EP0036066B1 - Roving feed stop device for an open-end spinning device - Google Patents

Description

The present invention relates to a device for interrupting the sliver supply in open-end spinning devices with a disintegration device and a delivery device which is assigned a sliver clamp which can be actuated by a thread monitor or a winding monitor when the delivery roller continues to run.

In order to avoid complicated individual drives for the delivery rollers of the individual spinning stations, it is known to assign the delivery device to each spinning station a sliver clamp that can be actuated when the delivery roller continues to run (DE-AS 1957014). This sliver clamp is controlled by a control device, for example a thread monitor or the central control point for switching the machine off and on, and thus responds when a thread break occurs in order to interrupt the spinning process at the relevant spinning position; however, if there are any coils on the delivery device, the sliver is still pulled into the delivery device by the reel on the delivery roller even when the sliver clamp is actuated; This results in damage to the delivery device.

It is known to assign a catch element to the delivery roller (CH-PS 570475). With the help of this catch element, the rolls are stripped off the delivery roller. However, it is then necessary to remove this stripped roll from the area of the delivery roller in good time, since otherwise the housing opening provided for removing the stripped roll will clog and then, only a little late, serious damage to the delivery device can occur. Such damage occurs in particular when the delivery device is equipped with an apron for processing fibers of the middle or long staple area, since it is also practically impossible to avoid the formation of a wrap by a stripper.

Since it is thus not possible with the known device to avoid damage from windings on the delivery roller, it is the object of the present invention to provide a simple device which, in spite of the continuing delivery roller formation, reliably prevents a further sliver feed into the delivery device and so on prevents a predetermined maximum winding thickness from being exceeded, as a result of which damage to the delivery device is effectively avoided.

This object is achieved according to the invention in that a further sliver clamp, which can be actuated at the same time as the first sliver clamp, is arranged in front of the delivery device in the fiber transport direction at a distance which is at least as large as the average fiber stack length. The further sliver clamp according to the invention prevents, after its response when a roll occurs, many fibers get into the delivery device despite the delivery roller continuing to run. Rather, the retention of the sliver by means of the further sliver clamp pulls the sliver apart between the two sliver clamps, so that a certain maximum winding thickness cannot be exceeded. Depending on the design of the subject matter of the invention, this further sliver clamp can be actuated either by a winding monitor or by a thread monitor or, if both monitors are provided, by the monitor which responded previously. The distance according to the invention of this further sliver clamp in front of the clamping area of the delivery device is at least as large as the average length of the fiber stacks, so that despite the continuing delivery roller while the sliver is retained by the further sliver clamp, no fiber damage occurs. Rather, the fibers of the sliver are pulled apart without being destroyed.

In order to achieve the fastest possible interruption of the fiber feed into the delivery device when the further sliver clamp is triggered as a result of a winding on the delivery device, the point at which the sliver is pulled apart should be arranged as close as possible to the nip point of the delivery device. This is achieved according to the invention in that the distance at which the further sliver clamp is arranged in front of the clamping point of the delivery device is one to two times the mean fiber stack length that is being spun.

In principle, the further sliver clamp can be addressed by a single control device. However, since the first sliver clamp is always appropriately addressed when the further sliver clamp is actuated, the two sliver clamps are advantageously connected to one another in terms of control. If, for example, the further sliver clamp is addressed in this way even if a thread break occurs, it keeps the sliver within reach of the operator, even if the sliver leaves the clamping point of the first sliver clamp for some reason, so that the necessary re-insertion of the sliver into the delivery device is facilitated.

In order to enable simple adjustment of the further sliver clamp on the one hand and on the other hand to enable the further sliver clamp to work safely even when processing different strong slivers, according to a further feature of one embodiment of the invention the stationary part of this sliver clamp is essentially along the clamping path of the movable part of this sliver clamp adjustable.

A sliver guide designed as a loop catcher is expediently provided in front of the clamping point of the further sliver clamp. This sliver guide thus ensures that the sliver is inserted correctly into this sliver clamp regardless of the current location of the delivery can and also prevents loops from being fed into the spinning element, which would lead to irregularities in the yarn or, more likely, a yarn break. In order to obtain a simple construction, the sliver guide designed as a loop catcher is advantageously an integral part of this further sliver clamp.

If the delivery device has a stationary delivery roller and a feed trough which is pressed elastically against this, as well as a first sliver clamp consisting of a clamping lever working together with the feed trough, the clamping lever pivoting the feed trough away from the delivery roller when the thread monitor responds, according to a further advantageous embodiment of the invention the clamping end of the clamping lever is designed as a winding monitor and acts in response to the moving part of the further sliver clamp. According to a particularly simple and expedient embodiment of the device according to the invention, the movable part of the further sliver clamp is rigidly connected to the clamping lever of the first sliver clamp.

• Fig. 1 einen Querschnitt durch die für das Verständnis der Erfindung erforderlichen Teile einer Spinnstelle;
• Fig. 2 die bevorzugte Ausführung des Erfindungsgegenstandes unter Weglassung der die Spinnstelle verkleidenden Abdeckung im Schnitt;
• Fig. 3 die erfindungsgemässe Ausbildung des Erfindungsgegenstandes in der Perspektive mit geschlossener Abdeckung; und
• Fig. 4 eine Abwandlung des Erfindungsgegenstandes in der Perspektive.

Further details and advantages will be apparent from the description and drawings below. Show it:

• Figure 1 shows a cross section through the parts of a spinning station necessary for understanding the invention.
• Figure 2 shows the preferred embodiment of the subject of the invention with the omission of the cover covering the spinning station in section.
• Figure 3 shows the inventive design of the subject of the invention in perspective with the cover closed. and
• Fig. 4 shows a modification of the subject of the invention in perspective.

As shown in FIG. 1, the inside of the spinning rotor 3 is fed in a conventional manner with the aid of a delivery device 1 and a disintegration roller 2 to a fiber sliver 4 which is dissolved in individual fibers 40, where the individual fibers 40 enter the collecting trough and form a fiber ring 41. The fiber ring 41 is bound in a known manner into the end of a thread 42, which is drawn off through a thread draw-off tube 30 by means of a pair of draw-off rollers (not shown) and wound up in a conventional manner on a bobbin (not shown). The thread 42 is monitored on its way to the bobbin by a thread monitor 31. The negative pressure required for spinning in the spinning rotor 3 is generated in a known and therefore not shown manner.

In the exemplary embodiment shown, the delivery device 1 has a driven delivery roller 10 and a pressure roller 11 which is elastically supported on the latter, on the circumference of which a sensor 120 of a winding monitor 12 rests elastically and scans for the presence of windings 43 (see FIG. 2).

The opening roller 2 and the delivery device 1 are arranged in a housing 20 which further accommodates a sliver clamp 5 assigned to the delivery device 1. The sliver clamp 5 is located in front of the clamping area 13 of the delivery device 1 and has a movable clamping element 50, via which the sliver 4 is fed to the delivery device and which can cooperate with the housing wall 200 opposite it with respect to the sliver path. For this purpose, the clamping element 50 is pivotally mounted on its end facing away from the delivery device 1 and rests on the plunger 510 of an electromagnet 51 which forms the armature and which is excited when the thread monitor 31 responds.

Parallel to the thread monitor 31, the winding monitor 12 is arranged in the control circuit 310 of the electromagnet 51. Parallel to the electromagnet 51 is another electromagnet 52, which controls a further sliver clamp 6 with its plunger 520 forming the armature, which is arranged at a distance from the first sliver clamp 5.

The further sliver clamp 6 consists of a pivotable clamping lever 60, which rests on the plunger 520, and a stationary stop 61, against which the clamping lever 60 can be brought into contact. In the embodiment shown, the stop 61 is connected to the housing 20 via an intermediate piece 610. The intermediate piece has an opening designed as a sliver guide and loop catcher 611.

• Während des normalen Spinnvorganges passiert das Faserband 4 den Schlingenfänger 611, der Schlingen im Faserband 4 beseitigt und dafür sorgt, dass das Faserband 4 in einwandfreiem Zustand die Faserbandklemme 6 passiert. Ausserdem sorgt der Schlingenfänger 61 dafür, dass das Faserband 4 unabhängig von der gegenwärtigen Stellung der Lieferkanne stets in gleicher, genau festgelegter Richtung die Faserbandklemme 6 passiert, was für eine einwandfreie Funktion dieser Faserbandklemme 6 wichtig ist.

The device described above in construction works as follows:

• During the normal spinning process, the sliver 4 passes the loop catcher 611, which eliminates loops in the sliver 4 and ensures that the sliver 4 passes the sliver clamp 6 in perfect condition. In addition, the loop catcher 61 ensures that the sliver 4 always passes through the sliver clamp 6 in the same, precisely defined direction, regardless of the current position of the delivery can, which is important for the proper functioning of this sliver clamp 6.

After passing the sliver clamp 6, the sliver 4 passes through the sliver clamp 5 to the delivery device 1, which feeds the sliver 4 to the opening roller 2. The opening roller 2 dissolves the sliver 4 into individual fibers 40, which reach the spinning rotor 3 via the feed channel 21, where they are deposited in the form of a fiber ring 41 and where they are spun into the end of a thread 42 in the take-off and are drawn off by this . The one in the trigger located thread 42 is monitored by the thread monitor 31. If a thread break occurs, the thread monitor 31 closes the control circuit 310 and actuates the two electromagnets 51 and 52. With the aid of its plunger 510, the electromagnet 51 pivots the clamping element 50 against the fiber sliver 4, which is thus held between the clamping element 50 and the housing wall 200 forming a stop is while the delivery roller 10 continues. Thus, only a few individual fibers 40 located in the delivery device 1 are fed into the spinning rotor 3, so that a blockage of the spinning rotor 3 is effectively avoided.

After removal of the thread break, when the sensor 311 of the thread monitor 31 is again in its scanning position, the electromagnets 51 and 52 are de-energized again, so that the sliver clamps 5 and 6 release the sliver 4 again.

However, if, due to any circumstance, a roll 43 (FIG. 2) builds up on the delivery roller 10, the roll monitor 12 responds and now in turn actuates the electromagnets 51 and 52, whereupon the two sliver clamps 5 and 6 respond. As a result of the tension exerted on the fiber sliver 4 by the winding 43, the fiber sliver clamp 5 is no longer able to hold the fiber sliver 4 against the tension exerted. However, since the further sliver clamp 6 is located at a distance in front of the clamping point 13 of the delivery device 1 which is at least as large as the average fiber stack length, this further sliver clamp 6 can effectively hold back the sliver 4. The delivery device 1 pulls the fiber ribbon held back by the fiber ribbon clamp 6 apart without fiber damage occurring. After the winding 43 has been removed, the sensor 120 returns to its working position, so that to insert the sliver 4 into the delivery device 1, it is sufficient to temporarily bring the sensor 311 into its scanning position by hand, as a result of which both sliver clamps 5 and 6 the sliver 4 release until after restoring the normal spinning tension the sensor 311 is held in its scanning position by the thread 42 anyway.

If desired, the clamping element 50 and the clamping lever 60 can be assigned tension springs which hold the clamping element 50 and the clamping lever 60 in contact with the plunger 510 or 520 assigned to them.

The distance between the sliver clamp 6 and the clamping point 13 of the delivery device must on the one hand be so large that fiber damage is avoided, which is why the mean fiber stack length is selected as the minimum size for this distance. On the other hand, however, only as little fiber sliver 4 as possible should be drawn into the delivery device 1 after the winding monitor 12 has responded, in order to keep a roll 43 that has already occurred as small as possible, so that damage to the delivery device 1 is avoided and the removal of the Wikxcfs _{43 9} hny difficulties can be. Such a risk of damage to the delivery device 1 varies in size depending on its design. If the fiber is fed with the help of straps, for example, it is particularly important to interrupt the delivery of fibers quickly, since the straps are particularly sensitive to damage.

In the embodiment shown in FIG. 1, both the thread monitor 31 and the winding monitor 12 are connected in parallel with one another and in series with the electromagnets 51 and 52 connected in parallel with one another, so that both when the thread monitor 31 responds and when the winding monitor is activated address both the first sliver clamp 5 and the second sliver clamp 6. The first and second sliver clamps 5 and 6 are thus connected to one another in terms of tax. However, it is also possible to actuate the first sliver clamp 5 alone in the event of a thread break from the thread monitor 31, while the second sliver clamp 6 is addressed only by the winding monitor 12 when the supply roll 10 is formed. Even with such a design of the spinning device, the fiber feeding into the spinning rotor 3 is reliably prevented in the event of a thread break, while pulling apart of the fiber sliver 4 is ensured in the event of winding formation, and thus exceeding a maximum winding thickness is prevented.

In the embodiment shown in FIG. 1, fiber damage when the first sliver clamp 5 responds is avoided in that the clamping pressure of the sliver clamp 5 is chosen only so strongly by appropriate arrangement of the electromagnet 51 relative to the clamping element 50 and by appropriate selection of the strength of the electromagnet 51, that individual fibers 40 can still be pulled out of the sliver 4, but the sliver 4 is effectively retained for the rest.

A device in which the fiber damage to the first sliver clamp 5 is avoided in a simpler manner is shown in FIG. 2. The delivery device 1 shown here has a delivery roller 10 and a feed trough 14 which resiliently supports it. On the side facing the delivery roller 10, a clamping lever 53 can be brought into contact, which has a sliver guide funnel 54, so that the sliver 4 can pass between the feed trough 14 and the clamping end 530 of the clamping lever 53 to the delivery roller 10. The drive end 531 of the clamping lever 53 designed as a two-armed lever rests on the plunger 520 of the electromagnet 52. A clamping lever 62, which cooperates with the stop 61, is rigidly connected to the clamping lever 53.

When a thread break occurs, the electromagnet 52 is actuated by the thread monitor 31 (FIG. 1). The plunger 520 of the electromagnet 52 now pivots the clamping lever 53, the clamping end 530 of which moves towards the feeder de 14 moves and lifts it off the delivery roller 10 and thereby clamps the sliver 4 between itself and the feed trough 14. Thus, on the one hand, the clamping between delivery roller 10 and feed trough 14 is released and, on the other hand, this sliver clamp 5 retains the sliver 4 by clamping between the clamping end 530 of the clamping lever 52 and feed trough 14, so that - without fiber damage - the delivery of further individual fibers 40 into the spinning rotor 3 is prevented . Since the clamping lever 62 of the sliver clamp 6 is rigidly connected to the clamping lever 53 - so that the sliver clamps 5 and 6 are in turn connected to one another for control purposes - the clamping lever 62 additionally secures the sliver 4 by clamping between itself and the stop 61.

The Kiemmhebei 53 is designed in the embodiment shown in Fig. 2 as a winding monitor, so that an additional sensor 120 (Fig. 1) is not required. If desired, the clamping lever 53 can also be provided with a wiper or can be assigned to it. If a roll 43 occurs on the delivery roller 10, it will abut the clamping end 530 of the clamping lever 53 directly or via a scraper, so that the clamping lever 53 pivots, the feed trough 14 is lifted from the delivery roller 10 and the sliver 4 between the clamping end 530 of the Clamping lever 53 and the feed trough 4 is clamped. By pivoting the clamping lever 53 and thus also the clamping lever 62, the fiber sliver 4 is additionally clamped in the fiber sliver clamp 6, so that the fiber sliver 4 is pulled apart between the two fiber sliver clamps 5 and 6 when the delivery roller 10 continues to pull the sliver 43 via the winding 4 exercises.

Since a thread break usually occurs simultaneously with the formation of a bobbin 43, a clamping lever 53 not designed as a bobbin winder can also be used under certain circumstances. If, however, the clamping lever 53 also serves as a winding monitor, the sliver clamps 5 and 6 are actuated either from the thread monitor 31 or from the clamping lever 53, depending on which one responds earlier.

In order to adjust the sliver clamp 6 regardless of manufacturing inaccuracies and, if desired, to adapt to different sliver thicknesses, the stationary part of the sliver clamp 6 is formed with the stop 61 with a link-like holder 63, the elongated holes 64 of which adjust the stop 61 along the clamping path of the moving part, ie of the clamping lever 62. Such an adjustment option is particularly expedient if the two sliver clamps 5 and 6 are mechanically connected to one another in order to allow the sliver clamp 6 to be adapted to the sliver clamp 5.

FIG. 3 shows the device shown in FIG. 2 without cover 22 in its three working positions.

At the work station, the spinning end is uninterrupted, the thread 42 is continuously withdrawn from the spinning station, and the sliver 4 is fed continuously.

A winding 43 (FIG. 2) has occurred at the spinning station II, so that the fiber sliver 4 has been pulled apart as a result of the response of the fiber sliver clamp 6. In addition, a thread break has occurred at this spinning station II, which usually occurs at the same time as the beginning of the winding formation, but at the latest when the sliver supply is interrupted.

Finally, only a thread break occurred at the spinning station 111, without a winding being formed at the same time. The sliver clamps 5 (Fig. 2) and 6 (Fig. And 3) have responded and hold the sliver 4 back.

Fig. 4 shows an alternative solution, in which the sliver clamp 6 has a two-armed clamping lever 65, one arm 650 of which is held by a tension spring 66 in contact with the drive end 531 of the clamping lever 53, while the other arm 651 when the electromagnet 52 is excited with the interposition of the clamping lever 53 is brought to bear against the cover 22 serving as a stop. The arm 651 of the clamping lever 65 has a guide hole 652 for guiding the sliver 4.

When the sliver clamp 5 is released, the sliver clamp 6 is also released in this embodiment. Likewise at the same time, both sliver positions 5 and 6 reach their clamping position by responding to the electromagnet 52 or when a coil 43 is felt by the clamping lever 53 designed as a winding monitor.

1 to 3, the fiber guide forming a loop catcher 611 is an integral part of the sliver clamp 6. FIG. 4 shows that it is entirely possible to form a loop catcher 67 independently of the sliver clamp 6.

Claims (8)

1. Apparatus for interrupting the fibre sliver supply in open-end spinning devices which includes an opening device and also a delivery device, a fibre sliver clamp being associated with the latter, which fibre sliver clamp is actuatable by a yarn monitor or a lap monitor when the supply roller continues to run, characterized by the fact that a second fibre sliver clamp (6) is arranged before said delivery device (1) in the transport direction at a distance which is at least as large as the average fibre staple length, this second fibre sliver clamp (6) being actuatable simultaneously with the first fibre sliver clamp (5).

2. Apparatus according to claim 1 characterized by the fact that the distance at which the second fibre sliver clamp (6) is arranged in front of the clamping nip (13) of the delivery device (1) amounts to one to two times the average fibre staple length arriving for spinning.

3. Apparatus according to claim 1 or 2 characterized by the fact that the second fibre sliver clamp (6) is operable to be actuated with the first fibre sliver clamp (5).

4. Apparatus according to any of claims 1 to 3 characterized in that the stationary part (61) of the second fibre sliver clamp (6) is adjustable in the direction of the clamping movement of the movable clamping part (62).

5. Apparatus according to any of claims 1 to 4 characterized in that a fibre sliver guide constructed as a loop catcher (611, 67) is positioned in front of the clamping point of the second fibre sliver clamp (6).

6. Apparatus according to claim 5 characterized in that the fibre sliver guide constructed as a loop catcher (611) is an integrated component of the second fibre sliver clamp (6).

7. Apparatus according to any of claims 1 to 6 wherein the delivery device includes a stationary delivery roller and a feed trough elastically pressed thereagainst, and wherein the first fibre sliver clamp includes a clamping lever cooperating with the feed trough, the clamping lever pivoting the feed trough away from the delivery roller when the yarn monitor is activated, characterized in that the clamping end (530) of the damping lever (53) is constructed as a lap monitor and upon sensing a lap buildup acts on the movable part (62, 65) of the second fibre sliver clamp (6).

8. Apparatus according to claim 7, characterized by the fact that the movable part (62) of the second fibre sliver clamp (6) is rigidly connected to the clamping lever (53) of the first fibre sliver clamp (5).

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