US3892193A - Driving gear for the looper of a chain stitch sewing machine - Google Patents

Driving gear for the looper of a chain stitch sewing machine Download PDF

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Publication number
US3892193A
US3892193A US487688A US48768874A US3892193A US 3892193 A US3892193 A US 3892193A US 487688 A US487688 A US 487688A US 48768874 A US48768874 A US 48768874A US 3892193 A US3892193 A US 3892193A
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US
United States
Prior art keywords
axle
looper
eccentric
rocker
crank
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
US487688A
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English (en)
Inventor
Ernst Lienemann
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.)
VEB NAHMASCHINENWERK WITTENBERGE
Original Assignee
VEB NAHMASCHINENWERK WITTENBERGE
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 VEB NAHMASCHINENWERK WITTENBERGE filed Critical VEB NAHMASCHINENWERK WITTENBERGE
Application granted granted Critical
Publication of US3892193A publication Critical patent/US3892193A/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
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/02—Loop takers, e.g. loopers for chain-stitch sewing machines, e.g. oscillating

Definitions

  • a drive mechanism for the looper of a chain stitch i 1 Forelg" pp Dam sewing machine is of simplified construction compris- July 23, 1973 Germany .s 172443 ing a drive shaft with a crank and an eccentric.
  • a rocker element is secured to a looper carrying axle [52] US. Cl. 112/200 and is arranged to be rocked by said crank to produce ⁇ 5] ⁇ Int.
  • the present invention seeks to provide a simple and effective drive mechanism for the looper of a chain stitch sewing machine which avoids or limits these disadvantages.
  • FIG. I is a perspective view of a drive mechanism according to this invention.
  • FIG. 2 is an exploded view showing the various elements of the mechanism of FIG. I.
  • FIG. 3 is a persepective view of an alternative form of drive mechanism.
  • FIGS. 1 and 2 comprises a looper drive shaft I which has a crank 2 with crank webs and a crank pin, the crank web most remote from the observer of FIG. 1 having a counter-weight 6.
  • the drive shaft is mounted in bearings schematically illustrated at 4 and 5.
  • crank pin of the crank extends through windows formed in the web portion of the rocker.
  • the slide is formed as two parts I4 and I as shown in FIG. 2, those two parts being held together by pan head screws 16 and I7.
  • the crank web closest to an observer in FIGS. I and 2 is provided with flattened surfaces 12 and 13 to pass through the window in the web of the rocker element.
  • the drive shaft adjacent to the crank web, has an eccentric portion 19 upon which is arranged a coupling or slide element 20.
  • the surfaces 21 and 22 are disposed to bear upon the faces 23 and 24 of the arms of the rocker element 7, there being sliding movement between these adjacent surfaces during the rotation of the eccentric I9.
  • screws 25 and 26 extend across the space between the arms and are secured by nuts 27 and 28. This provides the appropriate rigidity for the structure.
  • the rocker is secured to the looper axle 8 and to extension bolt 9 by means of screws of 29, 30, 31 and 32, and holes are formed in the ends of the arms of the rocker element in which the axle 8 and bolt 9 are disposed.
  • a looper holder 33 is secured upon axle 8 by means of screw 36 and a looper 34 is secured is secured to holder 33 by means of screw 35.
  • the crank causes reciprocation of the slider 3 within the slideway of the rocker element 7 so that the rocker is reciprocated, turning the axle 8 back and forth.
  • the eccentric 9 causes the coupler 20 to reciprocate the axle 8 axially so that the looper describes the required elliptical path for stitch formation.
  • FIG. 3 in the drawings is largerly similar to that of FIGS. 1 and 2 except that the axis of the drive shaft 1 does not intersect the axis of the looper axle 8. Additionally, the looper axle 8 has an cecentric portion 37 upon which the rocker element is mounted. This results in a distorted path of the looper as shown at P in FIG. 3. The path has semi-major axes of unequal length and with this arrangement, improved stitch formation when catching the needle thread loop, is achieved.
  • adjustment of the cam 37 provides for variation in the stroke in the movement of the looper.
  • a looper driving gear comprising a drive shaft, a crank on said drive shaft, a slide pivotally mounted on a crank pin of said crank for rotation relative thereto, said slide being slidably mounted in a slideway of a rocker element, said rocker element being secured to a looper axle normal to the axis of the drive shaft and parallel to said slideway to impart rotary reciprocating motion to said axle, an eccentric on said drive shaft, a coupling element ro table on said eccentric and coupling said eccentric to said rocker to impart reciprocating movement to said rocker and said looper axle in the direction of the axis of that axle, the crank and eccentric being constituted as means imparting elliptical movement to a looper element secured to said axle.
  • said rocker element comprises a generally U-shaped member having arm portions and a web portion connecting said arm portions, said rocker element being secured to said axle at distal ends of the arm portions thereof and wherein said slideway is defined by said web portion.
  • said coupling element comprises an element disposed between the arms of said rocker element and mounted upon said eccentric and having a sliding contact with the arms of the coupler element and being effective to shift the coupler element and the axle in the longitudinal direction of said axle.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US487688A 1973-07-23 1974-07-11 Driving gear for the looper of a chain stitch sewing machine Expired - Lifetime US3892193A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DD172443A DD112790A1 (it) 1973-07-23 1973-07-23

Publications (1)

Publication Number Publication Date
US3892193A true US3892193A (en) 1975-07-01

Family

ID=5492171

Family Applications (1)

Application Number Title Priority Date Filing Date
US487688A Expired - Lifetime US3892193A (en) 1973-07-23 1974-07-11 Driving gear for the looper of a chain stitch sewing machine

Country Status (7)

Country Link
US (1) US3892193A (it)
JP (1) JPS5619996Y2 (it)
DD (1) DD112790A1 (it)
DE (2) DE2426721A1 (it)
HU (1) HU176140B (it)
IT (1) IT1016360B (it)
SU (1) SU548675A1 (it)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT501704B1 (de) * 2005-03-22 2008-08-15 Sahl Johannes Kettenstich-nähmaschine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1915923A (en) * 1931-05-27 1933-06-27 Singer Mfg Co Throw-out looper mechanism for sewing machines
US2351831A (en) * 1943-02-23 1944-06-20 Singer Mfg Co Sewing machine looper mechanism
US2397336A (en) * 1945-01-01 1946-03-26 Singer Mfg Co Looper throwout mechanism
US2998787A (en) * 1959-06-22 1961-09-05 Duerkoppwerke Loop taker mechanism for chainstitch sewing machines
US3112720A (en) * 1961-05-10 1963-12-03 Necchi Spa Device for driving the hook shaft of a double-stitch sewing machine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1915923A (en) * 1931-05-27 1933-06-27 Singer Mfg Co Throw-out looper mechanism for sewing machines
US2351831A (en) * 1943-02-23 1944-06-20 Singer Mfg Co Sewing machine looper mechanism
US2397336A (en) * 1945-01-01 1946-03-26 Singer Mfg Co Looper throwout mechanism
US2998787A (en) * 1959-06-22 1961-09-05 Duerkoppwerke Loop taker mechanism for chainstitch sewing machines
US3112720A (en) * 1961-05-10 1963-12-03 Necchi Spa Device for driving the hook shaft of a double-stitch sewing machine

Also Published As

Publication number Publication date
SU548675A1 (ru) 1977-02-28
HU176140B (en) 1980-12-28
DE2426721A1 (de) 1975-02-13
DE7419103U (de) 1982-03-18
JPS5057658U (it) 1975-05-29
DD112790A1 (it) 1975-05-05
IT1016360B (it) 1977-05-30
JPS5619996Y2 (it) 1981-05-12

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