EP3527701B1 - Rewinding method employed in pot spinning machine following yarn breakage - Google Patents
Rewinding method employed in pot spinning machine following yarn breakage Download PDFInfo
- Publication number
- EP3527701B1 EP3527701B1 EP19155224.9A EP19155224A EP3527701B1 EP 3527701 B1 EP3527701 B1 EP 3527701B1 EP 19155224 A EP19155224 A EP 19155224A EP 3527701 B1 EP3527701 B1 EP 3527701B1
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- European Patent Office
- Prior art keywords
- pot
- yarn
- cake
- bobbin
- rewinding
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- 238000009987 spinning Methods 0.000 title claims description 42
- 238000000034 method Methods 0.000 title claims description 31
- 238000004804 winding Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 7
- 239000010410 layer Substances 0.000 description 10
- 239000000463 material Substances 0.000 description 5
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007547 defect Effects 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
- 238000002474 experimental method Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000007378 ring spinning Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H1/00—Spinning or twisting machines in which the product is wound-up continuously
- D01H1/08—Spinning or twisting machines in which the product is wound-up continuously cup, pot or disc type, in which annular masses of yarn are formed by centrifugal action
-
- 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
- D01H13/32—Counting, measuring, recording or registering devices
Definitions
- the present invention relates to a rewinding method employed in a pot spinning machine following yarn breakage.
- a pot spinning method using a cylindrical pot is well known as a spinning method.
- a cylindrical bobbin is disposed on the outside of a yarn guide coaxially with the yarn guide. Then, after forming a cake by winding yarn spun from the yarn guide around an inner wall of the pot while applying twist to the yarn, rewinding of the yarn onto the bobbin is started.
- US 6 109 014 A relates to a method and a device for initiating the rewinding process after a yarn break in single stage pot spinning.
- a yarn detaching device is introduced into a spinning centrifuge rotating a high rpm, and places a cutting edge against the conically wound portion of a spinning cake deposited on the inner wall of the spinning centrifuge.
- the yarn detaching device has a yarn guide device, whose yarn guide contour covers the cutting edge of the yarn detaching device such that in the course of the initiation of the rewinding process lower winding layers of the conically wound portion are lifted on the rewinding tube and in this way dependably prevents the winding of yarn around the yarn detaching device during the rewinding process.
- the present invention has been designed to solve the problem described above, and an object thereof is to provide a rewinding method employed in a pot spinning machine following yarn breakage, with which the occurrence frequency of multilayer rewinding can be reduced.
- a rewinding method employed in a pot spinning machine following yarn breakage according to the present invention includes a cake forming step of forming a cake by rotating a pot having an opening and winding yarn drawn out to a predetermined thickness around an inner wall of the pot, an end of the cake detecting step of detecting a lower end of the cake on the opening side when yarn breakage is detected by a yarn breakage detection unit before completion of the cake forming step, a bobbin disposing step of disposing a bobbin inside the pot through the opening after yarn breakage is detected, and a contact step of bringing an elongated member into contact with the inner wall of the pot through the opening, closer to the opening than the lower end of the cake detected in the end of the cake detecting step.
- FIG. 1 is a schematic view showing configurational example of an upper portion, above a pot, of the pot spinning machine according to this embodiment of the present invention.
- a pot spinning machine 1 includes a drafting device 10, a yarn guide 11, a pot 12, and a bobbin support 13. Note that these constituent elements together constitute a single spindle, which serves as a single spinning unit.
- the pot spinning machine 1 includes a plurality of spindles, but with reference to FIG. 1 , the configuration of one of the plurality of spindles will be described.
- a drafting device is provided above the pot 12.
- the drafting device 10 is a device for drawing out a yarn material such as roving to a predetermined thickness.
- the drafting device 10 is formed using a plurality of roller pairs constituted by a back roller pair 15, a middle roller pair 16, and a front roller pair 17.
- the plurality of roller pairs are arranged in order of the back roller pair 15, the middle roller pair 16, and the front roller pair 17 from an upstream side toward a downstream side in a conveyance direction of the yarn material.
- the respective roller pairs 15, 16, 17 rotate when driven by a drafting drive unit, to be described below.
- rotation frequencies per unit time (rpm) of the respective roller pairs 15, 16, 17 are compared, the rotation frequency of the middle roller pair 16 is higher than the rotation frequency of the back roller pair 15, and the rotation frequency of the front roller pair 17 is higher than the rotation frequency of the middle roller pair 16.
- the respective roller pairs 15, 16, 17 have different rotation frequencies, and using these rotation frequency differences, or in other words rotation speed differences, the drafting device 10 draws the yarn material out thinly.
- the rotation frequencies of the roller pairs will also be referred to as rotation speeds.
- the rotation frequency and the rotation speed of each roller pair have a mutual corresponding relationship.
- the yarn guide 11 guides yarn 18 drawn out to the predetermined thickness by the drafting device 10 into the pot 12.
- the yarn guide 11 is formed in the shape of a long, narrow tube.
- the yarn guide 11 has a circular shape on a cross-section cut in an orthogonal direction to a length direction thereof.
- the yarn guide 11 is disposed coaxially with the pot 12 on the downstream side of the drafting device 10. A lower portion of the yarn guide 11 is inserted into the pot 12.
- the yarn guide 11 guides the yarn 18, which is supplied from the front roller pair 17 through a yarn supply pipe 14, into the pot 12.
- the yarn 18 drawn out by the drafting device 10 is pulled into the yarn supply pipe 14 using a swirling flow of air, for example, and then introduced into the yarn guide 11 through the yarn supply pipe 14.
- the yarn 18 introduced into the yarn guide 11 is spun from a lower end 11a of the yarn guide 11.
- the yarn guide 11 is provided to be movable in a vertical direction by a yarn guide drive unit, to be described below.
- a yarn sensor 19 is disposed between the front roller pair 17 and the yarn supply pipe 14. Note that the yarn sensor may be disposed in another desired position rather than between the front roller pair 17 and the yarn supply pipe 14.
- the yarn sensor 19 is a sensor for detecting the state of the yarn drawn out by the drafting device 10. In this embodiment, yarn breakage is used as an example of a state of the yarn detected by the yarn sensor 19. Further, in this embodiment, the yarn sensor 19 is formed using an optical sensor combining a light-emitting device 19a and a light-receiving device 19b, for example.
- the yarn sensor 19 constitutes a yarn breakage detection unit.
- the pot 12 is used to form a cake 28 and rewind the yarn.
- the pot 12 is formed in a cylindrical shape.
- the pot 12 is provided to be capable of rotating about a central axis K of the pot 12.
- the central axis K of the pot 12 is disposed parallel to the vertical direction. Accordingly, one side of the central axis direction of the pot 12 is an upward side and the other side is a downward side.
- the pot 12 rotates when driven by a pot driving unit, to be described below.
- a yarn guide insertion port 21 is formed in an upper end side of the pot 12.
- the yarn guide insertion port 21 is an opening through which the yarn guide 11 is inserted into the pot 12.
- An opening 23 is formed in a lower end of the pot 12.
- the yarn guide insertion port 21 opens upward and has a smaller diameter than a diameter (referred to hereafter as a "pot inner diameter") that defines an inner volume of the pot 12 and is based on the position of an inner wall 22.
- the opening 23 opens downward and has a diameter identical to the pot inner diameter.
- FIG. 2 is a schematic view showing configurational example of a lower portion, below the pot, of the pot spinning machine according to this embodiment of the present invention.
- a cylindrical bobbin 25 carried on a bobbin rail 26, the pot 12, which is capable of housing the bobbin 25, a filler (an elongated member) 73, and a wagon unit 75 are provided in the lower portion of the pot spinning machine 1.
- the bobbin 25 and the elongated member 73 are each provided in a plurality corresponding to the number of spindles along the bobbin rail 26.
- the bobbin rail 26 is configured to be elevatable in a vertical direction.
- a slide pipe 71 is provided below the bobbin rail 26 so as to extend along the bobbin rail 26.
- the slide pipe 71 is supported by a slider guide 72 fixed to the bobbin rail 26 to be capable of moving in a horizontal direction along the bobbin rail 26.
- the elongated members 73 having an elongated shape are passed through the bobbin rail 26 and supported on the slide pipe 71 by supporting means, not shown in the figure, to be free to move vertically.
- a solenoid 74 is provided on the slide pipe 71.
- the slide pipe 71 moves in the extension direction of the bobbin rail 26 so that the elongated members 73 all move together in the horizontal direction along the bobbin rail 26.
- the wagon unit 75 travels along the bobbin rail 26 below the elongated members 73. Further, the wagon unit 75 lifts up a desired elongated member 73 using a push-up arm 76 that is raised and lowered by a servo motor, not shown in the figure. After the elongated member 73 has been lifted up by the wagon unit 75, the elongated member 73 is positioned inside the pot 12 by the raising operation of the bobbin rail 26.
- FIG. 3 is a block diagram showing configurational example of a drive control system of the pot spinning machine according to this embodiment of the present invention.
- the pot spinning machine 1 includes a control unit 51, a drafting drive unit 52, a yarn guide drive unit 53, a pot drive unit 54, a bobbin drive unit 55, a rewinding means drive unit 56, the solenoid 74, and the wagon unit 75.
- the control unit 51 performs overall control of all of the operations of the pot spinning machine 1.
- the drafting drive unit 52, the yarn guide drive unit 53, the pot drive unit 54, the bobbin drive unit 55, the rewinding means drive unit 56, the solenoid 74, and the wagon unit 75 are electrically connected to the control unit 51 as operational control objects.
- the yarn sensor 19 is also electrically connected to the control unit 51. When yarn breakage occurs in the drafting device 10, the yarn sensor 19 outputs a yarn breakage occurrence signal informing the control unit 51 of the yarn breakage.
- the drafting drive unit 52 rotates the back roller pair 15, the middle roller pair 16, and the front roller pair 17 at the respective predetermined rotation frequencies thereof.
- the drafting drive unit 52 rotates the back roller pair 15, the middle roller pair 16, and the front roller pair 17 by implementing driving on the basis of a drafting drive signal applied to the drafting drive unit 52 from the control unit 51.
- the yarn guide drive unit 53 operates the yarn guide 11.
- the yarn guide drive unit 53 operates the yarn guide 11 to move in the vertical direction.
- the yarn guide drive unit 53 moves the yarn guide 11 in the vertical direction by implementing driving on the basis of a yarn guide drive signal applied to the yarn guide drive unit 53 from the control unit 51.
- the pot drive unit 54 rotates the pot 12.
- the pot drive unit 54 rotates the pot 12 using the central axis K of the pot 12 as a rotational center by implementing driving on the basis of a pot drive signal applied thereto from the control unit 51.
- the bobbin drive unit 55 operates the bobbin 25.
- the bobbin drive unit 55 operates the bobbin 25 mounted on the bobbin mounting portion 27 of the bobbin support 13 to move in the vertical direction integrally with the bobbin support 13 and the bobbin rail 26.
- the bobbin drive unit 55 moves the bobbin 25 in the vertical direction by implementing driving on the basis of a bobbin drive signal applied thereto from the control unit 51.
- the rewinding means drive unit 56 operates rewinding means, not shown in the figures, during normal rewinding.
- the rewinding means drive unit 56 operates the rewinding means by implementing driving on the basis of a rewinding means drive signal applied thereto from the control unit 51.
- FIG. 4 is a view showing a basic flow of the pot spinning method.
- the pot spinning method includes an end of the cake detecting step S1 and an elongated member position adjusting step S2. Further, during a rewinding operation, the pot spinning method includes a bobbin disposing step S3, a contact step S4, a moving step S5, an elongated member withdrawing step S6, a bobbin disposing step S3A, and a rewinding means driving step S7.
- the end of the cake detecting step S1 is a step of detecting a cake lower end 28b (see FIG. 1 ) of the cake 28 following yarn breakage.
- the elongated member position adjusting step S2 is a step of adjusting the position of the elongated member 73 corresponding to the spindle in which the yarn breakage has been detected.
- the rewinding operation includes yarn breakage rewinding using the elongated member 73 corresponding to the spindle in which yarn breakage has occurred, and normal rewinding using the rewinding means corresponding to the spindles in which yarn breakage has not occurred.
- Yarn breakage rewinding is performed after the bobbin disposing step S3 and includes the contact step S4, the moving step S5, and the elongated member withdrawing step S6.
- the bobbin disposing step S3 is a step of inserting the bobbin 25 into the interior of the pot 12 and disposing the bobbin 25 in a position for starting rewinding.
- the contact step S4 is a step of pushing the elongated member 73 against the inner wall 22 of the pot 12 below the cake lower end 28b.
- the moving step S5 is a step of moving the elongated member 73 toward the cake lower end 28b.
- the elongated member withdrawing step S6 is a step of withdrawing the elongated member 73 to its original position.
- the yarn is rewound onto the bobbin 25 by driving the rewinding means in the rewinding means driving step S7. Operations of the pot spinning machine 1 based on the respective steps will be described below.
- a drawing-out operation is performed using the drafting device 10, as shown in FIG. 1 .
- the drafting drive unit 52 rotates the back roller pair 15, the middle roller pair 16, and the front roller pair 17 at the respective predetermined rotation speeds thereof by implementing driving on the basis of the drafting drive signal applied thereto from the control unit 51.
- the yarn material such as roving, is conveyed by the rotation of the respective roller pairs 15, 16, 17.
- the control unit 51 sets the rotation speed of the back roller pair 15 at a lower speed than the rotation speed of the middle roller pair 16 and sets the rotation speed of the middle roller pair 16 at a lower speed than the rotation speed of the front roller pair 17. Accordingly, the yarn is drawn out between the back roller pair 15 and the middle roller pair 16 by the rotation speed difference between these roller pairs. Similarly, the yarn is drawn out between the middle roller pair 16 and the front roller pair 17 by the rotation speed difference between these roller pairs.
- the yarn material such as roving
- the yarn 18 drawn out in this manner is then pulled into the yarn supply pipe 14 using a swirling flow of air and then introduced into the yarn guide 11.
- control unit 51 applies the pot driving signal to the pot drive unit 54 to rotate the pot 12 at a predetermined rotation frequency.
- the yarn guide drive unit 53 moves the yarn guide 11 by a predetermined amount downward by implementing driving on the basis of the yarn guide drive signal applied thereto from the control unit 51. Further, the pot drive unit 54 continues to rotate the pot 12 by implementing driving on the basis of the pot drive signal applied thereto from the control unit 51. Note that when the yarn guide 11 is moved downward, the yarn guide 11 is in a positon removed from the yarn supply pipe 14. Further, the yarn 18 introduced into the yarn guide 11 from the yarn supply pipe 14 is spun from the lower end 11a of the yarn guide 11.
- Centrifugal force generated by the rotation of the pot 12 acts on the yarn 18 spun from the lower end 11a of the yarn guide 11, and as a result of this centrifugal force, the yarn 18 is pressed into contact with the inner wall 22 of the pot 12. Further, the yarn 18 pressed against the inner wall 22 of the pot 12 is twisted by the rotation of the pot 12. As a result, the yarn 18 spun from the lower end 11a of the yarn guide 11 is wound around the inner wall 22 of the pot 12 in a state where twist is applied thereto by the rotation of the pot 12.
- the yarn guide drive unit 53 displaces the position of the yarn guide 11 relatively downward while moving the yarn guide 11 in a vertical reciprocating motion repeatedly at predetermined intervals.
- the cake 28 is formed on the inner wall 22 of the pot 12.
- the cake 28 is a laminated body formed from the yarn 18 wound around the inner wall 22 of the pot 12.
- FIG. 6 is a view illustrating the operation of the yarn guide during the cake-forming step.
- the vertical axis of the figure shows the position of the yarn guide in the pot central axis direction, and the horizontal axis shows time.
- the yarn guide 11 descends to a P1 position, then ascends to a P2 position, then descends to a P3 position, and then ascends to a P4 position.
- the yarn guide 11 repeatedly performs a vertical reciprocating motion.
- a period T1 from the point at which the yarn guide 11 reaches the P1 position to the point at which the yarn guide 11 reaches the P3 position and a period T2 from the point at which the yarn guide 11 reaches the P2 position to the point at which the yarn guide 11 reaches the P4 position each serve as one period.
- the P3 position is set to be lower than the P1 position and the P4 position is set to be lower than the P2 position.
- a vertical deviation H1 between the P1 position and the P3 position and a vertical deviation H2 between the P2 position and the P4 position each serve as a displacement step amount of the yarn guide 11 during one period.
- the yarn guide 11 is displaced downward by one fixed displacement step amount at a time while performing a vertical reciprocating motion repeatedly at fixed period intervals. This operation of the yarn guide 11 continues until the yarn guide 11 reaches a Pm position.
- the P1 position defines a winding start-side end (also referred to hereafter as a "cake upper end”) 28a of the cake 28 shown in FIG. 1
- the Pm position defines a winding end-side end (also referred to hereafter as a "cake lower end”) 28b of the cake 28 shown in the same figure.
- the control unit 51 operates the yarn guide 11, as shown in FIGS. 5 and 6 , by applying the yarn guide drive signal to the yarn guide drive unit 53.
- the cake 28 is formed on the inner wall 22 of the pot 12 in the shape shown in FIG. 5 .
- the following step is further included after the cake 28 is formed by the operation of the yarn guide 11 in the cake-forming step.
- the control unit 51 moves the yarn guide 11 downward by a predetermined amount Lh.
- the portion of the yarn 18a that serves as the rewinding start point for rewinding the yarn onto the bobbin 25 is wound around the inner wall 22 of the pot 12 in the region 22a closer to the opening 23 side than the cake lower end 28b of the cake 28.
- the portion of the yarn 18a may be wound in a single layer or a plurality of layers. When the portion of the yarn 18a is wound in a single layer, yarn cutting may be performed at a stage where the yarn guide 11 is lowered from the Pm position to a Pn position.
- yarn cutting may be performed at a stage where an operation for lowering the yarn guide 11 from the Pm position to the Pn position and then raising the yarn guide 11 to a higher position than the Pn position has been performed at least once.
- Yarn cutting is performed intentionally at the stage where the yarn 18 is wound around the inner wall 22 of the pot 12 in a predetermined amount set in advance.
- Yarn breakage is a phenomenon whereby the yarn 18 breaks for one of various reasons before being wound around the inner wall 22 of the pot 12 in the predetermined amount.
- Yarn cutting is performed under the control of the control unit 51. More specifically, the control unit 51 controls the driving implemented by the drafting drive unit 52 so that rotation of both the back roller pair 15 and the middle roller pair 16 is stopped while the front roller pair 17 continue to rotate. As a result, the yarn 18 is forcibly cut on the downstream side of the middle roller pair 16.
- the end of the cake detecting step S1 is performed.
- the end of the cake detecting step S1 is performed on each pot 12 in which yarn breakage has occurred.
- a yarn breakage occurrence signal is output to the control unit 51.
- the control unit 51 detects the position of the cake lower end 28b of the cake 28 from the input timing of the yarn breakage occurrence signal. As shown in FIG.
- the control unit 51 detects the position of the cake lower end 28b within the pot 12 by determining the period including the input timing of the yarn breakage occurrence signal.
- the control unit 51 inputs a drive signal into the wagon unit 75 (see FIG. 2 ) to cause the wagon unit 75 to travel to the position of the pot 12 in which the yarn breakage has occurred. Having reached the position of the pot 12 in which the yarn breakage has occurred, the wagon unit 75 lifts up the elongated member 73 by raising the push-up arm 76 in response to input of a drive signal from the control unit 51. At this time, as shown in FIG.
- FIGS. 8 , 9 , and 11 to 13 show the pot 12 in which the yarn breakage was detected during the end of the cake detecting step S1.
- the bobbin disposing step S3 is performed on the pot 12 in which the yarn breakage was detected in the cake forming step.
- the bobbin 25 is disposed inside the pot 12 through the opening 23 by the driving implemented by the pot drive unit 54 (see FIG. 3 ).
- the pot drive unit 54 continues to rotate the pot 12 by implementing driving on the basis of the pot drive signal applied thereto from the control unit 51.
- the bobbin drive unit 55 moves the bobbin support 13 upward by implementing driving on the basis of the bobbin drive signal applied thereto from the control unit 51. Accordingly, the bobbin 25 mounted on the bobbin mounting portion 27 (see FIG. 1 ) moves up together with the bobbin support 13 to several mm below a highest point, as shown in FIG.
- the height of the bobbin rail 26 is raised from an initial position B0 to B1, which is several mm below the highest point of the bobbin rail 26.
- the bobbin 25 is inserted into the pot 12 through the opening 23 of the pot 12. Meanwhile, the yarn guide drive unit 53 moves the yarn guide 11 upward by implementing driving on the basis of the yarn guide drive signal applied thereto from the control unit 51. As a result, before the bobbin 25 enters the pot 12, the lower end 11a of the yarn guide 11 retreats to a position inside the pot 12 where the yarn guide 11 does not contact the bobbin 25.
- the elongated member 73 is lifted up to A1, as shown in FIG. 7 , and therefore, as shown in FIG. 9 , the elongated member 73 enters the pot 12 together with the bobbin 25 and rises to a height of A2.
- the contact step S4 is performed.
- the solenoid 74 (see FIG. 2 ) is switched ON on the basis of a solenoid drive signal applied thereto from the control unit 51 at the time U3
- the slide pipe 71 moves along the bobbin rail 26.
- the respective elongated members 73 move along the bobbin rail 26 in the horizontal direction.
- the elongated member 73 is lifted up in advance, and therefore the elongated member 73 is pressed into contact with the inner wall 22 of the pot 12. At this time, the height of the tip end of the elongated member 73 is several mm below the lower end of the cake 28.
- the end of the broken yarn inside the pot 12 contacts the elongated member 73 and starts to coil around the bobbin 25 disposed on the central axis K (see FIG. 1 ) of the pot 12.
- rewinding onto the bobbin 25 can be started using the end of the broken yarn inside the pot 12 as a rewinding start point.
- the moving step S5 is performed.
- the bobbin drive unit 55 moves the bobbin rail 26 upward to the highest point B2 by implementing driving on the basis of the bobbin drive signal applied thereto from the control unit 51. Accordingly, the bobbin 25 and the elongated member 73 ascend.
- the elongated member 73 moves upward by a distance X from the height A2 to A3 while remaining pressed against the inner wall 22 of the pot 12. As a result, the tip end of the elongated member 73 is pressed into contact with the cake lower end 28b of the cake 28.
- the cutting blade is brought into contact with the cake, and therefore yarn on a lower layer of the cake is lifted up together with the yarn on the uppermost layer of the cake such that multilayer rewinding occurs.
- the height of the cake lower end 28b is detected in the end of the cake detecting step S1, whereupon the tip end of the elongated member 73 is brought into contact with the cake lower end 28b in the moving step S5, and therefore a plurality of layers of the yarn forming the cake 28 are not lifted up at the same time.
- multilayer rewinding can be suppressed.
- the elongated member withdrawing step S6 is performed.
- the control unit 51 lowers the bobbin rail 26 by applying the bobbin drive signal to the bobbin drive unit 55.
- the control unit 51 raises and lowers the push-up arm 76 in order to lower the raised elongated member 73 by applying a drive signal to the wagon unit 75 shown in FIG. 2 .
- yarn breakage rewinding is complete.
- the bobbin disposing step S3A is performed for the purpose of normal rewinding, as shown in FIG. 4 .
- the bobbin disposing step S3A includes identical operations to the bobbin disposing step S3 described above, and is performed simultaneously with the bobbin disposing step S3.
- the rewinding means driving step S7 (see FIG. 4 ) is performed.
- the rewinding means not shown in the figures, contacts the portion of the yarn 18a (see FIG. 5 ), the portion of the yarn 18a starts to coil around the bobbin 25 disposed on the central axis K (see FIG. 1 ) of the pot 12.
- rewinding onto the bobbin 25 can be started using the portion of the yarn 18a discharged into the pot 12 as the rewinding start point.
- the bobbin 25 is obtained with a yarn tube wound thereon.
- the bobbin 25 with the yarn tube wound thereon is removed from the bobbin mounting portion 27.
- An empty bobbin 25 is then mounted on the bobbin mounting portion 27, whereupon similar operations to those described above are performed.
- the end of the cake detecting step S1 for detecting the cake lower end 28b on the opening side of the cake 28 when breakage of the yarn 18 is detected by the yarn breakage detection unit before completion of the cake forming step the end of the cake detecting step S1 for detecting the cake lower end 28b on the opening side of the cake 28 when breakage of the yarn 18 is detected by the yarn breakage detection unit before completion of the cake forming step
- the bobbin disposing step S3 for disposing the bobbin 25 inside the pot 12 through the opening 23 following completion of the cake forming step
- the contact step S4 for bringing the elongated member 73 into contact with the inner wall 22 of the pot 12 through the opening 23, closer to the opening side than the cake lower end 28b of the cake, detected in the end of the cake detecting step S1 the occurrence frequency of multilayer rewinding can be reduced.
- the moving step S5 is provided after the contact step S4 to raise the elongated member 73 while keeping the elongated member 73 in contact with the inner wall 22 of the pot 12 so that the elongated member 73 contacts the cake lower end 28b on the opening side of the cake 28.
- rewinding can be started from the cake lower end 28b even when the yarn 18 cannot be rewound onto the bobbin 25 in the contact step S4, and as a result, the occurrence frequency of multilayer rewinding can be reduced.
- the position of the cake lower end 28b is detected on the basis of the detection timing of the yarn breakage, and therefore the position of the cake lower end 28b can be detected by a simple method. Moreover, the tip end of the elongated member 73 is brought into contact with the cake lower end 28b, and therefore multilayer rewinding can be suppressed.
- the cake lower end 28b of the cake 28 is used as the rewinding start point, and therefore the occurrence frequency of multilayer rewinding can be reduced without greatly modifying the configuration of the pot from that of a pot of a conventional pot spinning machine.
- the pot 12 is provided in a plurality, and in the contact step S4, the elongated members 73 are brought into contact with the inner walls 22 of the plurality of pots 12 simultaneously. Therefore, the time required to implement the entire spinning method is shortened in comparison with a method in which the pots 12 in which yarn breakage occurs are rewound one at a time, and as a result, an improvement in productivity is achieved.
- the pot spinning method includes the moving step S5, but the moving step S5 does not have to be included.
- the bobbin 25 that can be applied to ring spinning is used, but the present invention may be implemented using a different bobbin.
- the yarn sensor 19 constituted by an optical sensor is used, but a yarn sensor employing a different detection system may be used.
- a mechanical yarn sensor that detects yarn breakage mechanically through contact with the yarn may be used.
- the elongated member 73 is brought into contact with the cake lower end 28b, but instead, the elongated member may be brought into contact with the cake upper end 28a.
- a different cake-forming step (a step such as that disclosed in Japanese Patent Application Publication Laid-Open No. H04-308227 , for example) to the cake-forming step shown in FIG. 6 may be performed.
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Description
- The present invention relates to a rewinding method employed in a pot spinning machine following yarn breakage.
- A pot spinning method using a cylindrical pot is well known as a spinning method. In a pot spinning method described in Patent Document 1 (
JP H11-256434 - When yarn breakage occurs for one of several reasons during spinning, a cutting blade of a yarn-loosening member is brought into contact with the cake formed on the inner wall of the pot in order to lift the yarn up from the cake, whereby rewinding of the yarn onto the bobbin is started anew.
-
US 6 109 014 A relates to a method and a device for initiating the rewinding process after a yarn break in single stage pot spinning. In the process, a yarn detaching device is introduced into a spinning centrifuge rotating a high rpm, and places a cutting edge against the conically wound portion of a spinning cake deposited on the inner wall of the spinning centrifuge. The yarn detaching device has a yarn guide device, whose yarn guide contour covers the cutting edge of the yarn detaching device such that in the course of the initiation of the rewinding process lower winding layers of the conically wound portion are lifted on the rewinding tube and in this way dependably prevents the winding of yarn around the yarn detaching device during the rewinding process. - With the pot spinning method described in
Patent Document 1, however, a problem occurs in that when the cutting blade is brought into contact with the cake, yarn on a lower layer of the cake is lifted up together with the yarn on the uppermost layer of the cake such that a plurality of yarn layers are rewound onto the bobbin together, leading to a defect known as multilayer rewinding. When multilayer rewinding occurs, a large amount of yarn becomes entangled on the bobbin, and this yarn cannot be unraveled during subsequent processes. - The present invention has been designed to solve the problem described above, and an object thereof is to provide a rewinding method employed in a pot spinning machine following yarn breakage, with which the occurrence frequency of multilayer rewinding can be reduced.
- The above-mentioned problem is solved by a rewinding method according to
claim 1. Advantageous developments are subject-matters of the dependent claims. A rewinding method employed in a pot spinning machine following yarn breakage according to the present invention includes a cake forming step of forming a cake by rotating a pot having an opening and winding yarn drawn out to a predetermined thickness around an inner wall of the pot, an end of the cake detecting step of detecting a lower end of the cake on the opening side when yarn breakage is detected by a yarn breakage detection unit before completion of the cake forming step, a bobbin disposing step of disposing a bobbin inside the pot through the opening after yarn breakage is detected, and a contact step of bringing an elongated member into contact with the inner wall of the pot through the opening, closer to the opening than the lower end of the cake detected in the end of the cake detecting step. -
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FIG. 1 is a schematic view showing configurational example of an upper portion of a pot spinning machine according to an embodiment of the present invention; -
FIG. 2 is a schematic view showing configurational example of a lower portion of the pot spinning machine according to this embodiment of the present invention; -
FIG. 3 is a block diagram showing configurational example of a drive control system of the pot spinning machine according to this embodiment of the present invention; -
FIG. 4 is a view showing a basic flow of a pot spinning method according to this embodiment of the present invention; -
FIG. 5 is a view illustrating an operation of a yarn guide shown inFIG. 1 ; -
FIG. 6 is a view illustrating an operation of the yarn guide shown inFIG. 1 during a cake forming step; -
FIG. 7 is a view illustrating operation timings of a bobbin rail and an elongated member according to this embodiment of the present invention; -
FIG. 8 is a sectional view illustrating a first state of rewinding according to this embodiment of the present invention; -
FIG. 9 is a sectional view illustrating a second state of rewinding according to this embodiment of the present invention; -
FIG. 10 is an enlarged view illustrating the operation timing of the bobbin rail shown inFIG. 7 and an operation timing of a solenoid; -
FIG. 11 is a sectional view illustrating a third state of rewinding according to this embodiment of the present invention; -
FIG. 12 is a sectional view illustrating a fourth state of rewinding according to this embodiment of the present invention; and -
FIG. 13 is a sectional view illustrating a fifth state of rewinding according to this embodiment of the present invention. - Embodiments of the present invention will be described in detail below with reference to the figures.
- First, a pot spinning machine according to an embodiment of the present invention will be described.
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FIG. 1 is a schematic view showing configurational example of an upper portion, above a pot, of the pot spinning machine according to this embodiment of the present invention. - As shown in
FIG. 1 , apot spinning machine 1 includes adrafting device 10, ayarn guide 11, apot 12, and abobbin support 13. Note that these constituent elements together constitute a single spindle, which serves as a single spinning unit. Thepot spinning machine 1 includes a plurality of spindles, but with reference toFIG. 1 , the configuration of one of the plurality of spindles will be described. - A drafting device is provided above the
pot 12. - The
drafting device 10 is a device for drawing out a yarn material such as roving to a predetermined thickness. Thedrafting device 10 is formed using a plurality of roller pairs constituted by aback roller pair 15, amiddle roller pair 16, and afront roller pair 17. The plurality of roller pairs are arranged in order of theback roller pair 15, themiddle roller pair 16, and thefront roller pair 17 from an upstream side toward a downstream side in a conveyance direction of the yarn material. - The respective roller pairs 15, 16, 17 rotate when driven by a drafting drive unit, to be described below. When rotation frequencies per unit time (rpm) of the
respective roller pairs middle roller pair 16 is higher than the rotation frequency of theback roller pair 15, and the rotation frequency of thefront roller pair 17 is higher than the rotation frequency of themiddle roller pair 16. Hence, therespective roller pairs drafting device 10 draws the yarn material out thinly. In the following description, the rotation frequencies of the roller pairs will also be referred to as rotation speeds. The rotation frequency and the rotation speed of each roller pair have a mutual corresponding relationship. - The
yarn guide 11guides yarn 18 drawn out to the predetermined thickness by thedrafting device 10 into thepot 12. Theyarn guide 11 is formed in the shape of a long, narrow tube. Theyarn guide 11 has a circular shape on a cross-section cut in an orthogonal direction to a length direction thereof. - The
yarn guide 11 is disposed coaxially with thepot 12 on the downstream side of thedrafting device 10. A lower portion of theyarn guide 11 is inserted into thepot 12. Theyarn guide 11 guides theyarn 18, which is supplied from thefront roller pair 17 through ayarn supply pipe 14, into thepot 12. Theyarn 18 drawn out by thedrafting device 10 is pulled into theyarn supply pipe 14 using a swirling flow of air, for example, and then introduced into theyarn guide 11 through theyarn supply pipe 14. Theyarn 18 introduced into theyarn guide 11 is spun from alower end 11a of theyarn guide 11. Theyarn guide 11 is provided to be movable in a vertical direction by a yarn guide drive unit, to be described below. - A
yarn sensor 19 is disposed between thefront roller pair 17 and theyarn supply pipe 14. Note that the yarn sensor may be disposed in another desired position rather than between thefront roller pair 17 and theyarn supply pipe 14. Theyarn sensor 19 is a sensor for detecting the state of the yarn drawn out by thedrafting device 10. In this embodiment, yarn breakage is used as an example of a state of the yarn detected by theyarn sensor 19. Further, in this embodiment, theyarn sensor 19 is formed using an optical sensor combining a light-emitting device 19a and a light-receivingdevice 19b, for example. Theyarn sensor 19 constitutes a yarn breakage detection unit. - The
pot 12 is used to form acake 28 and rewind the yarn. Thepot 12 is formed in a cylindrical shape. Thepot 12 is provided to be capable of rotating about a central axis K of thepot 12. The central axis K of thepot 12 is disposed parallel to the vertical direction. Accordingly, one side of the central axis direction of thepot 12 is an upward side and the other side is a downward side. - The
pot 12 rotates when driven by a pot driving unit, to be described below. A yarnguide insertion port 21 is formed in an upper end side of thepot 12. The yarnguide insertion port 21 is an opening through which theyarn guide 11 is inserted into thepot 12. Anopening 23 is formed in a lower end of thepot 12. The yarnguide insertion port 21 opens upward and has a smaller diameter than a diameter (referred to hereafter as a "pot inner diameter") that defines an inner volume of thepot 12 and is based on the position of aninner wall 22. Theopening 23 opens downward and has a diameter identical to the pot inner diameter. -
FIG. 2 is a schematic view showing configurational example of a lower portion, below the pot, of the pot spinning machine according to this embodiment of the present invention. - A
cylindrical bobbin 25 carried on abobbin rail 26, thepot 12, which is capable of housing thebobbin 25, a filler (an elongated member) 73, and awagon unit 75 are provided in the lower portion of thepot spinning machine 1. Thebobbin 25 and theelongated member 73 are each provided in a plurality corresponding to the number of spindles along thebobbin rail 26. - The
bobbin rail 26 is configured to be elevatable in a vertical direction. Aslide pipe 71 is provided below thebobbin rail 26 so as to extend along thebobbin rail 26. Theslide pipe 71 is supported by aslider guide 72 fixed to thebobbin rail 26 to be capable of moving in a horizontal direction along thebobbin rail 26. Theelongated members 73 having an elongated shape are passed through thebobbin rail 26 and supported on theslide pipe 71 by supporting means, not shown in the figure, to be free to move vertically. - A
solenoid 74 is provided on theslide pipe 71. When thesolenoid 74 is switched ON, theslide pipe 71 moves in the extension direction of thebobbin rail 26 so that theelongated members 73 all move together in the horizontal direction along thebobbin rail 26. - The
wagon unit 75 travels along thebobbin rail 26 below theelongated members 73. Further, thewagon unit 75 lifts up a desiredelongated member 73 using a push-uparm 76 that is raised and lowered by a servo motor, not shown in the figure. After theelongated member 73 has been lifted up by thewagon unit 75, theelongated member 73 is positioned inside thepot 12 by the raising operation of thebobbin rail 26. -
FIG. 3 is a block diagram showing configurational example of a drive control system of the pot spinning machine according to this embodiment of the present invention. - As shown in
FIG. 3 , thepot spinning machine 1 includes a control unit 51, a draftingdrive unit 52, a yarnguide drive unit 53, apot drive unit 54, abobbin drive unit 55, a rewinding meansdrive unit 56, thesolenoid 74, and thewagon unit 75. - The control unit 51 performs overall control of all of the operations of the
pot spinning machine 1. The draftingdrive unit 52, the yarnguide drive unit 53, thepot drive unit 54, thebobbin drive unit 55, the rewinding meansdrive unit 56, thesolenoid 74, and thewagon unit 75 are electrically connected to the control unit 51 as operational control objects. Theyarn sensor 19 is also electrically connected to the control unit 51. When yarn breakage occurs in thedrafting device 10, theyarn sensor 19 outputs a yarn breakage occurrence signal informing the control unit 51 of the yarn breakage. - The drafting
drive unit 52 rotates theback roller pair 15, themiddle roller pair 16, and thefront roller pair 17 at the respective predetermined rotation frequencies thereof. The draftingdrive unit 52 rotates theback roller pair 15, themiddle roller pair 16, and thefront roller pair 17 by implementing driving on the basis of a drafting drive signal applied to the draftingdrive unit 52 from the control unit 51. - The yarn
guide drive unit 53 operates theyarn guide 11. The yarnguide drive unit 53 operates theyarn guide 11 to move in the vertical direction. The yarnguide drive unit 53 moves theyarn guide 11 in the vertical direction by implementing driving on the basis of a yarn guide drive signal applied to the yarnguide drive unit 53 from the control unit 51. - The
pot drive unit 54 rotates thepot 12. Thepot drive unit 54 rotates thepot 12 using the central axis K of thepot 12 as a rotational center by implementing driving on the basis of a pot drive signal applied thereto from the control unit 51. - The
bobbin drive unit 55 operates thebobbin 25. Thebobbin drive unit 55 operates thebobbin 25 mounted on thebobbin mounting portion 27 of thebobbin support 13 to move in the vertical direction integrally with thebobbin support 13 and thebobbin rail 26. Thebobbin drive unit 55 moves thebobbin 25 in the vertical direction by implementing driving on the basis of a bobbin drive signal applied thereto from the control unit 51. - The rewinding means
drive unit 56 operates rewinding means, not shown in the figures, during normal rewinding. The rewinding meansdrive unit 56 operates the rewinding means by implementing driving on the basis of a rewinding means drive signal applied thereto from the control unit 51. - Next, a pot spinning method according to this embodiment of the present invention will be described.
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FIG. 4 is a view showing a basic flow of the pot spinning method. - As shown in
FIG. 4 , during a spinning operation, the pot spinning method includes an end of the cake detecting step S1 and an elongated member position adjusting step S2. Further, during a rewinding operation, the pot spinning method includes a bobbin disposing step S3, a contact step S4, a moving step S5, an elongated member withdrawing step S6, a bobbin disposing step S3A, and a rewinding means driving step S7. - The end of the cake detecting step S1 is a step of detecting a cake
lower end 28b (seeFIG. 1 ) of thecake 28 following yarn breakage. The elongated member position adjusting step S2 is a step of adjusting the position of theelongated member 73 corresponding to the spindle in which the yarn breakage has been detected. The rewinding operation includes yarn breakage rewinding using theelongated member 73 corresponding to the spindle in which yarn breakage has occurred, and normal rewinding using the rewinding means corresponding to the spindles in which yarn breakage has not occurred. Yarn breakage rewinding is performed after the bobbin disposing step S3 and includes the contact step S4, the moving step S5, and the elongated member withdrawing step S6. The bobbin disposing step S3 is a step of inserting thebobbin 25 into the interior of thepot 12 and disposing thebobbin 25 in a position for starting rewinding. The contact step S4 is a step of pushing theelongated member 73 against theinner wall 22 of thepot 12 below the cakelower end 28b. The moving step S5 is a step of moving theelongated member 73 toward the cakelower end 28b. The elongated member withdrawing step S6 is a step of withdrawing theelongated member 73 to its original position. During normal rewinding, which is performed after the bobbin disposing step S3A, the yarn is rewound onto thebobbin 25 by driving the rewinding means in the rewinding means driving step S7. Operations of thepot spinning machine 1 based on the respective steps will be described below. - It is assumed that before the
pot spinning machine 1 is operated, theyarn guide 11 has been disposed near theyarn supply pipe 14, thebobbin 25 has been mounted on thebobbin mounting portion 27 of thebobbin support 13, and thebobbin 25 has been disposed below and away from thepot 12. - First, a drawing-out operation is performed using the
drafting device 10, as shown inFIG. 1 . The draftingdrive unit 52 rotates theback roller pair 15, themiddle roller pair 16, and thefront roller pair 17 at the respective predetermined rotation speeds thereof by implementing driving on the basis of the drafting drive signal applied thereto from the control unit 51. As a result, the yarn material, such as roving, is conveyed by the rotation of the respective roller pairs 15, 16, 17. - At this time, the control unit 51 sets the rotation speed of the
back roller pair 15 at a lower speed than the rotation speed of themiddle roller pair 16 and sets the rotation speed of themiddle roller pair 16 at a lower speed than the rotation speed of thefront roller pair 17. Accordingly, the yarn is drawn out between theback roller pair 15 and themiddle roller pair 16 by the rotation speed difference between these roller pairs. Similarly, the yarn is drawn out between themiddle roller pair 16 and thefront roller pair 17 by the rotation speed difference between these roller pairs. - As a result, the yarn material, such as roving, is drawn out to the predetermined thickness while passing in order through the
back roller pair 15, themiddle roller pair 16, and thefront roller pair 17. Theyarn 18 drawn out in this manner is then pulled into theyarn supply pipe 14 using a swirling flow of air and then introduced into theyarn guide 11. - Further, before the start of the drawing-out operation, the control unit 51 applies the pot driving signal to the
pot drive unit 54 to rotate thepot 12 at a predetermined rotation frequency. - Next, the cake-forming step is performed using the
yarn guide 11 and thepot 12. The yarnguide drive unit 53 moves theyarn guide 11 by a predetermined amount downward by implementing driving on the basis of the yarn guide drive signal applied thereto from the control unit 51. Further, thepot drive unit 54 continues to rotate thepot 12 by implementing driving on the basis of the pot drive signal applied thereto from the control unit 51. Note that when theyarn guide 11 is moved downward, theyarn guide 11 is in a positon removed from theyarn supply pipe 14. Further, theyarn 18 introduced into theyarn guide 11 from theyarn supply pipe 14 is spun from thelower end 11a of theyarn guide 11. - Centrifugal force generated by the rotation of the
pot 12 acts on theyarn 18 spun from thelower end 11a of theyarn guide 11, and as a result of this centrifugal force, theyarn 18 is pressed into contact with theinner wall 22 of thepot 12. Further, theyarn 18 pressed against theinner wall 22 of thepot 12 is twisted by the rotation of thepot 12. As a result, theyarn 18 spun from thelower end 11a of theyarn guide 11 is wound around theinner wall 22 of thepot 12 in a state where twist is applied thereto by the rotation of thepot 12. - Furthermore, as shown in
FIG. 5 , by implementing driving on the basis of the yarn guide drive signal, the yarnguide drive unit 53 displaces the position of theyarn guide 11 relatively downward while moving theyarn guide 11 in a vertical reciprocating motion repeatedly at predetermined intervals. As a result, thecake 28 is formed on theinner wall 22 of thepot 12. Thecake 28 is a laminated body formed from theyarn 18 wound around theinner wall 22 of thepot 12. -
FIG. 6 is a view illustrating the operation of the yarn guide during the cake-forming step. The vertical axis of the figure shows the position of the yarn guide in the pot central axis direction, and the horizontal axis shows time. - In
FIG. 6 , first, theyarn guide 11 descends to a P1 position, then ascends to a P2 position, then descends to a P3 position, and then ascends to a P4 position. In other words, theyarn guide 11 repeatedly performs a vertical reciprocating motion. In this case, a period T1 from the point at which theyarn guide 11 reaches the P1 position to the point at which theyarn guide 11 reaches the P3 position and a period T2 from the point at which theyarn guide 11 reaches the P2 position to the point at which theyarn guide 11 reaches the P4 position each serve as one period. Further, to displace the position of theyarn guide 11 relatively downward, the P3 position is set to be lower than the P1 position and the P4 position is set to be lower than the P2 position. A vertical deviation H1 between the P1 position and the P3 position and a vertical deviation H2 between the P2 position and the P4 position each serve as a displacement step amount of theyarn guide 11 during one period. In other words, theyarn guide 11 is displaced downward by one fixed displacement step amount at a time while performing a vertical reciprocating motion repeatedly at fixed period intervals. This operation of theyarn guide 11 continues until theyarn guide 11 reaches a Pm position. In this case, the P1 position defines a winding start-side end (also referred to hereafter as a "cake upper end") 28a of thecake 28 shown inFIG. 1 , while the Pm position defines a winding end-side end (also referred to hereafter as a "cake lower end") 28b of thecake 28 shown in the same figure. - The control unit 51 operates the
yarn guide 11, as shown inFIGS. 5 and6 , by applying the yarn guide drive signal to the yarnguide drive unit 53. As a result, thecake 28 is formed on theinner wall 22 of thepot 12 in the shape shown inFIG. 5 . In this embodiment, the following step is further included after thecake 28 is formed by the operation of theyarn guide 11 in the cake-forming step. - After the
yarn guide 11 reaches the Pm position, the control unit 51 moves theyarn guide 11 downward by a predetermined amount Lh. As a result, as shown inFIG. 5 , the portion of theyarn 18a that serves as the rewinding start point for rewinding the yarn onto thebobbin 25 is wound around theinner wall 22 of thepot 12 in theregion 22a closer to theopening 23 side than the cakelower end 28b of thecake 28. The portion of theyarn 18a may be wound in a single layer or a plurality of layers. When the portion of theyarn 18a is wound in a single layer, yarn cutting may be performed at a stage where theyarn guide 11 is lowered from the Pm position to a Pn position. Further, when the portion of theyarn 18a is wound in a plurality of layers, yarn cutting may be performed at a stage where an operation for lowering theyarn guide 11 from the Pm position to the Pn position and then raising theyarn guide 11 to a higher position than the Pn position has been performed at least once. - Here, the difference between "yarn cutting" and "yarn breakage" will be described.
- Yarn cutting is performed intentionally at the stage where the
yarn 18 is wound around theinner wall 22 of thepot 12 in a predetermined amount set in advance. Yarn breakage, on the other hand, is a phenomenon whereby theyarn 18 breaks for one of various reasons before being wound around theinner wall 22 of thepot 12 in the predetermined amount. - Yarn cutting is performed under the control of the control unit 51. More specifically, the control unit 51 controls the driving implemented by the drafting
drive unit 52 so that rotation of both theback roller pair 15 and themiddle roller pair 16 is stopped while thefront roller pair 17 continue to rotate. As a result, theyarn 18 is forcibly cut on the downstream side of themiddle roller pair 16. - When yarn breakage occurs before the cake forming step is complete, the end of the cake detecting step S1 is performed. The end of the cake detecting step S1 is performed on each
pot 12 in which yarn breakage has occurred. When yarn breakage is detected by theyarn sensor 19, a yarn breakage occurrence signal is output to the control unit 51. At this time, the control unit 51 detects the position of the cakelower end 28b of thecake 28 from the input timing of the yarn breakage occurrence signal. As shown inFIG. 6 , when yarn breakage occurs above P1 during a period T1 extending from the point at which theyarn guide 11 reaches the P1 position to the point at which theyarn guide 11 reaches the P3 position, for example, P1 serves as the cakelower end 28b, and when yarn breakage occurs during the descent from P1 to P3, the position of theyarn guide 11 at the time of the yarn breakage serves as the cakelower end 28b. Thus, the control unit 51 detects the position of the cakelower end 28b within thepot 12 by determining the period including the input timing of the yarn breakage occurrence signal. - Note that in the
pot 12 in which the yarn breakage occurs, formation of thecake 28 is not continued, whereas in thepots 12 in which yarn breakage has not occurred, thecakes 28 are formed until the cake forming step is complete. - Next, in the elongated member position adjusting step S2, the control unit 51 inputs a drive signal into the wagon unit 75 (see
FIG. 2 ) to cause thewagon unit 75 to travel to the position of thepot 12 in which the yarn breakage has occurred. Having reached the position of thepot 12 in which the yarn breakage has occurred, thewagon unit 75 lifts up theelongated member 73 by raising the push-uparm 76 in response to input of a drive signal from the control unit 51. At this time, as shown inFIG. 7 , when theelongated member 73 is lifted up at a time U1, the height of theelongated member 73 is raised from A0, at which a tip end of theelongated member 73 is in an initial position, to A1, which is several millimeters below the cakelower end 28b (seeFIG. 5 ) in the contact step S4, to be described below. Once theelongated member 73 has been lifted up, the push-uparm 76 is lowered. The height of theelongated member 73 is maintained by supporting means, not shown in the figure. - The rewinding operation is performed when the cake forming step is complete. Note that
FIGS. 8 ,9 , and11 to 13 , to be described below, show thepot 12 in which the yarn breakage was detected during the end of the cake detecting step S1. - The bobbin disposing step S3 is performed on the
pot 12 in which the yarn breakage was detected in the cake forming step. In the bobbin disposing step S3, thebobbin 25 is disposed inside thepot 12 through theopening 23 by the driving implemented by the pot drive unit 54 (seeFIG. 3 ). Thepot drive unit 54 continues to rotate thepot 12 by implementing driving on the basis of the pot drive signal applied thereto from the control unit 51. Thebobbin drive unit 55 moves thebobbin support 13 upward by implementing driving on the basis of the bobbin drive signal applied thereto from the control unit 51. Accordingly, thebobbin 25 mounted on the bobbin mounting portion 27 (seeFIG. 1 ) moves up together with thebobbin support 13 to several mm below a highest point, as shown inFIG. 9 , to be described below. More specifically, as shown inFIG. 7 , from a time U2 to a time U3, the height of thebobbin rail 26 is raised from an initial position B0 to B1, which is several mm below the highest point of thebobbin rail 26. - Further, as shown in
FIGS. 8 and9 , thebobbin 25 is inserted into thepot 12 through theopening 23 of thepot 12. Meanwhile, the yarnguide drive unit 53 moves theyarn guide 11 upward by implementing driving on the basis of the yarn guide drive signal applied thereto from the control unit 51. As a result, before thebobbin 25 enters thepot 12, thelower end 11a of theyarn guide 11 retreats to a position inside thepot 12 where theyarn guide 11 does not contact thebobbin 25. - Furthermore, in the
pot 12 in which the yarn breakage was detected during the end of the cake detecting step S1, theelongated member 73 is lifted up to A1, as shown inFIG. 7 , and therefore, as shown inFIG. 9 , theelongated member 73 enters thepot 12 together with thebobbin 25 and rises to a height of A2. - When yarn breakage occurs during the cake forming step, the portion of the
yarn 18a is not formed normally, and therefore rewinding cannot be performed by normal rewinding. In thepot 12 where the yarn breakage has occurred, however, the yarn end of the broken yarn is, in many cases, positioned below thecake 28 and pressed against theinner wall 22 of thepot 12 by the centrifugal force. Hence, yarn breakage rewinding is performed as described below. - In yarn breakage rewinding, first, the contact step S4 is performed. As shown in
FIG. 7 and the enlarged view inFIG. 10 , when the solenoid 74 (seeFIG. 2 ) is switched ON on the basis of a solenoid drive signal applied thereto from the control unit 51 at the time U3, theslide pipe 71 moves along thebobbin rail 26. Accordingly, the respectiveelongated members 73 move along thebobbin rail 26 in the horizontal direction. Further, as shown inFIG. 11 , in thepot 12 in which the yarn breakage was detected during the end of the cake detecting step S1, theelongated member 73 is lifted up in advance, and therefore theelongated member 73 is pressed into contact with theinner wall 22 of thepot 12. At this time, the height of the tip end of theelongated member 73 is several mm below the lower end of thecake 28. - By pressing the
elongated member 73 against theinner wall 22 of thepot 12 so that the height of the tip end of theelongated member 73 is several mm below the lower end of thecake 28, the end of the broken yarn inside thepot 12 contacts theelongated member 73 and starts to coil around thebobbin 25 disposed on the central axis K (seeFIG. 1 ) of thepot 12. In many cases, therefore, by implementing the contact step S4 on thepot 12 in which the yarn breakage has occurred, rewinding onto thebobbin 25 can be started using the end of the broken yarn inside thepot 12 as a rewinding start point. - Next, the moving step S5 is performed. As shown in
FIGS. 7 and12 , thebobbin drive unit 55 moves thebobbin rail 26 upward to the highest point B2 by implementing driving on the basis of the bobbin drive signal applied thereto from the control unit 51. Accordingly, thebobbin 25 and theelongated member 73 ascend. Theelongated member 73 moves upward by a distance X from the height A2 to A3 while remaining pressed against theinner wall 22 of thepot 12. As a result, the tip end of theelongated member 73 is pressed into contact with the cakelower end 28b of thecake 28. - Even in a case where the end of the broken yarn is not positioned at the height A2 so that the
yarn 18 cannot be rewound onto thebobbin 25 in the contact step S4, the tip end of theelongated member 73 is brought into contact with the yarn end in the moving step S5, and therefore yarn breakage rewinding can be started using the yarn on the uppermost layer of the cakelower end 28b, of the yarn forming thecake 28, as the rewinding start point. - In the rewinding method following yarn breakage described in
Patent Document 1, the cutting blade is brought into contact with the cake, and therefore yarn on a lower layer of the cake is lifted up together with the yarn on the uppermost layer of the cake such that multilayer rewinding occurs. In this embodiment, on the other hand, the height of the cakelower end 28b is detected in the end of the cake detecting step S1, whereupon the tip end of theelongated member 73 is brought into contact with the cakelower end 28b in the moving step S5, and therefore a plurality of layers of the yarn forming thecake 28 are not lifted up at the same time. As a result, multilayer rewinding can be suppressed. - When a preset time U4 arrives, the
solenoid 74 is switched OFF, as shown inFIG. 10 , on the basis of a solenoid drive signal applied thereto from the control unit 51. As a result, theelongated member 73 returns to its original position in the horizontal direction, whereby theelongated member 73 separates from theinner wall 22, as shown inFIG. 13 . - When all of the yarn forming the
cake 28 has been rewound onto thebobbin 25 at a time U5, as shown inFIG. 7 , the elongated member withdrawing step S6 is performed. The control unit 51 lowers thebobbin rail 26 by applying the bobbin drive signal to thebobbin drive unit 55. Next, at a time U6, the control unit 51 raises and lowers the push-uparm 76 in order to lower the raisedelongated member 73 by applying a drive signal to thewagon unit 75 shown inFIG. 2 . As a result, yarn breakage rewinding is complete. - Further, in each of the
pots 12 in which yarn breakage is not detected during the cake forming step, the bobbin disposing step S3A is performed for the purpose of normal rewinding, as shown inFIG. 4 . The bobbin disposing step S3A includes identical operations to the bobbin disposing step S3 described above, and is performed simultaneously with the bobbin disposing step S3. - Next, the rewinding means driving step S7 (see
FIG. 4 ) is performed. When the rewinding means, not shown in the figures, contacts the portion of theyarn 18a (seeFIG. 5 ), the portion of theyarn 18a starts to coil around thebobbin 25 disposed on the central axis K (seeFIG. 1 ) of thepot 12. Thus, in thepots 12 in which yarn breakage has not occurred, rewinding onto thebobbin 25 can be started using the portion of theyarn 18a discharged into thepot 12 as the rewinding start point. - As a result of the operations described above, the
bobbin 25 is obtained with a yarn tube wound thereon. Thebobbin 25 with the yarn tube wound thereon is removed from thebobbin mounting portion 27. Anempty bobbin 25 is then mounted on thebobbin mounting portion 27, whereupon similar operations to those described above are performed. - Hence, by providing the cake forming step of forming the
cake 28 by rotating thepot 12 having theopening 23 and winding theyarn 18 drawn out to a predetermined thickness around theinner wall 22 of thepot 12, the end of the cake detecting step S1 for detecting the cakelower end 28b on the opening side of thecake 28 when breakage of theyarn 18 is detected by the yarn breakage detection unit before completion of the cake forming step, the bobbin disposing step S3 for disposing thebobbin 25 inside thepot 12 through theopening 23 following completion of the cake forming step, and the contact step S4 for bringing theelongated member 73 into contact with theinner wall 22 of thepot 12 through theopening 23, closer to the opening side than the cakelower end 28b of the cake, detected in the end of the cake detecting step S1, the occurrence frequency of multilayer rewinding can be reduced. - Further, the moving step S5 is provided after the contact step S4 to raise the
elongated member 73 while keeping theelongated member 73 in contact with theinner wall 22 of thepot 12 so that theelongated member 73 contacts the cakelower end 28b on the opening side of thecake 28. Hence, rewinding can be started from the cakelower end 28b even when theyarn 18 cannot be rewound onto thebobbin 25 in the contact step S4, and as a result, the occurrence frequency of multilayer rewinding can be reduced. - Furthermore, in the end of the cake detecting step S1, the position of the cake
lower end 28b is detected on the basis of the detection timing of the yarn breakage, and therefore the position of the cakelower end 28b can be detected by a simple method. Moreover, the tip end of theelongated member 73 is brought into contact with the cakelower end 28b, and therefore multilayer rewinding can be suppressed. - Further, the cake
lower end 28b of thecake 28 is used as the rewinding start point, and therefore the occurrence frequency of multilayer rewinding can be reduced without greatly modifying the configuration of the pot from that of a pot of a conventional pot spinning machine. - Furthermore, the
pot 12 is provided in a plurality, and in the contact step S4, theelongated members 73 are brought into contact with theinner walls 22 of the plurality ofpots 12 simultaneously. Therefore, the time required to implement the entire spinning method is shortened in comparison with a method in which thepots 12 in which yarn breakage occurs are rewound one at a time, and as a result, an improvement in productivity is achieved. - Note that in this embodiment, the pot spinning method includes the moving step S5, but the moving step S5 does not have to be included. Through experiment, it was found that in many cases, the yarn that serves as the rewinding start point following yarn breakage is pressed against the
inner wall 22 of thepot 12 on theopening 23 side of the cakelower end 28b, and therefore the yarn can be rewound by pressing theelongated member 73 against theinner wall 22 in the contact step S4. - Further, in this embodiment, the
bobbin 25 that can be applied to ring spinning is used, but the present invention may be implemented using a different bobbin. - Furthermore, in this embodiment, the
yarn sensor 19 constituted by an optical sensor is used, but a yarn sensor employing a different detection system may be used. For example, a mechanical yarn sensor that detects yarn breakage mechanically through contact with the yarn may be used. - Moreover, in this embodiment, the
elongated member 73 is brought into contact with the cakelower end 28b, but instead, the elongated member may be brought into contact with the cakeupper end 28a. - Furthermore, a different cake-forming step (a step such as that disclosed in
Japanese Patent Application Publication Laid-Open No. H04-308227 FIG. 6 may be performed.
Claims (4)
- A rewinding method employed in a pot spinning machine (1) following yarn breakage, the rewinding method comprising:a cake forming step of forming a cake (28) by rotating a pot (12) having an opening (23) and winding yarn (18) drawn out to a predetermined thickness around an inner wall (22) of the pot (12); characterized byan end of the cake detecting step (S1) of detecting a lower end (28b) of the cake (28) on the opening side when yarn breakage is detected by a yarn breakage detection unit (19) before completion of the cake forming step;a bobbin disposing step (S3) of disposing a bobbin (25) inside the pot (12) through the opening (23) after yarn breakage is detected; anda contact step (S4) of bringing an elongated member (73) into contact with the inner wall (22) of the pot (12) through the opening (23), closer to the opening (23) than the lower end (28b) of the cake (28) detected in the end of the cake detecting step (S1).
- The rewinding method employed in a pot spinning machine (1) following yarn breakage according to claim 1, further comprising, after the contact step (S4), a moving step (S5) of raising the elongated member (73) while keeping the elongated member (73) in contact with the inner wall (22) of the pot (12) so that the elongated member (73) contacts the end of the cake (28) on the opening (23) side.
- The rewinding method employed in a pot spinning machine (1) following yarn breakage according to claim 1 or 2, wherein, in the end of the cake detecting step (S1), the position of the end of the cake (28) is detected on the basis of a detection timing of the yarn breakage.
- The rewinding method employed in a pot spinning machine (1) following yarn breakage according to any one of claims 1 to 3, wherein, when the pot (12) is provided in a plurality, in the contact step (S4), the elongated members (73) are brought into contact with the inner walls (22) of the plurality of pots (12) simultaneously.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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JP2018025876A JP6992574B2 (en) | 2018-02-16 | 2018-02-16 | Rewinding method in a pot spinning frame |
Publications (2)
Publication Number | Publication Date |
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EP3527701A1 EP3527701A1 (en) | 2019-08-21 |
EP3527701B1 true EP3527701B1 (en) | 2022-04-13 |
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EP19155224.9A Active EP3527701B1 (en) | 2018-02-16 | 2019-02-04 | Rewinding method employed in pot spinning machine following yarn breakage |
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EP (1) | EP3527701B1 (en) |
JP (1) | JP6992574B2 (en) |
CN (1) | CN110158204B (en) |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4103771A1 (en) | 1991-02-08 | 1992-08-13 | Schlafhorst & Co W | METHOD AND DEVICE FOR PRODUCING A THREAD BY CENTRIFUGAL SPINNING |
DE4426897B4 (en) * | 1994-07-29 | 2005-09-01 | Saurer Gmbh & Co. Kg | A method for rewinding a spun cake in a pot spinning device |
DE19523835A1 (en) * | 1995-06-30 | 1997-01-02 | Schlafhorst & Co W | Yarn pot spinning giving earlier indication of deviations in yarn |
DE19802656A1 (en) * | 1998-01-24 | 1999-07-29 | Schlafhorst & Co W | Operation for starting rewinding process at a centrifugal spinner after yarn breakage |
EP0931864B1 (en) * | 1998-01-24 | 2001-08-01 | W. SCHLAFHORST AG & CO. | Method and device to initiate the rewind operation after a yarn break during centrifugal spinning |
DE10211862A1 (en) * | 2002-03-18 | 2003-10-02 | Schlafhorst & Co W | Centrifugal spinning device |
DE10211850A1 (en) * | 2002-03-18 | 2003-10-02 | Schlafhorst & Co W | Method for operating a spinning device |
DE10318317A1 (en) * | 2003-04-19 | 2004-10-28 | Saurer Gmbh & Co. Kg | Textile spinning assembly can-change triggered by the absolute position of the thread guide as confirmed by a sensor linked to a control unit |
WO2009127074A1 (en) * | 2008-04-15 | 2009-10-22 | Maschinenfabrik Rieter Ag | Method and device for producing a roving |
JP5796558B2 (en) * | 2012-09-05 | 2015-10-21 | 株式会社豊田自動織機 | Spinning yarn detection device |
-
2018
- 2018-02-16 JP JP2018025876A patent/JP6992574B2/en active Active
-
2019
- 2019-02-04 EP EP19155224.9A patent/EP3527701B1/en active Active
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CN110158204A (en) | 2019-08-23 |
EP3527701A1 (en) | 2019-08-21 |
JP6992574B2 (en) | 2022-01-13 |
JP2019143252A (en) | 2019-08-29 |
CN110158204B (en) | 2022-05-27 |
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