US3597940A - Yarn tension control means for warp-knitting machine - Google Patents

Yarn tension control means for warp-knitting machine Download PDF

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Publication number
US3597940A
US3597940A US835628A US3597940DA US3597940A US 3597940 A US3597940 A US 3597940A US 835628 A US835628 A US 835628A US 3597940D A US3597940D A US 3597940DA US 3597940 A US3597940 A US 3597940A
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United States
Prior art keywords
yarn
tension
spring
supporting member
lever
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Expired - Lifetime
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US835628A
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English (en)
Inventor
Robert H Dupuis
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Crompton and Knowles Corp
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Crompton and Knowles Corp
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B27/00—Details of, or auxiliary devices incorporated in, warp knitting machines, restricted to machines of this kind
    • D04B27/10—Devices for supplying, feeding, or guiding threads to needles
    • D04B27/14—Thread tensioning rod arrangements

Definitions

  • ABSTRACT A compensator for the knitting of yarn in warp knitting machines in which one or more springs are anchored at one of their ends to a movable support and in turn support a tension roll at their other ends.
  • the tension roll is yieldable against the bias of the springs in response to increase in tension of yarn trained around the roll.
  • Actuating means are operated in timed relation with the knitting needles to move the support in a manner which moves the tension roll in a direction for releasing yarn to the knitting needles during peak yarn consumption and in a direction for taking up slack yarn during periods of little or no consumption, the relative positions of the springs and tension roll remaining the same with respect to the support so that the stress on the springs remains the same for a given yarn tension.
  • the invention relates to tension control in warp knitting machines and is directed particularly to means for compensating for the variability of knitting yarn consumption during each knitting cycle.
  • a row of knitting needles are reciprocated to form knitted stitches from yarns fed by yarn guides, one for each yarn.
  • the yarn guides are given a motion to wrap their respective yarns around individual needles. Due to the motion of the yarn guides and of the needles, a fluctuating demand for the yarn is created in each knitting cycle.
  • Yarn is supplied to the guides from supply beams which, from a practical standpoint, must be rotated at a substantially uniform speed throughout each knitting cycle. To compensate for the difference between yarn feed and yarn consumption, it is customary to employ a tension device over which the yarn is trained as it passes from the supply beam to the guides.
  • tension devices comprise a rail or roll so constructed as to yield under spring tension upon the pull of the yarns when the demand for yarn increases andto relax and still apply tension to the yarns when the demand eases.
  • An example of a tension device of this type is shown in U.S. Pat. No. 3,412,583 to R. H. I-Iaehnel.
  • Thecontrol means of the present invention compensates for nonuniformity of yarn consumption by releasing yarn to the knitting needles during peak consumption and taking up slack yarn during the portion of each knitting cycle where yarn is not consumed.
  • Positive means are employed to move a tension roll around which the yarn is trained. Although the tension roll operates against a spring means in response to yarn tension, the stress on the spring is not increased when the roll is moved to release yarn to the knitting needles. This is possible because the tension roll is supported by the spring means which is in turn supported by a movable support means. Mechanical means are employed to move the support means in timed relation to the knitting needles.
  • FIG. 1 is a side elevation of the invention as applied to a warp knitting machine, parts being in section;
  • FIG. 2 is a fragmentary rear elevation looking in the direction of arrow 2 in FIG. 1;
  • FIG. 3 is a fragmentary section on line 3-3 of FIG. 1, showing a portion of the drive assembly
  • FIG. 4 is a diagrammatic view illustrating a modification of the invention.
  • the preferred yarn compensator and tensioning device of the present invention is generally indicated at 10.
  • This unit is applied to a knitting machine generally indicated at 12 and comprising a row of knitting needles l4 and a guide bar 16 which supports a plurality of guides 18.
  • a knitting yarn supply source generally indicated at 20 supplies a sheet of yarns, indicated at y, to the guides 18.
  • the guides wrap their respective yarns around corresponding knitting needles 14in a well-known manner.
  • Supply source 20 includes a yarn beam 22 which is driven in a well-known manner as, for example, a variable speed transmitter indicated at 24 to supply yarn at a constant rate.
  • Compensator 10 comprises a shaft 26 pass supported at its ends in bearings 28 which are supported by the knitting machine framework indicated at 30.
  • a series of spaced leaf springs 32' are anchored to shaft 26 by fasteners 34 at points located between bearings 28.
  • the number of springs can be varied if different yarn tensions are desired particularly if a different type of yarn is used.
  • the upper ends of the leaf springs 32 support an elongated tension member 36 which has a rounded surface 38 around which the yarns are trained as they pass from the beam 22 to the yarn guides 18.
  • a pair of upright bars 40 are fixed to shaft 26 near the ends of the shaft.
  • a bumber bar 42 extends through the upper ends of bars 40 and is fixed thereto by screws 44. Bar 42 is situated just behind and engaging springs 32 for a purpose to be described.
  • the needles are mounted in a needle bar 46 which is actuated by a connecting rod 47 extending from an eccentric rod 48, see FIG. 3, which is reciprocated by an eccentric 50.
  • This eccentric is mounted on a shaft 52 mounted in a housing 54 and which is driven by a motor M.
  • a second eccentric 56 is also mounted on shaft 52 and drives an eccentric rod 58.
  • a connecting rod 60 extends from rod 58 and is connected to a first connecting arm 62.
  • Other operating units may also be driven from shaft 52.
  • Rod 62 is pivotally connected to one arm 63 a bellcrank lever 64 which is pivoted at 65 to frame 30.
  • the upper end of a vertically disposed second connecting arm 66 is pivotally connected at 67 to the other arm 68 of bellcrank lever 64.
  • the lower end of connecting arm 66 is pivotally connected by a pin 69 to a lever 70 which is also pivoted on frame 30.
  • a horizontally disposed third connecting arm 72 is pivotally connected to lever 70 and rod 66 by pin 69.
  • Arm 72 is connected to a universal joint 74 which is connected to the upper portion of an arm 76 which is an integral portion of one of the bearings 28.
  • a similar series of connectors and levers extending from another eccentric on shaft 6 is connected to the other bearing 28.
  • eccentric 50 reciprocates needle bar 46, as well-known in the knitting art.
  • Eccentric 56 reciprocates connecting arm 62 left and right as shown in FIG. 1 so that it oscillates lever 64 around pivot 65.
  • Arm 62 is shown in its left-hand position as viewed in FIG. 1.
  • lever 64 is rocked counterclockwise so that pivot 67 moves upwardly and lifts connector 66.
  • connector 66 is thus lifted, lever 70 is rocked counterclockwise and connecting arm 72 is pulled to the left in FIG. I.
  • Bearing 28 together with shaft 26 is rocked counterclockwise by the leftward pull of connecting arm 72.
  • tension member 36 When the knitting needles are in the full line or front position, tension member 36 is in its right-hand position as shown in FIG. 1. At this point in the knitting cycle, yarn is not being consumed by the knitting needles but as the needles move toward the left in FIG. 1, they begin to draw yarn to form the next knitting loop. It is at this point when there is the greatest demand for yarn.
  • the timing of eccentric 56 together with the particular arrangements or rods and levers and connectors which rock shaft 26, produce a motion for tension member 36 which releases yarn to the knitting needles at an ideal rate. Since the support for the springs (shaft 26) is moved positively, the stress on the springs is not increased. This means that any fluctuation in yarn tension will cause the yarn to react against a spring tension which is as soft" when member 36 is in either of its positions.
  • FIG. 4 there is shown a modification of the invention indicated generally at 78.
  • This modification comprises a tension member 80 supported on a compression spring 82 which is in turn supported on one end of a lever 84.
  • a guide rod 86 is attached to the tension member and extends freely through the spring 82 and lever 84.
  • Lever 84 is pivoted at 85 to the frame 30 and has a follower 88 attached to its other end.
  • Follower 88 rides in a groove generally indicated at 90 in a cam 92.
  • This cam is rotated by a drive shaft 94 which may be driven from shaft 52 or from the motor M in timed relation with the knitting needles.
  • Cam 92 has a low portion 91 and a high portion 93 and is designed to operate lever 84 so as to impart a vertical motion to tension member 80 which releases and takes up yarn Y in a manner similar to tension member 36.
  • An arm 96 extends from lever 84 and engages a projection 98 on tension member 80. Arm 96 is comparable to bumber 42 in that it positively assists member 80 to move downwardly when the right-hand end of lever 84, as shown in FIG. 4, is moved downwardly.
  • yarn Y in FIG. 4 is let off from beam 22 at a constant rate and fed over tension member to the knitting needles in the direction of arrow 100.
  • follower 88 moves from the low portion 91 to the high portion 93 of cam 92.
  • Lever 84 is rocked clockwise, thereby lowering tension member 80 as assisted by member 96. Lowering of tension member 80 allows y: m to be released to the knitting needles.
  • cam 92 moves lever 84 counterclockwise to raise tension member 80 to take up slack yarn which tends to develop from the constant feed of beam 22.
  • the stress on the spring 82 remains the same for a given yarn tension when the tension member is in either of its extreme positions.
  • a compensator and tensioning device for variability of yarn consumption comprising:
  • actuating means operated in timed relation with said knitting needles for moving said supporting member to one of said positions for releasing yarn to said knitting needles when yarn is being consumed by said needles and to the other of said positions for taking up slack yarn when yarn is not being consumed by said knitting needles.
  • a second lever pivotally mounted on a fixed pivot and being pivotally connected to the other end of said second connecting arm at a point spaced from the fixed pivot of said second lever;
  • a third connecting arm one end ofwhich is pivotally connected to said second pivoted lever at said spaced point, and the other end of which is operatively connected to said supporting member.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
US835628A 1969-06-23 1969-06-23 Yarn tension control means for warp-knitting machine Expired - Lifetime US3597940A (en)

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US83562869A 1969-06-23 1969-06-23

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US835628A Expired - Lifetime US3597940A (en) 1969-06-23 1969-06-23 Yarn tension control means for warp-knitting machine

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US (1) US3597940A (de)
AT (1) AT337872B (de)
BE (1) BE752204A (de)
CH (1) CH514711A (de)
DE (1) DE2028779A1 (de)
FR (1) FR2047063B1 (de)
GB (1) GB1316838A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070057108A1 (en) * 2005-09-13 2007-03-15 Brown Maurice H Adjustment mechanism for a wire tensioning apparatus
CN102965835A (zh) * 2011-08-30 2013-03-13 卡尔迈尔纺织机械制造有限公司 经编机
CN120273099A (zh) * 2025-06-10 2025-07-08 福建佶龙机械科技股份有限公司 一种经编机的可调牵拉机构

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2308430A (en) * 1941-07-12 1943-01-12 Fnf Ltd Warp tension bar for textile machines
US2442796A (en) * 1946-10-10 1948-06-08 Vanity Fair Mills Inc Thread tensioning means
US2637184A (en) * 1951-08-14 1953-05-05 Alfred Hofmann & Co Warp tension bar for knitting machines
US2667773A (en) * 1951-08-14 1954-02-02 Alfred Hofmann & Co Warp tensioning bar for knitting machines
GB718097A (en) * 1951-04-25 1954-11-10 Fnf Ltd Improvements relating to yarn controlling apparatus in warp knitting machines
US2699051A (en) * 1951-05-01 1955-01-11 Kidde Mfg Co Inc Warp tension control device for knitting machines
US2811027A (en) * 1954-12-24 1957-10-29 Textile Machine Works Yarn tensioning means for knitting machines
US2844950A (en) * 1956-03-13 1958-07-29 Textile Machine Works Yarn tensioning means for knitting machines
US2913888A (en) * 1957-07-22 1959-11-24 Roy C Amidon Warp knitting method, machine and needle therefor

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2308430A (en) * 1941-07-12 1943-01-12 Fnf Ltd Warp tension bar for textile machines
US2442796A (en) * 1946-10-10 1948-06-08 Vanity Fair Mills Inc Thread tensioning means
GB718097A (en) * 1951-04-25 1954-11-10 Fnf Ltd Improvements relating to yarn controlling apparatus in warp knitting machines
US2699051A (en) * 1951-05-01 1955-01-11 Kidde Mfg Co Inc Warp tension control device for knitting machines
US2637184A (en) * 1951-08-14 1953-05-05 Alfred Hofmann & Co Warp tension bar for knitting machines
US2667773A (en) * 1951-08-14 1954-02-02 Alfred Hofmann & Co Warp tensioning bar for knitting machines
US2811027A (en) * 1954-12-24 1957-10-29 Textile Machine Works Yarn tensioning means for knitting machines
US2844950A (en) * 1956-03-13 1958-07-29 Textile Machine Works Yarn tensioning means for knitting machines
US2913888A (en) * 1957-07-22 1959-11-24 Roy C Amidon Warp knitting method, machine and needle therefor

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070057108A1 (en) * 2005-09-13 2007-03-15 Brown Maurice H Adjustment mechanism for a wire tensioning apparatus
US7467759B2 (en) * 2005-09-13 2008-12-23 Brown Maurice H Adjustment mechanism for a wire tensioning apparatus
CN102965835A (zh) * 2011-08-30 2013-03-13 卡尔迈尔纺织机械制造有限公司 经编机
CN102965835B (zh) * 2011-08-30 2014-10-15 卡尔迈尔纺织机械制造有限公司 经编机
CN120273099A (zh) * 2025-06-10 2025-07-08 福建佶龙机械科技股份有限公司 一种经编机的可调牵拉机构

Also Published As

Publication number Publication date
CH514711A (de) 1971-10-31
GB1316838A (en) 1973-05-16
AT337872B (de) 1977-07-25
ATA547870A (de) 1976-11-15
DE2028779A1 (de) 1971-01-07
BE752204A (fr) 1970-12-01
FR2047063B1 (de) 1973-01-12
FR2047063A1 (de) 1971-03-12

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