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
  • B65H51/00—Forwarding filamentary material
  • B65H51/20—Devices for temporarily storing filamentary material during forwarding, e.g. for buffer storage
  • B65H51/22—Reels or cages, e.g. cylindrical, with storing and forwarding surfaces provided by rollers or bars
• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
  • D03D47/34—Handling the weft between bulk storage and weft-inserting means
  • D03D47/36—Measuring and cutting the weft
  • D03D47/361—Drum-type weft feeding devices
  • D03D47/364—Yarn braking means acting on the drum
  • D03D47/366—Conical

Definitions

• the invention relates to a thread efergerat of the type specified in the preamble of claim 1 and a thread brake body according to the preamble of claim 17
• the holding membrane is a rubber or plastic ring membrane with a constant circumferential wall thickness between the holding area of the brake band and the support ring there are several bending zones with an arcuate cross-section.
• the retaining membrane grips with a circular apron over the back of the brake band, which is glued to the apron Preload force applied
• the thread must pass through the pull-off edge under the brake band, which defines a braking surface that is continuous in circumferential direction and has a substantially linear contact area with the pull-off edge.
• the brake band In the passage area of the thread, the brake band is placed under B Formation of a crescent-like space lifted off the trigger edge Since the thread revolves around the trigger edge when the trigger is pulled, the crescent-shaped intermediate space also moves with the thread. In addition, the thread acts on the brake band as a result of the movement of the trigger, which causes the brake band to act locally on the The passage area of the thread is slightly deformed, which can cause waves in the inherently tensile but flexible brake band adjacent to the deformation area.
• the holding membrane follows the working movements of the brake band, since the holding membrane has to transmit the axial pretensioning force to the brake band and center the brake band on the trigger edge
• the local deformations of the brake band in each case in the vicinity of the passage area of the thread can result in a varying contact pressure at the pull-off edge of the storage body, which leads to an uneven thread tension course in the pulled thread.
• the invention is based on the object of improving a thread delivery device of the type mentioned at the beginning and a thread brake body in such a way that a tension profile which is as uniform as possible can be achieved in the drawn thread or to minimize undefined deformation processes in the brake band and in the surrounding local area of the brake band in operation which runs the thread between the brake band and the trigger edge of the storage body
• the support of the brake band in the holding membrane is improved unexpectedly with the flat areas with reduced wall thickness.
• the wall thickness of the holding membrane or its degree of hardness can be higher than in the known holding membrane, so that the rigidity of the holder of the brake band is higher, which means the centering of the brake band on the Pull-off edge also benefits
• a controlled deformation of the holding membrane between the holding area and the support ring is achieved through the flat areas during thread pull-off, in which undefined deformations of the brake band, which could lead to irregularities in the thread tension, are compensated for or swallowed.
• the brake band behaves desirably because the holding membrane shows a sluggish response due to the flat areas with reduced wall thickness important self-compensation effect is achieved even up to the highest thread take-off speeds and with difficult thread qualities.
• Another important advantage is that thanks to the reduced wall thickness in the flat areas there are no breakthroughs in which fluff can get stuck or the thread has been caught, especially when threading into the thread brake the manufacture of the holding membrane and the necessary injection molding tool is easier if, for the purpose of predetermined deformation behavior between the holding area and the support ring, the flat areas influencing the deformation behavior are not open, but are designed with a reduced wall thickness
• the flat areas are expediently regularly distributed in the circumferential direction, so that they define spring spokes between them which carry out the main power transmission from the support ring into the brake band and are expediently formed in the wall thickness of the holding membrane, whereas the wall thickness in the flat areas is considerably less
• the holding membrane In order to give the holding membrane a soft, relatively damped spring behavior, the holding membrane should have at least one bend between the holding area and the support ring, in which the spring spokes act like spiral springs and transmit the forces to the brake band
• the flat areas with reduced wall thickness form gaps between the spring spokes, these gaps being filled with membrane layers similar to floating skin, at least adjacent to the holding area.
• the flat areas can have any shape and, overall, can occupy an optional total proportion of the usable area
• the circumferential widths of the flat areas are expediently different from the circumferential widths of the spring spokes, preferably smaller. However, it would also be possible to make the flat areas and the spring spokes approximately the same width in the circumferential direction
• the wall thickness in the flat areas should be in a ratio of approx. 5 1 to the wall thickness in the spring spokes. This ratio can be deviated from
• Both the flat areas and the spring spokes are expediently oriented approximately radially, so that the thread brake body can be used for any pull-off direction regardless of the thread pull-off direction from the storage body.
• the brake band is effectively centered on the storage body
• the flat areas are expediently of approximately oval shape, which is also advantageous in terms of production technology
• the flat areas and the spring spokes should form an essentially smooth surface.
• This surface which faces the inlet direction of the thread, ensures that no fluff can get stuck and the thread cannot get stuck, even if it does not Threading touches the surface.
• the flat areas with the reduced wall thickness in the surface can be under a prestress, that is to say that the thin-walled membrane layer bridging the gaps is then stretched in one or more directions, so to speak
• the bend is expediently extended inwards by a conical smooth-flat apron which supports the brake band on its rear side and dampens an excessively nervous or lively suspension behavior of the brake band
• a cantilevered lip can be formed in the holding area, which delimits an open pocket for the brake band with the apron.
• the brake band could be glued to the apron In most cases, however, it is sufficient to insert the brake band only into the pocket and secure it in place solely by the form fit In any case, operation is due to the system voltage of the brake body and the contact between the brake band and the apron determines the position of the brake band
• the cantilever length of the lip could amount to about 10 to 25% of the brake band width. This facilitates the assembly or insertion and removal of the brake band and still ensures proper positioning of the brake band, even when the brake body is being transported
• the flat areas with reduced wall thickness should start a short distance outside the insert pocket in which the brake band is positioned with its outer edge
• the wall thickness of the aprons can be smaller than the wall thickness of the spring spokes, but larger than the wall thickness in the flat areas with reduced wall thickness
• the holding diaphragm is expediently a one-piece molded molded part made of a plastic, such as polyurethane, for example.
• a plastic such as polyurethane
• the formation of the spring spokes required for the function of the holding diaphragm, which should come into play as a result of the interspaces, can be easily mastered in terms of shape if the interstices between the spring spokes are suitable for swimming pools a thin layer of the holding membrane is bridged. This considerably simplifies the manufacturing process of the holding membrane by injection molding and provides the advantage that, thanks to the floating membranes, the gaps can participate in the energy distribution or energy consumption and support of the brake band An embodiment of the subject matter of the invention is explained with the aid of the drawings
• FIG. 1 is a schematic side view of a thread delivery device with a thread brake
• FIG. 2 shows an axial section through a thread brake body, as can be used in the thread brake of FIG. 1,
• FIG. 3 shows a rear view of the thread brake body of FIG. 2,
• Fig. 4 is an enlarged section of the section of Fig. 2, and
• FIG. 5 shows a further enlarged detail from FIG. 2
• a thread delivery device F in FIG. 1 has the task of withdrawing a thread Y from a thread supply (not shown) (on the left in FIG. 1), temporarily storing it in turns on a stationary storage body 4 and by means of a thread brake B structurally integrated in the thread delivery device F with an approximately constant thread tension curve from a textile machine, for example a weaving machine, in a housing 1, a rotary drive 2 is provided for a winding element 2a, which, for example by means of signals from a sensor device 3, temporarily stores the thread in a sufficient supply size on the storage body 4 supporting arm 8 is provided in a carriage 7 adjustable for adjusting the braking action, a carrier 6 is provided which holds an annular thread brake body A in such a way that it is printed with a truncated cone-shaped brake band S shown in FIG.
• the thread brake body A shown in FIGS. 2 to 5 with various details has a circular retaining membrane M made of rubber or plastic material, for example polyurethane in a transparent setting.
• the retaining membrane M is expediently an integral injection molded molding, with a truncated cone-shaped, endless brake band S, preferably made of a metal alloy, is positioned in the inner region of the holding membrane M
• the holding membrane M could also consist of a composite material, for example using Kevlar.
• a conical apron 10 Adjacent to a circular holding area 11, a conical apron 10 extends inwards in the holding membrane M, which is on the back of the Brake band S rests and extends approximately to its inner edge area Outside the holding area 11, the holding membrane M is shaped with a generally C-shaped bend L, which has an approximately 90 ° transition into an outer, rigid to the brake band S support ring R ignore t If necessary, the support ring R is an independent component to which the holding membrane M is connected
• the holding membrane M In the bend L there is an outer ring area 9 of the holding membrane M, which contains flat areas D (FIG. 4) with reduced wall thickness S1 distributed in the circumferential direction. These flat areas D form, for example, oval gaps (FIG. 3) between approximately radiating and into the ring area 9 the retaining membrane M integrated spring spokes E with the wall thickness S2
• the wall thickness S2 can be in a ratio of approx. 5 1 to the wall thickness S1 in the flat areas D or spaces, so that with a wall thickness S2 of approx. 1.0 mm the wall thickness S1 approx. 0.
• the flat areas D can be oval and in be oriented approximately radially to the axis of the thread brake body A, as well as the spring spokes G
• the flat areas D are the same width as the spring spokes E, but the widths of the flat areas D could also be different (eg smaller) from the width of the spring spokes E Chen areas D begin at a distance from the holding area 11 for the brake band S
• a circumferential lip 13 (FIG. 5) which projects freely inward is formed, which with the apron 10 forms a circumferential pocket T open for the outer edge of the brake band S
• the cantilevered length of the lip 13 corresponds, for example, to one fifth of the width W of the brake band S.
• the insertion pocket T lies approximately in the same radial plane as the transition from the ring region 9 into the support ring R.
• the lip 13 could be omitted and the brake band S attached to the apron 10 by gluing
• the radial extent of the ring area 9 of the holding membrane M corresponds approximately to the radially viewed extent of the brake band S.
• the wall thickness of the aprons 10 can be less than the wall thickness S2 of the spring spokes, but larger than the wall thickness S1 of the membrane layers G, which in the flat areas D Bridging gaps between the spring spokes E In the embodiment shown, the flat areas are bridged continuously with the membrane layer G. It would be conceivable to bridge only the inner end areas of the flat areas D with the membrane layers G and to leave open passages open on the outside
• the geometric shape of the flat areas D with reduced wall thickness S1 can be as desired, as can their distribution and orientation in the ring area 9 of the holding membrane.
• the spring spokes E and the flat areas D are expediently regularly distributed in the circumferential direction

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Knitting Machines (AREA)
• Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
• Springs (AREA)
• Tension Adjustment In Filamentary Materials (AREA)
• Diaphragms And Bellows (AREA)
• Tape Measures (AREA)
• Braking Arrangements (AREA)
• Injection Moulding Of Plastics Or The Like (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7901336

Family Applications (1)

Country Status (7)

Families Citing this family (1)

Family Cites Families (12)

• 1999
  • 1999-03-17 DE DE19911943A patent/DE19911943A1/de not_active Withdrawn
• 2000
  • 2000-03-16 CN CNB008063818A patent/CN1201990C/zh not_active Expired - Fee Related
  • 2000-03-16 WO PCT/EP2000/002362 patent/WO2000055081A1/fr active IP Right Grant
  • 2000-03-16 EP EP00916966A patent/EP1163180B1/fr not_active Expired - Lifetime
  • 2000-03-16 KR KR10-2001-7011727A patent/KR100457304B1/ko not_active IP Right Cessation
  • 2000-03-16 DE DE50002363T patent/DE50002363D1/de not_active Expired - Fee Related
  • 2000-03-16 US US09/936,575 patent/US6637692B1/en not_active Expired - Fee Related
  • 2000-03-16 AT AT00916966T patent/ATE241558T1/de not_active IP Right Cessation

Non-Patent Citations (1)

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