US2988030A - Freely rotating looper for sewing machines - Google Patents

Freely rotating looper for sewing machines Download PDF

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Publication number
US2988030A
US2988030A US772331A US77233158A US2988030A US 2988030 A US2988030 A US 2988030A US 772331 A US772331 A US 772331A US 77233158 A US77233158 A US 77233158A US 2988030 A US2988030 A US 2988030A
Authority
US
United States
Prior art keywords
looper
cage
thread
ring
supporting ring
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
US772331A
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English (en)
Inventor
Schenkengel Emerich
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.)
GM Pfaff AG
Original Assignee
GM Pfaff AG
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
Priority claimed from DEP19629A external-priority patent/DE1053293B/de
Application filed by GM Pfaff AG filed Critical GM Pfaff AG
Application granted granted Critical
Publication of US2988030A publication Critical patent/US2988030A/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
    • D05B57/08—Loop takers, e.g. loopers for lock-stitch sewing machines
    • D05B57/10—Shuttles
    • D05B57/14—Shuttles with rotary hooks

Definitions

  • the invention relates to sewing machines and is more particularly concerned with a freely rotating looper in which the bearing rib of the bobbinrcasing is guided in a track formed between a shoulder in the looper cage, and a supporting ring fastened to the looper cage.
  • the supporting ring which forms the sole front part of the track can move resiliently in the direction of the axis of the looper, thereby functioning as a guiding device for the thread at the front side of the rotating looper.
  • resistance against temporary track expansion is provided not only by the inherent radial resilience of the supporting ring, changed in direction by the inclined surface of the ring slot, but also the frictional forces which arise with the entrance of the thread between thread and supporting ring and between supporting ring and groove and which are likewise guided in the direction of the axis, and both of which can be increased in an uncontrollable manner by accidental causes. Accordingly it is not certain, that upon entrance of the thread, the supporting ring can move aside, so that the looper, and with it all other transmission parts of the machine come to a sudden stop, which is undersirable for different reasons. It is a further disadvantage that the supporting ring, which is wedged in the interior of the looper cage, cannot readily be reached by hand so that its insertion is cumbersome, and its removal is possible only with the aid of tools.
  • a looper is provided of the aforementioned type in which the bearing rib of the bobbin case is received in a track formed by a shoulder on the looper cage and a supporting ring secured to the looper cage, where only the supporting ring tates atent 2,988,030 Patented June 13, 1961 complished by inserting the supporting ring between the forms the front part of the journal track and is capable of yielding resiliently in the direction axially of the looper acting at the same time as a guide for the thread along the front side of the rotating looper, which supporting ring is connected with the external surface of the looper cage and embraces the looper cage wall and is of U-shaped cross section at its front side, and together with the shoulder, it forms the bearing track engaging the front part of the looper cage
  • looper cage and a flanged portion of the shell or casing which surrounds and is fastened to the looper cage and spaced therefrom, which ring is slotted to provide resilient stop tongues which, in turn, are provided with gripping knurls and are in engagement with the shell by their inherent resiliency.
  • the ring For purposes of holding the upper thread loop which must be guided around the front of the bobbin case securely against the base of the looper tip until the casing is seated the ring forms an obtuse angle between a thread guiding blade extending obliquely at radial distance across.
  • the mounting and removal of the supporting ring can be further facilitated in that part of the leg which projects into the looper cage and the contact surface of the supporting ring, are cut out over an angle, which is greater than that part of the bobbin case, which extends beyond the inner radius of the supporting ring.
  • the slanting flank of the thread guide blade is interrupted in order to prevent colliding of the needle with the guide sheet. This, however, forms a hook like projection, which can catch and entangle the thread when the machine rotation is inadvertently reversed.
  • the slanting flank of the thread guide blade which is connected with the supporting ring, is terminated approximately 183 behind the looper tip, and is of closed design.
  • FIG. 1 shows the parts of the looper in an exploded view
  • FIG 2 shows the assembled looper mounted on the shaft partly in section taken along line II-II of FIG. 1 and
  • FIG. 3 is an enlarged view of a portion of FIG. 2 illus trating details of interengaged components.
  • the complete looper comprises a housing or casing 1, a looper cage 2, and a supporting ring 3, Which rotate together, and a stationary bobbin casing constituted of a lower shell 4 and an upper shell 5.
  • Casing 1 which surrounds mounting sleeve 7 of the looper cage 2 by means of a center bore 6 is connected portion 15 of casing 1 embraces with radial clearance the outer circumference of the looper cage 2, and is inclined inwardly and rearwardly and is undercut or backed off on the inside (FIG. 3).
  • the inner surface of the looper cage 2 is counter bored, thus forming a shoulder 16 against which lower shell 4 comes to rest with its journal rib 17 after insertion.
  • the lower shell 4 is supported in this position by supporting ring 3.
  • Said supporting ring 3 extends with its part 1S,
  • journal rib 17 is accurately guided in this track but without pressure induced friction.
  • Tongues 19 which by virtue of their form can also deflect within small limits in the direction of the axis of the looper, permit flexible expansion of the track when the thread is drawnin.
  • the inner leg 24 of the supporting ring 3' is located at a radial distance from the inner surface of the looper cage 2 (FIG. 2). As a result, thread drawn into the track finds clearance in the free space between the leg 24', and the inner surface of the looper cage 2.
  • supporting ring 3 functions as a thread guide at the front of the rotating looper portion.
  • supporting ring 3 is provided with a thread guiding rim 26 which slants across the looper tip 25 at a radial distance, and is also provided with a thread deflecting blade 27. The receding flank 29 thereof is closed against the ring 3 so that even during inadvertent reversal of the machine the thread can slide over it unretarded.
  • the outer part 18 of the supporting ring 3 is alsoequipped with a cutout 32,. into which projects a pin to prevent twisting of the supporting ring 3.
  • the supporting end 33 of the pin is shown in FIG. 1 in the interior of the looper case 2;
  • the lower shell '4 and the upper shell are generally of standard construction.
  • a special feature is merely the guide bore 34 for the lower thread provided in the upper shell 5, and care is taken that the supporting ring 3 can just be removed forwardly after disengagement by compression of the tongues 19;
  • projecting portion 35 of lower shell 4 which extends past the inner radius of supporting ring 3 is designed to cover a. smaller angle than the cutout of the inner leg 24 and the supporting area 22 of the supporting ring 3.
  • looper cage and including a lower shell having a radi ally extending rib and an upper shell received in said a 7 lower shell for interengagement therewith, and a supporting ring
  • said looper cake having an interrupted cylindrical wall portion presenting a looper tip and having a recess along the inner periphery defining a, shoulder and said ring having a portion defining a channel of -U'-shaped cross section including an inner leg radially spaced from said inner wall of said cage extending toward said shoulder and forming with said shoulder a track accommodating said rib and an outer leg formed as a part of an outer portion of cylindrical conformation, said outer portion extending around a portion of the outer wall of said cage and having a portionextending transversely of said looper tip adapted to guide the thread and having flexible tongue means loosely engaging said flange portion.
  • a freely rotatable looper for sewing machines comprising a housing having a flange portion, a looper cage mounted in said housing and radially spaced from said flange portion, a bobbin casing received in said looper cage and including a lower shell having a radially extending rib and an upper shell received in said lower shell for interengagement therewith, and a supporting ring, said looper cage having an interrupted cylindrical wall portion presenting a looper tip and having a recess along the inner periphery defining a shoulder and said ring having a portion defining a channel of U-shaped' crosssection: including an inner leg radially spaced from said inner Wall of said cage extending toward said shoulder and forming with said shoulder a track accommodating said rib and an outer leg formed as a part of an outer portion of cylindrical conformation, said outer portion extending around a portion of the outer wall of said cage and having a portion extending transversely of said looper tip adapted to guide the thread, said flange portion extending inwardly
  • a freely rotatable looper for sewing machines comprising a housing having a flange portion, a looper cage mounted in said housing and radially spaced from said flange portion, a bobbin casing received in said looper cage and including a lower shell having a radially extending rib and an upper shell received in said lower shell for inter engagement therewith, and a supporting ring, said looper cage having an interrupted cylindrical wall portion presenting a looper tip and hav- .ing a recess along the inner periphery defining a shoulder and said ring having aportion defining a channel of U-shaped cross section including an inner leg radially spaced from said inner wall of said cage extending toward said shoulder and forming with said shoulder a trackaccommodating said rib and an outer leg formed as a part of an outer portion ofcy-lind-rical conformation, said outer portion extending around a portion of the, outer; wall of said cage, andhaving a portion extending transversely of said looper tip
  • gripping knobs and presenting grooves adapted .to engage said flange portion,,said portion onrsaid, ring adapted t0 guide the thread including ajguiding edge extending obliquely between and radially. outwardly ofrsaid looper tip and the base of. saidtip, and defining. an, obtuse angle proximate said base adapted to .hold the'thread guided around the front of said upper shell;
  • a freely rotatable, looper for sewing machines comprising a housing having a flange portion, a looper cage mounted in said housinguand radially spaced from said flange portion, a hobbin casing received in said looper cageand including-a lower, shell. having a radially extend ing rib and an upper shell received insaid lower sheli for interengagement therewith, and alsupp orting ring, said looper cage havingan interrupted cylindrical wall portion presenting a loopertipand. having a recess along the inner 'peripherydefining a shoulder and said ring.
  • a freely rotatable looper for sewing machines comprising a housing having a flange portion, a looper cage mounted in said housing and radially spaced from said flange portion, a bobbin casing received in said looper cage and including a lower shell having a radially extending rib and an upper shell received in said lower shell for interengagement therewith, and a supporting ring, said looper cage having an interrupted cylindrical wall portion presenting a looper tip and having a recess along the inner periphery defining a shoulder and said ring having a portion defining a channel of U-shaped cross section including an inner leg radially spaced from said inner wall or said cage extending toward said shoulder and forming with said shoulder a track accommodating said rib and an outer leg formed as a part or an outer portion of cylindrical conformation, said outer portion extending around a portion of the outer wall of said cage and having a portion extending transversely of said looper tip adapted to guide the thread, said flange portion extending inwardly of said

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US772331A 1957-11-11 1958-11-06 Freely rotating looper for sewing machines Expired - Lifetime US2988030A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP19629A DE1053293B (de) 1957-11-11 1957-11-11 Frei umlaufender Greifer fuer Naehmaschinen
DEP21560A DE1067669B (de) 1957-11-11 1958-10-21 Frei umlaufender Greifer fuer Naehmaschinen

Publications (1)

Publication Number Publication Date
US2988030A true US2988030A (en) 1961-06-13

Family

ID=25989840

Family Applications (2)

Application Number Title Priority Date Filing Date
US772331A Expired - Lifetime US2988030A (en) 1957-11-11 1958-11-06 Freely rotating looper for sewing machines
US847495A Expired - Lifetime US3053208A (en) 1957-11-11 1959-10-20 Freely rotating looper for sewing machines

Family Applications After (1)

Application Number Title Priority Date Filing Date
US847495A Expired - Lifetime US3053208A (en) 1957-11-11 1959-10-20 Freely rotating looper for sewing machines

Country Status (6)

Country Link
US (2) US2988030A (sl)
BE (1) BE572732A (sl)
CH (2) CH364684A (sl)
DE (1) DE1067669B (sl)
FR (1) FR1213898A (sl)
GB (2) GB861730A (sl)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3447499A (en) * 1966-03-22 1969-06-03 Janome Sewing Machine Co Ltd Rotary loop forming device for sewing machines
CN103097600A (zh) * 2010-08-25 2013-05-08 姜小大 缝纫机底线供应装置
CN103306063A (zh) * 2013-07-01 2013-09-18 汪凡 一种缝纫机底线供线装置

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8032365U1 (de) * 1980-12-05 1981-07-16 Kochs Adler Ag, 4800 Bielefeld Nadelfuehrung einer naehmaschine
US4966088A (en) * 1987-03-13 1990-10-30 Bakron Corp. Composite rotary loop taker for lock-stitch sewing machine
GB2205862B (en) * 1987-03-13 1990-12-12 Paul Badillor Composite rotary loop taker for lock-stitch sewing machine
KR930003517B1 (ko) * 1990-05-15 1993-05-01 가부시끼가이샤 히로세세이사꾸쇼 전회전북
DE19510830C2 (de) * 1995-03-24 2001-11-22 Duerkopp Adler Ag Spulenbremse für die Greiferfaden-Spule einer Doppelsteppstich-Nähmaschine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2015472A (en) * 1933-10-10 1935-09-24 Singer Mfg Co Loop-taker for sewing machines
US2435358A (en) * 1946-09-24 1948-02-03 Singer Mfg Co Rotary hook for sewing machines
US2523230A (en) * 1948-02-07 1950-09-19 Gellman Mfg Company Rotary hook mechanism of sewing machines
US2839019A (en) * 1953-05-13 1958-06-17 Pfaff Ag G M Hook for double stitch sewing machine
US2873706A (en) * 1956-01-23 1959-02-17 Nippon Mishin Seizo Kabushiki Sewing mechanism of sewing machine

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2102954A (en) * 1937-03-02 1937-12-21 Richard K Hohmann Rotary loop taker
US2469517A (en) * 1948-03-08 1949-05-10 Gellman Mfg Company Sewing-machine loop taker
DE1053293B (de) * 1957-11-11 1959-03-19 Pfaff Ag G M Frei umlaufender Greifer fuer Naehmaschinen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2015472A (en) * 1933-10-10 1935-09-24 Singer Mfg Co Loop-taker for sewing machines
US2435358A (en) * 1946-09-24 1948-02-03 Singer Mfg Co Rotary hook for sewing machines
US2523230A (en) * 1948-02-07 1950-09-19 Gellman Mfg Company Rotary hook mechanism of sewing machines
US2839019A (en) * 1953-05-13 1958-06-17 Pfaff Ag G M Hook for double stitch sewing machine
US2873706A (en) * 1956-01-23 1959-02-17 Nippon Mishin Seizo Kabushiki Sewing mechanism of sewing machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3447499A (en) * 1966-03-22 1969-06-03 Janome Sewing Machine Co Ltd Rotary loop forming device for sewing machines
CN103097600A (zh) * 2010-08-25 2013-05-08 姜小大 缝纫机底线供应装置
CN103306063A (zh) * 2013-07-01 2013-09-18 汪凡 一种缝纫机底线供线装置

Also Published As

Publication number Publication date
GB861730A (en) 1961-02-22
CH364684A (de) 1962-09-30
BE572732A (sl)
FR1213898A (fr) 1960-04-05
DE1067669B (de) 1959-10-22
US3053208A (en) 1962-09-11
GB870221A (en) 1961-06-14
CH368693A (de) 1963-04-15

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