US3494316A - Thread wiping device - Google Patents

Thread wiping device Download PDF

Info

Publication number
US3494316A
US3494316A US780343A US3494316DA US3494316A US 3494316 A US3494316 A US 3494316A US 780343 A US780343 A US 780343A US 3494316D A US3494316D A US 3494316DA US 3494316 A US3494316 A US 3494316A
Authority
US
United States
Prior art keywords
thread
needle
wiping
crank
over
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
US780343A
Other languages
English (en)
Inventor
Roger J Ross
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.)
SSMC Inc
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
Application granted granted Critical
Publication of US3494316A publication Critical patent/US3494316A/en
Anticipated expiration legal-status Critical
Assigned to SSMC INC., A CORP. OF DE reassignment SSMC INC., A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SINGER COMPANY, THE
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B65/00—Devices for severing the needle or lower thread
    • D05B65/06—Devices for severing the needle or lower thread and for disposing of the severed thread end ; Catching or wiping devices for the severed thread
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers

Definitions

  • the thread wiper includes a member for engaging and 'withdrawing the needle thread-end, a rotary solenoid having a crank and associated driving linkage for moving the needle thread engaging member, and an abutment iixed relatively to the linkage against which the crank engages upon its retraction to a position over-center thereby locking the linkage in its deactivated at-rest position.
  • This invention relates to structure for wiping a severed sewing machine needle thread from the work fabric at the completion of a stitching operation, and temporarily retaining the severed thread-end until the beginning of the succeeding stitching operation.
  • a needle thread Wiper having a thread-engaging member which is safe and predictably free from being undesirably drawn into the path of needle reciprocation upon thread severing failure, eifectively preventing damage to the sewing needle and/or being damaged thereby.
  • a conventional rotary solenoid may have built-in stop positions or, in effect, a maximum deactivated retractable position and a maximum activated throw position, within which limits lthe solenoid is operable. Should a rotary solenoid so equipped be employed, this invention, nonetheless, lies in the particular orientation of the built-in stop positions relative to the driving linkage, which orientation accommodates an over-center position of the driving linkage.
  • the over-center position is that critical position beyond which the solenoid actuated crank must retract upon deactivation so as to facilitate a temporary self-imposed locking of the thread wiping assembly in its deactivated state.
  • this invention comprises the devices, combinations, and arrangements of parts hereinafter described and illustrated in the accompanying dra-W- ings of a preferred embodiment in which:
  • FIG. l represents an elevational view, partly in section, of a portion o-f a sewing machine having the present invention applied thereto.
  • FIG. 2 represents a perspective view of a sewing machine presser-foot, a thread carrying needle and a portion of the thread-wiping-element in a state of retraction and seizing a severed needle thread-end.
  • FIG. 3 represents a perspective view similar to FIG. 2 but showing the thread wiper in its extended thread engaging position.
  • FIG. 4 represents an elevational view with a modification in which a rotary solenoid lwith a crank and connecting rod are illustrated in a position over-center with the crank engaging an abutment xed over-center.
  • FIG. 5 represents an elevational view of a further modication in which an alternate locking means is illustrated with the connecting rod engaging an extended abutmentshoulder on the thread-wiping-element.
  • FIG. 6 illustratess the assembled thread-wiping-element.
  • FIG. 1 The present invention as shown in FIG. 1 is illustrated as embodied on a conventional lockstitch sewing machine, indicated generally at 10, having a frame including a work supporting bed 11, over which is supported a bracket arm (not shown), terminating in a sewing head 12.
  • a needlebar 13 Supported for endwise reciprocation in the sewing head 12 is a needlebar 13 having at its lower end a conventional needle clamp 14 in which is detachably secured a needle 15.
  • Shiftably supported for vertical movement in the sewing head 12 is a spring depressed presser-bar 16 carrying at its lower end a presser-foot 17.
  • a conventional loop-taker or rotating hook 18 In the bed and cooperating with the needle 15 to form stitches.
  • a support plate 21 Mounted on the support plate 21 by means of a pair of screws 22-22 is a conventional rotary solenoid 23 having an armature 24 which extends through an opening 25 in the support plate 21. Supported on, and driven by, the armature 24 is a crank 30. Connected to the crank 30 by means of a pin 31 is one end of a connecting link 32. The other end of the connecting link 32 is connected to a block 35 by means of a driving stud 36.
  • a cylindrical bore accommodating one extremity of a cylindrical rod 38, which extremity is secured in the block 35 by a set screw 39;
  • the other extremity of the cylindrical rod 38 has an axially formed slot 40, shown in FIG. 6, within which a threadwiping spring-iinger 41 is secured by means of a pin 42.
  • the thread-wiping spring-finger is preferably made of flat resilient material such as spring steel having its lower free extremity formed with a .point 43 and at one side a barb 44.
  • a bushing 50 which bushing Shiftably supports a presser-bar 16.
  • a mounting block 51 Fastened to the bushing 50 is a mounting block 51 formed with a split aperture 52, which aperture accommodates the presser-bar bushing 50.
  • the mounting block 51 is deta3chably secured to the bushing 50 by a clamping screw 5
  • the mounting block 5.1 is formed with an inclined semi-cylindrical groove 55, which groove 55 is complementa] to an enclosed semi-cylindrical groove 56 formed in the clamping bar 58.
  • the clamping bar 58 may be secured to the mounting block 51 by means of the screw 59.
  • crank 30 and connecting link 32 have a mutually overlapping position as shown in FIG. 4, which position will hereinafter be referred to as an over-center position.
  • the rotary solenoid 23 is fixed relative to frame 10 on the support plate 21 such that the limits of deactivated retraction and maximum activated throw of the rotary solenoid or, in effect, the solenoid range of operability, include the aforementioned over-center position of the crank 30 relative to the connecting link 32.
  • FIG. 1 includes an illustration of a conventional sewing machine rotating hook 18 formed with a needle thread seizing beak S1 for seizing and carrying a loop of needle thread 65 about a bobbin thread (not shown), the bobbin thread issuing from a bobbin case 83.
  • the thread trimming device includes a thread-catching-element 84 selectively shiftable for engaging and seizing both the bobbin thread and needle thread 65 and for drawing these threads into the path of a thread cutting knife 86.
  • the structure disclosed herein greatly depends on the functional stability of the threadtrimming mechanism. Should the thread-trimming mechanism fail to sever the needle thread at the end of a line of stitches, then during the successive stitching operation the thread-wiping spring-finger 41 may be subsequently pulled into the path of the reciprocating needle by the unsevered needle thread, which thread the spring-finger 41 has timely seized. This may occur in the absence of an accommodation of the over-center position by the operable range of the solenoid, thereby subjecting the needle and threadwiping spring-finger 4.1 to potential damage upon their mutual collision.
  • FIG. 4 illustrates a modified form of construction in which an abutment stop lug is carried by, or formed as a part of, the support plate 21.
  • the stop lug is positioned for cooperative engagement with the crank 3() in a position of the crank slightly beyond the aforementioned over-center position.
  • the stop lug 90 may replace the built-in stops with which the rotary solenoids may be equipped.
  • the stop lug 90 may also be used together with, and in addition to, a rotary solenoid equipped with built-in stops in which case the stop lug 90 provides for a more selectively predeterminable and more structurally rigid locking means.
  • FIG. 5 A further modification is illustrated in FIG. 5 in which a stop abutment is carried by, or formed as a part of, the block 351.
  • the block 351 in this modication is formed with a shoulder 101 extended in the direction of the cylindrical rod 38 so as to position the abutment 100 for cooperative engagement with the connecting link 32 in a position over-center upon the deactivated retraction of crank 30.
  • a needle-thread-wiping device adapted for use on a sewing ymachine having a frame, a thread-carrying needle supported in said frame for reciprocation in an endwise path, and a thread-trimming mechanism associated with said sewing machine including a threadsevering element, said thread-wiping device comprising in combination:
  • a linkage means including a crank and a link connecting said crank with said thread-wiping element, said linkage means having an over-center position defined by a mutually overlapping relationship of said link with said crank;
  • a needle thread-wiping device as set forth in claim 2 including support -means for said rotary solenoid, said abutment being secured to said support means.
  • a needle-threadwiping device adapted for use on a sewing machine having a frame, a thread-carrying needle supported in said frame for reciprocation in an endwise path, said thread-wiping device comprising in combination:
  • a linkage means including a crank and a link connecting said crank with said thread-wiping element, said linkage means having an over-center position defined by a mutually overlapping relationship of said link with said crank;
  • an energizing means operatively connected to said linkage means for selectively driving and retracting said linkage means, said energizing means
  • said energizing means References Cited UNITED STATES PATENTS 1,352,514 9/1920 Hill i12-252 1,358,847 11/1920 Hill 112-252 1,255,489 2/1918 Triem 112-252 1,332,683 3/1920 Ray 112-252 3,413,944 12/1968 Spinrad et al 112-252 MERVIN STEIN, Primary Examiner GEORGE H. KRIZMANICH, Assistant Examiner

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US780343A 1968-12-02 1968-12-02 Thread wiping device Expired - Lifetime US3494316A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US78034368A 1968-12-02 1968-12-02

Publications (1)

Publication Number Publication Date
US3494316A true US3494316A (en) 1970-02-10

Family

ID=25119331

Family Applications (1)

Application Number Title Priority Date Filing Date
US780343A Expired - Lifetime US3494316A (en) 1968-12-02 1968-12-02 Thread wiping device

Country Status (4)

Country Link
US (1) US3494316A (de)
DE (2) DE1960223A1 (de)
FR (1) FR2024988A1 (de)
GB (1) GB1240019A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0081289A1 (de) * 1981-10-27 1983-06-15 British United Shoe Machinery Limited Automatische Mehrnadelnähmaschine
US4550672A (en) * 1983-05-04 1985-11-05 Durkoppwerke Gmbh Thread-holding apparatus for buttonhole machine
US5025739A (en) * 1989-07-07 1991-06-25 Pegasus Sewing Machine Mfg., Co., Ltd. Needle thread wiper of sewing machine
US5027732A (en) * 1988-12-05 1991-07-02 Ssmc Inc. Thread end holding unit
WO2002000984A2 (en) * 2000-06-28 2002-01-03 Clinton Industries, Inc. Side mount thread wiper for a sewing machine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1255489A (en) * 1913-06-09 1918-02-05 United Shoe Machinery Corp Thread-cutting mechanism.
US1332683A (en) * 1915-07-17 1920-03-02 United Shoe Machinery Corp Sewing-machine
US1352514A (en) * 1916-08-28 1920-09-14 United Shoe Machinery Corp Sewing-machine
US1358847A (en) * 1916-07-24 1920-11-16 United Shoe Machinery Corp Sewing-machine
US3413944A (en) * 1965-10-01 1968-12-03 American Safety Table Co Thread severing attachment for sewing machine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1255489A (en) * 1913-06-09 1918-02-05 United Shoe Machinery Corp Thread-cutting mechanism.
US1332683A (en) * 1915-07-17 1920-03-02 United Shoe Machinery Corp Sewing-machine
US1358847A (en) * 1916-07-24 1920-11-16 United Shoe Machinery Corp Sewing-machine
US1352514A (en) * 1916-08-28 1920-09-14 United Shoe Machinery Corp Sewing-machine
US3413944A (en) * 1965-10-01 1968-12-03 American Safety Table Co Thread severing attachment for sewing machine

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0081289A1 (de) * 1981-10-27 1983-06-15 British United Shoe Machinery Limited Automatische Mehrnadelnähmaschine
US4550672A (en) * 1983-05-04 1985-11-05 Durkoppwerke Gmbh Thread-holding apparatus for buttonhole machine
US5027732A (en) * 1988-12-05 1991-07-02 Ssmc Inc. Thread end holding unit
US5025739A (en) * 1989-07-07 1991-06-25 Pegasus Sewing Machine Mfg., Co., Ltd. Needle thread wiper of sewing machine
WO2002000984A2 (en) * 2000-06-28 2002-01-03 Clinton Industries, Inc. Side mount thread wiper for a sewing machine
WO2002000984A3 (en) * 2000-06-28 2002-08-15 Clinton Ind Side mount thread wiper for a sewing machine
US6568339B1 (en) 2000-06-28 2003-05-27 Clinton Indusries, Inc. Side mount thread wiper for a sewing machine

Also Published As

Publication number Publication date
DE6946537U (de) 1970-08-06
FR2024988A1 (de) 1970-09-04
DE1960223A1 (de) 1970-11-19
GB1240019A (en) 1971-07-21

Similar Documents

Publication Publication Date Title
JPH10328462A (ja) 糸切り装置を用いて縫い糸を切断する方法およびこの方法を実施するためのミシン
US5065683A (en) Thread trimmer mechanism for sewing machines
US3115855A (en) Bobbin thread replenishing means in sewing machine loop taker
US3494316A (en) Thread wiping device
US3448708A (en) Thread wiper and thread end holder for sewing machines
ES8401546A1 (es) Disposicion de corte de hilos en maquinas de coser de doble pespunte.
US3173390A (en) Chain stitch device for lock stitch sewing machines
US4834010A (en) Reciprocating thread cutter for multi-needle looper thread type sewing machine
US4200050A (en) Thread cutting device for lockstitch sewing machines
US5289791A (en) Sewing machine with thread wiper and auxiliary cutter
EP2241662B1 (de) Fadenschneidevorrichtung für Nähmaschine
GB906397A (en) Lock stitch sewing machine
US3847102A (en) Needle thread wiper and pull-back mechanism for sewing machines
US3599588A (en) Thread-carrying looptaker for chain stitch sewing machines with thread catcher and clamping device
US1401465A (en) Thread-severing mechanism for sewing-machines
US3602170A (en) Thread cutter in sewing machine
US3867892A (en) Underbed thread trimmer for chainstitch sewing machines
US3512491A (en) Thread cutting mechanism for lockstitch sewing machines
GB928200A (en) Lock stitch sewing machines
JPH0734838B2 (ja) ルーパミシンの下糸把持装置
KR100186838B1 (ko) 2중 스텝 스티치 재봉틀에서 재봉초기에 바늘의 실단부를 단축시키는 방법 및 장치
US2335827A (en) Article attaching machine
US5375546A (en) Shortening of needle thread end at the beginning and end of sewing in lockstitch sewing machines
US4395961A (en) Underbed thread trimmer for horizontal axis hooks
US3695200A (en) Thread pull-off and wiping mechanism for sewing machines

Legal Events

Date Code Title Description
AS Assignment

Owner name: SSMC INC., A CORP. OF DE, CONNECTICUT

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SINGER COMPANY, THE;REEL/FRAME:005041/0077

Effective date: 19881202