US3806677A - Detector mechanism for broken strands of yarn - Google Patents

Detector mechanism for broken strands of yarn Download PDF

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Publication number
US3806677A
US3806677A US00323777A US32377773A US3806677A US 3806677 A US3806677 A US 3806677A US 00323777 A US00323777 A US 00323777A US 32377773 A US32377773 A US 32377773A US 3806677 A US3806677 A US 3806677A
Authority
US
United States
Prior art keywords
fly wire
stop motion
yarn
contact member
fly
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
Application number
US00323777A
Other languages
English (en)
Inventor
J Deniega
E Schussel
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.)
Stop Motion Devices Corp
IRO Inc
Original Assignee
Stop Motion Devices Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Stop Motion Devices Corp filed Critical Stop Motion Devices Corp
Priority to US00323777A priority Critical patent/US3806677A/en
Priority to GB2906473A priority patent/GB1397180A/en
Priority to IT25933/73A priority patent/IT990732B/it
Priority to CA175,409A priority patent/CA962470A/en
Priority to DE19732336963 priority patent/DE2336963C3/de
Priority to FR7326669A priority patent/FR2214299A5/fr
Priority to ES417458A priority patent/ES417458A1/es
Priority to JP48090101A priority patent/JPS5231982B2/ja
Application granted granted Critical
Publication of US3806677A publication Critical patent/US3806677A/en
Assigned to IRO, Inc. reassignment IRO, Inc. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: VANGUARD SUPREME MACHINE CORPORATION A NC CORP.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
    • B65H63/02—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material
    • B65H63/024—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials
    • B65H63/028—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • ABSTRACT I A stop motion for detecting the interruption of yarn AS51811: p'm Devices Corporation! travel therethrough comprising a pivotally mounted fly Plalnvlew, N.Y.
  • Conventional stop motions of this type usually comprise a fly wire terminating at its free end in a yarn guide and mounted at its other end for pivotal movement.
  • the fly wire is biased for pivotal movement into a position in which it is operative to close a switch but is restrained from such pivotal movement by the yarn passing through its yarn guide. Accordingly, upon breakage or running out of yarn, the fly wire assumes its biased position causing the closing of a switch which is operative to interrupt the knitting machine drive.
  • An example of such conventional stop motion is shown in U. S. Pat. No. 2,733,308, assigned to the assignee hereof.
  • the fly wire biasing means may comprise a tension or torsion spring whereby the torque transmitted to the fly wire is at a maximum when the latter is restrained by the traveling yarn, thus imparting to such yarn more tension than desirable.
  • the torque acting on the fly wire gradually decreases as the fly wire pivotally moves into position wherein it is operative to close the switch, resulting in a decreased torque at such closing and an accompanying less reliable switch contact.
  • the switch closing in response to the pivotal movement of the fly wire usually occurs when the fly wire reaches a predetermined position, normally fixed. This limits the flexibility of the stop motion and may render its use less efficient in situations where it is desirable for the stop motion switch to be closed within a shorter period of time than it normally takes for the fly wire to reach its predetermined switch closing position.
  • the present invention therefore constitutes an improved stop motion which is void of deficiencies pointed out above.
  • the fly wire is'secured at one end thereof to a pin mounted for rotation within the housing whereby the fly wire is pivotable with respect to the housing.
  • the pivot pin also spring being fixed. Accordingly, the spring force is transmitted by means of the tape loop to the cam and the pin, biasing the latter for pivotal movement.
  • the fly wire, cam, tape and spring are assembled within the stop motion housing so that when the fly wire is in its normal operating position, i.e., the position in which it is restrained by the yarn passing through its guide, the point of engagement of the tape and the cam is at a minimal distance from the pivot pin whereby the torque transmitted by the spring to the pivot pin is at a minimum.
  • the force imparted by the fly wire to the travelling yarn is at a minimum.
  • restraint of the fly wire is removed allowing the cam to rotate under action of the tape whose point of contact with the cam moves gradually moredistantly from the pivot pin, whereby to transmit a progressively increasing torque to the cam and the fly wire.
  • the unrestrained fly wire and cam acquire gradually increasing pivotal momentum in response to such progressively increasing torque applied thereto.
  • Such pivotal movement of the cam results in a firm wiping engagement thereof with a flexible metallic tongue fixed to the housing, such tongue and cam collectively defining the stop motion switch and such firm wiping engagement therebetween assuring superior electrical contact.
  • the metallic tongue which forms one of the elements of the stop motion switch is adjustably movable to enable an earlier or later contact with the cam as may be desired.
  • the improved stop motion construction in accordance with the invention imparts minimum tension to the yarn during normal operation, and provides gradually increasing torque to the cam and fly wire, upon breakage of yarn, to provide firm wiping engagement of the cam with the metallic tongue to insure superior switch closing contact.
  • FIG. 1 is an elevational perspective view of the stop motion in accordance with the invention
  • FIG. 2 is a sectional view taken along line 22 of FIG. 1;
  • FIG. 3 is a section taken along line 3-3 of FIG. 2;
  • FIG. 4 is a right side view of the stop motion, when activated by yarn breakage
  • FIG. 5a is a perspective view, on an enlarged scale, of the stop motion cam
  • FIG. 5b is an elevational view of the cam with the tape loop secured thereto;
  • FIG. 50 is a sectional view taken along line c-c of FIG. 5b, on a further enlarged scale;
  • FIG. 5d is a view similar to FIG. 50, but showing the cam position upon activation of the stop motion.
  • FIG. 6 is a view taken along line 6-6 of FIG. 2.
  • the stop motion device 10 in accordance with the present invention comprises a housing 12 made of a suitable plastic or other insulating material, having spaced side walls 14 and 16, front wall 18, top wall 20 and bottom wall 22.
  • An L-shaped metallic bracket 24 comprises leg 26 which defines a rear wall closure for the housing and leg 28 provided with conventional means for securing stop motion 10 to the knitting machine.
  • Housing 12 includes an upper forwardly projecting portion 30, an intermediate forwardly projecting portion 32 and a lower forwardly projecting portion 34, all three being provided, respectively with aligned apertured yarn guides 36, 38 and 40, respectively.
  • a pivot pin 42 is mounted for rotation within housing 12, being suitably supported for rotation in side walls 14 and 16 from which said pin projects outwardly to a slight extent.
  • a U-shaped fly wire 44 comprising legs 46 and 48 terminates at one end with yarn guide 50 and at the other end in a pair of ears 52, 54 adapted to be removably secured to the opposite ends of pivot pin 42 which project outwardly of side walls 14 and 16, respectively, a bushing 55 being provided between ear 52 and side wall 14 where it is slightly recessed.
  • the projecting ends of pivot pin 42 are appropriately slotted as at 57 (FIG. for receiving cars 54 and 52 whereby the fly wire and pin move in unison.
  • fly wire 44 In the normal operating position of the stop motion, fly wire 44 is in a position wherein its yarn guide 50 is held in alignment with yarn guides 36, 38 and 40 by the yarn Y passing therethrough.
  • Pivot pin- 42 mounts a cam 56 between end walls 14 and 16.
  • cam 56 comprises opposite flanges 58 and 60, eccentric with respect to pin 42, and reduced diameter portion 62 extending between the flanges which may be hollow as shown.
  • Such reduced diameter portion 62 is truncated as at 64-64 in a plane spaced from the axis of pivot pin 42 a small distance identified as X in FIG. 50.
  • Opposite ends 66, 68 of an endless tape are fixedly secured to portion 62 whereby to define a tape loop 70 which is wrapped about cam portion 62 from which it then depends.
  • Bracket 26 also mounts a metallic strip 80 comprising an inwardly extending part 82 from which is struck out an angularly depending tongue 84.
  • Metallic strip 80 is appropriately insulated from bracket 24 by means of insulating spacers 86 and is secured to bracket 80 by bolt 88 and nut 90. Stud 92 of bolt 88 extends outwardly of the housing and defines a suitable terminal in electrical conductivity with tongue 84.
  • a lamp 96 is mounted in the bottom wall 22 of the housing and is connected at one terminal thereof, to L-shaped contact member 98 secured between rack 78 and metallic bracket 24, which is grounded.
  • a conductor strip 100 is secured within the housing having its upper portion 102 in physical engagement with cam 54 and its lower portion 104 in engagement with the other terminal of lamp 96. From an electrical standpoint, therefore, cam 54 which is made of conductive material is in series with lamp 96 which is grounded.
  • the torque transmitted by the spring, via tape 72, to'pivot pin 42,'cam 56 and fly wire 44, is at a minimum since the moment arm of the spring force, which is defined by the distance between the pivot pin axis and the point of contact of the tape with the cam is of the magnitude X, as best shown in FIG. 50.
  • the force transmitted by the fly wire to the yarn passing therethrough is at a minimum.
  • tongue 84 is spaced from the cam 56, and particularly flange 60 thereof with which it is aligned as best shown in FIG. 3.
  • fly wire 44 is released from the restraint imposed thereon by the yarn, enabling the spring to impart rotational movement to pivot pin 42, cam 56, and fly wire 44 in a clockwise direction viewing FIGS. 2 and 50, whereby these assume the positions shown in FIGS. 4 and 5d. As such rotation progresses, it will be. apparent that due to the cam effect, the moment arm of the spring force gradually increases from the minimal value X to the value X, thus imparting gradually increasing torque to the pivot pin and cam.
  • Cam 56 and tongue 84 collectively define the stop motion switch which is thus seen to be firmly closed when fly wire 44 is released from its restraint due to the breakage or running out of yarn Y.
  • the closing of such switch completes a circuit from ground to terminal 92 which is connected in conventional manner to a power pack operative to instantaneously interrupt the knitting machine drive. Simultaneously, the closing of such switch by completing said circuit to the power pack, energizes lamp 96 to provide a visual indication of the stop motion which has been activated.
  • the housing 12 is provided with opposed recessed facings 114, 116 defining shoulders 118 and 120 which define stops for legs 48 and 46 of the fly wire, respectively, when such fly wire is released from its restraint.
  • the utilization of the cam action for the fly wire biasing simultaneously achieves two highly desirable goals not existing in conventional stop motions of this type.
  • the fly wire rotates with increasing momentum to insure a prompter and firmer switch closing for interrupting the knitting machine drive.
  • the fly wires apply maximum tension on the yarn during normal operation and, when released from restraint, the fly wire moves into switch closing position with reduced momentum.
  • the movement of the fly wire with increased momentum when released from its restraint is particularly desirable where the stop motion is equipped with a yarn catcher 106 best shown in FIG. 1, which comprises a wire conformation terminating in a narrow gap 108 intended to retain the free end of the broken yarn in order to facilitate rethreading of the device.
  • Such yarn catcher is far more likely to retain the yarn where the released fly wire moves with increasing momentum upon yarn breakage, toenable it to carry with it the yarn to be captured by the yarn catcher, as
  • strip portion 82 can be moved upwardly or downwardly to adjust the spacing between tongue 84 and cam 56.
  • the point of contact between flange 60 and tongue 84 can be preselected to occur sooner or later, as may be de' sired, after yarn breakage.
  • metallic strip which includes portion 82 and struck out tongue 84 are naturally resilient to permit the adjustability thereof under the action of set screw 110.
  • spring 74 is secured to detent 76 which forms part of a toothed rack member 78 best shown in FIGS. 2 and 6.
  • a toothed wheel 112 rotatable externally by means of knob 115 enables vertical adjustment of rack 78 in order to adjust the tension of spring 74 as may be desired.
  • a stop motion for detecting the interruption of yarn travel therethrough comprising,
  • a fly wire having yarn guide means, mounted on said housing for pivotal movement relative thereto about an axis of rotation and adapted to be restrained in a first position in which the guide means thereof is in aligned relation with said housing guide means by the uninterrupted yarn travel through said aligned guide means,
  • a cam member eccentrically mounted about said axis of rotation, said cam member being operatively related to said biasing means and to said fly wire whereby said biasing means applies minimal torque to said fly wire when it is in said first position thereof and progressively increasing torque thereto when said fly wire is freed from said restraint.
  • biasing means comprise tape means secured at one end thereof to said cam member and at the other end thereof to tension spring means whereby the spring force is transmitted to said cam member through said tape means.
  • switch means comprise an electrical contact member mounted on said housing and a surface portion of said cam member which wipingly engages said contact member as said fly wire pivotally moves away from said first position thereof when freed from said restraint.
  • adjustable means operatively related to said electrical contact member and adapted to vary the position of said electrical contact member for selectively controlling the point of engagement thereof with said cam member surface portion.
  • said switch means comprise a first electrical contact member mounted on said housing and a second electrical contact member movable in unison with said fly wire whereby said second contact member moves into engagement with said first contact member as said fly wire pivotally moves away from said first position thereof when freed from said restraint.
  • adjustable means operatively related to said first electrical contact member and adapted to vary the position of said first contact member for selectively controlling the point of engagement thereof with said second contact member.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Knitting Machines (AREA)
  • Filamentary Materials, Packages, And Safety Devices Therefor (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
US00323777A 1973-01-15 1973-01-15 Detector mechanism for broken strands of yarn Expired - Lifetime US3806677A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US00323777A US3806677A (en) 1973-01-15 1973-01-15 Detector mechanism for broken strands of yarn
GB2906473A GB1397180A (en) 1973-01-15 1973-06-19 Stop motion
IT25933/73A IT990732B (it) 1973-01-15 1973-06-27 Meccanismo di arresto
CA175,409A CA962470A (en) 1973-01-15 1973-06-28 Stop motion
DE19732336963 DE2336963C3 (de) 1973-01-15 1973-07-20 Fadenwächter
FR7326669A FR2214299A5 (fr) 1973-01-15 1973-07-20
ES417458A ES417458A1 (es) 1973-01-15 1973-08-01 Un mecanismo de parada para detectar la interrupcion del hilo que se desplaza a traves del mismo.
JP48090101A JPS5231982B2 (fr) 1973-01-15 1973-08-13

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00323777A US3806677A (en) 1973-01-15 1973-01-15 Detector mechanism for broken strands of yarn

Publications (1)

Publication Number Publication Date
US3806677A true US3806677A (en) 1974-04-23

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ID=23260681

Family Applications (1)

Application Number Title Priority Date Filing Date
US00323777A Expired - Lifetime US3806677A (en) 1973-01-15 1973-01-15 Detector mechanism for broken strands of yarn

Country Status (7)

Country Link
US (1) US3806677A (fr)
JP (1) JPS5231982B2 (fr)
CA (1) CA962470A (fr)
ES (1) ES417458A1 (fr)
FR (1) FR2214299A5 (fr)
GB (1) GB1397180A (fr)
IT (1) IT990732B (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3867592A (en) * 1972-12-14 1975-02-18 Antonio Sala Quellos Stop motion switch for controlling thread tension in a textile machine
US3873043A (en) * 1973-01-17 1975-03-25 Benninger Ag Maschf Yarn guide- and monitoring apparatus for a bobbin creel
US3888095A (en) * 1973-03-16 1975-06-10 Morris Philip Stop motion assembly and method
US4027121A (en) * 1975-10-10 1977-05-31 Cutler-Hammer, Inc. Yarn trapper for yarn detector switch
US4137731A (en) * 1976-02-11 1979-02-06 Aktiebolaget Iro Thread supply device for textile machine having common thread control and tension sensing element
US4331008A (en) * 1979-09-11 1982-05-25 Gebrueder Frei Gmbh & Co. Thread control in textile machines
US4551591A (en) * 1984-06-18 1985-11-05 Jones Robert E Stop motion switch
WO2001004401A1 (fr) * 1999-07-12 2001-01-18 Memminger-Iro Gmbh Fournisseur de fil a element d'arret a poids allege

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56121513U (fr) * 1980-02-12 1981-09-16
GB2231341A (en) * 1989-05-09 1990-11-14 Donald Stinson Yarn stop-motion device
GB2383802A (en) * 2002-01-03 2003-07-09 New House Textiles Ltd Yarn break detector

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1835732A (en) * 1930-11-03 1931-12-08 Wachsman Jacob Stop mechanism for knitting machines
US2599595A (en) * 1950-06-22 1952-06-10 Wachsman Jacob Stop motion mechanism for knitting machines
US2733308A (en) * 1953-09-08 1956-01-31 Vossen
US3202779A (en) * 1962-06-15 1965-08-24 Bell & Howell Co Sensing switch

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1835732A (en) * 1930-11-03 1931-12-08 Wachsman Jacob Stop mechanism for knitting machines
US2599595A (en) * 1950-06-22 1952-06-10 Wachsman Jacob Stop motion mechanism for knitting machines
US2733308A (en) * 1953-09-08 1956-01-31 Vossen
US3202779A (en) * 1962-06-15 1965-08-24 Bell & Howell Co Sensing switch

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3867592A (en) * 1972-12-14 1975-02-18 Antonio Sala Quellos Stop motion switch for controlling thread tension in a textile machine
US3873043A (en) * 1973-01-17 1975-03-25 Benninger Ag Maschf Yarn guide- and monitoring apparatus for a bobbin creel
US3888095A (en) * 1973-03-16 1975-06-10 Morris Philip Stop motion assembly and method
US4027121A (en) * 1975-10-10 1977-05-31 Cutler-Hammer, Inc. Yarn trapper for yarn detector switch
US4137731A (en) * 1976-02-11 1979-02-06 Aktiebolaget Iro Thread supply device for textile machine having common thread control and tension sensing element
US4331008A (en) * 1979-09-11 1982-05-25 Gebrueder Frei Gmbh & Co. Thread control in textile machines
US4551591A (en) * 1984-06-18 1985-11-05 Jones Robert E Stop motion switch
WO2001004401A1 (fr) * 1999-07-12 2001-01-18 Memminger-Iro Gmbh Fournisseur de fil a element d'arret a poids allege
US6637693B1 (en) 1999-07-12 2003-10-28 Memminger-Iro Gmbh Yarn feed device having a weight-relieving stop element
CN1304668C (zh) * 1999-07-12 2007-03-14 梅明格-Iro股份有限公司 具有去重量负荷的停止器的纱线供给装置

Also Published As

Publication number Publication date
ES417458A1 (es) 1976-03-16
JPS5231982B2 (fr) 1977-08-18
FR2214299A5 (fr) 1974-08-09
GB1397180A (en) 1975-06-11
IT990732B (it) 1975-07-10
CA962470A (en) 1975-02-11
DE2336963B2 (de) 1976-09-23
JPS49101662A (fr) 1974-09-26
DE2336963A1 (de) 1974-07-25

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Legal Events

Date Code Title Description
AS Assignment

Owner name: IRO, INC., A CORP.OF CT

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:VANGUARD SUPREME MACHINE CORPORATION A NC CORP.;REEL/FRAME:004055/0526

Effective date: 19820621

Owner name: IRO, INC., CONNECTICUT

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:VANGUARD SUPREME MACHINE CORPORATION A NC CORP.;REEL/FRAME:004055/0526

Effective date: 19820621