EP0953661B1 - Method of forming cop for spinning machine - Google Patents

Method of forming cop for spinning machine Download PDF

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Publication number
EP0953661B1
EP0953661B1 EP19990104035 EP99104035A EP0953661B1 EP 0953661 B1 EP0953661 B1 EP 0953661B1 EP 19990104035 EP19990104035 EP 19990104035 EP 99104035 A EP99104035 A EP 99104035A EP 0953661 B1 EP0953661 B1 EP 0953661B1
Authority
EP
European Patent Office
Prior art keywords
cop
speed
chase
spinning
spinning speed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19990104035
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0953661A3 (en
EP0953661A2 (en
Inventor
Kiwamu Niimi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Industries Corp
Original Assignee
Toyoda Jidoshokki Seisakusho KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toyoda Jidoshokki Seisakusho KK filed Critical Toyoda Jidoshokki Seisakusho KK
Publication of EP0953661A2 publication Critical patent/EP0953661A2/en
Publication of EP0953661A3 publication Critical patent/EP0953661A3/en
Application granted granted Critical
Publication of EP0953661B1 publication Critical patent/EP0953661B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H1/00—Spinning or twisting machines in which the product is wound-up continuously
    • D01H1/14—Details
    • D01H1/36—Package-shaping arrangements, e.g. building motions, e.g. control for the traversing stroke of ring rails; Stopping ring rails in a predetermined position

Definitions

  • the present invention relates to a method of forming a cop through cop winding or filling winding in a spinning machine, and particularly, in a ring spinning frame or a ring twisting frame. More particularly, the present invention is concerned with a cop forming method which allows a cop to be formed in an optimal shape by optimally controlling up/down reciprocative motion of a ring rail in the spinning machine.
  • the outer peripheral surface of the swelled portion of the cop is likely to be brought into contact with the inner surface of the ring, which results in formation of a bar-like flaw in the cop.
  • a flaw is known in the art as an abrasion.
  • the winding diameter of the cop has to be previously set to be small when a change in the spinning speed is expected such as when changing a rove bobbin or traveller. Accordingly, the amount of yarn taken up on the bobbin for the cop will naturally decrease.
  • the present invention is directed to a method of forming a cop in a spinning machine by up/down reciprocative motion of a ring rail for which a chase stroke, a chase speed, a step length and so forth have been set previously.
  • the cop forming mentioned above is characterized by a step in which when a spinning speed changes during cop forming, the up/down reciprocative motion of the ring rail is correspondingly modified based on the change of the spinning speed.
  • chase speed is intended to mean the speed at which the ring rail moves over and along a chase stroke length.
  • the step of modifying the up/down reciprocative motion of the ring rail should preferably be realized as a step of correspondingly changing the step length based on the change of the spinning speed.
  • the step length should preferably be increased, whereas when the spinning speed becomes higher, the step length should be decreased correspondingly.
  • the step of modifying the up/down reciprocative motion of the ring rail should preferably be realized as a step of correspondingly changing the chase speed based on the change of the spinning speed.
  • the chase speed should preferably be increased, whereas when the spinning speed becomes higher, the chase speed should be lowered.
  • a pair of line shafts 2 are disposed and mounted rotatably so as to extend in parallel with the longitudinal direction of a machine frame at an inner side of spindle rails 1.
  • a driving gear 3 and a bevel gear 4 are mounted on the line shaft 2 so as to be rotatable together therewith.
  • a poker pillar 6 which supports a ring rail 5 is vertically and slideably journaled on the spindle rail 1 through a slide guide 7.
  • a nut member 8 is supported rotatably on the spindle rail 1 by a bearing 9 at a position beneath the slide guide 7.
  • a screw portion (thread portion) 6a is formed on the poker pillar 6 at a lower end portion thereof to screwably engage with the nut member 8.
  • a driving gear 10 is mounted on the nut member 8 at a lower end thereof so as to mesh with the driving gear 3.
  • a poker pillar 12 which supports a lappet holding angle bar 11 (see Fig. 3) is vertically and slideably supported relative to the machine frame through a slide guide (not shown). Further, the poker pillar 12 is supported rotatably relative to the machine frame by means of a bearing (not shown).
  • a nut member 13 screwably engages with a screw portion 12a formed at a lower end portion of the poker pillar 12.
  • a bevel gear 14 is mounted on the nut member 13 at a lower end thereof so as to mesh with the bevel gear 4 mounted on the line shaft 2.
  • a line shaft driving system 15 is designed to drive both the line shafts 2 forwardly or reversely. Also, it should be mentioned that the line shaft driving system 15 is formed independently of a spindle/draft portion driving 17 system including a driving shaft (tape pulley shaft) 16 which is driven by a main motor (not shown). A rotary encoder 30 is provided for detecting rotation of the driving shaft 16.
  • the line shaft driving system 15 includes an intermediate shaft 18 which is mounted rotatably between both the line shafts 2 and extends in parallel therewith. Mounted at one end of the intermediate shaft 18 is a gear 21 which meshes with a gear 20 secured to an output shaft 19 of a lifting motor M. A rotary encoder 22 is mounted at the other end portion of the intermediate shaft 18 for detecting the number of revolutions (rpm) of the intermediate shaft 18.
  • a rotatable shaft 23 is disposed so as to extend in the direction orthogonal to the line shaft 2.
  • a worm wheel 24 is mounted on the rotatable shaft 23, and a worm 25 which meshes with the worm wheel 24 is mounted on the intermediate shaft 18.
  • Bevel gears 27 are mounted on the rotatable shaft 23 at both ends thereof, respectively, wherein each of the bevel gears 27 is adapted to mesh with a bevel gear 26 mounted on the line shaft 2 at one end portion thereof.
  • a variable speed reversible motor such as a servo motor or the like may be employed.
  • This lifting motor M is driven under the control of a control unit 28 and a speed change control unit 29. Detection signals derived from the outputs of the rotary encoders 22 and 30 are supplied to the control unit 28.
  • a microcomputer 31 which constitutes a major part of the control unit 28 is composed of a central processing unit 32 (hereinafter referred to as the CPU), a program memory 33 constituted by a read-only memory (ROM) for storing a control program or programs, and a rewritable memory (random access memory or RAM) adapted for temporarily storing results of arithmetic processing and the like executed by the CPU.
  • the CPU 32 operates in accordance with program data stored in the program memory 33.
  • an input device 35 in the form of a keyboard which serves for inputting to the work memory 34 conditions for a cop building motion for forming the cop such as a single lift quantity (chase stroke), a single winding quantity (step length), a moving speed upon up- or down-motion and the like. Moreover, it should be mentioned that there is an optimum moving speed which corresponds to the actual yarn count and the actual number of revolutions (rpm) of the spindle.
  • the CPU 32 is programmed so as to arithmetically determine the up/down standard speed for moving the ring rail 5 up and down, i.e., the standard rotational speed (rpm) of the lifting motor M on the basis of the yarn count input before the frame operation is started and the number of revolutions arithmetically determined on the basis of an output signal of the rotary encoder 30, to thereby generate a control signal for the lifting motor M on the basis of the rotational speed, the control signal then being output to the lifting motor M.
  • the number of revolutions of the spindle can be arithmetically determined on the basis of the detected rotational speed of the tape pulley shaft 16. Alternatively, the number of revolutions of the spindle may be arithmetically determined on the basis of the detected rotational speed of a front roller.
  • the CPU 32 is programmed to generate a command signal for the speed change control unit 29 on the basis of the operating conditions input through the input device 35 and the output signals of the rotary encoders 22 and 30 to thereby control the lifting motor M by way of the speed change control unit 29.
  • the speed change control unit 29 rotationally drives the lifting motor M in the forward direction.
  • both the line shafts 2 are caused to rotate in the forward direction by way of the output shaft 19, the gears 20 and 21, the intermediate shaft 18, the worm 25, the worm wheel 24, the rotatable shaft 23 and the bevel gears 26 and 27.
  • the driving gear 3 and the bevel gear 4 are also caused to rotate in the forward direction.
  • the nut members 8 and 13 are brought into rotation.
  • the poker pillars 6 and 12 are caused to move upwardly together with the ring rail 5 and the lappet holding angle bar 11, respectively.
  • the lift quantity or stroke of the ring rail 5 is detected by the rotary encoder 22 mounted on the intermediate shaft 18, whereby a pulse signal corresponding to the lift quantity or stroke is input to the control unit 28.
  • the relationship between the lift quantity or stroke and the pulse number is determined on the basis of the number of revolutions of the intermediate shaft 18, speed reduction ratios in the transmission paths extending from the intermediate shaft 18 to the screw portions 6a and 12a, respectively, and the number of pulses generated by the rotary encoder 22 during a period corresponding to one complete rotation.
  • the control unit 28 sets up a pulse number NF which corresponds to a single chase length or stroke which is determined arithmetically, and stored, on the basis of the single lift quantity or stroke (chase stroke) C input into the work memory prior to operation (steps 1 and 2), and then sets up a pulse number NR corresponding to a stored value (C - F) determined on the basis of the value of the take-up amount F for every chase (steps 3 and 4).
  • the control unit 28 controls the driving operation of the lifting motor M in accordance with a processing procedure illustrated in the flow chart of Fig. 7.
  • the control unit 28 Upon starting the spinning machine, the control unit 28 counts the number of pulses output from the rotary encoder 22 (step 5) and determines whether or not the ring rail 5 is moving upwardly, i.e., whether or not the lifting motor M is rotating in the forward direction (step 6). Further, the control unit 28 constantly compares the detected pulse number and the preset pulse number NF with each other (step 7). In the state where the lifting motor M is rotating forwardly (i.e., when step 6 is "YES"), the control unit 28 issues a reverse rotation command to the speed change control unit 29 (step 8) at a point in time when the accumulated value N of the detected pulses becomes equal to the preset pulse number NF (i.e., when step 7 is "YES").
  • the speed change control unit 29 reverses the rotational direction of the lifting motor M.
  • the line shaft 2 is caused to rotate in the reverse direction, and the poker pillars 6 and 12 are moved downwardly together with the ring rail 5 and the lappet holding angle bar 11, respectively.
  • the control unit 28 restarts counting the number of detection pulses output from the rotary encoder 22 at a point in time when the reverse rotation command is issued to the speed change control unit 29 (step 5). Since the lifting motor M has already been driven in the reverse direction (when step 6 is "NO"), the accumulated value of the detection pulses is compared with the preset pulse NR (step 9). The control unit 28 reissues the reverse rotation command to the speed change control unit 29 (step 10) at a point in time when the accumulated value N becomes equal to the preset pulse number NR (i.e., when step 9 is "YES"). In response to the reverse rotation command, the speed change control unit 29 drives the lifting motor M in the forward direction, whereby the ring rail 5 is lifted (moved upwards) again.
  • the ring rail 5 and the lappet holding angle bar 11 are caused to move upwardly gradually or stepwise while repetitively undergoing upward/downward movement in unison with the poker pillars 6 and 12, whereby a cop winding (filling winding) is performed to form the cop.
  • the present invention will be described in detail in conjunction with changing the rove bobbin in the ring twisting or spinning frame.
  • the spinning speed or rove delivering speed
  • a knot formed upon rove tying after changing the rove will become untied or loosened under the action of a centrifugal force applied upon whirling of the knot, leading to a failure of the rove change.
  • the spinning speed or rove delivering speed
  • the spinning speed has to be lowered to about 70 % of the normal speed.
  • the spinning speed of all the spindles in the machine frame for which the rove bobbin has to be changed are concurrently lowered, whereupon the rove bobbin is changed manually or with the aid of a rove bobbin exchanging machine on a spindle-by-spindle basis.
  • the cop having the swelled portion on its outer peripheral surface as mentioned above is likely to be brought into frictional contact with the inner surface of the ring, resulting in formation of a bar-like flaw or abrasion in the outer surface of the cop. Needless to say, a cop having such an abrasion has to be eliminated as a defective one.
  • the step length is set to a greater value than the step length in ordinary take-up while keeping the chase stroke and the chase speed constant, as indicated by a solid-line pattern in Fig. 1A. Consequently, the yarn is taken up over a wider range of the cop, preventing the cop diameter from increasing locally.
  • the step length in ordinary rove take-up differs depending on the thickness of the yarn.
  • the step length is set within a range of 40 to 50 mm.
  • the change of the step length which occurs in carrying out the cop forming method according to the instant embodiment of the invention is at most on the order of 1 mm.
  • the partial swelling of the cop can be prevented by increasing the step length about 5 to 10 %.
  • the cop taking up the yarn from partially swelling abnormally. That is, the so-called abrasion phenomena due to the swelling of the cop can be prevented.
  • the yarn can be taken up to an ordinary cop diameter notwithstanding a change in the spinning speed due to the rove bobbin change during yarn take-up operation (cop forming).
  • the cop shape is optimized by increasing the step length without changing the chase speed when the spinning speed becomes lower.
  • the partial swelling of the cop can be prevented by increasing the chase speed when the spinning speed becomes lower, whereby an ordinary cop diameter can be realized.
  • the time taken for the yarn to move along the chase stroke is usually set to lie within a range of ten seconds to one minute although it depends on the type of the yarn. The magnitude of the time change should preferably be suppressed to 10 % or less when compared with that of the ordinary cop forming operation.
  • the present invention can equally apply when the spinning speed increases. In other words, when the spinning speed becomes higher, the step length or the chase speed or both can be decreased to prevent the cop from partially swelling.
  • the spinning speed is increased to an ordinary speed from the start of the cop winding, whereon the cop is formed at an ordinary constant spinning speed, and the spinning speed is decreased to zero from the constant speed upon completion of the cop forming.
  • the teachings of the invention can equally be applied when the spinning speed is to be changed during ordinary cop winding.
  • the cop diameter can be maintained constant by controlling the cop winding in accordance with the teachings of the present invention.
  • the yarn can be taken up such that the optimum cop shape can be realized.
  • the cop can be formed with optimum shape without suffering an abrasion or like flaw due to frictional contact with the inner surface of the ring.
  • the cop having a large diameter can be manufactured properly without creating any defective products.

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
EP19990104035 1998-04-28 1999-03-16 Method of forming cop for spinning machine Expired - Lifetime EP0953661B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP11945098A JP4013325B2 (ja) 1998-04-28 1998-04-28 紡機の管糸成形方法
JP11945098 1998-04-28

Publications (3)

Publication Number Publication Date
EP0953661A2 EP0953661A2 (en) 1999-11-03
EP0953661A3 EP0953661A3 (en) 1999-12-22
EP0953661B1 true EP0953661B1 (en) 2001-08-08

Family

ID=14761700

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19990104035 Expired - Lifetime EP0953661B1 (en) 1998-04-28 1999-03-16 Method of forming cop for spinning machine

Country Status (3)

Country Link
EP (1) EP0953661B1 (enrdf_load_stackoverflow)
JP (1) JP4013325B2 (enrdf_load_stackoverflow)
DE (1) DE69900208T2 (enrdf_load_stackoverflow)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3775061B2 (ja) * 1998-07-01 2006-05-17 株式会社豊田自動織機 紡機のリングレール昇降制御装置
DE10236100A1 (de) * 2002-08-02 2004-02-19 Maschinenfabrik Rieter Ag Spinnmaschine mit einer Steuereinheit für fadenführende Teile
JP4635958B2 (ja) * 2006-05-12 2011-02-23 株式会社豊田自動織機 紡機における管糸形成方法
CN102021687B (zh) * 2010-11-16 2012-11-14 江苏新芳纺织集团有限公司 细纱机钢领板驱动装置
ES2757301A1 (es) * 2019-06-20 2020-04-28 Twistperfect S L Procedimiento para establecer la altura optima de trabajo entre el punto de entrada y el punto de salida del hilo en una maquina retorcedora y/o hiladora de hilo, y maquina retorcedora y/o hiladora de hilo que aplica dicho procedimiento

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2141516A1 (en) * 1971-06-03 1973-01-26 Socitex Yarn winding machine - for producing bi-conical packages on cops
DE3912592A1 (de) * 1989-04-17 1990-10-18 Zinser Textilmaschinen Gmbh Verfahren zum betreiben einer spinnmaschine und spinnmaschine zum durchfuehren des verfahrens
TW426048U (en) * 1994-03-17 2001-03-11 Toyoda Automatic Loom Works Lift device of yarn guide rail in the spinning machine

Also Published As

Publication number Publication date
EP0953661A3 (en) 1999-12-22
EP0953661A2 (en) 1999-11-03
JP4013325B2 (ja) 2007-11-28
DE69900208D1 (de) 2001-09-13
DE69900208T2 (de) 2002-05-08
JPH11315422A (ja) 1999-11-16

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