US3696468A - Double apron drafting arrangement for spinning machines - Google Patents

Double apron drafting arrangement for spinning machines Download PDF

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Publication number
US3696468A
US3696468A US845161A US3696468DA US3696468A US 3696468 A US3696468 A US 3696468A US 845161 A US845161 A US 845161A US 3696468D A US3696468D A US 3696468DA US 3696468 A US3696468 A US 3696468A
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United States
Prior art keywords
apron
cradle
roll
rolls
plane
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Expired - Lifetime
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US845161A
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English (en)
Inventor
Andre Lattion
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Maschinenfabrik Rieter AG
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Maschinenfabrik Rieter AG
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Application filed by Maschinenfabrik Rieter AG filed Critical Maschinenfabrik Rieter AG
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    • 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
    • D01H13/16—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to reduction in material tension, failure of supply, or breakage, of material
    • D01H13/18—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to reduction in material tension, failure of supply, or breakage, of material stopping supply only
    • D01H13/182—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to reduction in material tension, failure of supply, or breakage, of material stopping supply only by raising or lifting of one of the drafting cylinders, e.g. by removing of the loading means
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
    • D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
    • D01H5/26—Drafting machines or arrangements without fallers or like pinned bars in which fibres are controlled by one or more endless aprons

Definitions

  • Cl ..19/255 tom delivery r0115 causes the cage to aummai-ically [51] Int. Cl. ..D0lh 5/86 pivot a y m th deliv y r l s so as to pr ent [58] Field of Search ..19/255, 256, 254, 266, 267, r h r f ing f he roving.
  • the cradle avoids any 19/244, 253 pressure being imposed on the bottom apron which might otherwise cause breakage of the apron.
  • double apron drafting arrangements have been provided'with a detachable top apron cradle.
  • the cradle has been supported by the bottom apron and has been shiftable from a working position to a certain idle position and back, the bottom apron being exposed openly in this movement.
  • a disadvantage of this known device is that in case of lap formation on the bottom delivery roll adjacent to the aprons, the top apron cradle must be turned around the longitudinal axis of the bottom apron roll and be taken off while the lap must also be eliminated.
  • the invention provides a double apron drafting arrangement for a spinning machine with a cradle for guiding top and bottom aprons into close vicinity of a nip of a pair of delivery rolls.
  • This cradle is supported by the bottom apron roll and is pivotable around the longitudinal axis of the bottom apron roll from a working position to an idle position and back.
  • the cradle which tensions both aprons is, in its working position, secured against tilting downwardly from the drafting zone plane by a support and against tilting upwardly from the drafting zone plane by a holding means.
  • the holding means is constructed to release the cradle under a pressure exerted against the bottom apron caused by a lap formation on the bottom delivery roll so that the cradle by forcing the holding means automatically turns into the idle position if lap formation occurs.
  • FIG. 1 illustrates a cross-sectional view of a double apron drafting arrangement on a support and pressure arm with a cradle for the bottom and top aprons in working position according to the invention
  • FIG. 2 illustrates a cross-sectional view of the double apron drafting arrangement of FIG. 1 with the cradle for the bottom and top aprons in an idle position;
  • FIG. 3 illustrates a cross-sectional view of a modified double apron drafting arrangement with a split cradle
  • FIG. 4 illustrates a cross-sectional view of the drafting arrangement of FIG. 3 in an idle position
  • FIG. 5 illustrates a perspective view of a cradle according to the invention.
  • a drafting arrangement for a spinning machine which is constructed as is known for drafting a roving 1 includes a pair of take-in rolls 2,3 which define a pre-drafting zone 4with a top apron roll 6 and a bottom apron roll 7.
  • a main drafting zone is provided in the path of the roving I and is defined by the apron rolls 6,7 a top apron 8, a bottom apron 9 and a pair of delivery rolls 10, 1 l.
  • the bottom apron roll 7 which is aknurled roll supports a cradle 5 and drives the bottom apron 9 about a bottom apron guide rail 12 at the front part of the cradle 5 in the draft direction.
  • the top apron 8 is driven by the bottom apron 9 and moves around the top apron roll 6 which is a pressure roll and is driven by the apron 8. Also, the top apron 8 moves around a top apron guide rail 13 at the front part of the cradle 5.
  • the top take-in roll 2 and the top delivery 10 are rigidly guided by pressure saddles 14, 15 respectively, saddle 14 being connected rigidly to a distributor 16 and saddle 15 to a distributor 17.
  • the distributors 16, 17 are commonly supported via an element (not shown) in a support and pressure arm 18 by a pivot pin 19.
  • a middle pressure saddle 20 which in working position has a recess 21 which contacts the axle 22 of the top apron roll 6.
  • the saddle 20 is also turnable as the distributor 17 pivots around the pivot pin 19.
  • One double apron drafting arrangement is arranged to the right and to the left of the support and weighting arm 18. For purposes of simplicity, however, only one of the two double apron drafting systems is shown.
  • the pressure saddle 20 surrounds axle 22 with its recess 21 from the top and with a leg 23 at the front in the draft direction. As the axle 22 is thus secured against pivoting around the bottom apron roll 7 along a path defined by a pivoting circle 24 passing through the center of the axle 22, the cradle 5 is secured against tilting downwardly from the drafting zone plane. To the rear, the pressure saddle 20 covers the axle 22 with the recess 21 over a short distance only, ending at an end point 24 situated outside the pivoting circle 24. Furthermore, a spring hoop 25 is secured to the underside of the pressure saddle 20 and extends rearwardly therefrom parallel to the pivoting circle 24 and is bent into the draft direction below the drafting zone plane in order to take up the axle 22 as described further in the following.
  • axle 22 While the lap on bottom delivery roll 11 increases in size and thus increasingly lifts the front part of cradle 5, axle 22 is pushed backwards with respect to the drafting direction, is forced over the end point 24 of the recess 21 in the saddle 20 and slips backwardly out of the recess 21. The axle 22 then moves along the pivoting circle 24 after slipping out of the recess 21. As the front part of the cradle 5 is lifted, the top delivery roll is also lifted and turns the pressure saddle around the pivot pin 19 along a pivoting circle S passing through the end point 24 into the direction of the pivoting circle S A along which axle 22 turns. Axle 22 and end point 24 of recess 21 thus tangentially slide past each other in opposite directions.
  • the front part of cradle 5 automatically tilts upwardly from the drafting zone plane and tears off the roving 1 between the front part of the cradle 5 and the nip of the pair of delivery rolls 10, 11. Further increase of the lap on the bottom delivery roll 1 1 thus is suppressed automatically.
  • axle 22 has slipped out of the rebess 21 of pressure saddle 20 completely due to the growing lap formation 26 on the bottom delivery roll 11.
  • Cradle 5 which supports the axle 22 has pivoted backwardsaround the longitudinal axis of the bottom apron roll 7 and is held by virtue of the spring hoop catching the axle 22.
  • the spring hoop 25 keeps the top apron 8 which is brought into the vicinity of the take-in bottom roll 3 due to the pivoting motion of cradle 5, from contacting the take-in bottom roll 3.
  • the supply of roving I to the pair of delivery rolls 10, 11 is interrupted.
  • the top apron roll 6 no longer exerts pressure against the bottom apron roll 7 and the roving l is no longer drawn in between the top apron 8 and the bottom apron 9.
  • the roving l which is still drawn in by the pair of take-in rolls 2, 3 drops onto the machine frame or onto a cover plate (both not shown) where sufficient room is available for depositing any roving material 1 still drawn in over prolonged periods until the lap is eliminated.
  • the cradle consists of a part 27 which guides the top apron 8 and of a part 28 which guides the bottom apron 9.
  • the part 27 has, as seen in the draft direction, at the front lateral walls 29 extending downwardly and provided with recesses 32 (only one being shown).
  • the part 27 is supported by pins 33 (only one being shown) extending outwardly from the lateral walls of the part 28 into the recesses 32.
  • These parts 27, 28 are detachably connected at the front by the recesses 32 and the pins 33.
  • the back, with respect to the draft direction, of guide part 27 is supported by the axle 22 of the top apron roll 6.
  • the arrangement consisting of the two guide parts 27, 28 can pivot around the longitudinal axis of the bottom apron roll 7 as the guide part 28 is supported by the bottom apron roll 7.
  • a spring hoop 30, together with the spring hoop 25, is fixed to the support and pressure arm 18 by means of a holding screw 31.
  • the spring hoop 30 surrounds the axle 22 in the front and from below with respect to the draft direction. If the pressure arm 18 is lifted, the spring hoop 30 will carry the axle 22 upwardly while the guide part 27 is lifted from guide part 28 since their connection, as mentioned above, becomes detached.
  • the lateral walls 29 which extend downwardly, are guided by the pin 33 during the lowering of the support and pressure arm 18.
  • the guide parts 27, 28 are held together at the front part of the split cradle by the connecting elements mentioned be fore and at the back part by the pressure exacted from the pressure roll saddle 20 on the axle 22 of the top apron roll 6.
  • the two guide parts 27 28 are held together at their back parts by the spring hoop 25 receiving the axle 22 and pressing the top apron roll 6 in the direction of the bottom roll 7, whereas at their front part the aforementioned connecting elements maintain the connection (FIG. 4).
  • the support of the pressure saddle 20 on the axle 22 in the working position corresponds to the one shown in FIG. 1.
  • the split cage undergoes the same phases of movement as the cradle mentioned above in the case of lap formation on the bottom delivery roll 1 1.
  • the split cradle as shown in FIG. 4 is forced over the end point 24 of the supporting recess 21 of the pressure saddle 20, automatically tilts back and the lap formation is interrupted.
  • the holding means for holding the cradle 5 in place until a detrimental lap formation occurs is thus constituted primarily by the pressure saddle 20 and the recess 21 with the accompanying end point 24 and secondarily by the distributor 17 and support arm 18.
  • the spring hoop 25 serves to limit the pivoting of the cradle 5 so as not to contact the take-in rollers 2, 3.
  • a cradle mounted on one of said apron rolls and supporting said aprons in tension thereon
  • a pressure saddle disposed to pivot about a pivot point located between the plane of said delivery rolls and the plane of said apron rolls, said pressure saddle having the other of said apron rolls disposed therein to define a working position of said other apron roll and being pivotal about said pivot point in a direction towards said delivery rolls in response to a predetermined movement of one of said delivery rolls from the other to permit said other apron roll and said cradle to pivot about said one apron roll in a direction away from said pressure saddle into an idle position, said one delivery roll being located on the same side of said drafting plane as said pressure saddle.
  • a double apron drafting arrangement for spinning machines, the combination of a pair of delivery rolls forming a nip in a drafting zone plane; a bottom apron roll; a cradle supported on said bottom apron roll, said cradle being pivotally mounted about the longitudinal axis of said bottom apron roll between a working position and an idle position; a top apron and a bottom apron supported and tensioned on said cradle for guiding into close vicinity to said nip with said cradle in said working position; a top apron roll having an axle mounted in said cradle; a pressure saddle surrounding said axle from above and in front with respect to the draft direction to within a pivoting circle extending through the axis of said top apron roll for securing said cradle in said working position against tilting downwardly from said drafting zone plane, and in back to an endpoint situated above said pivoting circle for releaseably holding said cradle in
  • a double apron drafting arrangement as set forth in claim 2 further including a pair of take-in rolls and a spring hoop extending from said saddle to the drafting zone plane parallel to and above said pivoting circle, said spring hoop being fixed to said saddle and bent at the free end thereof into the draft direction to partially surround said axle of said top apron roll whereby said hoop holds said cradle in said idle position against further upward tilting and out of contact with said take-in rolls.
  • said cradle includes a first guide part guiding said top apron and supported on said top apron roll, and a second guide part guiding said bottom apron and supported on said bottom apron roll, said guide parts being detachably connected to each other at the front with respect to the draft direction.
  • a double apron drafting arrangement as set forth in claim 4 further including a first spring hoop connected to said support and pressure arm surrounding said axle of said top apron roll in the front and from below with respect to the draft direction, and a second spring hoop extending off from said saddle to said drafting zone plane parallel to and above said pivoting circle, said second spring hoop being fixed to said saddle and bent at the free end thereof into the draft direction to hold said guide parts together in said idle position while acting in the direction of said bottom apron roll.
  • a pair of delivery rolls forming a nip in a drafting zone plane, a bottom apron roll, a cradle supported on said bottom apron roll, said cradle being pivotally mounted about the longitudinal axis of said bottom apron roll between a working position and an idle position, a top apron and a bottom apron supported and tensioned on said cradle for guiding into close vicinity to said nip with sald cradle in working position, a top apron roll mounted in said cradle, a support for securing said top apron roll and cradle in said working position against tilting downwardly from said drafting zone plane, and means for releasing said cradle and top roll from said support to allow tilting of said cradle upwardly from said plane under a pressure against said bottom apron exerted by a lap formation on the bottom roll of said
  • top apron roll has an axle supported in said cradle
  • said support comprises a pressure saddle surrounding said axle from above and in front with respect to the draft direction to within a pivoting circle centered in the axis of said top apron roll and in back to an endpoint situated outside said pivoting circle
  • said means includes a support and pressure arm connected to said saddle, said arm being shiftable upwardly with respect to said drafting zone plane.
  • a double apron drafting arrangement as set forth in claim 7 further including a pair of take-in rolls and a spring hoop, said spring hoop being fixed to said saddle and bent to partially surround said top apron roll whereby said hoop holds said cradle in said idle position against further upward tilting and out of contact with said take-in rolls.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
US845161A 1968-07-26 1969-07-28 Double apron drafting arrangement for spinning machines Expired - Lifetime US3696468A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1157268A CH471250A (de) 1968-07-26 1968-07-26 Zweiriemchen-Streckwerk für Spinnmaschinen

Publications (1)

Publication Number Publication Date
US3696468A true US3696468A (en) 1972-10-10

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US845161A Expired - Lifetime US3696468A (en) 1968-07-26 1969-07-28 Double apron drafting arrangement for spinning machines

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US (1) US3696468A (de)
CH (1) CH471250A (de)
DE (1) DE1935412B2 (de)
FR (1) FR2013798A1 (de)
GB (1) GB1281714A (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3927936A1 (de) * 1988-09-29 1990-04-05 Fehrer Ernst Vorrichtung zum herstellen eines garnes
DE19716981A1 (de) * 1996-05-13 1997-11-20 Rieter Ag Maschf Walzeneinrichtung zum Transportieren von Textilfasermaterial
DE102009030367A1 (de) * 2009-06-25 2010-12-30 Oerlikon Textile Components Gmbh Oberriemchenhalter für Streckwerke von Spinnereimaschinen
FR3118121B1 (fr) 2020-12-21 2023-06-16 Psa Automobiles Sa Bloc optique de véhicule, à pièce de support monobloc participant à des fonctions photométriques

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2206432A (en) * 1937-11-23 1940-07-02 Schofield John Mechanism for drawing fibers in textile machines
GB524886A (en) * 1939-02-10 1940-08-16 John Schofield Improvements in mechanism for drawing fibres in textile machines
DE807372C (de) * 1948-10-02 1951-06-28 Zellwolle Lehrspinnerei G M B Riemchenkaefig fuer Doppelriemchen-Streckwerke
US2696026A (en) * 1954-12-07 Noguera
US2717425A (en) * 1953-04-17 1955-09-13 Casablancas High Draft Co Ltd Drafting apparatus for textile fibres
US2810938A (en) * 1953-02-05 1957-10-29 Dixon Lubricating Saddle Co Spinning frame
US2896270A (en) * 1956-07-23 1959-07-28 Franklin A Young Top roll supporting and weighting apparatus for textile drafting machines

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2696026A (en) * 1954-12-07 Noguera
US2206432A (en) * 1937-11-23 1940-07-02 Schofield John Mechanism for drawing fibers in textile machines
GB524886A (en) * 1939-02-10 1940-08-16 John Schofield Improvements in mechanism for drawing fibres in textile machines
DE807372C (de) * 1948-10-02 1951-06-28 Zellwolle Lehrspinnerei G M B Riemchenkaefig fuer Doppelriemchen-Streckwerke
US2810938A (en) * 1953-02-05 1957-10-29 Dixon Lubricating Saddle Co Spinning frame
US2717425A (en) * 1953-04-17 1955-09-13 Casablancas High Draft Co Ltd Drafting apparatus for textile fibres
US2896270A (en) * 1956-07-23 1959-07-28 Franklin A Young Top roll supporting and weighting apparatus for textile drafting machines

Also Published As

Publication number Publication date
CH471250A (de) 1969-04-15
DE1935412B2 (de) 1977-01-27
FR2013798A1 (de) 1970-04-10
GB1281714A (en) 1972-07-12
DE1935412A1 (de) 1970-01-29

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