US3650128A - Stop motion control device for knitting machines - Google Patents

Stop motion control device for knitting machines Download PDF

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Publication number
US3650128A
US3650128A US850613A US3650128DA US3650128A US 3650128 A US3650128 A US 3650128A US 850613 A US850613 A US 850613A US 3650128D A US3650128D A US 3650128DA US 3650128 A US3650128 A US 3650128A
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United States
Prior art keywords
crank member
yarn
piston
tension
crank
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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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US850613A
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English (en)
Inventor
Josef Ferda
Josef Kotacka
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.)
Elitex Zavody Textilniho
Original Assignee
Elitex Zavody Textilniho
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Publication date
Application filed by Elitex Zavody Textilniho filed Critical Elitex Zavody Textilniho
Application granted granted Critical
Publication of US3650128A publication Critical patent/US3650128A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B35/00—Details of, or auxiliary devices incorporated in, knitting machines, not otherwise provided for
    • D04B35/10—Indicating, warning, or safety devices, e.g. stop motions

Definitions

  • the present invention relates to apparatus for feeding yam to a knitting machine and in particular to apparatus for controlling the operation of said machine in dependence upon the tension on said yarn.
  • yarn is fed to the thread guides in an automatic knitting machine from individual spools mounted on a frame or creel.
  • control devices responsive to yarn tension and continuity.
  • One such device comprises a stationary arm carrying a forked yarn guide and a pair of movable arms 'one of which is adjustably rotatable while the other is a freely pivoted counterweighted arm.
  • the rotatable arm is spring mounted, and is adjustable to provide a fixed tension on the yarn as the yarn is fed to the stationary arm while the pivoted counterweighted arm is freely movable in response to the tension of the yarn.
  • Yarn is passed over each of the rotatable and pivotal arms serially as it is fed to the stationary arm from whence it is fed to the thread guides.
  • the rotatable arm and the pivoted counterweighted arm and the carrying sleeve within which the shafts are mounted are provided with cooperating electrical contact members.
  • the electrical contactmembers are connected to various machine control elements in a manner whereby movement of the pivoted counterweighted arm, either asva result of excessive or insufficient tension, or movement of the rotatable arm, as a result of yarn breakage, causes the knitting machine to stop operation.
  • movement of the pivoted counterweighted arm either asva result of excessive or insufficient tension, or movement of the rotatable arm, as a result of yarn breakage, causes the knitting machine to stop operation.
  • a pivoted yarn guide fixed to a unidirectional spring loaded over-the-center crank.
  • the crank is adjustably loaded so as to have a predetermined resiliency to the tension of the moving yarn and to be responsive instantly to excessive tension of the yarn as it passes over the guide.
  • the crank being thereafter adapted to close contacts with the machine control means whereby operation of the machine maybe stopped.
  • FIG. 1 is a front elevation of a longitudinal section through the device of the present invention in operation
  • FIG. 2 is a side elevation of the longitudinal section of FIG. 1 taken along the lines A A of FIG. 1;
  • FIG. 3 is a view similar to FIG. 1 showing the device of the present invention operative in response to an excessively tensioned yarn;
  • FIG. 4 is an enlarged view of the electric contact portion of the present device
  • FIG. Si is a diagram of the electric circuit of the present device.
  • the present device comprises a rectangular box like body 1 having a hollow cavity 3 at its upper end, and a cover 2 which may be secured thereto in any conventional manner.
  • the body 1 is preferably formed of nonconductive material while the 'cover 2 is preferably formed of conductive or metallic material for reasons to be explained later.
  • Secured within the back wall of the body 1 and the cover 2 are coaxially opposed friction bearing members 4 and 5, respectively.
  • the bearing member 4 may be made of nylon or other similar plastic material which is nonconductive while the bearing 5 is made of conductive material. Both bearing 4 and 5 are force fit within recesses formed within the body and cover, respectively.
  • crank member 8 Located within the body cavity 3 is a crank member 8 having extending wing like arms 6 and 7 rotatably secured within the bearing members 4 and 5, respectively.
  • the crank member 8 is bifurcated in its central section to provide a forked shaped recess 9 through which is transversely mounted a wrist pin 10.
  • the wing like arm 7 extending through the lid 2 is elongated and is provided with a transverse hole in which is inserted a nonnally horizontally extending arm 11 of a yarn hook 12.
  • the arm I2 is maintained in fixed position within the elongated crank arm 7 by a conventional screw member and the yarn hook 12 is smoothly formed and it is adapted to hold the yarn as the yarn is fed to the knitting machine.
  • a rod 14 is freely secured to the wrist pin 10.
  • the rod I4 is likewise freely secured at its other end to a second wrist pin 15 which is transversely secured within the end of a piston member 16 mounted so as to be freely movable in a bore '40 formed within the lower solid portion of the body member 1.
  • the piston 16 is provided with an axial recess, 17 within which one end of a tension spring 18 is fixed.
  • the bore 40 is threaded at its outer end and is provided with a correspondingly threaded knob 19 the face of which abuts against the lower end of the spring 18 thereby resiliently loading the piston 16.
  • the loading of the piston 16 (that is the action of the spring 18 on the piston 16) may be adjusted by turning the knob 19.
  • the device is arranged so that within predetermined limits of tension on the yarn I3 the arm 11 will extend horizontally from the body I and permit the thread 13 to be guided endlessly over the hook 12.
  • the wrist pin 10 In this disposed to each other about the wrist pin 10 and resiliently biased in one direction to abut against one of the interior walls of the cavity 3.
  • Contact 21 is provided with a resilient leaf spring 21a which extends over the contact 20 and is normally out of electrical contact therewith. Extending from contacts 20 and 21 are electrical leads 22 and 23, respectively.
  • the second outlet terminal of the transformer 24 is also grounded as for example to the knitting machine.
  • the first terminal of the transformer 24 is connected, in addition to the lamp 25, to a pair of switches 26 and 27, across which are connected a resistor 29 and the terminal C ofa multiple terminal solenoid relay 28.
  • the coil 30 of the solenoid relay 28 is connected at one end to the ground and at the other end between the resistor 29 and the cover 2.
  • the cover 2 acts as a separate and distinct ground or common contact, labeled X in thedrawings to which one ormore of the circuit components may be connected. It is' for this reason that cover 2 should be metallic or otherwise conductive. It will be appreciated that the body 1 maybe conductive while the cover 2 nonconductive if desired.
  • the remaining terminals A and B of the relay 28 are connected to various power line sources for motors etc.
  • a yarn 13 is withdrawn from a selected bobbin located on a creel (both of which are not shown) and suspended over the hook 12 which is horizontally disposed .in its normal operating position.
  • the yarn 13 as it moves, being pulled from the bobbin by operation ofthe knitting machine, exerts a force upon the hook l2 pivoting the arm 11 and the crank 8 in the direction of arrow S (FIG. 1).
  • the rate of turning of resiliently biased crank 8 is of course controlled by operation of the spring loaded piston 16 which as noted previously has been preset to a predetermined tension level by adjustment of knob 19.
  • the preadjustnient of thespring 18 provides a maximum force which can be exerted by the yarn 13 in the direction S upon the guiding arm 11. This maximum force is determined differently for each knitting machine, the yarn being processed and other similar well known operating factors. So long as the yarn 13 does not exert a force greaterthan the maximum force or tension of the spring l8 the yarn continuesto be guided over the hook 12 which remains in a substantially horizontal 'position, the crank 8 and piston rod 14 .moving between a dead center position and its normal operating position as shown in FIG. 1. Should, however, the force on the yarn exceed the maximum predetermined limit set by the spring 18 as seen by yar'n 13 in FIG.
  • crank 8 and rod 14 move beyond the dead center position and instantaneouslyreverse their angular disposition within the cavity 3. Thereupon the crank 8 abuts against the contact 1211 and completes the contact between the electrical terminals 20 and 21.
  • the arm 11 at which end the hook 12 is provided, pivots downwardly from a substantially horizontal position to acute angular position allowingthe yam'toifall from the hook 12. This pivoting'the arm "11, which permits the yarn to fall, prevents the breakage oft'he yarn dueto any increased tension on the yarn itself.
  • FIG. 5 the electrical operation of the device is seen.
  • the control device is set by closing both switches 26 and 27 thereby completing circuit between the transformer 24, the resistor 29 and the coil 30 of the relay 28.
  • the relay contacts 28 shift (to the right as seen in the FIG. 5) so that contact is made from the transformer 24 through switch 26 through contact C of the relay 28 thence through the resistor 29 and into the coil 30 thereby holding the coil 30 in its inward or right hand position.
  • the switch 27 may be released and left open, the solenoid relay 28 being fixed in contact position, In contact position relay contacts A AND B are operative to permit the knitting machine to operate. So long as the yarn 13 does not exceed its predetermined maximum tension, the circuit just described remainsstable.
  • the present invention provides a simple but effective and novel device for controlling the operation of a knitting machine in response to yarn tensionflt "will be observed that momentary fluctuations in yarn tensions do not effect a stoppage of the knitting machine, nor does excessive tension result in yarn breakage.-
  • The'device is highly adjust'able and clearly'operative in many applications and with a variety of knitting machines and 'yarn. Any number of modifi cations andchanges will be readily apparent to those skilled in the art and it is therefore intended that the present disclosure be taken solely as illustrative of the inventive concepts.
  • Apparatus for controlling the operation of a knitting machine in response to the tension of a yarn fed thereto comprising a hollow walled body, switch means mounted on one wall of said body, a unidirectional over-the-center crank "member having a pair of opposed axial extending arms 'pivotally'secured withinlsaid body to pivot about a fixed axis,
  • a piston located within an axial bore in a wall of said body ofi'set from said one wall and transverse to the pivot axis of said crank member, a rod pivotally connected at its ends to said crank member and said piston respectively, cooperating therewith to form an articulated connection between said crank member and said piston, a spring fixed to said piston within said bore to apply a predetermined force to said piston to normally bias said crank member in said second position, a yarn guide fixed to said crank member and extending outwardly of said body to receive a moving yarn, said guide being adapted to pivot said crank member in response to the tension on said yarn and to overcome the biasing of the crank member by said spring and piston, said crank member being moved to said first position in response to a predetermined level of tension exceeding the predetermined force of said spring and means operative upon engagement of said crank member with said switch to effect the stoppage of said knitting machine.
  • the apparatus according to claim 1 including a knob threaded in the piston bore adapted to. turning to selectively adjust the strength of the spring to thereby vary the biasing of the crank member.
  • the means operable to effect stoppage of the machine includes a self holding relay disconnected on operation of said electric contact, said relay having contacts forming a portion of the electric circuit of the knitting machine.
  • the apparatus according to claim 4 including means for preventing resetting of said relay until return of the crank member to its normally biased position.
  • the body is formed of at least two parts only one of which is conductive, which conductive part forms a portion of the electric circuit, at least one arm of the crank member being secured within said nonconductive part.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
US850613A 1968-08-16 1969-08-15 Stop motion control device for knitting machines Expired - Lifetime US3650128A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CS593568 1968-08-16

Publications (1)

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US3650128A true US3650128A (en) 1972-03-21

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ID=5405264

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Application Number Title Priority Date Filing Date
US850613A Expired - Lifetime US3650128A (en) 1968-08-16 1969-08-15 Stop motion control device for knitting machines

Country Status (5)

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US (1) US3650128A (de)
AT (1) AT315348B (de)
DE (1) DE1938673A1 (de)
FR (1) FR2015761A1 (de)
GB (1) GB1272077A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4872488A (en) * 1987-09-02 1989-10-10 Picanol N.V. Device for determining the position of a warp thread break
US4882916A (en) * 1989-03-02 1989-11-28 Jones Robert E Knitting machine stop motion activator
US5353610A (en) * 1992-07-28 1994-10-11 International Trading S.R.L. Device for controlling the feed of at least one yarn to a textile machine so as to compensate any pulling and excess tension exerted on the yarn

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2145220A (en) * 1983-08-18 1985-03-20 Bentley Eng Co Ltd Yarn fault detector installations

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1358483A (en) * 1918-08-09 1920-11-09 Wachsman Adolph Stop mechanism for knitting-machines
US1778097A (en) * 1929-12-05 1930-10-14 Wachsman Jacob Circuit closer for stop-mechanism of knitting machines and the like
GB390134A (en) * 1930-06-28 1933-03-30 Perssons Vaefoch Stickmaskin A Improvements in devices for stopping the operation of circular knitting machines in the case of thread breakage or jamming of thread
US1992860A (en) * 1933-06-29 1935-02-26 Crawford Mfg Company Stop motion for knitting machines
US2329618A (en) * 1941-05-08 1943-09-14 Tompkins Bros Co Knitting machine
US2329427A (en) * 1943-02-06 1943-09-14 Stop Motion Devices Corp Stop motion device
US2467952A (en) * 1949-04-19 Antonevich
US2654238A (en) * 1949-09-28 1953-10-06 T J Brooks Autos Ltd Electrical stop motion for knitting machines
GB742533A (en) * 1952-07-08 1955-12-30 Alfred Planck Improvements in or relating to electric stop motion devices for knitting or hosiery machines
US3321755A (en) * 1963-06-14 1967-05-23 Triplite Ltd Stop means for textile machines
GB1090648A (en) * 1965-03-06 1967-11-15 Jachonic Ltd Improvements in or relating to textile machines
US3379037A (en) * 1966-03-15 1968-04-23 Crawford Stop Motion Co Inc Multiple yarn stop motion assembly
US3390553A (en) * 1966-04-25 1968-07-02 Singer Co Yarn slub catchers

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2467952A (en) * 1949-04-19 Antonevich
US1358483A (en) * 1918-08-09 1920-11-09 Wachsman Adolph Stop mechanism for knitting-machines
US1778097A (en) * 1929-12-05 1930-10-14 Wachsman Jacob Circuit closer for stop-mechanism of knitting machines and the like
GB390134A (en) * 1930-06-28 1933-03-30 Perssons Vaefoch Stickmaskin A Improvements in devices for stopping the operation of circular knitting machines in the case of thread breakage or jamming of thread
US1992860A (en) * 1933-06-29 1935-02-26 Crawford Mfg Company Stop motion for knitting machines
US2329618A (en) * 1941-05-08 1943-09-14 Tompkins Bros Co Knitting machine
US2329427A (en) * 1943-02-06 1943-09-14 Stop Motion Devices Corp Stop motion device
US2654238A (en) * 1949-09-28 1953-10-06 T J Brooks Autos Ltd Electrical stop motion for knitting machines
GB742533A (en) * 1952-07-08 1955-12-30 Alfred Planck Improvements in or relating to electric stop motion devices for knitting or hosiery machines
US3321755A (en) * 1963-06-14 1967-05-23 Triplite Ltd Stop means for textile machines
GB1090648A (en) * 1965-03-06 1967-11-15 Jachonic Ltd Improvements in or relating to textile machines
US3379037A (en) * 1966-03-15 1968-04-23 Crawford Stop Motion Co Inc Multiple yarn stop motion assembly
US3390553A (en) * 1966-04-25 1968-07-02 Singer Co Yarn slub catchers

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4872488A (en) * 1987-09-02 1989-10-10 Picanol N.V. Device for determining the position of a warp thread break
US4882916A (en) * 1989-03-02 1989-11-28 Jones Robert E Knitting machine stop motion activator
US5353610A (en) * 1992-07-28 1994-10-11 International Trading S.R.L. Device for controlling the feed of at least one yarn to a textile machine so as to compensate any pulling and excess tension exerted on the yarn

Also Published As

Publication number Publication date
AT315348B (de) 1974-05-27
FR2015761A1 (de) 1970-04-30
DE1938673A1 (de) 1970-02-19
GB1272077A (en) 1972-04-26

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