread Clamping device held, deducted from the bobbin lower thread. The gripper tube then pivots into an upper transfer position and brings the lower thread with it. When the gripper tube swivels into its transfer position, the lower thread is positioned in the splicing device.

To accommodate the lower thread, the gripper tube has a gripper tube flap at the end when the gripper tube is pivoted into the pick-up position, it is moved into its open position by means of a shift gate, in which the vacuum sucks the lower thread into the gripper tube. When leaving the pickup position of the gripper tube, the gripper tube flap is closed again and clamps the thread so that it can be safely transferred to the splicing device. When the gripper tube is swiveled up into the transfer position, the gripper tube cuts the tensioning path of the upper thread with the thread transfer hook, takes this thread with it and positions it in the splicing device in a functional manner. When moving into the transfer position, the gripper tube flap is opened so that the upper thread and lower thread are inserted taut in the splicing device.

During normal winding operation, the gripper tube is arranged in its starting position at a distance from the normal thread path. In this position, the gripper tube is at such a great distance from the running thread that, for example after a thread breaks, the falling thread should not wind itself around the gripper tube or the gripper tube flap, but rather falls past the gripper tube. However, it has been shown that after a break or cut, the thread often does not remain in its regular course, but can move uncontrollably due to the thread tension, which suddenly decreases. The distance from the regular yarn path therefore does not offer sufficient protection against entanglement of the rapier tube or the rapier tube flap. The subsequent processes are negatively influenced by this entanglement, which means that the lower thread cannot be reliably grasped and therefore also no secure splice connection can be produced. In the worst case, the entanglement leads to a shutdown of the textile machine, which requires manual intervention by the operating personnel to start it up.

Proceeding from this, the object of the invention is to provide a thread-laying device in which the probability of the thread being looped around the gripper tube or the gripper-tube flap is significantly reduced compared to the thread-laying devices known from the prior art.

The invention solves the problem by a thread laying device with the features of claim 1. Advantageous developments of the invention are specified in the dependent claims.

The thread laying device according to the invention for a thread connecting unit has that Gripper tube with the gripper tube mouth acted upon by suction air, the gripper tube flap adjustable between the open position releasing the gripper tube mouth and the closed position closing the gripper tube mouth, and the thread laying hook arranged in the area of the gripper tube flap. As part of a thread connecting unit, the thread laying device serves in the manner described above to arrange the lower thread from a position arranged below the splicing device for connection to an upper thread in a splicing device, with the positioning of the lower thread in the splicing device by pivoting the gripper tube of the thread laying hook the clamping path of the upper thread arranged in the splicing device and positions it functionally in the splicing device.

It is characteristic of the thread laying device according to the invention that the thread laying hook is arranged in such a way that, in the closed position of the rapier tube flap, it projects beyond an outer surface of the rapier tube flap and, in the open position of the rapier tube flap, is arranged at least flush with the outer surface or set back with respect to it, so that the thread laying hook then does not protrude protrudes the outer surface of the gripper tube flap.

In the closed position of the rapier flap, the thread transfer hook protrudes over the outer surface of the rapier flap and thus reliably ensures that when the rapier pipe is adjusted to the transfer position in which the rapier flap is closed, the upper thread is reliably pressed over the thread transfer hook into the splicing device. At the same time, however, the thread transfer hook harbors the risk of entangling the gripper tube flap, which can lead to disruptions in the textile machine.

In order to avoid entanglement, it is provided according to the invention that the thread transfer hook is arranged at least flush with the outer surface or set back with respect to it in the open position of the gripper tube flap. As a result, loopings around the gripper tube flap that may be present in the starting position of the gripper tube as a result of the interaction of the lower thread with the thread laying hook are automatically eliminated. Adjusting the gripper tube to the receiving position, in which the gripper tube flap is opened to receive the lower thread in the gripper tube opening, results in the thread laying hook being pulled back relative to the outer surface until it is at least flush with the outer surface or set back relative to it. whereby the thread transfer hook disengages from any loopings surrounding the gripper tube flap. The wraps can then easily slide off over the gripper tube flap, so that disturbances caused by wraps are reliably avoided.

During a subsequent adjustment of the gripper tube into the transfer position, the gripper tube flap is then closed when leaving the lower receiving position, as a result of which the lower thread arranged in the gripper tube mouth is also mechanically secured to the gripper tube flap. The thread laying hook returns to a position protruding over the outer surface, so that it then reliably presses the upper thread into the splicing device in the area of the transfer position.

The thread laying device according to the invention thus reliably prevents faults due to looping of the gripper tube in the area of the gripper tube flap or existing looping as a result of interaction with the thread laying hook is automatically released after the looping, if the gripper tube flap is arranged in the open position, easily passes over the surface of the gripper tube flap can slip. At the same time, it is ensured that the upper thread is reliably positioned in the splicing device via the thread transfer hook.

According to a further embodiment of the invention, the thread traversing device has a thread guide element which is arranged in the area of the rapier tube flap in such a way that it protrudes beyond the outer surface of the rapier tube flap in the closed position of the rapier tube flap and is arranged at least flush with the outer surface or set back in relation to it in the open position of the rapier tube flap is.

In certain textile machines equipped with round magazines, the thread guide element serves to insert the lower thread in the splicing device, in contrast to the cases of a “normal” thread breakage, namely when changing the cop. In the event of a cop change, an empty tube arranged on a arbor or a cop that cannot be unwound further without special preparation, it is transported away via a conveyor belt. Then the circular magazine of a changing device is indexed so that one of the reserve bobbins is brought into the delivery position of the circular magazine and via an opening in the magazine floor, the bobbin slide and the Centering flap reaches the arbor pivoted in the receiving position. The arbor then swivels back into the unwinding position with the new pay-off spool. The thread end of the pay-off spool held in the central suction nozzle of the round magazine forms a lower thread strand, which is laid by an auxiliary gripper in the direction of a thread tensioner and held there.

At the time of the bobbin change, the gripper tube is in its starting position, spaced apart from the regular thread path. After replacing the new pay-off spool, the gripper tube pivots into the upper transfer position, with the gripper tube mouth describing a circular path. The gripper tube flap arranged in the area of the gripper tube mouth catches the lower thread with its thread guide element and moves it in the direction of the splicing device. Since the circular path also crosses the path of the upper thread, the upper thread is also grasped with the thread laying hook arranged on the gripper tube and also laid in the direction of the splicing device. In the configuration of the thread transfer device with a thread transfer hook and a thread guide element, in the closed position of the gripper tube flap, the thread transfer hook usually protrudes from a front side of the gripper tube flap, whereas the thread guide element protrudes from a rear side of the outer surface.

The arrangement of the thread guide element such that it is at least flush with the outer surface or set back in relation to this when the rapier tube flap is in the open position ensures, if a thread guide element is used, that any entanglements that may form on this element when the rapier tube flap is opened are automatically wiped off via the outer surface can disengage after the wraps in the open position with the thread guide element. If the thread-laying device is configured with a thread-guiding element in addition to the thread-laying hook, faults due to undesired looping of the gripper tube flap are also reliably avoided and at the same time the area of use of the thread-laying device is increased.

The arrangement of the thread laying hook and/or the thread guide element in such a way that in the closed position they protrude over the outer surface of the gripper tube flap and in the open position are arranged at least flush or retracted in relation to it, so that entanglements are avoided or are automatically dissolved is basically free selectable. According to a further embodiment of the invention, however, it is provided that the gripper tube flap is arranged on a flap support connected to the gripper tube so that it can pivot between the open position and the closed position, the flap support being connected to the thread laying hook and/or the thread guide element in such a way that these are in the closed position protrude through a slit-like passage opening on the gripper tube flap and are arranged retracted in the passage opening in the open position.

According to this embodiment of the invention, the thread laying hook and/or the thread guiding element are connected to the flap support or configured in one piece with it. In the closed position of the gripper tube flap, the thread laying hook and/or the thread guide element protrude through an adapted slot-like passage opening on the gripper tube flap and in the closed position protrude beyond the outer surface of the gripper tube flap. The rapier flap is in turn pivotably connected to the flap carrier, whereby when the rapier flap is moved from the closed position to the open position, the thread laying hook and/or the thread guide element are adjusted relative to the slit-like passage opening, which extends in the pivoting direction of the rapier flap, such that these the open position are arranged in the slot-like passage opening in such a way that they no longer protrude beyond the outer surface of the gripper tube flap.

This embodiment of the invention ensures in a particularly reliable manner a flat outer surface of the gripper tube flap in the open position of the same, as a result of which loopings can reliably slide off over the gripper tube flap. The use of a slit-like passage opening ensures in particular that the outer surface is formed free of projections that promote entanglements.

According to a further embodiment of the invention, it is provided that the gripper tube flap has a guide section lying against an outside of the flap carrier. According to this embodiment of the invention, it is provided that the gripper tube flap rests against a side of the flap carrier facing away from the gripper tube mouth, thereby ensuring a particularly reliable, trouble-free pivoting movement of the gripper tube flap between the open position and the closed position. A jamming of the gripper tube flap due to a tilting pivoting movement between the The open position and the closed position is thus prevented in a particularly reliable manner.

In the closed position, the gripper tube flap closes the gripper tube mouth and releases it in the open position, so that the lower thread can then be picked up in the pick-up position via a suction flow applied to the gripper tube mouth. According to a particularly advantageous embodiment of the invention, it is provided that the gripper tube flap has a closure element that closes the gripper tube mouth in the closed position, which particularly preferably has a shape adapted to the gripper tube mouth, in particular as a plug arranged concentrically to the gripper tube mouth in the closed position. The use of a correspondingly adapted closure element ensures in a particularly reliable manner that the gripper tube mouth is closed in the closed position of the gripper tube flap, thereby interrupting the suction flow and at the same time ensuring reliable mechanical clamping of a lower thread arranged in the gripper tube mouth. In addition, with a corresponding configuration of the closure element, it can be ensured in a particularly reliable manner that the gripper tube flap is closed under the effect of the prevailing negative pressure at the gripper tube mouth.

According to a further embodiment of the invention, it is provided that the gripper tube flap has a control cam that can be brought into engagement with a control link. According to this embodiment of the invention, the control cam is used to reliably open the gripper tube flap in the area of the pick-up position and the upper transfer position, for which purpose the control cam engages with corresponding links arranged on the textile machine and, in cooperation with the links, causes a pivoting movement of the gripper tube flap causes. Separate opening devices for adjusting the gripper tube flap can thus be dispensed with, with a reliable movement of the gripper tube flap between the open position and the closed position in the pick-up position and transfer position being able to be ensured via the control cam and the corresponding design of the links.

In order to arrange the flap support on the gripping tube, an advantageous embodiment provides that the flap support has a clamping element for detachably fastening the flap support on the gripping tube. The use of the clamping element, for example a clamping ring coaxially enclosing the gripper tube in the area of the gripper tube mouth enables simple and reliable assembly of the gripper tube flap, which is pivotably connected to the flap carrier, on the gripper tube. The position of the gripper tube flap can be aligned in a particularly precise manner with respect to the gripper tube mouth via the clamping element. In addition, the use of a clamping element enables the gripper tube flap to be easily replaced in the event of damage.

In order to avoid a disturbing wrapping around the gripper tube flap in a special way, it is provided according to a further development of the invention that the gripper tube flap has a flat and/or convex outer surface. According to this embodiment of the invention, it is provided that the outer surface of the gripper tube flap does not have a depression that promotes an entanglement. A flat and/or convex outer surface promotes a good sliding of wraps in a special way. It is particularly advantageously provided that a front side of the gripper tube flap, over which the thread laying hook protrudes in the closed position, and a rear side of the gripper tube flap, over which the optional thread guide element protrudes in the closed position, are connected to one another via an arcuate section of the outer surface, with an inner angle has an angle >90° between the front side and the back side of the gripper tube flap, as a result of which entanglements are avoided in a particularly reliable manner.

Fig. 1

eine erste perspektivische Ansicht einer Fadenverlegungsvorrichtung mit einer in einer Verschlussstellung angeordneten Greiferrohrklappe;

Fig. 2

eine zweite perspektivische Ansicht der Fadenverlegungsvorrichtung von Figur 1;

Fig. 3

eine dritte perspektivische Ansicht der Fadenverlegungsvorrichtung von Figur 1;

Fig. 4

eine erste perspektivische Ansicht der Fadenverlegungsvorrichtung von Figur 1 mit der in einer Öffnungsstellung angeordneten Greiferrohrklappe;

Fig. 5

eine zweite perspektivische Ansicht der Fadenverlegungsvorrichtung von Figur 4;

Fig. 6

eine dritte perspektivische Ansicht der Fadenverlegungsvorrichtung von Figur 4;

Fig. 7

eine erste perspektivische Ansicht der Greiferrohrklappe der Fadenverlegungsvorrichtung von Figur 1 an einem Klappenträger;

Fig. 8

eine zweite perspektivische Ansicht der Greiferrohrklappe der Fadenverlegungsvorrichtung von Figur 1;

Fig. 9

eine dritte perspektivische Ansicht der Greiferrohrklappe der Fadenverlegungsvorrichtung von Figur 1;

Fig. 10

eine erste perspektivische Ansicht des an einem Greiferrohr der Fadenverlegungsvorrichtung von Figur 1 angeordneten Klappenträgers und

Fig. 11

eine zweite perspektivische Ansicht des Klappenträgers der Fadenverlegungsvorrichtung von Figur 1.

An embodiment of the invention is explained below with reference to the drawings. In the drawings show:

1

a first perspective view of a thread transfer device with a arranged in a closed position gripper tube flap;

2

a second perspective view of the thread laying device of figure 1 ;

3

a third perspective view of the thread laying device of figure 1 ;

4

a first perspective view of the thread laying device of figure 1 with the gripper tube flap arranged in an open position;

figure 5

a second perspective view of the thread laying device of figure 4 ;

6

a third perspective view of the thread laying device of figure 4 ;

7

a first perspective view of the gripper tube flap of the thread transfer device from figure 1 on a flap carrier;

8

a second perspective view of the gripper tube flap of FIG Thread laying device from figure 1 ;

9

a third perspective view of the gripper tube flap of the thread transfer device of figure 1 ;

10

a first perspective view of the thread laying device on a gripper tube of figure 1 arranged flap carrier and

11

a second perspective view of the flap carrier of the thread laying device of figure 1 .

In figure 1 a thread laying device 18 for a thread connection unit (not shown here) of a textile machine that produces cross-wound bobbins is shown in a perspective view. The yarn laying unit 18 has an angled gripper tube 1 which can be pivotally connected via a hollow gripper tube shaft 7 to a suction air source on the textile machine.

At the opposite end of the gripper tube shaft 7, the gripper tube 1 has a gripper tube flap 2, which is between a in the Figures 1 to 3 shown closed position and in the Figures 4 to 6 shown open position is pivotally mounted on a connected to the gripper tube 1 flap carrier 5. In the closed position, the gripper tube flap 2 closes a gripper tube mouth 8 of the gripper tube 1 , whereas in the open position of the gripper tube flap 2 , the gripper tube flap 2 releases the gripper tube mouth 8 . For the pivotable arrangement of the gripper tube flap 2 in the area of the gripper tube mouth 8, a bolt 6 is used, which forms the pivot axis of the gripper tube flap 2 and extends through opposite bolt receptacles 10a, 10b of the gripper tube flap 2 and is fastened to the flap carrier 5 in a bolt receptacle 9 (cf. Figure 7 to 9 ).

To position the gripper tube flap 2 on the gripper tube 1 opposite the gripper tube mouth 8, an annular clamping body 11 is used, which is connected via screws 17 to the flap carrier 5 and encloses the gripper tube 1 coaxially in the assembled position.

In the in the Figures 1 to 3 and 7 shown closed position of the gripper tube flap 2, a thread laying hook 3 and a thread guide element 4 protrude through a slit-shaped passage opening 13 on the gripper tube flap 2, so that they protrude over an outer surface 19 of the gripper tube flap 2. The thread laying hook 3 protrudes over a front side 21 and the thread guide element 4 beyond a rear side 22 of the gripper tube flap 2 .

When the gripper tube 1 pivots about the longitudinal axis of the gripper tube shaft 7, a control cam 16 engages in the region of a lower receiving position and an upper transfer position of the gripper tube 1 with a control link on the textile machine (not shown here) and causes the gripper tube flap 2 to pivot into the den Figures 4 to 6 shown open position in which the gripper tube mouth 8 is released. When the gripper tube flap 2 is moved into the open position, the thread-laying hook 3 and the thread-guiding element 4 are relatively displaced within the slit-shaped passage opening 13 into a position in which they are retracted from the outer surface 19, i.e. no longer over the front 21 or rear 22 to preside Possibly existing wraps, which abut the thread transfer hook 3 and/or the thread guide element 4 , are stripped off over the outer surface 19 of the gripper tube flap 2 .

To close the gripper tube mouth 8 in the closed position of the gripper tube flap 2, a closure element 12 adapted to the gripper tube mouth 8 is arranged on an inside of the gripper tube flap 2 on a closure element carrier 15, which is arranged concentrically to the gripper tube mouth 8 in the closed position. The closure element 12 is held on the gripper tube flap 2 by a screw (not shown here) which can be screwed into the closure element carrier 15 and which extends through a bore 14 on the front side 21 of the gripper tube flap 2 .

The underside of the gripper tube flap 2 bears against an outer side 20 of the flap carrier 5 so that a reliable pivoting movement about the pivot axis formed by the bolt 6 is ensured.

reference list

1

gripper tube

2

gripper tube flap

3

thread laying hook

4

thread guide element

5

flap carrier

6

bolt

7

gripper tube shaft

8th

gripper tube muzzle

9

Bolt mount (flap carrier)

10a, 10b

Bolt mount (gripper tube flap)

11

clamping body

12

closure element

13

passage opening

14

drilling

15

locking element carrier

16

control cam

17

screw

18

thread laying device

19

outer surface

20

outside

21

front

22

back

Claims (9)

Thread laying device (18) for a thread connection unit of a textile machine producing cheeses, with - a gripper tube (1) with a gripper tube mouth (8) which can be subjected to suction air, - a gripper tube flap (2) arranged on the gripper tube (1) and adjustable between an open position releasing the gripper tube mouth (8) and a closed position closing the gripper tube mouth (8) and - a thread transfer hook (3) arranged in the area of the hook tube flap (2), characterized in that
the thread laying hook (3) is arranged in such a way that in the closed position of the rapier flap (2) it projects beyond an outer surface (19) of the rapier flap (2) and in the open position of the rapier flap (2) it projects at least flush with the outer surface (19) or opposite it is set back. Thread traversing device (18) according to Claim 1, characterized by a thread guide element (4) which is arranged in the region of the rapier tube flap (2) in such a way that it projects beyond the outer surface (19) of the rapier tube flap (2) when the rapier tube flap (2) is in the closed position and in the open position of the gripper tube flap (2) is arranged at least flush with the outer surface (19) or set back with respect to it. Thread laying device (18) according to Claim 1 or 2, characterized in that the gripper tube flap (2) is arranged on a flap carrier (5) connected to the gripper tube (1) so that it can pivot between the open position and the closed position, the flap carrier (5) being connected in such a way with connected to the thread laying hook (3) and/or the thread guide element (4) in such a way that, in the closed position, they protrude through a slit-like opening (13) on the gripper tube flap (2) and are arranged in the opening (13) in the open position. Yarn laying device (18) according to one or more of the preceding Claims, characterized in that the gripper tube flap (2) has a guide section bearing on an outside (20) of the flap carrier (5). Thread laying device (18) according to one or more of the preceding claims, characterized in that the gripper tube flap (2) has a closure element (12) which closes the gripper tube mouth (8) in the closed position. Thread laying device (18) according to one or more of the preceding claims, characterized in that the closure element (12) has a shape adapted to the gripper tube mouth (8), in particular as a plug arranged concentrically to the gripper tube mouth (8) in the closed position. Thread laying device (18) according to one or more of the preceding claims, characterized in that the gripper tube flap (2) has a control cam (16) which can be brought into engagement with a control link. Thread laying device (18) according to one or more of the preceding claims, characterized in that the flap carrier (5) has a clamping body (11) for the detachable attachment of the flap carrier (5) to the gripper tube (1). Thread laying device (18) according to one or more of the preceding claims, characterized in that the gripper tube flap (2) has a flat and/or convex outer surface.

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