WO1997014836A1 - Dispositif de livraison du fil - Google Patents

Dispositif de livraison du fil Download PDF

Info

Publication number
WO1997014836A1
WO1997014836A1 PCT/EP1996/004409 EP9604409W WO9714836A1 WO 1997014836 A1 WO1997014836 A1 WO 1997014836A1 EP 9604409 W EP9604409 W EP 9604409W WO 9714836 A1 WO9714836 A1 WO 9714836A1
Authority
WO
WIPO (PCT)
Prior art keywords
locking member
delivery device
abutment
thread
ring
Prior art date
Application number
PCT/EP1996/004409
Other languages
German (de)
English (en)
Inventor
Per Ohlson
Kurt Arne Gunnar Jacobsson
Original Assignee
Memminger-Iro Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Memminger-Iro Gmbh filed Critical Memminger-Iro Gmbh
Priority to DE59604253T priority Critical patent/DE59604253D1/de
Priority to KR1019980702749A priority patent/KR100282545B1/ko
Priority to US09/051,066 priority patent/US6015109A/en
Priority to EP96934622A priority patent/EP0856074B1/fr
Publication of WO1997014836A1 publication Critical patent/WO1997014836A1/fr

Links

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
    • D04B15/482—Thread-feeding devices comprising a rotatable or stationary intermediate storage drum from which the thread is axially and intermittently pulled off; Devices which can be switched between positive feed and intermittent feed

Definitions

  • the invention relates to a thread delivery device of the type specified in the preamble of claim 1.
  • a thread delivery device of this type is known from US-A-3 642 219 and has been marketed by the applicant under the name SFS / SFT for over 20 years.
  • the backstop which is only hinted at in US-A-3 642 219, is arranged between the top wall of the electric motor integrated in the storage drum and a rotary bearing of a feed element on the shaft fixed to the housing.
  • the locking member works with the inner circumference of the storage drum over a relatively large diameter.
  • the locking member is a disk made of plastic, which can be displaced between the running position and the braking position in a fork-like abutment anchored on the shaft, namely by means of that between an end face of the disk and the top cover of the engine caused by frictional drag force.
  • the abutment has a concave slideway for the disk which rises in the return direction and stops formed on both ends of the slideway.
  • the disk In the running position, the disk at least largely disengages from the braking surface provided on the inner circumference of the storage drum. If the storage drum rewinds, the disc is displaced by the drag force along the slideway into a blocking position in which it is pressed against the braking surface.
  • a return movement of the storage drum can have several causes.
  • a thread scanner provided in the feed area of the thread delivery device is spring-loaded and can, after the storage drum has stopped, pull back the incoming thread and turn the storage drum back by means of the thread.
  • the threads to be processed are mostly elastic, so that when the storage drum stops, the tension previously generated in the incoming thread passes over the storage drum want to turn the thread back.
  • a counter torque can arise which the storage drum wishes to turn back.
  • the known backstop is complex in terms of production technology, susceptible to wear and tear and can cause undesirable vibrations especially when accelerating or at higher speeds, among other things because the disk acts on an extremely large diameter and with a very large lever arm.
  • the known backstop requires an almost exactly vertical arrangement of the thread delivery device, which cannot be maintained in some applications.
  • structurally complex measures are required to prevent the disc from burning on its end face which contacts the upper cover wall of the motor, because the disc contacts the cover wall at a large distance from the axis of rotation and therefore considerable friction is to be destroyed at high speed. .
  • the invention has for its object to provide a yarn delivery device of the type mentioned, in which a structurally simple, easy-to-assemble backstop is provided, which works reliably with little wear and tear and has a long service life and does not cause any vibrations.
  • the braking surface can be set to a diameter which can be significantly smaller than the inside diameter of an optionally provided storage drum. If the rotary element shows the tendency of a return movement, then that becomes Locking member rotated relative to the abutment in a smooth rotary motion by the drag force until its counter-braking area runs outwards or inwards against the braking surface thanks to the circle which is eccentric to the axis of rotation of the rotary element and blocks the reverse movement.
  • the intervention into the blocking position takes place harmoniously and reliably, whereby a high braking power can be generated. It is particularly important that when the rotary element restarts in the correct direction of rotation, the locking member easily and forcibly releases from the braking surface and returns to the defined running position.
  • the area of engagement between the locking member and the braking surface can be designed over a large area, so that there is no excitation for vibrations in the thread delivery device.
  • the backstop works with little wear and reliably with a long service life. In general, it should be emphasized that the eccentricity and the diameter of the eccentric circle make it possible to predetermine and optimally design the characteristic curve with which the backstop takes effect or is released again.
  • the backstop is carried out on an optimally small diameter, and in particular on a diameter independent of the size of the storage drum.
  • the towing force can be predetermined precisely by dimensioning the spring force.
  • the pressure is expediently carried out against the action of gravity.
  • the thread delivery device can therefore be used in any installation position without endangering the backstop.
  • the area in which the locking member contacts the towing surface can be set relatively close to the axis of rotation of the rotating element, so that even at high rotational speeds and strong accelerations the risk of the locking member being burned is avoided, also by the ring shape, which have a relatively low specific surface pressure per unit area enables and still ensures sufficient towing power.
  • the locking element is automatically rotated into the locking position just required to prevent the return, without requiring a special stop for the locking position, it can be expedient, according to claim 4, to provide a stop for the locking member which ends ⁇ locking position defined and excessive forces on the braking surface or the rotating element prevented.
  • the embodiment according to claim 5 is particularly expedient, in which the motor is fixedly arranged in the housing and the backstop is well encapsulated and separated from the working area of the storage drum, in which contamination and fluff are unavoidable. Since the locking member has no cooperation with the inside diameter of the storage drum, the diameter of the braking surface can be chosen small enough to exclude vibrations at high speeds and strong accelerations in modern thread delivery devices.
  • the motor shaft is supported on the housing against a return via the rotating backstop.
  • the backstop does not co-operate with the rotary movement of the rotating element, but only acts upon a backward movement in order to block the motor shaft via the braking surface attached, for example, to the motor shaft.
  • the locking member cooperates with a brake ring which u.a. A high eremic effect due to the material.
  • a brake ring could be attached directly to or in the locking member (claim 9).
  • a good backstop is also achieved with a braking surface that is only structured, for example knurled. This braking surface can be arranged in a metallic body, for example in the housing or in a housing insert.
  • the embodiment according to claim 11 is technically simple to manufacture. Molded plastic parts are distinguished by high dimensional accuracy, low weight and low wear. Since the locking member is pressed against the towing surface by precisely adjustable spring force, self-lubricating plastic qualities can be used, which ensure easy rotation of the locking member even over a long service life. The self-lubricating effect has no adverse effect on the braking effect with the braking surface, because a quick-acting forced intervention can be produced there anyway by the eccentric displacement movement of the locking member.
  • the embodiment according to claim 12 is structurally simple and ensures low-wear work even over a long service life.
  • the spring between the annular disc and the hub is arranged as an integral part of the backstop.
  • the projections or the circumferential bead are an assembly aid for a pre-mintable structural unit, because the circular disk cannot fall off the ring flange under the force of the spring. In operation, the circular ring disk does not normally reach the projections or the peripheral bead.
  • 1 is a side view, partly in section, of a yarn delivery device with a backstop, 2 the backstop in a section and on an enlarged scale, in the barrel division,
  • FIG. 4 is an axial plan view of a locking member of the backstop, which fits the abutment of FIG. 3, and
  • Fig. 5-8 schematic detailed variants of the backstop.
  • a yarn delivery device F preferably a yarn delivery device F for a knitting machine, has a stationary housing G on which a storage drum T is rotatably mounted on the underside and can be driven to rotate about an axis of rotation X by a motor M in a predetermined direction of rotation.
  • the motor M can be switched on and off, specifically by means of signals which are generated by a scanning device D in a housing boom 1 as a function of the size of a thread supply (not shown) formed on the storage drum T.
  • the thread (not shown) coming from a supply spool (not shown), which is fed to the storage drum T is passed through stationary thread eyelets 2 through a thread brake 3 and, under the supervision of a sensing element 5, reaches the circumference of the storage drum T.
  • An inclined feed element V pushes it each winding wound on the storage drum T in Fig. 1 downward, so that a thread supply is formed from several turns.
  • the thread intended for consumption is drawn off at the top of the storage drum.
  • a backstop R is provided, namely between an upper cover wall 6 of the housing G and the upper end of a motor shaft H.
  • the backstop R contains a non-rotatably connected to the motor shaft H.
  • Abutment W and a re Locking member S which is mounted in a relatively rotatable manner and is loaded upwards by a weak screw spring 4 and serves to cooperate with a braking surface B of an insert 7 provided in the top wall 6, namely by a return or a return movement of the storage drum T. or to prevent the motor shaft H after a standstill.
  • the abutment W is an annular body AI, consisting of a hub 8, which is non-rotatably fitted with a non-circular inner bore 9 onto the matching end 10 of the motor shaft H, a radial flange 11, which has a spring seat 12 defined, and an axial ring flange 14 with a cylindrical outer peripheral surface 15, the axis XI of which is eccentric with respect to the axis of rotation X of the motor shaft H. Furthermore, a cutout 17 which is delimited in the circumferential direction is formed in the annular flange 14 and (FIG. 3) defines two stops 18 and 18 'spaced apart in the circumferential direction. A circumferential bead 16 is formed in the end region of the ring flange 14.
  • the locking member S which is rotatably mounted on the abutment W relative to this, is also an annular body A2, specifically an annular disc 19 with an inner bore 20 and a cylindrical outer circumference 21, which is intended for cooperation with the braking surface B.
  • the central axis of the peripheral surface 21 at least approximately coincides with the axis of rotation X.
  • a spring receiving groove 13 for the helical spring 4 is formed which is concentric with the peripheral surface 21 and which is supported with its other end in the spring seat 12 of the flange 11 and the annular disk 19 with at least part 22 of its other Presses end face against a trailing surface 23 fixed to the housing.
  • a nose 26 protrudes inward, which defines stops 27 and 27 'according to FIG Interact stops 18 and 18 'to set a barrel position and a locked position.
  • the 3remsflache B and the drag surface 23 are included in the insert 7, which is fixed in the top wall 6. It is conceivable to arrange the towing surface 23 and the braking surface 21 directly in the top wall 6.
  • the braking surface B is provided on a brake ring 24 made of a friction-active material, such as rubber, elastomer or another plastic, which is fixed in a socket 25 of the insert 7.
  • a radial play Y is provided between the peripheral surface 21 and the braking surface B.
  • the two ring bodies AI, A2 are expediently plastic parts, for example injection molded parts.
  • the insert 7 can be made of metal, for example steel.
  • the braking surface B could also be formed directly by the inner circumferential surface of the socket 25, which then expediently has a roughened surface structure, for example knurling. If necessary, the peripheral surface 21 could also be structured in order to increase the frictional engagement.
  • the locking member S according to FIG. 4 is seated in the rotational position shown in FIG. 4 on the ring flange 14 of the abutment W, which is in the rotational position shown in FIG. 3.
  • the nose 26 abuts the stop 18 'against the stop 18'.
  • the circumferential surface 21 is then essentially concentric with the axis of rotation X and faces the braking surface B (FIG. 2) with the radial play Y.
  • the motor shaft H driven counterclockwise in FIGS. 3 and 4 takes the locking member S with it via the abutment W without the braking surface B coming into contact.
  • the locking member S against the drag surface 23rd pressed so that a permanent drag force acts in the locking member S by frictional contact, which holds it clockwise with the stop 27 'on the stop 18'.
  • the ring body A2 is rotatably mounted on the top wall 6 or in the insert 7, whereas the ring body AI rotatably comprises the motor shaft H or its end 10 (which then has a cylindrical outer circumference), expediently again with a Radial game.
  • the end surface 23 'of the motor shaft H which cooperates with the end surface 22' of the annular body AI under the pressure of the spring 4, then serves as the drag surface.
  • the braking surface B can then be provided either on the outer circumference of the motor shaft H or in the inner bore 9 of the ring body AI.
  • the ring body A2 forms the abutment W and the ring body AI the locking member S.
  • FIGS. 2, 3 and 4 is shown schematically, in which the locking member S is rotatably mounted on the outside of the abutment W and cooperates with the braking surface B.
  • Fig. 6 the kinematic reversal is indicated, in which the abutment W is arranged on the outside of the locking member S and (indicated by crosses) rotatably supported.
  • the locking member S is rotatable relative to the motor shaft H. The locking effect is brought about between the inner bore 9 and the braking surface B or the outer circumference of the motor shaft H.
  • a braking surface area 21 ′ which is limited in the circumferential direction and is intended to cooperate with the braking surface B, is formed on the outer circumference 21 of the locking member S.
  • a circumferentially limited, inwardly projecting braking surface region 9 ' is formed, which is used for cooperation with the braking surface B, in present case on the motor shaft H, is determined.
  • the abutment W is an annular body with a non-circular outer circumference, which simplifies the determination of the abutment.
  • the braking surface area 21 'or 9' can also have a curvature whose center of curvature does not coincide with the center of the cylinder surface 21 or 9, i.e. the braking surface area 21 'or 9' could be curved more or less in order to achieve a special braking effect.
  • the backstop shown in FIG. 1 could also be arranged below the motor M. Conveniently, however, the backstop R should be encapsulated and away from the sphere of influence of Soiling or lint, which are unavoidable when processing thread material, must be separated.
  • the diameter at which the locking member interacts with the braking surface B is advantageously substantially smaller than the diameter "of the storage drum T or its inner diameter.
  • the size of the contact area between the locking member and the drag surface 23 or 23 ' should be chosen such that Under the pressure of the spring 8, a drag force that is sufficient for the function is ensured, but overheating or burning of the locking member is excluded.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Braking Arrangements (AREA)

Abstract

L'invention concerne un dispositif de livraison du fil, notamment pour des métiers à tricoter, comportant un boîtier fixe (G), un élément rotatif pouvant être entraîné au moyen d'un moteur (M) et servant à l'enroulement d'un fil, ainsi qu'un élément mécanique pour bloquer les mouvements en arrière de l'élément rotatif, qui comprend un élément de blocage pouvant être déplacé contre une butée (W) entre une position de marche et une position d'arrêt, et pouvant être appliqué sur une surface de freinage (B). Cet élément de blocage est exposé à une force d'entraînement produite par un contact de friction, lorsque l'élément rotatif tourne, quel que soit le sens de rotation, et peut être placé par ladite force d'entraînement par rapport à la butée (W) dans une position de marche ou une position d'arrêt, en fonction du sens de rotation. La butée (W) et l'élément de blocage sont formés par deux éléments annulaires imbriqués l'un dans l'autre et pouvant tourner l'un par rapport à l'autre autour de l'axe de rotation (X) de l'élément rotatif. La zone de contact entre les éléments annulaires est formée par au moins une partie d'un cercle excentrique par rapport à l'axe de rotation de l'élément rotatif. L'élément de blocage coopérant avec la zone de freinage (B) présente à sa périphérie (21) une zone de freinage (21') délimitée sur sa périphérie.
PCT/EP1996/004409 1995-10-16 1996-10-10 Dispositif de livraison du fil WO1997014836A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE59604253T DE59604253D1 (de) 1995-10-16 1996-10-10 Fadenliefergerät
KR1019980702749A KR100282545B1 (ko) 1995-10-16 1996-10-10 실 공급기
US09/051,066 US6015109A (en) 1995-10-16 1996-10-10 Thread feed device
EP96934622A EP0856074B1 (fr) 1995-10-16 1996-10-10 Dispositif de livraison du fil

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9521128A GB2306174B (en) 1995-10-16 1995-10-16 Yarn feeder
DE19538449A DE19538449A1 (de) 1995-10-16 1995-10-16 Fadenliefergerät
DE19538449.0 1995-10-16

Publications (1)

Publication Number Publication Date
WO1997014836A1 true WO1997014836A1 (fr) 1997-04-24

Family

ID=26019517

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1996/004409 WO1997014836A1 (fr) 1995-10-16 1996-10-10 Dispositif de livraison du fil

Country Status (3)

Country Link
DE (1) DE19538449A1 (fr)
GB (1) GB2306174B (fr)
WO (1) WO1997014836A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW201433667A (zh) * 2013-02-21 2014-09-01 J & T Glory Internat Co Ltd 圓編織機之連桿裝置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3642219A (en) * 1969-02-26 1972-02-15 Rosen Karl I J Thread storage and delivery device for textile machines
DE2725185B1 (de) * 1977-06-03 1978-09-28 Iro Ab Fadenspeicher- und -liefervorrichtung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3642219A (en) * 1969-02-26 1972-02-15 Rosen Karl I J Thread storage and delivery device for textile machines
DE2725185B1 (de) * 1977-06-03 1978-09-28 Iro Ab Fadenspeicher- und -liefervorrichtung

Also Published As

Publication number Publication date
GB9521128D0 (en) 1995-12-20
DE19538449A1 (de) 1997-04-17
GB2306174A (en) 1997-04-30
GB2306174B (en) 1999-06-16

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