Classifications

• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04B—KNITTING
  • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
  • D04B15/38—Devices for supplying, feeding, or guiding threads to needles
  • D04B15/48—Thread-feeding devices

Definitions

• the invention relates to a loading weight for a Spulenabwickelêt.
• a certain type of yarn feeding device is designed as a Spulenabwickel réelle. Such Spulenabwickeltechnik are often used for elastic threads, for particularly fine threads or the like.
• the rotation of the bobbins is based on the frictional engagement between the outer circumference of the bobbin and the rollers carrying the bobbin.
• the bobbins are gradually unwound and thus in the course of operation, always lighter. It can be largely empty, i. unwound bobbins come to the fact that the coils on the rollers hopping.
• the slip between the bobbin and the rollers depends on the one hand on the weight of the coil and on the other hand on its moment of inertia. Both vary. The variation is different. Therefore, full, heavy coils behave differently than nearly empty, light coils.
• the loading weight according to the invention contains a loading means which generates a defined weight force. This weight causes regardless of whether the bobbin is full or partial or almost completely emptied, a sufficient pressure of the bobbin on the drive rollers. In this way it can not happen that the thread bobbin, for example, slips or hops due to stringing and unwinds more thread than actually provided.
• the load weight opens the possibility to process elastic threads under tension, if necessary also increased tension. Due to the movable mounting of the loading means, however, this does not or only very slightly contributes to the mass moment of inertia of the thread bobbin. The movable bearing prevents the rotation of the Thread bobbin transfers unchanged to the load medium.
• the load weight on the one hand increases the effective weight of the bobbin - but it does not increase the moment of inertia of the bobbin. This can prevent the spinning of the coil during start-stop operation. In addition, the consumption of the coil is allowed to complete emptying of the same.
• the thread bobbins if they are almost empty (for example, still 1% to 3% of the thread amount is available as a remainder), to replace, can be abandoned.
• the load weight allows the thread bobbins to be easily used up.
• the loading means may be formed by one or more rigid weights which define a center of gravity on the axis of rotation of the thread bobbin.
• the weight or the weights are preferably mounted rotatably about this axis of rotation.
• the axis of rotation of this bearing is preferably identical to the axis of rotation of the bobbin.
• a bobbin can thus be set in rotation and braked without having to accelerate or decelerate the load weight. While the vertically downwardly acting weight of the bobbin is increased by the load weight, no increase in the moment of inertia of the bobbin is given. This facilitates the intermittent operation of a corresponding yarn feeding device in the form of a Spulenabwickel réelles both full, as well as partially or almost completely empty bobbins.
• the loading means need not necessarily be designed as a rigid body. It can also be designed in the form of a low-viscosity liquid, which can be arranged in the housing of the load weight and flow there almost unhindered.
• the housing is formed inside smooth-walled.
• the liquid can be to act water or an aqueous solution, for example a mixture of water and an alcohol, for example glycol.
• the housing is free of bubbles, that is completely filled with liquid.
• the housing sits in the bobbin and can rotate without necessarily causing the liquid body to rotate. If the coil rotates for a long time and the liquid body begins to rotate due to deadweight effects, the coil can be slowed down suddenly without the momentum of the fluid body driving the coil on. Rather, the liquid body can rotate freely in the housing for a long time until it gradually comes to a standstill.
• the torques exerted on the yarn package are negligible as with the solution with a rotatably mounted, rigid load weight.
• the housing is preferably provided with one or more means for centric clamping in the bobbin of the unwinding spool.
• Such means may be resilient edges, resilient tongues, rubber elements extending around the outer periphery of the housing, or the like.
• Fig. 2 shows one of the yarn packages of FIG. 1 in vertical section with an inventive, also vertically cut load weight and
• Fig. 3 shows a modified embodiment of a load weight in a bobbin, in a vertical sectional view.
• Fig. 1 illustrates a bobbin unwinding apparatus 1 as is commonly used on circular and / or flat knitting machines to provide one or more yarns 2, 3 to knitting stations or other yarn consumption points.
• the threads 2, 3 are unwound from thread bobbins 4, 5, which lie on respective rotatably driven, in pairs horizontally extending rollers 6.
• the horizontal axes of rotation of the rollers 6 are oriented parallel to the axes of rotation of the bobbins 4, 5.
• the rotation of the rollers 6 is effected by an electric motor or, as shown in Fig. 1, by rotation of a pulley 7 which is driven by a circulating toothed belt.
• the rollers 6 and the pulley 7 are rotatably supported by bearings, which are housed in a housing 8. This is at the same time central carrier and gear housing of a transmission, which connects the pulley 7 drivingly with the rollers 6.
• the two thread bobbins 4, 5 each have a central opening, e.g. is defined as the interior of a bobbin 9, as is apparent from Fig. 2.
• This bobbin 9 is e.g. formed as a hollow cylindrical plastic ring and carries on its outer peripheral surface a thread winding 10, which consists of the unwound thread 2 or 3.
• a loading weight 11 In the opening of the winding body 9 sits a loading weight 11 with a housing 12, which preferably consists of two housing shells 13, 14.
• the housing shells 13, 14 enclose an interior 15, which is preferably sealed to the outside.
• the housing shells 13, 14 may have one or more leading into the interior 15 openings.
• the housing shells 13, 14 are formed closed, so that the interior 15 is largely sealed against the environment.
• the housing 12 is seated with its preferably approximately cylindrical outer peripheral surface backlash or backlash in the winding body 9.
• the housing 12 may be provided with spring means or other clamping means to cause a secure fit of the load weight 11 in the winding body 9, to prevent falling out and at the same time to allow easy insertion or removal of the load weight 11 from the winding body 9.
• Such a spring or clamping means may be formed by annular edges 16, 17 of the housing 12 which extend in the axial direction.
• the edges 16, 17 may be slightly resilient in the radial direction.
• These annular edges 16, 17 can also be provided with axial slots, so that they form individual radially resilient fingers. They are preferably somewhat bevelled outwards in order to facilitate the insertion of the load weight 12 into the winding body 9 with the thus formed insertion cone.
• the two housing shells 13, 14 are preferably permanently connected to each other.
• a centric screw 18, a bonding or the like formed on the peripheral edge seam 19 in the circumferential direction can serve singly or in combination.
• the axis of symmetry or longitudinal / central axis of the winding body 9 is at the same time the axis of symmetry 20 of the housing 12.
• a bearing 21 is arranged in the housing 12.
• it is a rolling bearing, preferably in the form of a deep groove ball bearing.
• Its inner ring is seated on a corresponding bearing seat formed in the housing 12.
• Its outer ring carries a loading means 22, here in the form of a weight body 23.
• This is, for example, designed as a hollow cylindrical heavy ring.
• the ring can be made of a high density material like lead or too Steel and one with a heavy material, such as, for example, filled plastic.
• the center of gravity of the weight body 23 lies on the axis of symmetry 20, which is at the same time the axis of rotation of the bearing 21.
• the loading weight 11 and the arrangement consisting of the Spulenabwickel réelle 1, the bobbin 4 and the load weight 11, operates as follows:
• the rollers 6 which receive the thread bobbin 4 are rotated. If this happens, the bobbin 4 is rotated by the static friction between the outer peripheral surfaces of the bobbin 4 and the rollers 6 in rotation. This thus rotates about the axis of rotation 20. Thanks to the bearing 21, however, no torque is transmitted to the weight body 23. This remains so and does not turn. If the bearing 21 transmits a low torque, the weight body 23 is possibly accelerated very slowly, so that it does not have a braking effect on the rotation of the thread bobbin 4. However, the weight of the weight body 23 acts vertically downward on the bobbin 9 and thus presses the bobbin 4 to the rollers 6 at. As a result, sufficient static friction between the yarn package 4 and the rollers 6 is always provided.
• Stops the rotation of the rollers 6 can also stop the bobbin 4 instantaneously. A sufficient brake torque transmission is achieved thanks to the pressing effect of the load weight 11. If the weight body has been gradually set in rotation after a long operation of the yarn feeding device 1, it can now continue to rotate freely without driving the yarn package 4.
• the bearing 21 decouples the rotation of the weight body 23 from the rotation the winding body 9 and the housing 12th
• the hermetic seal of the preferably closed housing 12 prevents the penetration of dust or other foreign material to the bearing 21, which could lead to a stiffness. Rather, the bearing 21 remains smooth and thus secures the function of the load weight 11 in the long term.
• FIG. 3 illustrates a modified embodiment of the load weight 11.
• the housing 12 may be formed in one piece. It surrounds the interior 15, which is filled with a liquid 24, with preferably smooth walls. This serves as a loading means 22.
• the liquid 24 fills the interior 15 preferably free of bubbles. It forms a body of liquid that can rotate in the housing 12 about the axis 20 without transmitting a significant torque to the housing 12.
• the approximately cylindrical outer circumference of the housing 12 may be formed somewhat flexible to allow a resilient pressure to the inner surface of the winding body 9. Alternatively, other elastic or resilient means may be provided to hold the housing 12 frictionally in the winding body 9.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Tension Adjustment In Filamentary Materials (AREA)
• Storage Of Web-Like Or Filamentary Materials (AREA)

Priority Applications (4)

Applications Claiming Priority (1)

Publications (1)

Family

ID=39576006

Family Applications (1)

Country Status (4)

Citations (4)

• 2008
  • 2008-04-15 CN CN2008801287497A patent/CN102007240A/zh active Pending
  • 2008-04-15 WO PCT/EP2008/054560 patent/WO2009127244A1/de active Application Filing
  • 2008-04-15 BR BRPI0822567-2A patent/BRPI0822567A2/pt not_active IP Right Cessation
  • 2008-12-31 TW TW097151514A patent/TW201002890A/zh unknown

Patent Citations (4)

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