EP0504111A1 - Procedure and device for making a bobbin - Google Patents

Abstract

In a process for making a bobbin having a desired bobbin diameter by winding a roving (4) or the like onto a tube (2), especially by means of a flyer (7) and a press finger (12) in a slubbing machine (flyer), the flyer (7) and tube (2) or bobbin are to be moved relative to one another within a winding stroke limited by limit switches (18, 19, 22) or the like. After the desired diameter has been reached, additional layers (23) are wound onto the bobbin surface then present and form a terrace-like step (26) and, relative to the bobbin surface (27), a recess (28) for the insertion of a roving end (20). <IMAGE>

Description

The invention relates to a method for producing a spool with a desired spool diameter by winding a fuse or the like onto a sleeve by means of a transfer element, the transfer element and the sleeve or spool being moved relative to one another within a winding stroke limited by limit switches or the like. and an apparatus therefor and a coil produced by the method.

As is known, a roving which still consists of relatively loose fibers is wound into a bobbin in a roving device.

The flyer, in which a fibrous fuse is guided from a drafting system through a hollow arm of a wing to a bobbin, is known in particular as a pre-spinning device. This wing has the shape of a suspended, rotating fork, with a counter arm being assigned to the hollow arm as a counterweight. Both arms rotate around the spool or at the start of the winding process around a sleeve, whereby the fuse is pulled out of the hollow arm by the winding.

When winding itself, either the sleeve or spool or the wing can perform a winding stroke, so that the winding layers are arranged helically on the spool.

Each time an upper and a lower reversal point of the winding stroke is reached, the spool or wing is displaced in the opposite stroke direction, so that the spool is finally applied layer by layer to the sleeve. In general, the reversal of the winding stroke is controlled by limit switches, but other electronic aids are also conceivable here. If, for example, mechanical limit switches are used, they are arranged on spindles, so that they are moved a little towards each other each time they are reversed. This creates the known coils with conical flanks.

Once a desired coil diameter has been reached, the fuse should be torn off so that a coil end remains on the coil. Tearing off should take place automatically. A particularly preferred example is shown in CH-PS 626 663, where the fuse is torn off by stopping the spool and wing and then moving the wing and spool relative to one another. The sliver end lies against the surface of the spool and, due to its fibrous nature, usually finds sufficient hold on the spool surface. In contrast, according to DE-OS 38 03 521, for example, the sliver end must be pressed against the coil by a separate pressing device, which is very complicated in terms of construction.

It is disadvantageous in both cases that the sliver end lies relatively freely on the coil surface. As is known, such a roving bobbin can be transported automatically for further processing. This happens, for example, on monorails on which the finished spools hang close together and freely. During the operation of this monorail, it happens that the coils touch, where they rub on the surface. This leads to a detachment of the sliver end from the coil surface, so that the sliver end falls down, can get caught and is dragged along. This can also be done under the influence of drafts or sudden movements of the transport device. This process is extremely undesirable because it leads to operational problems.

The object of the invention is to eliminate this disadvantage and, in particular, to protect the sliver end from unintentional detachment from the coil surface.

The solution to the problem is that after reaching the desired diameter, additional layers are wound onto the then existing coil surface, which form a terrace-shaped step with a shortened winding stroke and a niche in the coil surface for inserting a sliver end.

While it was previously only known that after reaching the last reversal point of the winding stroke, the fuse was torn off after a few turns, now several additional layers are to be specifically wound up. Is z. B. the winding of three additional layers, a terrace-shaped shoulder is formed, which projects beyond the sliver end resting on the coil surface. If the coils then touch during transport, these additional layers form a buffer that protects the end of the match. Even if the sliver end, for whatever reason, is detached somewhat from the surface of the coil, it will fall onto the terrace-shaped heel next and remain there in the niche.

It goes without saying that three, five, seven or any odd number of additional layers can be wound up as required. However, tests have shown that three additional layers are sufficient. This also minimizes the additional effort.

So that the sliver end actually comes to rest in the niche and also remains there, after the additional layers have been built up, a turn can preferably be made on the original coil surface with a smaller diameter that is not covered by additional layers. The sliver end is drawn into the niche formed by the additional layers and adheres better to the surface of the spool, even after it has been torn off.

The control for this additional process step is also extremely simple. The existing limit switch is used for the lower reversal point of the additional positions. In contrast, the upper limit switch is switched off after reaching the desired coil diameter and an intermediate limit switch is switched on. This intermediate limit switch determines the upper reversal point of the additional positions. It goes without saying that this intermediate limit switch can also be designed to be movable, so that this step can also run obliquely to the coil surface. However, this is not absolutely necessary, since the fuse has enough hold for three or five additional layers, even if it is placed one on top of the other. With this number of additional layers, the intermediate limit switch can remain stationary, so that the step is approximately at right angles to the coil surface.

The end position and the intermediate position do not need to be determined by mechanical limit switches. For example, the end and intermediate position limitation is also possible electronically. Here, in particular, electronic and electromechanical distance and angle meters are available, such as incremental encoders, linear encoders, potentiometers or the like. All known end position limiters are intended to be encompassed by the present inventive concept.

Finally, the idea of the invention also includes a coil which is produced by means of the method and the device according to the invention.

• Figur 1 eine schematische Seitenansicht eines Ausschnittes aus einer mit Flügeln ausgerüsteten Vorspinnmaschine (Flyer);
• Figur 2 eine schematische Seitenansicht des Ausschnittes gemäss Figur 1 in einer weiteren Gebrauchslage;
• Figur 3 eine vergrösserte Seitenansicht einer gerade fertig gewickelten Spule;
• Figur 4 eine Prinzipdarstellung einer Ausführungsvariante einer Steuerung der Bewegung einer Spule;
• Figur 5 eine Prinzipdarstellung einer weiteren Ausführungsvariante der Steuerung einer Spulenbewegung;
• Figur 6 eine Darstellung des Verlaufes der Steuerung der Spulenbewegung mit Endschaltern gemäß Figur 4;
• Figur 7 eine Darstellung des Steuerungsverlaufes der Spulenbewegung auf elektronischem Wege gemäß Figur 5.

Further advantages, features and details of the invention result from the following description of preferred exemplary embodiments and from the drawing; this shows in

• Figure 1 is a schematic side view of a section of a wing equipped roving machine (flyer);
• FIG. 2 shows a schematic side view of the detail according to FIG. 1 in a further position of use;
• FIG. 3 shows an enlarged side view of a coil which has just been wound;
• FIG. 4 shows a basic illustration of an embodiment variant of a control of the movement of a coil;
• FIG. 5 shows a basic illustration of a further embodiment variant for controlling a coil movement;
• FIG. 6 shows a representation of the course of the control of the coil movement with limit switches according to FIG. 4;
• FIG. 7 shows an illustration of the control process of the coil movement electronically according to FIG. 5.

According to Figure 1, a removable sleeve 2 is placed on a spindle 1. A stop ring 3 limits the insertion depth of the spindle 1 into the sleeve 2.

A sliver 4 is wound onto the sleeve 2, a sliver start 5 being able to be clamped between the sleeve 2 and the stop ring 3, as is described in CH-PS 626 663.

The fuse 4 is brought up through a hollow arm 6 of a wing 7, the hollow arm 6 serving as a counterweight a counter arm 8 is assigned. In this way, the wing 7 is in the form of a suspended fork, the hollow arm 6 and the counter arm 8 being connected to one another to form a rotating piece 9 which rotates in a bearing 10.

The rotating piece 9 is also hollow, so that the fuse 4 can be brought for example from a drafting system (not shown in more detail) and can be guided through a channel 11 in the hollow arm 6.

The fuse 4 emerges at the lower end of the hollow arm 6 and is then, preferably several times, wound around a press finger 12 which is fixed on the hollow arm 6. The press finger 12 is preferably connected to the hollow arm 6 by means of a rotating ring 13, so that the press finger 12 can be rotated around the hollow arm 6 in the direction of the coil 14. After a last rotation around a press finger arm 15, the fuse 4 leads from the outside through an opening 16 in a press finger disk 17 to the surface of the coil 14.

During the winding of the fuse 4, the coil 14 moves in the direction of the double arrow x, so that the fuse 4 is wound in layers. The first layer is located on the sleeve 2, while the following layers are then wound up over the layers already present. This winding stroke x is limited in each case by limit switches 18 and 19 shown in FIG. 3, which are arranged on a spindle 30 shown in FIG. 4 with opposing thread pitches 31 and 32, which each move the limit switches 18 and 19 by a predetermined amount to each other after the stroke reversal. This results in the conical configuration of the two end faces of the coil 14.

As soon as the coil 14 has reached its desired diameter, the spindle 1 and the wing 7 are stopped. The spindle 1 is now moved downwards together with the coil 14, as shown in FIG. 2, so that the fuse 4 is torn off, as described in the above-mentioned CH-PS 626 663. This creates a sliver end 20 on the spool 14, while a sliver bit 21 remains on the press finger 12 and is used for the next winding of the sliver 4 on a further sleeve 2.

The special features of the last method step are explained in more detail below with reference to FIGS. 3, 4 and 6. As mentioned above, the spool 14 is wound up by moving back and forth between the two limit switches 18 and 19 in the direction of the winding stroke x. The coil 14 is seated on a coil trough 33, which is connected to a chain 34, tape or the like. The latter is placed over a drive wheel 35 and connected at the end to a balance weight 36, a spring or the like. The drive wheel 35 is rotated by a drive (not shown in detail) and thus raises or lowers the coil trough 33. At the same time, it also raises and lowers a switching link 37 between the limit switches 18 and 19.

This back and forth movement takes place until the desired diameter d of the coil 14 is reached, the limit switches 18 and 19 moving towards each other preferably each time the stroke is reversed by the coil drive. The fuse 4 is now in the lower reversal point. Now, as with the known methods, a further layer is wound up. However, this does not happen up to the top reversal point, but only to an area between the top and lower reversal point, this area should be located approximately in the middle of the coil. Now, however, the rotation of the spindle 1 or of the blade 7 is not stopped, but a further preferably fixed limit switch 22 in turn causes the winding stroke x to be reversed, so that a second additional layer 24 is wound on an additional layer 23.

When the limit switch 19 is reached, the reversal of the winding stroke x is again effected, so that a third additional layer 25 is now wound. This in turn happens up to the limit switch 22. This process could be repeated several times, so that corresponding additional layers are created. Practice has shown that three additional layers are usually sufficient, but the plurality of additional layers should also be encompassed by the present inventive concept.

It is essential that the additional layers 23, 24 and 25 create a shoulder 26. If, for example, after the third additional layer 25, the spindle 1 and also the wing 7 are stopped and the spindle 1, as described in more detail above, is pulled down, the sliver end 20 is inserted into the area between the coil surface 27 and shoulder 26. However, this means that this coil end 20 lies in a protected area, so that it is secured against unwanted removal, particularly during transport.

If, for example, floating coils touch on a monorail between a flyer and a ring spinning device, the additional layers have a buffer function and the sliver end 20 is hidden on the terrace-shaped shoulder 26.

In a preferred exemplary embodiment, it is sufficient if the limit switch 22 is arranged in a fixed position, so that the additional layers are of identical design. Of course, however, it is also possible that the limit switch 22 as well as the limit switch 19 are adjusted relative to each other for each additional position 23, 24 and 25, so that the shoulder 26 also runs conically. It therefore never loses its protective function for the match 20, since it also forms a niche 28.

In FIG. 5 it is indicated that the coil movement can be controlled not only by mechanical limit switches but also electronically or electromechanically. This idea of the invention should of course also be included. For example, it is possible to couple an electronic travel meter 40 to the chain 34, a connecting piece 41 transmitting the movement of the chain 34 in the direction x to the electronic travel meter. Furthermore, an electronic or electromechanical protractor 42 can also be coupled to the drive wheel 35. Absolute encoders, incremental encoders, linear encoders, potentiometers, sliding resistors or the like can be considered as angle or displacement encoders. Here, all possible electronic and electromechanical displacement / angle meters are to be encompassed by the inventive idea.

Otherwise, the counterweight 36 is replaced by a spring 63a in FIG.

Figure 7 represents. control by an electronic or electromechanical displacement / angle meter 40 or 42. The method corresponds to this the one with mechanical limit switches and switching gates, so that a more detailed explanation is dispensed with.

Claims (11)

Method for producing a bobbin with a desired bobbin diameter by winding a fuse or the like onto a sleeve by means of a transfer element, the transfer element and the sleeve or coil being moved relative to one another within a winding stroke delimited by limit switches or the like,
characterized,
that after reaching the desired diameter, additional layers are wound onto the then existing coil surface, which form a terrace-shaped shoulder with a shortened winding stroke and a niche in the coil surface for inserting a sliver end. A method according to claim 1, characterized in that three or an odd plurality of additional layers are wound up. A method according to claim 1 or 2, characterized in that after the winding up of the additional layers, the transfer element and the coil are moved relative to one another, so that the fuse is introduced into the niche and remains with the formation of a sliver end remaining in the niche and a sliver bit remaining on the transfer element . Method according to Claim 1 or 2, characterized in that after the additional layers have been built up, at least one turn is produced on the original coil diameter before the fuse is torn off. Device for producing a bobbin with a desired bobbin diameter by winding a fuse or the like on a sleeve, in particular by means of a wing and a pressing finger in a roving device (flyer), the wing and sleeve or spool being movable relative to one another within a winding stroke limited by end position limiters are characterized in that a further intermediate end position for producing additional layers (23, 24, 25) and a shoulder (26) or a niche (28) is arranged between the end positions. Apparatus according to claim 5, characterized in that the intermediate end position is movable towards an end position after each reversal of the winding stroke (x). Apparatus according to claim 5 or 6, characterized in that mechanical limit switches (18, 19) and intermediate switches (22) for limiting the end positions and intermediate positions are associated with a switching link (37) coupled with the coil movement. Apparatus according to claim 7, characterized in that the limit switches (18, 19) are arranged on a spindle (30) which consists of two sections (31, 32) with opposite thread pitches. Apparatus according to claim 5 or 6, characterized in that the coil movement or corresponding drive elements (34, 35) are associated with electronic or electromechanical path and / or angle meters (40, 42) for determining the end positions or the intermediate position. Coil consisting of a sliver wound on a sleeve and a sliver end, which rests on a coil surface after reaching a desired coil diameter, characterized in that further additional layers (23, 24, 25) are wound on the coil surface (27), which are connected to the coil surface (27 ) form a shoulder (26) and a niche (28) for the match end (20). Coil according to claim 10, characterized in that the shoulder (26) extends perpendicularly or obliquely to the coil surface (27).

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