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US2986358A - Thread tension device for sewing machines - Google Patents

Thread tension device for sewing machines Download PDF

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Publication number
US2986358A
US2986358A US711302A US71130258A US2986358A US 2986358 A US2986358 A US 2986358A US 711302 A US711302 A US 711302A US 71130258 A US71130258 A US 71130258A US 2986358 A US2986358 A US 2986358A
Authority
US
United States
Prior art keywords
tension
disc
discs
arbor
thread
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
US711302A
Other languages
English (en)
Inventor
Ralph E Johnson
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.)
Singer Co
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
Priority to US711302A priority Critical patent/US2986358A/en
Priority to ES0246351A priority patent/ES246351A1/es
Priority to FR1213318D priority patent/FR1213318A/fr
Priority to GB1499/59A priority patent/GB853372A/en
Priority to CH6856559A priority patent/CH369348A/de
Application granted granted Critical
Publication of US2986358A publication Critical patent/US2986358A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B47/00—Needle-thread tensioning devices; Applications of tensometers

Definitions

  • the present invention relates to a thread tension device for sewing machines and more particularly to a tension -disc for use in such a device.
  • the primary object of the present invention is to provide a thread tension device for sewing machines which will produce a more uniform tension on the thread.
  • this object is obtained by the use of a novel tension disc.
  • Fig. 1 is a sectional view of a thread tension device embodying the present invention mounted upon a sewing machine.
  • Fig. 2 is a perspective view of a tension disc of the device illustrated in Fig. 1.
  • Fig. 3 is a sectional view of the tension disc of the device illustrated in Fig. 1.
  • the present invention is herein disclosed as embodied in the needle thread tension device forming the subject matter of my prior application Serial No. 692,323, filed October 25, 1957, now Patent No. 2,955,775.
  • This de-' vice includes a cylindrical arbor I mounted on the frame of the sewing machine, a fragmentary portion of which is illustrated at 2.
  • the inner end of the arbor 1 is provided with a longitudinally grooved enlarged diameter portion 3 about which is coiled one end of a check spring 4 and to which the one end of the check spring is anchored.
  • the enlarged diameter portion 3 defines a shoulder 5 against which abuts the innermost one of three identical tension discs 6 loosely mounted on the arbor 1.
  • the tension discs 6 are resiliently urged against each other in 'turn and against the shoulder 5 by the usual beehive spring "7 coiled about the arbor 1 and acting at its inner end on the outermost one of the tension discs 6 through an inner spring cover 8 and a guard plate 9.
  • the outer end of the spring 7 abuts against an anchor disc 10 having a diameter bar 11 seated in a slot 12 extending axially inwardly from the free end of the arbor 1 to hold the disc 10 against turning relatively to the arbor 1.
  • the disc 10 in turn abuts against an adjusting nut 13 threaded onto the free end of the arbor 1 and has a clamping nut 14 threaded onto it.
  • the inner end of the adjusting nut 13 is provided with a flange 15 against which the web of an outer spring cover 16 is clamped by the nut 14.
  • the outer spring cover 16 is provided with 8.
  • the tension discs 6 there are three of the tension discs 6 to provide two separate thread paths for two needle threads which are placed individually between the discs 6.
  • Turning the adjusting nut 13 will displace the same axially of the arbor 1 to vary the compression of the spring 7 and thus to vary the bias imposed upon the tension discs.
  • the lug 17 on the outer spring cover 16 and the stop arm 13 on the anchor disc 10 limit turning of the adjusting nut 13 to one revolution and thus to a predetermined range of action. To vary the range of action of the tension,
  • the clamping nut 14 is backed 0E to release the outer spring cover 16 and thus provide for rotation of the cover 16 relatively to the adjusting nut 13.
  • Each of the tension discs 6 is circular and has a centrally located aperture 19 for receiving the arbor 1.
  • Each of the discs 6 includes a central flange 22, a peripheral flange 23, and an intermediate raised annular portion 20 upon each face thereof.
  • the raised portions 20 of each of the discs are formed concentrically of the apertures 19 and have planar top surfaces or extremities 21 that are disposed in planes perpendicular to the axis of the apertures 19.
  • the surfaces 21 constitute the thread en gaging surfaces of the discs and cooperate with the cor-- responding surface of the adjacent disc to impose a tension upon a thread running between the discs.
  • the discs 6 can be arranged in pairs to accommodate a single thread or can be arranged in combinations of three, as illustrated in the drawings, to accommodate two threads, or further, can be arranged in combinations of more than three to accommodate three or more threads.
  • This construction is in contrast to the prior dished construction as illustrated in my above noted application Serial No. 692,323 in which the tension discs are made with abutting convex surfaces between which the thread runs.
  • a further advantage of the present invention over the prior dished construction is that they are simpler to manufacture and at the same time produce a more uniform tension.
  • a uniform tension requires that the abutting surface of each disc be planar.
  • the dished tension discs of the prior art were punched from sheet metal, formed into shape by stamping and then hardened. The stamping operation produces stresses in the piece which during the hardening operation produce warping. To minimize warping, the discs are subjected first to a reverse stamping operation in which they are dished in the opposite direction from that of the fiished disc and are then stamped into the finished shape. Another operation in the manufacture of the present tension discs is lapping the stacked discs.
  • the thicknesses of the disc are not uniform, either because of variations in the stock from which they were punched or because of the previous stamping opassesses erations, and because the discs are not bent uniformly and are not uniformly planar; the lapping of one disc with another will not produce identical convex abutting sur- .faces on .-all the discs.
  • ilThe-discsin accordance with the present invention are swaged Yfrom slugs which from the standpoint of avoiding warping gproduces a more :favorable internal structure, and are lapped by parallel grinding wheels.
  • the-discs areuniform and .theabutting faces are planar and parallel, with the result that they will produce a more uniform tension.
  • the raised annular portions 20 effect a spacing of the peripheral flanges .23 when the discs are stacked as illustrated in Fig. 1, thus facilitating i-ntroducingathread between the discs.
  • the central flange 22 is made as small as practical to reduce the bearing surface between thedisc andthearbor .1 to a minimum. This construction reduces the likelihood of the thread .being caught between the edge -.of thedisc about'the hole 19 and the arbor 1, and also permits wobbling of the disc relatively to the arbor 1 to accommodate the thread and to provide for alignment of the :discs relatively'to each other.
  • a thread tension disc for-sewing machines comprising a circular disc that is symmetrical relatively to a plane normal to the axis thereof, said disc having a thin central flange with a centrally located aperture for mounting the same upon the arbor of asewing machine thread tension device, the aperture being dimensioned relatively to the arbor and to the thickness of the central flange to provide for movement of the disc freely rendwise of the arbor and for wobbling of the discupon the arbor, a raised annular portion upon-each face of said disc and arranged concentrically of said aperture, and parallel planar thread engagingsurfaceson said raised annular portions -and-arranged normal to the-axis ofsaid disc.
  • tension discs comprising :a circular disc that issymmetrical .relatively to a plane normal to the axisthereof, said disc having a thin central flange with acentrally located aperture for mounting the same upon the arbor of a sewing machine thread tension device, the aperture being dimensioned relatively to the arbor and to the thickness of the central flange to provide for movement of the disc freely endwise of the arbor and for wobhling Qf the-.disc upon :the arbor, araised annular portion upon each faee of said disc and arranged concentrically :Qf ;s ai d aperture, and parallelplanar threadengaging surfaces onfiaidraised annular portions and arranged normal to the axis ofsaid disc.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US711302A 1958-01-27 1958-01-27 Thread tension device for sewing machines Expired - Lifetime US2986358A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US711302A US2986358A (en) 1958-01-27 1958-01-27 Thread tension device for sewing machines
ES0246351A ES246351A1 (es) 1958-01-27 1959-01-03 UN DISPOSITIVO TENSOR DEL HILO PARA MáQUINAS DE COSER
FR1213318D FR1213318A (fr) 1958-01-27 1959-01-14 Dispositif tendeur de fil pour machine à coudre
GB1499/59A GB853372A (en) 1958-01-27 1959-01-15 Thread tension device for sewing machines
CH6856559A CH369348A (de) 1958-01-27 1959-01-21 Fadenspanneinrichtung für Nähmaschinen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US711302A US2986358A (en) 1958-01-27 1958-01-27 Thread tension device for sewing machines

Publications (1)

Publication Number Publication Date
US2986358A true US2986358A (en) 1961-05-30

Family

ID=24857528

Family Applications (1)

Application Number Title Priority Date Filing Date
US711302A Expired - Lifetime US2986358A (en) 1958-01-27 1958-01-27 Thread tension device for sewing machines

Country Status (5)

Country Link
US (1) US2986358A (de)
CH (1) CH369348A (de)
ES (1) ES246351A1 (de)
FR (1) FR1213318A (de)
GB (1) GB853372A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4545311A (en) * 1984-08-02 1985-10-08 The Singer Company Thread tensioning device for a sewing machine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US209157A (en) * 1878-10-22 Improvement in sewing-machines
US1198545A (en) * 1912-09-18 1916-09-19 Richard K Hohmann Tension mechanism for sewing-machines.
US1312799A (en) * 1919-08-12 moffatt and r
US2189732A (en) * 1938-06-20 1940-02-06 Harpster H Howell Thread tensioning attachment for sewing machines

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US209157A (en) * 1878-10-22 Improvement in sewing-machines
US1312799A (en) * 1919-08-12 moffatt and r
US1198545A (en) * 1912-09-18 1916-09-19 Richard K Hohmann Tension mechanism for sewing-machines.
US2189732A (en) * 1938-06-20 1940-02-06 Harpster H Howell Thread tensioning attachment for sewing machines

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4545311A (en) * 1984-08-02 1985-10-08 The Singer Company Thread tensioning device for a sewing machine

Also Published As

Publication number Publication date
CH369348A (de) 1963-05-15
FR1213318A (fr) 1960-03-31
ES246351A1 (es) 1959-06-16
GB853372A (en) 1960-11-02

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