US3602171A - Thread cutting device for sewing machines - Google Patents

Thread cutting device for sewing machines Download PDF

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Publication number
US3602171A
US3602171A US865715A US3602171DA US3602171A US 3602171 A US3602171 A US 3602171A US 865715 A US865715 A US 865715A US 3602171D A US3602171D A US 3602171DA US 3602171 A US3602171 A US 3602171A
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US
United States
Prior art keywords
presser foot
knife
feed plate
under surface
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
US865715A
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English (en)
Inventor
Rolf Ake Claesson
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.)
J A PETERSON AND CO AB
Original Assignee
J A PETERSON AND CO AB
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 J A PETERSON AND CO AB filed Critical J A PETERSON AND CO AB
Application granted granted Critical
Publication of US3602171A publication Critical patent/US3602171A/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
    • D05B65/00—Devices for severing the needle or lower thread
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B29/00—Pressers; Presser feet
    • D05B29/06—Presser feet
    • 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
    • D05D2207/00—Use of special elements
    • D05D2207/02—Pneumatic or hydraulic devices

Definitions

  • a thread cutting device for sewing machines 2 claims 2 Drawing g comprises an exclusively cutting knife mounted for displacement behind the needle axis upon release of a driving impulse [52] US. Cl 112/252 independent on the drive mechanism of the machine, a knife [5
  • ROLF 4K5 CLAsso- 'rnREAn CUTTING DEVICE FOR SEWING MACHINES This invention relates to a thread cutting device for sewing machines comprising an exclusively cutting knife mounted for displacement behind the needle axis upon release of a driving impulse independent of the drive mechanism of the machine.
  • Devices of this kind consist of a support for a knife mounted above the feed plate and behind the presser foot, which knife can be moved by means of a pneumatic or electric driving mechanism towards and against the feed plate for cutting the thread thereon.
  • the invention concerns a device which brings an essential reduction of the danger of accidents which does not hinder the feeding of the work on the machine and which produces an automatic lifting of the presser foot.
  • the device according to the present invention can further easily be mounted on existing machines. I
  • a knife support and the knife are mounted V beneath the feed plate and are movable upwards through an opening in the feed plate to cooperate with the presser foot behind the needle axis.
  • the presser foot is preferably provided wards to its lifted position normal for the beginning of a new seam, the presser foot being maintained in said lifted position by a known catch.
  • FIG. I is an elevational section through the feedplate with the presser foot and the knife in position for sewing work.
  • FIG. 2 shows the device in the position for cutting the thread.
  • 1 shows the presser foot which is mounted for limited rotation on a support 2 on the lower end of a presser bar 3 which in a known manner is displaceable upwards against spring action and which can be kept in its lifted position illustrated in FIG. 2 by a catch, not shown.
  • the needle 4 is equally in a known manner mounted on the lower end of a needle bar 5.
  • the presser foot normally rests against a feed plate 6 beneath which known feed and shuttle mechanisms are shown of which only the shuttle is diagrammatically shown at 7.
  • the presser foot 1 of the illustrated embodiment has an extension 8 projecting rearwards, i.e. in the feed direction (to the left in FIGS. 1 and 2) and presenting an under surface which .is retracted relative to the pressure surface of the presser foot I.
  • a bracket 9 mounted on the machine frame piston rod 1l any appropriate hydraulic, electric or mechanical driving means can be used for the knife dependent on the power sources available in each special case.
  • the driving impulses can consist of contacts or valves which are operated by the operator with the hand, the knee or the foot, e.g. of an extra contact operated by the ordinary regulating pedal when swung backwards (with the heel downwards).
  • the releasing of the driving impulse for the knife can also be effected automatically dependent on the other functions of the machine or on the position of the work, e.g. by built-in contacts or valves, photocells, fluidistors etc.
  • the invention is not either in other aspects limited to the embodiment described and illustrated in the drawing. While the knife has been described as a member mounted for parallel motion, it can also be formed of the angularly bent end of a rockatable lever which can be operated directly or indirectly byany driving means, e.g. by a horizontal electromagnet mounted under the feed plate which actions the knife lever by means of a bellcrank lever, a cam or the like.
  • the device according to the invention can thus very easily be adapted to the space available beneath the feed plate in any sewing machine.
  • a sewing machine having a feed plate for supporting thereon material to. be sewed, a presser foot for pressing said material against said feed plate, the presser foot having a rearwardly extending portion that has an under surface that is stepped upward above that portion of the presser foot that engages said material, and a needle for sewing the thread through said material; the improvement in which said feed plate has a narrow opening therethrough disposed rearwardly of the axis of said needle and beneath said under surface of said presser foot, and a thread cutter mounted on the sewing machine and movable upwardly and downwardly through said opening into and out of engagement with said under surface to

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US865715A 1968-10-14 1969-10-13 Thread cutting device for sewing machines Expired - Lifetime US3602171A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE13823/68A SE324942B (fr) 1968-10-14 1968-10-14

Publications (1)

Publication Number Publication Date
US3602171A true US3602171A (en) 1971-08-31

Family

ID=20298055

Family Applications (1)

Application Number Title Priority Date Filing Date
US865715A Expired - Lifetime US3602171A (en) 1968-10-14 1969-10-13 Thread cutting device for sewing machines

Country Status (5)

Country Link
US (1) US3602171A (fr)
BE (1) BE757327Q (fr)
DE (1) DE1951526A1 (fr)
FR (1) FR2020677A1 (fr)
SE (1) SE324942B (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3136276A (en) * 1962-12-06 1964-06-09 Miyake Kiyoyuki Thread cutting device for sewing machines
US3215106A (en) * 1962-04-11 1965-11-02 Necchi Spa Device for cutting and holding the threads of a sewing machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3215106A (en) * 1962-04-11 1965-11-02 Necchi Spa Device for cutting and holding the threads of a sewing machine
US3136276A (en) * 1962-12-06 1964-06-09 Miyake Kiyoyuki Thread cutting device for sewing machines

Also Published As

Publication number Publication date
FR2020677A1 (fr) 1970-07-17
SE324942B (fr) 1970-06-15
DE1951526A1 (de) 1970-06-11
BE757327Q (fr) 1971-03-16

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