US3498339A - Fail safe warp stop circuit - Google Patents

Fail safe warp stop circuit Download PDF

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Publication number
US3498339A
US3498339A US756451A US3498339DA US3498339A US 3498339 A US3498339 A US 3498339A US 756451 A US756451 A US 756451A US 3498339D A US3498339D A US 3498339DA US 3498339 A US3498339 A US 3498339A
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US
United States
Prior art keywords
solenoid
scr
loom
circuit
gate
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
US756451A
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English (en)
Inventor
Charles H Davis
Warren A Barber
Daniel H Lambros
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.)
SSMC Inc
Original Assignee
Singer Co
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 Singer Co filed Critical Singer Co
Application granted granted Critical
Publication of US3498339A publication Critical patent/US3498339A/en
Anticipated expiration legal-status Critical
Assigned to SSMC INC., A CORP. OF DE reassignment SSMC INC., A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SINGER COMPANY, THE
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/18—Automatic stop motions
    • D03D51/20—Warp stop motions
    • D03D51/28—Warp stop motions electrical

Definitions

  • the circuit is energized from an A.C. source through a switch actuated by moving the loom shipper handle to normal run position.
  • a first controlled rectifier (SCR) supplied by A.C. is triggered into conduction to energize the solenoid responsively to the switch closure.
  • a second SCR supplied by DC. and normally non-conducting is triggered into latched conduction by actuation of the conventional warp-break drop wires and shunts current away from the gate of the first SCR which stops conducting at first zero anode current to deenergize the solenoid and shut down the loom in conventional manner.
  • the second SCR distinguishes between actual war-p breakage and normal transient waving or jiggling of the drop wires by a time delay in the gate circuit. When once fired, the second SCR remains in latched conduction due to the D.C. anode voltage until the shipper is knocked to stop position, which resets the entire circuit.
  • the solenoid is normally energized and is deenergized responsively to warp breakage or power failure to actuate the stop motion.
  • Normal energization is maintained through a first SCR operated on A.C. anode voltage.
  • a second SCR, operatedon D.C. anode voltage provides when triggered by a falling drop wire, a shunt path for diverting the gate current away from the first SCR causing it to block and to de- 3,498,339 Patented Mar. 3, 1970 DESCRIPTION OF THE INVENTION
  • the single figure of the drawing is a wiring diagram of the circuit of this invention applied to a conventional mechanical stop motion indicated schematically.
  • a conventional shipper handle 10 which is shown in off position, may be moved in the direct-ion of the arrow shown to start the loom for normal running.
  • a loom shaft 11 provided with a cam 12 in conventional manner operates a knockoff mechanism indicated schematically as 13 when the high point of cam 12 engages a push rod .14 to actuate rod 15 which returns the shipper handle to 01$ position and shuts down the loom.
  • the function of the knockoif mechanism 13, which is conventional, is to provide engagement or disengagement of the rods 14 and 15 responsively to the actuation of the armature 16 of solenoid -17 through mechanical link 18.
  • a switch 19 actuated by shipper handle 10 through link 20 closes responsively to initial movement of shipper handle 10 to start position to supply voltage to lines 21-22 from a suitable source 8-8 of low A.C. voltage.
  • a first controlled rectifier (SCR) 23 has its anode 24 and cathode 25 connected in series with the solenoid 17 across lines 21-22.
  • a conventional free wheeling diode 26 is connected in shunt with the solenoid 17 and provides a path for solenoid current caused by magnetic field collapse during the alternate half cycles whenSCR 23 cannot conduct.
  • a diode 27 and a filter capacitor 28 supply a source of D.C. voltage maintained across the capacitor 28.
  • a second SCR 29 has its anode 30 and cathode 31 connected in series with resistance 32 across the D.C. voltage as shown.
  • a bias stabilizing resistance 33 is connected in shunt with cathode 25 and gate 34 of the first SCR 25.
  • a shunt path across cathode 25 and gate 34 is also formed by the series connection of resistance 35, anode 30 and cathode 31 of SCR 29.
  • a resistance 36 and capacitor 37 are each connected across the cathode 31 and gate 38 of the second SCR 29.
  • the switch 39 closes automatically in response to breakage of a warp thread but can be made operative to close in response to any loom malfunction to signal a loom shut down.
  • the switch will take the form of drop wire contacts which are in common use on looms to detect warp thread breakage.
  • closure of switch 39 provides a path through diode 40 and resistance 41 for flow of unidirectional current into the gate 38 of SCR 29.
  • a resistance 42 shunts the series combination of diode 40, resistance 41 and capacitor 37.
  • the shipper handle Under normal operation, the shipper handle when moved in the start direction indicated by the arrow, actuates a linkage whereby the drive clutch connects the loom to the drive motor in a conventional manner.
  • Initial movement of the shipper handle 10 will close switch 19 applying A.C. voltage from a source S-S to lines 21-22.
  • SCR 23 Providing drop wire switch 39 is open, SCR 23 will conduct every half cycle applying half-wave current through the solenoid 17, which will actuate armature 16 and through link 18 will disable the stop motion mechanism 13 as described above. Armature 16 will be held in this position as long as SCR 23 remains conductive assisted by the current averaging effect of the diode 26.
  • SCR 23 is turned on every half cycle by positive triggering current supplied to the gate 34 by the diode 27 through resistances 32 and 35. This represents the normal running condition for the loom.
  • switch 39 will close, applying current rectified by diode 40 through resistance 41 to the gate of SCR 29 (which was hitherto off) and turning it on. It will be noted that any short or momentary duration of closure of switch 39 caused by normal Waving or jiggling of drop wires will not fire SCR 29. This is so because the current flow into the gate 38 is controlled by the rate at which capacitor 37 can be charged through the resistance 41. Thus values of resistance 41 and capacitor 37 can be chosen so that switch 39 must remain closed a predetermined minimum time before SCR 29 can be turned on and this provides means for discriminating between a real thread break and normal jiggling of the drop wires. However, when once fired, the SCR 29 latches into conduction because of the D.C. anode current supplied by diode 27 and remains so until the shipper handle and linkage disengages the loom from its driving source.
  • any failure resulting in deenergizing the solenoid 17 will shut down the loom. This includes failure of the solenoid winding itself as Well as failure in the power supply S-S. This function is inherent and does not require any additional circuitry.
  • a circuit for controlling the energization of the solenoid from an A.C. voltage source comprising:
  • (d) means deriving a D.C. voltage from said A.C. voltage source
  • (f) means connecting the second rectifier to provide a low impedance path shunting the gate and cathode of the first rectifier when the second rectifier is conducting
  • firing delay means (11) includes:
  • a circuit according to claim 1 wherein the means ((1) deriving a D.C. voltage from said A.C voltage source includes:

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US756451A 1968-08-30 1968-08-30 Fail safe warp stop circuit Expired - Lifetime US3498339A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US75645168A 1968-08-30 1968-08-30

Publications (1)

Publication Number Publication Date
US3498339A true US3498339A (en) 1970-03-03

Family

ID=25043548

Family Applications (1)

Application Number Title Priority Date Filing Date
US756451A Expired - Lifetime US3498339A (en) 1968-08-30 1968-08-30 Fail safe warp stop circuit

Country Status (7)

Country Link
US (1) US3498339A (enrdf_load_stackoverflow)
JP (1) JPS4930031B1 (enrdf_load_stackoverflow)
BE (1) BE737627A (enrdf_load_stackoverflow)
CH (1) CH495044A (enrdf_load_stackoverflow)
DE (1) DE1940134A1 (enrdf_load_stackoverflow)
FR (1) FR2017094A1 (enrdf_load_stackoverflow)
GB (1) GB1209728A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3625243A (en) * 1970-02-13 1971-12-07 Singer Co Time cycle warp-stop motion control for weaving looms
US3929171A (en) * 1974-11-27 1975-12-30 Rockwell International Corp Fail safe stop motion for looms
US4100942A (en) * 1975-09-30 1978-07-18 Ruti Machinery Works Ltd. Drive, control and monitoring device for looms
FR2464321A1 (fr) * 1979-09-03 1981-03-06 Saurer Ag Adolph Casse-chaine electrique de machines a tisser

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52124200U (enrdf_load_stackoverflow) * 1976-03-17 1977-09-21
DE3240114A1 (de) * 1981-12-09 1983-06-16 Black & Decker, Inc., 19711 Newark, Del. Steuerschaltung fuer ein elektromagnetisch betaetigtes kraftwerkzeug, insbesondere eintreibgeraet

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2436022A (en) * 1945-05-21 1948-02-17 Crompton & Knowles Loom Works Electric loom controlling means
US2531944A (en) * 1946-02-04 1950-11-28 Arthur G B Metcalf Textile machine
US2981295A (en) * 1958-04-24 1961-04-25 Crompton & Knowles Corp Stopping mechanism for loom
US3373773A (en) * 1965-07-12 1968-03-19 George H. Balentine Jr. Loom

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2436022A (en) * 1945-05-21 1948-02-17 Crompton & Knowles Loom Works Electric loom controlling means
US2531944A (en) * 1946-02-04 1950-11-28 Arthur G B Metcalf Textile machine
US2981295A (en) * 1958-04-24 1961-04-25 Crompton & Knowles Corp Stopping mechanism for loom
US3373773A (en) * 1965-07-12 1968-03-19 George H. Balentine Jr. Loom

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3625243A (en) * 1970-02-13 1971-12-07 Singer Co Time cycle warp-stop motion control for weaving looms
US3929171A (en) * 1974-11-27 1975-12-30 Rockwell International Corp Fail safe stop motion for looms
US4100942A (en) * 1975-09-30 1978-07-18 Ruti Machinery Works Ltd. Drive, control and monitoring device for looms
FR2464321A1 (fr) * 1979-09-03 1981-03-06 Saurer Ag Adolph Casse-chaine electrique de machines a tisser

Also Published As

Publication number Publication date
BE737627A (enrdf_load_stackoverflow) 1970-02-02
FR2017094A1 (enrdf_load_stackoverflow) 1970-05-15
GB1209728A (en) 1970-10-21
DE1940134A1 (de) 1970-08-27
JPS4930031B1 (enrdf_load_stackoverflow) 1974-08-09
CH495044A (de) 1970-08-15

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Legal Events

Date Code Title Description
AS Assignment

Owner name: SSMC INC., A CORP. OF DE, CONNECTICUT

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SINGER COMPANY, THE;REEL/FRAME:005041/0077

Effective date: 19881202