US3859939A - Presser foot with flex feature - Google Patents

Presser foot with flex feature Download PDF

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Publication number
US3859939A
US3859939A US455531A US45553174A US3859939A US 3859939 A US3859939 A US 3859939A US 455531 A US455531 A US 455531A US 45553174 A US45553174 A US 45553174A US 3859939 A US3859939 A US 3859939A
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US
United States
Prior art keywords
presser
toe
heel
foot component
foot
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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
US455531A
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English (en)
Inventor
Robert B Howell
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Individual
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Individual
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Publication date
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Priority to US455531A priority Critical patent/US3859939A/en
Application granted granted Critical
Publication of US3859939A publication Critical patent/US3859939A/en
Priority to CA223,130A priority patent/CA1026626A/en
Priority to GB12973/75A priority patent/GB1507893A/en
Priority to JP3737175A priority patent/JPS5643755B2/ja
Priority to AU79706/75A priority patent/AU488516B2/en
Priority to CA280,236A priority patent/CA1029255A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B29/00—Pressers; Presser feet
    • D05B29/06—Presser feet

Definitions

  • the foot component has a heel-to-toe downwardly sloping lower presser surface.
  • the foot component has a heel-to-toe downwardly sloping lower presser surface.
  • the toe portion makes contact first and the intermediate portion bends so that the presser surface comes to rest generally flat on the material being sewn.
  • a region of increased material thickness passing under the toe portion raises the toe portion and causes additional bending to occur in the intermediate portion.
  • the increased thickness approaches the rear end of the foot component it lifts the presser bar upwardly against a biasing spring.
  • the toe region remains in contact with the fabric because of the heelto-toe sloping nature of the presser surface.
  • a transverse recess is formed in t 10 Claims, 9 Drawing Figures l PRESSER FOOT WITH FLEX FEATURE BACKGROUND OF THE INVENTION 1.
  • the present invention relates to presser feet for sewing machines, and in particular to the provision of an improved type of presser foot which is especially adapted for sewing materials which include areas of uneven thickness.
  • presser feet which include some sort of spring mountingfor a foot component.
  • the presser foot of this invention is of molded plastic construction and is generally similar to the styles of presser feet disclosed by my aforementioned US. Pat. Nos. 3,342,151; 3,349,736 and 3,473,498. However, unlike such prior feet it is characterized by a reduced thickness intermediate portion between its heel and toe portions which is adapted to function as a leaf spring. It also includes a heel-to-toe sloping presser surface which together with said spring section better enables the presser foot to be used for sewing materials which vary in thickness.
  • One form is also characterized by longitudinal slots dividing it into aplurality of beam sections. Such foot exerts a downward pressure on the fabric on both sides of the sewing path, even when there is a difference in material thickness between the two sides.
  • the illustrated embodiments are presser feet which are especially adapted for use in installing and finishing invisible or concealed zippers. It is believed that incorporation of the invention into such a foot results in a muchimproved zipper foot in comparison to rigid feet. Objectionable puckering is not experienced, even when sewing light weight fabrics. However, it is also believed that the basic principles of the invention may be incorporated into standard presser feet and into other types of specialty presser feet as well.
  • FIG. 1 is a fragmentary pictorial view taken in the needle region of a sewing machine, such view showing a presser foot attachment according to the present invention installed in an operative position for sewing a tape of an invisible zipper, and showing the needle in reference;
  • FIG. 2 is a side elevational view of the presser foot attachment of FIG. 1, showing the presser foot attachment in an elevated position, and the needle assembly in reference;
  • FIG. 3 is a view like FIG. 2, but showing the presser foot attachment lowered into pressing contact with a fabric article;
  • FIG.'4 is a view like FIGS. 2 and 3, but showing the foot component deflected upwardly by an increased thickness area of the fabric article;
  • FIG. 5 is a view like FIGS. 24, showing the increased thickness area repositioned to the rear of the foot component;
  • FIG. 6 is a bottom plan view of the foot component
  • FIG. 7 is a pictorial view of a modified form of foot component, taken from the same aspect as FIG. 1;
  • FIG. 8 is a front elevation view of the foot of FIG. 7 being used to install a zipper tape.
  • FIG. 9 is a bottom plan view of the foot shown by FIGS. 7 and 8.
  • the first illustrated embodiment of presser foot attachment comprises a mounting shank l0 and a foot component 12.
  • the mounting shank 10 may be like anyone of the mounting shanks disclosed by the aforementioned US. Pat. No. 3,342,151.
  • Foot component 12 includes a transverse slide bar 14 which fits in a transverse slideway 16 formed at the lower end of mounting shank 10.
  • the lower end portions of mounting shank 10 which define the slideway 16 function in the nature of a friction clamp.
  • the foot component 12 can be pushed sideways for the purpose of overcoming the friction and moving the foot component 12 in position relative to the mounting shank 10 and the needle N.
  • the foot component includes a heel portion 18 to which the slide bar 14 is attached, a toe portion 20, a reduced depth intermediate portion 22, and a sloping lower surface 24.
  • the foot component 12 is formed from a suitable structural plastic (e.g., delrin acetyl resin, manufactured by the DuPont Company).
  • the upper intermediate portion of the foot component 12 is recessed during manufacture to form the relatively shallow intermediate section 22 (e.g., about 40/ 1000 of an inch in thickness at y).
  • FIG. 2 shows the attitude of the foot component when it is attached to the mounting shank l0 and the presser bar (not shown) to which the mounting shank 10 is connected is raised.
  • the slide bar 14 and the upper surfaces of the foot component 12 are parallel to the upper surface 26 of the sewing machine.
  • the lower presser surface 24 of the foot component 12 is manufactured to extend at a relatively shallow acute angle x (e.g., 94) from both the sewing machine surface 26 and the upper surface of slide bar 14.
  • the first illustrated embodiment is a presser foot that is especially designed for installing an invisible or concealed zipper.
  • the foot component 12 includes four parallel guides. These consist of side guides 30, 32 and bottom guides 34, 36. Needle recesses 38, 40 are fonned in the side parts of the toe portion of foot component l2 and a needle receiving opening 42 is formed vertically through the toe portion 20 of the foot component 12.
  • the bottom guides 34, 36 are in the nature of parallel grooves formed in the lower forward portion of the foot component 12, on opposite sides of a downwardly projecting divider 44. The divider stops at the needle receiving opening 42.
  • the roof. area 46 behind the needle N is elevated so that it does not contact the upper surfaces of the zipper teeth 48.
  • the foot component 12 is open between the side parts of the reduced depth central portion 22.
  • the lower presser surfaces 24 of the foot component 12 slope downwardly from the heel 18 to the toe 20.
  • the toe portion 20 contacts the upper fabric member 50.
  • the depth of the heel portion 18 is such that when the presser bar is lowered the reduced depth section 22 will flex to place the lower presser surfaces 24 down flat against the upper pieceof fabric 50.
  • FIGS. 1 thepresser foot attachment is shown being used for sewing a zipper tape 50 onto a fabric member 52.
  • the zipper teeth 48 are secured to the zipper tape 50.
  • the zipper teeth 48 pass through guide avenues 34.
  • the needle N operates within the opening 42, closely adjacent the zipper teeth 48.
  • the presser surfaces 24 are substantially parallel to the sewing machine surface 26. However, they apply a larger pressure against the fabric members 50, 52 in the region of the needle N than they do rearwardly of such region, due to the heel-to-toe sloping nature of the presser surfaces 24. As previously mentioned, when the presser bar and mounting shank connected thereto are lowered, the reduced depth portions 22 of the foot component 12 flex an amount sufficient to lower the surfaces 24 generally flat against the upper fabric member 50.
  • the presser foot embodiment shown by FIGS. 7 9, as a second example of the invention, is also adapted for sewing zipper tapes onto a piece of fabric.
  • Only the foot component 60 is shown. It is mounted onto the presser bar of a sewing machine by a mounting shank like shank 10 in FIG. 1 or like any one of the mounting shanks disclosed by the aforementioned US. Pat. No. 3,342,151.
  • Foot component 60 includes a transverse slidebar 62 at its rear which is like slide bar 14. Slide bar 62 is secured to the upper portion of the foots heel 64. Forwardly of the heel 64 the foot component 60 is longitudinally slotted at 66 and 68, to divide the foot component 60 into three cantilever beam sections 70, 72, 74.
  • the footcomponent 60 is constructed to have a heel-to-toe downwardly sloping lower presser surface, the same as the embodiment shown by FIGS. 1 6. When attached to the presser bar, the foot component 60 would, in side elevation, occupy essentially the same attitude as foot 12 when in the various conditions depicted by FIGS. 2 5. Thus, side elevation views of foot component 60 are unnecessary and are not presented herein.
  • the side beams 70, 74 which provide the lower presser surfaces. It is the lower surfaces of these beams 70, 74 which preferably slope downwardly from theheel portion to the toe portion of the foot. As illustrated, these beam parts 70, 74 are of reduced thickness in comparison with the total depth of the foot component (such as measured between the top of beam section 72 and the level of the bottom surfaces of beam sections 70, 74).
  • the beam section 72 has an upper panel part 76 which is also of reduced thickness in comparison with such dimension of the foot component 60.
  • the central beam part 72 has a depending forward portion 78.
  • Portion 78 in the embodiment illustrated by FIGS. 7 9 is configured to provide guide avenues 80, 82 for the two chains of slide fastener elements of an invisible zipper. These avenues are formed on opposite sides of a divider 84.
  • the two sloping side walls of divider 84, the roof surfaces of front end member 78 on opposite sides of the divider 84, and the adjacent inside surfaces of the forward end or toe portions of beam members 70, 74 define the two guide avenues 80, 82.
  • a needle receiving aperture 86 corresponding to aperture 42 in the embodiment of FIGS. 1 6, is provided vertically through beam member 72 rearwardly of front portion 78.
  • Aperture 86 is flanked by two needle receiving recesses 88, 90, respectively formed in the two beam members 70, 74.
  • Recesses 88, 90 correspond to recesses 38, 40 in the embodiment of FIGS. 1 6.
  • the three beam members 70, 72, 74 will each flex independently of the others.
  • the side beams or 74 (74 in FIG. 8) which contacts the increased thickness of material (due to the presence of the zipper tape 50) must flex a greater amount than the opposite side beam 70, or 74 (70 in FIG. 8) which rests down upon the fabric member 52 to which the zipper tape 50 is being sewn.
  • both side beam members 70, 74 apply a downward presser on the material on both sides of the needle N,
  • the central beam member 72 is able to deflect upwardly if necessary in order to adjust itself to differing sizes of zipper teeth.
  • the contact made between this beam member 72 and the zipper teeth occurs only at the front end portion 78.
  • Rearwardly of front end portion 78 the roof of beam member 72 in the tunnel or passageway for the zipper teeth or slide fastener elements is elevated above the slide fastener elements so there is no frictional contact between the two.
  • the relatively small amount of friction which occurs between the front end portion 78 of beam member 72 and the slide fastener elements is not large enough to produce objectionable puckering or to impede the relative movement of the slide fastener elements through the zipper foot.
  • FIGS. 7 9 is also preferably constructed from structural plastic, and may be injection molded.
  • the guide avenues are designed to guide teeth of a given size. Then, if the foot encounters teeth of a slightly larger size, the teeth act in the same manner as a bulge and cause the foot to flex upwardly, raising the guide avenues so that they ride along the upper portions of the teeth. This of course results in an increase pressure between the zipper and the foot and hence some increased friction where contact is made.
  • the elimination of frictional contact behind the needle compensates for the increase in friction where the foot 12 contacts teeth forwardly of the needle. In other words, the increase in friction has been adequately compensated for by a decrease in the area of frictional contact.
  • a relatively thick and stiff heel portion connectable to the mounting shank, a relatively thick and stiff tow portion, a relatively thin and flexible interme diate portion spanning between said heel and toe portions, and a heel-to-toe downwardly sloping lower presser surface, with the dimensions of said foot component and the slope of said presser surface being such that when the foot is mounted onto the presser bar of a sewing machine, and such presser bar is lowered, the intermediate portion will bend upwardly and the presser surface will press generally flat onto the fabric being sewn, and when an increased thickness portion of the fabric passes under the toe portion said intermediate portion will flex an additional amount and the toe portion will rise upwardly, and when the increased thickness portion approaches the rear end of the presser surface it will move the presser bar upwardly against its spring and the toe portion will continue to make contact with the fabric because of the heel-to-toe sloping arrangement of the presser surface.
  • a presser foot component comprising:
  • a body including a heel portion by which the foot is mounted, a relatively thick and stiff toe portion, a relatively thin and flexible intermediate portion located inbetween said heel and toe portions, and a heel-to-toe downwardly sloping lower presser surface, with the dimensions of said foot component and the slope of said presser surface being such that when the foot is mounted onto the presser bar of a sewing machine, and such presser bar is lowered, the intermediate portion will bend upwardly and the presser surface will press generally flat onto the fabric being sewn, and when an increased thickness portion of the fabric passes under the toe portion said intermediate portion will flex an additional amount and the toe portion will rise upwardly, said foot portion including at least one bottom guide groove for receiving an invisible zipper chain, and said flexible intermediate portion comprising two laterally spaced apart side portions, with a space existing between said side portions through which the zipper chain passes.
  • a presser foot component connectable to said mounting shank, said component including a heel portion by which it is mounted, a relatively thick and stiff toe portion, a relatively thin and flexible intermediate portion located inbetween said heel and toe portions, and a heel-to-toe downwardly sloping lower presser surface, with the dimensions of said foot component and the slope of said presser surface being such that when the foot is mounted onto the presser bar of a sewing machine, and such presser bar is lowered, the intermediate portion will bend upwardly and the presser surface will press generally flat onto the fabric being sewn, and when an increased thickness portion of the fabric passes under the toe portion said intermediate por tion will flex an additional amount and the toe portion will rise upwardly, and when the increased thickness portion approaches the rear end of the presser surface it will move the presser bar upwardly against its spring and the toe portion will continue to make contact with the fabric because of the heel-to-toe sloping arrangement of the presser surface, said foot portion including at least one bottom guide groove for receiving an invisible zipper chain
  • a presser foot component comprising:
  • a body having a heel portion by which the foot component is mounted, said body being longitudinally slotted forwardly of said heel portion, to divide the body into at least two side beam parts and an intermediate beam part between said side parts, each of which parts extends forwardly from said heel portion in cantilever fashion;
  • each said beam parts being flexible so thatduring use each will independently flex in response to variations in thicknesses of an object below it;
  • each said beam part includes a toe portion
  • the intermediate beam part includes the said guide avcnue in its toe portion and includes a relatively thin elevated panel behind its toe portion, below which said zippcr chain space is defined.
  • the toe portion of said intermediate beam part includes a downwardly depending divider, providing a zipper chain guide avenue on each of its sides.
  • each zipper chain guide is laterally outwardly bounded by a toeportion of one of the side beam parts.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US455531A 1974-03-28 1974-03-28 Presser foot with flex feature Expired - Lifetime US3859939A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US455531A US3859939A (en) 1974-03-28 1974-03-28 Presser foot with flex feature
CA223,130A CA1026626A (en) 1974-03-28 1975-03-26 Presser foot with flex feature
GB12973/75A GB1507893A (en) 1974-03-28 1975-03-27 Presser foot for sewing machines
JP3737175A JPS5643755B2 (enrdf_load_stackoverflow) 1974-03-28 1975-03-27
AU79706/75A AU488516B2 (en) 1974-03-28 1975-04-01 Presser foot with flex feature
CA280,236A CA1029255A (en) 1974-03-28 1977-06-10 Presser foot with flex feature

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US455531A US3859939A (en) 1974-03-28 1974-03-28 Presser foot with flex feature

Publications (1)

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US3859939A true US3859939A (en) 1975-01-14

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Application Number Title Priority Date Filing Date
US455531A Expired - Lifetime US3859939A (en) 1974-03-28 1974-03-28 Presser foot with flex feature

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US (1) US3859939A (enrdf_load_stackoverflow)
JP (1) JPS5643755B2 (enrdf_load_stackoverflow)
CA (1) CA1026626A (enrdf_load_stackoverflow)
GB (1) GB1507893A (enrdf_load_stackoverflow)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3967567A (en) * 1975-03-07 1976-07-06 Wm. E. Wright Co. Unitary adaptor for presser foot attachment
USD243555S (en) 1974-08-30 1977-03-01 Drew Donald G Slide fastener presser foot
FR2375372A1 (fr) * 1976-12-21 1978-07-21 Yoshida Kogyo Kk Pied-de-biche pour fermeture a glissiere invisible
US4411211A (en) * 1980-10-25 1983-10-25 Optilon W. Erich Heilmann Gmbh Method of and apparatus for attaching slide fastener coupling chains to a flexible support
US4704781A (en) * 1985-08-03 1987-11-10 Opti Patent- Forschungs-Und Fabrikations-Ag Process and apparatus for mounting a slide fastener near opposing edges of two pieces of material
WO1996010348A1 (de) * 1994-10-01 1996-04-11 A. Raymond & Cie Verschlusselemente aus kunststoff zum annähen auf textilstoffen
USD450724S1 (en) 2000-11-17 2001-11-20 Kawaguchi Co., Ltd. Presser foot for concealed slide fasteners
USD515594S1 (en) * 2004-11-12 2006-02-21 Kawaguchi Co., Ltd. Presser foot for sewing machine
US7914296B1 (en) * 2010-01-05 2011-03-29 Exatron, Inc. Interconnecting assembly with conductive lever portions on a support film
CN102691180A (zh) * 2012-06-14 2012-09-26 吴江伊华丽丝绸时装有限公司 一种高度可调压脚
CN103750585A (zh) * 2014-01-21 2014-04-30 广东溢达纺织有限公司 车缝辅助夹具及装置
USD835686S1 (en) * 2017-09-22 2018-12-11 Clover Mfg. Co., Ltd. Presser foot with safety guard for sewing machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53120556U (enrdf_load_stackoverflow) * 1977-03-03 1978-09-26

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US601402A (en) * 1898-03-29 Presser-foot for sewing-machines
US3349736A (en) * 1965-10-22 1967-10-31 Robert B Howell Zipper foot attachments

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US601402A (en) * 1898-03-29 Presser-foot for sewing-machines
US3349736A (en) * 1965-10-22 1967-10-31 Robert B Howell Zipper foot attachments

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD243555S (en) 1974-08-30 1977-03-01 Drew Donald G Slide fastener presser foot
US3967567A (en) * 1975-03-07 1976-07-06 Wm. E. Wright Co. Unitary adaptor for presser foot attachment
FR2375372A1 (fr) * 1976-12-21 1978-07-21 Yoshida Kogyo Kk Pied-de-biche pour fermeture a glissiere invisible
US4411211A (en) * 1980-10-25 1983-10-25 Optilon W. Erich Heilmann Gmbh Method of and apparatus for attaching slide fastener coupling chains to a flexible support
US4704781A (en) * 1985-08-03 1987-11-10 Opti Patent- Forschungs-Und Fabrikations-Ag Process and apparatus for mounting a slide fastener near opposing edges of two pieces of material
WO1996010348A1 (de) * 1994-10-01 1996-04-11 A. Raymond & Cie Verschlusselemente aus kunststoff zum annähen auf textilstoffen
USD450724S1 (en) 2000-11-17 2001-11-20 Kawaguchi Co., Ltd. Presser foot for concealed slide fasteners
USD515594S1 (en) * 2004-11-12 2006-02-21 Kawaguchi Co., Ltd. Presser foot for sewing machine
US7914296B1 (en) * 2010-01-05 2011-03-29 Exatron, Inc. Interconnecting assembly with conductive lever portions on a support film
CN102691180A (zh) * 2012-06-14 2012-09-26 吴江伊华丽丝绸时装有限公司 一种高度可调压脚
CN103750585A (zh) * 2014-01-21 2014-04-30 广东溢达纺织有限公司 车缝辅助夹具及装置
USD835686S1 (en) * 2017-09-22 2018-12-11 Clover Mfg. Co., Ltd. Presser foot with safety guard for sewing machine

Also Published As

Publication number Publication date
AU7970675A (en) 1976-10-07
JPS5643755B2 (enrdf_load_stackoverflow) 1981-10-14
CA1026626A (en) 1978-02-21
GB1507893A (en) 1978-04-19
JPS50136137A (enrdf_load_stackoverflow) 1975-10-29

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