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US3863580A - Low-inertia presserfoot for sewing machines - Google Patents

Low-inertia presserfoot for sewing machines Download PDF

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Publication number
US3863580A
US3863580A US343987A US34398773A US3863580A US 3863580 A US3863580 A US 3863580A US 343987 A US343987 A US 343987A US 34398773 A US34398773 A US 34398773A US 3863580 A US3863580 A US 3863580A
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US
United States
Prior art keywords
presser
foot
foot bar
feed dog
biasing means
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
US343987A
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English (en)
Inventor
Nerino Marforio
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.)
Virginio Rimoldi and Co SpA
Original Assignee
Virginio Rimoldi and Co SpA
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 Virginio Rimoldi and Co SpA filed Critical Virginio Rimoldi and Co SpA
Application granted granted Critical
Publication of US3863580A publication Critical patent/US3863580A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B29/00—Pressers; Presser feet
    • D05B29/02—Presser-control devices

Definitions

  • ABSTRACT Forelgn Application Pnomy Data A sewing machine presser mechanism is disclosed hav- Apr. 13, 1972 Italy 23075/72 ing a low inertia pressepfoot Which is automatically driven through its cooperation with the feed dog in [52 U.S. Cl. 112/212, 112/235 Order to effect the feeding of the uppermost ply f 51] Ir
  • the present invention refers to a low-inertia presserfoot device for sewing machines including a presserfoot having a sole portion with a fulcrum point on an oscillating support, the latter being hinged to the presserfoot bar which is biased downwardly by independent biasing means against the feed dog of the feeding device and therefore against the needle plate.
  • Presser-feet constructed in the mentioned way are well known and their use has been in great demand to obtain a desired forward movement of the work in view of the difficulty experienced with synthetic fabrics by the making up industry.
  • the resser-foot has been fitted with independent biasing means which is lighter than the normal fabric pressing spring and functions to assure contact of the sole portion of the presserfoot with the feed dog during the time that it protrudes through the needle plate and to cause it to follow an arcuated path which at the end of its cycle is moving in the same direction of the forward movement of the workpiece and is effective in serving as an upper feeding device that assists in advancing said workpiece.
  • the independent biasing means is capable of absorbing the thrust exerted by the feed dog when it protrudes from the needle plate and continuously maintains contact of the sole portion of the presser-foot with the feed dog unchanged during the entire portion of the work feeding cycle and for as long as it protrudes from the needle plate.
  • the independent biasing means must be adjustable so that the presser-foot will exert a pressure proportionate to the thickness of the work, not so much in order to increase or diminish it as the thickness of the work changes but to keep it constant for the variations in workpiece thicknesses.
  • the uniformity of the pressure is necessary not to offer an excessive resistance to the vertical movements of the feed dog but to make the independent biasing means sensitive in order to fully exploit the oscillation of the feed dog and maintain the sole ofthe presser-foot in contact with it so that the layers forming the work to be sewn by the machine will maintain alignment one with the other.
  • the area around the presser-foot has to be kept as clear as possible so as to provide necessary clearance for changeover to other attachments required by the machine.
  • the independent biasing means must be disposed so that it is readily accessible and will not interfere with the normal working and maintenance of the machine.
  • the device must also be easily removable to provide for rapid assembly of other devices to the machine.
  • the aim of the present invention is that of making the assembly of the presser-foot simplified so that adjustment, when necessary does not involve any diffculty and at the same time provides for its easy removal from the machine.
  • the problem solved was the construction of the independent biasing means and its location on the machine so that its point of application on the presser-foot does not cause interference with other supplementary devices.
  • a low-inertia presser-foot having independent biasing means is supported by a presser-foot bar from which and beneath which it protrudes and is operatively connected to the upper end of an oscillating support of the presser-t'oot and includes means for the selective adjustment of the pressure exerted by the biasing means on the said support.
  • the presserfoot bar is provided with an internal recess adapted to receive the independent biasing means and object of the invention is to provide an improved presserfoot device for a sewing machine of simplified construction, having a minimum of parts and which require a minimum amount of space to perform its intended function without interference with other attachments required by the machine.
  • a further and more specific object of the invention is to provide an improved presser-foot device for a sewing machine which can be quickly and easily attached to or detached from the machine without changing the settings of the presser-foot bar and the biasing means carried thereby to which the presser-foot is operatively connected.
  • FIG. 1 is a view in side elevation and in partial section of a portion of a sewing machine showing the presserfoot device according to the invention applied thereto.
  • FIG. 2 is a sectional view of the device in FIG. 1 as seen looking in the direction of the indicating arrows of line IIII in FIG. I, and
  • FIG. 3 is a perspective view in exploded form showing the presserfoot device in greater detail.
  • the presser-foot device generally indicated by numeral 10 includes a presser-foot bar 11 which is mounted for sliding movement in a supporting bushing 12 assembled in and which protrudes from the underside of that portion of a sewing machines frame identified in FIGS. 1 and 2 by numeral 13.
  • the presserfoot bar 11 carries on the lower end thereof a presserfoot l4 and on its upper portion the usual fabric pressing spring 15.
  • One end of spring 15 engages an upper end 16 of the presser-foot bar and the other end is housed in an adjustment bushing 17 as shown in FIG. 2 on the upper portion of the frame 13 in vertical alignment with bushing 12.
  • This bar 11 is connected to a conventional lifting device 18 which includes, among other parts, a collar 19 fixed on the upper end 16 of the said presser-foot bar and is connected by means of a screw 20 to a tie rod 21.
  • the rod 21 is pivotally attached to the free end of a lifting arm 22 which is keyed on one end of a driving shaft 23 of the lifting device.
  • the tie rod 21 is provided adjacent its lower end with an elongated hole 24 through which the screw 20 extends and permits vertical movement of the presser-foot bar 11 during normal operation of the machine within the limits of the elongated slot.
  • the presser-foot bar 11 is normally urged downwardly by spring 15 so that the screw is located in the lower portion of the elongated hole 24 as shown in FIG. 1.
  • the presser-foot device 14 (FIG. 3) includes a support clamp 25 fixed on the presser-foot bar 11 by means of set screws 26.
  • An oscillating support 27 of generally V-shape configuration of which one of the arms thereof is disposed above the other, and forms a pivoting head 28.
  • the other arm is directed angularly downward and pivotally supports a sole plate 29 at its lower end (FIGS. 1 and 3).
  • a coil spring 30 (FIG. 3) disposed so as to urge the free end of said sole plate 29 upwardly when the presser-foot is not in contact with the workpiece below it.
  • the pivoting head 28 of the oscillating support 27 is pivotally attached to the clamp 25 intermediate a pair of spaced and integrally formed ears 31 depending therefrom by means ofa pin 32.
  • the pivoting head 28 has on its rearward side a slot 33 into which assembles a roller 34 that is adapted to make contact with the independent biasing means 35 for continuously urging the oscillating support 27 and the sole 29 of the presser-foot device 10 in a downwardly direction (FIG. 2).
  • the biasing means 35 is housed in a longitudinal recess 36 provided on the inside of the presser-foot bar 11 and includes a first pushrod 37 slidably mounted therein and which protrudes from the lower end of said bar.
  • a helical spring 38 assembles on the first push rod 37 with one end in contact with a collar 39 fixed on the latter and the opposite end presses against a second push-rod 40 which is threadably assembled in the upper portion 16 of the said presser-foot bar 11.
  • the first push-rod 37 is adapted to transmit the pressure exerted by the spring 38 to the oscillating support 27 with which said rod is operatively associated by means of the roller 34.
  • the second pushrod is adjustable longitudinally to increase or decrease the pressure provided by a biasing means such as a coil spring 38 by simply turning said push-rod in one direction or the other.
  • a biasing means such as a coil spring 38 by simply turning said push-rod in one direction or the other.
  • the second push-rod 40 includes an upwardly directed tang 41 which extends into an axially aligned bore 42 formed in the adjustment bushing 17 and is readily assessable through the top of said bushing with a screw driver or the like to turn said second push rod as desired.
  • the independent biasing means 35 is housed by the presser-foot bar 11 to provide an improved compact device which will not create an interference in the area of the presser-foot where other auxilliary devices are normally mounted, such for example as the upper thread cutting device, the separation knife or the auxiliary work puller device.
  • a further advantage of confining the independent biasing means as described above is to keep the area above the frame 13 free of interference so that the bushing 17 can be easily adjusted.
  • the arrangement of the elements comprising the independent biasing means permits the device to be quickly and easily removed from the machine as a unit.
  • presser-foot is blocked during its downward movement, that is to say that the presser-foot bar does not descend as rapidly as the feed dog 43 so that only the pressure exerted by the independent biasing means 35 operates on the presser-foot to oppose the thrust of the feed dog.
  • the fabric pressing spring 15 is utilized, in this case, for the purpose of maintaining the presser-foot bar 11 in its desired location for combating those eventual greater thicknesses in the workpieces, such as cuffs or flaps, crossed seams, etc. which, because of their size, cause the support 27 to move upwardly while sewing the same.
  • the clamp 25 is provided with an integral plate 45, which is angularly disposed and on which two stop screws 46 and 47 having lock nuts 48 are assembled.
  • the presser-foot bar includes a shoulder 50 (FIG. 2) which serves to retain the first push rod 37 within said presser-foot bar by causing collar 39 to seat on said shoulder when for any number of reasons the presserfoot 14 is removed from the machine.
  • the pressure exerted by the spring 38 of the biasing means 35 is less than the pressure exerted by the fabric pressing spring 15; however, it is sufficient to perform the function of absorbing the thrust of the feed dog and to return the absorbed energy as the feed dog descends which is required to obtain the necessary forward movement of the layer of fabric forming the workpiece.
  • an improved low inertia presser-foot device comprising:
  • a presser-foot bar having an axial bore extending therethrough
  • support means including 1. a clamp member attached to one end of said presser-foot bar.
  • an oscillatable support having a bifurcated pivoting head pivotably connected to said clamp member with said sole plate being pivotably attached to the other end of said oscillatable support, and
  • independent biasing means carried by said pressure-foot bar and operatively connected to said roller member for urging the sole plate toward the feed dog;
  • a fabric pressing spring with tension control means connected to said presser-foot bar for continuously urging the latter and the supporting means carried thereon under selected tension in a direction to effect contact of the sole plate with the workpiece as it is advanced by the feed dog.
  • said independent biasing means includes a spring biased first push rod housed in the axial bore of said presser-foot bar having one end thereof protruding from the lower end of the latter for operative contact with said roller member.
  • said independent biasing means includes a second push rod having one end assembled for longitudinal adjustment within the axial bore of the upper end of said presser-foot bar for selectively changing the amount of force exerted by said spring biased first push rod on said roller member.
  • presser-foot bar includes an internal shoulder for limiting the downward movement of said spring biased first push rod to prevent its removal from said presser-foot bar upon disassembly of said presser-foot device from the latter.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US343987A 1972-04-13 1973-03-22 Low-inertia presserfoot for sewing machines Expired - Lifetime US3863580A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT23075/72A IT951356B (it) 1972-04-13 1972-04-13 Dispositivo premistoffa a bassa inerzia per macchine per cucire

Publications (1)

Publication Number Publication Date
US3863580A true US3863580A (en) 1975-02-04

Family

ID=11203502

Family Applications (1)

Application Number Title Priority Date Filing Date
US343987A Expired - Lifetime US3863580A (en) 1972-04-13 1973-03-22 Low-inertia presserfoot for sewing machines

Country Status (5)

Country Link
US (1) US3863580A (it)
JP (1) JPS5728596B2 (it)
DE (1) DE2317976B2 (it)
ES (1) ES413601A1 (it)
IT (1) IT951356B (it)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4058071A (en) * 1976-12-22 1977-11-15 The Singer Company Sewing machine presser bar mechanism
US4269128A (en) * 1979-01-10 1981-05-26 Union Special Corporation Low inertia tandemly mounted presser mechanism
DE3217826A1 (de) * 1981-05-14 1982-12-02 The Singer Co., 06904 Stamford, Conn. Stoffdrueckerstange fuer naehmaschine
FR2506799A1 (fr) * 1981-06-02 1982-12-03 Rockwell Rimoldi Spa Commande de pied-de-biche pour machines a coudre
US20090020056A1 (en) * 2007-07-17 2009-01-22 Juki Corporation Cloth presser device of sewing machine
US20230416960A1 (en) * 2022-06-28 2023-12-28 Brother Kogyo Kabushiki Kaisha Sewing machine provided with adjusting mechanism adjusting pressing force applied to workpiece

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3724787A1 (de) * 1987-07-27 1989-02-16 Pfaff Ind Masch Naehmaschine mit einer obertransporteinrichtung

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2161141A (en) * 1938-03-18 1939-06-06 Singer Mfg Co Presser mechanism for sewing machines
US2280193A (en) * 1939-07-21 1942-04-21 Union Special Machine Co Quick action presser foot
US2344414A (en) * 1942-11-14 1944-03-14 Singer Mfg Co Presser mechanism for sewing machines
US2616382A (en) * 1950-05-04 1952-11-04 Singer Mfg Co Low inertia presser-mechanism for sewing machines
US3294047A (en) * 1965-04-14 1966-12-27 Singer Co Regulated presser mechanisms for sewing machines
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
US3757714A (en) * 1971-06-19 1973-09-11 Pfaff Gmbh Upper transport device for sewing machines

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2161141A (en) * 1938-03-18 1939-06-06 Singer Mfg Co Presser mechanism for sewing machines
US2280193A (en) * 1939-07-21 1942-04-21 Union Special Machine Co Quick action presser foot
US2344414A (en) * 1942-11-14 1944-03-14 Singer Mfg Co Presser mechanism for sewing machines
US2616382A (en) * 1950-05-04 1952-11-04 Singer Mfg Co Low inertia presser-mechanism for sewing machines
US3294047A (en) * 1965-04-14 1966-12-27 Singer Co Regulated presser mechanisms for sewing machines
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
US3757714A (en) * 1971-06-19 1973-09-11 Pfaff Gmbh Upper transport device for sewing machines

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4058071A (en) * 1976-12-22 1977-11-15 The Singer Company Sewing machine presser bar mechanism
US4269128A (en) * 1979-01-10 1981-05-26 Union Special Corporation Low inertia tandemly mounted presser mechanism
DE3217826A1 (de) * 1981-05-14 1982-12-02 The Singer Co., 06904 Stamford, Conn. Stoffdrueckerstange fuer naehmaschine
FR2506799A1 (fr) * 1981-06-02 1982-12-03 Rockwell Rimoldi Spa Commande de pied-de-biche pour machines a coudre
US20090020056A1 (en) * 2007-07-17 2009-01-22 Juki Corporation Cloth presser device of sewing machine
US20230416960A1 (en) * 2022-06-28 2023-12-28 Brother Kogyo Kabushiki Kaisha Sewing machine provided with adjusting mechanism adjusting pressing force applied to workpiece
US12215450B2 (en) * 2022-06-28 2025-02-04 Brother Kogyo Kabushiki Kaisha Sewing machine provided with adjusting mechanism adjusting pressing force applied to workpiece

Also Published As

Publication number Publication date
JPS499350A (it) 1974-01-26
IT951356B (it) 1973-06-30
JPS5728596B2 (it) 1982-06-17
ES413601A1 (es) 1976-01-01
DE2317976A1 (de) 1973-10-25
DE2317976B2 (de) 1979-11-08

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