US2717426A - Improvements in or relating to drafting mechanisms for textile fibres - Google Patents

Improvements in or relating to drafting mechanisms for textile fibres Download PDF

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Publication number
US2717426A
US2717426A US32760352A US2717426A US 2717426 A US2717426 A US 2717426A US 32760352 A US32760352 A US 32760352A US 2717426 A US2717426 A US 2717426A
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US
United States
Prior art keywords
arm
pawl
weighting
catch
spring
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Expired - Lifetime
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English (en)
Inventor
Joseph Noguera
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.)
Casablancas High Draft Co Ltd
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Casablancas High Draft Co Ltd
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Application filed by Casablancas High Draft Co Ltd filed Critical Casablancas High Draft Co Ltd
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Publication of US2717426A publication Critical patent/US2717426A/en
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    • 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

  • This invention relates to drafting mechanisms for textile fibres, of the kind employing a number of drafting systems arranged side by side and each composed of consecutive pairs of rollers, the top rollers of adjoining drafting systems being carried and weighted from the centre by an arm which incorporates weighting means and is tion clear of the mechanism, two hands must be used, one
  • a main object of the present invention is to overcome the aforementioned disadvantages by the provision of catch means for the arm which can be engaged or disengaged merely by pressing down with one hand on the forward end of the arm itself.
  • Figure 1 is a cross-sectional elevation through a drafting mechanism and shows a weighting and carrying arm partially broken away to expose an embodiment of the catch means according to the invention, the bottom rollers of the mechanism being indicated diagrammatically in chain dotted lines and parts of the mechanism having no bearing on the invention being omitted, and
  • Figure 2 is a cross-sectional elevation through a portion of the drafting mechanism similar to that shown in Figure 1, part of the mechanism being broken away to illustrate an alternative embodiment of the invention.
  • both embodiments of the invention are illustrated in their application to a roller weighting and carrying arm having spaced side plates 1 and a cover portion 1a which extends between the upper and end edges of the plates.
  • the arm is mounted, in the usual manner, above the central necks 2 of the top rollers of roller pairs 3, 4 and 5 of adjoining drafting systems in a drafting mechanism, and is pivoted at the rear. between upstanding bracket plates 6 clamped on a bar 7 fixed at the rear of the mechanism.
  • the roller necks 2 are attached to the arm by means of a saddle assembly which is incorporated partially within the arm between the side plates 1.
  • This saddle assembly includes a front weighting saddle 8 to which is secured the neck 2 of the top rollers of the front roller pairs 3 of adjoining drafting systems.
  • the saddle 8 is extended rearwardly to provide an elongated lever 8a having a downwardly directed hook portion at the rear end for engaging a pivot pin 9 carried between the arm plates 1 a little behind the rear drafting rollers 5 and substantially parallel to the axes thereof.
  • the rearward extension 8a of the front saddle lies within an open slot formed longitudinally in the upper part of a second saddle 10 which engages the top roller necks 2 betwe en the middle and rear roller pairs 4 and 5 respectively of the adjoining systems.
  • the side edges of the aforesaid slot in the saddle 10 are formed with-upwardly extending projections 10a at or near the centre and a roller 11 is rotatably mounted between these projections so as to lie above and clear of the front saddle lever extension 8a.
  • One end of a lever 12 is arranged to bear downwardly on the periphcry of the roller 11 as shown, the lever being pivotally located intermediate its length by means of a pivot'pin 13 secured between the arm side walls 1 and engaging in a recess 12a in the upper edge of the lever.
  • the end of the lever 12 remote from the roller 11 is arranged to bear on coil springs 14 the opposite ends of which bear on the upper surface of the front saddle 8.
  • each spring 14 will press downwardly on the front saddle 8 to weight the top front rollers and also downwardly on the rear saddle 16, through the intermediary of the lever 12, to weight the middle and rear top rollers.
  • the catch means illustrated in Figure 1' for holding down the arm in the weighting position, includes a catchmember 15 which is mounted to pivot on a pin 16 secured between the bracket plates 6.
  • the catch member 15 is influenced by a spring 17 whereby a tail part 154 at the lower end of the catch member is normally held in abutting relationship with a fixed stop 18 which is also secured between the bracket plates 6. In this position, the upper part 15b of the catch member 15 extends upwardly and lies between the arm side plates 1 when the latter is in its lowered or operative position as illustrated.
  • a stepped portion is formed at the upper end 1511 of the catch member, on the side thereof towards the front of the weighting arm, the influence of the spring 17 being such that it normally tends to rotate the catch member in an anti-clockwise direction as viewed in Figure 1 of the drawings, this movement being prevented by the fixed stop 18 as aforesaid.
  • a dependent pawl 18c is mounted to pivot on a pin 19 secured between the arm plates 1.
  • the lower end of this pawl is hooked at 18a for engagement with the catch member 15 beneath the pivotal axis of the latter.
  • the hooked end 18a of the pawl is provided with an upwardly directed flat engaging edge face which is arranged to abut a corresponding downwardly directed flat edge face of the catch member 15 as shown.
  • the pawl 18c may conveniently be constructed in three layers 'of material and, at the upper end, part of the middle layer is cutaway for the reception of a lever 20 which is mounted to pivot on the same pin 19 as the pawl.
  • One end of this lever 20a is arranged to abut the underside of an extension 18b on the pawl which extension lies on the side of the pawl pivot which is nearer the forward end of the arm and remote from the catch member 15.
  • the other end 20b of the lever is arranged for coeoperation with the stepped portion 150 on the catch member 15 in a manner which will be later described.
  • the pawl is influenced by a spring 21 which tends to move the pawl hooked portion 18a into engagement with the catch member 15, i. e.
  • the lever 20 is influenced by a further spring .22 which is stronger than the pawl spring 21 and tends to rotate the lever in such a direction that the lever end 20a, by hearing on the pawl extension 13b, tends to press the pawl hooked portion 18a in a direction away from the catch member 15.
  • the purpose of the catch means as described is, as aforesaid, to hold the weighting arm down during operation of the drafting mechanism and thereby permit the weighting means, i, e. the springs 14, to apply the requisite pressure to the top rollers through the saddle assembly.
  • the weighting pressure applied to the top rollers by the springs 14 is, of course, much more powerful than the pressure exerted by any of the springs 17 and 21 or 22 which are applied to the various members of the catch means.
  • the catch means In order to understand the operation of the catch means as described, it will be convenient first to consider the arm in a raised position to which it can be brought, when the catch means are released, by lifting the front end of the arm and turning the latter about its rear pivot. In this position of the arm, the catch member 15 will be held in position for engagement against its stop 18 under the influence of the spring 17, and the pawl 180 will be held in a disengaged or pre-engaging position under the influence of the lever spring 22.
  • the modified catch means is applied to a lever arm which is of the same type as that illustrated in Figure 1.
  • This alternative catch means includes a catch member in the form of two similar circular plates 23. These plates are mounted to rotate on a common pivot pin 24 secured between the bracket plates 6 so as to lie just below the arm towards the rear end of the latter.
  • the plates 23 are joined by a ring of axially extending pins 25 which are slightly inset from the plate circumferences and are influenced by a spring 26 which is mounted on a bar 27 between the bracket plates 6.
  • a dependent pawl 28 Positioned above the plate assembly is a dependent pawl 28 which is mounted near its upper end on a pivot pin 29. This pin 29 is secured between the arm side plates 1 and close to the under surface of the cover portion 1a. The lower depending end of the pawl 28 is hooked at 23a for engagement with one of the pins 25.
  • the pawl 28 is centered by a spring 30 which is attached to the under surface of the arm cover portion 1a and has depending arms which bear on opposite side edges of the pawl. The result of this spring influence is that, when not engaging any other part of the device, the pawl is always urged into a dependent position in which it extends substantially perpendicularly with respect to the top cover portion of the arm.
  • the spring 26 operates on the pins 25 in such manner as to ensure that, in the absence of any other influence, one of the pins of the assembly is always in a predetermined uppermost engaging position which lies slightly forward, towards the front end of the arm, in relation to a straight line joining the centres of the pawl and plate pivots.
  • This movement serves to rotate the plate assembly or catch member against the influence of the spring 26, in a clockwise direction as viewed in Figure 2, so that the pawl pivot, plate pivot and engaged pin are then substantially in a straight line.
  • the pawl and catch member are locked under the action of the roller weight: ing pressure and the plate spring 26 bears downwardly and outwardly on one of the pins as shown, this spring pressure tending to turn the plate assembly further round in the clockwise direction viewed as aforesaid.
  • the spring 26 tends to turn the plate assembly so that the next pin in succession after the engaged pin is brought into the pre-engaging uppermost position as previously defined.
  • the arm can readily be raised or lowered by an operator using only one hand, this being very convenient when other operations have to be performed simultaneously on the mechanism by the same operator.
  • a drafting mechanism for textile fibres comprising consecutive pairs ofdrafting rollers, a top arm pivotally mounted on a fixture at the rear of the mechanism, means incorporated in said top arm for carrying the top rollers of said roller pairs, weighting springs acting between said arm and top rollers, cooperating pawl and catch members pivoted one on the arm and the other on said fixture for holding down said arm in its weighting position against the reaction of said weighting springs, spring means acting automatically to engage said pawl and catch members from disengaged positions when the arm is lowered from a raised position and depressed slightly beyond said working position against said weighting spring reaction, and further spring means, rendered operative by transmission of said weighting spring reaction through the pawl and catch members when the latter are engaged, for automatically returning said pawl and catch members to disengaged positions when the arm is depressed from the working position and then raised about its pivot.
  • a drafting mechanism for textile fibres comprising consecutive pairs of drafting rollers, a top arm pivotally mounted on a fixture at the rear of the mechanism, means incorporated in said top arm for carrying the top rollers of said roller pairs, weighting springs acting between said arm and top rollers, a spring influenced pawl depending from a pivot on said arm, a spring influenced trip lever ,1
  • inter-engageable members for holding the arm in its operative position when the members are engaged, automatically operating means operatively associated with said members causing said mem bers to interengage when the arm is moved from its inoperative position through its operative position, said members having cooperating parts held in locking engagement by the effect of the roller weighting pressure of the arm when the arm returns to its operative position, and automatically operating means operatively associated with said members effective for causing the disengagement of said members when the effect of the pressure of the arm on said parts of said members is removed by a subsequent moving of the arm through its operative position so that the arm is free to be moved to its inoperative position.
  • elastic operating means causing said membersto interengage when the arm is moved from its inoperative position through'its operative position, said members having cooperating parts held in frictional locking engagement by the effect of the roller weighting pressure of the arm when the arm returns to its operative position, and elastic means causing the disengagement of said members when the arm is subsequently moved through its operative position to'remove the effect'of the roller weighting pres-; sure of the arm onthe cooperating parts of said mern bers'so that the arm is free to'be moved to its inoperative po'sition,'*said elastic disengaging means being held 'inop-. erative by the frictional engagement of said parts of said members.
  • a drafting mechanism as claimed in claim 3 wherein the catch member is pivotally mounted intermediate its length and has an upper end which extends towards the arm for contacting the lever and a downwardly directed flat edge face below the pivot for engaging the pawl.
  • a drafting mechanism as claimed in claim 9 wherein the lower dependent end of the pawl is booked and provided with a flat upwardly directed edge face for engaging the said edge face of the catch member.
  • a drafting mechanism as claimed in claim 10 wherein the lever is mounted on the same pivot as the pawl and has a forward end which is urged by the lever spring influence, into engagement with an extension on the pawl and a rear end which is shaped to abut the upper end of the catch member, when the arm is depressed with the pawl and the catch member disengaged.
  • a mechanism is claimed in claim 11 wherein the pawl and catch member are arranged so that on initial engagement the respective flat edge faces are not in full abutting relationship but are moved into such relationship by relative rotation due to the re-assertion of said weighting pressure.

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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)
US32760352 1952-01-30 1952-12-23 Improvements in or relating to drafting mechanisms for textile fibres Expired - Lifetime US2717426A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2547/52A GB726905A (en) 1952-01-30 1952-01-30 Improvements in or relating to drafting mechanisms for textile fibres

Publications (1)

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US2717426A true US2717426A (en) 1955-09-13

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Application Number Title Priority Date Filing Date
US32760352 Expired - Lifetime US2717426A (en) 1952-01-30 1952-12-23 Improvements in or relating to drafting mechanisms for textile fibres

Country Status (4)

Country Link
US (1) US2717426A (fr)
CH (1) CH311159A (fr)
FR (1) FR1075270A (fr)
GB (1) GB726905A (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2758340A (en) * 1955-02-14 1956-08-14 Saco Lowell Shops Drafting mechanism
US2811751A (en) * 1955-04-14 1957-11-05 Spinnerei Karl Marx Veb Drawing frame for a spinning machine
US2884664A (en) * 1955-06-29 1959-05-05 Estirajes Balmes S A Mechanism for applying pressure to the drafting rollers of spinning and other textile preparatory machines
US2920356A (en) * 1955-04-29 1960-01-12 Skf Kugellagerfabriken Gmbh Schrott
US2943363A (en) * 1954-04-10 1960-07-05 Erwin Dausch Drawing mechanisms for spinning machines
US3015860A (en) * 1957-11-05 1962-01-09 Wilhelm Stahlecker G M B H Load arm for pressure rollers of draw frames
US3341902A (en) * 1964-06-29 1967-09-19 Om Ltd Device for pressing top roller of textile machine
CN110387606A (zh) * 2014-11-13 2019-10-29 村田机械株式会社 牵伸装置以及纺织单元

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1101240B (de) * 1955-06-27 1961-03-02 Goffredo Fusaroli UEbertotpunktgesperre zum Verriegeln eines Oberwalzen-Trag- und Belastungs-armes an Spinnereimaschinenstreckwerken
DE1027570B (de) * 1956-01-04 1958-04-03 Skf Kugellagerfabriken Gmbh Verriegelungsvorrichtung fuer einen Oberwalzen-Trag- und Belastungsarm an Streckwerken fuer Spinnereimaschinen
DE1073358B (de) * 1957-03-15 1960-01-14 SKF Kugellagerfabriken Gesellschaft mit beschränkter Haftung, Schweinfurt Verriegelungsvorrichtung für einen Oberwalzen-Trag- und Belastungsarm für Spinnereimaschinen-Streckwerke
DE1056016B (de) * 1957-10-24 1959-04-23 Skf Kugellagerfabriken Gmbh Verriegelung fuer einen hochschwenkbaren Oberwalzen-Trag- und -Belastungsarm an Spinnereimaschinen-Streckwerken
DE1086600B (de) * 1958-11-22 1960-08-04 Skf Kugellagerfabriken Gmbh Selbsttaetige Verriegelungsvorrichtung fuer einen hochklappbar in einer ortsfesten Stuetze aufgenommenen Oberwalzen-Trag- und Belastungsarm fuer Spinnereimaschinen-Streckwerke

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE505388A (fr) * 1950-09-23
US1396122A (en) * 1921-05-28 1921-11-08 George O Lipe Drawing-roll mechanism for spinning-frames
US2143996A (en) * 1937-03-26 1939-01-17 Whitin Machine Works Drafting mechanism
US2353338A (en) * 1941-03-29 1944-07-11 Joh Jacob Rieter & Cie Ag Draw frame
US2508964A (en) * 1947-03-19 1950-05-23 Rieter Joh Jacob & Cie Ag Naegeli
US2675587A (en) * 1949-09-23 1954-04-20 Ver Kugellagerfabriken Ag Device for supporting and weighting the top rolls of drawing mechanisms

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1396122A (en) * 1921-05-28 1921-11-08 George O Lipe Drawing-roll mechanism for spinning-frames
US2143996A (en) * 1937-03-26 1939-01-17 Whitin Machine Works Drafting mechanism
US2353338A (en) * 1941-03-29 1944-07-11 Joh Jacob Rieter & Cie Ag Draw frame
US2508964A (en) * 1947-03-19 1950-05-23 Rieter Joh Jacob & Cie Ag Naegeli
US2675587A (en) * 1949-09-23 1954-04-20 Ver Kugellagerfabriken Ag Device for supporting and weighting the top rolls of drawing mechanisms
BE505388A (fr) * 1950-09-23

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2943363A (en) * 1954-04-10 1960-07-05 Erwin Dausch Drawing mechanisms for spinning machines
US2758340A (en) * 1955-02-14 1956-08-14 Saco Lowell Shops Drafting mechanism
US2811751A (en) * 1955-04-14 1957-11-05 Spinnerei Karl Marx Veb Drawing frame for a spinning machine
US2920356A (en) * 1955-04-29 1960-01-12 Skf Kugellagerfabriken Gmbh Schrott
US2884664A (en) * 1955-06-29 1959-05-05 Estirajes Balmes S A Mechanism for applying pressure to the drafting rollers of spinning and other textile preparatory machines
US3015860A (en) * 1957-11-05 1962-01-09 Wilhelm Stahlecker G M B H Load arm for pressure rollers of draw frames
US3341902A (en) * 1964-06-29 1967-09-19 Om Ltd Device for pressing top roller of textile machine
CN110387606A (zh) * 2014-11-13 2019-10-29 村田机械株式会社 牵伸装置以及纺织单元
CN110387606B (zh) * 2014-11-13 2021-10-26 村田机械株式会社 牵伸装置以及纺织单元

Also Published As

Publication number Publication date
GB726905A (en) 1955-03-23
FR1075270A (fr) 1954-10-14
CH311159A (de) 1955-11-30

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