EP2075359A2 - Yarn slack eliminating device and spinning machine - Google Patents
Yarn slack eliminating device and spinning machine Download PDFInfo
- Publication number
- EP2075359A2 EP2075359A2 EP08020198A EP08020198A EP2075359A2 EP 2075359 A2 EP2075359 A2 EP 2075359A2 EP 08020198 A EP08020198 A EP 08020198A EP 08020198 A EP08020198 A EP 08020198A EP 2075359 A2 EP2075359 A2 EP 2075359A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- yarn
- slack eliminating
- resistance torque
- control section
- spinning
- 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.)
- Granted
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Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
- D01H4/48—Piecing arrangements; Control therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H51/00—Forwarding filamentary material
- B65H51/20—Devices for temporarily storing filamentary material during forwarding, e.g. for buffer storage
- B65H51/22—Reels or cages, e.g. cylindrical, with storing and forwarding surfaces provided by rollers or bars
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H13/00—Other common constructional features, details or accessories
- D01H13/10—Tension devices
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H13/00—Other common constructional features, details or accessories
- D01H13/10—Tension devices
- D01H13/104—Regulating tension by devices acting on running yarn and not associated with supply or take-up devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/30—Handled filamentary material
- B65H2701/31—Textiles threads or artificial strands of filaments
Definitions
- the present invention relates to a yarn slack eliminating device for a spinning machine which eliminates a possible yarn slack during a period from the spinning out of a spun yarn until the yarn is wound into a package.
- the present invention also relates to a spinning machine including the yarn slack eliminating device.
- a conventional high-speed spinning machine such as a pneumatic spinning machine which winds a spun yarn to form a package is configured to, upon detecting a yarn defect, cut and remove the yarn defect portion using a cutter, and to use a splicing device to splice a leading end of a yarn continuously fed from a spinning device and a yarn end on the package side.
- the yarn splicing operation is performed with yarn winding stopped.
- the Unexamined Japanese Patent Application Publication (Tokkai) No. 2006-306588 discloses a yarn slack eliminating device including a yarn slack eliminating roller that is rotationally driven and a rotary yarn hooking member.
- the yarn hooking member is concentrically attached to the yarn slack eliminating roller so as to be rotatable relative to the yarn slack eliminating roller.
- a resistance of an appropriate magnitude can be applied to the relative rotation using a combination of a permanent magnet and a hysteresis member.
- the relative-rotation resistance force (resistance torque) applied to the yarn hooking member is a factor determining the winding tension of a yarn. If an appropriate tension fails to be applied to the yarn being wound, yarn breakage may occur, the resulting package may be unacceptable, or yarn unwindability may be affected during a post-process. Thus, the control of the resistance torque applied to the yarn hooking member is very important.
- the appropriate tension depends on a yarn type and a yarn thickness. Furthermore, even during yarn winding, the tension varies constantly depending on the varying winding diameter of the package or a yarn traverse position. For example, during yarn splicing or the like, a high tension may be instantaneously applied to the yarn. In this case, if the resistance torque applied to the yarn hooking member fails to be appropriately set, a problem such as yarn breakage may occur as described above.
- the resistance torque can be varied steplessly by varying an area of an overlapping part of the hysteresis material and the permanent magnet.
- the yarn slack eliminating device can deal with various yarn types and yarn thicknesses.
- the yarn slack eliminating device of each of the units needs to be adjusted separately. This requires much time and effort.
- the configuration of the yarn slack eliminating device disclosed in the Unexamined Japanese Patent Application Publication (Tokkai) No. 2006-306588 fails to allow the resistance torque to be finely adjusted or positively varied during yarn winding.
- An object of the present invention is to provide a yarn slack eliminating device that enables the tension applied to the yarn to be controlled while the spinning machine is in operation.
- a first aspect of the present invention provides a yarn slack eliminating device provided in a spinning machine and configured as follows. That is, the yarn slack eliminating device includes a driving source, a yarn slack eliminating roller, a yarn hooking member, an electromagnet, and a control section.
- the yarn slack eliminating roller is rotationally driven by the driving source.
- the yarn hooking member is concentrically attached to the yarn slack eliminating roller so as to be rotatable relative to the yarn slack eliminating roller.
- the electromagnet generates a magnetic field to be applied to the yarn hooking member.
- the control section controls the magnetic field to generate a resistance torque resisting the rotation of the yarn hooking member relative to the yarn slack eliminating roller.
- the control section controls an input to the electromagnet to control the resistance torque.
- the control section can control the resistance torque while the spinning machine is in operation.
- the resistance torque can be varied even while the spinning machine is performing a spinning operation. Consequently, control can be performed such that an appropriate tension is applied to a yarn.
- control section controls the resistance torque according to a yarn winding diameter.
- control section preferably performs control such that the resistance torque is set to be higher when the yarn winding diameter is small than when the yarn winding diameter is large.
- the quality of the package can further be improved.
- control section preferably performs control such that when the spinning machine starts a spinning operation, the resistance torque is reduced before the yarn is hooked on the yarn hooking member.
- the yarn can be prevented from being broken by a possible excessive tension instantaneously applied to the yarn.
- control section preferably performs control such that the resistance torque is increased after an elapse of a predetermined period of time from the start of the spinning operation.
- control section can determine that the yarn has been wound around the yarn slack eliminating roller to appropriately adjust the resistance torque.
- control section preferably performs control such that at the start of the spinning operation during a yarn splicing operation, the resistance torque is reduced before the yarn is hooked on the yarn hooking member.
- the resistance torque can be appropriately controlled so as to prevent an excessive tension from being applied during yarn splicing, in which yarn breakage is likely to occur.
- control section preferably controls the resistance torque in conjunction with traverse of the yarn.
- an appropriate tension can be applied to the yarn according to a traverse position, allowing a package with a preferred shape to be formed.
- control section performs control such that in case of forming a cone winding package, the resistance torque is reduced when the yarn is wound on a larger diameter side of the package, and the resistance torque is increased when the yarn is wound on a smaller diameter side of the package.
- a second aspect of the present invention provides a spinning machine including the above-described yarn slack eliminating device.
- upstream and downstream mean an upstream side and a downstream side, respectively, in a direction in which a yarn travels during spinning.
- a spinning machine 1 shown in Figure 1 includes a large number of spinning units 2 arranged in a line.
- the spinning machine 1 includes a yarn splicing vehicle 3, a blower box 4, and a motor box 5.
- the yarn splicing vehicle 3 can travel in a direction in which the spinning units 2 are arranged.
- each of the spinning units 2 includes, as main components, a draft device 7, a spinning device 9, a yarn feeding device 11, a yarn slack eliminating device 12, and a winding device 13 arranged in this order from upstream to downstream.
- the draft device 7 is provided in the vicinity of an upper end of a housing 6 of the spinning machine 1.
- a fiber bundle 8 fed from the draft device 7 is spun by the spinning device 9.
- a spun yarn 10 discharged from the spinning device 9 is fed by the yarn feeding device 11.
- the spun yarn 10 passes through a yarn clearer 52 described below and is then wound by the winding device 13. Accordingly, a package 45 is formed.
- the draft device 7 drafts a sliver 15 into a fiber bundle 8.
- the draft device 7 includes four rollers, that is, a back roller 16, a third roller 17, a middle roller 19, and a front roller 20.
- the middle roller 19 is provided with an apron belt 18.
- the configuration of the spinning device 9 is not illustrated in detail.
- the spinning device 9 of the present embodiment adopts a pneumatic type that utilizes a whirling air stream to generate the spun yarn 10 from the fiber bundle 8.
- the yarn feeding device 11 includes a delivery roller 39 and a nip roller 40.
- the delivery roller 39 is supported by the housing 6 of the spinning machine 1.
- the nip roller 40 is provided in contact with the delivery roller 39.
- the yarn feeding device 11 rotationally drives the delivery roller 39 using an electric motor (not shown in the drawings), with the spun yarn 10 discharged from the spinning device 9 sandwiched between the delivery roller 39 and the nip roller 40.
- the yarn feeding device 11 thus feeds the spun yarn 10 toward the winding device 13 side.
- the winding device 13 includes a cradle arm 71 swingably supported around a support shaft 70.
- the cradle arm 71 can rotatably support a bobbin around which the spun yarn 10 is wound.
- the winding device 13 further includes a winding drum 72 and a traverse device 75.
- the winding drum 72 is configured to make contact with and drive the bobbin or an outer peripheral surface of the package 45 formed by winding the spun yarn 10 around the bobbin.
- the traverse device 75 includes a traverse guide 76 that can be engaged with the spun yarn 10.
- the traverse guide 76 is fixed to a traverse rod 77 located horizontally across a plurality of the spinning units 2.
- the traverse rod 77 is reciprocated by a driving means (not illustrated in the drawings), the winding drum 72 is driven by an electric motor (not illustrated in the drawings). Accordingly, the package 45 making contact with the winding drum 72 is rotated, and the spun yarn 10 is wound into the package 45 while being traversed.
- a yarn clearer 52 is provided at a front side of the housing 6 of the spinning machine 1 and slightly downstream of the yarn feeding device 11.
- the spun yarn 10 spun by the spinning device 9 passes through the yarn clearer 52 before being wound by the winding device 13.
- the yarn clearer 52 monitors the thickness and speed of the traveling spun yarn 10. Upon detecting a yarn defect in the spun yarn 10, the yarn clearer 52 transmits a yarn defect detection signal to a unit controller 73.
- the unit controller 73 Upon receiving the yarn defect detection signal, the unit controller 73 controls a cutter 57 to immediately cut the yarn and stops the draft device 7, the spinning device 9 and the like. Moreover, the unit controller 73 controls the yarn splicing vehicle 3 to travel to the front of the corresponding spinning unit 2. The unit controller 73 thereafter drives the spinning device 9 and the like again, and controls the yarn splicing vehicle 3 to perform splicing. Then, a spinning operation and a winding operation can be resumed.
- the yarn splicing vehicle 3 includes a splicer (splicing device) 43, a suction pipe 44, and a suction mouth 46.
- the yarn splicing vehicle 3 is provided so as to travel on a rail 41 disposed in the housing 6 of the spinning machine 1.
- the yarn splicing device 3 travels to such spinning unit 2, and is then stopped.
- the suction pipe 44 While moving pivotably upward around a shaft, the suction pipe 44 sucks and catches a yarn end discharged from the spinning device 9.
- the suction pipe 44 then moves pivotably downward around the shaft to guide the caught yarn end to the splicer 43.
- the suction mouth 46 While moving pivotably downward around a shaft, the suction mouth 46 sucks and catches a yarn end from a package 45 rotatably supported by the winding device 13. The suction mouse 46 then moves pivotably upward around the shaft to guide the caught yarn end to the splicer 43. The splicer 43 splices the guided yarn ends together.
- the yarn slack eliminating device 12 is provided in each of the plurality of spinning units 2.
- the yarn slack eliminating device 12 eliminates the slack of the spun yarn 10 between the spinning device 9 and the winding device 13 (between the spinning device 9 and the splicer 43) to apply an appropriate tension to the spun yarn 10.
- the yarn slack eliminating device 12 includes a yarn slack eliminating roller 21, a yarn hooking member 22, an upstream guide 23, an air cylinder 24, an electric motor (driving source) 25, a downstream guide 26, and an excitation coil 35.
- the yarn slack eliminating roller 21 is configured to be driven and rotated by the electric motor 25 to wind the spun yarn 10 around the outer periphery of the yarn slack eliminating roller 21 to accumulate the spun yarn 10 thereon.
- the yarn hooking member 22 is located concentrically with the yarn slack eliminating roller 21.
- the yarn hooking member 22 is configured to rotate integrally with or independently of the yarn slack eliminating roller 21 depending on conditions.
- the upstream guide 23 is located slightly upstream of the yarn slack eliminating roller 21.
- the upstream guide 23 is movable between an advanced position and a retracted position by means of the air cylinder 24.
- the downstream guide 26 is provided downstream of the yarn slack eliminating roller 21.
- the yarn slack eliminating device 12 includes a yarn slack eliminating device control section (hereinafter referred to as a control section) 74.
- the control section 74 controls a voltage applied to the excitation coil 35, expansion and contraction of the air cylinder 24, rotation of the electric motor 25, and the like.
- the upstream guide 23 When the upstream guide 23 is located at the advanced position, the yarn path of the spun yarn 10 is held by the upstream guide 23 so as to prevent the spun yarn 10 from engaging with the yarn hooking member 22. Meanwhile, when the upstream guide 23 is located at the retracted position, the yarn path is moved to a position where the spun yarn 10 engages with the yarn hooking member 22 and is wound around the yarn slack eliminating roller 21.
- the yarn slack eliminating roller 21, the upstream guide 23, the air cylinder 24, the electric motor 25, the downstream guide 26, the excitation coil 35, and the like are supported by the spinning unit 2 via a fixation member such as a bracket 27.
- the yarn slack eliminating roller 21 includes a rotation system structure 90.
- the rotation system structure 90 includes an inner magnetic pole member 29, an outer magnetic pole member 32, and a yarn slack eliminating roller main body 42.
- the inner magnetic pole member 29 is coupled to a rotating shaft 25a of the electric motor 25 via a coupling member.
- a non-magnetic member 31 is mounted on the inner magnetic pole member 29 by a mounting screw 30.
- the outer magnetic pole member 32 is coupled to the inner magnetic pole member 29 via the non-magnetic member 31.
- the yarn slack eliminating roller main body 42 is fixed to the outer magnetic pole member 32.
- the inner magnetic pole member 29, the outer magnetic pole member 32, and the yarn slack eliminating roller main body 42 are configured to be rotatable by the electric motor 25 while remaining integrated together.
- a side of the yarn slack eliminating roller main body 42 which has the yarn hooking member 22 will be referred to as a leading end, and a side thereof which is connected to the electric motor 25 will be referred to as a base end.
- an outer peripheral surface 42a of the yarn slack eliminating roller main body 42 includes a base end side taper portion 42b, a cylindrical portion 42c, and a leading end side taper portion 42d arranged in this order from the base end towards the leading end.
- the base end side taper portion 42b and the leading end side taper portion 42d are gently tapered such that an end surface side of each of the taper portions corresponds to a larger diameter side.
- the cylindrical portion 42c is shaped such that a leading end side thereof is slightly narrowed. Moreover, the cylindrical portion 42c is continuous with the taper portions 42b and 42d, with no step formed between the cylindrical portion 42c and each of the taper portions 42b and 42d.
- the yarn slack eliminating device 12 allows the yarn hooking member 22 to wind the spun yarn 10 from the spinning device 9 side, around an outer peripheral surface 42a of the yarn slack eliminating roller main body 42.
- the yarn slack eliminating device 12 allows the yarn hooking member 22 to unwind the spun yarn 10 wound and accumulated around the outer peripheral surface 42a, towards the winding device 13.
- the winding starts from the base end of the yarn slack eliminating roller main body 42.
- unwinding the spun yarn 10 from the yarn slack eliminating roller main body 42 the unwinding starts from the leading end of the yarn slack eliminating roller main body 42.
- the base end side taper portion 42b allows the supplied spun yarn 10 to move from a larger diameter portion to a smaller diameter portion of the outer peripheral surface 42a of the yarn slack eliminating roller main body 42 to reach the cylindrical portion 42c, located midway between the larger and smaller diameter portions.
- the spun yarn 10 can be orderly wound around the surface of the cylindrical portion 42c.
- the leading end side taper portion 42d has a function of preventing a slip-off phenomenon in which while the spun yarn 10 is being unwound, all of the wound spun yarn 10 slips off from the yarn slack eliminating roller main body 42 at one time.
- the leading end side taper portion 42d also has a function of progressively winding back the spun yarn 10 from the smaller diameter portion towards the larger diameter portion on the end surface side of the yarn slack eliminating roller main body 42 to allow the spun yarn 10 to be smoothly drawn out.
- An electromagnet 36 as a magnetic field forming means includes an annular excitation coil 35 fixed to the bracket 27 or the like.
- the inner magnetic pole member 29 is located inside the excitation coil 35.
- the outer magnetic pole member 32 is located outside the excitation coil 35.
- the inner magnetic pole member 29 includes an opposite portion 29a and an inner magnetic pole 29b.
- the opposite portion 29a is provided facing an inner side of the excitation coil 35.
- the inner magnetic pole 29b extends in an axial direction from the opposite portion 29a.
- the outer magnetic pole member 32 includes an opposite portion 32a and an outer magnetic pole 32b.
- the opposite portion 32a is provided facing an outer side of the excitation coil 35.
- the outer magnetic pole 32b extends in an axial direction from the opposite portion 32a.
- the inner magnetic pole 29b includes an outward projection 50 projecting outward in a radial direction.
- the outer magnetic pole 32b includes an inner projection 51 projecting inward in the radial direction.
- a plurality of (in the present embodiment, eight) the outward projections 50 are formed and arranged in a circumferential direction at equal intervals, and also a plurality of (in the present embodiment, eight) the inward projections 51 are formed and arranged in the circumferential direction at equal intervals.
- a magnetic field forming space 53 is formed between the outward projections 50 and the inward projections 51.
- the yarn hooking member 22 includes a flyer shaft 33, a flyer 38, and an annular member 37.
- the yarn hooking member 22 is configured to be rotatable independently of the rotation system structure 90 of the yarn slack eliminating roller 21.
- the flyer shaft 33 is arranged concentrically with the inner magnetic pole member 29 and is supported via bearing means 34 so as to be rotatable relative to the inner magnetic pole member 29.
- the annular member 37 made of a magnetic hysteresis material is fixed to the flyer shaft 33. The annular member 37 is inserted into the magnetic space 53.
- the flyer 38 is fixed to a tip portion 33a of the flyer shaft 33.
- the flyer 38 is shaped to be appropriately curved towards the outer peripheral surface 42a of the yarn slack eliminating roller main body 42.
- the flyer 38 can engage with the spun yarn 10 (can hook the spun yarn 10) to guide the spun yarn 10 to the outer peripheral surface of the yarn slack eliminating roller main body 42.
- the yarn slack eliminating device 12 operates as follows. That is, when the excitation coil 35 in the electromagnet 36 is energized, the inner magnetic pole member 29 and the outer magnetic pole member 32 are excited. Accordingly, a magnetic field is generated in the magnetic field forming space 53, and a force (a resistance force based on a hysteresis loss) acting to hold a phase relative to the yarn slack eliminating roller 21 acts on the annular member 37 located so as to cross the magnetic field.
- a resistance torque can be generated between the yarn slack eliminating roller 21 and the yarn hooking member 22 by the electromagnet 36, provided in the yarn slack eliminating roller 21, and the annular member 37, provided at the yarn hooking member 22 and made of the hysteresis material.
- the inner magnetic pole member 29 and the outer magnetic pole member 32 are arranged with respect to the non-rotatable excitation coil 35 so as to rotate integrally with the yarn slack eliminating roller 21.
- the excitation coil 35 when the excitation coil 35 is energized, the magnetic field rotates with the yarn slack eliminating roller 21. Since the annular member 37 is located inside the magnetic field, a torque (resistance torque) is obtained which resists the rotation of the yarn hooking member 22 relative to the yarn slack eliminating roller 21.
- the resistance torque varies depending on the magnitude of the magnetic field.
- any resistance torque can be obtained by adjusting a voltage or current applied to the excitation coil 35.
- the resistance torque can be appropriately varied by varying the voltage or the like applied to the excitation coil 35.
- Each of the spinning units 2 of the spinning machine 1 allows the draft device 7 to feed the fiber bundle 8 to the spinning device 9.
- the spun yarn 10 spun and generated by the spinning device 9 is fed to the downstream side by the yarn feeding device 11, and passes through the cutter 57 and the yarn clearer 52.
- the spun yarn 10 is finally fed, via the yarn slack eliminating device 12, to the winding device 13, where the spun yarn 10 is wound into the package 45.
- the unit controller 73 of such spinning unit 2 cuts the spun yarn 10 using the cutter 57. Simultaneously with the cutting of the spun yarn 10 with the cutter 57, the unit controller 73 stops the rotation of the back roller 16 and the third roller 17 of the draft device 7. The fiber bundle 8 is tearingly cut between the stopped third roller 17 and the continuously rotating middle roller 19. A part of the spun yarn 10 located downstream of the cut portion is sucked and removed by a suction means (not shown in the drawings).
- the unit controller 73 of the spinning unit 2 transmits a yarn splicing request signal to the yarn splicing vehicle 3.
- the yarn splicing vehicle 3 moves to and stops at a position where the yarn splicing vehicle 3 faces the spinning unit 2.
- the unit controller 73 sends a signal to the control section 74 at an appropriate timing, to start rotating the yarn slack eliminating roller 21 of the yarn slack eliminating device 12.
- the unit controller 73 controls the air cylinder 24 to advance the upstream guide 23 of the yarn slack eliminating device 12.
- the upstream guide 23 thus holds the yarn path such that the spun yarn 10 to be spun next does not engage with the yarn hooking member 22 of the yarn slack eliminating device 12 other than when required.
- control section 74 performs control such that the voltage applied to the excitation coil 35 of the yarn slack eliminating device 12 is changed to a predetermined value so as to sufficiently reduce the resistance torque exerted on the yarn hooking member 22. That is, at an instant when the flyer 38 of the yarn slack eliminating device 12 catches and engages with the spun yarn 10, a tension higher than usual is applied to the spun yarn 10, which is thus likely to be broken.
- the control section 74 performs control such that the resistance torque applied to the yarn hooking member 22 is reduced before the flyer 38 engages with the spun yarn 10. Consequently, possible yarn breakage can be prevented, allowing operating efficiently to be improved.
- the air cylinder 24 in the yarn slack eliminating device 12 contracts and retracts to move the upstream guide 23 to the retracted position. Then, the yarn path of the spun yarn 10 is changed so as to overlap the rotational track of the flyer 38. As a result, the spun yarn 10 engages with the flyer 38, which rotates to wind the spun yarn 10 around the outer peripheral surface 42a of the yarn slack eliminating roller 21.
- the spun yarn 10 continues to be spun by the spinning device 9 even during the yarn splicing operation of the splicer 43.
- a large amount of spun yarn 10 may be accumulated on the upstream side of the splicer 43.
- the yarn slack eliminating device 12 winds the spun yarn 10 around the yarn slack eliminating roller 21 to prevent the spun yarn 10 from being slackened or accumulated.
- the yarn splicing operation and a spinning resuming operation can be smoothly carried out.
- the resistance torque applied to the yarn hooking member 22 in this case is set to be low enough to prevent possible yarn breakage.
- the spun yarn 10 is prevented from being subjected to an excessive tension at an instant when the flyer 38 engages with the spun yarn 10. Consequently, the spun yarn 10 can be wound around the yarn slack eliminating roller 21 without being broken.
- control section 74 performs control such that the voltage applied to the excitation coil 35 of the yarn slack eliminating device 12 is changed to a predetermined value so that the yarn hooking member 22 is subjected to a resistance torque of an appropriate magnitude.
- the resistance torque applied to the yarn hooking member 22 is reduced when the driving of the spinning device 9 is resumed. This is to reduce a possible impact at an instant when the flyer 38 engages with the spun yarn 10. Consequently, after the spun yarn 10 starts to be wound around the yarn slack eliminating roller 21, the resistance torque needs to be recovered in order to apply an appropriate tension to the spun yarn 10.
- a sensor is not provided for sensing that the spun yarn 10 has been wound around the yarn slack eliminating roller 21.
- a determination is made that the spun yarn 10 has started to be wound around the yarn slack eliminating roller 21, and then an appropriate tension is applied to the spun yarn 10.
- the series of resistance torque control operations enable a reduction in the likelihood of yarn breakage in the yarn slack eliminating device 12.
- the yarn clearer 52 of one of the spinning units 2 detects a yarn defect, causing the spun yarn 10 to be cut with the cutter 57. Then, the unit controller 73 once stops a spinning performed by the spinning device 9. Although not shown in the drawings, the unit controller 73 also sends a control signal to the winding device 13 to allow the winding device 13 to immediately stop the rotation of the package 45.
- the unit controller 73 immediately sends a signal to the control section 74 to allow the control section 74 to stop the electric motor 25 for the yarn slack eliminating device 12. As a result, the rotation of the yarn slack eliminating device 21 and the flyer 38 is stopped. At the same time, the control section 74 controls the electromagnet 36 such that the resistance torque applied to the yarn hooking member 22 becomes zero. Thus, energy saving can be achieved.
- the unit controller 73 sends a predetermined signal to the yarn splicing vehicle 3, which thus travels to the spinning unit 2 in which the yarn has been cut. Thereafter, the unit controller 73 controls the splicer 43 to start the yarn splicing operation.
- the splicer 43 starts the yarn splicing operation.
- the unit controller 73 sends a signal to the control section 74 of the yarn slack eliminating device 12 at almost the same timing (t2) as that of the start of the yarn splicing operation.
- the control section 74 starts rotating the yarn slack eliminating roller 21, while controlling the electromagnet 36 so as to reduce the resistance torque applied to the yarn hooking member 22 to prevent the spun yarn 10 from being broken.
- the unit controller 73 performs control such that the output of the spun yarn 10 by the spinning device 9 is resumed at a timing (t3) shortly after the start of the yarn splicing operation by the splicer 43.
- the yarn splicing vehicle 3 uses the suction pipe 44 to catch the spun yarn 10 spun by the spinning device 9, and at a timing (t4), the yarn splicing vehicle 3 guides the spun yarn 10 to the splicer 43.
- the air cylinder 24 is contracted and retracted at almost the same timing (t5) as when the spun yarn 10 is transferred from the suction pipe 44 to the splicer 43.
- the unit controller 73 then sends a signal to the control section 74 to allow the control section 74 to perform control such that the resistance torque of the flyer 38 is set back to a normal value at a timing (t6), that is, a predetermined time after the spinning start timing (t3), described above.
- a period of time (time TM1 shown in Figure 6 ) from the catching of the spun yarn 10 by the flyer 38 until the resistance torque is recovered is desirably short.
- the flyer 38 and the flyer shaft 33 are rotatable independently of the yarn slack eliminating roller 21.
- the flyer 38 rotates integrally with the yarn slack eliminating roller 21 unless a mechanism composed of the electromagnet 36 and the annular member 37 imposes a load of at least a predetermined magnitude on the flyer 38.
- the traveling of the downstream side spun yarn 10 is stopped, thus reducing the load imposed on the flyer 38. Therefore, the flyer 38 rotates integrally with the yarn slack eliminating roller 21 to wind the spun yarn 10 around the outer peripheral surface 42a of the yarn slack eliminating roller 21.
- the winding device 13 allows the winding drum 72 to rotate the package 45 to resume winding of the spun yarn 10.
- the spun yarn 10 spun by the spinning device 9 is wound around the outer peripheral surface 42a of the continuously rotating yarn slack eliminating roller 21 from the start of the yarn splicing operation by the splicer 43 until the winding operation is resumed.
- a yarn speed at which the spun yarn 10 is drawn out from the yarn slack eliminating roller 21 is higher than that at which the spun yarn 10 is wound around the yarn slack eliminating roller 21.
- the ratio of a feed-out speed of the yarn feeding device 11 to a winding speed of the winding device 13 is set so as to apply an appropriate tension to the spun yarn 10. Consequently, the flyer 38 of the yarn slack eliminating device 12 rotates independently of the yarn slack eliminating roller 21 rotating continuously in a winding direction. The spun yarn 10 accumulated on the yarn slack eliminating roller 21 is thus gradually unwound.
- the flyer 38 prevents the possible slip-off of the spun yarn 10 and guides the spun yarn 10 so that the spun yarn 10 is averagely unwound from the yarn slack eliminating roller 21. Moreover, the flyer 38 contacts with the spun yarn 10 to apply an appropriate resistance to the spun yarn 10. Thus, an appropriate tension is applied to the spun yarn 10, which is then suitably wound into the package 45.
- the flyer 38 has a yarn hooking function and an unwinding tension applying function.
- the yarn hooking function is a function by which the flyer 38 introduces the spun yarn 10 onto the yarn slack eliminating roller 21 immediately before the start of the splicing operation by the splicer 43.
- the unwinding tension applying function is a function by which the flyer 38 applies a predetermined unwinding tension when the spun yarn 10 wound around the yarn slack eliminating device 21 is unwound.
- the yarn slack eliminating device 12 can appropriately control the resistance torque applied to the yarn hooking member 22 to wind the spun yarn 10 around the yarn slack eliminating roller 21 without causing yarn breakage.
- the yarn slack eliminating device 12 is more positively utilized as a device controlling the tension applied to the spun yarn 10.
- the yarn slack eliminating device 12 performs control such that the yarn tension is constantly varied during any periods of time including the period of the yarn splicing operation, thus further improving the package quality.
- control section 74 performs control such that the voltage applied to the excitation coil 35 of the yarn slack eliminating device 12 is appropriately varied depending on the winding diameter of the package 45 so as to apply an optimum resistance torque to the yarn hooking member 22.
- the optimum yarn tension depends on the winding diameter of the package 45.
- the yarn tension is always controlled in order to form an optimum package 45.
- the spun yarn 10 is wound loosely in an inner diameter portion of the package 45 and tightly in an outer diameter portion thereof.
- the spun yarn 10 in the inner diameter portion of the package 45 is pressed by the spun yarn 10 in the outer diameter portion and sticks out from the end surface of the package 45 (bulge winding).
- the present embodiment is configured as follows. First, the control section 74 monitors a yarn speed signal from the yarn clearer 52 during a spinning operation and measures an elapsed time for yarn winding. Then, the control section 74 roughly calculates the length of the spun yarn 10 wound into the package 45 in accordance with the yarn speed and the elapsed time. The control section 74 calculates the winding diameter of the package 45 in accordance with the yarn length obtained, and the control section 74 then performs control such that a predetermined resistance torque is applied to the yarn hooking member 22 according to the winding diameter. Specifically, the control section 74 performs control such that the resistance torque at the start of the yarn winding is lower than that when the yarn winding diameter is increased.
- control section 74 can perform control such that the voltage applied to the excitation coil 35 of the yarn slack eliminating device 12 is appropriately varied in conjunction with the traverse position of the spun yarn 10 so as to optimize the resistance torque applied to the yarn hooking member 22.
- the control section 74 performs control such that the predetermined resistance torque is applied to the yarn hooking member 22.
- the control section 74 determines the traverse position to perform control such that a predetermined resistance torque is applied to the yarn hooking member 22 according to the traverse position.
- control section 74 performs control such that the resistance torque is increased when the spun yarn 10 is traversed to the smaller diameter side, and is reduced when the spun yarn 10 is traversed to the larger diameter side.
- the yarn slack eliminating device 12 can absorb a possible variation in yarn tension resulting from the traversing. As a result, a high-quality package 45 can be formed.
- the yarn slack eliminating device 12 includes the electric motor 25, the yarn slack eliminating roller 21, the yarn hooking member 22, the electromagnet 36, and the control section 74.
- the yarn slack eliminating roller 21 is rotationally driven by the electric motor 25.
- the yarn hooking member 22 is concentrically attached to the yarn slack eliminating roller 21 so as to be rotatable relative to the yarn slack eliminating roller 21.
- the electromagnet 36 generates a magnetic field to be applied to the yarn hooking member 22.
- the control section 74 allows the magnetic field to generate the resistance torque resisting the rotation of the yarn hooking member 22 relative to the yarn slack eliminating roller 21.
- the control section 74 controls the input to the electromagnet 36 to control the resistance torque.
- the control section 74 can control the resistance torque while the spinning machine 1 is in operation.
- the resistance torque can be varied even while the spinning machine 1 is performing a spinning operation. Consequently, control can be performed such that an appropriate tension is applied to the spun yarn 10. Furthermore, the resistance torque can be controlled in real time, allowing control to be performed such that an optimum yarn tension is applied to the spun yarn 10 according to spinning conditions.
- control section 74 controls the resistance torque according to the yarn winding diameter.
- the yarn tension can be varied according to the yarn winding diameter, allowing the quality of the package 45 to be improved.
- the control section 74 performs control such that the resistance torque is set to be higher when the yarn winding diameter is small than when the yarn winding diameter is large.
- control section 74 performs control such that when the spinning machine 1 starts spinning, the resistance torque is reduced before the spun yarn 10 is hooked on the yarn hooking member 22.
- control section 74 performs control such that the resistance torque is increased at the timing (t6) corresponding to a predetermined period of time after the start of the spinning operation (timing t3).
- a determination can be made that the spun yarn 10 has been wound around the yarn slack eliminating roller 21, and the resistance torque can be set back to an appropriate value.
- control section 74 performs control such that at the start of the spinning following yarn splicing, the resistance torque is reduced before the spun yarn 10 is hooked on the yarn hooking member 22.
- the resistance torque can be appropriately controlled so as to prevent an excessive tension from being applied during yarn splicing, in which yarn breakage is likely to occur.
- control section 74 controls the resistance torque in conjunction with traverse of the spun yarn 10.
- the variation in tension resulting from the traversing of the spun yarn 10 can be absorbed by the yarn slack eliminating device 12. Consequently, an appropriate tension can be applied to the spun yarn 10 according to the traverse position. Therefore, the package 45 with preferred quality can be formed.
- control section 74 performs control such that in case of winding a cone package, the resistance torque is reduced when the spun yarn 10 is wound around the larger diameter side of the package 45, and the resistance torque is increased when the spun yarn 10 is wound on the smaller diameter side of the package 45.
- a control is performed such that, during yarn splicing operation, the resistance torque applied to the yarn hooking member 22 becomes zero at the timing t1, shown in Figure 6 .
- the resistance torque may have any value at the timing (t1). For example, as shown by an alternate long and two short dashes line in Figure 6 , the resistance torque may avoid being changed until the timing (t2). This simplifies the control of the resistance torque.
- the control section 74 may be provided inside in the yarn slack eliminating device 12 or provided on the spinning unit 2 side. If the control section 74 is provided on the spinning unit 2 side, the control section 74 may be configured as a part of the function of the unit controller 73.
- an arrangement may be provided which detects the yarn winding diameter using a dedicated winding diameter sensor provided in the spinning unit 2.
- the timing at which the resistance torque is recovered may be such that the recovery is performed after an elapse of a predetermined period of time from the start of a spinning operation or after an elapse of a predetermined period of time from when the upstream guide 23 has moved to the retracted position and the spun yarn 10 can be engaged with the flyer 38.
- the package quality can be improved by controlling the resistance torque according to the yarn traverse position.
- the yarn tension increases when the yarn is traversed towards the package end than when the yarn is traversed in a central portion of the width of the package.
- a package with a uniform winding tension can be formed by reducing the resistance torque when the traverse position is located at one of the opposite ends of the package width, while increasing the resistance torque when the traverse position is located in the central portion of the package width.
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Spinning Or Twisting Of Yarns (AREA)
- Tension Adjustment In Filamentary Materials (AREA)
- Forwarding And Storing Of Filamentary Material (AREA)
Abstract
Description
- The present invention relates to a yarn slack eliminating device for a spinning machine which eliminates a possible yarn slack during a period from the spinning out of a spun yarn until the yarn is wound into a package. The present invention also relates to a spinning machine including the yarn slack eliminating device.
- A conventional high-speed spinning machine such as a pneumatic spinning machine which winds a spun yarn to form a package is configured to, upon detecting a yarn defect, cut and remove the yarn defect portion using a cutter, and to use a splicing device to splice a leading end of a yarn continuously fed from a spinning device and a yarn end on the package side. The yarn splicing operation is performed with yarn winding stopped. Thus, a possible yarn slack needs to be eliminated.
- In view of this, the Unexamined Japanese Patent Application Publication (Tokkai) No.
2006-306588 - With this configuration, the relative-rotation resistance force (resistance torque) applied to the yarn hooking member is a factor determining the winding tension of a yarn. If an appropriate tension fails to be applied to the yarn being wound, yarn breakage may occur, the resulting package may be unacceptable, or yarn unwindability may be affected during a post-process. Thus, the control of the resistance torque applied to the yarn hooking member is very important.
- Meanwhile, the appropriate tension depends on a yarn type and a yarn thickness. Furthermore, even during yarn winding, the tension varies constantly depending on the varying winding diameter of the package or a yarn traverse position. For example, during yarn splicing or the like, a high tension may be instantaneously applied to the yarn. In this case, if the resistance torque applied to the yarn hooking member fails to be appropriately set, a problem such as yarn breakage may occur as described above.
- In this connection, with the configuration of the yarn slack eliminating device disclosed in the Unexamined Japanese Patent Application Publication (Tokkai) No.
2006-306588 2006-306588 - The present invention has been made in view of the above-described circumstances. An object of the present invention is to provide a yarn slack eliminating device that enables the tension applied to the yarn to be controlled while the spinning machine is in operation.
- A first aspect of the present invention provides a yarn slack eliminating device provided in a spinning machine and configured as follows. That is, the yarn slack eliminating device includes a driving source, a yarn slack eliminating roller, a yarn hooking member, an electromagnet, and a control section. The yarn slack eliminating roller is rotationally driven by the driving source. The yarn hooking member is concentrically attached to the yarn slack eliminating roller so as to be rotatable relative to the yarn slack eliminating roller. The electromagnet generates a magnetic field to be applied to the yarn hooking member.
The control section controls the magnetic field to generate a resistance torque resisting the rotation of the yarn hooking member relative to the yarn slack eliminating roller. The control section controls an input to the electromagnet to control the resistance torque. The control section can control the resistance torque while the spinning machine is in operation. - Thus, the resistance torque can be varied even while the spinning machine is performing a spinning operation. Consequently, control can be performed such that an appropriate tension is applied to a yarn.
- In the yarn slack eliminating device, the control section controls the resistance torque according to a yarn winding diameter.
- Thus, a package with preferred quality can be formed.
- In the yarn slack eliminating device, the control section preferably performs control such that the resistance torque is set to be higher when the yarn winding diameter is small than when the yarn winding diameter is large.
- Thus, the quality of the package can further be improved.
- In the yarn slack eliminating device, the control section preferably performs control such that when the spinning machine starts a spinning operation, the resistance torque is reduced before the yarn is hooked on the yarn hooking member.
- Thus, the yarn can be prevented from being broken by a possible excessive tension instantaneously applied to the yarn.
- In the yarn slack eliminating device, the control section preferably performs control such that the resistance torque is increased after an elapse of a predetermined period of time from the start of the spinning operation.
- Thus, by simple control for determining the elapse of time, the control section can determine that the yarn has been wound around the yarn slack eliminating roller to appropriately adjust the resistance torque.
- In the yarn slack eliminating device, the control section preferably performs control such that at the start of the spinning operation during a yarn splicing operation, the resistance torque is reduced before the yarn is hooked on the yarn hooking member.
- Thus, the resistance torque can be appropriately controlled so as to prevent an excessive tension from being applied during yarn splicing, in which yarn breakage is likely to occur.
- In the yarn slack eliminating device, the control section preferably controls the resistance torque in conjunction with traverse of the yarn.
- Thus, an appropriate tension can be applied to the yarn according to a traverse position, allowing a package with a preferred shape to be formed.
- In the yarn slack eliminating device, the control section performs control such that in case of forming a cone winding package, the resistance torque is reduced when the yarn is wound on a larger diameter side of the package, and the resistance torque is increased when the yarn is wound on a smaller diameter side of the package.
- Thus, an appropriate tension can be applied to the yarn, allowing a high-quality cone winding package to be formed.
- A second aspect of the present invention provides a spinning machine including the above-described yarn slack eliminating device.
- Thus, a high-quality package can be produced.
- Other features, elements, processes, steps, characteristics and advantages of the present invention will become more apparent from the following detailed description of preferred embodiments of the present invention with reference to the attached drawings.
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Figure 1 is a front view illustrating a general configuration of a spinning machine provided with a yarn slack eliminating device according to an embodiment of the present invention. -
Figure 2 is a vertical cross-sectional view of the spinning machine. -
Figure 3 is a partial cross-sectional perspective view of the yarn slack eliminating device according to an embodiment of the present invention. -
Figure 4 is a partial vertical cross-sectional view of the yarn slack eliminating device. -
Figure 5 is a cross-sectional view taken along line A-A inFigure 4 . -
Figure 6 is a timing chart showing the relationship between a yarn splicing operation and the operation of the yarn slack eliminating device. - A spinning machine according to an embodiment of the present invention will be described with reference to the drawings. In the specification, "upstream" and "downstream" mean an upstream side and a downstream side, respectively, in a direction in which a yarn travels during spinning.
- A
spinning machine 1 shown inFigure 1 includes a large number ofspinning units 2 arranged in a line. Thespinning machine 1 includes ayarn splicing vehicle 3, a blower box 4, and a motor box 5. The yarn splicingvehicle 3 can travel in a direction in which thespinning units 2 are arranged. - As shown in
Figure 1 , each of thespinning units 2 includes, as main components, adraft device 7, aspinning device 9, ayarn feeding device 11, a yarnslack eliminating device 12, and a windingdevice 13 arranged in this order from upstream to downstream. Thedraft device 7 is provided in the vicinity of an upper end of ahousing 6 of the spinningmachine 1. A fiber bundle 8 fed from thedraft device 7 is spun by thespinning device 9. A spunyarn 10 discharged from thespinning device 9 is fed by theyarn feeding device 11. The spunyarn 10 passes through ayarn clearer 52 described below and is then wound by the windingdevice 13. Accordingly, apackage 45 is formed. - The
draft device 7 drafts asliver 15 into a fiber bundle 8. As shown inFigure 2 , thedraft device 7 includes four rollers, that is, aback roller 16, athird roller 17, amiddle roller 19, and afront roller 20. Themiddle roller 19 is provided with anapron belt 18. - The configuration of the
spinning device 9 is not illustrated in detail. Thespinning device 9 of the present embodiment adopts a pneumatic type that utilizes a whirling air stream to generate the spunyarn 10 from the fiber bundle 8. - The
yarn feeding device 11 includes adelivery roller 39 and anip roller 40. Thedelivery roller 39 is supported by thehousing 6 of the spinningmachine 1. Thenip roller 40 is provided in contact with thedelivery roller 39. Theyarn feeding device 11 rotationally drives thedelivery roller 39 using an electric motor (not shown in the drawings), with the spunyarn 10 discharged from thespinning device 9 sandwiched between thedelivery roller 39 and thenip roller 40. Theyarn feeding device 11 thus feeds the spunyarn 10 toward the windingdevice 13 side. - The winding
device 13 includes acradle arm 71 swingably supported around asupport shaft 70. Thecradle arm 71 can rotatably support a bobbin around which the spunyarn 10 is wound. The windingdevice 13 further includes a windingdrum 72 and atraverse device 75. The windingdrum 72 is configured to make contact with and drive the bobbin or an outer peripheral surface of thepackage 45 formed by winding the spunyarn 10 around the bobbin. Furthermore, thetraverse device 75 includes atraverse guide 76 that can be engaged with the spunyarn 10. Thetraverse guide 76 is fixed to atraverse rod 77 located horizontally across a plurality of thespinning units 2. While thetraverse rod 77 is reciprocated by a driving means (not illustrated in the drawings), the windingdrum 72 is driven by an electric motor (not illustrated in the drawings). Accordingly, thepackage 45 making contact with the windingdrum 72 is rotated, and the spunyarn 10 is wound into thepackage 45 while being traversed. - A
yarn clearer 52 is provided at a front side of thehousing 6 of the spinningmachine 1 and slightly downstream of theyarn feeding device 11. The spunyarn 10 spun by thespinning device 9 passes through theyarn clearer 52 before being wound by the windingdevice 13. Theyarn clearer 52 monitors the thickness and speed of the traveling spunyarn 10. Upon detecting a yarn defect in the spunyarn 10, theyarn clearer 52 transmits a yarn defect detection signal to aunit controller 73. - Upon receiving the yarn defect detection signal, the
unit controller 73 controls acutter 57 to immediately cut the yarn and stops thedraft device 7, thespinning device 9 and the like. Moreover, theunit controller 73 controls theyarn splicing vehicle 3 to travel to the front of thecorresponding spinning unit 2. Theunit controller 73 thereafter drives thespinning device 9 and the like again, and controls theyarn splicing vehicle 3 to perform splicing. Then, a spinning operation and a winding operation can be resumed. - As shown in
Figures 1 and2 , theyarn splicing vehicle 3 includes a splicer (splicing device) 43, asuction pipe 44, and asuction mouth 46. Theyarn splicing vehicle 3 is provided so as to travel on arail 41 disposed in thehousing 6 of the spinningmachine 1. When yarn breakage or yarn cut occurs in acertain spinning unit 2, theyarn splicing device 3 travels tosuch spinning unit 2, and is then stopped. While moving pivotably upward around a shaft, thesuction pipe 44 sucks and catches a yarn end discharged from thespinning device 9. Thesuction pipe 44 then moves pivotably downward around the shaft to guide the caught yarn end to thesplicer 43. While moving pivotably downward around a shaft, thesuction mouth 46 sucks and catches a yarn end from apackage 45 rotatably supported by the windingdevice 13. Thesuction mouse 46 then moves pivotably upward around the shaft to guide the caught yarn end to thesplicer 43. Thesplicer 43 splices the guided yarn ends together. - The yarn
slack eliminating device 12 is provided in each of the plurality of spinningunits 2. The yarnslack eliminating device 12 eliminates the slack of the spunyarn 10 between the spinningdevice 9 and the winding device 13 (between the spinningdevice 9 and the splicer 43) to apply an appropriate tension to the spunyarn 10. - Specifically, the yarn
slack eliminating device 12 includes a yarnslack eliminating roller 21, ayarn hooking member 22, anupstream guide 23, anair cylinder 24, an electric motor (driving source) 25, adownstream guide 26, and anexcitation coil 35. The yarnslack eliminating roller 21 is configured to be driven and rotated by theelectric motor 25 to wind the spunyarn 10 around the outer periphery of the yarnslack eliminating roller 21 to accumulate the spunyarn 10 thereon. Theyarn hooking member 22 is located concentrically with the yarnslack eliminating roller 21. Theyarn hooking member 22 is configured to rotate integrally with or independently of the yarnslack eliminating roller 21 depending on conditions. Theupstream guide 23 is located slightly upstream of the yarnslack eliminating roller 21. Theupstream guide 23 is movable between an advanced position and a retracted position by means of theair cylinder 24. Thedownstream guide 26 is provided downstream of the yarnslack eliminating roller 21. - The yarn
slack eliminating device 12 includes a yarn slack eliminating device control section (hereinafter referred to as a control section) 74. Thecontrol section 74 controls a voltage applied to theexcitation coil 35, expansion and contraction of theair cylinder 24, rotation of theelectric motor 25, and the like. - When the
upstream guide 23 is located at the advanced position, the yarn path of the spunyarn 10 is held by theupstream guide 23 so as to prevent the spunyarn 10 from engaging with theyarn hooking member 22. Meanwhile, when theupstream guide 23 is located at the retracted position, the yarn path is moved to a position where the spunyarn 10 engages with theyarn hooking member 22 and is wound around the yarnslack eliminating roller 21. - The yarn
slack eliminating roller 21, theupstream guide 23, theair cylinder 24, theelectric motor 25, thedownstream guide 26, theexcitation coil 35, and the like are supported by thespinning unit 2 via a fixation member such as abracket 27. - As shown in
Figures 3 and4 , the yarnslack eliminating roller 21 includes arotation system structure 90. Therotation system structure 90 includes an innermagnetic pole member 29, an outermagnetic pole member 32, and a yarn slack eliminating rollermain body 42. The innermagnetic pole member 29 is coupled to arotating shaft 25a of theelectric motor 25 via a coupling member. Anon-magnetic member 31 is mounted on the innermagnetic pole member 29 by a mountingscrew 30. The outermagnetic pole member 32 is coupled to the innermagnetic pole member 29 via thenon-magnetic member 31. The yarn slack eliminating rollermain body 42 is fixed to the outermagnetic pole member 32. The innermagnetic pole member 29, the outermagnetic pole member 32, and the yarn slack eliminating rollermain body 42 are configured to be rotatable by theelectric motor 25 while remaining integrated together. - A side of the yarn slack eliminating roller
main body 42 which has theyarn hooking member 22 will be referred to as a leading end, and a side thereof which is connected to theelectric motor 25 will be referred to as a base end. As shown inFigure 4 , an outerperipheral surface 42a of the yarn slack eliminating rollermain body 42 includes a base endside taper portion 42b, acylindrical portion 42c, and a leading endside taper portion 42d arranged in this order from the base end towards the leading end. The base endside taper portion 42b and the leading endside taper portion 42d are gently tapered such that an end surface side of each of the taper portions corresponds to a larger diameter side. Thecylindrical portion 42c is shaped such that a leading end side thereof is slightly narrowed. Moreover, thecylindrical portion 42c is continuous with thetaper portions cylindrical portion 42c and each of thetaper portions - During a yarn splicing operation of the
yarn splicing vehicle 3, the yarnslack eliminating device 12 allows theyarn hooking member 22 to wind the spunyarn 10 from thespinning device 9 side, around an outerperipheral surface 42a of the yarn slack eliminating rollermain body 42. When the yarn splicing operation is completed, the yarnslack eliminating device 12 allows theyarn hooking member 22 to unwind the spunyarn 10 wound and accumulated around the outerperipheral surface 42a, towards the windingdevice 13. When winding the spunyarn 10 around the yarn slack eliminating rollermain body 42, the winding starts from the base end of the yarn slack eliminating rollermain body 42. When unwinding the spunyarn 10 from the yarn slack eliminating rollermain body 42, the unwinding starts from the leading end of the yarn slack eliminating rollermain body 42. - The base end
side taper portion 42b allows the supplied spunyarn 10 to move from a larger diameter portion to a smaller diameter portion of the outerperipheral surface 42a of the yarn slack eliminating rollermain body 42 to reach thecylindrical portion 42c, located midway between the larger and smaller diameter portions. Thus, the spunyarn 10 can be orderly wound around the surface of thecylindrical portion 42c. Furthermore, the leading endside taper portion 42d has a function of preventing a slip-off phenomenon in which while the spunyarn 10 is being unwound, all of the wound spunyarn 10 slips off from the yarn slack eliminating rollermain body 42 at one time. The leading endside taper portion 42d also has a function of progressively winding back the spunyarn 10 from the smaller diameter portion towards the larger diameter portion on the end surface side of the yarn slack eliminating rollermain body 42 to allow the spunyarn 10 to be smoothly drawn out. - An
electromagnet 36 as a magnetic field forming means includes anannular excitation coil 35 fixed to thebracket 27 or the like. The innermagnetic pole member 29 is located inside theexcitation coil 35. The outermagnetic pole member 32 is located outside theexcitation coil 35. - The inner
magnetic pole member 29 includes anopposite portion 29a and an innermagnetic pole 29b. Theopposite portion 29a is provided facing an inner side of theexcitation coil 35. The innermagnetic pole 29b extends in an axial direction from theopposite portion 29a. The outermagnetic pole member 32 includes anopposite portion 32a and an outermagnetic pole 32b. Theopposite portion 32a is provided facing an outer side of theexcitation coil 35. The outermagnetic pole 32b extends in an axial direction from theopposite portion 32a. - As shown in
Figure 5 as a cross-sectional view taken along line A-A inFigure 4 , the innermagnetic pole 29b includes anoutward projection 50 projecting outward in a radial direction. The outermagnetic pole 32b includes aninner projection 51 projecting inward in the radial direction. A plurality of (in the present embodiment, eight) theoutward projections 50 are formed and arranged in a circumferential direction at equal intervals, and also a plurality of (in the present embodiment, eight) theinward projections 51 are formed and arranged in the circumferential direction at equal intervals. A magneticfield forming space 53 is formed between theoutward projections 50 and theinward projections 51. - The
yarn hooking member 22 includes aflyer shaft 33, aflyer 38, and anannular member 37. Theyarn hooking member 22 is configured to be rotatable independently of therotation system structure 90 of the yarnslack eliminating roller 21. Specifically, theflyer shaft 33 is arranged concentrically with the innermagnetic pole member 29 and is supported via bearing means 34 so as to be rotatable relative to the innermagnetic pole member 29. Theannular member 37 made of a magnetic hysteresis material is fixed to theflyer shaft 33. Theannular member 37 is inserted into themagnetic space 53. - The
flyer 38 is fixed to atip portion 33a of theflyer shaft 33. Theflyer 38 is shaped to be appropriately curved towards the outerperipheral surface 42a of the yarn slack eliminating rollermain body 42. Thus, theflyer 38 can engage with the spun yarn 10 (can hook the spun yarn 10) to guide the spunyarn 10 to the outer peripheral surface of the yarn slack eliminating rollermain body 42. - The yarn
slack eliminating device 12 operates as follows. That is, when theexcitation coil 35 in theelectromagnet 36 is energized, the innermagnetic pole member 29 and the outermagnetic pole member 32 are excited. Accordingly, a magnetic field is generated in the magneticfield forming space 53, and a force (a resistance force based on a hysteresis loss) acting to hold a phase relative to the yarnslack eliminating roller 21 acts on theannular member 37 located so as to cross the magnetic field. As described above, a resistance torque can be generated between the yarnslack eliminating roller 21 and theyarn hooking member 22 by theelectromagnet 36, provided in the yarnslack eliminating roller 21, and theannular member 37, provided at theyarn hooking member 22 and made of the hysteresis material. - As shown in
Figures 3 and4 , in the present embodiment, the innermagnetic pole member 29 and the outermagnetic pole member 32 are arranged with respect to thenon-rotatable excitation coil 35 so as to rotate integrally with the yarnslack eliminating roller 21. In this state, when theexcitation coil 35 is energized, the magnetic field rotates with the yarnslack eliminating roller 21. Since theannular member 37 is located inside the magnetic field, a torque (resistance torque) is obtained which resists the rotation of theyarn hooking member 22 relative to the yarnslack eliminating roller 21. - The resistance torque varies depending on the magnitude of the magnetic field. Thus, any resistance torque can be obtained by adjusting a voltage or current applied to the
excitation coil 35. Furthermore, even during spinning (during yarn winding), the resistance torque can be appropriately varied by varying the voltage or the like applied to theexcitation coil 35. - Next, the operation of the spinning
machine 1 configured as described above will be described below. Each of thespinning units 2 of the spinningmachine 1 allows thedraft device 7 to feed the fiber bundle 8 to thespinning device 9. The spunyarn 10 spun and generated by thespinning device 9 is fed to the downstream side by theyarn feeding device 11, and passes through thecutter 57 and theyarn clearer 52. The spunyarn 10 is finally fed, via the yarnslack eliminating device 12, to the windingdevice 13, where the spunyarn 10 is wound into thepackage 45. - When the
yarn clearer 52 of acertain spinning units 2 detects a defect (yarn defect) in the spunyarn 10, theunit controller 73 ofsuch spinning unit 2 cuts the spunyarn 10 using thecutter 57. Simultaneously with the cutting of the spunyarn 10 with thecutter 57, theunit controller 73 stops the rotation of theback roller 16 and thethird roller 17 of thedraft device 7. The fiber bundle 8 is tearingly cut between the stoppedthird roller 17 and the continuously rotatingmiddle roller 19. A part of the spunyarn 10 located downstream of the cut portion is sucked and removed by a suction means (not shown in the drawings). - The
unit controller 73 of thespinning unit 2 transmits a yarn splicing request signal to theyarn splicing vehicle 3. Upon receiving the yarn splicing request signal, theyarn splicing vehicle 3 moves to and stops at a position where theyarn splicing vehicle 3 faces thespinning unit 2. Then, theunit controller 73 sends a signal to thecontrol section 74 at an appropriate timing, to start rotating the yarnslack eliminating roller 21 of the yarnslack eliminating device 12. Simultaneously with the start of rotation of the yarnslack eliminating roller 21, theunit controller 73 controls theair cylinder 24 to advance theupstream guide 23 of the yarnslack eliminating device 12. Theupstream guide 23 thus holds the yarn path such that the spunyarn 10 to be spun next does not engage with theyarn hooking member 22 of the yarnslack eliminating device 12 other than when required. - At this time, the
control section 74 performs control such that the voltage applied to theexcitation coil 35 of the yarnslack eliminating device 12 is changed to a predetermined value so as to sufficiently reduce the resistance torque exerted on theyarn hooking member 22. That is, at an instant when theflyer 38 of the yarnslack eliminating device 12 catches and engages with the spunyarn 10, a tension higher than usual is applied to the spunyarn 10, which is thus likely to be broken. In this connection, according to the present embodiment, thecontrol section 74 performs control such that the resistance torque applied to theyarn hooking member 22 is reduced before theflyer 38 engages with the spunyarn 10. Consequently, possible yarn breakage can be prevented, allowing operating efficiently to be improved. - Subsequently, when the
suction pipe 44 of theyarn splicing vehicle 3 is pivotably moved upward, driving of thedraft device 7 and thespinning device 9 is started almost in synchronism with the upward pivotable movement of thesuction pipe 44, and the spunyarn 10 spun from thespinning device 9 is sucked and caught by thesuction pipe 44. Furthermore, at the same time, on the windingdevice 13 side, thesuction mouth 46 of theyarn splicing vehicle 3 moves pivotably downward to suck and catch the yarn end wound around thepackage 45. Thesuction pipe 44 and thesuction mouth 46 guide the respective sucked yarn ends to thesplicer 43 for yarn splicing. - Immediately before the splicer 43 starts the yarn splicing operation, the
air cylinder 24 in the yarnslack eliminating device 12 contracts and retracts to move theupstream guide 23 to the retracted position. Then, the yarn path of the spunyarn 10 is changed so as to overlap the rotational track of theflyer 38. As a result, the spunyarn 10 engages with theflyer 38, which rotates to wind the spunyarn 10 around the outerperipheral surface 42a of the yarnslack eliminating roller 21. - That is, the spun
yarn 10 continues to be spun by thespinning device 9 even during the yarn splicing operation of thesplicer 43. Thus, in this state, a large amount of spunyarn 10 may be accumulated on the upstream side of thesplicer 43. However, in the spinningmachine 1 according to the present embodiment, during the yarn splicing operation of thesplicer 43, the yarnslack eliminating device 12 winds the spunyarn 10 around the yarnslack eliminating roller 21 to prevent the spunyarn 10 from being slackened or accumulated. As a result, the yarn splicing operation and a spinning resuming operation can be smoothly carried out. - Furthermore, as described above, the resistance torque applied to the
yarn hooking member 22 in this case is set to be low enough to prevent possible yarn breakage. Thus, the spunyarn 10 is prevented from being subjected to an excessive tension at an instant when theflyer 38 engages with the spunyarn 10. Consequently, the spunyarn 10 can be wound around the yarnslack eliminating roller 21 without being broken. - Then, after an elapse of a predetermined period of time from the resumption of driving of the above-described
spinning device 9, thecontrol section 74 performs control such that the voltage applied to theexcitation coil 35 of the yarnslack eliminating device 12 is changed to a predetermined value so that theyarn hooking member 22 is subjected to a resistance torque of an appropriate magnitude. - That is, the resistance torque applied to the
yarn hooking member 22 is reduced when the driving of thespinning device 9 is resumed. This is to reduce a possible impact at an instant when theflyer 38 engages with the spunyarn 10. Consequently, after the spunyarn 10 starts to be wound around the yarnslack eliminating roller 21, the resistance torque needs to be recovered in order to apply an appropriate tension to the spunyarn 10. In the present embodiment, a sensor is not provided for sensing that the spunyarn 10 has been wound around the yarnslack eliminating roller 21. However, according to the present embodiment, when a predetermined period of time elapsed after the start of spinning, a determination is made that the spunyarn 10 has started to be wound around the yarnslack eliminating roller 21, and then an appropriate tension is applied to the spunyarn 10. The series of resistance torque control operations enable a reduction in the likelihood of yarn breakage in the yarnslack eliminating device 12. - Next, timings of the above-described operations will be described with reference to
Figure 6 . - It is assumed that at a timing (t1) shown in
Figure 6 , theyarn clearer 52 of one of thespinning units 2 detects a yarn defect, causing the spunyarn 10 to be cut with thecutter 57. Then, theunit controller 73 once stops a spinning performed by thespinning device 9. Although not shown in the drawings, theunit controller 73 also sends a control signal to the windingdevice 13 to allow the windingdevice 13 to immediately stop the rotation of thepackage 45. - Moreover, the
unit controller 73 immediately sends a signal to thecontrol section 74 to allow thecontrol section 74 to stop theelectric motor 25 for the yarnslack eliminating device 12. As a result, the rotation of the yarnslack eliminating device 21 and theflyer 38 is stopped. At the same time, thecontrol section 74 controls theelectromagnet 36 such that the resistance torque applied to theyarn hooking member 22 becomes zero. Thus, energy saving can be achieved. - Then, the
unit controller 73 sends a predetermined signal to theyarn splicing vehicle 3, which thus travels to thespinning unit 2 in which the yarn has been cut. Thereafter, theunit controller 73 controls thesplicer 43 to start the yarn splicing operation. In the following description, it is assumed that at a timing (t2), thesplicer 43 starts the yarn splicing operation. Theunit controller 73 sends a signal to thecontrol section 74 of the yarnslack eliminating device 12 at almost the same timing (t2) as that of the start of the yarn splicing operation. Thecontrol section 74 starts rotating the yarnslack eliminating roller 21, while controlling theelectromagnet 36 so as to reduce the resistance torque applied to theyarn hooking member 22 to prevent the spunyarn 10 from being broken. - The
unit controller 73 performs control such that the output of the spunyarn 10 by thespinning device 9 is resumed at a timing (t3) shortly after the start of the yarn splicing operation by thesplicer 43. Theyarn splicing vehicle 3 uses thesuction pipe 44 to catch the spunyarn 10 spun by thespinning device 9, and at a timing (t4), theyarn splicing vehicle 3 guides the spunyarn 10 to thesplicer 43. - The
air cylinder 24 is contracted and retracted at almost the same timing (t5) as when the spunyarn 10 is transferred from thesuction pipe 44 to thesplicer 43. As a result, theflyer 38 engages with the spunyarn 10, and the spunyarn 10 starts to be wound around the yarnslack eliminating roller 21. Theunit controller 73 then sends a signal to thecontrol section 74 to allow thecontrol section 74 to perform control such that the resistance torque of theflyer 38 is set back to a normal value at a timing (t6), that is, a predetermined time after the spinning start timing (t3), described above. A period of time (time TM1 shown inFigure 6 ) from the catching of the spunyarn 10 by theflyer 38 until the resistance torque is recovered is desirably short. - Furthermore, as described above, the
flyer 38 and theflyer shaft 33 are rotatable independently of the yarnslack eliminating roller 21. However, theflyer 38 rotates integrally with the yarnslack eliminating roller 21 unless a mechanism composed of theelectromagnet 36 and theannular member 37 imposes a load of at least a predetermined magnitude on theflyer 38. During the above-described yarn splicing operation, the traveling of the downstream side spunyarn 10 is stopped, thus reducing the load imposed on theflyer 38. Therefore, theflyer 38 rotates integrally with the yarnslack eliminating roller 21 to wind the spunyarn 10 around the outerperipheral surface 42a of the yarnslack eliminating roller 21. - Subsequently, after the
splicer 43 completes the yarn splicing operation, the windingdevice 13 allows the windingdrum 72 to rotate thepackage 45 to resume winding of the spunyarn 10. - As described above, the spun
yarn 10 spun by thespinning device 9 is wound around the outerperipheral surface 42a of the continuously rotating yarnslack eliminating roller 21 from the start of the yarn splicing operation by thesplicer 43 until the winding operation is resumed. However, when the windingdevice 13 resumes the winding operation, a yarn speed at which the spunyarn 10 is drawn out from the yarnslack eliminating roller 21 is higher than that at which the spunyarn 10 is wound around the yarnslack eliminating roller 21. This is because the ratio of a feed-out speed of theyarn feeding device 11 to a winding speed of the windingdevice 13 is set so as to apply an appropriate tension to the spunyarn 10. Consequently, theflyer 38 of the yarnslack eliminating device 12 rotates independently of the yarnslack eliminating roller 21 rotating continuously in a winding direction. The spunyarn 10 accumulated on the yarnslack eliminating roller 21 is thus gradually unwound. - During the unwinding of the spun
yarn 10 from the yarnslack eliminating roller 21, theflyer 38 prevents the possible slip-off of the spunyarn 10 and guides the spunyarn 10 so that the spunyarn 10 is averagely unwound from the yarnslack eliminating roller 21. Moreover, theflyer 38 contacts with the spunyarn 10 to apply an appropriate resistance to the spunyarn 10. Thus, an appropriate tension is applied to the spunyarn 10, which is then suitably wound into thepackage 45. - That is, the
flyer 38 according to the present embodiment has a yarn hooking function and an unwinding tension applying function. The yarn hooking function is a function by which theflyer 38 introduces the spunyarn 10 onto the yarnslack eliminating roller 21 immediately before the start of the splicing operation by thesplicer 43. The unwinding tension applying function is a function by which theflyer 38 applies a predetermined unwinding tension when the spunyarn 10 wound around the yarnslack eliminating device 21 is unwound. - As described above, the yarn
slack eliminating device 12 according to the present embodiment can appropriately control the resistance torque applied to theyarn hooking member 22 to wind the spunyarn 10 around the yarnslack eliminating roller 21 without causing yarn breakage. However, according to the present embodiment, the yarnslack eliminating device 12 is more positively utilized as a device controlling the tension applied to the spunyarn 10. In other words, according to the present embodiment, the yarnslack eliminating device 12 performs control such that the yarn tension is constantly varied during any periods of time including the period of the yarn splicing operation, thus further improving the package quality. - A description will be given below of the control of the yarn tension performed by the yarn
slack eliminating device 12 according to the present embodiment. - That is, in the present embodiment, the
control section 74 performs control such that the voltage applied to theexcitation coil 35 of the yarnslack eliminating device 12 is appropriately varied depending on the winding diameter of thepackage 45 so as to apply an optimum resistance torque to theyarn hooking member 22. - The optimum yarn tension depends on the winding diameter of the
package 45. Preferably, the yarn tension is always controlled in order to form anoptimum package 45. For example, when continuously wound into thepackage 45 with the yarn tension not controlled, the spunyarn 10 is wound loosely in an inner diameter portion of thepackage 45 and tightly in an outer diameter portion thereof.
As a result, the spunyarn 10 in the inner diameter portion of thepackage 45 is pressed by the spunyarn 10 in the outer diameter portion and sticks out from the end surface of the package 45 (bulge winding). - To prevent the bulge winding as described above, the present embodiment is configured as follows. First, the
control section 74 monitors a yarn speed signal from theyarn clearer 52 during a spinning operation and measures an elapsed time for yarn winding. Then, thecontrol section 74 roughly calculates the length of the spunyarn 10 wound into thepackage 45 in accordance with the yarn speed and the elapsed time. Thecontrol section 74 calculates the winding diameter of thepackage 45 in accordance with the yarn length obtained, and thecontrol section 74 then performs control such that a predetermined resistance torque is applied to theyarn hooking member 22 according to the winding diameter. Specifically, thecontrol section 74 performs control such that the resistance torque at the start of the yarn winding is lower than that when the yarn winding diameter is increased. - Thus, the possible bulge winding can be prevented, allowing a
package 45 with an optimum shape to be formed. - Furthermore, in the present embodiment, the
control section 74 can perform control such that the voltage applied to theexcitation coil 35 of the yarnslack eliminating device 12 is appropriately varied in conjunction with the traverse position of the spunyarn 10 so as to optimize the resistance torque applied to theyarn hooking member 22. - For example, when winding a cone package, if the tension of the spun
yarn 10 is not controlled according to the traverse position, the spunyarn 10 is wound loosely in the smaller diameter portion and tightly in the larger diameter portion. As a result, anappropriate package 45 cannot be formed. - To solve this problem, the following configuration is possible. That is, in accordance with a signal from traverse position detecting means (not shown in the drawings), the
control section 74 performs control such that the predetermined resistance torque is applied to theyarn hooking member 22. For example, sensors arranged at the opposite ends of the reciprocating stroke of thetraverse rod 77 can be used as the traverse position detecting means. In accordance with signals from the sensors, thecontrol section 74 determines the traverse position to perform control such that a predetermined resistance torque is applied to theyarn hooking member 22 according to the traverse position. Specifically, for example, in case of winding a cone package, thecontrol section 74 performs control such that the resistance torque is increased when the spunyarn 10 is traversed to the smaller diameter side, and is reduced when the spunyarn 10 is traversed to the larger diameter side. - Thus, the yarn
slack eliminating device 12 can absorb a possible variation in yarn tension resulting from the traversing. As a result, a high-quality package 45 can be formed. - As described above, the yarn
slack eliminating device 12 according to the present embodiment includes theelectric motor 25, the yarnslack eliminating roller 21, theyarn hooking member 22, theelectromagnet 36, and thecontrol section 74. The yarnslack eliminating roller 21 is rotationally driven by theelectric motor 25. Theyarn hooking member 22 is concentrically attached to the yarnslack eliminating roller 21 so as to be rotatable relative to the yarnslack eliminating roller 21. Theelectromagnet 36 generates a magnetic field to be applied to theyarn hooking member 22. Thecontrol section 74 allows the magnetic field to generate the resistance torque resisting the rotation of theyarn hooking member 22 relative to the yarnslack eliminating roller 21. Thecontrol section 74 controls the input to theelectromagnet 36 to control the resistance torque. Thecontrol section 74 can control the resistance torque while the spinningmachine 1 is in operation. - Thus, the resistance torque can be varied even while the spinning
machine 1 is performing a spinning operation. Consequently, control can be performed such that an appropriate tension is applied to the spunyarn 10. Furthermore, the resistance torque can be controlled in real time, allowing control to be performed such that an optimum yarn tension is applied to the spunyarn 10 according to spinning conditions. - Furthermore, the
control section 74 according to the present embodiment controls the resistance torque according to the yarn winding diameter. - Thus, the yarn tension can be varied according to the yarn winding diameter, allowing the quality of the
package 45 to be improved. - The
control section 74 according to the present embodiment performs control such that the resistance torque is set to be higher when the yarn winding diameter is small than when the yarn winding diameter is large. - Thus, formation of an unacceptable package such as bulge winding can be prevented, thus allowing the quality of the
package 45 to further be improved. - Furthermore, the
control section 74 according to the present embodiment performs control such that when the spinningmachine 1 starts spinning, the resistance torque is reduced before the spunyarn 10 is hooked on theyarn hooking member 22. - Thus, possible yarn breakage can be prevented which results from an excessively high tension applied to the spun
yarn 10 when theflyer 38 engages with the spunyarn 10. - Furthermore, the
control section 74 according to the present embodiment performs control such that the resistance torque is increased at the timing (t6) corresponding to a predetermined period of time after the start of the spinning operation (timing t3). - Thus, in accordance with a simple control, a determination can be made that the spun
yarn 10 has been wound around the yarnslack eliminating roller 21, and the resistance torque can be set back to an appropriate value. - Furthermore, in the present embodiment, the
control section 74 performs control such that at the start of the spinning following yarn splicing, the resistance torque is reduced before the spunyarn 10 is hooked on theyarn hooking member 22. - Thus, the resistance torque can be appropriately controlled so as to prevent an excessive tension from being applied during yarn splicing, in which yarn breakage is likely to occur.
- Furthermore, the
control section 74 controls the resistance torque in conjunction with traverse of the spunyarn 10. - Thus, the variation in tension resulting from the traversing of the spun
yarn 10 can be absorbed by the yarnslack eliminating device 12. Consequently, an appropriate tension can be applied to the spunyarn 10 according to the traverse position. Therefore, thepackage 45 with preferred quality can be formed. - Furthermore, in the present embodiment, the
control section 74 performs control such that in case of winding a cone package, the resistance torque is reduced when the spunyarn 10 is wound around the larger diameter side of thepackage 45, and the resistance torque is increased when the spunyarn 10 is wound on the smaller diameter side of thepackage 45. - Thus, an appropriate tension can be applied to the spun
yarn 10, allowing a cone winding package with preferred quality to be formed. - A preferred embodiment of the present invention has been described. However, the above-described configuration can be varied, for example, as described below.
- According to the above-described embodiment, a control is performed such that, during yarn splicing operation, the resistance torque applied to the
yarn hooking member 22 becomes zero at the timing t1, shown inFigure 6 . To prevent possible yarn breakage during a yarn splicing operation, it is sufficient to change the resistance torque applied to beyarn hooking member 22 to a predetermined value at the timing (t2). Thus, the resistance torque may have any value at the timing (t1). For example, as shown by an alternate long and two short dashes line inFigure 6 , the resistance torque may avoid being changed until the timing (t2). This simplifies the control of the resistance torque. - The
control section 74 may be provided inside in the yarnslack eliminating device 12 or provided on thespinning unit 2 side. If thecontrol section 74 is provided on thespinning unit 2 side, thecontrol section 74 may be configured as a part of the function of theunit controller 73. - Instead of the arrangement that detects the yarn winding diameter from the yarn speed and the elapsed period of time, an arrangement may be provided which detects the yarn winding diameter using a dedicated winding diameter sensor provided in the
spinning unit 2. - The timing at which the resistance torque is recovered may be such that the recovery is performed after an elapse of a predetermined period of time from the start of a spinning operation or after an elapse of a predetermined period of time from when the
upstream guide 23 has moved to the retracted position and the spunyarn 10 can be engaged with theflyer 38. - Even for packages other than the cone winding package, the package quality can be improved by controlling the resistance torque according to the yarn traverse position. For example, in case of a cheese winding package, the yarn tension increases when the yarn is traversed towards the package end than when the yarn is traversed in a central portion of the width of the package. Thus, a package with a uniform winding tension can be formed by reducing the resistance torque when the traverse position is located at one of the opposite ends of the package width, while increasing the resistance torque when the traverse position is located in the central portion of the package width.
- While the present invention has been described with respect to preferred embodiments thereof, it will be apparent to those skilled in the art that the disclosed invention may be modified in numerous ways and may assume many embodiments other than those specifically set out and described above. Accordingly, it is intended by the appended claims to cover all modifications of the present invention that fall within the true spirit and scope of the invention.
Claims (9)
- A yarn slack eliminating device (12) provided in a spinning machine (1), the yarn slack eliminating device (12) comprising:a driving source (25);a yarn slack eliminating roller (21) rotationally driven by the driving source (25);a yarn hooking member (22) concentrically attached to the yarn slack eliminating roller (21) so as to be rotatable relative to the yarn slack eliminating roller (21);an electromagnet (36) generating a magnetic field applied to the yarn hooking member (22); anda control section (74) allowing the magnetic field to generate a resistance torque resisting the rotation of the yarn hooking member (22) relative to the yarn slack eliminating roller (21), the control section (74) controlling an input to the electromagnet (36) to control the resistance torque,characterized in that the control section (74) can control the resistance torque while the spinning machine (1) is in operation.
- The yarn slack eliminating device (12) according to Claim 1, characterized in that the control section (74) controls the resistance torque according to a yarn winding diameter.
- The yarn slack eliminating device (12) according to Claim 2, characterized in that the control section (74) performs control such that the resistance torque is set to be higher when the yarn winding diameter is small than when the yarn winding diameter is large.
- The yarn slack eliminating device (12) according to any one of Claims 1 to 3, characterized in that the control section (74) performs control such that when the spinning machine (1) starts a spinning operation, the resistance torque is reduced before the yarn is hooked on the yarn hooking member (22).
- The yarn slack eliminating device (12) according to Claim 4, characterized in that the control section (74) performs control such that the resistance torque is increased after an elapse of a predetermined period of time from the start of the spinning operation.
- The yarn slack eliminating device (12) according to Claim 4 or Claim 5, characterized in that the control section (74) performs control such that at the start of the spinning operation during a yarn splicing operation, the resistance torque is reduced before the yarn is hooked on the yarn hooking member (22).
- The yarn slack eliminating device (12) according to any one of Claims 1 to 6, characterized in that the control section (74) controls the resistance torque in conjunction with traverse of the yarn.
- The yarn slack eliminating device (12) according to Claim 7, characterized in that the control section (74) performs control such that in case of winding a cone winding package, the resistance torque is reduced when the yarn is wound on a larger diameter side of the package, and is increased when the yarn is wound on a smaller diameter side of the package.
- A spinning machine (1) including the yarn slack eliminating device (12) according to any one of Claims 1 to 8.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007337974A JP2009155779A (en) | 2007-12-27 | 2007-12-27 | Loose yarn-tightening device and spinning machine equipped with the same |
Publications (3)
Publication Number | Publication Date |
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EP2075359A2 true EP2075359A2 (en) | 2009-07-01 |
EP2075359A3 EP2075359A3 (en) | 2011-05-11 |
EP2075359B1 EP2075359B1 (en) | 2012-06-27 |
Family
ID=40352833
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20080020198 Ceased EP2075359B1 (en) | 2007-12-27 | 2008-11-19 | Yarn slack eliminating device and spinning machine |
Country Status (3)
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EP (1) | EP2075359B1 (en) |
JP (1) | JP2009155779A (en) |
CN (2) | CN104278372B (en) |
Cited By (10)
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EP2189557A1 (en) * | 2008-10-08 | 2010-05-26 | Murata Machinery Ltd. | Yarn slack eliminating device and textile machine including the same |
EP2284300A1 (en) * | 2009-08-06 | 2011-02-16 | Murata Machinery, Ltd. | Spinning machine and yarn removing method for removing yarn remaining on yarn accumulating roller |
EP2298971A1 (en) * | 2009-08-10 | 2011-03-23 | Murata Machinery, Ltd. | Spinning machine with yarn accumulating roller |
EP2365115A1 (en) * | 2010-03-11 | 2011-09-14 | Murata Machinery, Ltd. | Yarn winding machine with yarn slack eliminating roller |
CN103014934A (en) * | 2011-09-20 | 2013-04-03 | 村田机械株式会社 | Spinning unit and spinning machine |
CN103628199A (en) * | 2012-07-12 | 2014-03-12 | 里特捷克有限公司 | Drum inter-storage of yarn at an operating unit of a textile machine and method of controlling it |
US20150175381A1 (en) * | 2013-12-20 | 2015-06-25 | Rieter Cz S.R.O. | Drum Intermediate Storage Device for a Textile Machine |
EP2966020A1 (en) * | 2014-07-10 | 2016-01-13 | Murata Machinery, Ltd. | Yarn accumulating device, yarn winding unit, and yarn winding machine |
EP2987755A1 (en) * | 2014-08-21 | 2016-02-24 | Murata Machinery, Ltd. | Yarn winding device and automatic winder |
DE102018119164A1 (en) * | 2018-08-07 | 2020-02-13 | Maschinenfabrik Rieter Ag | Yarn store for a spinning or winding machine |
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JP2014125349A (en) * | 2012-12-27 | 2014-07-07 | Murata Mach Ltd | Yarn storage apparatus and spinning unit |
JP2015193451A (en) * | 2014-03-31 | 2015-11-05 | 村田機械株式会社 | Yarn storage roller and yarn winder |
JP2017065898A (en) * | 2015-09-30 | 2017-04-06 | 村田機械株式会社 | Thread guard member, yarn storage device, and yarn winding machine |
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EP3715294A1 (en) | 2019-03-29 | 2020-09-30 | Maschinenfabrik Rieter Ag | Method for controlling a workstation of a textile machine, a device for performing the method |
CZ2019198A3 (en) * | 2019-03-29 | 2020-10-07 | Rieter Cz S.R.O. | Method of managing a textile machine workplace and the equipment for this |
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US9403656B2 (en) | 2012-07-12 | 2016-08-02 | Rieter Cz S.R.O. | Drum inter-storage of yarn at an operating unit of a textile machine and method of control for |
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US20150175381A1 (en) * | 2013-12-20 | 2015-06-25 | Rieter Cz S.R.O. | Drum Intermediate Storage Device for a Textile Machine |
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EP2987755A1 (en) * | 2014-08-21 | 2016-02-24 | Murata Machinery, Ltd. | Yarn winding device and automatic winder |
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EP3611295A1 (en) * | 2018-08-07 | 2020-02-19 | Maschinenfabrik Rieter AG | Yarn accumulating device for a spinning or winding machine |
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CN110817573B (en) * | 2018-08-07 | 2023-02-17 | 里特机械公司 | Yarn storage device for spinning machine or winding machine |
Also Published As
Publication number | Publication date |
---|---|
CN104278372A (en) | 2015-01-14 |
CN101469469A (en) | 2009-07-01 |
JP2009155779A (en) | 2009-07-16 |
EP2075359B1 (en) | 2012-06-27 |
CN104278372B (en) | 2017-04-12 |
EP2075359A3 (en) | 2011-05-11 |
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