US3740798A - Apparatus for mounting carrier arms in spinning machines - Google Patents

Apparatus for mounting carrier arms in spinning machines Download PDF

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Publication number
US3740798A
US3740798A US00121719A US3740798DA US3740798A US 3740798 A US3740798 A US 3740798A US 00121719 A US00121719 A US 00121719A US 3740798D A US3740798D A US 3740798DA US 3740798 A US3740798 A US 3740798A
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United States
Prior art keywords
carrier arm
lever
housing
pin
carrier
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
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US00121719A
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English (en)
Inventor
F Brichta
F Driesel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SKF GmbH
Original Assignee
SKF Kugellagerfabriken GmbH
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Filing date
Publication date
Priority claimed from DE19702011641 external-priority patent/DE2011641C/de
Application filed by SKF Kugellagerfabriken GmbH filed Critical SKF Kugellagerfabriken GmbH
Application granted granted Critical
Publication of US3740798A publication Critical patent/US3740798A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • D01H5/56—Supports for drafting elements
    • D01H5/565—Top roller arms

Definitions

  • top roller carrier for spinning yarn is mounted within a support and a lever is pivoted at one end to the support.
  • the carrier is pivoted at a first point to the lever, and at a second point to the support.
  • the lever is adapted to raise and lower the arm so that the pivot points move in arcuate paths, into closed and open positions.
  • the present invention relates to apparatus for mounting carriers of top rollers in the drawing mechanism of a spinning machine.
  • Carrier arms of conventional drawing mechanisms are shown in German Pat. No. 1,088,850 and U. S. Pat. No. 3,212,139 to which reference can be made.
  • a carrier arm is arranged with a plurality of supports mounting at their ends top rollers which are adapted to engage respective associated bottom rollers to form the drawing plane for twisting of sliver fibers.
  • the carrier arm extends with a rectangular open or U- shaped housing support and is pivoted about a pin secured in a straight slot formed in the latter walls of the housing support.
  • the carrier arm is linked to an operating lever which has its end mounted about a pin located in the housing support above that of the carrier arm. The lever is guided, however, in an arcuate slot so that it may be raised and lowered to carry with it the carrier arm.
  • the shape and inclination of the two slots must be chosen so that when the lever and carrier are unlocked or opened the upward movement of lever and carrier arm does not cause the top rollers to roll or have a translatory movement relative to the associated rollers. This is necessary to minimize disturbance of the sliver fibers located therebetween. Simultaneously, however, the forwardmost top roller (in the direction of fiber movement) must initially remain in contact with its roller, so that the already spun fibers are not prematurely released and the twist lost. On closing the mechanism, i.e. on downward movement of the lever and carrier arm, the upper rollers must first rest without pressure on the lower rollers for the same reasons. The actual loading or locking of the carrier arm in operative position must thereafter be accomplished by forcibly depressing the lever.
  • apparatus for mounting carrier arms of a drawing mechanism for a spinning machine which comprises a fixed support housing in which the ends of the carrier arm and operating lever is mounted.
  • the lever is pivotally secured to the housing about a fixed pin while the carrier arm is pivoted at one point to the lever and at another to the housing so as to provide an arcuate path of travel for the pivot points on raising or lowering of the lever.
  • pivot points are arranged in an array in which the pivot link between the carrier and the lever is offset slightly below the pivot pin of the lever and the support and the two pivot points of the carrier arm are located on opposite sides of a line passing through the centers of the arcuate paths.
  • the carrier comprise a link in a four bar linkage system so that the point of travel of a given top roller is defined.
  • FIG. 1 is a side elevation view of a drawing mechanism, in closed position
  • FIG. 2 is a view of the mechanism in partially loaded or open position
  • FIG. 3 is a side section in enlarged form of the carrier arm and support shown in FIG. 1, I
  • FIG. 4 is a sectional view taken along line 4--4 of FIG. 3,
  • FIG. 5 is a view similar to FIG. 3 showing the mechanism in partial open position, as in FIG. 2,
  • FIG. 6 is a view of the mechanism fully opened and in locked position
  • FIGS. 7 and 8 are sectional views taken along line 77 of FIG. 6 showing the locking arrangement in closed and open positions respectively.
  • FIG. 1 shows a stationary housing support 10 which is normally fixed to the machine frame.
  • a holding rod 12 extends through the housing 10 and holds a multiplicity of carrier arms 18 on which are arranged the rollers of a drawing mechanism of aspin'ning machine.
  • Each carrier arm 18 is mounted separately.
  • a pin 14 is mounted in housing 10 and holds an operating lever 16 for each carrier arm 18. The end of the carrier arm 18 (to the right in FIG. 1) is also received and supported in the housing 10, and has depending walls 18.
  • the carrier 18 supports a plurality of top roller supporting mounts 20, 22 and 24.
  • Each supporting mount has a link 28, 30 and 32 respectively pivoted counterclockwise about a pin 26.
  • the links each have a saddle in which the top roller is resiliently held by a spring (FIG. 3).
  • a preferred structure for the top roller supports is shown and fullydescribed in co-pending application of the assignee hereto of Franz Fuchs, Ser. No. 120,535 based upon German application P 20 104.6 filed Mar. 4, l970, to which reference for details can be made.
  • Each top roller is opposed by a bottom roller 40, 42 and 44 respectively, which are themselves rotatably journalled in a stationary arm 46.
  • the drawing mechanism appears as a conventional three roller device (in which belts may be incorporated) defining a common tangential plane between the rollers through which fibers, slivers or the like are moved in the direction of arrow A and spun in conventional manner.
  • FIG. 3 The structural details of the carrier supporting assembly can be seen in FIG. 3.
  • the rear end only of the lever 16 and upper carrier 18 is shown and the rearmost support arm 20 and associated rollers 34 and 40 are indicated in dotted lines.
  • both the lever 16 and the carrier arm 18 are of reverse U-shaped cross section.
  • the carrier arm 18 is pivotally mounted at its upper end about a pin 50 which is secured in the lever 16 and at its lower end by means of a second pin 52 to a pair of arcuate levers 54 which itself is pivotally secured at its arcuate other end to the support housing 10 by means of a fixed bolt 56.
  • the entire apparatus is symmetrical to a median plane and the two lugs 54 are identical, being joined at their ends by sleeve 58 and sleeve 60 located about the pins 56 and 52 respectively.
  • the levers 54 are shaped in such a manner that they rest on the supporting rod 12 when the carrier arm 18 is placed in the operating position, as illustrated in FIG. 3.
  • leaf springs 62 are fastened at one end about the pivot 50 of the carrier arm 18.
  • the free ends of the leaf springs 62 carry laterally extending pins 64.
  • the pins 64 and springs 62 move with the carrier arm.
  • the pins 64 are normally biased to ride against the inner surface of the support 10 under the action of the leaf springs 62 when the carrier is in the operation position (FIG. 3) and when the carrier is moved through all other positions with the exception of the upper terminal or locked position when it seats with a hole 80 bored into the wall of housing 10 as will be hereinafter described.
  • the leaf springs are freely mounted on the pin 50 and are separated by a sleeve 68 surrounding the pin.
  • an approximately S- shaped flexible torsion leaf spring 72 is attached to the rear wall of the housing 10 by means of two rivets 70.
  • the spring 72 extends into contact and cooperates with the pin 52 or its sleeve 60 to resiliently load the linkages connecting the pivots 14, 50, 52 and 56 when the lever 16 is initially partially-pivoted as will hereinafter be explained so that the carrier arm is predisposed into its closed and operating position.
  • the initial partial loading position described above and shown in FIG. 5 By chosing the rate of torsion spring 72 at a predefined level so that on its contact with the pin 52 and its sleeve 60 the torque exerted by it is balanced with the torque exerted by the spring which biases the roller 38, the initial partial loading position described above and shown in FIG. 5, can be readily defined and determined.
  • the drawing mechanism is arranged so that during drawing operation the top rollers 32, 34 and 38 rest upon their associated rollers with a force approximating 30 K,,. In the partial load position, however, the roller 38 is caused to rest on the roller 44 with a force of only 5 K this being obtained by balancing the torques of the springs and the linkage system described.
  • a partial loading position is necessary in order to prevent the deformation of the roller bodies when the operation of the mechanism is temporarily stopped. Otherwise the large static pressure of the rollers against each other would distort their circular cross section.
  • a partial loading is required at least for one roller, in order to hold the fiber sliver in place and to prevent run through of the fiber and to avoid the loss of the twist.
  • FIG. 7 shows that the pin 50 passes through an elongated slot 82 in the operating lever 16 which is also shown in FIG. 3.
  • This arrangement provides sufficient lost motion between the carrier and the lever so that even on continued upward movement of the lever, beyond the locking position, the lock is not released and the carrier is not moved either.
  • the locking mechanism thus functions automatically when holes 66 and 80 are aligned.
  • the two leaf springs 62 are offset below their points of attachment with the pin 50, forming a shoulder or bend 84. This prevents the car rier arm 18 from being moved during the initial portion of the downward movement of the operating lever 16 and the pins 64 remain in holes 80.
  • the lower marginal areas or edges 86 of the lever 16, seen in FIGS. 7 and 8, serve as unlocking elements for the leaf springs 62.
  • the edges 86 engage with the shoulders 84 of the leaf springs and with the application of a small degree of force cause the springs to recede and remove the pins 64 from the holes 80.
  • the carrier arm 18 and the lever 16 can be moved downwardly from the position of FIG. 6 to that of FIG. 3 and until the top rollers abut against the lower rollers so that the forces of reaction of the latter exert a torque on the pin 50 relative to the pin 14 in a counter-clockwise direction.
  • the carrier arm 18 constitutes an element of a four bar linkage system which precisely defines a path of predetermined direction for a point on the carrier arm.
  • the carrier arm is mounted to pivot about two points, both of which are located on the bottom of the carrier arm or facing the top rollers and both of which move in their own arcuate or circular paths.
  • the first of the pivot points 50 as the connecting link between it and the operating lever special buide elements and complex constructions are avoided.
  • the magnitude of the compensating movement of the carrier arm may then be determined in a simple manner, provided that the pivot point does not shift radially of the circular path. This also prevents the axial translation, or rolling of the top and lower rollers with respect to each other, on lifting of the carrier arm.
  • the arcuate lever 54 by which the second carrier arm pivot point 52 is guided also has great advantage.
  • lever 54 can be replaced by a pin or key arm extending from the end of the carrier arm, which pin or arm could ride within a slot or keyway of arcuate shape formed or mounted on the housing wall. The same may be mounted directly on the holding rod.
  • the described linkage system has still another advantage, in that it provides a so-called overthe-center crank by which it is possible to pass through a particular point in the path of movement, after which the carrier arm becomes automatically closable by the operation of the forces of reaction of the lower rollers. This insures that the carrier arm will securely close when the operating lever is depressed for this intention.
  • the two pivot points are located on opposite sides of a line passing through their arcuate path centers and to locate the pivot connection of the carrier arm with the operating lever only slightly below a line through the pivot point of the operating lever and parallel to the elongation of the arm.
  • This supplies the necessary arrangement so that the over-the-center point is associated with a position of the operating lever in which the latter forms only a relatively small angle with the carrier arm. Simultaneously, a relatively large compensating movement of the carrier arm is obtained.
  • the present arrangement also provides a simple arrangement for obtaining a partial loading position. This is achieved by locating the pivot point 52 approximately in or'c'ontiguously adjacent a line parallel to the carrier arm and passing through the center of its arcuate path. A great difference in the lifting of the rear and of the frontmost upper rollers is obtained (i.e. the rearmost portion of the carrier passes through a greater movement or distance). It is to be understood, however, that the pivot point 50 of the carrier arm must not be located below the pivot axis of the point 14 of the lever 18.
  • the S-shaped spring 72 insures that the forward most roller 38 maintain contact with the associated roller 44 to hold the yarn. By its pressing against the pivot point 52 the spring 72 urges the carrier arm always into closed position.
  • the jointly movable leaf springs 62 with pins 64 provide a very simple and effective locking means.
  • Apparatus for mounting the top roller carriers of a drawing mechanism for a spinning machine comprismg a fixed support housing,
  • an operating lever pivoted at one end to said housing, a carrier arm having one end mounted with said housing and having a plurality of top rollers arranged along its length,
  • said linking means comprises an arcuate lever secured at one end to said second pivot point and at the other end to said housing.
  • pivot means at said second point comprising a pin, and including resilient means adapted to engage said pin on its upward movement and bias said carrier arm into its 8 operating position.
  • said resilient means comprises an S-shape leaf spring secured to said support housing.
  • said locking means comprises a spring having a lateral pin adapted to ride within a hole in said carrier arm, a hole in said support housing, said hole being arranged in alignment in the open non-operating position and said pin being adapted to enter and seat in said hole.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Preliminary Treatment Of Fibers (AREA)
US00121719A 1970-03-12 1971-03-08 Apparatus for mounting carrier arms in spinning machines Expired - Lifetime US3740798A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702011641 DE2011641C (de) 1970-03-12 Oberwalzen-Trag- und Belastungsarm für Spinnereimaschinen-Streckwerke

Publications (1)

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US3740798A true US3740798A (en) 1973-06-26

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US00121719A Expired - Lifetime US3740798A (en) 1970-03-12 1971-03-08 Apparatus for mounting carrier arms in spinning machines

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US (1) US3740798A (,)
ES (1) ES196845Y (,)
GB (1) GB1336222A (,)
RO (1) RO61663A (,)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120297748A1 (en) * 2010-02-12 2012-11-29 Maschinenfabrik Rieter Ag Drawing Frame for a Spinning Machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120297748A1 (en) * 2010-02-12 2012-11-29 Maschinenfabrik Rieter Ag Drawing Frame for a Spinning Machine
US8671657B2 (en) * 2010-02-12 2014-03-18 Maschinenfabrik Rieter Ag Drawing frame for a spinning machine

Also Published As

Publication number Publication date
ES196845U (es) 1975-03-16
GB1336222A (en) 1973-11-07
DE2011641A1 (de) 1971-09-30
RO61663A (,) 1977-04-15
ES196845Y (es) 1975-08-16

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