DE102013021972A1

DE102013021972A1 - Production of a conical cheese from S-twisted yarn

Info

Publication number: DE102013021972A1
Application number: DE102013021972.8A
Authority: DE
Inventors: Ansgar Paschen
Original assignee: Saurer Germany GmbH and Co KG
Current assignee: Saurer Spinning Solutions GmbH and Co KG
Priority date: 2013-12-20
Filing date: 2013-12-20
Publication date: 2015-06-25
Also published as: JP6452435B2; CN104724542B; CN104724542A; IN2014MU03853A; JP2015120600A

Abstract

The present invention relates to a method for producing conical cheeses (5) with S-twisted yarn. According to the S-twisted yarn is wound on a sleeve (18) that forms a p-winding and the symmetry ratio, that is, the ratio of the laying speed between, as viewed from the operating side, left and right front side of the cheese (5 ) is increased during the coil travel. The invention also relates to the cross-wound bobbin (5) produced by the method and to the winding device (4) for carrying out the method.

Description

The present invention relates to a method for producing a conical cheese from S-twisted yarn. The invention further relates to the cheese and a winding device for producing the cheese.
The DE 10 2008 015 907 A1 discloses a workstation of a winder with a winding device for producing conical cheeses. At the work stations of the winder spin cops, the product of a ring spinning machine, rewound to large-volume cheeses. Such cheeses are often formed as conical cheeses. That is, the cross-wound bobbin has a smaller diameter toward one end face and a larger diameter toward the other end face. During further processing cheeses are drawn off over the smaller diameter. This reduces the friction of the drawn yarn on the package of the cross-wound bobbin.
The winding device has a creel for holding the cross-wound bobbin or the sleeve, a laying device designed as a single motor driven finger thread guide for laying the thread on the cross-wound bobbin and a device designed to drive the cross-wound bobbin. Due to the different circumference at the two end faces of a conical cheese, more yarn is wound on the side with the larger diameter than on the side with the smaller diameter. In order to ensure proper threading, it is necessary for the laying device to have a lower speed on the side with the larger diameter than on the side with the smaller diameter. The ratio of the laying speed between the viewed from the operating side, left and right end side of the cheese is referred to as Konizitätsfaktor or symmetry ratio.
Spun yarns of single fibers may be either Z-twisted or S-twisted yarn. With a Z-twisted yarn, the single fibers in the yarn are in the direction of the slash of the letter Z when the yarn is held vertically. An S-twisted yarn has an opposite twist. The individual fibers lie with the thread held vertically in the direction of the slash of the letter S. Yarns are predominantly Z-spun, so that with Z-twisted yarns an explicit statement of the rotation is generally dispensed with.
Winding devices are usually designed so that the end face of the cheese with the smaller diameter on the viewed from the operating side, left side of the winding device and corresponding to the end face of the cheeses with the larger diameter, viewed from the operating side, right side of the winding device is. According to the definition explained above, the symmetry ratio with which the cross-wound bobbin is wound is larger than one. In this arrangement, a conical cheese is formed with a so-called p-winding. That is, when pulling the thread over the smaller diameter of the cheese, the thread held tangentially to the winding points in the direction of the smaller diameter of the cheese the course of the letter p. For a Z-twisted yarn, which is wound in p-winding on a cross-wound bobbin, results in an optimum take-off behavior. Before the thread lifts off the cross-wound surface when it is pulled off, it initially lies in an arc shape on the cross-wound package circumference. When pulling the thread then rolls in the direction of rotation and receives a further rotation, which causes a twisting of the thread.
When an S-twisted yarn is withdrawn from a cross-wound bobbin with the p-wrap, the twist given by the rolling counteracts the twist of the yarn so that the thread is wound up. As a result, reinforced fibers are from the thread. The protruding fibers cause individual threads can get caught with each other and this can lead to difficulties in the deduction of the cheese. In addition, the S-twist of the yarn, when pulled from a P-wrap, causes the thread ballon to be screwed in, thereby still promoting the entanglement of threads.
In order to be able to extract an S-twisted yarn optimally from a cross-wound bobbin, the cross-wound bobbin can be designed as a q-winding. When the thread is drawn off over the small diameter of the cross-wound bobbin, the thread held tangentially to the winding points in the direction of the small diameter of the cross-wound bobbin the course of the letter q. In order to produce a conical cross-wound bobbin with q-winding, the cross-wound bobbin must be wound up in such a way that the smaller diameter is formed on the left-hand side as viewed from the operating side, on the left-hand side and on the right-hand side. That is, the symmetry ratio is less than one. A conical sleeve must therefore be inserted opposite to the winding of a p-winding opposite. This requires a conversion of the creel.
The DE 10 2008 015 908 A1 discloses a winding device for winding a cross-wound bobbin on a cylindrical sleeve. In order to produce a conical cross-wound bobbin, in the Z-yarn during the bobbin travel, the symmetry ratio is increased from the value 1 during the bobbin travel. This creates a cheese with a p-winding. For S-yarn the symmetry ratio is lowered starting from the value 1 during the coil travel. This results in a conical cross-wound bobbin with q-winding. Due to the cylindrical sleeve, although the sleeve receptacle can be used unchanged for Z and S yarn, but it is a special design of the creel required. When winding a cross-wound bobbin with q-winding an inclination of the creel to the horizontal is required, which goes beyond the usual level for winding devices for winding p-turns.
From the DE 10 2008 015 907 A1 It is also known to start winding a p-winding of Z-twisted yarn onto a conical sleeve having a symmetry ratio greater than that required for the desired taper of the cross-wound bobbin, and then lower the symmetry ratio to the desired value during the bobbin travel. By this procedure is to be achieved that at the beginning of the spool trip more yarn is wound on the side with the larger diameter, thereby shifting the driven diameter on this page. As a result, fluctuations in the rotational speed and thus the following error are reduced when laying in the reversal points. A statement for winding 5-yarn makes that DE 10 2008 015 907 A1 Not.
It is therefore the object of the present invention to provide a method for winding conical cheeses with S-twisted yarn, which have a good peel behavior and can be made without major changes to common winding devices for Z-yarn.
The object is achieved by a method in which the S-twisted yarn is wound on a sleeve so that a p-winding is formed and wherein the symmetry ratio, that is, the ratio of the laying speed between, as viewed from the operating side, left and right end side of the cheese, while the coil travel is increased.
The invention is based essentially on two findings that are combined with each other. On the one hand, with small coil diameters, the pull-off properties of S-twisted yarn are also acceptable for a p-winding, and on the other hand, the entanglement of yarns during removal can be largely prevented by winding with as large a symmetry ratio as possible. However, a large symmetry ratio or a strong taper of the cheese limits the maximum diameter. However, small package diameters reduce the productivity of yarn processing and are therefore undesirable. Therefore, according to the present invention, the cheese is wound at the beginning of the coil travel with a smaller symmetry factor. As the diameter increases, the symmetry ratio is increased. In this way, a cheese with a sufficient diameter and good triggering properties.
Since a cross-wound bobbin is wound with p-winding, common bobbin frames for Z-yarn packages can be used. Only the control device of a conventional winding device has to be adapted so that a symmetry ratio which increases over the coil travel can be predetermined. This should usually be possible through software customization.
Advantageously, the S-twisted yarn is wound onto a conical sleeve. This can already be started with a symmetry ratio greater than one corresponding to the conicity of the sleeve, so that the end of the coil travel a larger symmetry factor is possible, as in a cylindrical coil. As a result, the trigger properties are further improved.
The symmetry ratio can be increased exponentially, linearly or abruptly.
The invention also relates to a conical cheese, which is produced by the method according to the invention. Such a conical cross-wound bobbin comprises a sleeve and a yarn package of S-twisted yarn, wherein the yarn package is formed as a p-winding and the conicity of the lower yarn layers is less than the conicity of the upper yarn layers. Preferably, the sleeve of the conical cheese according to the invention is designed as a conical sleeve.
The invention further relates to a winding device for producing a conical, designed as a p-coil cheese, comprising a coil frame for holding a conical sleeve, a single motor driven laying device for laying a thread on the cheese and a device for driving the cheese, wherein a control device for Actuation of the laying device is provided, which is designed so that the ratio of symmetry, that is, the ratio of the laying speeds between, as viewed from the operating side, left and right front side of the cheese, during the bobbin travel can be increased.
The winding device may be associated with input means via which an operator can specify an increasing course of the symmetry ratio during the coil travel. The course can be stored in the storage means associated with the winding device. The control device is designed such that the predetermined course in Depending on the cross-wound coil diameter is set automatically.
The invention will be explained in more detail with reference to an embodiment shown in the drawings.
Show it
1 in side view schematically a job of a cheese-producing textile machine;
2 a front perspective view of the winding device according to 1 ;
3 a linear course of the symmetry ratio;
4 an exponential curve of the symmetry ratio;
5 a sudden course of the symmetry ratio.
In 1 is a side view schematically a job 2 a cheese-producing textile machine, in the embodiment, a so-called cross-winding machine 1 represented. On the jobs 2 Such cheese winder 1 are produced on ring spinning machines, relatively little thread material having spinning cops 3 to large-volume cheeses 5 rewound. The cheeses 5 be after their completion by means of a non-illustrated, automatically operating service unit, preferably a cheese changer, on a machine-length cheese package transport device 7 passed and transported to a machine end side arranged Spulenverladestation or the like.
Such spoolers 1 As a rule, they also have a logistics device in the form of a cop and tube transport system 6 on. In this cop and sleeve transport system 6 run the spinning cops 3 or empty tubes on transport plates 11 around. From the cop and sleeve transport system 6 are in the 1 only the Kopszuführstrecke 24 , the reversibly drivable storage section 25 , one of the winding units 2 leading transverse transport routes 26 as well as the sleeve return path 27 shown.
Every job 2 of the cheese winder 1 has a control device, a so-called winding station computer 28 on, among other things, a bus connection 29 to a central control unit 30 of the cheese winder 1 as well as via control lines 15 . 35 to the individual drives 14 . 33 the winding device 4 connected.
The winding device 4 has, among other things, a creel 8th who, as in 1 indicated, at least about a pivot axis 12 parallel to the axis of rotation of the cheese 5 runs, is movably mounted. The coil frame 8th can also, which is basically known and therefore not shown for reasons of clarity, to another pivot axis orthogonal to the pivot axis 12 runs, limited rotatably mounted. In the illustrated embodiment, the coil frame 8th designed so that a conical sleeve for winding conical cheeses can accommodate.
As in 1 further indicated, the lies in the coil frame 8th freely rotatable mounted cross-wound bobbin 5 during the winding operation with its surface on a bobbin drive roller 9 on that by an electric motor 33 single motor is applied. The electric motor 33 is via the control line 35 to the workstation computer 28 connected.
Furthermore, to the traversing of a thread 16 during the winding process a laying device 10 intended. Such, in the 1 only schematically indicated laying device 10 preferably has a finger thread guide 13 on, by, by a reversible single drive 14 applied to the cheese 5 running thread 16 at high speed between the end faces of the cheese 5 traversed. The thread guide drive 14 stands over the control line 15 also with the workstation computer 28 in connection.
Such jobs 2 As a rule, they also have a thread connecting device 42 , preferably a pneumatic splicing device, a gripper tube 43 for handling the lower thread and a suction nozzle 17 , with the one on the cheese 5 accumulated upper thread added and in the thread connecting device 42 can be inserted.
The 2 shows the winding device 4 a job 2 in perspective front view. That is, the 2 shows the winding device 4 , viewed from the operator side. As indicated, each of these jobs points 2 one with an input device 32 equipped Spulstellengehäuse 31 on, among other things, the winding station calculator 28 receives. At the winding station housing 31 is also the winding device 4 essentially set from the creel 8th for holding the conical sleeve 18 a cheese 5 , the coil drive roller 9 for rotating a conical sleeve 18 or the cheese forming thereon 5 and the laying device 10 for traversing the cheese 5 running thread 16 consists.
The laying device 10 has a finger thread guide 13 on, its single drive 14 over the control line 15 with the winding station computer 28 connected is. The finger thread guide 13 is about the winding station computer 28 defined controllable, so that among other things the thread laying speed is precisely adjustable.
The bobbin drive roller 9 also has a single drive 33 , in turn, via the control line 35 with the winding station computer 28 communicates to the single drive 33 to drive defined. The coil frame 8th that is at least one pivot axis 12 has limited rotatably mounted, has two coil frame arms 20 . 21 on, in turn, each equipped with a rotatably mounted sleeve receiving plate.
The winding of the S-twisted thread 16 on the conical sleeve 18 takes into account the geometry of the sleeve 18 To ensure that there is a uniform coil structure of the conical cheese to be produced 5 comes. This is done depending on the taper of the sleeve 18 calculated a speed ratio, which is the ratio of the thread laying speeds at the end faces of the cheese 5 reproduces and at the winding station computer 28 or at the central control unit 30 is preset. This velocity ratio, referred to below as the symmetry factor S, influences the amount of the conical sleeve 18 wound thread 16 between the two end faces of the sleeve 18 and thus the coil structure of the cheese 5 , The conical sleeve 18 is for winding a cross-wound bobbin 5 inserted with p-winding. That is, the smaller diameter side is on the left and the larger diameter side is on the right. The thread laying speed on the left side is set larger than on the right side. The symmetry ratio is defined as the ratio of the laying speed between, viewed from the operating side, left and right end face of the cheese. This results in the present case when winding the cross-wound bobbin on a conical sleeve, a starting value of the symmetry ratio S, which is greater than one. The thread laying speed changes depending on the predetermined symmetry ratio S within a laying stroke of the finger thread guide 13 from one side to the other of the sleeve 18 , so that the wound-up amount of thread on the sleeve 18 wound thread 16 , based on the width of the sleeve 18 , changed accordingly. The adaptation of the thread laying speed within the stroke over the coil width serves to achieve a uniform structure of the bobbin.
The 3 to 5 show possible curves of the symmetry ratio S as a function of the diameter D of the cheese 5 , All processes shown relate to the winding of a conical cheese 5 with p-winding on a conical sleeve 18 , The starting value of the symmetry ratio S is already greater than one in all figures. When winding the S-yarn in p-winding onto a cylindrical sleeve, the starting value of the symmetry ratio S is usefully equal to 1. In any case, as the diameter D increases, the symmetry ratio S is increased. This decreases the conicity of the cheese 5 or the individual yarn layers of the cheese on the coil travel accordingly. The magnification of the symmetry ratio S can be continuous, as in the 3 and 4 ; or jump, as in 5 , The adjustment can be linear, as in 3 , or exponentially, as in 4 , respectively. In 4 the symmetry ratio S is only slightly increased with a small diameter D and correspondingly stronger with a larger diameter. That is, there is here a progressive adjustment of the symmetry ratio S as a function of the cheese diameter D.
The curves of the symmetry ratio can be used on the winding station computer 28 or at the central control unit 30 be specified by the operator. There is a special input routine available. The course can be specified, for example, as a value table or as a function. The course is then stored in a memory of the winding station computer 28 or the central control unit 30 stored. The winding station calculator 28 controls the single drive by means of this course 14 of the finger thread guide 13 such that the symmetry ratio S is increased during the coil travel according to the predetermined course.
QUOTES INCLUDE IN THE DESCRIPTION
This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Cited patent literature

DE 102008015907 A1 [0002, 0009, 0009]
DE 102008015908 A1 [0008]

Claims

Method for producing conical cheeses ( 5 ) characterized in S-twisted yarn characterized in that the S-twisted yarn so on a sleeve ( 18 ) is wound, that forms a p-winding and that the symmetry ratio, that is, the ratio of the laying speed between, as viewed from the operating side, left and right front side of the cheese ( 5 ) while the coil travel is increased.
A method according to claim 1, characterized in that the S-twisted yarn on a conical sleeve ( 18 ) is wound.
A method according to claim 1 or 2, characterized in that the symmetry ratio is increased exponentially, linearly or suddenly.
Conical cheese ( 5 ) comprising a sleeve ( 18 ) and a yarn package of S-twisted yarn, wherein the package is formed as a p-winding and the conicity of the lower yarn layers is less than the conicity of the upper yarn layers.
Conical cheese ( 5 ), according to claim 4, characterized in that the sleeve as a conical sleeve ( 18 ) is trained.
Winding device ( 4 ) for producing a conical cross-wound coil designed as a p-winding ( 5 ), comprising a coil frame ( 8th ) for holding a conical sleeve ( 18 ), a single motor driven laying device ( 10 ) for laying a thread ( 16 ) on the cheese ( 5 ) and a device for driving the cheese ( 5 ), characterized in that a control device ( 28 ) for controlling the laying device ( 10 ), which is designed so that the symmetry ratio, that is, the ratio of the laying speed between, as viewed from the operating side, left and right end face of the cheese ( 5 ) while the coil travel is increased.