EP1602756B1 - Method and apparatus for manufacturing special yarn - Google Patents

Method and apparatus for manufacturing special yarn Download PDF

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Publication number
EP1602756B1
EP1602756B1 EP05011036.0A EP05011036A EP1602756B1 EP 1602756 B1 EP1602756 B1 EP 1602756B1 EP 05011036 A EP05011036 A EP 05011036A EP 1602756 B1 EP1602756 B1 EP 1602756B1
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EP
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Prior art keywords
rotation speed
pair
rollers
slub
front rollers
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EP05011036.0A
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German (de)
English (en)
French (fr)
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EP1602756A3 (en
EP1602756A2 (en
Inventor
Yutaka Shinozaki
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Toyota Industries Corp
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Toyota Industries Corp
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Publication of EP1602756A3 publication Critical patent/EP1602756A3/en
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
    • D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
    • D01H5/32—Regulating or varying draft
    • D01H5/36—Regulating or varying draft according to a pre-arranged pattern, e.g. to produce slubs
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
    • D02G3/36—Cored or coated yarns or threads
    • D02G3/367—Cored or coated yarns or threads using a drawing frame

Definitions

  • the present invention relates to a method and an apparatus for manufacturing a special yarn, and more specifically to a method and an apparatus for manufacturing a special yarn having an actual thickness profile corresponding to a designed thickness profile.
  • a special yarn which is referred to as slub yarn or a fancy yarn, is known in the prior art.
  • the thickness of the slub yarn is not constant and includes reference thickness portions (no-slub portions) and large diameter portions (slub portions), which are thicker than the reference thickness portions.
  • the basic structure of the spinning frame used for manufacturing the slub yarn is the same as that of the ring spinning frame, and the spinning frame includes a pair of front rollers and a group of back rollers, which can independently change the rotation speed, at a draft part.
  • the rotation speed of either the pair of front rollers or the group of back rollers is changed by a control section to manufacture the special yarn having the actual thickness profile corresponding to the designed thickness profile (for example, see Japanese Laid-Open Patent Publication No. 62-199821 ).
  • slub yarn SY are manufactured by changing the rotation speed of the pair of front rollers based on a designed thickness profile DP shown in Fig. 6 .
  • the rotation speed of the pair of front rollers is started to be decreased.
  • the rotation speed of the pair of front rollers is decreased at a predetermined deceleration slope A1 from a reference speed (original speed) N0 to a predetermined speed N1.
  • the rotation speed of the pair of front rollers is started to be increased.
  • the rotation speed of the pair of front rollers is increased to the reference speed N0 at a predetermined acceleration slope A2. Furthermore, the rotation speed of the pair of front rollers is started to be decreased again at a point in time when the spinning time of the length corresponding to the slub pitch P of the designed thickness profile DP has elapsed from when the rotation speed of the pair of front rollers is started to be increased.
  • DE 4041301A1 discloses a method according to the preamble of claim 1 and an apparatus according to the preamble of claim 4.
  • the thickness profile including the slub thickness; the slub length; and the slub pitch
  • the time required for the acceleration or the deceleration of an adjustable-speed motor which drives the pair of front rollers or the group of back rollers is not taken into consideration. Therefore, even if manufacturing is performed based on the designed thickness profile DP of Fig.
  • the slub length of the actually obtained slub yarn SY is equal to "L + La", which is longer than the slub length L of the designed thickness profile DP by a yarn length La spun during acceleration of the adjustable-speed motor, and the slub pitch of the actually obtained slub yarn SY is equal to "P - La", which is shorter than the slub pitch P of the designed thickness profile DP by the yarn length La as shown in Fig. 6 .
  • the thickness profile of the actually obtained slub yarn SY is not equal to the designed thickness profile.
  • a method for manufacturing slub yarn that changes the rotation speed of not only either the pair of front rollers or the group of back rollers, but the rotation speeds of both the pair of front rollers and the group of back rollers simultaneously to increase the slub thickness.
  • the slub portion having the target thickness does not appear. Therefore, the thickness profile of the slub yarn obtained through this method is not equal to the designed thickness profile.
  • a method according to the present invention is provided for manufacturing a special yarn, which has an actual thickness profile corresponding to a designed thickness profile, by changing the rotation speed of a pair of front rollers or a group of back rollers of a draft part from a reference speed to a predetermined speed, and thereafter returning the rotation speed to the reference speed based on the designed thickness profile including a slub length.
  • the pair of front rollers and the group of back rollers are driven by different motors.
  • the method includes computing, in advance, a yarn length spun while the rotation speed of the pair of front rollers or the group of back rollers is returned from the predetermined speed to the reference speed, and when the rotation speed of the pair of front rollers or the group of back rollers is changed from the reference speed to the predetermined speed, controlling the corresponding motor such that the rotation speed of the pair of front rollers or the group of back rollers the rotation speed of which has been changed is started to be returned at a point in time at which a yarn length spun from when the rotation speed is started to be changed reaches a value obtained by subtracting the yarn length computed in advance from the slub length of the designed thickness profile.
  • the present invention provides an apparatus for manufacturing a special yarn that includes a draft part and a control section.
  • the draft part includes a pair of front rollers and a group of back rollers.
  • the pair of front rollers and the group of back rollers are driven by different motors.
  • the control section includes a storing section, which stores a designed thickness profile including a slub length.
  • the control section controls the corresponding motor to change the rotation speed of the pair of front rollers or the group of back rollers from a reference speed to a predetermined speed, and thereafter returning the rotation speed to the reference speed based on the designed thickness profile stored in the storing section.
  • the control section further includes a computation section, which computes a yarn length spun while the rotation speed of the pair of front rollers or the group of back rollers is returned from the predetermined speed to the reference speed.
  • the control section controls the corresponding motor such that the rotation speed of the pair of front rollers or the group of back rollers the rotation speed of which has been changed is started to be returned at a point in time at which a yarn length spun from when the rotation speed is started to be changed reaches a value obtained by subtracting the yarn length computed by the computation section from the slub length of the designed thickness profile.
  • An advantage obtainable with embodiments of the present invention is to provide a method and an apparatus for manufacturing a special yarn that enables manufacturing a special yarn that accurately conforms to a designed thickness profile.
  • Fig. 2 shows a special yarn manufacturing apparatus according to a first embodiment.
  • the manufacturing apparatus manufactures special yarn, which is slub yarn in the first embodiment, having a predetermined thickness profile by changing the rotation speed of a pair of front rollers.
  • the manufacturing apparatus of Fig. 2 has basically the same configuration as a ring spinning frame, and more specifically, includes spindles 1 rotated by a spindle drive system.
  • the spindle drive system includes a drive pulley 3, which is driven by a first motor 2, a driven pulley 4, a tangential belt 5, which is wound about the pulleys 3, 4.
  • the first motor 2 is an adjustable-speed motor driven via an inverter 6 and includes a rotary encoder 2a.
  • a rotatable line shaft 7 is located along a row of spindles.
  • the line shaft 7 is provided with lifting units 10 (only one of the lifting units 10 is shown in Fig. 2 ) which lift and lower a ring rail 8 and a lappet (not shown).
  • the lifting units 10 are located at predetermined intervals.
  • the ring rail 8 includes a ring 8a, which permits running of a traveller T, and the lappet includes a snail wire 9.
  • Each lifting unit 10 includes a screw gear 11, which is rotatably secured to the line shaft 7, and a nut body 13, which is engaged with the screw gear 11. Each nut body 13 is screwed to a screw portion 12a, which is located below the corresponding one of poker pillars 12 for supporting the ring rail 8.
  • the line shaft 7 is coupled to a drive shaft of a servo motor, which is a second motor 14 in the first embodiment, via a gear mechanism (not shown).
  • the second motor 14 includes a rotary encoder 14a, and the second motor 14 is controlled via a servo driver 15.
  • the line shaft 7, the lifting units 10, the poker pillars 12 configure a lifting drive system.
  • a draft part 16 includes a pair of front rollers 17 (only a bottom roller is shown in Fig. 2 ) and a group of back rollers including a pair of middle rollers 19 (only a bottom roller is shown in Fig. 2 ) and a back bottom roller 21.
  • the pair of front rollers 17 is coupled to a third motor 18, which is a servo motor and an adjustable-speed motor.
  • the pair of middle rollers 19 is coupled to a fourth motor 20, which is a servo motor and an adjustable-speed motor.
  • the third motor 18 and the fourth motor 20 each include rotary encoders 18a, 20a.
  • the back bottom roller 21 is coupled to the pair of middle rollers 19 via a gear train 22.
  • the pair of front rollers 17 and the group of back rollers are driven by separate adjustable-speed motors.
  • the pair of middle rollers 19 is equipped with aprons 19a.
  • a gear 17a, which rotates integrally with the pair of front rollers 17, is secured to one end of the pair of front rollers 17.
  • a sensor S1, which outputs a pulse signal in accordance with rotation of the pair of front rollers 17, is located in the vicinity of the gear 17a.
  • a control section 23, which controls the first to fourth motors 2, 14, 18, 20, includes a computation section, which is a central processing unit (CPU) 24 in the first embodiment.
  • the control section 23 further includes a program memory 25, a storing section, which is a working memory 26 in the first embodiment, an input section 27, an input interface 28, an output interface 29, and first to fourth motor drive circuits 30 to 33.
  • the CPU 24 is connected to the rotary encoders 2a, 14a, 18a, 20a, the sensor S1, and the input section 27 via the input interface 28.
  • the CPU 24 is further connected to the inverter 6 via the output interface 29 and the first motor drive circuit 30, and to the servo driver 15 via the output interface 29 and the second motor drive circuit 31.
  • the CPU 24 is further connected to the third motor 18 via the output interface 29, the third motor drive circuit 32, and a servo driver 34, and to the fourth motor 20 via the output interface 29, the fourth servo motor drive circuit 33, and a servo driver 35.
  • the CPU 24 operates based on a predetermined program data stored in the program memory 25.
  • the program memory 25 is a read only memory (ROM) and stores the program data and various data necessary for executing the program data.
  • the program data stored in the program memory 25 includes a control program for the first motor 2 and the second motor 14 during winding-up operation, and a program that calculates an acceleration time Ta, a deceleration time Td, and a yarn length La spun during the acceleration time Ta, which are described later, and controls the third motor 18 to change the rotation speed of the pair of front rollers 17 based on these information.
  • the various data stored in the program memory 25 includes: data regarding the spindle rotation speed during the normal operation, the rotation speed of the third motor 18, the rotation speed of the fourth motor 20, and the lifting and lowering speed of the ring rail 8, which correspond to the spinning condition such as types of fiber to be used, the count of the no-slub portion of the desired slub yarn, and the draft ratio; a deceleration slope A1 and an acceleration slope A2, which are described later; a computing equation for computing the rotation speed of the pair of front rollers 17 that should be set for obtaining the desired slub thickness.
  • the working memory 26 is a random access memory (RAM) and temporarily stores data from the input section 27 and the result of the computation performed by the CPU 24.
  • the working memory 26 includes a backup power source (not shown).
  • the input section 27 is used for inputting the spinning condition data such as the designed thickness profile of the desired slub yarn, the count of the no-slub portion of the desired slub yarn, the spindle rotation speed when spinning the no-slub portion, the lift length, and the chase length.
  • a designed thickness profile DP shown in Fig. 1 includes the slub length L, which is the length of a slub portion S the diameter of which is larger than a no-slub portion Y0, the slub thickness D, which is the thickness of the slub portion S, the distance between the adjacent slub portions S, that is, the slub pitch P, which is the length of the no-slub portion Y0.
  • the slub thickness D is the percentage of the thickness of the slub portion S to the thickness of the no-slub portion Y0.
  • the slub thickness D is 150%, and if the thickness of the slub portion S is twice the thickness of the no-slub portion Y0, the slub thickness D is 200%.
  • the CPU 24 computes, based on the slub thickness D of the designed thickness profile DP stored in the working memory 26, the rotation speed of the pair of front rollers 17 required during spinning of the slub portion S, that is, a decelerated rotation speed N1 (rpm) by the following equation (1).
  • N0 represents the rotation speed of the pair of front rollers 17 required during spinning of the no-slub portion Y0, that is, a reference rotation speed (rpm).
  • N 1 100 N 0 / D
  • the CPU 24 computes the deceleration time Td, which is the time required for the rotation speed of the pair of front rollers 17 to decrease from the reference rotation speed N0 to the decelerated rotation speed N1, using the computed decelerated rotation speed N1 and the predetermined deceleration slope A1 by the following equation (2).
  • the CPU 24 further computes the acceleration time Ta, which is the time required for the rotation speed of the pair of front rollers 17 to increase from the decelerated rotation speed N1 to the reference rotation speed N0, using the decelerated rotation speed N1 and the predetermined acceleration slope A2 by the following equation (3).
  • the CPU 24 computes the average rotation speed NE (rpm) of the pair of front rollers 17 during the deceleration time Td and the acceleration time Ta. Then, the CPU 24 computes the yarn length Ld spun during the deceleration time Td using the average rotation speed NE according to the following equation (4). In the same manner, the CPU 24 computes the yarn length La spun during the acceleration time Ta using the average rotation speed NE according to the following equation (5).
  • d represents the outer diameter (mm) of each roller of the pair of front rollers 17.
  • Ld Td ⁇ d ⁇ ⁇ ⁇ NE / 60
  • La Ta ⁇ d ⁇ ⁇ ⁇ NE / 60
  • the spinning condition is entered in the control section 23 via the input section 27.
  • the spinning condition to be entered includes the designed thickness profile DP of the desired slub yarn, the count of the no-slub portion of the slub yarn, the spindle rotation speed during spinning of the no-slub portion, the lift length, the chase length, and the like.
  • the first to fourth motors 2, 14, 18, 20 are controlled in accordance with commands from the control section 23.
  • the CPU 24 computes the rotation speed of the first to fourth motors 2, 14, 18, 20 based on output signals from the rotary encoders 2a, 14a, 18a, 20a. Then, the CPU 24 outputs command signals for driving the spindle drive system, a draft part drive system, and the lifting drive system in sync at a predetermined speed corresponding to the spinning condition.
  • the command signals are transmitted to the inverter 6 and the servo drivers 15, 34, 35 via the output interface 29 and the first to fourth motor drive circuits 30 to 33.
  • the spindle drive system, the draft part drive system, and the lifting drive system are independently driven in sync, and yarn Y supplied from the draft part 16 is wound up by a bobbin B via the corresponding snail wire 9 and the traveller T.
  • the CPU 24 computes the number of rotations of the pair of front rollers 17, that is, the spun yarn length based on output signals from the sensor S1. Furthermore, when spinning the slub portion S, the CPU 24 computes the rotation speed of the pair of front rollers 17 required during spinning of the slub portion S, that is, the decelerated rotation speed N1 based on the desired thickness of the slub portion S according to the equation (1).
  • the CPU 24 computes the deceleration time Td, which is the time required for the rotation speed of the pair of front rollers 17 to decrease from the reference rotation speed N0 to the decelerated rotation speed N1 at the predetermined deceleration slope A1, according to the equation (2), and the acceleration time Ta, which is the time required, for the rotation speed of the pair of front rollers 17 to increase from the decelerated rotation speed N1 to the reference rotation speed N0 at the predetermined acceleration slope A2, according to the equation (3). Based on the computation results, the CPU 24 further computes the yarn length La spun during the acceleration time Ta according to the equation (5).
  • the CPU 24 outputs a deceleration command to the third motor 18 during the deceleration time Td from when the rotation speed of the pair of front rollers 17 is started to be decreased. Simultaneously, the CPU 24 computes the spun yarn length from when the rotation speed is started to be decreased based on the output signal of the sensor S1. The CPU 24 outputs an acceleration command to the third motor 18 at the point in time TFas at which the yarn length spun from when the rotation speed is started to be decreased reaches a value (L - La) obtained by subtracting the yarn length La from the slub length L of the designed thickness profile DP.
  • the rotation speed of the pair of front rollers 17 returns to the reference rotation speed N0 in the acceleration time Ta, and formation of the slub portion S is completed.
  • the length of the slub portion S formed as described above conforms to the slub length L of the designed thickness profile DP.
  • slub yarn SY is spun.
  • the first embodiment provides the following advantages.
  • the second embodiment differs from the first embodiment in the control method of the draft part 16. More specifically, the second embodiment differs from the first embodiment in that the rotation speeds of both the pair of front rollers 17 and the pair of middle rollers 19 are changed instead of changing the rotation speed of the pair of front rollers 17. The rotation speeds of both the pair of front rollers 17 and the pair of middle rollers 19 are changed to further increase the slub thickness.
  • the mechanical configuration of a special yarn manufacturing apparatus according to the second embodiment is the. same as the manufacturing apparatus of Fig. 2 . Accordingly, differences from the first embodiment will mainly be discussed below, and explanations of components that are like or the same as the components of the first embodiment are omitted.
  • the rotation speed of the pair of front rollers 17 when spinning the slub portion S is set lower than the rotation speed of the pair of front rollers 17 when spinning the no-slub portion Y0, and the rotation speed of the pair of middle rollers 19 when spinning the slub portion S is set higher than the rotation speed of the pair of middle rollers 19 when spinning the no-slub portion Y0.
  • the slub portion S having the desired thickness does not appear immediately after changing the rotation speeds. This is because, even if the rotation speeds of both the pairs of rollers 17, 19 are simultaneously changed, the draft ratio of the fleece F supplied from the nip point NP will not become the desired value until all the fleece F (see Fig. 4 ) located between the nip point NP of the pair of front rollers 17 and the distal ends of the aprons 19a of the pair of middle rollers 19 at the point in time when the rotation speed is changed passes through the nip point NP.
  • the distance Lm the distance between the nip point NP of the pair of front rollers 17 and the distal ends of the aprons 19a of the pair of middle rollers 19
  • the difference corresponding to the distance Lm is generated from when the rotation speeds of both the pairs of rollers 17, 19 are simultaneously changed until the slub portion S having the desired thickness appears.
  • the point in time TMas at which the rotation speed of the pair of middle rollers 19 is started to be increased is set to be earlier than the point in time TFds at which the rotation speed of the pair of front rollers 17 is started to be decreased. Furthermore, the point in time TMds at which the rotation speed of the pair of middle rollers 19 is started to be decreased is set to be earlier than the point in time TFas at which the rotation speed of the pair of front rollers 17 is started to be increased.
  • the CPU 24 performs substantially the same control as the first embodiment regarding the pair of front rollers 17.
  • the CPU 24 computes the rotation speed of the pair of middle rollers 19 required when spinning the slub portion S, that is, an accelerated rotation speed NB1 (rpm).
  • the CPU 24 computes an acceleration time TMa, which is the time required for the rotation speed of the pair of middle rollers 19 to increase from a reference rotation speed NB0 (the rotation speed of the pair of middle rollers 19 required when spinning the no-slub portion Y0) to the accelerated rotation speed NB1, using the computed accelerated rotation speed NB1 and a predetermined acceleration slope B1 according to the following equation (6).
  • the CPU 24 computes the average rotation speed NMe of the pair of middle rollers 19 during the acceleration time TMa and the deceleration time TMd. Then, using the average rotation speed NMe, the CPU 24 computes the time TaLm required for spinning a yarn having the length that is the same as the distance Lm during the acceleration time TMa and the time TdLm required for spinning a yarn having the length that is the same as the distance Lm during the deceleration time TMd.
  • the CPU 24 changes the rotation speeds of the pair of front rollers 17 and the pair of middle rollers 19 based on the designed thickness profile DP.
  • the CPU 24 sets the point in time TMas at which the rotation speed of the pair of middle rollers 19 is started to be increased to be earlier than the point in time TFds at which the rotation speed of the pair of front rollers 17 is started to be decreased by the time TaLm, and the point in time TMds at which the rotation speed of the pair of middle rollers 19 is started to be decreased to be earlier than the point in time TFas at which the rotation speed of the pair of front rollers 17 is started to be increased by the time TdLm.
  • the slub portion S having the desired thickness is started to be formed from when the rotation speed of the pair of front rollers 17 is started to be decreased, and formation of the slub portion S is completed at the point in time when increasing the rotation speed of the pair of front rollers 17 is completed. Therefore, the slub yarn SY having the slub length L and the slub pitch P that accurately conform to the designed thickness profile DP is obtained.
  • the second embodiment not forming part of the present invention provides the following advantages in addition to the advantages (1) and (3) of the first embodiment.
  • the third embodiment differs from the first embodiment in the control method of the draft part 16. More specifically, the third embodiment differs from the first embodiment in that the rotation speed of the group of back rollers including the pair of middle rollers 19 is changed instead of the rotation speed of the pair of front rollers 17.
  • the mechanical configuration of a special yarn manufacturing apparatus according to the third embodiment is the same as the manufacturing apparatus of Fig. 2 . Accordingly, differences from the first embodiment will mainly be discussed below, and explanations of components that are like or the same as the components of the first embodiment are omitted.
  • the CPU 24 computes the acceleration time TMa, which is the time required for the rotation speed of the pair of middle rollers 19 to increase from the reference rotation speed NB0 to the accelerated rotation speed NB1, and the deceleration time TMd, which is the time required for the rotation speed of the pair of middle rollers 19 to be decreased from the accelerated rotation speed NB1 to the reference rotation speed NB0.
  • the CPU 24 further computes the yarn length Ld spun during the deceleration time TMd.
  • the rotation speed of the pair of middle rollers 19 is increased in the acceleration time TMa from the reference rotation speed NB0 to the accelerated rotation speed NB1 by the acceleration slope B1. Then, the rotation speed of the pair of middle rollers 19 is started to be decreased at the point in time when the yarn length spun from when the rotation speed is started to be increased reaches a value (L-Ld) obtained by subtracting the yarn length Ld from the slub length L of the designed thickness profile DP. Then, the rotation speed of the pair of middle rollers 19 returns to the reference rotation speed NB0 in the deceleration time TMd, and formation of the slub portion S is completed.
  • the length of the slub portion S formed as described conforms to the slub length L of the designed thickness profile DP.
  • the ring spinning frame generally estimates the point in time of full bobbin based on the integrated value of the rotation speed of the pair of front rollers 17, prepares for doffing in accordance with the point in time, and retracts a cleaning device that travels along the spinning frame such that the cleaning device does not hinder doffing. Therefore, if the slub portion S is formed by changing the rotation speed of the pair of front rollers 17 to change the draft ratio, estimation of the point in time of full bobbin is difficult. Therefore, preparation for doffing and retraction of the cleaning device are hindered. However, in the third embodiment, since the slub portion S is formed by changing the rotation speed of the pair of middle rollers 19, estimation of the point in time of full bobbin is not difficult as in the prior art.
  • the rotation speed of the pair of front rollers 17 is changed, the number of twists varies if the rotation speed of the spindles 1 is constant. Therefore, in a case where variation of the number of twists is not preferable, the rotation speed of the spindles 1 also needs to be changed in accordance with the change of the rotation speed of the pair of front rollers 17. This complicates the control.
  • the slub portion S is formed by changing the rotation speed of the pair of middle rollers 19, the rotation speed of the spindles 1 does not need to be changed to prevent variation of the number of twists.
  • the designed thickness profile DP may be entered by an operator through directly entering the slub length L, the slub thickness D, and the slub pitch P using the input section 27, or through selecting and determining one of the designed thickness profiles DP stored in the program memory 25 using the input section 27.
  • the designed thickness profile DP may include a combination of the slub length L, the slub thickness D and the slub pitch P determined using a random number table from a set of the slub lengths L, a set of the slub thicknesses D, and a set of the slub pitches P stored in the program memory 25.
  • the designed thickness profile DP may be produced using the set of the slub lengths L, the set of the slub thicknesses D, the set of the slub pitches P, which are stored in the program memory 25, and the random number table.
  • the deceleration slope A1 and the acceleration slope A2 of the pair of front rollers 17 do not need to be constants, but may be variables that vary in accordance with the thickness of the slub portion S.
  • the acceleration slope B1 and the deceleration slope B2 of the pair of middle rollers 19 do not need to be constants, but may be variables that vary in accordance with the thickness of the slub portion S. In these cases, the shape of both ends of the slub portion S can be adjusted.
  • the deceleration slope A1 and the acceleration slope A2 of the pair of front rollers 17 may be changed in accordance with whether the type of the fiber used is cotton or synthetic fiber.
  • the acceleration slope B1 and the deceleration slope B2 of the pair of middle rollers 19 may also be changed in accordance with whether the type of the fiber used is cotton or synthetic fiber. Even if the slub portion S having the same thickness is formed, the roller pressures of the pair of front rollers 17 and the group of back rollers differ depending on the type of the fiber used such as cotton or synthetic fiber. More specifically, the roller pressures are reduced when cotton is used, and a load applied to a motor that drives the rollers is small as compared to a case where synthetic fiber is used.
  • the motor accelerates slowly and decelerates promptly. Therefore, depending on whether the type of fiber used is cotton or synthetic fiber, the appropriate speed change slope when controlling the third motor 18 to change the rotation speed of the pair of front rollers 17 differs, and the appropriate speed change slope when controlling the fourth motor 20 to change the rotation speed of the pair of middle rollers 19 differs.
  • the deceleration slope A1, B2 and the acceleration slope A2, B1 are preferably different.
  • the speed change slope appropriate for the slub portion S with any thickness is calculated by a proportional calculation.
  • the absolute values of the deceleration slope A1 and the acceleration slope A2 of the pair of front rollers 17 may be the same. Furthermore, the absolute values of the acceleration slope B1 and the deceleration slope B2 of the pair of middle rollers 19 may be the same.
  • the pair of middle rollers 19 and the back bottom rollers 21 may be driven by separate adjustable-speed motors. In this case, even if the rotation speed of the pair of middle rollers 19 is changed as in the second embodiment and the third embodiment, and the slub thickness D.is great, the fleece F is smoothly supplied from the pair of middle rollers 19.
  • the slub portion S may be formed by changing the rotation speeds of both the pair of front rollers 17 and the pair of middle rollers 19, and when the slub thickness D is less than the predetermined value, the slub portion S may be formed by changing the rotation speed of one of the pair of front rollers 17 and the pair of middle rollers 19. This facilitates the control as compared to a case where the rotation speeds of both the pair of front rollers 17 and the pair of middle rollers 19 are changed regardless of the slub thickness D.
  • a predetermined value for example 200%
  • the rotation speed of the pair of front rollers 17 may be started to be increased at the point in time when the yarn length spun from when the rotation speed of the pair of front rollers 17 is started to be decreased reaches the slub length L of the designed thickness profile DP.
  • increase of the rotation speed of the pair of middle rollers 19 is set to be earlier than when the rotation speed of the pair of front rollers 17 is started to be decreased by the time required for the fleece F to move the distance Lm from the downstream ends of the aprons 19a to the nip point NP, and starting of decreasing the rotation speed of the pair of middle rollers 19 is set to be earlier than when the rotation speed of the pair of front rollers 17 is started to be increased by the time required for the fleece F to move the distance Lm from the downstream ends of the aprons 19a to the nip point NP.
  • the slub portion S having the desired thickness is started to be formed from the point in time at which the rotation speed of the pair of front rollers 17 is started to be decreased, and formation of the slub portion S is completed at the point in time at which increasing of the rotation speed of the pair of front rollers 17 is completed.
  • the spindles 1 and the pair of front rollers 17 may be driven by the same motor.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
EP05011036.0A 2004-05-24 2005-05-20 Method and apparatus for manufacturing special yarn Active EP1602756B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004153532 2004-05-24
JP2004153532A JP4333477B2 (ja) 2004-05-24 2004-05-24 特殊糸の製造方法

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EP1602756A2 EP1602756A2 (en) 2005-12-07
EP1602756A3 EP1602756A3 (en) 2006-06-21
EP1602756B1 true EP1602756B1 (en) 2016-06-29

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JP (1) JP4333477B2 (ja)
CN (1) CN100398712C (ja)
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EP2038458B1 (de) * 2006-06-30 2013-07-31 Amsler Tex AG Verfahren und vorrichtung zur herstellung von kurzen garneffekten
WO2008113692A1 (de) * 2007-03-19 2008-09-25 Amsler Tex Verfahren zur herstellung eines bebilderten gewebes
JP5370463B2 (ja) * 2011-11-07 2013-12-18 株式会社豊田自動織機 特殊糸の製造方法
JP5874775B2 (ja) * 2014-04-03 2016-03-02 株式会社豊田自動織機 紡機におけるドラフト装置
JP2017001779A (ja) * 2015-06-05 2017-01-05 村田機械株式会社 精紡機、糸巻取システム、及び給糸ボビンの製造方法
EP3350364A2 (en) 2015-09-18 2018-07-25 Amsler Tex AG Device and method for making of a stretch yarn
CN109750401B (zh) * 2019-03-13 2023-11-14 愉悦家纺有限公司 四通道交变牵伸缠捻包覆环锭花式纱线成型装置及方法

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JPS60119228A (ja) * 1983-12-02 1985-06-26 Howa Mach Ltd 特殊糸の製造装置
JPS62162031A (ja) * 1985-12-30 1987-07-17 Toyoda Autom Loom Works Ltd 特殊糸の製造装置
JPS62199821A (ja) 1986-02-25 1987-09-03 Toyoda Autom Loom Works Ltd 特殊糸の製造装置
CN86207075U (zh) * 1986-09-09 1987-07-08 湖南省汉寿县棉纺厂 一种纺竹节纱用电气自动控制装置
DE4041301A1 (de) * 1990-12-21 1992-06-25 Amsler Iro Ag Spinnmaschine fuer und verfahren zum spinnen von effektgarn
JPH08325860A (ja) * 1995-05-31 1996-12-10 Nippon Boseki Yohin Kenkyusho:Kk 特殊糸を製造するための信号出力装置

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EP1602756A3 (en) 2006-06-21
ES2591238T3 (es) 2016-11-25
CN1702206A (zh) 2005-11-30
EP1602756A2 (en) 2005-12-07
JP4333477B2 (ja) 2009-09-16
JP2005336627A (ja) 2005-12-08
CN100398712C (zh) 2008-07-02

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