DE2063550A1 - Device to prevent balloon formation when unwinding a thread, in particular on unprotected looms - Google Patents

Description

The invention relates to a device for preventing the ikillonbildung, which usually occurs at the coil during the unwinding of the weft yarn at rifle and spoolless weaving looms, due to the centrifugal force and the high unwinding speed that from zero to ^r / \ x a J / Jaximum varies by many meters per second. It is known that when the weft thread is unwound from a stationary bobbin (at the speed mentioned, which is constantly variable between zero and many meters per second)

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BATH ORIGINAL

spontaneously forms a balloon, the diameter of which is a few centimeters larger than the diameter of the coil. this happens as a result of the high speed! generated centrifugal force as well as other circumstances. As a result of this bale formation, the bobbin "releases a larger amount of thread settled as little by little "from the Scimßeinlegera means of the loom is consumed in weaving, and it also causes a considerable slowdown in bathing on the Distance from the bobbin to the exit thread brake. Furthermore, the balloon formation can increase the risk of loops and loops Result in knots in the thread, depending on the properties of the thread and its, more or less strong twist. These loops and knots loosen difficult by itself under the effect of further promotion of the thread. You can therefore cause incorrect insertion of the thread in the warp shed and even in remain on the tissue, which affects its quality.

In order to eliminate these disadvantages, the device according to the invention comprises organs arranged around the coil, which to be grazed on the bobbin, so that they make light contact with the thread during unwinding Hold the bobbin. This avoids spontaneous balloon formation without any noticeable braking effect being exerted on the thread will.

829 / ms BADORIG.MAL

In practice, at least two fan blades can be provided as such organs, which are arranged around the coil independent of each other, pivotable on pins and in very light contact while the pad is being unwound are held with the surface of the coil. The pivot axes of the fan blades or other organs are each an egg-shaped line parallel to the conical or cylindrical side surface of the coil and can be adjustable ! Be held by carriers.

Besides the two mentioned fan flights, you can also at least one further fan blade must be provided, which is also arranged so that it rests against the coil. As the thread is unwound from the bobbin but the or each further fan blade is stopped, so that it is no longer the side face of the constantly in diameter decreasing coil follows. Plan thus avoids a mutual Obstruction of the fan blades and an unnecessary braking effect.

The wings can have a curved profile which extends on both sides of the respective pivot axis. They are then pressed in such a way that that part constantly touches the bobbin that is running in the direction of rotation of the Seen backwards the swivel axis is seen while the front

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the part lying on the pivot axis rests against the bobbin only at the beginning of unwinding and is reduced when it is reduced in diameter gradually removed from her.

The wings (or equivalent organs) can through Be loaded by gravity or possibly adjustable spring force about its pivot axis.

An embodiment of the invention is explained with reference to the drawings.

Fig. 1 and 2 show in section and very schematically Representation of a conical or cylindrical coil and the co-operating with it, preventing the ball formation Organs.

3, 4 and 5 show possible arrangements of the wings.

In Fig. 1 and 2 with 1 and 11, respectively, the conical or cylindrical core of a bobbin 3 or 13 denotes, of which the thread F by the train exerted by the loom over a fixed thread guide 5 is unwound to as weft thread to be fed into a shuttleless loom. With 7 carrier for the coil is designated, with 9 optionally adjustable Carrier for the cardan shafts 10 of two blades 12.

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With 14 small torsion springs are bezeich.net, which on the Waves 10 act and the force of which can be adjusted by means of regulating buttons 16.

According to one embodiment, the carriers 9 are orientable, to accommodate the inclination of the side face of the bobbin 13 along which the turns of the thread are Unwind F. The conicity of this side surface depends on the iron The type of spool and the type of material used.

The springs 14 are arranged so that they the hills 12 press against the bobbin 13, which in the following according to Pig. 2 is assumed to be cylindrical with a very light pressure, which is also preferred with the progressive reduction in diameter of the spool during unwinding of the thread is constantly decreasing.

As can be seen from Fig, 3, the wings 12 are only very light and grazing on the outer surface of the coil, bearing on opposite sides thereof. They are curved so that they enclose this side surface, and they are directed with the thread windings, which move in the direction of the arrows f1 from the fixed coil 13 transact. The contact.! 'Laugh of the wings can be at the

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.3550 L

Decrease in coil diameter up to diameter 13A, i.e. Ms to completely unwind the thread, decrease continuously.

According to the embodiment shown in Fig. 4 can except for the two opposite wings 12 third wing 112 may be provided, which is stopped, for example, by a stop 114 when he moves the position 112A has reached in order not to continue unwinding the Coil to obstruct the other two wings 12. It can a fourth wing can also be provided, which is arranged symmetrically to the third wing with respect to the coil axis. This arrangement increases the areas on the circumference of the coil which counteract the formation of the balloon.

For the same purpose, the wings can be provided with curved profiles that extend both in the unwinding direction the thread windings, which is indicated by the arrow f1, and extend in the opposite direction, as shown in FIG. Here the wings 212 point extensions 212A in the opposite direction to the arrow f1 on. These extensions are effective initially, but move away from the circumference of the coil as the Diameter decreases by unwinding the thread turns.

The wings correspond to the outer profile of the coils

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206355

profiled, with whom they should cooperate, also "regarding the inclination of the pivot axes 10 of the wings. The thickness of the wings is very small and they are advantageous flexible.

With this arrangement, it is possible, without slowing down the unwinding of the thread, to reduce bale formation or to prevent entirely. At the same time, there is still the option of connecting head and end between several on the loom provided bobbins that are to be unwound one after the other. It is not impossible that at least one of the wings can be removed for changing a spool.

Depending on the position of the wings and the coil, it is also possible to provide for the wings to be pressed only by gravity, or counterweights can be used to hold the wings to bring them into equilibrium with respect to their pivot axes.

The embodiment described and shown is only to be understood as a non-restrictive example and changes and configurations are within the scope of the invention.

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Claims (8)

2053550 claims 1.) Device to avoid ball formation when Unwinding the weft thread on shuttleless and bobbin-less looms, characterized in that around the coil (1, 11) organs (12, 112, 212) are arranged which are pressed against the coil with a light grazing contact are such that they catch the weft during unwinding keep it in light contact with the bobbin and thereby prevent bale formation without any noticeable braking effect. . 2. Apparatus according to claim 1, characterized in that g e that at least two wings (12) are arranged around the coil, which are independent of one another are pivotable around pins and are pressed against the bobbin with light contact while the thread is being unwound. 3. Apparatus according to claim 1 or 2, characterized in that the organs or mounds be rotated by weak springs about their pivot axes to rest on the spool. 109829/1 U8 4. Device according to one of claims 1 to 3, characterized in that the pivot axes of the organs or wings (12) parallel to a surface line the conical or cylindrical coil are arranged and optionally orientable embossers (9) are held. 5. Device according to one of claims 1 to 4, characterized in that at least three hills (12, 112) are arranged around the spool and that at least as the unwinding of the spool progresses one of the wings can be stopped so that it fits the circumferential surface of the diameter-reducing coil no longer follows. 6. Device according to one of claims 1 to 5, characterized in that the "lie!" (212) have a curved profile which extends to both sides of their pivot axis, and that the wings can be pressed against the bobbin in such a way that the rear part with respect to the unwinding direction (f1) of the thread is constantly on the spool and the front part is closed Beginning of unwinding rests against the spool and gradually moves away from it at its Uurohraesuerabnahrae. - 2 - 109829/1 U8 ORIGINAL 7. Device according to one of claims 1 to 5, thereby g e k θηη ζ e i e h η e t that the organs or Pliigel (12, 112, 212) by gravity around their Axes are loaded to rest on the coil. 8. Device according to one of claims 1 to 5, characterized in that the wings or Organs by optionally adjustable springs (H) System on the coil are loaded. 109829 / IUa 91 I 9 SJ ΘΘΤ. 'ff '!! Ιιι., Ίμΐί, ϋΐίϋΙΐΙίίΙΐί illul! . ".;" '! »... j ι