US2609772A - Sewing machine - Google Patents

Sewing machine Download PDF

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Publication number
US2609772A
US2609772A US84607A US8460749A US2609772A US 2609772 A US2609772 A US 2609772A US 84607 A US84607 A US 84607A US 8460749 A US8460749 A US 8460749A US 2609772 A US2609772 A US 2609772A
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US
United States
Prior art keywords
thread
cover
thread tension
sewing machine
tension device
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
US84607A
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English (en)
Inventor
Casas-Robert Ramon
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.)
Mefina SA
Original Assignee
Mefina SA
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 Mefina SA filed Critical Mefina SA
Application granted granted Critical
Publication of US2609772A publication Critical patent/US2609772A/en
Anticipated expiration legal-status Critical
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Classifications

    • 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
    • D05B—SEWING
    • D05B73/00—Casings
    • D05B73/005—Doors or covers for accessing inner parts of the machine; Security devices therefor

Definitions

  • All sewing machines in use at the ⁇ present time include a thread tension device arranged on the thread path between a reserve reel and a thread-puller and protruding in relation to the surface of the casing forming the needlecarrying arm of the sewing machine.
  • a thread tension device arranged on the thread path between a reserve reel and a thread-puller and protruding in relation to the surface of the casing forming the needlecarrying arm of the sewing machine.
  • this thread tension device in manycases, and especially when this thread tension device is mounted on the side front face of the needle-carrying arrn, it happens to be on the straight line between the needle and one or the other eyeof the operator, and therefore considerably hinders the operator during his work. Moreover, it provokes eye strain quickly and induces squinting.
  • the present invention relates to a sewing machine including a needle-carrying arm, constituting a casing and safeguarding the driving mechanism of said machine as well as that of the thread-puller.
  • An object of this machine is to eliminate the mentioned drawbacks by the provision of a ⁇ thread tension device located inside said casing in front of a slot made in one of the walls of said casing and intended for placing the thread in the thread tension device and for the passage of the thread through the thread tension device during the running of the machine.
  • Fig. l is a part longitudinal cross-section View of the needle-carrying arm.
  • Figs. 2 and 3 are detail views.
  • Fig. 4 is a view of thefront face oi the arm, certain parts of the casing being torn oli.
  • FIG. 5 is a detailed View showing the cam and associated structure.
  • the fore front face of the arm I consists of a cover 2 ⁇ pivoting on the arm I.
  • This cover has the general form of a triangle with rounded angles, symmetrically arranged in relation to a medial,
  • a pivot pin El pivot pin
  • the latter includes a pin 'l rigidly fastened to the upper wall of the cover and positioned to be engaged in an opening 9 of a spring blade il, rigidly fixed by one'of its ends to the arm I. a controlling part IQ, emerging from the arm I through a hole I I made in its upper wall.
  • the thread tension device and its driving device are located in the lower part of the cover and fixed to the internal part of the latter, means being provided to shelter it from oil splashes.
  • the thread tension device consists of a hollow axle I2, rigidly fastened to a plate base I3, fastened to the cover 2, and two flanges lil and I5 revolving freely on this axle I2.
  • a washer I E revolving freely on this axle I2 is inserted between the twofiianges. ⁇
  • the thread tension driving device includes a revolving driving member Il, mounted on a pivot i8, rigidly fixed to the internal wall IQ of the cover and mechanically connected to a mobile stop 2li, subjected to an elastic action tending to apply it against the flange Illand to ⁇ press the two anges and the washer It against a shoulder EI of the axle I2.
  • the driving member Il consists of a disc having a hollow 22, of which the bottom constitutes a cam 23 acting in conjunction with a pusher 24 sliding into a guide 25 and acting on the end of a spring blade 25 rigidly fastened to a rocking support 2l.
  • the latter carries an axle 28, revolving,r in bearings formed in ears 29 of the base plate I3.
  • On this support is mounted a second blade spring 38, resting on the axle 28, and of which one of the ends is engaged under the head ⁇ of a screw 55, while its other end is engaged on a rod 3
  • This rod 3l has a head 32 on which is seated the blade 3l).
  • the tension device is further provided, like other tension devices ofknown types, with a device Vcompensating thread tension, absorbing shocks and catching-up the slack of the thread portion situated between the thread tension device and the thread-puller 33 and caused by the periodical movement of the latter.
  • This device includes a spiral spring 343, of ⁇ which one of the ends is curved in the shape of a linger parallel to the axle I2, while its other end has a beak 35, engaged in a housing made in an adjusting l
  • This blade :8 further carries member 31, which revolves with friction on the axle I2.
  • This adjusting member includes an adjusting finger 38 emerging from the cover through a slot 39 in form of an arc of circle concentric to the axle I2.
  • the sewing machine shown is fitted with an automatic releasing device for the thread tension device when the presser foot is lifted.
  • This device includes a-controlling lever 4i), fastened to an axle 4I revolving in a bearing 42, fastened to the arm I and carrying at its end a cam 43, of which the ramp 44 acts in conjunction with an actuating member (which is not shown) of the support 5 of the presser foot in order to effect the lifting of the latter against the action of a spring (which is not shown).
  • a U-shaped part 45 of which one of the wings has an extension in form of a finger 46, and of which the middle part includes an extension in the form of a heel 41 pivots on an axle 43 fastened to the arm I.
  • the heel 41 is intended to act in conjunction with the side face 49 of the cam 44, while the finger 46 actuates the rod 3i against the action of the blade spring 3i), in order to push away the mobile stop 20 and to release the iianges I4 and I ⁇ i5 and the Washer IB of the thread tension device.
  • the described sewing machine works as follows:
  • the operator By acting on the controlling member II, the operator has the possibility of modifying and fixing at will the value of the elastic action exerted by the spring 3i! and therefore of choosing and iixing the value of the braking action of the thread tension device on the thread or threads going through it. Indeed, by displacing angularly the disc I1, the angular displacement of the cam 23 is effected which defines the axial position of the pusher 24 in its guide and therefore the tension of the springs 2S and 35.
  • the controlling member I1 includes marks 52 made on a conical surface and moving in front of a fixed mark (which is not shown) made on the rim of the cover 2.
  • a fixed mark which is not shown
  • the user has every possible facility for marking the angular position of the controlling member I1 and choosing and fixing at will the value of the desired braking.
  • a part of the disc I1 emerges from the cover 2 through a slot 6I), made in its lower wall.
  • the lower rim of the cover is rounded in the form of an arc of a circle concentric with the pivot I8 and having a diameter equal to that of the small base of the frustum of the disc I1.
  • the upper part of this cover has a width equal to that of the arm.
  • the upper part of the cover 2 is convex in order to permit the housing of the Whole of the needlecarrier within it and thus to avoid the need of providing a plug forming a protuberance in relation to the upper wall of the arm and into which would slide the end of the needle-carrier.
  • the various springs of a same series of springs cannot be exactly identical, particularly as regards the slope of the straight line representing, in rectangular co-ordinates, the strength of the spring as a function of its compression. It follows that, in order to obtain identical sewing machines, it is necessary to gauge the thread tension device, so that for a same position of the controlling member I1, a same value of the braking action on the thread is obtained on all machines.
  • the above described sewing machine makes it possible to carry out very easily such a gauging at the factory. Indeed, it is sufficient for this purpose to place the mark O of the disc I1 in front of the mark made on the rim of the cover 2, then to open the latter by disengaging one from the other the two parts of the spring lock, then to tighten or to loosen the screw 55 holding the blade 30 on the support 21 until the mobile stop 20 comes into contact with the flange I4 without exerting a push on it. Indeed, by tightening or loosening the screw 55, there is the possibility of modifying the elastic action exerted by the blade S on the rod 3I independently from the position of the cam 23, and therefore to correct the manufacturing differences which may exist from one spring to the other.
  • a sewing machine including a needle-carrying arm constitutingr a casing safeguarding the driving mechanism of the machine and comprising a cover constituting the fore front face ofthe needle-carrying arm and having an opening therein for the passage of thread, a thread tension device fastened to the inside wall of said cover, an auxiliary wall forming with said cover a space including said thread tension device and separating said latter from the inside space of the casing safeguarding the said driving mechanisms of the sewing machine.
  • a sewing machine as claimed in claim 1 a hinge vfor said cover fastened to said needlecarrying arm, a lock to keep said cover in closed position.
  • a sewing machine as claimed in claim l and including a control device of the value of the braking action of said thread tension device on the thread comprising a control memberof which a part emerges through said opening made in said cover of said casing for the passage of the thread, a mobile stop, an elastic member acting on said mobile stop, a gauging device of the ⁇ elastic action of said elastic member, a'mechanical connection connecting said control member to said mobile stop, said gauging device being interposed in said mechanical connection, said control member comprising a disc bearing a cam and revolving on a pivot rigidly fastened on the bottom of said cover, a pusher, a guide for said pusher, said guide being fastened to said auX- iliary wall, one end of said pusher cooperating with said cam and the other emerging in said space in which are housed the driving mechanisms or" the sewing machine.
  • a sewing machine including a needle-carrying arm constituting a casing safeguarding the driving mechanism of the machine and comprising a cover constituting the fore front face of the needle-carrying arm and having an opening therein for the passage of thread, a thread tension device fastened to the inside wall.
  • anauxiliary wall forming with said cover a space including said thread tension device and separating said latter from the inside space of the casing safeguarding the said driving mechanisms of the sewing machine and including a control device of the value of the braking action of said thread tension device on the thread comprising a control member of which a part emerges through said opening made in said cover of said casing for the passage of the thread, a mobile stop, an elastic member acting on said mobile stop, a gauging device of the elastic action of said elastic member, a mechanical connection connecting said controlmember to said mobile stop, said gauging device being interposed in said mechanical connection, said control member comprising a disc bearing a cam and revolving on a pivot rigidly fastened on the bottom of said cover, a pusher, a guide for ⁇ said pusher, said guide being fastened to said auxiliary Wall, one end of said pusher cooperating with said cam and the other emerging in said space in which are housed the driving mechanisms of the sewing machine, a rocking member fastened to said auxiliary wall, said rocking
  • said gauging device comprises a blade spring seating on an intermediate point, a screw screwed in said rocking member, one end of said bladespring being engaged under the head of said screw, and the other end of said blade spring being engaged on a rod carrying said mobile stop.
  • a sewing machine as claimed in claim l comprising a presser foot lifting device, said thread tension device including two flanges, a spring pressed member urging the anges together, and means cooperating with the presser foot lifting device for shifting the spring pressed member against the action of its spring to release pressure between the iianges.
  • said thread tension device comprises a pair of ilanges, a hollow axle on which the flanges are revolvably mounted, and a rod traversing said hollow axle, said rod having the mobile stop xed to one end thereof and the other end engaged by said elastic member.
  • a sewing machine including a needle-carrying ar'm constituting a casing safeguarding the driving mechanism of the machine and comprising a cover constituting the fore front face of the needle-carrying arm and having .an opening therein for the passage of thread, a thread tension device fastened to the inside wall of said cover, an auxiliary Wall forming With said cover a space including said thread tension device and separating said latter from the inside space of the casing safeguarding the said driving mechanisms of the sewing machine and including a control device of the value of the braking action of said thread tension device on the thread comprising a control member of which a part emerges through said opening made in said cover of said casing for the passage of the thread, a mobile stop, an elastic member acting on said mobile stop, a gauging device of the elastic action of said elastic member, a mechanical connection connecting said control organ to said mobile stop, said gauging device being interposed in said mechanical connection, said control organ comprising a disc bearing a cam and revolving on a pivot rigidly fastened on the bottom
  • said gauging device comprises a blade spring, a support carried by the cover, a screw securing oneV end of said blade spring to said support, and the other end of said blade spring is engaged on a rod carrying said mobile stop.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US84607A 1948-12-20 1949-03-31 Sewing machine Expired - Lifetime US2609772A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH673714X 1948-12-20

Publications (1)

Publication Number Publication Date
US2609772A true US2609772A (en) 1952-09-09

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Application Number Title Priority Date Filing Date
US84607A Expired - Lifetime US2609772A (en) 1948-12-20 1949-03-31 Sewing machine

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US (1) US2609772A (en(2012))
BE (1) BE492539A (en(2012))
CH (1) CH276111A (en(2012))
FR (1) FR1002705A (en(2012))
GB (1) GB673714A (en(2012))
NL (1) NL80762C (en(2012))

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2733025A (en) * 1956-01-31 sporney
US2764366A (en) * 1954-01-27 1956-09-25 White Sewing Machine Corp Thread tensioning device for sewing machines
US2957645A (en) * 1957-02-21 1960-10-25 Pfaff Ag G M Device for adjusting the tension of the upper thread of sewing machines
US2965058A (en) * 1958-09-18 1960-12-20 Singer Mfg Co Thread tension device for sewing machines
US3190249A (en) * 1962-01-10 1965-06-22 Gegauf Fritz Ag Tensioning device for the upper thread in a sewing machine
US3347195A (en) * 1963-12-20 1967-10-17 Gegauf Fritz Ag Tensioning device for a sewing machine
US3366083A (en) * 1966-05-26 1968-01-30 Singer Co Thread tensioning device for sewing machines
US3557731A (en) * 1968-12-06 1971-01-26 Mefina Sa System for adjusting the tension of the upper thread in a sewing machine
US3667414A (en) * 1970-09-25 1972-06-06 Singer Co Thread tensioning device for sewing machines
US3792674A (en) * 1969-11-04 1974-02-19 Mefina Sa Sewing machine
US4111141A (en) * 1975-06-23 1978-09-05 Western Stamping Corporation Thread tensioner
US4141306A (en) * 1976-12-10 1979-02-27 The Singer Company Thread tensioning apparatus for sewing machines
US4180006A (en) * 1978-03-31 1979-12-25 The Singer Company Tension selecting mechanism for sewing machines
US4372502A (en) * 1981-03-23 1983-02-08 The Singer Company Adjustable thread tensioning device for a sewing machine
FR2549105A1 (fr) * 1983-07-11 1985-01-18 Singer Co Dispositif d'enfilage pour une machine a coudre
US4611547A (en) * 1984-06-13 1986-09-16 Janome Sewing Machine Co., Ltd. Upper thread tension device of a sewing machine
US6055920A (en) * 1997-05-22 2000-05-02 Brother Kogyo Kabushiki Kaisha Sewing machine with both needle bar rocking and thread tension releasing mechanisms actuated by single actuator

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4947773A (en) * 1989-07-20 1990-08-14 Jean Blanc Ferdinand H Thread guide ring for a needle bar

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US154084A (en) * 1874-08-11 Improvement in sewing-machines
US994509A (en) * 1910-07-09 1911-06-06 Singer Mfg Co Thread-controller for sewing-machines.
US1507597A (en) * 1923-02-15 1924-09-09 Charles H Greenwood Sewing machine
US1518494A (en) * 1922-05-02 1924-12-09 Elcock Robert Tensioning device for sewing machines
US2298767A (en) * 1940-06-03 1942-10-13 Union Special Machine Co Closure hinge means
USRE22822E (en) * 1946-12-24 Sewing machine arm

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US154084A (en) * 1874-08-11 Improvement in sewing-machines
USRE22822E (en) * 1946-12-24 Sewing machine arm
US994509A (en) * 1910-07-09 1911-06-06 Singer Mfg Co Thread-controller for sewing-machines.
US1518494A (en) * 1922-05-02 1924-12-09 Elcock Robert Tensioning device for sewing machines
US1507597A (en) * 1923-02-15 1924-09-09 Charles H Greenwood Sewing machine
US2298767A (en) * 1940-06-03 1942-10-13 Union Special Machine Co Closure hinge means

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2733025A (en) * 1956-01-31 sporney
US2764366A (en) * 1954-01-27 1956-09-25 White Sewing Machine Corp Thread tensioning device for sewing machines
US2957645A (en) * 1957-02-21 1960-10-25 Pfaff Ag G M Device for adjusting the tension of the upper thread of sewing machines
US2965058A (en) * 1958-09-18 1960-12-20 Singer Mfg Co Thread tension device for sewing machines
US3190249A (en) * 1962-01-10 1965-06-22 Gegauf Fritz Ag Tensioning device for the upper thread in a sewing machine
US3347195A (en) * 1963-12-20 1967-10-17 Gegauf Fritz Ag Tensioning device for a sewing machine
US3366083A (en) * 1966-05-26 1968-01-30 Singer Co Thread tensioning device for sewing machines
US3557731A (en) * 1968-12-06 1971-01-26 Mefina Sa System for adjusting the tension of the upper thread in a sewing machine
US3792674A (en) * 1969-11-04 1974-02-19 Mefina Sa Sewing machine
US3667414A (en) * 1970-09-25 1972-06-06 Singer Co Thread tensioning device for sewing machines
US4111141A (en) * 1975-06-23 1978-09-05 Western Stamping Corporation Thread tensioner
US4141306A (en) * 1976-12-10 1979-02-27 The Singer Company Thread tensioning apparatus for sewing machines
US4180006A (en) * 1978-03-31 1979-12-25 The Singer Company Tension selecting mechanism for sewing machines
US4372502A (en) * 1981-03-23 1983-02-08 The Singer Company Adjustable thread tensioning device for a sewing machine
FR2549105A1 (fr) * 1983-07-11 1985-01-18 Singer Co Dispositif d'enfilage pour une machine a coudre
US4611547A (en) * 1984-06-13 1986-09-16 Janome Sewing Machine Co., Ltd. Upper thread tension device of a sewing machine
US6055920A (en) * 1997-05-22 2000-05-02 Brother Kogyo Kabushiki Kaisha Sewing machine with both needle bar rocking and thread tension releasing mechanisms actuated by single actuator

Also Published As

Publication number Publication date
GB673714A (en) 1952-06-11
CH276111A (fr) 1951-06-30
BE492539A (en(2012))
FR1002705A (fr) 1952-03-10
NL80762C (en(2012))

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