US3907006A - Apparatus for indicating the breakage of warp threads in a loom - Google Patents

Apparatus for indicating the breakage of warp threads in a loom Download PDF

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Publication number
US3907006A
US3907006A US488794A US48879474A US3907006A US 3907006 A US3907006 A US 3907006A US 488794 A US488794 A US 488794A US 48879474 A US48879474 A US 48879474A US 3907006 A US3907006 A US 3907006A
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US
United States
Prior art keywords
bar
section
loom
support bar
cross
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
US488794A
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English (en)
Inventor
Erwin Pfarrwaller
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.)
Sulzer AG
Original Assignee
Sulzer AG
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 Sulzer AG filed Critical Sulzer AG
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Publication of US3907006A publication Critical patent/US3907006A/en
Anticipated expiration legal-status Critical
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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

  • This invention relates to warp I stop motions for looms, i.e. to apparatus for detecting the breakage of warp threads in a loom and for arresting the operation of the loom in consequence thereof.
  • the invention relates more particularly to the contact bars in such apparatus by means of which a signal may be produced in the event of a warp thread breakage.
  • apparatus for detecting the breakage of warp threads in a loom comprises an electrically conductive first or carrier bar of U-shaped cross-section, an electrically insulating support bar which is housed partly within the carrier bar and which has one longitudinal edge located beyond the free ends of the legs from the bight of the U, and an electrically conductive finder bar mounted on that longitudinal edge of the support bar, no part of the exposed surface of the finder bar being as close to the bight of the U as the free ends of the legs of the U.
  • the thickness of the finder bar is not dictated by the need to provide adequate insulation between the carrier bar and the finder bar. Instead, it is only necessary to provide a sufficient vertical spacing between the carrier bar and the finder bar to insure adequate insulation.
  • the thicknesses of the finder bar and the support bar, measured in the direction normal to their length and to the legs of the U cross-section of the carrier bar, may be substantially equal.
  • the contact bar system Because of the freedom in selecting the thickness of the support and finder bars, it is possible to design the contact bar system to be thin enough to be used with standard drop wires, even if the legs of the carrier bar are made comparatively thick.
  • the support bar and finder bar may be mounted for movement together in the direction of their length.
  • the contact bar system includes power means arranged to reciprocate the support bar and the finder bar. This makes it easier to locate a broken warp yarn, since the fallen drop wire and those on either side of it will be reciprocated slightly.
  • FIG. 1 is a vertical sectional view through the bars of one form of apparatus according to the invention for indicating thebreakage of warp threads in a loom, the bars being shown in conjunction with a drop wire which is seen in fragmentary elevation; and
  • FIG. 2 is a fragmentary side elevation shown at a reduced scale of the bars of the embodiment of FIG. 1, in combination with a fragmentary schematic showing of a loom and of means to reciprocate the support and finder bars of FIG. 1.
  • metallic carrier bar 1 of U- shaped cross-section is adapted to extend across the width of a loom, and in use is fixed at its ends to the frame 10 of the loom, as indicated at 10 in FIG. 2.
  • a support bar 5 which is made of an electricallyinsulating material also extends across the width of the loom, with its lower part between the legs 7 of the cross-section of the carrier bar 1.
  • the support bar can be reciprocated transversely of the loom by an electric motor 1] driving through an eccentric or other suitable linkage, which may be of known type.
  • a clearance 8 is left between the inside surfaces 6 of the carrier bar 1 and the surfaces of the support bar 5 to allow reciprocation.
  • a metallic finder bar 3 which has teeth 2 along its top edge is fixed to the support bar 5 along the top of the latter.
  • a tongue and groove joint is formed between the support bar and the finder bar, the sides of the groove being indicated at 4.
  • the distance between the finder bar 3 and the carrier bar 1 is nowhere less than the distance d, which may for example be 5 mm.
  • Each of the warp yarns of the loom passes through an associated drop wire 13 which is engaged over or surrounds the carrier bar 1, the support bar 5 and the finder bar 3. Consequently, when a warp yarn breaks and the corresponding drop wire 13 has dropped into the chain-dotted position 13a of FIG. 1, the drop wire 13 touches the bar 3 at 21 and the bar 1 at 22, so that an electrical connection is made between the electrical leads 14 and 15. This connection may be employed to stop the loom.
  • the finder bar 3 When the finder bar 3 is reciprocated in the direction indicated by a double arrow 19, the drop wire 13 associated with the broken warp will have dropped into the space 23 between two teeth, and will be likewise reciprocated. Consequently, the drop wires which are adjacent to the dropped drop wire and which are hanging on undamaged warp yarns are reciprocated slightly so that the machine attendant can see the position of the broken yarn.
  • the support bar 5 has a thickness f no greater than the thickness of the finder bar 3, and so the overall thickness a of the carrier bar 1 can be small even though its legs 7 can have a relatively large thickness [2.
  • the bar 1 can therefore have relatively high bending strength, so that the contact bar system is of use for large cloth widths, e.g. of meters or more.
  • the relatively large vertical space d between the bars 1 and 3 insures minimal capacitive coupling between the bars 1 and 3; excessive coupling might lead to interference which could cause unnecessary stoppages of the machine when operating on an AC. supply, for example, a 60 Hz. supply. Also, there is no risk of a false electrical connection occurring between the bars 1 and 3 and causing unnecessary stoppages of the machine as might happen if part of the finder bar 3 extended between the legs of the carrier bar 1, and were to become covered with moist fluff.
  • Apparatus for indicating the breakage of a warp thread in a loom comprising an electrically conductive bar of U-shaped cross-section extending crosswise of the loom, an electrically insulative support bar extending parallel to and disposed partly within the U-shaped cross-section of said first-named bar, said support bar further extending exteriorly of said cross-section with one longitudinal edge of said support bar being outside said cross-section, and an electrically conductive bar affixed to the support bar along said one longitudinal edge and being in its entirety outside said cross-section.
  • Apparatus according to claim 1 wherein said lastnamed conductive bar is provided with teeth, said apparatus further including means to reciprocate the support bar and last-named conductive bar crosswise of the loom.
  • Apparatus according to claim 1 in which the support bar and last-named conductive bar have substantially the same thickness in directions transverse of their length and of the legs of said U-shaped crosssection.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US488794A 1973-07-24 1974-07-15 Apparatus for indicating the breakage of warp threads in a loom Expired - Lifetime US3907006A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1076373A CH567127A5 (nl) 1973-07-24 1973-07-24

Publications (1)

Publication Number Publication Date
US3907006A true US3907006A (en) 1975-09-23

Family

ID=4366575

Family Applications (1)

Application Number Title Priority Date Filing Date
US488794A Expired - Lifetime US3907006A (en) 1973-07-24 1974-07-15 Apparatus for indicating the breakage of warp threads in a loom

Country Status (17)

Country Link
US (1) US3907006A (nl)
JP (2) JPS5048258A (nl)
AT (1) AT328992B (nl)
BE (1) BE817843A (nl)
CH (1) CH567127A5 (nl)
CS (1) CS180019B2 (nl)
DE (1) DE2340714C3 (nl)
DK (1) DK137018B (nl)
ES (1) ES427785A1 (nl)
FR (1) FR2238786B1 (nl)
GB (1) GB1412930A (nl)
IE (1) IE39608B1 (nl)
IT (1) IT1015639B (nl)
LU (1) LU70590A1 (nl)
NL (1) NL7407429A (nl)
SE (1) SE413197B (nl)
SU (1) SU645602A3 (nl)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4321951A (en) * 1979-04-25 1982-03-30 Sulzer Brothers Ltd. Warp yarn stop motion
US5309951A (en) * 1991-06-13 1994-05-10 Grob & Co. Contact drop wire for an electric warp stop

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5432346U (nl) * 1977-08-03 1979-03-02
GB2050104A (en) * 1979-05-18 1980-12-31 Cons Group Screen-printing screen and methods of use and manufacture thereof
DE3146781C1 (de) * 1981-11-25 1983-03-31 Grob & Co AG, 8810 Horgen, Zürich Mechanischer Kettfadenwaechter
EP0187745A1 (de) * 1984-08-09 1986-07-23 GROB & CO. AKTIENGESELLSCHAFT Kontaktschienenanordnung für den Kettfadenwächter einer Textilmaschine
NL8600372A (nl) * 1986-02-14 1987-09-01 Picanol Nv Inrichting voor het bepalen van de plaats van een kettingbreuk bij weefmachines met kettingwachterlamellen.
NL8602410A (nl) * 1986-09-24 1988-04-18 Picanol Nv Werkwijze om het al dan niet aanwezig zijn van aan elkaar gehechte kettingdraden te bepalen en weefmachine die deze werkwijze toepast.
GB2223511B (en) * 1988-10-10 1992-08-26 Texipat S A Apparatus and method for automatically repairing broken warp threads in weaving machines or looms

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2160718A (en) * 1938-11-09 1939-05-30 Draper Corp Detector bar
US2556332A (en) * 1950-02-17 1951-06-12 Jr Ansel R Meadors Warp stop mechanism for looms
US3246091A (en) * 1962-07-11 1966-04-12 Grob & Co Ag Electric contact bar for thread stop motions
US3635258A (en) * 1970-07-02 1972-01-18 Deering Milliken Res Corp Stop motion drop wire

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH031657U (nl) * 1989-05-25 1991-01-09

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2160718A (en) * 1938-11-09 1939-05-30 Draper Corp Detector bar
US2556332A (en) * 1950-02-17 1951-06-12 Jr Ansel R Meadors Warp stop mechanism for looms
US3246091A (en) * 1962-07-11 1966-04-12 Grob & Co Ag Electric contact bar for thread stop motions
US3635258A (en) * 1970-07-02 1972-01-18 Deering Milliken Res Corp Stop motion drop wire

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4321951A (en) * 1979-04-25 1982-03-30 Sulzer Brothers Ltd. Warp yarn stop motion
US5309951A (en) * 1991-06-13 1994-05-10 Grob & Co. Contact drop wire for an electric warp stop

Also Published As

Publication number Publication date
SE413197B (sv) 1980-04-28
JPS5482153U (nl) 1979-06-11
FR2238786B1 (nl) 1977-10-07
SE7409518L (nl) 1975-01-27
BE817843A (fr) 1975-01-20
ES427785A1 (es) 1976-08-01
IT1015639B (it) 1977-05-20
DK276174A (nl) 1975-03-03
ATA704773A (de) 1975-06-15
JPS5048258A (nl) 1975-04-30
AT328992B (de) 1976-04-26
LU70590A1 (nl) 1974-11-28
FR2238786A1 (nl) 1975-02-21
DE2340714C3 (de) 1976-01-08
DK137018C (nl) 1978-06-05
DE2340714B2 (de) 1975-05-22
DE2340714A1 (de) 1975-02-13
DK137018B (da) 1978-01-02
CH567127A5 (nl) 1975-09-30
CS180019B2 (en) 1977-12-30
NL7407429A (nl) 1975-01-28
GB1412930A (en) 1975-11-05
IE39608L (en) 1975-01-24
SU645602A3 (ru) 1979-01-30
IE39608B1 (en) 1978-11-22

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