US3670677A - Looper drive mechanism - Google Patents

Looper drive mechanism Download PDF

Info

Publication number
US3670677A
US3670677A US73914A US3670677DA US3670677A US 3670677 A US3670677 A US 3670677A US 73914 A US73914 A US 73914A US 3670677D A US3670677D A US 3670677DA US 3670677 A US3670677 A US 3670677A
Authority
US
United States
Prior art keywords
looper
shaft
drive mechanism
arm
bore
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
US73914A
Other languages
English (en)
Inventor
Tetsuro Hirayama
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.)
Juki Corp
Original Assignee
Tokyo Juki Industrial Co Ltd
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 Tokyo Juki Industrial Co Ltd filed Critical Tokyo Juki Industrial Co Ltd
Application granted granted Critical
Publication of US3670677A publication Critical patent/US3670677A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/06—Loop takers, e.g. loopers for overedge-stitch sewing machines

Definitions

  • This invention relates to a looper drive mechanism or assembly for the sewing machine, and more particularly, an upper looper drive mechanism for sewing the cloth with a hem-stitch by coaction of the overlock sewing machine needle with upper and lower loopers.
  • a looper shaft is slidably supported by a looper shaft support one end of which is pivotally mounted to the sewing machine frame.
  • Such looper shaft support requires to have a relatively large diameter so that the support is caused to produce its axial movement when the looper shaft is moved.
  • a thrust ring is provided and rigidly secured to the support by a screw. Consequently, mass of the support reciprocally swingable in response to upward and downward movement of the looper shaft, becomes great. This requires more swing inertia of the support.
  • a looper drive mechanism or assembly according to the invention is arranged so that a looper shaft is supported by slidably mounting it within a bore through a drum element or member which is pivotally moved upon movement of the looper shaft, the drum member having a diameter sufficient to slidably hold the looper shaft.
  • Another object of the invention is to provide a looper drive mechanism by which defects as mentioned hereinbefore are eliminated to prolong life time of the sewing machine.
  • FIGS. 1 3 there is shown a drive shaft 2 which is disposed in a frame 1 of the sewing machine and rotatably .driven by a motor (not shown).
  • the motor not shown.
  • FIG. 1 but showing another drive shaft 2 is provided with a crank 3 thereon and thus serves a crank shaft.
  • a connecting rod 6 includes one end connected to a crank pin of the crank shaft and the other end connected to an arm 5 at one end thereof by the ball joint.
  • the arm 5 is fixedly mounted to a pivot 4 pivotally mounted to the frame 1.
  • the pivot 4 fixedly carries a swing arm 7 at one end thereof.
  • a support 10 is secured to the frame 1 by a plurality of screws 8 passing through a slot 9 formed in the support.
  • the support 10 includes a cylindrical opening 11 of which the center axis extends in a direction perpendicular to the axis of the crank shaft 2.
  • a pair of slots 12 are bored through a periphery wall defined by the opening 11 and the center axis passing through the slots 12 is perpendicular to the axis of the opening 11.
  • a drum member 14 having the outer diameter somewhat smaller than the inner diameter of the opening 11 is snugly received in the opening and adapted to rotate with respect to the opening 11.
  • the drum member 14 is provided with a bore 13 passing therethrough.
  • the opening 11 is closed at its one end by a cover or lid 15 through screws 22.
  • a thrust block 17 is received from the other end of the opening 11 and held therein by setscrews 16. This prevents the axial movement of the drum member 14 with respect to the opening 1 1.
  • a looper shaft 19 which mounts at one end thereof a looper 18 is provided to pass through the slots 12 in the support 10 and the bore 13 in the drum member 14.
  • the looper shaft further extends from the support and is pivotally connected at the other end by a pin 20 to the swing arm 7 at the other end thereof.
  • the rotational angle of the pivot 4 produced when the crank shaft 2 is rotated, the length of the arm 7, and the distance between the drum member 14 and the pivot 4 are detennined so that the looper 18 is raised, independently of location of the support with respect to the frame I, along a path by which the tip end of the looper is not brought into contact with a needle plate or feed plate 21 and a cloth and then faces thereon to act with a needle (not shown) thereby sewing the cloth with a hem-stitch.
  • the crank 3 of the crank shaft 2 is held in the raised position. Rotation of the crank shaft allows the connecting rod 6 connected to the crank pin to effect its reciprocal movement. More specifically, the lower movement of the connecting rod clockwise rotates the arm 5 about the pivot 4. As a result, the looper shaft 19 connected by the pin 20 to the swing arm 7 is upwardly urged. Since the looper shaft 19 is at its lower end pivotally mounted to the swing arm 7 and is at its upper end supported by the drum member 14, it is counterclockwise rotated about the drum member when it is upwardly urged. At the same time, the drum member 14 is also rotated with rotation of the looper shaft.
  • the tip end of the looper 18 moves up along a path indicated by the dotted line and faces on the needle plate or feed plate 21. That is, the looper 18 assumes the uppermost position at the termination of the path of movement of the looper when the connecting rod 6 is moved from the upper position to the lower position, namely, the crank shaft rotates through half revolution.
  • FIGS. 4 to 6 show another embodiment of the invention, wherein similar numerals are used to illustrate like parts shown in FIGS. 1 to 3.
  • each member in the second embodiment is identical with that in the preceding embodiment except the looper, it is deemed sufficient to describe only the looper.
  • the looper shaft 19 is provided at its upper end with a lateral opening 20' (FIG. 6) parallel to the axis of the opening 11.
  • a looper hold bar 23 is received in the opening 20' and is rigidly secured by a screw 24 threaded into the looper shaft 19 at its upper end.
  • the looper hold bar 23 is provided at its one end with a looper mount.
  • a looper 25 is fixed mounted to the looper mount of the bar 23 by means of a screw 26.
  • crank shaft, connecting rod, arm, swing arm, looper shaft is identical with that described when reference is made to the preceding embodiment.
  • support member 10 may be adjustably moved with respect to frame 1 by means of slot 9 and screws 8.
  • slot 9 and screws 8 may be adjusted.
  • a looper drive mechanism comprising a crank shaft as a driving shaft, a connecting rod one end of which is connected to a crank pin of said crank shaft, an arm coupled to the other end of said connecting rod, a pivot fixedly connecting said arm to the machine frame, the other end of said arm comprising a swing arm portion, a looper shaft, a looper mounted to said looper shaft at its top end, means pivotally mounting the lower end of said looper shaft to said swing arm, a support member adjustably fixed to said frame for supporting said looper shaft, said support member having a cylindrical opening and a pair of opposed slots in the peripheral wall defining said opening, and a drum member bodily and rotatably received in said opening, said drum member including a bore through which said looper shaft slidably passes and by which said looper shaft is supported to be slidable with respect to the axis of the bore, said bore communicating with said opposed slots, whereby said looper shaft extends through the bore of the drum member and the slots of the supporting member.
  • a looper drive mechanism in accordance with claim I said support member having therein a slot means for adjusting the position of said support on the frame and thereby adjusting the angle and position of said looper shaft.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US73914A 1969-09-25 1970-09-21 Looper drive mechanism Expired - Lifetime US3670677A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP44076452A JPS505621B1 (enrdf_load_stackoverflow) 1969-09-25 1969-09-25

Publications (1)

Publication Number Publication Date
US3670677A true US3670677A (en) 1972-06-20

Family

ID=13605525

Family Applications (1)

Application Number Title Priority Date Filing Date
US73914A Expired - Lifetime US3670677A (en) 1969-09-25 1970-09-21 Looper drive mechanism

Country Status (2)

Country Link
US (1) US3670677A (enrdf_load_stackoverflow)
JP (1) JPS505621B1 (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3952674A (en) * 1973-11-16 1976-04-27 Juki Co., Ltd. Method and apparatus for adjusting the looper operation locus of a sewing machine
DE3427593A1 (de) * 1983-07-29 1985-02-07 Rockwell-Rimoldi S.p.A., Olcella, Mailand/Milano Vorrichtung fuer die einstellung der lage eines oberen haekelhakens an einer maschine fuer ueberwendliches naehen
US4543896A (en) * 1983-11-30 1985-10-01 Rockwell-Rimoldi S.P.A. Device for adjusting the trajectory of the upper looper in an overlocking sewing machine
DE3709023C1 (de) * 1987-03-19 1988-06-01 Union Special Gmbh Greiferantrieb fuer eine Kettenstichnaehmaschine
US4799439A (en) * 1981-07-14 1989-01-24 Maruzen Sewing Machine Co., Ltd. Double purpose looper for overlocking sewing machine
US4799440A (en) * 1981-08-11 1989-01-24 Maruzen Sewing Machine Co., Ltd. Looper changeover device
US20080202400A1 (en) * 2007-02-23 2008-08-28 Juki Corporation Upper looper driving device of sewing machine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2811940A (en) * 1955-10-13 1957-11-05 Rimoldi C Spa Virginio Looper control for sewing machines
US2812735A (en) * 1955-07-13 1957-11-12 Willcox & Gibbs Sewing Machine Loop spreading mechanism for sewing machines

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2812735A (en) * 1955-07-13 1957-11-12 Willcox & Gibbs Sewing Machine Loop spreading mechanism for sewing machines
US2811940A (en) * 1955-10-13 1957-11-05 Rimoldi C Spa Virginio Looper control for sewing machines

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3952674A (en) * 1973-11-16 1976-04-27 Juki Co., Ltd. Method and apparatus for adjusting the looper operation locus of a sewing machine
US4799439A (en) * 1981-07-14 1989-01-24 Maruzen Sewing Machine Co., Ltd. Double purpose looper for overlocking sewing machine
US4799440A (en) * 1981-08-11 1989-01-24 Maruzen Sewing Machine Co., Ltd. Looper changeover device
DE3427593A1 (de) * 1983-07-29 1985-02-07 Rockwell-Rimoldi S.p.A., Olcella, Mailand/Milano Vorrichtung fuer die einstellung der lage eines oberen haekelhakens an einer maschine fuer ueberwendliches naehen
GB2144157A (en) * 1983-07-29 1985-02-27 Rockwell Rimoldi Spa Mechanism for adjusting the position of the upper looper in whipstitching machines
US4543896A (en) * 1983-11-30 1985-10-01 Rockwell-Rimoldi S.P.A. Device for adjusting the trajectory of the upper looper in an overlocking sewing machine
US4779550A (en) * 1987-03-19 1988-10-25 Union Special G.M.B.H. Looper drive for a chainstitch sewing machine
GB2202242A (en) * 1987-03-19 1988-09-21 Union Special Gmbh A looper drive for a chain stitch sewing machine
DE3709023C1 (de) * 1987-03-19 1988-06-01 Union Special Gmbh Greiferantrieb fuer eine Kettenstichnaehmaschine
GB2202242B (en) * 1987-03-19 1990-11-21 Union Special Gmbh A looper drive for a chain stitch sewing machine
US20080202400A1 (en) * 2007-02-23 2008-08-28 Juki Corporation Upper looper driving device of sewing machine
US7600481B2 (en) * 2007-02-23 2009-10-13 Juki Corporation Upper looper driving device of sewing machine
CN101250797B (zh) * 2007-02-23 2012-12-12 Juki株式会社 缝纫机的上打环器驱动机构

Also Published As

Publication number Publication date
JPS505621B1 (enrdf_load_stackoverflow) 1975-03-05

Similar Documents

Publication Publication Date Title
US3670677A (en) Looper drive mechanism
US4419946A (en) Feeding device for an automatic sewing arrangement
US5503093A (en) Embroidering-frame driving device for a sewing machine and method of controlling the device
US3645221A (en) Needle operation device in high-speed sewing machines
US3653348A (en) Ruffling attachment for a stitching machine
US3835716A (en) Crank-driven reciprocating mechanisms
US2438636A (en) Sewing machine
JPS61176391A (ja) ジグザグミシン
US2005673A (en) Sewing machine
JPS6143421Y2 (enrdf_load_stackoverflow)
US3059600A (en) Looper mechanism
JPH0226459Y2 (enrdf_load_stackoverflow)
US3195487A (en) Drive mechanism for feed dogs of sewing machines
US3552338A (en) Means for elimination of end play in a sewing machine
US2811940A (en) Looper control for sewing machines
CN109706640A (zh) 一种缝纫机及其挑线机构
US4926770A (en) Needle hole guide mechanism for zigzag sewing machine
US3677208A (en) Blindstitch sewing machine
US2505523A (en) Retaining device for rotary hooks
JPS5816389Y2 (ja) ミシンの天秤装置
US2414227A (en) Sewing machine
US3429275A (en) Interlock sewing machines
US101140A (en) Improvement in sewing-machine
US780725A (en) Sewing-machine loop-taker driver.
JPS5931745Y2 (ja) 刺繍用ミシンの巻糸ボビン取付装置