Method of precision winding of textile yarn into packages by frequently changing the wind ratio within one winding cycle

Abstract

The method of precision winding of yarn into packages by frequently changing the wind ratio within one winding cycle solves the problem related to frictional force “F r ”, which is generated in the odd layer at unwinding of packages, by introducing a quite innovative technique of threads winding on the tube in odd winding-on layers and even layers. To carry out the method according to this invention, it does not matter if the driver of thread guides of the winder, on which a package is wound, changes the direction of its rotation or not. If the driver of thread guide, i.e. the servomotor does not change the direction of rotation, it must be taken into consideration that the number of guides should be a multiple of the length of thread guides carriers, and the distance between them should match the length “L” of the package. The thread can be wound on a cylindrical or conical tube, with or without flanges at back end of the package. Odd layers are wound equally from virtual point “b′” to virtual point “d′”, and even layers are wound equally from virtual point “f′” to virtual point “g′”. Thus, the key characteristic of the method according to this invention is that there is no difference between the technique of odd layer and the technique of even layer winding-on within one winding cycle, regardless of whether the package is wound with five cones or on cylindrical or conical tube, with flange or without flange at the back end of package, or with two cones and with disc-shaped flange at its back end.

1 . A method of precision winding of textile yarn into packages, the method comprising:
 providing a cylindrically or conically shaped tube with or without added flanges on a back end of the tube;   providing a thread guide driven by a servomotor such that said thread guide changes a direction of rotation;   frequently changing a wind ratio in one and the same winding cycle based on movement of the thread guide through several cycles of winding of odd and even layers onto said cylindrically or conically shaped tube during which a package of yarn having five outside cones, or four outside cones and one inside cone, with a conical flange on the back end of the package is formed inside corresponding segments and sector along an entire length of the package, wherein in a first part of a first cycle said thread guide moves along a path “L” in a direction “C” during winding of an odd layer and moves along said path “L” in a direction “D” during winding of an even layer, whereby said thread guide moves corresponding to thread guide speed “V 1 ”, “V 2 ” through virtual points “a′-b′-c′-d′-e′-f′-g′-a*′” of path “L” to create seven first speed segments of winding “a′-b”, “b-c”, “c-d”, “d-e′”, “e′-f”, “f-g” and “g-a*′” in said first part of said first cycle, said thread guide moving along said seven first speed segments of winding at varying speeds during said first part of said first cycle, wherein in a second part of said first cycle said thread guide with thread moves along said path “L” in said direction “C” during a winding of another odd layer and said thread guide with thread moves along said path “L” in said direction “D” during a winding of another even layer in direction “D”, whereby in said second part of said first cycle said thread guide moves corresponding to said thread guide speed “V 1 ”, “V 2 ” through virtual points “a*′-b′*-c*′-d*′-e*′-f*′-g*′-a**′” of said path “L” to create seven second speed segments of winding “a*′-b*”, “b*-c*”, “c*-d*”, “d*-e*”′, “e*′-f*”, “f*-g*” and “g*-a**′”, said thread guide moving along said second speed segments of winding at varying speeds and step winds the package during said second part of said first cycle.   
     
     
         2 . A method of precision winding of textile yarn into packages, the method comprising:
 providing cylindrically or conically shaped tubes, each tube having an added flange on a back end of said tube;   providing one or more thread guides driven by a servomotor, each thread guide being fixed such each thread guide does not change a direction of rotation;   frequently changing a wind ratio in each winding cycle based on movement of said thread guides through several cycles of winding of odd and even layers onto one of said cylindrically or conically shaped tubes during which a package with two outside cones is formed inside corresponding segments and sectors, wherein said one of said thread guides moves at a speed “b”, said one of said thread guides carrying thread from virtual point “b′” at a back end of said package to virtual point “c′” at said speed “b”, said one of said thread guides carrying said thread at an accelerated speed to virtual point “d′” at a front end of said package, said one of said thread guides delivering thread at a speed “d” to another of said thread guides in point “f′” to complete a first portion of a first cycle, said point “f” corresponding to point “d′”, said speed “f′” being equal to speed “d”, said another of said thread guides moves with decreasing speed “V 1 ”, “V 2 ” to another virtual point “g′”, said virtual point “g′” corresponding to point “b′”, said another of thread guides having a speed “g”, said speed “g” being equal to said speed “b”, said another of said thread guides delivering thread to yet another one of said thread guides to complete a second portion of said first cycle, said yet another one of said thread guides moving at said speed “b” towards said front end of said package, wherein said first portion and said second portion of said first cycle is repeated in a cyclical sequence until winding of thread into said package is completed, said package not being step wound.   
     
     
         3 . A method of precision winding of textile yarn into packages, the method comprising:
 providing a cylindrically or conically shaped tube without added flanges;   frequently changing a wind ratio of each winding cycle based on movement of a thread guide through several double cycles of winding of odd and even layers, said thread guide being driven by a servomotor such that rotation of said thread guide varies;   forming a package with five outside cones located within corresponding segments and sectors by winding thread about said cylindrically or conically shaped tube based on said frequently changing wind ratio, wherein in a first portion of a first cycle said thread guide with thread traverses path “L” in a direction “C” to form an odd layer and said thread guide traverses said path “L” in a direction “D” to form an even layer, said direction “D” being opposite said direction “C”, whereby said thread guide moves based on an absolute thread guide speed “V 1 ”, “V 2 ” through virtual points “a′-b-c-d-e′-f-g-a*′” of path “L” to create seven first speed segments of winding “a′-b”, “b-c”, “c-d”, “d-e′”, “e′-f”, “f-g” and “g-a*′” in said first poron of said first cycle, said thread guide extending along said seven first speed segments of winding at varying speeds, said thread guide with thread moving along said path “L” in said direction “C” to form another odd layer and said thread guide moving along path “L” in said direction “D” to form another even layer during a second portion of said first cycle, whereby said thread guide moves at a speed “V 1 ”, “V 2 ” through virtual points “a*′-b*-c*-d*-e*′-f*-g*-a**′” of path “L” to create seven second speed segments of winding “a*′-b*”, “b*-c*”, “c*- d*”, “d*-e*′”, “e*′-f*”, “f*-g*” and “g*-a** ′” during said second portion of said first cycle, said thread guide extending along said seven second speed segments of winding at varying speeds, wherein the formed package of thread is step wound.   
     
     
         4 . A method according to  claim 1 , wherein thread is step wound on said tube by changing a rotation direction of said servomotor such that said rotation direction and speed of said thread guide changes during winding of said package, and by providing continuous changing of the length of tube and package throughout the entire length of travel of said thread guide of thread, by changing the number of impulses for the parameter of tube and package length in the application program loaded into the control unit memory. 
     
     
         5 . A method according to  claim 2 , wherein thread is not step wound on said tube by not changing rotation direction of the servomotor such that said rotation direction of said thread guides is not change during winding of package, and by providing non-continuous changing of a length of said tube and package by changing a number of thread guides of threads on a respective thread guide carrier. 
     
     
         6 . The method according to  claim 1 , wherein movement of said thread guide of thread which, at winding of first odd layer in the first cycle, starts with accelerated speed in direction “C” from a point of standstill “a′” towards point “b′”, in which said thread guide reaches programmed speed “b”, said thread guide moving steadily and with the unchanged wind ratio to point “c′”, said thread guide producing substantially parallel winding of thread in odd layer by considering a pre-programmed distance between helices, with speed “b” being equal to speed “c” in point “c′”, and with said thread guide reaching point “b′” before the package makes one revolution. 
     
     
         7 . A method according to  claim 1 , wherein said thread guide reaches a programmed speed “d” in path “L” from point “c′” to point “d′”, said speed “d” being a maximum speed of said thread guide during winding of odd layer, said thread being cross wound on said tube within section defined by point “c′” to point “d′” such that a distance between helices of thread increases from point “c′” to point “d′”, said thread guide of thread moving with accelerated speed from point “b′” to point “d′” when the point “c′” coincides with the point “b′”. 
     
     
         8 . A method according to  claim 2 , wherein said thread guide reaches a programmed speed “d” in path “L” from point “c′” to point “d′”, said speed “d” being a maximum speed of said thread guide during winding of odd layer, said thread being cross wound on said tube within section defined by point “c′” to point “d′” such that a distance between helices of thread increases from point “c′” to point “d′”, said thread guide of thread moving with accelerated speed from point “b′” to point “d′” when the point “c′” coincides with the point “b′”. 
     
     
         9 . A method according to  claim 3 , wherein said thread guide reaches a programmed speed “d” in path “L” from point “c′” to point “d′”, said speed “d” being a maximum speed of said thread guide during winding of odd layer, said thread being cross wound on said tube within section defined by point “c′” to point “d′” such that a distance between helices of thread increases from point “c′” to point “d′”, said thread guide of thread moving with accelerated speed from point “b′” to point “d′” when the point “c′” coincides with the point “b′”. 
     
     
         10 . A method according to  claim 4 , wherein one or more tubes and one or more thread guides are provided, one of said thread guide guiding thread onto one of said tubes. 
     
     
         11 . A method according to  claim 5 , wherein at least two guides guide thread onto one of said tubes. 
     
     
         12 . A method according to  claim 2 , wherein a number of guides provided is a multiple of a length of a thread guide carrier and a distance between one thread guide and another thread guide is equal to length “L” of the package. 
     
     
         13 . A method according to  claim 1 , wherein two, asymmetric, methods of winding of odd layer and even layer in one cycle of winding of thread on tubes are identical from point “b′” to point “d′” in odd layer, and from point “f′” to point “g′” in even layer, either at winding of packages with five cones on cylindrical or conical tubes, with or without conical flange or disc-shaped flange, or at winding of packages with only two cones, with disc-shaped flange at back end of tube, and producing at the same time a structure of odd layers, said structure of odd layers being different from a structure of even layers. 
     
     
         14 . A method according to  claim 2 , wherein two, asymmetric, methods of winding of odd layer and even layer in one cycle of winding of thread on tubes are identical from point “b′” to point “d′” in odd layer, and from point “f′” to point “g′” in even layer, either at winding of packages with five cones on cylindrical or conical tubes, with or without conical flange or disc-shaped flange, or at winding of packages with only two cones, with disc-shaped flange at back end of tube, and producing at the same time a structure of odd layers, said structure of odd layers being different from a structure of even layers. 
     
     
         15 . A method according to  claim 3 , wherein two, asymmetric, methods of winding of odd layer and even layer in one cycle of winding of thread on tubes are identical from point “b′” to point “d′” in odd layer, and from point “f′” to point “g′” in even layer, either at winding of packages with five cones on cylindrical or conical tubes, with or without conical flange or disc-shaped flange, or at winding of packages with only two cones, with disc-shaped flange at back end of tube, and producing at the same time a structure of odd layers, said structure of odd layers being different from a structure of even layers. 
     
     
         16 . A method according to  claim 7 , wherein an angle “α” between the helices of thread in odd layers is substantially equal to a right angle of “90°” except at a front end of the package between virtual points “c′” and “d′”, wherein thread is cross-wound at the front of the package between virtual points “c′” and “d′”. 
     
     
         17 . A method according to  claim 1 , wherein by winding of thread on tube, in sectors “L 3 ”, “L 4 ”, “L 5 ”, the wind ratio is changing at each revolution of tube, which means with each helix of thread. 
     
     
         18 . A method according to  claim 1 , wherein at least one odd layer in direction “C” and one even layer in direction “D” are wound in each cycle of winding of thread onto tube. 
     
     
         19 . A method according to  claim 2 , wherein at least one odd layer in direction “C” and one even layer in direction “D” are wound in each cycle of winding of thread onto tube. 
     
     
         20 . A method according to  claim 3 , wherein at least one odd layer in direction “C” and one even layer in direction “D” are wound in each cycle of winding of thread onto tube. 
     
     
         21 . A method according to  claim 1 , wherein helices of threads of odd layer and helices of even layer from two adjacent sectors “L 2 ” and “L 4 ” are located inside sector “L 3 ”. 
     
     
         22 . A method according to  claim 21 , wherein the sector “L 3 ” begins in a vertical plane positioned perpendicular to an axis of tube, and ends in a plane which perpendicular to the axis of tube, and the both planes are connected with diagonal line simulating a shift of a starting point of winding of a cross-wound portion of odd layers towards the back end of the package. 
     
     
         23 . A method according to  claim 1 , wherein a conical flange or disc-shaped flange positioned on tubes is used instead of an outside cone to stabilize the back end of the package.