US2541888A - Speed-responsive presser device for sewing machines - Google Patents

Speed-responsive presser device for sewing machines Download PDF

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Publication number
US2541888A
US2541888A US19063A US1906348A US2541888A US 2541888 A US2541888 A US 2541888A US 19063 A US19063 A US 19063A US 1906348 A US1906348 A US 1906348A US 2541888 A US2541888 A US 2541888A
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US
United States
Prior art keywords
presser
speed
shaft
spring
work
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
US19063A
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English (en)
Inventor
Berthold P Pinkvoss
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.)
Singer Co
Original Assignee
Singer Co
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 Singer Co filed Critical Singer Co
Priority to US19063A priority Critical patent/US2541888A/en
Priority to GB21160/48A priority patent/GB639515A/en
Priority to CH272215D priority patent/CH272215A/de
Priority to FR973373D priority patent/FR973373A/fr
Priority to AT171048D priority patent/AT171048B/de
Priority to DEP30242A priority patent/DE822190C/de
Application granted granted Critical
Publication of US2541888A publication Critical patent/US2541888A/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
    • D05B29/00—Pressers; Presser feet
    • D05B29/02—Presser-control devices

Definitions

  • presser mechanisms of this q nature it is common practice to give to one presserioot, frequently ,called the 'walking 1foot, work-engaging and work-releasing move- ;ments and feed-and-return movements in synlchronism with the similar movements of a fourmotioned ted-dog which engages the under side pf the work, whereby the work is-gripped between the two eeding eleIn-entsand positively advanced.
  • the -non-feeding presser-foot is caused to bear .u-pon-the work,--to holdthe work stationary on the throat-plate while the feeding pregsser-foot is titted, and to be raised above the work by the pressure of the feeding foot on the work.
  • the two presser feet alternately engage and re- ;lease the work.
  • One .or more springs are .com-
  • This invention has as a primary objectv to overcome the defects and undesirable features of prior constructions of this nature.
  • Another object 'of- .the invention is to provide an alternating presser m chanism which will securely hold the work on the throat-plate, be-
  • the invention comprises the devices, combinations and arrangcmentsof parts hereinafter set forth and illustrated in the accompanying drawings of a preferred embodiment of the invention, from which the .SEVQraI features vof the invention and the advantages attained thereby will be readily understood by those skillld in the art.
  • Fig. 1 is a side elevation, partly broken away and partly in section, .of a sewing machine embodying the present invention; the machine b.6- ingillustrated as at rest.
  • Fig. 2 is -a left .end .elevation, partly broken away, of the machine illustrated in Fig. 1. o
  • Fig. 3 is an enlarged sectional View of the midportion of Fig. l with certainof the parts in the positions they assume under high speed operation.
  • Fig. 4 is an enlarged transverse sectional view taken substantially .on the line 5-4 of Fig. .1.
  • Fig. 5 is an enlarged transverse sectional view taken ,substantially on the line 5-5 of Fig. ,L
  • Fig. 6 is a detail sectional view, taken on the line .6 ii of Fig. 2, showing the means for .ponfnecting the pr.sser spring with the alternating presser mechanism.
  • the invention is disclosed as embodied in asew- I9 of a three-armed lever l9.
  • j I! and the feeding presser-foot carried thereby ing machine comprising a frame including a work-supporting plate i, a standard 2 secured to and rising from the plate I.
  • Formed integrally with the standard is an overhanging bracketarm 3 which terminates, at its free end, in a bracket-arm h ad 4, journaled lengthwise within the bracket-arm is a main or needle-bar driving shaft 5 which carries, at its rear end, a combined belt and hand wheel 6 having a belt groove 1 adapted to receive a driving belt (not shown), by means of which the shaft may be driven from any suitable source of power.
  • a needle-bar l carrying, at its lower end, a thread-carrying eye-pointed needle H adapted to cooperate with a suitable loop-taker (not shown) in the formation of stitches.
  • the needle-bar is reciprocated from a crank-disk l2, secured on the shaft 5, by conventional means de- ,signated generally as at.
  • the machine is also provided with an alternating presser mechanism including a presser-bar l3, mounted for vertical reciprocation in the bracket-arm head 4, and carrying at its lower end a non-feeding presser-foot l4 adapted to 'hold the work on the usual throat-plate l carried by the work-supportng plate I.
  • a presser-bar l3 mounted for vertical reciprocation in the bracket-arm head 4
  • a non-feeding presser-foot l4 adapted to 'hold the work on the usual throat-plate l carried by the work-supportng plate I.
  • Cooperating with the presser-foot I4 is a combined presserand work-feeding-foot l6 which cooperates with the feed-dog f of a conventional four-motioned work-feeding mechanism.
  • the foot I6 is secured upon the lower end of a feed-bar I1 the upper end of which is fulcrumed, at l8, to one arm
  • the feed-bar are given rising-and-fall ng and feed-and-return movements from eccentrics 20 and 2
  • the eccentric 20 is surrounded by the strap end 22 of adown- .wardly and rearwardly inclined pitman 22 the other end of which is pivotally connected to the i upper free end of a feedift rock arm 23 clamped .upon a sleeve 24 journaled at one end in the bracket-arm head 4 and at its other end in a bracket 25 secured to and depending from the under side of the bracket-arm 3.
  • the outer end of the sleeve 24 carr es an upright arm 26 which is connected, by a link 21, to the upstanding arm I9 of the three-armed lever l9.
  • the third arm [9, of the lever I9, is connected by an anchor link 2'! to a pin 28 secured in the bracket-arm head 4.
  • a vertically disposed link 29 is pivotally connected, by the stud 30 with the third arm l9 of the lever l9. with a collar 3
  • downwardly and rearwardly inclined pitman 33 has its upper strap end surrounding the eccentric 2
  • the feed-drive rock-shaft 35 has secured to it the hub end of a depending feed-drive rock-arm 36, the lower end of which ispivotally connected, at 31, to one end of a link 38 the other end of which is pivotally conthis nature, rocking of the three-armed lever I9 clockwise as seen in Fig. 2, depresses the foot l6 into contact with the work.
  • the lever I9 is oscillated in the opposite direction thereby depressing the foot l4 upon the work and lifting the feeding foot Hi to permit it to be returned to its forward position.
  • the presser-feet l4 and 16 are normally depressed upon the work by a leaf spring 40, supported at its rear end on a bracket 4! secured to the under side of the bracket-arm 3, as shown most c'early in Fig. 5.
  • the forward end of the spring 40 extends into the bracket-arm head 4 and is connected, by a bolt 42, (see Fig. 6) with a stud 43 carried by the three-armed lever l9, which, as hereinbefore explained is connected with both the presser-bar l3 and the feed-bar I'l.
  • the spring 49 is engaged .by a shoe 44 which is pressed downwardly, to tension the spring 40. by its engagement with the lower unthreaded end 45 of a screw stud 45.
  • This stud is threaded nto a bushing 46, which, in turn, is threaded into the lower wall of the bracket-arm 3.
  • the upper end of the stud is provided with a screw driver slot whereby the stud may be rotated to adjust it axially, thereby to shift the shoe 44 vertica ly to vary the downward pressure exerted by the spring 40 on the presser-bars. This pressure will remain constant for any given adiustment of the stud 45.
  • the stud 45 will be adjusted to produce a downward pressure onthe presser-feet which is most suitable for relatively slow speed operation of the sewing machine.
  • Th s means comprises an auxiilary spring device which acts in conjunction with the main spring device 40 to increase the spring pressure as the speed of the machine is increased.
  • the auxiliary spring device includes a lever 41 preferably, but not necessarily, in the form of a second leaf spring located between thespring 40 and the bracketarm 3. The forward end portion of the spring extends into the bracket-arm head 4 and bears u on the spring 40, as shown most clearly in Fig. l.
  • the rear end of the lever 41 is bifurcated, and straddles the inverted T-shaped lower end 48 of a twisted link 48, the upper end of which is pivotally connected at 49 to one arm 50 of a bell-crank lever 50, journaled on a stud 5
  • the spring lever 41 is in contact with the lower emi or thebushing 46; hereir'ibefore' mention-ea worth ness: certain 1 conditions, serves": as a; fulfortfl springifli ThisbuShiligiS so located arranged that a in: the lowermost position of lime-48; as shciwninFig'.
  • the spring 41 is substantially tension-free and therefore transmits littleinifany; pres-sure to the spring Amupper" ar'm -50 ofthebell-crank lever 50 has a rheadmortion 50 located'between andengaging anannularflange-52 forming apart of 'a-sleeve l SWslidinglymounted onthe shaft 5; and a-thrust bear ng 53 mounted on: thesleeve 52.
  • pivot pins 58, 59 angle levers 6
  • doil spring 66 for a limited range of f relatively slow speeds, the bushing 46 1s adiusted the posit on inustfatedm Fig; 5'.
  • the extent to which the weights: 63 will be swungv outwardly andtherefore:the-amountv of pressure which the spring lever: 41 will transmit to the leaf spring. 40 will be proportional to the speed of rotation of the main shaft 5'.- Under maximum speed of rotation of the: main shaft the weights 63, 64 and levers 60, 61 will. assume the positions shown in Fig 3;
  • presser-feet downward pressure in amount required to effect the most efficient operation thereof under. all speeds of. operation of the sewing machine, from slow speed to maximum speed.
  • a sewing machine in combination a frame; a variable speed rotary shaft journaled in'said frame;- a presser mechanism supported by the frame; *a' lever fulcrumed intermediate its ends on said frame, one end of said lever being connected with said presser mechanism;- and speed responsive means-connected to the other end of said lever and actuated by said shaft-for turning said-lever about its fulcrum tocause it to transmit downward pressure on said presser mechanism in proportion to thexspeed of rotation ofsaidshafti 4';
  • a variable speed rotary shaft; a presser-foot; spring means exerting a downward pressure onsaid press'er-foot; and auxiliary means actuated by said shaft- - and responsive to variations in the speed thereof forlamplifying the pressure exerted by -said-spring m-eans'in direct proportiontothe 7 proportion to the increase in speed of said rotary shaft.
  • a rotary shaft in combination, a rotary shaft; an alternating presser mechanism including a first presser-foot having vertical movements only and a second presser-foot having vertical movements and horizontal feed and return movements; spring means normally transmitting to said presser mechanism a predetermined downward pressure; and auxiliary means actuated by said shaft and rendered effective when the speed of rotation of said shaft reaches a predetermined rate for amplifying the pressure transmitted to said presser mechanism by said sprin means.
  • a variable, speed rotary shaft in combination, a variable, speed rotary shaft; an alternating presser mechanism including a first presser-foot having vertical movements only and a second presserfoot having vertical movements and horizontal feed and return movements; spring means normally transmitting to said presser mechanism a predetermined downward pressure; and auxiliary means actuated by said shaft and rendered effective when the speed of rotation of said shaft reaches a predetermined rate for variably amplifying the pressure transmitted to said presser mechanism by said spring means in proportion to increases in the speed of rotation of said shaft.
  • a variable speed rotary shaft in combination, a variable speed rotary shaft; an alternating presser mechanism including a first presser-foot havin vertical movements only and a second presserfoot having vertical movements and horizontal feed and return movements; sprin means normally transmitting to said presser mechanism a predetermined downward pressure; and auxiliary means actuated by said shaft when the shaft has attained a predetermined speed of rotation for amplifying the pressure transmitted to said presser mechanism by said sprin means.
  • a variable speed rotary shaft in a combination, a variable speed rotary shaft; a presser mechanism; means exerting a substantially constant downward pressure on said presser mechanism; a pair of speed-responsive elements carried by said shaft; and means actuated by said speedresponsive elements for transmitting to said presser mechanism additional downward pressure in amounts proportional to the speed of rotation of said shaft.
  • a variable speed rotary shaft in combination, a variable speed rotary shaft; a presser mechanism; spring means exerting a substantially constant downward pressure on said presser mechanism; a pair of bell-crank levers carried by and rotatable with said shaft; a weight carried by one arm of each of said levers, said levers being arranged to be swung about their fulcrums by the centrifugal force exerted by said weights; and means actuated by the other arms of said levers for transmitting to said presser mechanism additional downward pressure in amounts proportional to the speed of rotation of said shaft.
  • a variable speed rotary shaft in combination; a variable speed rotary shaft; a presser mechanism; spring means exerting a substantially constant downward pressure on said presser mechanism; a pair of speed-responsive elements carried by said shaft; a sleeve slidingly mounted on said shaft; means actuated by said speed-responsive elements for shifting said sleeve axially of said shaft; and means actuated by the sliding movement of said sleeve for transmitting to said presser mechanism additional downward pressure in amounts proportional to the speed of rotation of said shaft.
  • a. frame a variable speed rotary shaft; a presser mechani m; means exerting a substantially constant downward pressure on said presser mechanism; a collar fixed to said shaft; a pair of speedresponsi e elements carried by said collar;'a lever fulcrumed on said frame; a member slidingly mounted on said shaft and engaging said lever; means actuat d by said speed-responsive elements for shifting said member lengthwise of said shaft to turn said lever about its fulcrum; and means actuated by the turning movement of said lever for ex rt ng additional downward'pressu e on said esser mechanism in amounts proportional to the speed of rotation of said shaft.
  • a frame in combination, a frame; a variab e speed rotary shaft; a presser mechanism; means exerting a substantially constant downward pressure on said presser mechanism; a collar fixed to said shaft; a pair of speedres'ponsive elements carried by said collar; alever fulcrumed on said frame; a member slidingly mounted on said shaft and engaging said lever; means actuated by said speed-responsive elements for shifting said member lengthwise of said shaft to turn said lever about its fulcrum; a spring acting on said member to prevent its bein shifted by said speed responsive elements until a predetermined speed of rotation of said shaft has been attained; and means actuated by the turning movement of said lever for exerting additional downward pressure on said presser mechanism in amounts proportional to the speed of rotation of said shaft.
  • a frame including a bracket-arm; an abutment supported by said bracket-arm; a variable speed rotary shaft journaled in said frame; a presser mechanism mounted for vertical movement relative to said frame; means exerting a substantially constant downward pressure on said presser mechanism; a spring arm extending lengthwise of said bracket-arm and bearing intermediate its ends on said abutment, said spring-arm having one end thereof connected with said presser mechanism; a speed-responsive device carried by said shaft; and means actuated by said speedresponsive device and connected with the other end of said spring arm to cause the forward.v end asrnarinons CITED
  • the following references are of record in the file of this patent:

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US19063A 1948-04-05 1948-04-05 Speed-responsive presser device for sewing machines Expired - Lifetime US2541888A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US19063A US2541888A (en) 1948-04-05 1948-04-05 Speed-responsive presser device for sewing machines
GB21160/48A GB639515A (en) 1948-04-05 1948-08-11 Speed-responsive presser devices for sewing machines
CH272215D CH272215A (de) 1948-04-05 1948-09-06 Stoffdrückervorrichtung an Nähmaschinen.
FR973373D FR973373A (fr) 1948-04-05 1948-10-08 Dispositif presseur pour machines à coudre
AT171048D AT171048B (de) 1948-04-05 1948-10-25 Drückervorrichtung an Nähmaschinen
DEP30242A DE822190C (de) 1948-04-05 1949-01-01 Drueckervorrichtung fuer Naehmaschinen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US19063A US2541888A (en) 1948-04-05 1948-04-05 Speed-responsive presser device for sewing machines

Publications (1)

Publication Number Publication Date
US2541888A true US2541888A (en) 1951-02-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
US19063A Expired - Lifetime US2541888A (en) 1948-04-05 1948-04-05 Speed-responsive presser device for sewing machines

Country Status (6)

Country Link
US (1) US2541888A (de)
AT (1) AT171048B (de)
CH (1) CH272215A (de)
DE (1) DE822190C (de)
FR (1) FR973373A (de)
GB (1) GB639515A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2750908A (en) * 1952-10-03 1956-06-19 Singer Mfg Co Fluid pressure actuated mechanisms for sewing machines
US2876722A (en) * 1954-12-20 1959-03-10 Singer Mfg Co Blind stitch sewing machines
DE3118726A1 (de) * 1980-05-13 1982-02-18 Brother Kogyo K.K., Nagoya, Aichi Naehmaschine
US4981094A (en) * 1988-06-09 1991-01-01 Durkoppwerke Gmbh Sewing machine having a device actuable by a pressure medium for applying a variable force to a presser element
EP2058426A1 (de) * 2007-11-07 2009-05-13 Dürkopp Adler AG Nähmaschine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1221085B (de) * 1961-02-01 1966-07-14 Singer Co Naehmaschine mit kombiniertem Nadel- und Obertransport

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US681684A (en) * 1901-01-10 1901-09-03 Singer Mfg Co Alternating pressers for sewing-machines.
US1202224A (en) * 1915-05-11 1916-10-24 Singer Mfg Co Cloth-presser mechanism for sewing-machines.
US2174290A (en) * 1937-04-13 1939-09-26 Singer Mfg Co Presser device for sewing machines

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US681684A (en) * 1901-01-10 1901-09-03 Singer Mfg Co Alternating pressers for sewing-machines.
US1202224A (en) * 1915-05-11 1916-10-24 Singer Mfg Co Cloth-presser mechanism for sewing-machines.
US2174290A (en) * 1937-04-13 1939-09-26 Singer Mfg Co Presser device for sewing machines

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2750908A (en) * 1952-10-03 1956-06-19 Singer Mfg Co Fluid pressure actuated mechanisms for sewing machines
US2876722A (en) * 1954-12-20 1959-03-10 Singer Mfg Co Blind stitch sewing machines
DE3118726A1 (de) * 1980-05-13 1982-02-18 Brother Kogyo K.K., Nagoya, Aichi Naehmaschine
US4381722A (en) * 1980-05-13 1983-05-03 Brother Kogyo Kabushiki Kaisha Sewing machine
US4981094A (en) * 1988-06-09 1991-01-01 Durkoppwerke Gmbh Sewing machine having a device actuable by a pressure medium for applying a variable force to a presser element
EP2058426A1 (de) * 2007-11-07 2009-05-13 Dürkopp Adler AG Nähmaschine

Also Published As

Publication number Publication date
GB639515A (en) 1950-06-28
AT171048B (de) 1952-04-25
DE822190C (de) 1951-11-22
CH272215A (de) 1950-12-15
FR973373A (fr) 1951-02-09

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