Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H67/00—Replacing or removing cores, receptacles, or completed packages at paying-out, winding, or depositing stations
  • B65H67/08—Automatic end-finding and material-interconnecting arrangements
  • B65H67/081—Automatic end-finding and material-interconnecting arrangements acting after interruption of the winding process, e.g. yarn breakage, yarn cut or package replacement
  • B65H67/085—Automatic end-finding and material-interconnecting arrangements acting after interruption of the winding process, e.g. yarn breakage, yarn cut or package replacement end-finding at the take-up package, e.g. by suction and reverse package rotation
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2701/00—Handled material; Storage means
  • B65H2701/30—Handled filamentary material
  • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

• the invention relates to a method and device for detecting the yarn end on a bobbin in a textile machine producing or processing yarn, particularly after interruption of winding caused by a yarn breakage, when after the yarn breakage the bobbin is approached by a suction nozzle, into which the yarn end is sucked from the rotating bobbin.
• yarn is wound on a bobbin for further processing. Due to different circumstances, irregularities, etc. yarn breaks occur during winding yarn on the bobbin. After the yarn is broken, the yarn end is wound on the bob- bin and for further operations on the machine, such as resumption of the winding of the yarn, it is necessary to detect the yarn end on the bobbin, grasp it and introduce it into the appropriate working means of the textile machine, which performs further operations to resume yarn winding. In principle, this can be done either manually or automatically, or also in certain semi-automatic modes.
• the method that has been proven successful over the years is a method of detecting by means of a suction nozzle, whose suction mouth approaches the bobbin with the desired yarn end, whereby strong vacuum is supplied to the suction nozzle.
• the yarn end is sucked in from the surface of the bobbin, by which means the yarn end is detected, whereupon, while the bobbin continues to rotate, the detected yarn end is by a suitable motion of the suction nozzle moved to a desired position on the machine for carrying out further operations to resume winding.
• DE102016203066 discloses a device for detecting the yarn end on a package on a bobbin in a weft winding machine, in which the package gets into contact with an excita- tion surface of a textile made of synthetic fibers, which serves to excite the free yarn end on the package, whereupon this free yarn end on the package is sucked by another rotation of the bobbin into the suction aperture assigned to the circumference of the package on the bobbin, by which means this yarn end is detected for further operations.
• the disadvantage of this arrangement is relatively low reliability of the detecting process for firmer packages, such as those produced on ring spinning machines, as well as a risk of damaging the package by the contact with the excitation surface.
• Another shortcoming is the relatively high amount of the suction air required for sucking in the excited yarn end from the surface of the bobbin to the suction nozzle. Summary of the invention
• the aim of the present invention is to eliminate or at least reduce the drawbacks of the background art, especially to increase the effectiveness of automated detection of the yarn end on a bobbin.
• the aim of the invention is achieved by a method for detecting a yarn end on a rotating bobbin in a textile machine producing or processing yarn, after the interruption of winding due to a yarn breakage, wherein after the yarn breakage the rotating bobbin is approached by a suction nozzle, into which the yarn end is sucked from the rotating bobbin, which is characterized in that
• the yarn end is carried to the suction nozzle, into which it is subsequently sucked by the stream of the sucked-in air in the direction away from the movable means to a defined position in the suction nozzle for further operation.
• the aim of the invention is as well achieved by a device for detecting the yarn end on a rotating bobbin in a textile machine producing or processing yarn after the interruption of winding of the yarn onto the bobbin due to a yarn breakage, which comprises in a suction nozzle alignable with a package on the rotating bobbin and connected to a vacuum source, which device is characterized in
• the advantage of the invention is a substantial increase in reliability of detecting the yarn end on the bobbin, while using a considerably lower vacuum than is usual in solutions according to the background art, which applies also to the bobbins where the yarn end is not only wound on the bobbin, but it is even "trapped" in the package, and so it resists being sucked in by strong vacuum using the existing technology.
• the movable means is perforated and air is sucked by a suction nozzle through the movable means to capture the yarn end and withdraw it from the bobbin.
• the suction nozzle is arranged so that air is sucked in a space between the movable means and the bar.
• the suction nozzle can be arranged in the space between the rear edge of the bar and the carrier surface of the movable means or it can be located between the bar and the carrier surface of the movable means.
• the bar is situated obliquely to the direction of the movement of the carrier surface.
• the bar is provided with a securing counter edge which advantageously restricts a reverse movement of the yarn from a space between the bar and the carrier surface.
• the securing counter edge could be composed of a bent front portion of the bar in the direction of the movement of the carrier surface, whereby the bar could be situated opposite the direction of the movement of the carrier surface.
• it could be created by another suitable method and/or is situated on another portion of the bar, e.g. in its middle portion, etc.
• the bar or the front edge of the bar has the width of the carrier surface of the movable means.
• the movable means could move in a direction opposite to the rotating bobbin and could be an endless movable belt or of a rotatable cylinder surface. It could made from a textile material or leather or a synthetic material. These measures enhance the effectiveness of the inventive method.
• the suction nozzle is preferably associated with an unillustrated sensor of the presence of yarn indicating that the yarn end has been sucked into the suction nozzle, which is at the same time a signal of successful detection of the yarn end on the bobbin, as well as a signal for subsequent operations aimed at the renewal of the winding of the yarn on the bobbin, i.e., e.g., to resume yarn production or yarn processing.
• an unillustrated sensor of the presence of yarn indicating that the yarn end has been sucked into the suction nozzle which is at the same time a signal of successful detection of the yarn end on the bobbin, as well as a signal for subsequent operations aimed at the renewal of the winding of the yarn on the bobbin, i.e., e.g., to resume yarn production or yarn processing.
• FIG. 1 shows the general principle of the invention with a first embodiment of a movable means in the form of an endless movable belt without a front suction nozzle on the rear side of the movable means;
• Fig. 2 shows the general principle of the invention with a second embodiment of the movable means in the form of an endless movable belt with the front suction nozzle on the rear side of the movable means; and Fig. 3 represents the general principle of the invention with a third embodiment of the movable means in the form of a rotatable cylindrical surface.
• a method for detecting the yarn end on a bobbin in a textile machine and a device for performing the method will be described with reference to an example of embodiment in a spinning machine producing yarn 1 , which is wound on a rotating bobbin 2, which is rotatably mounted in the machine structure of the textile machine.
• the yarn 1 being wound forms on the bobbin 2 a package 3 with a surface 4.
• the method and device can be also used in a textile machine processing yarn 1 .
• the movable means 6 is made as an endless movable belt wrapped around at least two guide pulleys 16, at least one of which is connected to a rotation drive.
• the system of the pulleys 16 provided with a tensioning device to ensure that the required tension is maintained in the movable means 6.
• the movable means 6 is provided as a cylinder surface which is rotatably mounted in the frame of the device for detecting the yarn 1 end and is coupled to a drive of its rotation.
• the carrier surface 5 has a surface structure that improves the adhesiveness of the detected yarn 1 to the carrier surface 5, e.g., if the movable means 6 is formed by an endless movable leather belt, it is advantageous for the carrier surface 5 to be subjected to a finishing process, such as grinding or another suitable technology for structuring the leather surface (surface wrinkling, hairing).
• the carrier surface 5 either has also been wrinkled by an appropriate technology, or it is smooth and adhesiveness between the carrier surface 5 and the yarn 1 end being detected is determined by the material composition of the movable means 6, by the surface treatment of the carrier surface 5, the material composition of the yarn 1 , the yarn 1 hairiness, etc.
• the adhesiveness of the yarn 1 being detected to the carrier surface 5 must not be too great so that the yarn 1 can be successfully detected and, at the same time, relatively readily delivered to other means of the device according to the present invention in the further steps of the method according to the invention.
• the width of the yarn 1 end detecting zone on the bobbin 2 is determined by the width of the carrier surface 5 of the movable means 6, i.e. the dimension in the plane of the carrier surface 5 in the direction perpendicular to the direction S1 of the movement of the movable means 6.
• the length of the yarn 1 end detecting zone on the bobbin 2, i.e. the dimension of the detecting zone in the direction of the rotation of the bobbin 2 is determined by the mutual arrangement of the surface 4 of the package 3 on the bobbin 2 and the position of the space 10 between the front edge 9 of the bar 8 (which will be described below) and the carrier surface 5.
• the above-mentioned suction nozzle 1 1 is by its mouth 12 associated with the space 13 between the rear edge 14 of the bar 8 and the carrier surface 5 of the movable means 6 or it is located between the bar 8 and the carrier surface 5 of the movable means 6.
• the bar 8 is situated obliquely to the direction S1 of the movement of the carrier surface 5. This measure enhances the suction effect of the second stream of the air being sucked in by the suction nozzle 1 1 on the yarn 1 being detected in the space 13 between the bar 8 and the carrier surface 5.
• the suction nozzle 1 1 is associated with an unillustrated sensor of the presence of yarn 1 indicating that the yarn 1 end has been sucked into the suction nozzle 1 1 , which is at the same time a signal of successful detection of the yarn 1 end on the bobbin 2, as well as a signal for subsequent operations aimed at the renewal of the winding of the yarn 1 on the bobbin 2, i.e., e.g., to resume yarn 1 production or yarn 1 processing.
• the bar 8 is provided on its side adjacent to the carrier surface 5 with a securing counter edge 15, which has the same width of the carrier surface 5 of the movable means 6 and is directed against the direction S1 of the movement of the carrier surface 5 during detecting the yarn 1 end on the bobbin 2.
• the securing edge 15 restricts the possible reverse movement of the yarn 1 from the space between the bar 8 and the carrier surface 5, thus increasing the success of transferring the detected yarn 1 end from the bobbin 2 to the suction nozzle 1 1 , as will be described in more de- tail hereinafter.
• the securing edge 15 is formed by bending the front portion of the bar 8 in the direction S1 of the movement of the carrier surface 5, and so according to the angle of the bending it may even extend the space 10 to a greater length of the carrier surface 5, than would be the space 10 defined only by the front edge 9 of the bar 8 and the carrier surface 5.
• the securing edge 15 is created by another suitable method and/or is situated on another portion of the bar 8, e.g. in its middle portion, etc.
• the whole above-described device for detecting the yarn 1 end on the bobbin 2 is mounted on an unillustrated manipulation means, by which the device for detecting the yarn 1 end on the bobbin 2 approaches the surface 4 of the package 3 on the respective bobbin 2 to assume the required position and reach the required distance of the carrier surface 5 and the space 10 from the surface 4 of the package 3 on the respective bobbin 2.
• the manipulation means is part of an attending device, which is arranged movably along a row of workstations of the spinning machine, wherein each workstation comprises apart from other means also a winding device of yarn 1 on a bobbin 2.
• the suction nozzle 1 1 is independently positionable between the position in which it is with its mouth 12 aligned with the carrier surface 5 of the movable means 6 and the position in which it is possible to deliver the yarn end 1 captured in the suction nozzle 1 1 to other working means of the textile machine to resume the winding of the yarn 1 on a bobbin 2, e.g. to resume the yarn 1 production.
• the invention is based on the fact that the carrier surface 5 of the movable means 6 and the bar 8 approach the surface 4 of the package 3 on the bobbin 2 creating a space 10 in which the yarn end is detected and captured.
• the carrier surface 5 is movable in the direction S1 in a different direction than the direction S2 and preferably in an opposite direction to the direction of S2 of the movement of the surface 4 of the package 3 on the bobbin 2 when detecting the yarn 1 end.
• the bobbin 2 therefore rotates in the direction S2.
• the carrier surface 5 is advantageously in close proximity to the surface 4 of the package 3 on the bobbin 2, preferably not touching it so that the package 3 is not damaged.
• the carrier surface 5 is as close to the surface 4 of the package 3 as possible, since it is true that the closer it is to the surface 4 of the package 3 the smaller the space 10 is and it is more likely that the yarn end 1 on the bobbin 2 is successfully detected and captured, especially in ring spinning machines.
• the yarn end 1 is captured in the space 10 and by the movement of the movable means 6 it is withdrawn from the bobbin 2, whereby it still passes through the space 10, until the yarn end is delivered to the mouth 12 of the sue- tion nozzle 1 1 , into which it is sucked.
• the risk of the detected yarn 1 end being pulled down back onto the bobbin, e.g., due to a part of the yarn 1 length being trapped in the package 3 on the bobbin 2, is further prevented by the action of a stream of the air being sucked in by the suction nozzle 1 1 , or also by a certain adhesiveness of the yarn 1 to the carrier surface 5 and, last but not least, also by the securing counter edge 15 on the bar 8, particularly when the detected yarn 1 end is pulled down back onto the bobbin 2 as a result of the re- sistance against releasing the end portion of the yarn 1 from the bobbin 2 due to the yarn being trapped in the package 3, when a temporary increase in the tension in the captured end portion of the yarn 1 arises and, consequently, reaction force is created, acting against the direction of the movement of the carrier surface 5 and this reaction force is in some cases capable of withdrawing the captured end portion of the yarn 1 from the space 10 as far as to the bobbin 2.
• the suction of the yarn 1 into the suction nozzle 1 1 is subsequently indicated by the above-mentioned sensor of the presence of yarn 1 in the suction nozzle 1 . From the suction nozzle 1 1 the detected yarn 1 end is subsequently delivered to the following means to renew the winding process or to resume the yarn 1 production.
• the carrier surface 5 is permeable to air and its rear side is in the region Z of the carrier surface 5 approaching the surface 4 of the package 3 on the bobbin 2 is aligned with a front suction nozzle 7 connected to the vacuum source, thereby creating the first stream of the air being sucked in.
• the front suction nozzle 7 is with its suction inlet assigned to the rear side of the movable means 6.
• the side of the movable means 6 op- posite to the side that during detecting the yarn 1 end approaches the surface 4 of the package 3 on the bobbin 2, e.g.
• the movable means 6 is made permeable to air by perforation, that is to say, by an appropriate system of through holes of a suitable shape, size and three- dimensional layout.
• the movable means 6 may also be made from other materials, which are not permeable to air, such as leather, impermeable plastics and other synthetic materials, metals, etc.
• the permeability of the movable means 6 to the air may be solved by different methods and by using different materials of the movable means 6.
• the method for detecting the yarn 1 end on the bobbin 2 modified by adding a front suction nozzle 7 consists in that in the described approaching position of the carrier surface 5 and the pressing line 10 to the bobbin 2, the yarn end 1 on the bobbin 2 is in addition acted upon by the first air stream being sucked in by the front suction nozzle 7 through the carrier surface 5.
• the end of the yarn 1 is removed from the surface 4 of the package 3 on the bobbin 2 and is captured in the space 10, whereupon by a movement of the movable means 6 it is carried further through the space 10 as far as to the mouth 12 of the rear suction nozzle 1 1 , which is in this example of embodiment the rear suction nozzle 1 1 , into whose mouth 12 the yarn end is sucked in by the second stream of the air being sucked in.
• the advantage of the present invention is a substantial increase in reliability of detecting the yarn end on the bobbin, while using a considerably lower vacuum than is usual in solutions according to the background art, which applies also to the bobbins where the yarn end is not only wound on the bobbin, but it is even "trapped" in the package, and so it resists being sucked in by strong vacuum using the existing technology.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Replacing, Conveying, And Pick-Finding For Filamentary Materials (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=67187916

Family Applications (1)

Country Status (4)

Cited By (3)

Families Citing this family (2)

Citations (6)

Family Cites Families (5)

• 2016
  • 2016-11-30 CZ CZ2016-746A patent/CZ2016746A3/cs unknown
• 2017
  • 2017-11-20 WO PCT/IB2017/057254 patent/WO2018100464A1/en not_active Ceased
  • 2017-11-20 EP EP17811724.8A patent/EP3548410B1/en active Active
  • 2017-11-20 CN CN201780073883.0A patent/CN110023219B/zh active Active

Patent Citations (6)

Also Published As

Similar Documents

Legal Events