US3256844A - Sewing machines - Google Patents

Sewing machines Download PDF

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Publication number
US3256844A
US3256844A US286029A US28602963A US3256844A US 3256844 A US3256844 A US 3256844A US 286029 A US286029 A US 286029A US 28602963 A US28602963 A US 28602963A US 3256844 A US3256844 A US 3256844A
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US
United States
Prior art keywords
dogs
feed
needle
movement
fabric
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
US286029A
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English (en)
Inventor
Chezaud Jean Claude
Burillon Pierre
Mangieri Dominique
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.)
Rhodiaceta SA
Original Assignee
Rhodiaceta 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 Rhodiaceta SA filed Critical Rhodiaceta SA
Application granted granted Critical
Publication of US3256844A publication Critical patent/US3256844A/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
    • 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
    • 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
    • D05B27/06—Work-feeding means with feed dogs having horizontal and vertical movements arranged above and below the workpieces
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B73/00—Casings
    • D05B73/04—Lower casings
    • D05B73/12—Slides; Needle plates

Definitions

  • One of the causes of this puckering is the ease with which the various'layers of fabric can slide on one another. It is an object of the present invention to provide an improved machine which reduces or overcomes this difficulty of puckering.
  • an advancing mechanism for a sewing machine such mechanism having upper and lower feed means driven synchronously to close and grip and advance fabric to be sewn, each feed means having two dogs, the downstream dogs being adapted to feed at a higher rate than the upstream dog whereby the fabric is tensioned.
  • Lower and upper feed dogs can have serrations or a fiat surface.
  • the invention also provides a sewing machine including the above advancing mechanism.
  • a method of advancing fabric relative to the needle of a sewing machine comprising simultaneously gripping the fabric between a first set of upper and lower feed dogs upstream of said needle and a second set of upper and lower feed dogs downstream of said needle, moving said first set of feed dogs in a downstream direction at a given rate and simultaneously moving said second set of feed dogs in a downstream direction at a higher rate to advance and tension said fabric.
  • FIGURE 1 shows diagrammatically one embodiment of the present invention, the various parts being shown in the demounted state; 1
  • FIGURES 2a to 2d show diagrammatically the operation of the device according to the invention.
  • FIGURE 3 is a schematic diagram of the control mechanism for closing the embodiment illustrated in URE 1.
  • a sewing plate 1 ha a hole 2 for the passage of the needle (not shown) along the axis xy, and also has apertures in which are mounted the upstream dog 3 and the downstream dog 4 of the lower feed means.
  • a presser foot 5 ha a relatively small surface area so that it does not press on the lower feed dogs.
  • An upper feed means comprises two parts or upper dogs 6 and 7 which are respectively opposite the upstream dog 3 and the downstream dog 4 of the lower feed means. These two dogs can be given a differential advancing movement by means of a mechanism (not shown) which may be the same type used in conventional sewing machines to which there are also connected the two upper dogs, each of these two upper dogs 6 and 7 being given an advancing movement synchronised with that of the corresponding lower dog.
  • the control mechanism is illustrated schematically in FIGURE 3 and will be described below.
  • FIG. 1 A first figure.
  • FIGURES 2a to 2d The way in which the two feed means operate is shown diagrammatically in FIGURES 2a to 2d.
  • the two lower dogs 3 and 4 are at their point of maximum withdrawal relatively to the direction of advance of the fabric (indicated by the arrow the two upper dogs 6 and 7 being similarly positioned.
  • the lower dogs 3 and 4 are retracted below the sewing plate 1 whilst the upper dogs 6 and 7 are situated at a certain distance above the needle plate 1, as is also the needle 8.
  • the two fabrics 9 and 9' which are to be joined together are held in place by the presser foot 5.
  • the lower dogs 3 and 4 and the upper dogs 6 and 7 have carried out their advancing movement.
  • the two downstream dogs 4 and 7 have advanced by an equal distance greater than the advance of the two upstream dogs 3 and 6; the needle then perforates the fabric.
  • FIGURE 2d the upper dogs 6 and 7 have been raised and the lower dogs 3 and 4 have been retracted whilst the presser foot has descended to hold the fabrics.
  • the needle begins its upward return movement.
  • the upper and lower dogs then carry out a withdrawing movement and are once more in the position shown in FIGURE 2a, and a new cycle re-commences.
  • the differential advancing movement, given to the upper and lower feed dogs can, for example, be of the type which is shown schematically in FIGURE 3.
  • the drive shaft 10 transmits a reciprocating movement to the needle bar 12 through a crank and connecting-rod system 11.
  • a movement synchronised with that of the needle 8 is transmitted to the hook shaft 16 by means of direction changes such as bevel gears 13 and 14 and shaft 15.
  • Two eccentrics 17 and 18 fixed to the drive shaft 10 transmit to'the upstream and downstream feed dogs 3 and 4 both an advancing and retracting and a raising and lowering movement.
  • the advance and retracting displacement given to the downstream feed dogs 4 is greater than that given to the upstream feed dogs 3 because of the lever 30 the position of which determines the displacement of dogs 3.
  • the eccentrics 27 and 28 are arranged to advance the upper dog 6 by an amount equal to the advance of the lower dog 3 and to advance the upper dog 7 by an amount equal to the lower dog 4.
  • the eccentric 29 causes alternating of the movement of the presser foot and the upper feed dogs 6 and 7, so that, as the fabric is clamped by the presser foot 5, the fabric acts as a reaction member for the presser foot, so that the feeddogs will rise. Similarly, when the eccentric 29 rotates the feed dogs 6 and 7 grip and react against the fabric, to 'cause raising of the presser foot.
  • a feed mechanism for feeding fabric'to said needle comprising a first set of upper and lower feed dogs upstream of said needle; a second set of upper and lower feed dogs downstream of said needle; means for moving the dogs of each said set from an open position to a closed position synchronously, eifective to grip fabrics to be sewn, said means including a vertically displaceable rotatable horizontal drive shaft, an eccentric mounted on said shaft for rotation therewith and operatively connected to the upper dogs of each of said first and second sets, for raising and lowering of said upper dogs; presser foot means between said first and second sets; said presser foot means being operatively associated with said shaft to grip fabrics to be sewn when said feed dogs are in said open position, said presser foot being vertically displaceable with said shaft, whereby when said shaft rotates said eccentric to cause said upper feed dogs to move downwardly to contact the fabric to be fed, said contact will cause said shaft to move upwardly thus raising said presser foot by reaction; and means for a vertically displaceable rotatable horizontal drive

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US286029A 1962-06-08 1963-06-06 Sewing machines Expired - Lifetime US3256844A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR900219A FR1333138A (fr) 1962-06-08 1962-06-08 Perfectionnements aux machines à coudre

Publications (1)

Publication Number Publication Date
US3256844A true US3256844A (en) 1966-06-21

Family

ID=8780687

Family Applications (1)

Application Number Title Priority Date Filing Date
US286029A Expired - Lifetime US3256844A (en) 1962-06-08 1963-06-06 Sewing machines

Country Status (7)

Country Link
US (1) US3256844A (fr)
CH (1) CH388082A (fr)
ES (1) ES288828A1 (fr)
FR (1) FR1333138A (fr)
GB (1) GB982634A (fr)
NL (1) NL6813633A (fr)
OA (1) OA01610A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3636899A (en) * 1970-03-06 1972-01-25 Union Special Machine Co Top feed mechanism for overedge sewing machine
US4303027A (en) * 1978-07-10 1981-12-01 Tokico, Ltd. Cloth feeding apparatus
US4388880A (en) * 1979-09-07 1983-06-21 Mario Ciucani Machine for stitching the upper border of shoes commonly called moccasins
US4449464A (en) * 1982-10-04 1984-05-22 Porter Robert E Walking foot feed for sewing machines
US5678502A (en) * 1994-03-17 1997-10-21 Porter Sewing Machines, Inc. Variable walking foot apparatus for a sewing machine for mattresses

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US559734A (en) * 1896-05-05 Feeding mechanism for sewing-machf nes
US1679357A (en) * 1923-10-08 1928-08-07 Union Special Machine Co Sewing machine
US2820426A (en) * 1954-08-16 1958-01-21 Pfaff Ag G M Articulated presser foot
FR1162412A (fr) * 1956-12-01 1958-09-12 Rhodiaceta Procédé et dispositif pour l'assemblage par couture d'articles plats doués d'une certaine élasticité

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US559734A (en) * 1896-05-05 Feeding mechanism for sewing-machf nes
US1679357A (en) * 1923-10-08 1928-08-07 Union Special Machine Co Sewing machine
US2820426A (en) * 1954-08-16 1958-01-21 Pfaff Ag G M Articulated presser foot
FR1162412A (fr) * 1956-12-01 1958-09-12 Rhodiaceta Procédé et dispositif pour l'assemblage par couture d'articles plats doués d'une certaine élasticité

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3636899A (en) * 1970-03-06 1972-01-25 Union Special Machine Co Top feed mechanism for overedge sewing machine
US4303027A (en) * 1978-07-10 1981-12-01 Tokico, Ltd. Cloth feeding apparatus
US4388880A (en) * 1979-09-07 1983-06-21 Mario Ciucani Machine for stitching the upper border of shoes commonly called moccasins
US4449464A (en) * 1982-10-04 1984-05-22 Porter Robert E Walking foot feed for sewing machines
US5678502A (en) * 1994-03-17 1997-10-21 Porter Sewing Machines, Inc. Variable walking foot apparatus for a sewing machine for mattresses

Also Published As

Publication number Publication date
GB982634A (en) 1965-02-10
ES288828A1 (es) 1963-12-16
OA01610A (fr) 1969-09-20
NL6813633A (fr) 1968-11-25
FR1333138A (fr) 1963-07-26
CH388082A (fr) 1965-02-15

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