US3828704A - Combined upper and lower feed for sewing machines - Google Patents

Combined upper and lower feed for sewing machines Download PDF

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Publication number
US3828704A
US3828704A US00332549A US33254973A US3828704A US 3828704 A US3828704 A US 3828704A US 00332549 A US00332549 A US 00332549A US 33254973 A US33254973 A US 33254973A US 3828704 A US3828704 A US 3828704A
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US
United States
Prior art keywords
pressure foot
fabric
spring
slide
fabric slide
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
US00332549A
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English (en)
Inventor
Hagen W Von
H Gauch
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.)
Union Special GmbH
Original Assignee
Union Special GmbH
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Filing date
Publication date
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Publication of US3828704A publication Critical patent/US3828704A/en
Assigned to BT COMMERCIAL CORPORATION reassignment BT COMMERCIAL CORPORATION SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: UNION SPECIAL CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B27/00—Work-feeding means
    • D05B27/02—Work-feeding means with feed dogs having horizontal and vertical movements
    • D05B27/04—Work-feeding means with feed dogs having horizontal and vertical movements arranged above the workpieces

Definitions

  • ABSTRACT Schroeder Attorney, Agent, or FirmDiller Brown Ramik & Wight [5 7] ABSTRACT
  • the upper feed assembly includes a pressure foot and a separate upper fabric slide which operates in conjunction with a lower fabric slide.
  • the pressure foot is constantly resiliently urged towards the needle plate and the mounting means for the upper fabric side includes a spring and means for compressing the spring and tightly applying the upper fabric slide against fabric during the feeding movement thereof with the force required to compress the spring reacting against the means resiliently retaining the pressure foot in place so as to reduce the pressure exerted by the pressure foot during the feeding of fabric relative thereto while at the same time permitting the restoring of the pressure on the pressure foot during the retracting movement of the fabric slides.
  • the lower fabric slide may also have incorporated therein a spring resiliently urging the same towards the pressure foot with the combined reactive forces of the fabric slides springs being less than that applied on the pressure foot.
  • the invention relates to a combined upper and lower conveyance device for sewing machines having a resiliently mounted pressure foot and driven upper and lower fabric slides.
  • the pressure foot is not lifted by the lower fabric slide.
  • a special drive is provided for lifting of the pressure foot, which drive lifts the pressure foot alternatingly with the upper fabric slide.
  • the lower fabric slide does not carry out any lifting movement on the pressure foot.
  • the present invention is based on the objective of creating a combined upper and lower fabric conveyance device for sewing machines with a resiliently mounted pressure foot and driven upper and lower fabric slides, which guarantees a satisfactory fabric feed even at high sewing speeds and which adjusts automatically to any given thickness of fabric.
  • This objective is achieved essentially by limiting the movement of the lower fabric slide away from the needle plate to an extent avoiding a lifting movement of the pressure foot and urging the pressure foot constantly against the needle plate or the sewing material on it.
  • the pressure foot will stop at a level adjusted automatically to the fabric thickness and is not lifted by the lower fabric slide.
  • the pressure foot system does not begin to vibrate, and even in case of high sewing speeds a satisfactory fabric feed will be achieved.
  • the lower fabric feed, carrying out a lifting movement in a customary manner is urged under the action of a spring in the direction of the pressure foot, the force of this spring being less than the spring power, urging the pressure foot against the needle plate and the lower fabric slide.
  • a spring loading of the lower fabric slide a secure engagement of the teeth of the lower fabric slide with the fabric will be guaranteed without lifting the pressure foot.
  • the lower fabric slide has a reciprocating movement without lifting movement and moves with the upper edge of its teeth in the plane of the upper edge of the needle plate.
  • This embodiment with a non-vertical movement lower fabric slide is particularly advantageous in case of a connection of the upper fabric slide with the pressure foot by way of a ternary member, which is spring loaded against the needle plate and which has an upper fabric slide resiliently mounted with respect to its driving parts.
  • the pressure foot upon engagement of the upper fabric slide is relieved of the spring force of the spring acting on the upper fabric slide and permits an easy lifting thereof by the fabric.
  • FIG. 1 is a side elevational view of a sewing machine with portions broken away and shows the essential parts of the drive for a combined upper and lower fabric conveyance device.
  • FIGS. 2a and 2b are schematic elevational views showing the combined upper and lower fabric conveyance device in different operating positions.
  • the combined upper and lower fabric conveyance device is shown in connection with a so-called flat bed sewing machine.
  • a frame 1 of the lower fabric slide is articulately connected with a lever 3 attached on a rocking shaft 2.
  • the lever 3 imparts a reciprocating movement to the frame 1 and thus to the lower fabric slide 4 carried thereby.
  • the fabric slide 4 is given a lifting movement in the customary manner by a lift shaft 5 and by an eccentric 6 disposed thereon.
  • the entire arrangement is disposed in the lower bed 7 of the sewing machine.
  • the pressure foot arrangement and the drive of the upper fabric slide are mounted in a customary manner in the head 9 of the machine.
  • the pressure foot rod 11, which carries the pressure foot 12 at its lower end, is articulated to a ternary member 13.
  • the upper fabric slide 14 is articulated to a rod 15, which also is in articulated connection with the ternary member 13.
  • the upper fabric slide 14 is urged by the action of a spring 16 against a needle plate 17, from which the lower fabric slide 4 emerges upwardly.
  • the pressure foot rod 11 is under the influence of a spring 18.
  • the ternary member 13 is connected by way of a connecting joint bar 19 with a lever 21 of a swinging shaft 22.
  • This swinging shaft 22 imparts an up and down motion to the rod 15.
  • the swinging shaft 23 is connected with the rod by a swingle or forked lever by way of a lever 24.
  • a sliding guide 25 is placed between the lever 24 and the rod 15.
  • the lift eccentric 6 for the lower fabric slide 4 is articulatedly connected with a lever 27 by way of ajoint bar 26, which lever is articulated to the carrier 1 and is subject to the action of a spring 28.
  • the movement of the lever 27 is limited by the head 29 of the spring bolt 30.
  • the spring 28 urges the lower fabric slide 4 towards the upper fabric slide 14 and the pressure foot 12.
  • FIGS. 2a and 2b the arrangement is shown schematically in two different positions. At the same time and for the better understanding, insignificant changes in the structure have been made in relation to FIG. 1, which however are without influence on the basic function of the arrangement.
  • FIG. 2a shows the arrangement during the fabric feed and FIG. 2b during the return of the fabric slides.
  • the lower fabric slide 4 is lifted. But it only lifts to a point at which the pressure foot 12, being under pressure from the spring 18, resists such movement. In order to avoid any further lifting of the pressure foot 12, the lower fabric slide 4 has been resiliently mounted in relation to its lifting drive by the spring 28. The force of the spring 28 is weaker than the force of the spring 18, reduced by the force of the spring 16. The lower fabric slide 4 therefore, emerges from the needle plate only far enough so that its teeth are buried in the fabric that is to be moved forward without however lifting the pressure foot 12.
  • a fabric feeding device for a sewing machine comprising a needle plate, a pressure foot, first means mounting said pressure foot for cooperation with said needle plate including a pressure foot spring constantly urging said pressure foot towards said needle plate, a lower fabric slide disposed in cooperating relation with said pressure foot, second means mounting said lower fabric slide for reciprocating movement generally parallel to said needle plate, third means connected to said pressure foot for reducing the effective pressure of said pressure foot spring on said pressure foot during the fabric feeding movement of said lower fabric slide and said lower fabric slide projects through said needle plate only to the extent that fabric being sewn is effec tively gripped thereby, and means limiting such projection to one wherein lifting movement of said pressure foot is avoided.
  • a fabric feeding device for a sewing machine comprising a needle plate, a pressure foot, first means mounting said pressure foot for cooperation with said needle plate including a pressure foot spring constantly urging said pressure foot towards said needle plate, a lower fabric slide disposed in cooperating relation with said pressure foot, second means mounting said lower fabric slide for reciprocating movement generally parallel to said needle plate, third means connected to said pressure foot for reducing the effective pressure of said pressure foot spring on said pressure foot during the fabric feeding movement of said lower fabric slide said second means includes a lower fabric slide spring resiliently urging said lower fabric slide towards said pressure foot, and the effective force of said lower fabric slide spring is less than that of said pressure foot spring.
  • a fabric feeding device for a sewing machine comprising a needle plate, a pressure foot, first means mounting said pressure foot for cooperation with said needle plate including a pressure foot spring constantly urging said pressure foot towards said needle plate, a lower fabric slide disposed in cooperating relation with said pressure foot, second means mounting said lower fabric slide for reciprocating movement generally parallel to said needle plate, third means connected to said pressure foot for reducing the effective pressure of said pressure foot spring on said pressure foot during the fabric feeding movement of said lower fabric slide, said second means mount said lower fabric slide for reciprocating movement only, and said lower fabric slide has fabric engaging teeth with upper edges lying substantially in the plane of the upper surface of said needle plate.
  • a fabric feeding device for a sewing machine comprising a needle plate, a pressure foot, first means mounting said pressure foot for cooperation with said needle plate including a pressure foot spring constantly urging said pressure foot towards said needle plate, a lower fabric slide disposed in cooperating relation with said pressure foot, second means mounting said lower fabric slide for reciprocating movement generally parallel to said needle plate, third means connected to said pressure foot for reducing the effective pressure of said pressure foot spring on said pressure foot during the fabric feeding movement of said lower fabric slide, an upper fabric slide, and fourth means mounting said upper fabric slide for cooperation with said lower fabric slide and for reciprocating movement in unison therewith.
  • said fourth means includes an upper fabric slide spring urging said upper fabric slide towards said needle plate
  • said third means includes means for actuating said fourth means to move said upper fabric slide towards said needle plate compressing said upper fabric slide spring and transferring the force thereof to oppose the force of said pressure foot spring and thus relieve the effective pressure of said pressure foot spring.
  • first and fourth means include first and second support rods for said pressure foot and said upper fabric slide respectively
  • said third means includes a ternary member separately pivotally connected to said first and second support ends, and actuating means connected to said ternary member to effect pivoting thereof in timed relation to the reciprocation of said upper and lower fabric slides.
  • connection between said ternary member and said first support rod defines a pivot for said ternary member.
  • said fourth means includes an upper fabric slide spring extending between said upper fabric slide and said second support rod and said ternary member being operable when pivoted to depress said second support rod against the force of said upper fabric slide springand transfer the reaction therefrom to said pressure foot spring to reduce the force exerted thereby on said pressure foot.
  • connection between said ternary member and said first support rod defines a pivot for said ternary member.
  • said second means includes a lower fabric slide spring resiliently urging said lower fabric slide towards said pressure foot, and the combined effective force on said pressure foot of said upper and lower fabric slide springs is less than that of said pressure foot spring.
  • said second mounting means include spring means for biasing said lower fabric slide in a direction towards that upper fabric slide
  • said fourth mounting means includes spring means for biasing said upper fabric slide in a direction towards said lower fabric slide

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US00332549A 1972-02-19 1973-02-15 Combined upper and lower feed for sewing machines Expired - Lifetime US3828704A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2207897A DE2207897A1 (de) 1972-02-19 1972-02-19 Kombinierter ober- und untertransport fuer naehmaschinen

Publications (1)

Publication Number Publication Date
US3828704A true US3828704A (en) 1974-08-13

Family

ID=5836490

Family Applications (1)

Application Number Title Priority Date Filing Date
US00332549A Expired - Lifetime US3828704A (en) 1972-02-19 1973-02-15 Combined upper and lower feed for sewing machines

Country Status (6)

Country Link
US (1) US3828704A (it)
JP (1) JPS4893448A (it)
DE (1) DE2207897A1 (it)
FR (1) FR2172732A5 (it)
GB (1) GB1417459A (it)
IT (1) IT977397B (it)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3927629A (en) * 1973-10-20 1975-12-23 Pfaff Ind Masch Sewing machine presser foot and feed dog lifting mechanism
US3935826A (en) * 1973-07-26 1976-02-03 Durkoppwerke Gmbh Method of and apparatus for feeding a workpiece along a surface of a sewing machine
US4216734A (en) * 1979-03-26 1980-08-12 The Singer Company Sewing machine with universal upper feed
US4513675A (en) * 1982-05-06 1985-04-30 Kochs Adler Ag Presser foot automatic lifting device
US4936235A (en) * 1987-07-27 1990-06-26 Pfaff Industriemaschinen Gmbh Sewing machine with an upper transport mechanism
US5201273A (en) * 1990-09-25 1993-04-13 Durkopp Adler Aktiengesellschaft Top-feed sewing machine with presser device
US5653187A (en) * 1994-09-22 1997-08-05 Juki Corporation Upper feed mechanism for sewing machine and sewing machine having the same
US6415727B1 (en) 1998-03-09 2002-07-09 Diversified Systems, Inc. Flanging machine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3040286C2 (de) * 1980-10-25 1985-03-07 Optilon W. Erich Heilmann GmbH, Cham Nähmaschine zum Aufnähen einer aus zwei Reißverschlußgliederreihen bestehenden Reißverschlußgliederkette
KR100465423B1 (ko) * 1996-01-30 2005-05-09 뒬코프 아들러 악틴게젤샤프트 상부이송장치부재봉틀
CN110485067A (zh) * 2019-09-06 2019-11-22 杰克缝纫机股份有限公司 一种缝纫机抬压脚助力抬升的控制方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2470759A (en) * 1947-10-18 1949-05-24 Singer Mfg Co Feeding mechanism for sewing machines
AT171556B (de) * 1949-04-15 1952-06-10 Singer Mfg Co Nähmaschine
US3437062A (en) * 1966-10-11 1969-04-08 Singer Co Mechanism for automatically adjusting the height of a top feed foot
US3495560A (en) * 1968-08-14 1970-02-17 Singer Co Presser device for sewing machines
US3570427A (en) * 1969-07-02 1971-03-16 Pfaff Ag G M Top feed means for sewing machines
US3583344A (en) * 1969-07-02 1971-06-08 Pfaff Ag G M Top feed means for sewing machines
US3614934A (en) * 1968-08-21 1971-10-26 Pfaff Ag G M Sewing machine with upper feed
US3623441A (en) * 1969-11-21 1971-11-30 Union Special Machine Co Presser mechanism for sewing machines

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2470759A (en) * 1947-10-18 1949-05-24 Singer Mfg Co Feeding mechanism for sewing machines
AT171556B (de) * 1949-04-15 1952-06-10 Singer Mfg Co Nähmaschine
US3437062A (en) * 1966-10-11 1969-04-08 Singer Co Mechanism for automatically adjusting the height of a top feed foot
US3495560A (en) * 1968-08-14 1970-02-17 Singer Co Presser device for sewing machines
US3614934A (en) * 1968-08-21 1971-10-26 Pfaff Ag G M Sewing machine with upper feed
US3570427A (en) * 1969-07-02 1971-03-16 Pfaff Ag G M Top feed means for sewing machines
US3583344A (en) * 1969-07-02 1971-06-08 Pfaff Ag G M Top feed means for sewing machines
US3623441A (en) * 1969-11-21 1971-11-30 Union Special Machine Co Presser mechanism for sewing machines

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3935826A (en) * 1973-07-26 1976-02-03 Durkoppwerke Gmbh Method of and apparatus for feeding a workpiece along a surface of a sewing machine
US3927629A (en) * 1973-10-20 1975-12-23 Pfaff Ind Masch Sewing machine presser foot and feed dog lifting mechanism
US4216734A (en) * 1979-03-26 1980-08-12 The Singer Company Sewing machine with universal upper feed
US4513675A (en) * 1982-05-06 1985-04-30 Kochs Adler Ag Presser foot automatic lifting device
US4936235A (en) * 1987-07-27 1990-06-26 Pfaff Industriemaschinen Gmbh Sewing machine with an upper transport mechanism
US5201273A (en) * 1990-09-25 1993-04-13 Durkopp Adler Aktiengesellschaft Top-feed sewing machine with presser device
US5653187A (en) * 1994-09-22 1997-08-05 Juki Corporation Upper feed mechanism for sewing machine and sewing machine having the same
US6415727B1 (en) 1998-03-09 2002-07-09 Diversified Systems, Inc. Flanging machine

Also Published As

Publication number Publication date
GB1417459A (en) 1975-12-10
FR2172732A5 (it) 1973-09-28
IT977397B (it) 1974-09-10
JPS4893448A (it) 1973-12-03
DE2207897A1 (de) 1973-08-23

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Legal Events

Date Code Title Description
AS Assignment

Owner name: BT COMMERCIAL CORPORATION

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

Effective date: 19851220

Owner name: BT COMMERCIAL CORPORATION, STATELESS

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

Effective date: 19851220