US2858786A - Thread cutting device for single thread chain stitch sewing machine - Google Patents

Thread cutting device for single thread chain stitch sewing machine Download PDF

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Publication number
US2858786A
US2858786A US687199A US68719957A US2858786A US 2858786 A US2858786 A US 2858786A US 687199 A US687199 A US 687199A US 68719957 A US68719957 A US 68719957A US 2858786 A US2858786 A US 2858786A
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US
United States
Prior art keywords
looper
auxiliary
shaft
lever
thread
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
US687199A
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English (en)
Inventor
Benink Christiaan Jose Marinus
Dobner Reinhold
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
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GM Pfaff AG
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Publication date
Application filed by GM Pfaff AG filed Critical GM Pfaff AG
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Publication of US2858786A publication Critical patent/US2858786A/en
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B27/00—Work-feeding means
    • D05B27/02—Work-feeding means with feed dogs having horizontal and vertical movements
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B65/00—Devices for severing the needle or lower thread
    • 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
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B73/00—Casings
    • D05B73/04—Lower casings
    • D05B73/12—Slides; Needle plates
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2303/00—Applied objects or articles
    • D05D2303/12—Rigid objects
    • D05D2303/14—Buttons

Definitions

  • FIG-E lNVENTORS (br/Isfiaarr ⁇ Zxseph Mar/nus BfN/N/s and Reinhold .DOBNEP Nov. 4, 1958 c. J. M. BENINK EIAL 2,858,785
  • the present invention relates to single thread chain stitch sewing machines and is particularly concerned with a thread cutting device for single thread chain stitch sewing machines having a guided auxiliary looper.
  • the auxiliary looper is provided with a thread cutter which, after the auxiliary looper having been shifted from its loop catching position to severing position becomes operative by a pivotal movement of the auxiliary looper.
  • the guiding of the auxiliary looper carrying the thread cutter may take place by the stopping mechanism in a manner to cause automatic thread cutting.
  • a thread cutting device for single thread chain stitch sewing machines of the type having an auxiliary looper is characterized in that the auxiliary loo-per is provided with a thread cutter which, after the auxiliary looper has been moved from its loop catching position into cutting position, becomes operative by the rocking movement of the auxiliary looper.
  • FIG. 1 is an elevational view of a chain stitch sewing machine taken from the left side, partly in cross section,
  • Fig. 2 is a view of the machine from the operating end
  • Fig. 3 is a fractional view taken from the right side of the machine
  • Fig. 4 is a perspective view showing details of the thread cutting device
  • Fig. 5 is a top view of the auxiliary looper
  • Fig. 6 illustrates the auxiliary looper in loop catching position of operation
  • Fig. 7 shows it in the thread cutting position of operation.
  • the machine illustrated in the drawings comprises a base 1, support arm 2, standard 3, arm 4 and head 5 of a single thread chain stitch machine.
  • the rotary shaft 6 with the chain stitch looper 7 at its forward end United States Patent 6 ice is mounted on the support arm 2 with the auxiliary looper cam 8 disposed below the standard 3.
  • the auxiliary cam lever 10, biased by means of spring 11 against the cam 8 is clamped onto the shaft 9 of the auxiliary looper.
  • a guiding groove disk 12 (Figs. 2 and 3) provided with shut off cams 13 which cooperate with follow r member 14 of the switch lever 15 is mounted on the right side of the machine.
  • a catch or pawl 16 is supported on the switch lever 18 and cooperates with the lock member 17 'of the switch lever 18 of the machine.
  • the belt guide 19 adapted to shift the drive belt 20 either to the idler pulley 21 or to the drive pulley 22 is connected together with the lock member 23 to the switch lever 18.
  • Supported on drive pulley 22 is a brake disk 24 provided at its tapering side 25' with a groove 25 which cooperate with the lock member 23 for braking and stopping operations.
  • auxiliary looper 26 is secured to auxiliary looper shaft 9 and is provided in a known manner with a book 27 secured to auxiliary looper 26 by means of a screw 28 which also secures a cutter 29 to the auxiliary looper on the side opposite to that on which the hook 27 is mounted (Fig.5).
  • the auxiliary looper shaft 9 is axially movable in the bearing sleeves 30, 31 and 32 which are provided in the support arm 2.
  • a lock ring 33 is secured to the shaft 9 which is biased by a spring 34 against the bearing sleeve 32.
  • the end of the auxiliary looper shaft 9 which is received in the bearing shell 30 at the rear projects from the base 1 and presents an abutment 35 (Fig. 4).
  • the end of the shaft carries a rotatable dog 36 which is provided with a recess 37 for an abutment key 35 and presents an abutment edge 38 for moving the auxiliary drive shaft 9 by way of key 35.
  • An an'gularly shaped sheet metal member 39 secured to the base 1 is provided to secure the dog 36 which abuts sleeve 30 against displacement axially of the auxiliary shaft 9.
  • a link 41 is pivotally connected at one end by way of a collar screw 40 to the dog 36 and is biased by means of a tension spring 42.
  • the other end of the link 41 is pivotally connected by means of collar screw 44 to a leg of a bellcrank lever 43, the other leg of which is provided with a bore 45 which threadedly receives a set screw 46 which projects into the path of operation of switch lever 18 and is secured against rotation by means of a. lock nut 47.
  • Bellcrank lever 43 is pivotally mounted by means of a collar screw 48 on a bracket 49 secured to base 1.
  • An angular support member 50 is threadedly secured to the base 1 and a two armed lever 51 is mounted for pivotal movement on said member by means of collar screw 52.
  • One arm-of the lever 51 has a bore 53 which receives an adjustable screw 55 secured by a lock nut 54 against rotation in a manner that its head is adapted to engage the front end of the auxiliary drive shaft 9 while the other end of the lever 51 is provided with an abutment end 56.
  • a double armed lever 57 is pivotally mounted on the extended shaft 58 of the switch lever 18 and presents an abutment plane 59 on its downwardly directed arm which is adapted to engage the abutment 56.
  • the upwardly extending arm of lever 57 is biased by a tension spring 60, one end of which is connected to a hook 61 on the standard while the other end is placed around a screw 62 in the upper arm of lever 57.
  • An angular member 63 is threadedly secured to switch lever 18 a set screw being secured to said member by a lock nut 64 against which rests the arm of lever 57 under the tension of the spring 60.
  • the illustrated embodiment of the invention operates l as follows: After the automatic disconnecting the shut off cam 13 has come to rest immediaely behind the follower member 14. In order to switch on the machine the switch lever 18 is moved clockwise as seen in Fig. l, or counterclockwise as seen in Fig. 3, and causes the machine to operate by way of the belt guide 19 and move lock member 17 to engage catch 16 from below to hold the lever 18 in position of operation. During'the ensuing series of stitches the guiding groove disk 12 continues to rotate slowly.
  • the looper shaft 6 applies oscillatory movements to the auxiliary looper shaft 9 and thereby to the auxiliary looper 26 which, under the pressure applied by spring 34 upon the set ring 33 of auxiliary shaft 9 is held in its loop catching position (Fig. 6).
  • the auxiliary looper 2 6 with its hook 27 grips the loop 67 formed by the previous stitch which is still held by the looper 7 and moves it aside.
  • the needle 66 in moving downwardly safely meets the triangle formed by the thread so that the loop 68 newly formed during the upward movement of the needle can be gripped by the looper 7 and drawn through the preceding loop 67.
  • the abutment 35 on the auxiliary looper shaft 9 is then outside the recess 37 of the rotatable dog 36.
  • the double armed levers 57 and 51 are in idling position.
  • the machine is switched off in a known manner by means of the shut off cams 13 (Fig. 3) on the guiding groove disk 12 which press down the switch lever 15 which causes the catch 16 to slip off the lock member 17 while the lock member 23 of the lever 18 contacts the raised portion of the brake disk 24 during the last half rotation of the drive shaft.
  • Thread cutting device for single thread chain stitch sewing machine of the type comprising a material support plate having a needle aperture, a drive shaft, a guiding disk for controlling'th'e operation of the machine-including carn means, abrake disk disposed endwise of said drive shaft havinga raised tapering portion and a slot, a doublearmed switch lever having a lock member at one end of one arm and having the other arm disposed in operative relation to said brake disk, a control lever in operative engagement at one end with said guiding disk and provided at the other end with a member adapted to interlock withsaid lock member, a looper mounted below said aperture endwise of a looper shaft disposed in the base of the machine and geared to said drive shaft, an auxiliary looper disposed adjacent said looper in operative relation thereto and mounted for rocking motion endwise of an auxiliary shaft disposed proximate said looper shaft, said auxiliary shaft including a spring biasing said auxiliary shaft in position of normal operatioma cam on" said looper shaft and a cam lever
  • Thread cutting device for single thread chain stitch sewing machine of the type comprising a material support plate having a needle aperture, a drive shaft, a guiding disk for controlling the operation of the machine including cam'means, a brake disk disposed endwise of said drive shaft having a raised tapering portion and a slot, a double armed switch lever having a lock member at one end of one arm and having the other arm disposed in operative relation to said brake disk, a control lever in operative engagement at one end with said guiding disk and provided at'the other end with a member adapted to interlock with said lock member, a looper mounted below said aperture endwise of a looper shaft disposed in the base of the machine and geared to said drive shaft, an auxiliary looper disposed adjacent said looper in operative relation thereto and mounted for rocking motion endwise of an auxiliary shaft disposed proximate said looper shaft, said auxiliary shaft including a spring biasing said auxiliary shaft in position of normal operation, a cam on said looper shaft and a cam lever on said auxiliary
  • Thread cutting device for single thread chain stitch sewing machine of the type comprising a material support plate having a needle aperture, a drive shaft, a guiding disk for controlling the operation of the machine including cam means, a brake disk disposed endwise of said drive shaft having a raised tapering portion and a slot, a double armed switch lever having a lock member at one end of one arm and having the other arm disposed in operative relation to said brake disk, a control lever in operative engagement at one end with said guiding disk and provided at the other end with a member adapted to interlock with said lock member, a looper mounted below said aperture endwise of a looper shaft disposed in the base of the machine and geared to said drive shaft, an auxiliary looper disposed adjacent said looper in operative relation thereto and mounted for rocking motion endwise of an auxiliary shaft disposed proximate said looper shaft, said auxiliary shaft including a spring biasing said auxiliary shaft in position of normal operation, a cam on said looper shaft and a cam lever on said auxiliary shaft for impart

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US687199A 1956-10-11 1957-09-30 Thread cutting device for single thread chain stitch sewing machine Expired - Lifetime US2858786A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP17173A DE1060228B (de) 1956-10-11 1956-10-11 Einfaden-Kettenstichnaehmaschine

Publications (1)

Publication Number Publication Date
US2858786A true US2858786A (en) 1958-11-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
US687199A Expired - Lifetime US2858786A (en) 1956-10-11 1957-09-30 Thread cutting device for single thread chain stitch sewing machine

Country Status (5)

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US (1) US2858786A (da)
DE (1) DE1060228B (da)
DK (1) DK91002C (da)
FR (1) FR1181637A (da)
GB (1) GB832726A (da)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3141432A (en) * 1962-04-26 1964-07-21 Pfaff Ag G M Thread-trimming mechanism for sewing machines
US3173393A (en) * 1961-12-13 1965-03-16 Pfaff Ag G M Thread cutting mechanism for lockstitch sewing machines
US3173392A (en) * 1961-08-11 1965-03-16 Pfaff Ag G M Thread trimming mechanism for lock stitch sewing machines
US4165700A (en) * 1978-10-30 1979-08-28 Union Special Corporation Thread separating finger
US4461229A (en) * 1981-04-29 1984-07-24 Pfaff Industriemaschinen Gmbh Device for pulling out and cutting off threads in a sewing machine
CN102162180A (zh) * 2010-02-17 2011-08-24 埃米施图茨纳克缝纫机有限两合公司 用于操作缝纫机的方法和缝纫机

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4315802C2 (de) * 1993-05-13 1995-05-11 Stutznaecker Emil Naehmasch Vielnadel-Doppelkettenstichnähmaschine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1228871A (en) * 1913-02-07 1917-06-05 Singer Mfg Co Thread-cutting mechanism for sewing-machines.
US1251451A (en) * 1914-04-01 1917-12-25 Singer Mfg Co Thread-cutting mechanism.
US1291335A (en) * 1918-04-18 1919-01-14 Singer Mfg Co Thread-cutting mechanism for sewing-machines.
US1514609A (en) * 1923-02-20 1924-11-11 Singer Mfg Co Stitch-forming mechanism for sewing machines
US2247570A (en) * 1939-02-02 1941-07-01 Singer Mfg Co Looper mechanism for sewing machines
US2335827A (en) * 1942-01-07 1943-11-30 Singer Mfg Co Article attaching machine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2131387A (en) * 1936-02-19 1938-09-27 Reece Button Hole Machine Co Button sewing machine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1228871A (en) * 1913-02-07 1917-06-05 Singer Mfg Co Thread-cutting mechanism for sewing-machines.
US1251451A (en) * 1914-04-01 1917-12-25 Singer Mfg Co Thread-cutting mechanism.
US1291335A (en) * 1918-04-18 1919-01-14 Singer Mfg Co Thread-cutting mechanism for sewing-machines.
US1514609A (en) * 1923-02-20 1924-11-11 Singer Mfg Co Stitch-forming mechanism for sewing machines
US2247570A (en) * 1939-02-02 1941-07-01 Singer Mfg Co Looper mechanism for sewing machines
US2335827A (en) * 1942-01-07 1943-11-30 Singer Mfg Co Article attaching machine

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3173392A (en) * 1961-08-11 1965-03-16 Pfaff Ag G M Thread trimming mechanism for lock stitch sewing machines
US3173393A (en) * 1961-12-13 1965-03-16 Pfaff Ag G M Thread cutting mechanism for lockstitch sewing machines
US3141432A (en) * 1962-04-26 1964-07-21 Pfaff Ag G M Thread-trimming mechanism for sewing machines
US4165700A (en) * 1978-10-30 1979-08-28 Union Special Corporation Thread separating finger
US4461229A (en) * 1981-04-29 1984-07-24 Pfaff Industriemaschinen Gmbh Device for pulling out and cutting off threads in a sewing machine
CN102162180A (zh) * 2010-02-17 2011-08-24 埃米施图茨纳克缝纫机有限两合公司 用于操作缝纫机的方法和缝纫机
EP2360305A1 (de) * 2010-02-17 2011-08-24 Nähmaschinenfabrik Emil Stutznäcker GmbH & Co. KG Verfahren zum Betrieb einer Nähmaschine und Nähmaschine
CN102162180B (zh) * 2010-02-17 2014-12-17 埃米施图茨纳克缝纫机有限两合公司 用于操作缝纫机的方法和缝纫机

Also Published As

Publication number Publication date
FR1181637A (fr) 1959-06-17
GB832726A (en) 1960-04-13
DE1060228B (de) 1959-06-25
DK91002C (da) 1961-05-29

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