US3022756A - Mechanism for adjusting the length of stitch on a sewing machine - Google Patents

Mechanism for adjusting the length of stitch on a sewing machine Download PDF

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Publication number
US3022756A
US3022756A US4671A US467160A US3022756A US 3022756 A US3022756 A US 3022756A US 4671 A US4671 A US 4671A US 467160 A US467160 A US 467160A US 3022756 A US3022756 A US 3022756A
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United States
Prior art keywords
lever
stitch
length
adjusting
cam
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Expired - Lifetime
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US4671A
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English (en)
Inventor
Fresard Marcel
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Mefina SA
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Mefina SA
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Publication date
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Publication of US3022756A publication Critical patent/US3022756A/en
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B27/00—Work-feeding means
    • D05B27/22—Work-feeding means with means for setting length of stitch

Definitions

  • the present invention has for its subject a mechanism for adjusting the length of stitch on a sewing machine, comprising a control shaft of which the angular movements in one direction or the other from a median position, control the forward or return movements of the feeder.
  • the mechanism for adjusting the length of the stitch comprises a manual control member capable of being constituted by a control.
  • the mechanism for adjusting the length of the stitch according to the invention is characterised by the fact that it comprises a first lever secured to said control shaft and of which one end constitutes a handle, while the other end of said lever is provided with a slide in which is hinged one end of an intermediate lever, oscillating relative to the framework of the sewing machine, and the other end of said lever carries a feeler finger.
  • a cam of double profile is provided in a control wheel for adjusting the length of the stitch, the whole arrangement being so located that the profiles of the cam constitute a stop for the feeler finge and thus for the control shaft returned by a spring in the direction of maximum advance of the feeder.
  • the handle formed by the first lever permits imparting a momentary return movement to the feeder, which movement is capable of being controlled, on the other hand, by adjustment of the control wheel.
  • FIG. 1 is a view in plan of this mechanism, while FIG. 2 is a View in section on the line II-II of FIG. 1.
  • This mechanism for adjusting the length of the stitch described with reference to the drawing is supposedly mounted on a sewing machine, in the framework 1 of which is disposed a vertical shaft 2, constituting the control shaft of which the angular displacement in one direction or the other, from a medial position, controls the advance or return movements of the feeder of the machine.
  • a feeder of the type herein referred to is illustrated and
  • the mechanism according to the invention hasite St-te s Patent described in US. Patent No. 2,647,481.
  • On the upper end 3 of said control shaft 2 is secured a first lever 4, of which one end 5 constitutes a handle, while the other end 6 has a slide 7. In fact, as shown in FIG.
  • said slide 7 is formed by a fork, between the prongs 8 of which engages a trunnion 9 depending from one end of an intermediate lever 10.
  • This intermediate lever 1t is thus hinged in the slide 7 by its trunnion 9.
  • Said lever it) is mounted for oscillation on a spindle 11 secured rigidly t0 the framework 1 of the machine and said spindle passes through an elongated opening 28 of the lever 4.
  • the other end of said intermediate lever 13 carries an upstanding feeler finger or stud 12.
  • a control wheel 14 is socured, by means of a spindle 13, to the framework 1 of the machine.
  • this wheel 14- is drilled a cam 15 of double profile.
  • the feeler finger 12 is thus engaged in the cam 15 and normally bears against the internal profile 16 of the cam 15.
  • a spring tends to cause the control shaft 2 to turn in the direction of the arrow 17 in FIG. 2, that is .to say in a clockwise direction relatively to FIG. 1.
  • the intermediate lever 10 also tends to rotate in a clockwise direction, whereby the feeler finger 12 is displaced in the direction of the internal profile 16 of the cam 15.
  • This profile 16 thus constitutes a stop for the feeler finger 12 and thus for the control shaft 2 returned by its spring in the maximum advance direction of the feeder.
  • This profile 16 is formed in such a manner that when driving the control wheel 14 in a clockwise direction relatively to FIG. 1, from the zero position, there is provoked an elongation of the length of the stitch.
  • This control wheel 14 is maintained in a stable manner in any one of its angular positions, by reason of a plunger piston 18 sliding in a bore 19 of the framework of the machine, under the action of a spring Zil.
  • the end 21 of said piston 18 is sharpened in such a manne as to engage fine teeth 22 provided at the periphery of the control wheel 14.
  • a scale 24 permitting of reading opposite a mark carried by the framework 1 of the machine the value of the length of the selected stitch.
  • the trunnion 9 is secured to the lever ill by an eccentric device 25 capable of being locked in the position into which it has been moved by means of a screw 26 engaging transversely in the lever 10 and of which the point serves to lock the eccentric device 25.
  • the second profile 27 of the cam 15, that is to say the external profile of said cam is provided in such a manner as to impart to the feeder of the sewing machine, when the feeler finger 12 applies thereto, under the action of a pressure applied to the handle 5, a recoil movement of the same amplitude as that imparted by the first profile 16 for the advance movement, for the same position of the adjusting wheel 14.
  • shaft 2 controls a recoil movement of the feeder of an amplitude equal to that determined by the numeral 2 of the graduation 24 which was selected initially.
  • the return spring of the shaft 2 provokes the return of the feeler finger 12 against the profile 16 of the cam 15, that is to say that the sewing machine resumes its initial adjustment of the length of the stitch corresponding. to the numeral 2.
  • the sewing stitches during the rearward movement may be stitched without it being necessary to hold the handle 5 constantly.
  • the feeler finger 12 is located in the confined zone of the profiles 16 and 27 of the cam 15, a zone constituting, to some extent, a compuls sory cam. For this reason, the handle 5, carried by the lever 14, is inoperative.
  • control wheel 14 may be replaced by a control lever.
  • this may be different, according to the types of sewing machines to which this adjusting mechanism may be applied.
  • the adjusting ranges decrease from 0 to 4 on the scale 24, that is tosay that the profiles 16 and 27 are of such a shape that they permit of a better fineness of adjustment by means of the control wheel 14 for lengths of stitch of small amplitude than for those of large amplitude,
  • a sewing machine having a frame, a control shaft within said frame and adapted to be connected to a feeder, spring means connected to said control shaft and,
  • a mechanism for adjusting the stitch length and feed direction of the feeder of a sewing machine comprising a cam having an arcuate shaped aperture therein, a shaft around which said cam rotates, the opposite edges of said aperture forming inner and outer control profiles in the general shape of a spiral winding in inverse directions with regard to a median line concentric to said shaft from the point of zero amplitude to the point of maximum amplitude of the stitch length, a control wheel in which said cam is mounted for determining the adjustment of the stitch length, a first lever for permitting momentaryreversal of the direction of said feeder while maintaining a constant stitch length, a second lever mounted above said first lever and beneath said controlwheel, a stud on said second lever and engageable with said cam, said stud movable from one to theother of said cam profiles whereby the inner profile of said cam which provides the stitch length for forward movement is extended beyond the zero amplitude point to permit adjustment of the stitch length in a continuous manner by movement of saidcam through operation of said control wheel from the maximum reverse amplitude to the maximur

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US4671A 1959-01-30 1960-01-26 Mechanism for adjusting the length of stitch on a sewing machine Expired - Lifetime US3022756A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH6892659 1959-01-30

Publications (1)

Publication Number Publication Date
US3022756A true US3022756A (en) 1962-02-27

Family

ID=4529121

Family Applications (1)

Application Number Title Priority Date Filing Date
US4671A Expired - Lifetime US3022756A (en) 1959-01-30 1960-01-26 Mechanism for adjusting the length of stitch on a sewing machine

Country Status (10)

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US (1) US3022756A (enrdf_load_stackoverflow)
AT (1) AT219953B (enrdf_load_stackoverflow)
BE (1) BE586631A (enrdf_load_stackoverflow)
CH (1) CH347419A (enrdf_load_stackoverflow)
DE (1) DE1123542B (enrdf_load_stackoverflow)
DK (1) DK95912C (enrdf_load_stackoverflow)
ES (1) ES255381A1 (enrdf_load_stackoverflow)
FR (1) FR1245970A (enrdf_load_stackoverflow)
GB (1) GB931116A (enrdf_load_stackoverflow)
NL (1) NL247583A (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2379393C1 (ru) * 2008-08-04 2010-01-20 Государственное образовательное учреждение высшего профессионального образования "Ивановская государственная текстильная академия" (ИГТА) Устройство для изменения частоты стежка в процессе стачивания на универсальной швейной машине
CN112899897B (zh) * 2021-01-30 2024-09-20 琦星智能科技股份有限公司 一种具有零针距位置状态下执行剪线的缝纫机

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1118271A (en) * 1912-12-12 1914-11-24 Singer Mfg Co Feed-regulator for sewing-machines.
US2161579A (en) * 1938-04-23 1939-06-06 Singer Mfg Co Adjustable eccentric for sewing machines
US2818039A (en) * 1954-12-30 1957-12-31 White Sewing Machine Corp Reverse stitch control knob
FR1155837A (fr) * 1955-09-12 1958-05-08 Pfaff Ag G M Dispositif de réglage du point dans les machines à coudre
US2868150A (en) * 1955-12-20 1959-01-13 Borletti Spa Means for adjusting the stroke of the feed dog in sewing-machines
US2887968A (en) * 1956-10-09 1959-05-26 Pfaff Ag G M Stitch adjusting mechanism

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE964558C (de) * 1953-08-18 1957-06-06 Gritzner Kayser Ag Stichstellereinrichtung an Naehmaschinen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1118271A (en) * 1912-12-12 1914-11-24 Singer Mfg Co Feed-regulator for sewing-machines.
US2161579A (en) * 1938-04-23 1939-06-06 Singer Mfg Co Adjustable eccentric for sewing machines
US2818039A (en) * 1954-12-30 1957-12-31 White Sewing Machine Corp Reverse stitch control knob
FR1155837A (fr) * 1955-09-12 1958-05-08 Pfaff Ag G M Dispositif de réglage du point dans les machines à coudre
US2868150A (en) * 1955-12-20 1959-01-13 Borletti Spa Means for adjusting the stroke of the feed dog in sewing-machines
US2887968A (en) * 1956-10-09 1959-05-26 Pfaff Ag G M Stitch adjusting mechanism

Also Published As

Publication number Publication date
DK95912C (da) 1963-05-06
GB931116A (en) 1963-07-10
NL247583A (enrdf_load_stackoverflow)
BE586631A (fr) 1960-05-03
DE1123542B (de) 1962-02-08
AT219953B (de) 1962-02-26
CH347419A (fr) 1960-06-30
ES255381A1 (es) 1960-05-16
FR1245970A (fr) 1960-11-10

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