EP3115488B1 - Drafting device for spinning frame - Google Patents
Drafting device for spinning frame Download PDFInfo
- Publication number
- EP3115488B1 EP3115488B1 EP16175182.1A EP16175182A EP3115488B1 EP 3115488 B1 EP3115488 B1 EP 3115488B1 EP 16175182 A EP16175182 A EP 16175182A EP 3115488 B1 EP3115488 B1 EP 3115488B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fiber bundle
- roving
- top roller
- teeth
- back top
- 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.)
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Links
- 238000009987 spinning Methods 0.000 title claims description 21
- 239000000835 fiber Substances 0.000 claims description 56
- 230000005540 biological transmission Effects 0.000 claims description 11
- 238000011144 upstream manufacturing Methods 0.000 claims description 7
- 210000000078 claw Anatomy 0.000 description 8
- 210000001520 comb Anatomy 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 229920000297 Rayon Polymers 0.000 description 2
- 239000002964 rayon Substances 0.000 description 2
- 238000007378 ring spinning Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 241000237858 Gastropoda Species 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010040 friction spinning Methods 0.000 description 1
Images
Classifications
-
- 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
- D01H13/14—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements
- D01H13/16—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to reduction in material tension, failure of supply, or breakage, of material
- D01H13/18—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to reduction in material tension, failure of supply, or breakage, of material stopping supply only
-
- 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
- D01H13/14—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements
- D01H13/16—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to reduction in material tension, failure of supply, or breakage, of material
- D01H13/18—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to reduction in material tension, failure of supply, or breakage, of material stopping supply only
- D01H13/188—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to reduction in material tension, failure of supply, or breakage, of material stopping supply only by cutting or clamping yarns or rovings
-
- 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
- D01H13/14—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements
- D01H13/16—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to reduction in material tension, failure of supply, or breakage, of material
- D01H13/18—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to reduction in material tension, failure of supply, or breakage, of material stopping supply only
- D01H13/185—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to reduction in material tension, failure of supply, or breakage, of material stopping supply only a plate moving in the nip of drafting or guiding cylinders
Definitions
- the present invention relates to a drafting device for a spinning frame.
- a spinning frame spins yarn from a roving or a sliver.
- spinning is simultaneously performed by a plurality of spindles.
- the yarn-broken spindle During spinning, when a yarn breaks, spinning is stopped at the spindle where the yarn was broken (hereafter referred to as "the yarn-broken spindle") but continued at the other spindles.
- One type of a spinning frame continues to feed a drafting device that corresponds to the yarn-broken spindle with a fiber bundle that is drawn in and collected when discharged from the drafting device.
- There is another type of spinning frame that includes a stopping device to stop feeding the drafting device that corresponds to the yarn-broken spindle with a fiber bundle.
- Japanese Laid-Open Patent Publication JP 57-133224 A describes a roving stopping device.
- the roving stopping device of Japanese Laid-Open Patent Publication JP 57-133224 A includes a stopping claw fitted to a back bottom roller of a drafting device.
- the stopping claw extends over one half of the circumference of the back bottom roller.
- the stopping claw does not rotate integrally with the back bottom roller when there is no broken yarn.
- the stopping claw pivots (rotates), and the edge of the stopping claw is forced between a roving and the back bottom roller and held between a back top roller and the back bottom roller of the drafting device. This blocks the transmission of rotation from the back bottom roller to the back top roller.
- the stopping claw restricts further rotation of the back top roller, and the roving is held between the stopping claw and the back top roller.
- the drafting device is continuously driven.
- the drafting device pulls and cuts the roving at the downstream side of the back top roller in the feed direction of the roving. This stops feeding the drafting device of the yarn-broken spindle with the roving.
- the roving stopping device of Japanese Laid-Open Patent Publication JP 57-133224 A if the roving includes, for example, fibers of rayon that has high fracture strength, the roving may not break when held between the stopping claw and the back top roller and pulled at the downstream side of the back top roller in the feed direction of the roving.
- a bottom apron runs around a middle bottom roller
- a top apron runs around a middle top roller.
- US 4 538 328 A discloses a device for interrupting feed of a roving on a drawing frame.
- a clamp is provided with a tongue.
- the tongue is forced between a top roller and a bottom roller to block transmission of rotation from the bottom roller to the top roller and clamp a roving with the top roller.
- the clamp includes teeth located upstream of where the top roller and the tongue clamp the roving.
- an area provided with a toothed profile adjoins a clamping edge and cooperates with the clamping edge to interrupt the feed of the roving by engaging the roving with the teeth formed therein.
- US 1 103 329 A discloses a device for a roving stopping for a spinning frame.
- a plunger is provided with spines, which pierce a roving.
- the continued movement of the roving causes the spines, or roughened portions of the plunger, to engage with the roving, thus carrying the plunger with the roving until the plunger is drawn so tightly in the opening of the trumpet guide that the roving can no longer be drawn forward by the feed rolls.
- the fiber bundle feed stopping device 30 stops feeding a drafting device 10 with a roving S1, which serves as a fiber bundle.
- the drafting device 10 is of a three-roller configuration and includes front rollers 11, aprons 13 that run around middle rollers 12, and back rollers 14.
- the front rollers 11 include a front bottom roller 11a and a front top roller 11b.
- the middle rollers 12 include a middle bottom roller 12a and a middle top roller 12b.
- a bottom apron 13a runs around the middle bottom roller 12a, and a top apron 13b runs around the middle top roller 12b.
- the back rollers 14 include a back bottom roller 14a and a back top roller 14b.
- the front bottom roller 11a is supported by a roller stand 15.
- the middle bottom roller 12a is supported on the roller stand 15 by a middle bottom roller support 16 and a bearing (not shown).
- the back bottom roller 14a is supported on the roller stand 15 by a back bottom roller support 17 and a bearing (not shown).
- the middle bottom roller support 16 and the back bottom roller support 17 are each fixed to the roller stand 15 in a manner allowing for adjustment of the positions of the middle bottom roller support 16 and the back bottom roller support 17 relative to the roller stand 15 in the front-rear direction of the frame (lateral direction in Fig. 1 ).
- the front top roller 11b, the middle top roller 12b, and the back top roller 14b are respectively supported by top roller supports (not shown) on the weighting arm 18.
- a support bar 21 extends behind and parallel to the back bottom roller 14a.
- a trumpet 22 is fixed to the support bar 21 to guide the roving S1.
- the roving S1 is fed from a roving winding, which is suspended from a creel (not shown), through the trumpet 22 and to the back rollers 14.
- the drafting device 10 includes a fiber bundle feed stopping device 30.
- the fiber bundle feed stopping device 30 includes a stopping member 31 engaged with approximately one half of the outer circumferential surface of the back bottom roller 14a.
- the stopping member 31 is curved in an arcuate manner like a crescent. The stopping member 31 does not rotate integrally with the back bottom roller 14a.
- the stopping member 31 includes a combing portion 32 defined by a region located near one end (distal end) of the curved outer circumferential surface.
- the combing portion 32 includes teeth 32a.
- the teeth 32a are arranged in rows, each extending in a direction orthogonal to the feed direction of the roving S1.
- the teeth rows are arranged next to one another in the feed direction of the roving S1.
- four teeth rows are arranged next to one another in the feed direction.
- the teeth 32a in each teeth row is shifted by one half of a teeth pitch relative to the teeth 32a in the teeth row that is adjacent in the feed direction of the roving S1.
- the portion of the stopping member 31 at the distal side of the combing portion 32 defines a wedge 33 that is forced between the back top roller 14b and the back bottom roller 14a.
- the stopping member 31 is rotated between a fiber bundle release position, as shown by the broken lines, and a fiber bundle clamp position, as shown by the solid lines.
- the stopping member 31 is separated from the back top roller 14b.
- the stopping member 31 is located at the fiber bundle clamp position, the back top roller 14b and the wedge 33 clamp the fiber bundle.
- a rod-shaped drive force transmission member 36 is coupled by a bracket 35 to the stopping member 31.
- a switching device 37 is coupled to the end of the drive force transmission member 36 at the opposite side of the bracket 35.
- a controller (not shown) controls the switching device 37 based on a detection signal from a yarn breakage sensor (not shown).
- the configuration of the switching device 37 is not particularly limited.
- the switching device 37 need only be configured to switch the stopping member 31 between the fiber bundle release position and the fiber bundle clamp position with the drive force transmission member 36 and the bracket 35 under the control of the controller based on the detection signal of the yarn breakage sensor.
- the switching device 37 is driven to linearly reciprocate the drive force transmission member 36.
- Linear reciprocation of the drive force transmission member 36 rotates the stopping member 31 with bracket 35.
- the combing portion 32 is allowed to contact the back top roller 14b. Contact of the combing portion 32 with the back top roller 14b restricts further rotation of the stopping member 31 and positions the stopping member 31 at the fiber bundle clamping position.
- the wedge 33 When the stopping member 31 is positioned at the fiber bundle clamping position, the wedge 33 is forced between the back top roller 14b and the back bottom roller 14a, and the wedge 33 clamps the roving S1 with the back top roller 14b. Further, under this condition, the combing portion 32 pierces the roving S1 at a location upstream of where the roving S1 is clamped between the back top roller 14b and the wedge 33. "Upstream" is defined with reference to the feeding of the roving S1.
- a state in which there are no broken yarns includes a state in which spinning is performed when the roving S1 is fed via the trumpet 22 to the drafting device 10 and a state before spinning starts in which the roving S1 is not yet fed to the drafting device 10.
- the controller does not determine whether or not a yarn has broken since the yarn breakage sensor does not yet detect for a yarn breakage, and the switching device 37 does not rotate the stopping member 31 to the fiber bundle clamp position.
- the roving S1 is guided from the roving winding, which is suspended from the creel (not shown), to the trumpet 22 and fed to the back rollers 14.
- the roving S1 fed to the back rollers 14 is drafted into fleece between the back rollers 14 and the aprons 13 and between the aprons 13 and the front rollers 11. Yarn is formed from the fleece.
- the yarn is guided to a snail wire (not shown) and a traveler (not shown) and wound around a bobbin (not shown).
- the yarn-broken spindle is located from the detection signal of each wire breakage sensor, and the controller drives the switching device 37 that corresponds to the yarn-broken spindle.
- the switching device 37 rotates the stopping member 31 from the fiber bundle release position toward the fiber bundle clamp position. This forces the wedge 33 between the back top roller 14b and the back bottom roller 14a.
- the wedge 33 blocks the transmission of rotation from the back bottom roller 14a to the back top roller 14b. Further, the wedge 33 clamps the roving S1 with the back top roller 14b, the combing portion 32 contacts the back top roller 14b, and further rotation of the stopping member 31 is restricted. This positions the stopping member 31 at the fiber bundle clamp position.
- the combing portion 32 pierces the roving S1 upstream of where the roving S1 is clamped between the back top roller 14b and the wedge 33 in the feed direction of the roving S1. As the roving S1 passes through the combing portion 32 when the drafting device 10 is driven, the combing portion 32 combs and untwists the roving S1.
- the teeth 32a in each teeth row are shifted by one half of a teeth pitch relative to the teeth 32a in the teeth row that is adjacent in the feed direction of the roving S1.
- This facilitates the separation of fibers S2 in the roving S1 with the teeth 32a and efficiently untwists the roving S1.
- the teeth 32a weaken the bonding of the fibers S2 and decrease the strength of the roving S1.
- the roving S1 pulled by the drafting device 10 is cut between the back rollers 14 and the aprons 13.
- the wedge 33 blocks the transmission of rotation from the back bottom roller 14a to the back top roller 14b even when the drafting device 10 is continuously driven. This stops feeding of the roving S1 to the drafting device 10 of the spindle where a yarn was broken.
- the combing portion 32 does not have to contact the back top roller 14b as long as the switching device 37 may be accurately driven and controlled so that the wedge 33 is forced between the back top roller 14b and the back bottom roller 14a to clamp the roving S1 with the back top roller 14b and restrict further rotation of the stopping member 31.
- the two edges of the stopping member 31 located at opposite sides in a direction orthogonal to the feed direction of the roving S1 may each include a projection 34 that contacts the back top roller 14b and is separate from the combing portion 32.
- the projections 34 contact the back top roller 14b before the combing portion 32 and restrict contact of the combing portion 32 with the back top roller 14b.
- the sharp teeth 32a of the combing portion 32 do not contact and damage the circumferential surface of the back top roller 14b when combing the roving S1.
- the projections 34 may be used to position the stopping member 31.
- the teeth 32a in each teeth row do not have to be shifted by one half of a teeth pitch relative to the teeth 32a in the teeth row that is adjacent in the feed direction of the roving S1.
- the teeth 32a of each teeth row may be arranged without being shifted from the teeth 32a in other teeth rows.
- the teeth 32a only need to be arranged next to one another in a direction intersecting the feed direction of the roving S1 and do not have to be arranged in a direction orthogonal to the feed direction of the roving S1.
- the fiber bundle is not limited to the roving S1 and may be a sliver.
- the fiber bundle feed stopping device 30 may be used in a ring spinning frame that spins yarns from a sliver with a drafting device, which drafts a fiber bundle at a draft ratio that is much larger than the typical three-roller drafting device.
- the spinning frame is not limited to a ring spinning frame and may be, for example, a faced yarn spinning machine or a friction spinning machine.
- the spinning frame may be a roving frame.
- a fiber bundle feed stopping device for a spinning frame.
- the fiber bundle feed stopping device includes a stopping member provided with a wedge.
- the wedge is forced between a back top roller and a back bottom roller of a drafting device to block transmission of rotation from the back bottom roller to the back top roller and clamp a fiber bundle, which is fed to the drafting device, with the back top roller.
- the stopping member includes a combing portion located upstream of where the back top roller and the wedge clamp the fiber bundle. The combing portion untwists the fiber bundle.
Description
- The present invention relates to a drafting device for a spinning frame.
- A spinning frame spins yarn from a roving or a sliver. In the spinning frame, spinning is simultaneously performed by a plurality of spindles. During spinning, when a yarn breaks, spinning is stopped at the spindle where the yarn was broken (hereafter referred to as "the yarn-broken spindle") but continued at the other spindles. One type of a spinning frame continues to feed a drafting device that corresponds to the yarn-broken spindle with a fiber bundle that is drawn in and collected when discharged from the drafting device. There is another type of spinning frame that includes a stopping device to stop feeding the drafting device that corresponds to the yarn-broken spindle with a fiber bundle. As one type of such a stopping device, Japanese Laid-Open Patent Publication
JP 57-133224 A - The roving stopping device of Japanese Laid-Open Patent Publication
JP 57-133224 A - In the roving stopping device of Japanese Laid-Open Patent Publication
JP 57-133224 A -
US 4 538 328 A discloses a device for interrupting feed of a roving on a drawing frame. In this device, a clamp is provided with a tongue. The tongue is forced between a top roller and a bottom roller to block transmission of rotation from the bottom roller to the top roller and clamp a roving with the top roller. The clamp includes teeth located upstream of where the top roller and the tongue clamp the roving. In this structure, an area provided with a toothed profile adjoins a clamping edge and cooperates with the clamping edge to interrupt the feed of the roving by engaging the roving with the teeth formed therein. -
US 1 103 329 A discloses a device for a roving stopping for a spinning frame. In this device, a plunger is provided with spines, which pierce a roving. In this structure, the continued movement of the roving causes the spines, or roughened portions of the plunger, to engage with the roving, thus carrying the plunger with the roving until the plunger is drawn so tightly in the opening of the trumpet guide that the roving can no longer be drawn forward by the feed rolls. - It is an object of the present invention to provide a drafting device for a spinning frame that easily cuts a fiber bundle.
- This object is solved by a drafting device having the features of
claim 1. Further developments are stated in the dependent claims. - Other aspects and advantages of the present invention will become apparent from the following description, taken in conjunction with the accompanying drawings, illustrating by way of example the principles of the invention.
- The invention, together with objects and advantages thereof, may best be understood by reference to the following description of the presently preferred embodiments together with the accompanying drawings in which:
-
Fig. 1 is a schematic side view of a drafting device in one embodiment; -
Fig. 2 is a partial, enlarged schematic side view of the drafting device shown inFig. 1 ; -
Fig. 3A is a schematic side view of a stopping member; -
Fig. 3B is a plan view of the stopping member; -
Fig. 4 is a schematic side view of a wedge forced between a back top roller and a back bottom roller; -
Fig. 5 is a schematic plan view showing a roving that is untwisted; -
Fig. 6A is a schematic perspective view of a stopping member in a further embodiment; and -
Fig. 6B is a schematic side view showing the wedge forced between the back top roller and the back bottom roller. - One embodiment of a fiber bundle
feed stopping device 30 for a spinning frame will now be described with reference toFigs. 1 to 5 . The fiber bundlefeed stopping device 30 stops feeding adrafting device 10 with a roving S1, which serves as a fiber bundle. - Referring to
Fig. 1 , thedrafting device 10 is of a three-roller configuration and includes front rollers 11, aprons 13 that run aroundmiddle rollers 12, andback rollers 14. The front rollers 11 include a front bottom roller 11a and afront top roller 11b. Themiddle rollers 12 include amiddle bottom roller 12a and amiddle top roller 12b. Abottom apron 13a runs around themiddle bottom roller 12a, and atop apron 13b runs around themiddle top roller 12b. Theback rollers 14 include aback bottom roller 14a and aback top roller 14b. - The front bottom roller 11a is supported by a
roller stand 15. Themiddle bottom roller 12a is supported on theroller stand 15 by a middlebottom roller support 16 and a bearing (not shown). Theback bottom roller 14a is supported on theroller stand 15 by a backbottom roller support 17 and a bearing (not shown). The middlebottom roller support 16 and the backbottom roller support 17 are each fixed to theroller stand 15 in a manner allowing for adjustment of the positions of the middlebottom roller support 16 and the backbottom roller support 17 relative to theroller stand 15 in the front-rear direction of the frame (lateral direction inFig. 1 ). - A
support shaft 19, which is pivotally supported by theroller stand 15, supports aweighting arm 18 with abracket 20. The fronttop roller 11b, the middletop roller 12b, and theback top roller 14b are respectively supported by top roller supports (not shown) on theweighting arm 18. - A
support bar 21 extends behind and parallel to theback bottom roller 14a. Atrumpet 22 is fixed to thesupport bar 21 to guide the roving S1. The roving S1 is fed from a roving winding, which is suspended from a creel (not shown), through thetrumpet 22 and to theback rollers 14. - Referring to
Fig. 2 , the draftingdevice 10 includes a fiber bundlefeed stopping device 30. The fiber bundlefeed stopping device 30 includes a stoppingmember 31 engaged with approximately one half of the outer circumferential surface of the backbottom roller 14a. The stoppingmember 31 is curved in an arcuate manner like a crescent. The stoppingmember 31 does not rotate integrally with the backbottom roller 14a. - As shown in
Figs. 3A and 3B , the stoppingmember 31 includes a combingportion 32 defined by a region located near one end (distal end) of the curved outer circumferential surface. The combingportion 32 includesteeth 32a. Theteeth 32a are arranged in rows, each extending in a direction orthogonal to the feed direction of the roving S1. The teeth rows are arranged next to one another in the feed direction of the roving S1. In the present embodiment, four teeth rows are arranged next to one another in the feed direction. Theteeth 32a in each teeth row is shifted by one half of a teeth pitch relative to theteeth 32a in the teeth row that is adjacent in the feed direction of the roving S1. The portion of the stoppingmember 31 at the distal side of the combingportion 32 defines awedge 33 that is forced between the backtop roller 14b and the backbottom roller 14a. - Referring to
Fig. 4 , the stoppingmember 31 is rotated between a fiber bundle release position, as shown by the broken lines, and a fiber bundle clamp position, as shown by the solid lines. When the stoppingmember 31 is located at the fiber bundle release position, the stoppingmember 31 is separated from the backtop roller 14b. When the stoppingmember 31 is located at the fiber bundle clamp position, the backtop roller 14b and thewedge 33 clamp the fiber bundle. A rod-shaped driveforce transmission member 36 is coupled by abracket 35 to the stoppingmember 31. - As shown in
Fig. 1 , aswitching device 37 is coupled to the end of the driveforce transmission member 36 at the opposite side of thebracket 35. A controller (not shown) controls theswitching device 37 based on a detection signal from a yarn breakage sensor (not shown). The configuration of theswitching device 37 is not particularly limited. The switchingdevice 37 need only be configured to switch the stoppingmember 31 between the fiber bundle release position and the fiber bundle clamp position with the driveforce transmission member 36 and thebracket 35 under the control of the controller based on the detection signal of the yarn breakage sensor. - Referring to
Fig. 4 , in the present embodiment, the switchingdevice 37 is driven to linearly reciprocate the driveforce transmission member 36. Linear reciprocation of the driveforce transmission member 36 rotates the stoppingmember 31 withbracket 35. The combingportion 32 is allowed to contact the backtop roller 14b. Contact of the combingportion 32 with the backtop roller 14b restricts further rotation of the stoppingmember 31 and positions the stoppingmember 31 at the fiber bundle clamping position. - When the stopping
member 31 is positioned at the fiber bundle clamping position, thewedge 33 is forced between the backtop roller 14b and the backbottom roller 14a, and thewedge 33 clamps the roving S1 with the backtop roller 14b. Further, under this condition, the combingportion 32 pierces the roving S1 at a location upstream of where the roving S1 is clamped between the backtop roller 14b and thewedge 33. "Upstream" is defined with reference to the feeding of the roving S1. - The operation of the present embodiment will now be described.
- When there are no broken yarns, the stopping
member 31 is held at the fiber bundle release position. A state in which there are no broken yarns includes a state in which spinning is performed when the roving S1 is fed via thetrumpet 22 to thedrafting device 10 and a state before spinning starts in which the roving S1 is not yet fed to thedrafting device 10. In a state before spinning starts, the controller does not determine whether or not a yarn has broken since the yarn breakage sensor does not yet detect for a yarn breakage, and theswitching device 37 does not rotate the stoppingmember 31 to the fiber bundle clamp position. - When the spinning frame starts to operate, the roving S1 is guided from the roving winding, which is suspended from the creel (not shown), to the
trumpet 22 and fed to theback rollers 14. The roving S1 fed to theback rollers 14 is drafted into fleece between theback rollers 14 and theaprons 13 and between theaprons 13 and the front rollers 11. Yarn is formed from the fleece. The yarn is guided to a snail wire (not shown) and a traveler (not shown) and wound around a bobbin (not shown). - When a yarn breakage occurs, the yarn-broken spindle is located from the detection signal of each wire breakage sensor, and the controller drives the
switching device 37 that corresponds to the yarn-broken spindle. The switchingdevice 37 rotates the stoppingmember 31 from the fiber bundle release position toward the fiber bundle clamp position. This forces thewedge 33 between the backtop roller 14b and the backbottom roller 14a. Thewedge 33 blocks the transmission of rotation from the backbottom roller 14a to the backtop roller 14b. Further, thewedge 33 clamps the roving S1 with the backtop roller 14b, the combingportion 32 contacts the backtop roller 14b, and further rotation of the stoppingmember 31 is restricted. This positions the stoppingmember 31 at the fiber bundle clamp position. In addition, the combingportion 32 pierces the roving S1 upstream of where the roving S1 is clamped between the backtop roller 14b and thewedge 33 in the feed direction of the roving S1. As the roving S1 passes through the combingportion 32 when thedrafting device 10 is driven, the combingportion 32 combs and untwists the roving S1. - As shown in
Fig. 5 , theteeth 32a in each teeth row are shifted by one half of a teeth pitch relative to theteeth 32a in the teeth row that is adjacent in the feed direction of the roving S1. This facilitates the separation of fibers S2 in the roving S1 with theteeth 32a and efficiently untwists the roving S1. Further, theteeth 32a weaken the bonding of the fibers S2 and decrease the strength of the roving S1. Thus, even when the roving S1 has high strength, the roving S1 pulled by the draftingdevice 10 is cut between theback rollers 14 and theaprons 13. Moreover, thewedge 33 blocks the transmission of rotation from the backbottom roller 14a to the backtop roller 14b even when thedrafting device 10 is continuously driven. This stops feeding of the roving S1 to thedrafting device 10 of the spindle where a yarn was broken. - The above embodiment has the advantages described below.
- (1) The stopping
member 31 includes the combingportion 32, which untwists the roving S1, at a location upstream of where the roving S1 is clamped between the backtop roller 14b and thewedge 33. As the roving S1 moves through the combingportion 32 when thedrafting device 10 is driven, the combingportion 32 combs and untwists the roving S1. This weakens the bonding of the fibers S2 in the roving S1 and decrease the strength of the roving S1. Thus, the roving S1 is easily cut when pulled by the draftingdevice 10. - (2) The combing
portion 32 is allowed to contact the backtop roller 14b. Contact of the combingportion 32 with the backtop roller 14b increases the positioning accuracy of the stoppingmember 31 relative to the backtop roller 14b. Thus, thewedge 33 may be accurately forced between the backtop roller 14b and the backbottom roller 14a. - (3) Even when the roving S1 includes, for example, fibers of rayon that has high fracture strength, the combing
portion 32 combs and untwists the roving S1. This weakens the bonding of the fibers S2 in the roving S1 and decrease the strength of the roving S1. Thus, the roving S1 is cut even when the roving S1 has high fracture strength. This avoids wear of thebottom apron 13a and thetop apron 13b that would occur if thebottom apron 13a and thetop apron 13b were to rotate and slip on the roving S1 when the roving S1 is not cut. - (4) The
teeth 32a in each teeth row is shifted by one half of a teeth pitch relative to theteeth 32a in the teeth row that is adjacent in the feed direction of the roving S1. Thus, when thedrafting device 10 is driven and the roving S1 passes through theteeth 32a, the teeth rows facilitate the separation of the fibers S2. This further efficiently untwists the roving S1. - The above embodiment may be modified as described below.
- In the above embodiment, the combing
portion 32 does not have to contact the backtop roller 14b as long as the switchingdevice 37 may be accurately driven and controlled so that thewedge 33 is forced between the backtop roller 14b and the backbottom roller 14a to clamp the roving S1 with the backtop roller 14b and restrict further rotation of the stoppingmember 31. Further, as shown inFigs. 6A and 6B , the two edges of the stoppingmember 31 located at opposite sides in a direction orthogonal to the feed direction of the roving S1 may each include aprojection 34 that contacts the backtop roller 14b and is separate from the combingportion 32. When the stoppingmember 31 is rotated from the fiber bundle release position toward the fiber bundle clamp position, theprojections 34 contact the backtop roller 14b before the combingportion 32 and restrict contact of the combingportion 32 with the backtop roller 14b. Thus, thesharp teeth 32a of the combingportion 32 do not contact and damage the circumferential surface of the backtop roller 14b when combing the roving S1. Further, theprojections 34 may be used to position the stoppingmember 31. - In the above embodiment, the
teeth 32a in each teeth row do not have to be shifted by one half of a teeth pitch relative to theteeth 32a in the teeth row that is adjacent in the feed direction of the roving S1. Theteeth 32a of each teeth row may be arranged without being shifted from theteeth 32a in other teeth rows. - In the above embodiment, there may be two or three teeth rows arranged next to one another in the feed direction of the roving S1. Alternatively, there may be five or more teeth rows arranged next to one another in the feed direction of the roving S1.
- In the above embodiment, there may be only one row of teeth that extends in a direction orthogonal to the feed direction of the roving S1.
- In the above embodiment, the
teeth 32a only need to be arranged next to one another in a direction intersecting the feed direction of the roving S1 and do not have to be arranged in a direction orthogonal to the feed direction of the roving S1. - In the above embodiment, the fiber bundle is not limited to the roving S1 and may be a sliver. For example, the fiber bundle
feed stopping device 30 may be used in a ring spinning frame that spins yarns from a sliver with a drafting device, which drafts a fiber bundle at a draft ratio that is much larger than the typical three-roller drafting device. - In the above embodiment, the spinning frame is not limited to a ring spinning frame and may be, for example, a fascinated yarn spinning machine or a friction spinning machine.
- In the above embodiment, the spinning frame may be a roving frame.
- Therefore, the present examples and embodiments are to be considered as illustrative and not restrictive and the invention is not to be limited to the details given herein, but may be modified within the scope and equivalence of the appended claims.
- A fiber bundle feed stopping device for a spinning frame. The fiber bundle feed stopping device includes a stopping member provided with a wedge. The wedge is forced between a back top roller and a back bottom roller of a drafting device to block transmission of rotation from the back bottom roller to the back top roller and clamp a fiber bundle, which is fed to the drafting device, with the back top roller. The stopping member includes a combing portion located upstream of where the back top roller and the wedge clamp the fiber bundle. The combing portion untwists the fiber bundle.
Claims (6)
- A drafting device (10) for a spinning frame, wherein the drafting device (10) includes a back top roller (14b), a back bottom roller (14a) and a fiber bundle feed stopping device (30), the fiber bundle feed stopping device (30) includes a stopping member (31) provided with a wedge (33), the wedge (33) is forced between the back top roller (14b) and the back bottom roller (14a) to block transmission of rotation from the back bottom roller (14a) to the back top roller (14b) and clamp a fiber bundle (S1), which is fed to the drafting device (10), with the back top roller (14b), the stopping member (31) is configured to move between a fiber bundle release position that is where the stopping member (31) is separated from the back top roller (14b) and a fiber bundle clamp position that is where the back top roller (14b) and the wedge (33) clamp the fiber bundle (S1),
wherein the stopping member (31) includes a combing portion (32) located upstream of where the back top roller (14b) and the wedge (33) clamp the fiber bundle (S1), wherein the combing portion (32) is configured to, when the stopping member (31) is at the fiber bundle clamp position while the draft device (10) is driven, pierce the fiber bundle (S1) and allow the fiber bundle (S1) to move through the combing portion (32), thereby combing and untwisting the fiber bundle (S1). - The drafting device (10) according to claim 1, characterized in that the combing portion (32) contacts the back top roller (14b) when the stopping member (31) is at the fiber bundle clamp position.
- The drafting device (10) according to claim 1, characterized in that the stopping member (31) includes a projection (34) that is separate from the combing portion (32), the projection (34) contacts the back top roller (14b) and restricts contact of the combing portion (32) with the back top roller (14b) when the stopping member (31) is at the fiber bundle clamp position.
- The drafting device (10) according to claim 3, characterized in that the projection (34) contacts the back top roller (14b) to restrict contact of the combing portion (32) with the back top roller (14b).
- The drafting device (10) according to any one of claims 1 to 4, characterized in that the combing portion (32) includes a row of teeth (32a) arranged next to each other in a direction intersecting the feed direction of the fiber bundle (S1).
- The drafting device (10) according to any one of claims 1 to 4, characterized in that:the combing portion (32) includes teeth rows arranged next to each other in the feed direction of the fiber bundle (S1),each of the teeth rows includes teeth (32a) arranged next to each other in a direction intersecting the feed direction of the fiber bundle (S1); andthe teeth (32a) in each of the teeth rows are shifted by one half of a teeth pitch relative to the teeth (32a) in the teeth row that is adjacent in the feed direction of the fiber bundle (S1).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2015136913A JP6369406B2 (en) | 2015-07-08 | 2015-07-08 | Spindle fiber bundle supply stop device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3115488A1 EP3115488A1 (en) | 2017-01-11 |
EP3115488B1 true EP3115488B1 (en) | 2020-12-23 |
Family
ID=56137229
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP16175182.1A Active EP3115488B1 (en) | 2015-07-08 | 2016-06-20 | Drafting device for spinning frame |
Country Status (4)
Country | Link |
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EP (1) | EP3115488B1 (en) |
JP (1) | JP6369406B2 (en) |
CN (1) | CN106337222B (en) |
ES (1) | ES2862925T3 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP7206717B2 (en) * | 2018-09-11 | 2023-01-18 | 株式会社豊田自動織機 | Control method of pot spinning machine |
EP3696302A1 (en) * | 2019-02-12 | 2020-08-19 | Pinter Caipo, S.A.U. | A spinning system and method of spinning plain yarn or fancy yarn with said spinning system |
WO2020089486A1 (en) * | 2018-11-02 | 2020-05-07 | Pinter Caipo, S.A.U. | Drafting assembly for a ring spinning machine and drafting kits for drafting fibres on a ring spinning machine |
JP7151039B2 (en) * | 2019-06-18 | 2022-10-12 | 株式会社豊田自動織機 | Spinning frame |
CN112239902B (en) * | 2019-07-19 | 2022-02-08 | 铜陵松宝智能装备股份有限公司 | Driving mechanism, device and method for automatic feeding stopping and re-feeding of roving |
CN110344144A (en) * | 2019-08-13 | 2019-10-18 | 上海兰宝传感科技股份有限公司 | A kind of band tooth lock cover of rove stopping supply device |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1103329A (en) * | 1913-12-04 | 1914-07-14 | Edward J Vales | Roving-stop for spinning-frames. |
DE3048481C3 (en) * | 1980-12-22 | 1992-02-20 | Schurr Stahlecker & Grill | DEVICE FOR INTERRUPTING THE FEEDING OF A ROVER ON STRETCHING DEVICES OF A SPINNING MACHINE |
IT1140368B (en) * | 1981-01-02 | 1986-09-24 | Skf Kugellagerfabriken Gmbh | WINDER LOCKING DEVICE IN WIRING IRONERS |
DE3100049C2 (en) * | 1981-01-02 | 1983-11-10 | Skf Kugellagerfabriken Gmbh, 8720 Schweinfurt | Lunt locking device on spinning machine drafting systems |
DE3318925A1 (en) * | 1983-05-25 | 1984-11-29 | Stahlecker, Fritz, 7347 Bad Überkingen | DEVICE FOR INTERRUPTING THE FEEDING OF A ROVER ON A STRETCHER |
JPH0718062B2 (en) * | 1986-09-16 | 1995-03-01 | 豊和工業株式会社 | Roving cutting method |
EP0357894A1 (en) * | 1988-09-03 | 1990-03-14 | Zinser Textilmaschinen GmbH | Device for stopping the sliver in a drafting arrangement of a spinning machine |
US5758482A (en) * | 1996-06-04 | 1998-06-02 | American Linc Corporation | Sliver stop motion for spinning machine |
JP5979121B2 (en) * | 2013-11-18 | 2016-08-24 | 株式会社豊田自動織機 | Spindle fiber bundle supply stop device |
-
2015
- 2015-07-08 JP JP2015136913A patent/JP6369406B2/en not_active Expired - Fee Related
-
2016
- 2016-06-20 EP EP16175182.1A patent/EP3115488B1/en active Active
- 2016-06-20 ES ES16175182T patent/ES2862925T3/en active Active
- 2016-07-05 CN CN201610520329.XA patent/CN106337222B/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
---|---|
EP3115488A1 (en) | 2017-01-11 |
CN106337222B (en) | 2020-06-23 |
CN106337222A (en) | 2017-01-18 |
JP6369406B2 (en) | 2018-08-08 |
JP2017020124A (en) | 2017-01-26 |
ES2862925T3 (en) | 2021-10-08 |
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