EP3623506B1 - Verfahren zur steuerung einer topfspinnmaschine - Google Patents

Verfahren zur steuerung einer topfspinnmaschine Download PDF

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Publication number
EP3623506B1
EP3623506B1 EP19191654.3A EP19191654A EP3623506B1 EP 3623506 B1 EP3623506 B1 EP 3623506B1 EP 19191654 A EP19191654 A EP 19191654A EP 3623506 B1 EP3623506 B1 EP 3623506B1
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EP
European Patent Office
Prior art keywords
pot
yarn
pair
rollers
spindle
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.)
Active
Application number
EP19191654.3A
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English (en)
French (fr)
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EP3623506A1 (de
Inventor
Toshiki Kondo
Yusuke Nakamura
Daisuke Tsuchida
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Toyota Industries Corp
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Toyota Industries Corp
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Publication date
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Publication of EP3623506A1 publication Critical patent/EP3623506A1/de
Application granted granted Critical
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    • 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
    • D01H13/14—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements

Definitions

  • the present disclosure relates to a method for controlling a pot spinning machine.
  • a pot spinning machine yarn that has been drawn out by a drafting device is introduced to a pot by a yarn introduction pipe, and the introduced yarn is spun through an end of the yarn introduction pipe to be deposited on an inside wall of the pot, and the yarn is then rewound onto a bobbin. If rewinding of the yarn fails for any reason, the yarn supposed to be rewound onto the bobbin remains in the pot at the end of a rewinding step.
  • the yarn that remains in the pot at the end of the rewinding step is referred to as "remaining yarn" herein.
  • the yarn spun in the pot in a next spinning step (hereinafter also referred to as “another yarn”) is deposited on the remaining yarn.
  • another yarn is deposited on the remaining yarn.
  • the yarn introduction pipe may contact the cake during the yarn spinning in the pot, or the bobbin inserted into the pot for yarn rewinding may contact the cake.
  • Japanese Patent Application Publication JP 2001 - 081 634 A mentions, for example, a technique to inspect whether the remaining yarn exists in the pot, through a phenomenon that the presence of the remaining yarn reduces a rotary frequency of a yarn leg which rotates around the yarn introduction pipe when the yarn is spun in the pot through the end of the yarn introduction pipe. More specifically, a rotary frequency of the yarn leg is detected during the spinning of the yarn, and the detected rotary frequency of the yarn leg is compared with a predetermined set value of the rotary frequency to inspect the presence of the remaining yarn in the pot.
  • the technique mentioned in Japanese Patent Application Publication JP 2001 - 081 634 A can detect the rotary frequency of the yarn leg only after the start of spinning of the yarn. If the remaining yarn exists in the pot, the yarn spun in the pot for detection of the frequency of the yarn leg is deposited on the remaining yarn. Accordingly, the yarn introduction pipe may contact a cake, or the bobbin may contact a cake, as described above. Further, even if the yarn could be rewound onto the bobbin, a mixture of the remaining yarn and the another yarn is rewound onto the bobbin.
  • WO 03 / 078 706 A1 discloses a spinning device according to the preamble of claim 1.
  • the present disclosure which has been made in light of the above-mentioned problem, is directed to providing a method for controlling a pot spinning machine that prevents another yarn from being deposited on the remaining yarn in a pot even if yarn rewinding fails.
  • FIG. 1 is a schematic view illustrating an exemplary configuration of a pot spinning machine according to an embodiment of the present disclosure.
  • a pot spinning machine 1 includes a drafting device 2, a roving-supply stop device 3, a yarn introduction pipe 4, a pot 5, a bobbin support part 6, and an inspection device 7. These elements cooperate to form a single spindle that represents a unit of spinning.
  • the pot spinning machine 1 includes a plurality of spindles, and each of the spindles has a common configuration. The following will focus on a configuration of the single spindle.
  • the drafting device 2 is a device that draws out a roving 9, which is a yarn material, to a predetermined thickness.
  • the drafting device 2 includes multiple pairs of rollers, such as a pair of back rollers 15, a pair of middle rollers 16, and a pair of front rollers 17.
  • the pair of back rollers 15, the pair of middle rollers 16, and the pair of front rollers 17 are arranged in that order from upstream to downstream of a roving delivery direction.
  • the pair of back rollers 15 includes a top back roller 15a and a bottom back roller 15b.
  • the top back roller 15a and the bottom back roller 15b are in contact with each other under a predetermined pressure.
  • the top back roller 15a is a driven roller, and the bottom back roller 15b is a driving roller.
  • the top back roller 15a is rotated by rotation of the bottom back roller 15b.
  • the pair of middle rollers 16 includes a top middle roller 16a and a bottom middle roller 16b.
  • the top middle roller 16a and the bottom middle roller 16b are in contact with each other under a predetermined pressure.
  • the top middle roller 16a is a driven roller, and the bottom middle roller 16b is a driving roller.
  • the top middle roller 16a is rotated by rotation of the bottom middle roller 16b.
  • the pair of middle rollers 16 is wound with a pair of aprons 19.
  • the pair of aprons 19 includes a top apron 19a and a bottom apron 19b.
  • the top apron 19a is wound over the top middle roller 16a
  • the bottom apron 19b is wound over the bottom middle roller 16b.
  • the pair of front rollers 17 includes a top front roller 17a and a bottom front roller 17b.
  • the top front roller 17a and the bottom front roller 17b are in contact with each other under a predetermined pressure.
  • the top front roller 17a is a driven roller, and the bottom front roller 17b is a driving roller.
  • the top front roller 17a is rotated by rotation of the bottom front roller 17b.
  • the pairs of rollers 15, 16, and 17 are rotated by a drafting-device driving section described later.
  • the drafting-device driving section rotates the pair of back rollers 15, the pair of middle rollers 16, and the pair of front rollers 17, at respective predetermined rotational speeds.
  • the rotational speeds of the pairs of rollers 15, 16, and 17 are defined by revolutions per minute (rpm)
  • the rpm of the pair of middle rollers 16 is greater than the rpm of the pair of back rollers 15, and the rpm of the pair of front rollers 17 is greater than the rpm of the pair of middle rollers 16.
  • the drafting device 2 draws out the roving 9 by using the rotations of the pairs of rollers 15, 16, 17, specifically, by using the difference in rpm among the pair pf rollers 15, 16, 17, that is, the difference in rotational speed among the pairs of rollers 15, 16, 17.
  • a yarn 20 that has been drawn out by the drafting device 2 to a predetermined thickness is supplied from the drafting device 2 to the yarn introduction pipe 4 through a yarn suction pipe 22.
  • the roving-supply stop device 3 includes a wedge 8 that is movable toward or away from the pair of back rollers 15 of the drafting device 2.
  • the roving-supply stop device 3 stops supply of the roving 9 to the drafting device 2 by the wedge 8 driven between the two rollers of the pair of back rollers 15, i.e., the top back roller 15a and the bottom back roller 15b.
  • the wedge 8 When the roving-supply stop device 3 is started, the wedge 8 is moved toward the pair of back rollers 15. The wedge 8 is driven between the top back roller 15a and the bottom back roller 15b. The wedge 8 blocks the transmission of the rotation of the bottom back roller 15b to the top back roller 15a. Further, the roving 9 is caught between the top back roller 15a and the wedge 8. This prevents the rotation of the bottom back roller 15b from providing a delivery force to the roving 9. This therefore stops the supply of the roving 9 to the drafting device 2.
  • the yarn introduction pipe 4 introduces the yarn 20, which has been supplied from the drafting device 2 through the yarn suction pipe 22, to the pot 5.
  • the yarn 20 drawn out by the drafting device 2 is introduced into the yarn suction pipe 22, for example, by swirling air flow, and the yarn 20 is further introduced into the yarn introduction pipe 4 through the yarn suction pipe 22.
  • the yarn introduction pipe 4 has a long thin tube-like shape.
  • the yarn introduction pipe 4 has a circular cross section in a direction perpendicular to a longitudinal direction of the yarn introduction pipe 4.
  • the yarn introduction pipe 4 is disposed downstream of the drafting device 2, and is coaxial with the pot 5. A lower portion of the yarn introduction pipe 4 is disposed in the pot 5.
  • the yarn introduction pipe 4 has a yarn outlet 4a at a bottom end of the yarn introduction pipe 4.
  • the yarn 20 introduced into the yarn introduction pipe 4 is discharged from the yarn outlet 4a of the yarn introduction pipe 4 for spinning.
  • the yarn introduction pipe 4 is moved up and down by a yarn-introduction-pipe driving section described later
  • the pot 5 is used for formation of a cake 24 and rewinding of the yarn 20.
  • the pot 5 has a cylindrical shape.
  • the pot 5 is rotatable with respect to a central axis of the pot 5.
  • the central axis of the pot 5 referred to as K is parallel to a vertical direction. Accordingly, one side of the pot 5 is an upper side, and the other side is a lower side in the central axis K direction.
  • the pot 5 is rotated by a pot driving section described later.
  • the pot 5 has an opening 5a at a bottom end of the pot 5.
  • the cake 24 is a deposit of the yarn 20 that is formed on an inside wall 5b of the pot 5.
  • the bobbin support part 6 supports a bobbin 25.
  • the bobbin support part 6 is moved up and down by a bobbin driving section described later.
  • the bobbin support part 6 includes a bobbin seat 26 and a bobbin attachment portion 27.
  • the bobbin seat 26 has a plate-like shape.
  • the bobbin attachment portion 27 is fixed to the bobbin seat 26.
  • the bobbin attachment portion 27 is a portion to which the bobbin 25 is attachable.
  • the bobbin attachment portion 27 is arranged coaxially with the yarn introduction pipe 4 and the pot 5 such that the bobbin attachment portion 27 faces the yarn introduction pipe 4 on the central axis K of the pot 5.
  • the bobbin attachment portion 27 is disposed below the yarn introduction pipe 4. Accordingly, the bobbin 25 faces the yarn introduction pipe 4 on the central axis K of the pot 5 in a state where the bobbin 25 is attached to the bobbin attachment portion 27.
  • the inspection device 7 inspects whether the remaining yarn exists in the pot 5.
  • the inspection device 7 includes a camera 31 for capturing images and an image processor 32.
  • the camera 31 captures an image of the inside of the pot 5, and outputs the captured image data.
  • the image processor 32 processes the image data output from the camera 31, and determines whether the remaining yarn exists in the pot 5.
  • the inspection device 7 including the camera 31 and the image processor 32 may include a plurality of inspection device 7 corresponding to a plurality of spindles of the pot spinning machine 1, alternatively, may be a single inspection device 7 provided for the plurality of spindles.
  • a single inspection device 7 is provided for a plurality of spindles, as an example.
  • the single inspection device 7 has to capture an image of the inside of each pot of all the spindles.
  • the inspection device 7 is mounted on a movable wagon, which is not illustrated, so as to inspect the pot 5 of each of all the spindles to determine whether the remaining yarn exists in the pot 5.
  • the plurality of spindles of the pot spinning machine 1 is arranged along a longitudinal direction of a frame of the pot spinning machine 1. Accordingly, the wagon is movable in a direction in which the plurality of spindles of the pot spinning machine 1 are arranged.
  • the wagon moves to locate the camera 31 mounted on the wagon below the pot 5 of each of the spindles, and the camera 31 captures an image of the inside of the pot 5 of the spindle in sequence.
  • the image processor 32 receives image data output from the camera 31, and processes the image data. If the remaining yarn exists in the pot 5 whose image is captured by the camera 31, the image data output from the camera 31 shows a predetermined difference in luminance at a boundary P between a surface of the inside wall 5b of the pot 5 and the remaining yarn, as illustrated in FIG. 1 .
  • the image processor 32 determines that the remaining yarn exists when the image processor 32 detects that there is a portion at which a predetermined difference in luminance is shown, meanwhile, the image processor 32 determines that the remaining yarn does not exist when the image processor 32 detects that there is no portion at which a predetermined difference in luminance is shown.
  • FIG. 2 is a block diagram illustrating an exemplary configuration of a drive control system of the pot spinning machine according to the embodiment of the present disclosure.
  • the pot spinning machine 1 includes a controller 50, a drafting-device driving section 51, a wedge driving section 52, a yarn-introduction-pipe driving section 53, a pot driving section 54, a bobbin driving section 55, and a wagon driving section 56.
  • the controller 50 centrally controls the operation of the whole pot spinning machine 1.
  • the controller 50 is electrically connected to the drafting-device driving section 51, the wedge driving section 52, the yarn-introduction-pipe driving section 53, the pot driving section 54, the bobbin driving section 55, and the wagon driving section 56, which are controlled by the controller 50.
  • the controller 50 is also electrically connected to the inspection device 7.
  • Each of the drafting-device driving section 51, the yarn-introduction-pipe driving section 53, the pot driving section 54, the bobbin driving section 55, and the wagon driving section 56 is provided for the plurality of spindles, and the wedge driving section 52 is provided for each of the spindles.
  • the drafting-device driving section 51 rotates the pair of back rollers 15, the pair of middle rollers 16, and the pair of front rollers 17, at respective predetermined rotational speeds.
  • the drafting-device driving section 51 rotates the pair of back rollers 15, the pair of middle rollers 16, and the pair of front rollers 17 by a control command provided to the drafting-device driving section 51 from the controller 50.
  • the wedge driving section 52 drives the wedge 8 of the roving-supply stop device 3.
  • the wedge driving section 52 drives the wedge 8 to move toward or move away from the pair of back rollers 15 by the control command provided to the wedge driving section 52 from the controller 50.
  • the controller 50 commands the wedge driving section 52 to drive the wedge 8 to move toward the pair of back rollers 15, and for stop of the operation of the roving-supply stop device 3, the controller 50 commands the wedge driving section 52 to drive the wedge 8 to move away from the pair of back rollers 15,
  • the yarn-introduction-pipe driving section 53 drives the yarn introduction pipe 4.
  • the yarn-introduction-pipe driving section 53 drives the yarn introduction pipe 4 to move up and down by the control command provided to the yarn-introduction-pipe driving section 53 from the controller 50.
  • the pot driving section 54 rotates the pot 5.
  • the pot driving section 54 drives to rotate the pot 5 with respect to the central axis K of the pot 5 by the control command provided to the pot driving section 54 from the controller 50.
  • the bobbin driving section 55 drives the bobbin 25.
  • the bobbin driving section 55 drives the bobbin 25 attached to the bobbin attachment portion 27 to move up and down together with the bobbin seat 26 by the control command provided to the bobbin driving section 55 from the controller 50.
  • the wagon driving section 56 drives the above-described wagon.
  • the wagon driving section 56 drives the wagon to move together with the inspection device 7 by the control command provided to the wagon driving section 56 from the controller 50.
  • the inspection device 7 notifies the controller 50 of a result of the inspection performed by using the camera 31 and the image processor 32.
  • a unique identification data is assigned to each of the spindles of the pot spinning machine 1.
  • the wagon moves with the inspection device 7 so that the inspection device 7 captures an image of the inside of the pot 5 of each spindle by using the camera 31, and the inspection device 7 processes captured image data by using the image processor 32.
  • the image processor 32 determines for each spindle whether the remaining yarn exists in the corresponding pot 5. When the image processor 32 detects the spindle in which the remaining yarn exists in the corresponding pot 5, the image processor 32 notifies the controller 50 of the identification data of the detected spindle as an inspection result. When the remaining yarn does not exist in the pot 5 of any of the spindles, that is, when yarn rewinding is performed successfully in all of the spindles, the image processor 32 notifies the controller 50 of the successful rewinding as an inspection result.
  • the pot spinning machine 1 performs steps that include, at least, a spinning step in which the yarn 20 supplied from the drafting device 2 is spun in the pot 5 and a rewinding step in which the yarn 20 spun in the pot 5 is rewound onto the bobbin 25.
  • the operation of the pot spinning machine 1 in the spinning step and the rewinding step will be described. Both the spinning step and the rewinding step are performed in a state where the pot 5 is rotated at a predetermined rotational speed.
  • the controller 50 provides a control command to the pot driving section 54 to drive the pot 5 to rotate at the predetermined rotational speed when the operation of the pot spinning machine 1 is started, and in this state, the pot spinning machine 1 performs the spinning step.
  • the controller 50 provides a control command to the drafting-device driving section 51 to rotate the pair of back rollers 15, the pair of middle rollers 16, and the pair of front rollers 17 at respective predetermined rotational speeds.
  • the rotations of the pairs of rollers 15, 16, and 17 deliver the roving 9.
  • the rotational speed of the pair of middle rollers 16 is greater than the rotational speed of the pair of back rollers 15, and the rotational speed of the pair of front rollers 17 is greater than the rotational speed of the pair of middle rollers 16.
  • the roving 9 is drawn out to a predetermined thickness by differences in rotational speed between the pairs of rollers 15, 16, and 17.
  • the yarn 20 that has been drawn out by the drafting device 2 is introduced from the drafting device 2 into the yarn introduction pipe 4 through the yarn suction pipe 22.
  • the yarn 20 that has been introduced into the yarn introduction pipe 4 is discharged from the yarn outlet 4a of the yarn introduction pipe 4 for spinning and spun onto the inside wall 5b of the pot 5 by a centrifugal force generated by the rotation of the pot 5.
  • the yarn 20 is twisted by the rotation of the pot 5.
  • the controller 50 provides a control command to the yarn-introduction-pipe driving section 53 to drive the yarn introduction pipe 4 to displace the yarn introduction pipe 4 relatively downward while driving the yarn introduction pipe 4 to move up and down repeatedly at predetermined intervals.
  • This allows a predetermined amount of the yarn 20 to be deposited on the inside wall 5b of the pot 5. Accordingly, the cake 24 is formed on the inside wall 5b of the pot 5.
  • the controller 50 provides a control command to the drafting-device driving section 51 to perform the yarn cutting. More specifically, the controller 50 provides the control command to the drafting-device driving section 51 to stop both the rotation of the pair of back rollers 15 and the rotation of the pair of middle rollers 16 while keeping the rotation of the pair of front rollers 17. Accordingly, the yarn cutting is performed immediately near the pair of front rollers 17. Then, the spinning step ends.
  • the controller 50 provides a control command to the bobbin driving section 55 to drive the bobbin seat 26 to move upward while commanding the pot driving section 54 to drive the pot 5 to rotate at the predetermined rotational speed as described above.
  • the bobbin 25 moves upward together with the bobbin seat 26.
  • the bobbin 25 enters the pot 5 through the opening 5a of the pot 5. Accordingly, the bobbin 25 is inserted into the pot 5.
  • the controller 50 provides a control command to the yarn-introduction-pipe driving section 53 to drive the yarn introduction pipe 4 to move upward in order to prevent the bobbin 25 inserted into the pot 5 from contacting the yarn introduction pipe 4.
  • the controller 50 commands a feeler driving section, which is not illustrated, to drive a feeler to contact the inside wall 5b of the pot 5, in order to remove the yarn 20 wound on a bottom end of the cake 24 from the inside wall 5b of the pot 5. Consequently, the yarn 20 removed from the inside wall 5b of the pot 5 is wound onto the bobbin 25, and this starts yarn rewinding onto the bobbin 25.
  • a feeler driving section which is not illustrated
  • the controller 50 After all the yarn 20 of the cake 24 is rewound onto the bobbin 25, the controller 50 provides a control command to the bobbin driving section 55 to drive the bobbin seat 26 to move downward. Consequently, the bobbin 25 onto which the yarn 20 is rewound, i.e., the full bobbin 25, is removed from the pot 5. Then, the rewinding step ends.
  • the yarn rewinding may fail for any reason. If the yarn rewinding fails, all or part of the yarn 20 of the cake 24 becomes the remaining yarn that remains in the pot 5. This causes another yarn is deposited on the remaining yarn when another spinning step is performed in the spindle in which the remaining yarn exists in the pot 5. Therefore, in this embodiment, the pot spinning machine 1 is controlled as described below.
  • FIG. 3 is a flowchart for describing a method for controlling the pot spinning machine according to the embodiment of the present disclosure. The shown method for controlling the pot spinning machine is performed under control of the controller 50.
  • the controller 50 sets a value of a variable M to an initial value of 1 (step S1).
  • the variable M is equal to or greater than 4.
  • step S2 the controller 50 starts the first spinning step (step S2).
  • the roving-supply stop device 3 of each of all the spindles is not in operation.
  • the wedge 8 is at a position away from the pair of back rollers 15.
  • step S3 the controller 50 determines whether the first spinning step has ended.
  • step S4 when the controller 50 determines at step S3 that the first spinning step has ended, the controller 50 performs the first rewinding step (step S4).
  • the rewinding step is performed in all the spindles simultaneously.
  • the controller 50 starts the first inspection step (step S5).
  • the controller 50 uses the inspection device 7 to inspect the presence of the remaining yarn. More specifically, the controller 50 provides a control command to the wagon driving section 56 to move the wagon together with the inspection device 7. Consequently, the inspection device 7 inspects each spindle whether the remaining yarn exists in the corresponding pot 5, and notifies the controller 50 of the inspection result.
  • the controller 50 determines whether the remaining yarn exists in the pot 5 of any of the spindles based on the inspection result that is notified by the inspection device 7 (step S6).
  • the controller 50 determines to select Yes at step S6 when the inspection result notified by the inspection device 7 includes one or more spindle identification data, or determines to select No at step S6 when the inspection result does not include any spindle identification data.
  • step S7 the controller 50 determines that the remaining yarn exists in at least one of the spindles at step S6
  • the controller 50 provides a control command to the drafting-device driving section 51 to rotate the pair of back rollers 15 and the pair of middle rollers 16 of each of all the spindles by a predetermined amount in a direction opposite to a roving delivery direction (hereinafter also referred to as "rotate reversely") (step S7).
  • the controller 50 determines that the remaining yarn exists in at least one of the spindles at step S6
  • step S7 the controller 50 provides a control command to the drafting-device driving section 51 to rotate the pair of back rollers 15 and the pair of middle rollers 16 of each of all the spindles by a predetermined amount in a direction opposite to a roving delivery direction (hereinafter also referred to as "rotate reversely") (step S7).
  • the pair of back rollers 15 and the pair of middle rollers 16 are rotated reversely, the rotation of the pair of back rollers
  • the controller 50 stars the roving-supply stop device 3 of the spindle that has been determined at step S5 as the spindle in which the remaining yarn exists, in order to prevent the yarn 20 from being spun in the pot 5 in the next spinning step (step S8). More specifically, the controller 50 starts, of the roving-supply stop devices 3 correspond to the spindles, only the roving-supply stop devices 3 of the spindle that has been identified by the spindle identification data of the inspection result. The controller 50 provides a control command to the wedge driving section 52 that corresponds to the roving-supply stop device 3 of the spindle identified by the identification data.
  • the wedge 8 moves toward the pair of back rollers 15 in the drafting device 2 of the spindle identified by the identification data. This causes a state where the wedge 8 is driven between the top back roller 15a and the bottom back roller 15b of the pair of back rollers 15.
  • step S9 is performed directly after step S6.
  • the controller 50 determines whether it is determined in the inspection step at step S5 consecutively N times that the remaining yarn exists in any/one of the pots 5 (step S9).
  • the number of times it is determined that the remaining yarn exists in the pot 5 in the inspection step at step S5 means the number of times the yarn rewinding fails in the rewinding step at step S4.
  • "N" is an integer that is equal to or greater than two, and is predetermined in consideration with an effect on productivity that may be caused by failure of rewinding. For example, "N" is set to a value within a range from three to five.
  • step S10 the controller 50 stops the operation of the pot spinning machine 1 (step S10).
  • the rotation of the pot 5 is stopped in all the spindles.
  • the pot 5 keeps rotating at the predetermined rotational speed from the start of the first spinning step to the stop of the operation of the pot spinning machine 1. Accordingly, the spinning step, the rewinding step, and the inspection step are performed without stop of the operation of the rotation of the pot 5.
  • step S9 the controller 50 increments the value of the variable M (step S11), and returns to step S2.
  • the controller 50 starts the second spinning step at step S2.
  • the second spinning step is started while the roving-supply stop device 3 of the spindle is in operation.
  • the roving 9 is not supplied to the drafting device 2 of the spindle whose roving-supply stop device 3 is in operation.
  • the yarn 20 is not spun in the pot 5 of the spindle in which the remaining yarn exists when the second spinning step is started. Accordingly, another yarn is not deposited on the remaining yarn in the pot 5.
  • the controller 50 determines whether the second spinning step has ended (step S3).
  • step S5 the controller 50 performs the second inspection step.
  • the second rewinding step is performed for each of all the spindles regardless of the presence of the remaining yarn in the pot 5.
  • the yarn rewinding may succeed in the second rewinding step, even if the yarn rewinding fails in the first rewinding step. For example, even if the yarn rewinding fails in the first rewinding step in a spindle having the identification data "007", the yarn rewinding may succeed in the second rewinding step in the spindle identified by identification data "007".
  • the inspection device 7 notifies the controller 50 of an inspection result not including the variable "007" in the second inspection step that is performed after the second rewinding step. Therefore, the third spinning step is started in the spindle identified by the identification data "007" to spin the yarn 20 in the corresponding pot 5.
  • the yarn rewinding may fail in the second rewinding step after the yarn rewinding failed in the first rewinding step, that is, the yarn rewinding may fail consecutively more than once. For example, if the yarn rewinding fails in the first rewinding step in a spindle having the identification data "003", the yarn rewinding may fail again in the second rewinding step in the spindle identified by identification data "003". In that case, the remaining yarn exists in the pot 5 of the spindle identified by the identification data "003" at the end of the second rewinding step. Accordingly, the inspection device 7 notifies the controller 50 of an inspection result of the second inspection step performed after the second rewinding step including the identification data"003".
  • the controller 50 commands to reversely rotate the pair of back rollers 15 and the pair of middle rollers 16 at step S7 after determining to select Yes at step S6, and starts the roving-supply stop device 3 of the spindle identified by the variable "003" at step S8.
  • the roving-supply stop device 3 stops the supply of the roving 9 to the drafting device 2 of the spindle identified by the identification data "003", so that the yarn 20 is not spun in the corresponding pot 5 in the third spinning step.
  • the three spindles include a first spindle 61, a second spindle 62, and a third spindle 63.
  • the first spindle 61 includes a yarn introduction pipe 4-1 and a pot 5-1
  • the second spindle 62 includes a yarn introduction pipe 4-2 and a pot 5-2
  • the third spindle 63 includes a yarn introduction pipe 4-3 and a pot 5-3.
  • the pot 5-1 of the spindle 61, the pot 5-2 of the spindle 62, and the pot 5-3 of the spindle 63 respectively have therein a cake 24-1, a cake 24-2, and a cake 24-3.
  • the cake 24-1 is made of a yarn 20-1 that is deposited on an inside wall of the pot 5-1.
  • the cake 24-2 is made of a yarn 20-2 that is deposited on an inside wall of the pot 5-2, and the cake 24-3 is made of a yarn 20-3 that is deposited on an inside wall of the pot 5-3.
  • the yarn 20-1 is rewound onto a bobbin 25-1 of the first spindle 61, and the yarn 20-3 is rewound onto a bobbin 25-3 of the third spindle 63.
  • the yarn 20-2 is not rewound onto a bobbin 25-2 in the second spindle 62 due to a rewinding failure, and thus, the cake 24-2 remains on the inside wall of the pot 5-2.
  • the yarn 20-2 of the cake 24-2 in the pot 5-2 corresponds to the remaining yarn.
  • the camera 31 is moved in a direction represented by arrows in FIG. 6 to capture an image of the inside of the pot 5-1 of the first spindle 61, an image of the inside of the pot 5-2 of the second spindle 62, and an image of the inside of the pot 5-3 of the third spindle 63 in sequence, as illustrated in FIG. 6 .
  • the yarn 20-2 remains in the pot 5-2 of the second spindle 62.
  • the roving-supply stop device 3 ( FIG. 1 ) is not started in each of the first spindle 61 and the third spindle 63, but the roving-supply stop device 3 is started in the second spindle 62.
  • the yarn 20-1 is spun in the pot 5-1 of the first spindle 61 through the yarn introduction pipe 4-1, and the yarn 20-3 is spun in the pot 5-3 of the third spindle 63 through the yarn introduction pipe 4-3, as illustrated in FIG. 7 .
  • yarn is not spun in the pot 5-2 of the second spindle 62 since the roving-supply stop device 3 is in operation.
  • the pot 5-1 of the first spindle 61, the pot 5-2 of the second spindle 62, and the pot 5-3 of the third spindle 63 respectively have therein the cake 24-1, the cake 24-2, and the cake 24-3.
  • the cake 24-1 and the cake 24-3 are formed in the second spinning step, and the cake 24-2 is formed in the first spinning step.
  • the yarn 20-1 is rewound onto the bobbin 25-1 of the first spindle 61, and the yarn 20-2 and the yarn 20-3 are rewound onto the bobbin 25-2 of the second spindle 62 and the bobbin 25-3 of the third spindle 63, respectively.
  • the yarn rewinding succeeds in the second spindle 62 in the second rewinding step after the yarn rewinding failed in the second spindle 62 in the first rewinding step.
  • the yarn 20-1, the yarn 20-2, and the yarn 20-3 are respectively spun in the pot 5-1 of the first spindle 61, the pot 5-2 of the second spindle 62, and the pot 5-3 of the third spindle 63 in the third spinning step.
  • the roving 9 is drawn out and cut between the pair of back rollers 15 and the pair of middle rollers 16. Accordingly, a piece 9b of the roving 9 may be delivered into the corresponding pot 5 by the rotation of the pair of middle rollers 16 and the rotation of the pair of front rollers 17.
  • the roving 9 delivered into the pot 5 may be discarded, but the discard of the roving 9 reduces a yarn bundle as row material, which decreases the productivity.
  • the controller 50 controls an amount of rotation of the pair of back rollers 15 and an amount of rotation of the pair of middle rollers 16 via the drafting-device driving section 51, preferably, such that the end 9a of the roving 9 is moved from a position immediately near the pair of front rollers 17 to a position immediately near the pair of middle rollers 16.
  • the roving 9 is not cut even if the pair of middle rollers 16 and the pair of front rollers 17 are rotated with the wedge 8 driven between the top back roller 15a and the bottom back roller 15b by the roving-supply stop device 3, as illustrated in FIG. 13 .
  • the method for controlling a pot spinning machine includes the inspection step performed between the end of the rewinding step performed after the spinning step and the start of the next spinning step to inspect each of the spindles whether the remaining yarn exists in the corresponding pot 5.
  • the roving-supply stop device 3 of the spindle that has been determined in the inspection step as the spindle in which the remaining yarn exists is started to prevent the yarn 20 from being spun in the pot 5 in the next spinning step. Accordingly, even if the yarn rewinding fails in a spindle in the rewinding step and thus the remaining yarn exists in the corresponding pot 5, the yarn 20 is prevented from being spun in the pot 5 in the next spinning step. This prevents another yarn from being deposited on the remaining yarn in the pot 5 even if the yarn rewinding fails.
  • the image of the inside of the pot 5 is captured by the camera 31, and data of the captured image is processed to determine whether the remaining yarn exists in the pot 5.
  • This allows a determination whether the remaining yarn exists in the pot 5 without a contact on the remaining yarn. Accordingly, this allows the inspection step to be performed without loosening of the cake 24 that may be caused by the contact on the remaining yarn. Further, the inspection step enables an accurate determination without the stop of the rotation of the pot 5, by the difference in luminance at the boundary P between the surface of the inside wall 5b of the pot 5 and the remaining yarn, whether the remaining yarn exists in the pot 5.
  • the pairs of back rollers 15 and the pairs of middle rollers 16 of all of the spindles are rotated by a predetermined amount in the direction opposite to the roving delivery direction before the start of the roving-supply stop device 3 of the at least one spindle that is determined as the spindle in which the remaining yarn exists.
  • This allows the roving 9 to be preliminarily drawn back upstream in the roving delivery direction to prevent the cutting of the roving 9 in the drafting device 2, even if the yarn rewinding fails in the spindle in the rewinding step and thus the remaining yarn exists in the corresponding pot 5.
  • the operation of the pot spinning machine 1 is stopped when it is determined in the inspection step consecutively N times that the remaining yarn exists in any/one of the pots 5. This eliminates or minimizes the productivity loss since the operation of the pot spinning machine 1 is stopped at the stage where the yarn rewinding fails in the rewinding step consecutively N times.
  • the camera 31 captures an image of the inside of the pot 5, but not limited to this, the camera 31 may capture an image of the bobbin 25 removed from the pot 5 of each of the spindles after the rewinding step. In that case, an amount of yarn actually rewound onto the bobbin 25, a rewound region of the bobbin 25, and a shape of the deposit of the yarn rewound onto the bobbin 25 are different between the bobbin 25 in which the yarn rewinding succeeded and the bobbin 25 in which the yarn rewinding failed.
  • these differences enable a determination whether the remaining yarn exists in any one of the pots 5, by detection of the differences, such as a difference in an amount of the yarn rewound onto each bobbin 25, through the image processing of image data of the bobbins 25.
  • the bobbin 25 has in a vicinity of an upper end of the bobbin 25 a thin-layer region where the yarn 20 is rewound once or a few times.
  • the differences such as a difference in luminance and a difference in color between the bobbin 25 that has the thin-layer region and the bobbin 25 that does not have the thin-layer region
  • the camera 31 and the image processor 32 are not necessarily required forth inspection step, and for example, a contact sensor may contact the inside wall 5b of the pot 5 to determine whether the remaining yarn exists in the pot 5.
  • the operation of the pot spinning machine 1 is controlled to stop when it is determined in the inspection step consecutively N times that remaining yarn exists in any/one of the pots 5, but the present disclosure is not limited to this embodiment.
  • the operation of the pot spinning machine 1 may be stopped when the number of spindles J, which is the number of spindles determined in a single inspection step performed after M times rewinding step as the spindles in each of which the remaining yarn exists in the corresponding pot 5 (in other words, the number of spindles in each of which the yarn rewinding failed in M times rewinding step), exceeds an predetermined upper limit value.
  • the operation of the pot spinning machine 1 is kept as long as the number of spindles J, determined in a single inspection step as the spindles in each of which the remaining yarn exists in the corresponding pot 5, does not exceed the upper limit value even if the yarn rewinding fails consecutively in a particular small part of the spindles of the pot spinning machine 1.
  • the above-described number of spindles J can be known by counting of the number of identification data that is included in the inspection result.
  • the roving-supply stop device is not limited to a device including a wedge that is movable toward or away from a pair of back rollers and configured to stop supply of a roving to a drafting device by the wedge driven between two rollers of the pair of back rollers.
  • the roving supply stop device 3 may be a known device that is configured to hold and cut a roving upstream of a pair of back rollers.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)

Claims (5)

  1. Verfahren zum Steuern einer Topfspinnmaschine (1), wobei die Topfspinnmaschine (1) eine Vielzahl von Spindeln (61, 62, 63) aufweist, wobei jede Spindel (61, 62, 63) Folgendes aufweist:
    ein Streckwerk (2), das ein Paar hinterer Walzen (15), ein Paar mittlerer Walzen (16) und ein Paar vorderer Walzen (17) aufweist, die in dieser Reihenfolge von einem Vorlauf zu einem Nachlauf einer Vorgarn-Förderrichtung angeordnet sind, wobei das Streckwerk (2) konfiguriert ist, einen Vorgarn (9) herauszuziehen, indem Drehungen des Paars hinterer Walzen (15), des Paars mittlerer Walzen (16) und des Paars vorderer Walzen (17) verwendet werden;
    eine Vorgarnzuführungsstoppeinrichtung (3), die konfiguriert ist, ein Zuführen des Vorgarns (9) zu dem Streckwerk (2) zu stoppen; und
    einen Topf (5, 5-1, 5-2, 5-3), der bei einer vorbestimmten Drehzahl dreht, wobei das Verfahren Folgendes aufweist:
    Spinnen eines Garns (20), der aus dem Streckwerk (2) zugeführt wird, in dem Topf (5, 5-1, 5-2, 5-3) einer jeden der Spindeln (61, 62, 63); und
    Umspulen des Garns (20), der in dem Topf (5, 5-1, 5-2, 5-3) gesponnen wird, auf eine Spule (25); gekennzeichnet durch
    Prüfen jeder Spindel (61, 62, 63), um zu bestimmen, ob zwischen dem Ende des Umspulens, das nach dem Spinnen ausgeführt wird, und dem Start eines nächsten Spinnens ein Restgarn in dem Topf (5, 5-1, 5-2, 5-3) vorhanden ist, und
    Starten der Vorgarnzuführungsstoppeinrichtung (3) von mindestens einer der Spindeln (61, 62, 63), die bei dem Prüfen als die Spindel bestimmt wird, in welcher der Restgarn vorhanden ist, um den Garn (20) daran zu hindern, bei dem nächsten Spinnen in dem Topf (5, 5-1, 5-2, 5-3) gesponnen zu werden.
  2. Verfahren zum Steuern der Topfspinnmaschine (1) nach Anspruch 1, dadurch gekennzeichnet, dass das Prüfen Folgendes aufweist:
    Erfassen eines Bilds einer Innenseite des Topfs (5, 5-1, 5-2, 5-3) von jeder der Spindeln (61, 62, 63) durch eine Kamera (31) und
    Verarbeiten von Daten des erfassten Bilds, um zu bestimmen, ob der Restgarn in dem Topf (5, 5-1, 5-2, 5-3) vorhanden ist.
  3. Verfahren zum Steuern der Topfspinnmaschine (1) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Verfahren ferner ein Drehen des Paars hinterer Walzen (15) und des Paars mittlerer Walzen (16) von allen Spindeln (61, 62, 63) um einen vorbestimmten Betrag in einer Richtung, die entgegengesetzt zu der Vorgarn-Förderrichtung ist, wenn bei dem Prüfen bestimmt wird, dass der Restgarn in dem Topf (5, 5-1, 5-2, 5-3) von mindestens einer der Spindeln (61, 62, 63) vorhanden ist, vor dem Start der Vorgarnzuführungsstoppeinrichtung (3) von der mindestens einen Spindel, die als die Spindel bestimmt wird, in welcher der Restgarn vorhanden ist, aufweist.
  4. Verfahren zum Steuern der Topfspinnmaschine (1) nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das Verfahren ferner ein Stoppen eines Betriebs der Topfspinnmaschine (1), wenn bei dem Prüfen aufeinanderfolgend N Male bestimmt wird, dass der Restgarn in einem beliebigen/einem der Töpfe (5, 5-1, 5-2, 5-3) vorhanden ist, wobei N eine Ganzzahl ist, die gleich oder größer als Zwei ist, aufweist.
  5. Verfahren zum Steuern der Topfspinnmaschine (1) nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das Verfahren ferner ein Stoppen eines Betriebs der Topfspinnmaschine (1), wenn die Anzahl von Spindeln (3), die bei dem einzelnen Prüfen als die Spindeln bestimmt werden, in welchen jeweils der Restgarn in dem entsprechenden Topf (5, 5-1, 5-2, 5-3) vorhanden ist, einen vorbestimmten oberen Grenzwert überschreitet, aufweist.
EP19191654.3A 2018-09-11 2019-08-14 Verfahren zur steuerung einer topfspinnmaschine Active EP3623506B1 (de)

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JPH0699847B2 (ja) * 1985-12-28 1994-12-07 株式会社豊田自動織機製作所 ポツト式紡機における糸端処理方法
JP2515699Y2 (ja) * 1993-05-01 1996-10-30 株式会社日本紡績用品研究所 粗糸供給停止装置
DE4400999A1 (de) * 1994-01-14 1995-07-20 Koenig Reinhard Vorrichtung zum Beheben der Ausbildung einer Fadensehne und/oder eines Fadenbruches eines mittels einer Spinnzentrifuge gesponnenen Fadens und Verfahren hierzu
DE19650461A1 (de) * 1996-12-05 1998-06-10 Schlafhorst & Co W Verfahren zur Herstellung eines Spinnkopses in einer Topfspinnvorrichtung
DE59900172D1 (de) * 1998-01-24 2001-09-06 Schlafhorst & Co W Verfahren und Vorrichtung zum Einleiten des Umwickelvorganges beim Zentrifugenspinnen nach einem Fadenbruch
DE19836071A1 (de) * 1998-08-10 2000-02-17 Schlafhorst & Co W Verfahren zur Erkennung von Fadenresten auf Spinnkopshülsen
DE19938433A1 (de) * 1999-08-13 2001-02-15 Schlafhorst & Co W Verfahren und Vorrichtung zum Zentrifugenspinnen
DE10116706A1 (de) * 2001-04-04 2002-10-10 Schlafhorst & Co W Verfahren und Vorrichtung zum Betreiben einer Zentrifugenspinn-und-zwirnmaschine
DE10211862A1 (de) * 2002-03-18 2003-10-02 Schlafhorst & Co W Zentrifugenspinnvorrichtung
RU2002120366A (ru) * 2002-08-01 2005-02-27 БиоДием Лимитед (AU) Новые производные имидазолия и фармацевтические композиции на их основе
JP2017001779A (ja) * 2015-06-05 2017-01-05 村田機械株式会社 精紡機、糸巻取システム、及び給糸ボビンの製造方法
JP6369406B2 (ja) * 2015-07-08 2018-08-08 株式会社豊田自動織機 紡機の繊維束供給停止装置

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