CZ2016746A3 - A method of finding the end of the yarn on the bobbin of a textile machine producing or processing yarn and a device for its implementation - Google Patents

Abstract

In the method of searching for the yarn end (1) on the bobbin (2) of the yarn producing or processing machine, the suction nozzle (11) approaches the bobbin (2) and the yarn end (1) is sucked from the rotating bobbin. A pressing line (10) between the driving surface (5) of the movable means (6) and the strip (8) is brought closer to the winding surface (4) on the spool (2) and the yarn end (1) is rotated by turning the spool (2) and, by moving the movable means (6) in the opposite direction, engages in the pressing line (10), whereupon the retained end of the yarn (1) is pulled from the bobbin (2) by the further movement of the movable means (6) and clamped to the mouth (12) of the suction nozzle (11) into which the suction nozzle (11) is then sucked into the defined position in the suction nozzle (11) for further manipulation by a suction air flow in the direction from the movable means (6). The yarn end locating device on the spool comprises a suction nozzle (11) assignable to a coil (3) on the coil (2) and connected to a vacuum source. The device is stored on the positioning means. The suction nozzle (11) is associated with the entrainment surface (5) of the movable means (6) with its mouth (12), and in the direction (S1) of the entrainment means (5) in the search for the yarn (1) is the suction nozzle ( 11) a yarn pressing line (10) is formed (1).

Description

Method for locating a yarn end on a bobbin of a textile machine producing or processing yarn and a device for making it

Technical field

BACKGROUND OF THE INVENTION The present invention relates to a method of locating the yarn end on a yarn of a textile machine producing or processing yarn, in particular after the yarn winding has been interrupted, the suction nozzle approaching the yarn after the yarn break.

The invention also relates to a yarn end finding device on a bobbin of a textile machine producing or processing yarn, comprising a suction nozzle attributable to a bobbin and connected to a vacuum source, the device being mounted on a positioning means.

BACKGROUND OF THE INVENTION

During yarn production or processing, the yarn is wound on a bobbin for further processing. However, due to various circumstances, irregularities, etc., yarn breakage occurs when the yarn is wound on the bobbin. After the yarn break, the yarn end is wound on a spool and for other operations on the machine, such as resuming the yarn winding, the yarn end on the spool needs to be retrieved, gripped and introduced into the appropriate working machine of the textile machine. operation to resume yarn winding.

In principle, this can be done either manually or automatically, or also in certain semi-automatic modes.

In the field of automatic yarn end detection on a spool, a suction nozzle search has long proved to be successful, the suction mouth of which approaches the bobbin with the desired yarn end and a strong vacuum is introduced into the suction nozzle. Upon subsequent rotation of the bobbin, the end of the yarn is sucked from the bobbin surface, thereby searching for the yarn on the bobbin, and then by moving the suction nozzle while the bobbin is rotating, the bobbin so sought is moved to the desired position on the machine.

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However, there is a problem with some types of bobbins in which the automated detection of the yarn end on the bobbin due to a high vacuum is unsuccessful or has little success. There may be several reasons, but one of the main factors is that the yarn break creates a very short loose yarn end and possibly even partially enters the yarn end or yarn end into the package so that even a strong vacuum from the known suction nozzle is not able to successfully locate such end or end portion of the yarn on the bobbin and take it to a defined state or position. A further disadvantage of the known high vacuum solutions is their high energy consumption to produce this high vacuum.

DE 10 2016 203 066 discloses a yarn end retrieval device on a winding reel in which an excitation surface of synthetic fiber fabric is brought into contact with the winding in order to drive the free end of the yarn onto the winding, whereupon For example, the loose yarn winding end is sucked into the suction slot associated with the winding circumference on the bobbin by further rotation of the spool, thereby locating this yarn end for further handling. The disadvantage of this arrangement is the relatively low search reliability for stronger windings, such as are generated, for example, on ring machines, and also the risk of damage to the winding by contact with the excitation surface. Another drawback is the relatively high need for suction air to suck the excited yarn end from the spool surface into the suction nozzle.

It is an object of the present invention to overcome or at least reduce the disadvantages of the prior art, in particular to increase the success rate of the automated yarn end detection on the bobbin.

SUMMARY OF THE INVENTION

The object of the invention is achieved by a method of locating the yarn end on a bobbin of a textile machine, characterized in that a pressing line is approached to the surface of the winding on the bobbin between the driving surface of the movable means and the bar. the gripping end of the yarn is then withdrawn from the spool by further movement of the movable means and clogged to the suction mouth

a nozzle into which it is subsequently sucked into a defined position in the suction nozzle for further handling by a stream of intake air in the direction away from the movable means.

The essence of the yarn end detecting device on a bobbin of a textile machine is that the suction nozzle is associated with its orifice surface of the movable means, and a yarn press line is formed upstream of the suction nozzle in the direction of the yarn search.

The advantage of the invention is to significantly increase the reliability of yarn end lookup on the bobbin by using a significantly lower vacuum than conventional prior art solutions, even in bobbins where the yarn end is not only wound on the bobbin but also plunged into the winding so suction by high vacuum by existing techniques.

Clarification of drawings

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a general principle of the invention with an embodiment of an endless moving belt without a front suction nozzle on the back of the mobile device. 3 shows the general principle of the invention with the embodiment of the movable means in the form of a rotatable cylindrical surface.

DETAILED DESCRIPTION OF THE INVENTION

The method of locating the yarn end on a textile machine spool and the apparatus for making it will be described, by way of example, on a spinning machine producing a yarn 1 which is wound on a rotating bobbin 2 which is rotatably mounted in the machine structure. The wound yarn 1 forms a spool 3 with a surface 4 on the spool 2. The method and the device can also be used on a textile machine processing the yarn 1.

The yarn detecting device 1 on the bobbin 2 comprises a movable means 6 with a driving surface 5 on the outer surface of the movable means 6.

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The movable means 6 is formed, for example, by a movable endless belt or surface of a rotating roller, etc., as will be described in more detail below.

The driving surface 5 is movable in the direction S1 against the direction of movement S2 of the surface 4 of the winding 3 on the bobbin 2 when searching for the end of the yarn 1 when searching for the yarn end 1.

In the embodiment of Figs. 1 and 2, the movable means 6 is formed as an endless movable belt wrapped around at least two guide rollers 16, at least one of which is connected to a rotation drive. In an exemplary embodiment (not shown), the pulley system 16 is provided with a tensioning device to provide the necessary tension of the movable means 6.

In the exemplary embodiment of FIG. 3, the movable means 6 is designed as a cylindrical surface, i. a cylinder housing that is rotatably mounted within the frame of the yarn end finding device 1 and coupled to the drive of its rotation.

According to one preferred embodiment, the entrainment surface 5 has a surface structure improving the adhesion of the sought yarn 1 to the entrainment surface 5, eg when the movable means 6 is formed by an endless movable leather belt, it is advantageous if the entrainment surface 5 is treated by grinding or other suitable subdivision technology , scalp) skin surface. For example, when forming the movable means 6 as a web of synthetic material, the entrainment surface 5 is either also wrinkled by suitable technology or, on the contrary, is smooth and the adhesion between the entrainment surface 5 and the desired end of yarn 1 is determined by the material composition of the movable device 6 the material composition of the yarn 1, the hairiness of the yarn 1, etc. However, the adhesion of the sought-after yarn 1 to the entrainment surface 5 must not be too great for the sought-after yarn 1 to be successfully and relatively easily transferred by other means of the device according to the invention in further steps of the method of the invention.

In the direction S1 of the movement of the movable means 6 when searching for the end of the yarn 1 on the bobbin 2, in the region of approaching the movable means 6 to the surface 4 of the winding 3 on the bobbin 2 is assigned a bar 8. the end of the yarn 1 on the bobbin 2, the leading edge 9 of the bar 8 being situated parallel to the width. Between the leading edge 9 of the bar 8 and the driving surface 5 of the movable device 6, a pressing line 10 is formed to engage the sought end of the yarn 1 and squeeze it between the bar 8 and the bar. a driving surface 5 as the end of the yarn 1 passes towards the suction nozzle 11, as will be described in more detail below.

The width of the driving surface 5 of the movable means 6, i.e. the dimension in the plane of the driving surface 5 in a direction perpendicular to the direction S1 of the movement of the movable means 6, determines the width of the yarn end search zone 1 on the bobbin 2. the dimension of the search zone in the direction of rotation of the bobbin 2 is given by the mutual arrangement of the surface 4 of the winding 3 on the bobbin 2 and the position of the pressing line 10 between the leading edge 9 of the strip 8 described below and the driving surface 5.

The aforementioned suction nozzle 11 is assigned by its mouth 12 a space 13 between the trailing edge 14 of the bar 8 and the driving surface 5 of the mobile device 6, or it is located between the bar 8 and the driving surface 5 of the mobile device

6. In the illustrated embodiment, the bar 8 is situated obliquely to the direction S1 of the driving surface 5. This measure improves the action of a second stream of intake air from the suction nozzle 11 on the desired yarn 1 in the space between the bar 8 and the driving surface 5.

The suction nozzle 11 is associated with a yarn presence sensor (not shown), which indicates that the end of the yarn 1 is sucked into the suction nozzle 11, which is also a signal for successfully finding the yarn end 7 on the bobbin 2. spool 2, eg for re-production or processing of yarn 1.

In a preferred embodiment, the strip 8 on its side adjacent to the driving surface 5 is provided with a counter-rotating locking edge 15 parallel to the width of the driving surface 5 in the width direction of the movable means 6, this locking edge 15 being directed against the S1 movement direction of the driving surface 5 on the bobbin 2. The locking edge 15 limits the possible retraction of the searched yarn 1 from the space between the bar 8 and the driving surface 5 and increases the success of transferring the searched end of the yarn 1 from the bobbin 2 to the suction nozzle 11 as described below. . In the illustrated embodiment, the locking edge 15 is formed by bending the front of the bar 8 in the direction S1 of the driving motion.

The surface 5 when searching for the yarn 1 on the bobbin 2, so that, depending on the angle of its bending, it possibly extends the pressing line 10 to a greater length of the driving surface 5 than the pressing line 10 would be determined only by the leading edge 9 of the bar 8 and the driving surface 5. In the exemplary embodiment, the locking edge 15 is formed in another suitable manner and / or is situated on another part of the strip 8, e.g. in its central part, etc.

The above-described yarn end finding device 1 on the spool 2 is mounted on a handling means (not shown) to bring the yarn end finding device 1 on the spool 2 to the required position and distance of the driving surface 5 and the pressing line 10 to the surface 4 For example, the handling means is part of an operating device which is displaceably arranged along a series of workstations of the spinning machine, wherein each workstation includes, among other means, a yarn winding device 1 per spool 2. Preferably, the suction nozzle 11 is individually adjustable between position. in which its mouth 12 is associated with the driving surface 5 of the movable means 6 and in a position in which the end of the yarn 7 to be retrieved and caught in the suction nozzle 11 can be passed to the other working means of the textile machine eg to resume yarn production 1.

The invention is based on the pressing line 10 between the driving surface 5 of the mobile device 6 and the bar 8, and at the same time the driving surface 5 of the mobile device 6 as such approaches the surface 4 of the winding 3 on the spool 2. the driving surface 5 during retrieval of the yarn end 1 on the bobbin 2 towards S1 opposite the direction of rotation S2 of the bobbin 2 when retrieving the end of the yarn 1 on the bobbin 2. Thus, the bobbin 2 rotates in the direction S2. When searching for the end of the yarn 1, the entrainment surface 5 is preferably in close proximity to the surface 4 of the winding 3 on the spool 2, it does not need to touch it in order to avoid damage to the winding 3. since the closer the pressing line 10 is to the surface 4 of the winding 3, the shorter end of the yarn 1 on the bobbin 2 can be successfully retrieved and caught, especially on ring spinning machines.

By rotating the bobbin 2 and counter-directionally moving the driving surface 5, the end of the yarn 1 is caught in the pressing line 10 and by further moving the movable yarn.

The means 6 is withdrawn from the spool 2 while still passing through the pressing line 10 until the end of the yarn is conveyed to the mouth 12 of the suction nozzle 11 into which se nasaje. When conveying the sought end of the yarn 1 to the suction nozzle 11, slippages may also occur between the sought end of the yarn 1 and the entrainment surface 5 in the press line 10, because the circumferential speed of the entrainment surface 5 and the surface 4, or there is a temporary increase in tension in the entrapped end portion of the yarn 1 and, as a result, a reaction force is generated against the direction of movement of the entrainment surface 5 and this reaction force is capable of retarding the entrapped end portion. 1 is prevented further by the suction air flow from the suction nozzle 11, possibly also by a certain adhesion of the yarn 1 to the entrainment surface 5 and, last but not least, also in the opposite direction a locking edge 15 on the bar 8, in particular p even pulling the desired end of the yarn 1 back to the bobbin 2 due to the resistance against loosening the end portion of the yarn 1 from the bobbin 2 by immersing the yarn into the winding, causing a temporary increase in tension against the direction of movement of the driving surface 5 and this reaction force is able in some cases to pull the captured end portion of the yarn 1 from the pressing line 10 up to the bobbin 2. The suction of the yarn end 1 into the suction nozzle 11 is subsequently indicated by said yarn presence sensor 1 in the suction nozzle. the suction nozzle 11 is then transferred to the downstream winding or rewinding authorities. resumption of yarn production.

According to the embodiment of Figs. 2 and 3, to improve the retrieval efficiency of the yarn end 1 on the bobbin 2, the entrainment surface 5 is air permeable and its rear side is assigned a front suction nozzle 7 in the region Z of the entrainment surface 5 to the web 4 connected to a vacuum source, which generates a first stream of intake air. The front suction nozzle 7 is assigned by its suction inlet to the rear of the movable means 6. By the rear of the movable means 6 is meant the side of the movable means 6 opposite to that approaching the surface 4 of the winding 3 on the spool 2. 2 or the inner surface of the cylindrical surface when forming the movable means 6 as the roller of FIG. 3, etc. The permeability of the entrainment surface 5 for air is achieved, for example, by forming the movable means 6, air permeable material, e.g., various textiles, permeable plastics, and other suitable air permeable materials. Optionally, the air permeability of the movable means 6 is achieved by perforating the movable means 6 through a suitable system of through holes of suitable shape, size and surface distribution. In such a case, the movable means 6 may also be formed from other air impermeable materials such as leather, impermeable plastics and other synthetic materials, metals, etc. It is understood that the permeability of the movable air means 6 can be addressed in various ways and with using various materials of the mobile device 6.

The method of locating the end of the yarn 1 on the bobbin 2 modified by the addition of the front suction nozzle 7 is characterized in that in the described approach position of the driving surface 5 and the pressing line 10 to the bobbin 2 the first sucked air stream from the front the suction nozzle 7 over the driving surface 5. By rotating the bobbin 2, moving the driving means 5 and the first stream of intake air, the end of the yarn 1 is removed from the surface 4 of the winding 3 on the bobbin 2 and caught by the pressing line 10. by pressing line 10 to the mouth 12 of the rear suction nozzle 11, which in this embodiment is the rear suction nozzle 11, into the mouth 12 of which is sucked by a second stream of suction air. Possible pulling of the sought end of the yarn 1 back to the bobbin 2, eg due to the insertion of a part of the length of the yarn 7 into the winding 3 on the bobbin 2 is prevented by the pressing line 10 alone. The suction of the yarn end 1 into the rear suction nozzle 11 is then indicated by said yarn presence sensor 1 in the rear suction nozzle 11. From the rear suction nozzle 11, the sought end of the yarn 1 is Subsequently, it shall forward to the related authorities for the rewinding of the winding, respectively. resumption of yarn production.

Claims (10)

Method for locating the yarn end (1) on a spool (2) of a textile machine producing or processing yarn, in particular after the winding is interrupted due to the yarn breakage (1), when the suction nozzle (11) approaches the bobbin (2) The end of the yarn (1) is sucked from the rotating spool, characterized in that a pressing line (10) between the driving surface (5) of the movable means (6) approaches the surface (4) of the winding (3) on the spool (2). and a bar (8), whereupon the yarn end (1) is rotated by the bobbin (2) and the backward movement of the movable means (6) into the press line (10), whereupon the captured yarn end (1) is withdrawn by further movement of the movable means (6). from the spool (2) and is introduced to the mouth (12) of the suction nozzle (11) into which it is subsequently sucked into a defined position in the suction nozzle (11) for further handling by a stream of suction air in the direction away from the movable means (6). Method according to claim 1, characterized in that in the direction of movement (S1) of the movable means (6) upstream of the pressing line (10), the winding (3) on the spool (2) is subjected to a forward stream of intake air which is sucked in a suction nozzle (7) via a movable means (6). Method according to claim 1 or 2, characterized in that the movement of the movable means (6) blocks the return movement of the captured end of the yarn (1) against the direction of movement (S1) of the driving surface (5) of the movable means (6). A device for detecting a yarn end on a yarn of a textile machine producing or processing yarn, comprising a suction nozzle (11) attributable to a winding (3) on a bobbin (2) and connected to a vacuum source, the device being mounted on a positioning means that the suction nozzle (11) is associated with its orifice (12) to the driving surface (5) of the movable means (6), wherein in the direction (S1) of the movement of the driving means (5) at · · ·; '_; hS4121 The yarn search (1) is provided with a yarn compression line (10) in front of the mouth (12) of the suction nozzle (11). Device according to claim 4, characterized in that a suction zone (Z) of the front suction nozzle (Z) is formed in front of the pressing line (10) of the yarn (1) in the direction of movement (S1) of the driving means (5). 7), which is associated with its mouth at the back of the movable means (6) and which is connected to a source of vacuum, the movable means (6) being permeable to the intake air. Device according to claim 4 or 5, characterized in that the movable means (6) is formed by a movable endless belt. Device according to claim 4 or 5, characterized in that the movable means (6) is formed by a rotatable cylinder housing. Device according to any one of claims 4 to 7, characterized in that the strip (8) is provided with a counter-directional locking edge (15). Device according to claim 8, characterized in that the upstream locking edge (15) is formed by a bent front part of the strip (8). Device according to any one of claims 4 to 9, characterized in that the movable means (6) is made of a fabric or leather or a synthetic material.