US3797426A - Controlled thread tensioner for sewing machines - Google Patents

Controlled thread tensioner for sewing machines Download PDF

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Publication number
US3797426A
US3797426A US00240208A US3797426DA US3797426A US 3797426 A US3797426 A US 3797426A US 00240208 A US00240208 A US 00240208A US 3797426D A US3797426D A US 3797426DA US 3797426 A US3797426 A US 3797426A
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US
United States
Prior art keywords
control
permanent magnet
cooperating
discs
bolt
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
US00240208A
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English (en)
Inventor
Hagen W Von
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Union Special GmbH
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Union Special GmbH
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Publication date
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Publication of US3797426A publication Critical patent/US3797426A/en
Assigned to BT COMMERCIAL CORPORATION reassignment BT COMMERCIAL CORPORATION SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: UNION SPECIAL CORPORATION
Assigned to UNION SPECIAL CORPORATION reassignment UNION SPECIAL CORPORATION RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: BT COMMERCIAL CORPORATION
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Expired - Lifetime legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B47/00—Needle-thread tensioning devices; Applications of tensometers
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2207/00—Use of special elements
    • D05D2207/05—Magnetic devices
    • D05D2207/06—Permanent magnets

Definitions

  • D05b 47/04 sewmg machmes Whlch Includes a 0f [58] Field of Search n 1 12/254, 255; 242/150, sitely movable tension discs, one of which is under the 242/150 M 155 M; 335/176 influence of a control bolt, and which control bolt has a portion thereof positioned adjacent a permanent [56] References Cited magnet carried by a control shaft of the sewing ma- UNITED STATES PATENTS chine for automatically shifting the position of the control bolt in timed relation to the operation of the L223??? i; 13;;;
  • This invention relates in general to new and useful improvements in sewing machines, and more specifi cally to a controlled thread tensioner for sewing machines.
  • the basic structure of the thread tensioner is conventional and the invention relates to the utilization of a control bolt for varying the relationship between the tension discs so as to vary the tension applied to thread drawn therebetween, the control bolt being at:- tuated by a permanent magnet carried by a control shaft.
  • Controlled thread tensioners are well known and several means are provided for effecting the operation thereof.
  • the control bolt acting on a movable tension disc is guided radially towards a main shaft of a sewing machine with the tension disc being under pressure from adjustable springs which provide the braking force of the tension discs on the thread.
  • a con trol cam is placed on the main shaft of the sewing machine with the control cam being operable to move the control bolt to counter the force of the spring and thus reduce the thread tension from time to time.
  • Thread tensioners controlled in the manner set forth above operate relatively inaccurately since the control bolt is pressed against the control cam only by means of the spring which urge the tension discs together. With increasing machine speed, the spring no longer follows exactly the opening and closing movement of the control bolt. Moreover, the parts of the control bolt and of the control cam rub against each other while subject to a relatively high degree of wear.
  • control shaft with a permanent magnet which cooperates either directly with the control bolt or with a ferritic part attached thereto so as to effect a variation in thread tension without there being a physical connection between the control shaft and permanent magnet carried thereby on the one hand and the control bolt or part carried thereby on the other hand.
  • the permanent magnet is embedded in an adjusting ring or collar placed on the control shaft.
  • the control bolt on the end thereof carrying the tension discs, is connected with a bridge disc which reaches around and through a slider casing encompassing the control bolt.
  • the control bolt itself is screwed into a non-twistable guide shoe.
  • the control bolt can be screwed into and out of the guide shoe by turning the slotted casing, as a result of which the shoe shifts radially of the control shaft in order to change the magnetic force produced by the magnetic field with respect to the control bolt.
  • FIG. 1 is a sectional view taken through the thread tensioner and shows the relationship thereof with respect to a control shaft of a sewing machine, the sewing machine housing being shown in phantom lines.
  • FIG. 2 is a side elevational view of the control bolt and the components directly carried thereby.
  • FIG. 4 is a fragmentary sectional view similar to FIG. 1 and shows a slightly modified form of means for retaining the normal relationship of the tension discs.
  • FIG. 5 is a sectional view through the control shaft showing a modified permanent magnet arrangement carried thereby.
  • the thread tensioner consists in the customary manner of two tension discs 1,2 which are placed on a slotted end portion of a sleeve 3.
  • the sleeve 3 is inserted in a bore in a mounting sleeve 4 and is held in an adjusted position by means of a set screw 5.
  • the mounting sleeve 4 is positioned within an eye 6 of a conventional sewing machine housing 7 and is retained in an adjusted position therein by means of a set screw 8.
  • a control bolt 9' is slidable mounted within the sleeve 3 and on one end thereof there is positioned a bridge disc 11. It is to be noted that adjacent the end thereof, the control bolt 9 is of a reduced section and the bridge disc 11 is provided with a narrow bridge 12 which interlocks with the control bolt 9 so that the bridge disc 11 is movable with the control bolt 9. As is clearly shown in FIG. 3, the bridge disc 11 is also provided with suitable openings which receive the slotted portion of the sleeve 3 so as to interlock the bridge disc with the sleeve 3.
  • the control bolt 9 has the opposite end thereof threaded into a shoe 13 which is positioned within a slot formed in the left-hand face of the mounting sleeve 4, as viewed in FIG. 1 so as to be guided for movement only axially of the control bolt 9.
  • the guide shoe 13, in turn, carries an arcuate disc 14 with the shoe 13, cooperating with the mounting sleeve 4, preventing rotation of the disc 14.
  • the slotted portion of the sleeve 3 which extends beyond the bridge disc 11 is provided with threads and has an enlarged nut 19 threaded thereon followed by a locking nut which locks the nut 19 in an adjusted position relative to the sleeve 3 and permits the rotation of the sleeve 3 and the control bolt 9 upon rotation of the nut 19.
  • damping member 21 which is preferably in the form of a ring of damping material, for example, rubber.
  • the damping member could consist just as well of a spring, such as is shown in FIG. 4 with the spring being identified by the numeral 22. It is to be understood that a certain constant tension force is imparted to the tension disc by the damping member 21 through the positioning of the nut 19.
  • the primary purpose of the damping member 21 is to serve to supress vibrations of the tension discs 1,2 held against each other. without tension, during operation of the sewing machine.
  • control bolt 9 may be rotated through the bridge disc 11 thus changing the relationship of the control bolt 9 with respect to the guide shoe 13.
  • rotation of the control bolt 9 will result in the shifting of the guide shoe 13 axially of the control bolt and in the illustrated form of the invention shown in FIG. 1, radially in relation to the shaft 18.
  • the gap between the disc 14 and the outside surface of the permanent magnet 16 can be changed in order to change the clamping power exerted by the permanent magnet on the tension discs 1,2.
  • the shaft 18 may be provided with a mounting ring 23 which differs from the mounting ring 15 in that it is provided with separate sockets for the reception of a plurality of permanent magnets 24.
  • the flux line 25 by utilizing a plurality of smaller permanent magnets in lieu of a single large permanent magnet, the desired circumferential extent of the force field may be obtained with the force field being more uniform throughout the circumferential extent thereof.
  • a controlled thread tensioner for sewing machines and like equipment having a rotating control shaft, a pair of opposed cooperating thread tensioning discs, means normally holding said discs in cooperating thread tensioning relation, said means including a pressure control disc, 21 control bolt coupled to said control disc for positioning said control disc and controlling the pressure engagement between said cooperating discs, permanent magnet means carried by said control shaft, and means directly reacted upon by said magnet means once during each revolution of said control shaft directly movable with said control bolt for positioning said control bolt and effecting one tensioning cycle of said cooperating discs per control shaft revolution, said control bolt carrying a magnetic reactive part and positioning the same immediately adjacent the path of said permanent magnet means, and said control bolt including adjusting means for adjusting the spacing between said control disc and said magnetic reactive part to vary the position of said magnetic reactive part relative to said permanent magnet means path and thus vary the clamping effect of said control bolt on said cooperating discs.
  • said magnetic reactive part includes a guide shoe, and fixed means cooperating with said guide shoe for restricting movement of said guide shoe to movement axially of said control bolt.
  • control bolt is slidably mounted in a casing, said casing passing through said control disc, and means carried by said casing reacting on said control disc to maintain a normal relationship between said cooperating discs, and movement of said bolt by said permanent magnet means is in a direction to increase the pressure engagement between said cooperating discs.
  • said permanent magnet means includes at least two circumferentially spaced and cooperating permanent magnets for reacting in unison on said means reacted upon by said magnets and having a magnet field of controlled circumferential extent and of generally uniform magnitude.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US00240208A 1971-04-22 1972-03-31 Controlled thread tensioner for sewing machines Expired - Lifetime US3797426A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2119592A DE2119592C3 (de) 1971-04-22 1971-04-22 Gesteuerter Fadenspanner für Nähmaschinen

Publications (1)

Publication Number Publication Date
US3797426A true US3797426A (en) 1974-03-19

Family

ID=5805509

Family Applications (1)

Application Number Title Priority Date Filing Date
US00240208A Expired - Lifetime US3797426A (en) 1971-04-22 1972-03-31 Controlled thread tensioner for sewing machines

Country Status (8)

Country Link
US (1) US3797426A (it)
JP (1) JPS5620034B1 (it)
DD (1) DD96277A5 (it)
DE (1) DE2119592C3 (it)
FR (1) FR2136018A5 (it)
GB (1) GB1370567A (it)
IT (1) IT948705B (it)
NL (1) NL176091C (it)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3996866A (en) * 1974-05-06 1976-12-14 Necchi S.P.A. Upper thread tension adjusting assembly with automatic release device
US4289087A (en) * 1977-03-07 1981-09-15 Janome Sewing Machine Co., Ltd. Sewing machine with thread-tension control system
US4301978A (en) * 1979-04-05 1981-11-24 The Singer Company Electro-magnetic thread tension control for sewing machines
US5305966A (en) * 1991-07-22 1994-04-26 Sobrevin Societe De Brevets Industriels-Etablissement Device for the differential braking of traveling threads, wires or the like
US5398731A (en) * 1993-03-05 1995-03-21 Lindauer Dornier Gesellschaft Mbh Lamellar weft thread brake mechanism with a variable braking force
US5476122A (en) * 1993-03-05 1995-12-19 Lindauer Dornier Gesellschaft Mbh Weft thread brake responsive to yarn characteristics in a loom
NL1002652C2 (nl) * 1996-03-20 1997-09-23 Electrin Holding N V Industriële naaimachine.
US20080118878A1 (en) * 2006-11-17 2008-05-22 Banner Engineering & Sales, Inc. Combustible fuel igniting apparatus
CN103314148A (zh) * 2011-01-12 2013-09-18 希安典型欧洲有限责任公司 面线张紧装置
US8997669B1 (en) * 2014-10-16 2015-04-07 Handi Quilter, Inc. Thread tensioner for a sewing machine
US20160090675A1 (en) * 2014-09-26 2016-03-31 Abm International, Inc. Automatic thread tensioning
US9394639B2 (en) 2014-10-16 2016-07-19 Handi Quilter, Inc. Motorized thread tensioner for a sewing machine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3130373A1 (de) * 1981-07-31 1983-02-17 The Singer Co., 06904 Stamford, Conn. Naehmaschine
DD265654A1 (de) * 1987-11-04 1989-03-08 Textima Veb K Vorrichtung zur steuerung der oberfadenbremskraft

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1862658A (en) * 1931-06-01 1932-06-14 Singer Mfg Co Graduated tension device for sewing machines
US2582211A (en) * 1950-05-20 1952-01-08 Singer Mfg Co Tension releasing device for sewing machines
US2614773A (en) * 1950-11-20 1952-10-21 Mohawk Carpet Mills Inc Tension device
US2650043A (en) * 1950-09-18 1953-08-25 Rarmer Maschinenfabrik Ag Apparatus for maintaining a constant tension in a moving filament
US2698590A (en) * 1951-06-20 1955-01-04 Singer Mfg Co Thread tension regulator for sewing machines
US2768796A (en) * 1954-08-12 1956-10-30 Levine Paul Magnetic thread-tensioners
US2938479A (en) * 1956-12-11 1960-05-31 Merrow Machine Co Thread tensioning control for sewing machines
CH353970A (de) * 1958-07-04 1961-04-30 Burger Rudolf Fadenspanner für fadenverarbeitende Maschinen, z.B. Nähmaschinen
US3041008A (en) * 1958-12-23 1962-06-26 Singer Mfg Co Thread tension device for sewing machines
US3614689A (en) * 1968-10-22 1971-10-19 Ind Electr De La Seine L Tripping devices

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1862658A (en) * 1931-06-01 1932-06-14 Singer Mfg Co Graduated tension device for sewing machines
US2582211A (en) * 1950-05-20 1952-01-08 Singer Mfg Co Tension releasing device for sewing machines
US2650043A (en) * 1950-09-18 1953-08-25 Rarmer Maschinenfabrik Ag Apparatus for maintaining a constant tension in a moving filament
US2614773A (en) * 1950-11-20 1952-10-21 Mohawk Carpet Mills Inc Tension device
US2698590A (en) * 1951-06-20 1955-01-04 Singer Mfg Co Thread tension regulator for sewing machines
US2768796A (en) * 1954-08-12 1956-10-30 Levine Paul Magnetic thread-tensioners
US2938479A (en) * 1956-12-11 1960-05-31 Merrow Machine Co Thread tensioning control for sewing machines
CH353970A (de) * 1958-07-04 1961-04-30 Burger Rudolf Fadenspanner für fadenverarbeitende Maschinen, z.B. Nähmaschinen
US3041008A (en) * 1958-12-23 1962-06-26 Singer Mfg Co Thread tension device for sewing machines
US3614689A (en) * 1968-10-22 1971-10-19 Ind Electr De La Seine L Tripping devices

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3996866A (en) * 1974-05-06 1976-12-14 Necchi S.P.A. Upper thread tension adjusting assembly with automatic release device
US4289087A (en) * 1977-03-07 1981-09-15 Janome Sewing Machine Co., Ltd. Sewing machine with thread-tension control system
US4301978A (en) * 1979-04-05 1981-11-24 The Singer Company Electro-magnetic thread tension control for sewing machines
US5305966A (en) * 1991-07-22 1994-04-26 Sobrevin Societe De Brevets Industriels-Etablissement Device for the differential braking of traveling threads, wires or the like
US5398731A (en) * 1993-03-05 1995-03-21 Lindauer Dornier Gesellschaft Mbh Lamellar weft thread brake mechanism with a variable braking force
US5476122A (en) * 1993-03-05 1995-12-19 Lindauer Dornier Gesellschaft Mbh Weft thread brake responsive to yarn characteristics in a loom
NL1002652C2 (nl) * 1996-03-20 1997-09-23 Electrin Holding N V Industriële naaimachine.
US20080118878A1 (en) * 2006-11-17 2008-05-22 Banner Engineering & Sales, Inc. Combustible fuel igniting apparatus
CN103314148A (zh) * 2011-01-12 2013-09-18 希安典型欧洲有限责任公司 面线张紧装置
US20160090675A1 (en) * 2014-09-26 2016-03-31 Abm International, Inc. Automatic thread tensioning
US10094056B2 (en) * 2014-09-26 2018-10-09 Abm International, Inc. Automatic thread tensioning
US8997669B1 (en) * 2014-10-16 2015-04-07 Handi Quilter, Inc. Thread tensioner for a sewing machine
US9394639B2 (en) 2014-10-16 2016-07-19 Handi Quilter, Inc. Motorized thread tensioner for a sewing machine

Also Published As

Publication number Publication date
NL176091C (nl) 1985-02-18
FR2136018A5 (it) 1972-12-22
DD96277A5 (it) 1973-03-12
DE2119592B2 (de) 1974-07-04
IT948705B (it) 1973-06-11
GB1370567A (en) 1974-10-16
JPS5620034B1 (it) 1981-05-11
NL7201354A (it) 1972-10-24
DE2119592C3 (de) 1975-02-20
DE2119592A1 (de) 1972-11-02
NL176091B (nl) 1984-09-17

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AS Assignment

Owner name: BT COMMERCIAL CORPORATION, STATELESS

Free format text: SECURITY INTEREST;ASSIGNOR:UNION SPECIAL CORPORATION;REEL/FRAME:004610/0215

Effective date: 19851220

Owner name: BT COMMERCIAL CORPORATION

Free format text: SECURITY INTEREST;ASSIGNOR:UNION SPECIAL CORPORATION;REEL/FRAME:004610/0215

Effective date: 19851220

AS Assignment

Owner name: UNION SPECIAL CORPORATION

Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:BT COMMERCIAL CORPORATION;REEL/FRAME:004754/0102

Effective date: 19870707