US3641958A - Device for the occasional omission of backstitches on automatically controlled quilting and embroidery machines - Google Patents

Device for the occasional omission of backstitches on automatically controlled quilting and embroidery machines Download PDF

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Publication number
US3641958A
US3641958A US20658A US3641958DA US3641958A US 3641958 A US3641958 A US 3641958A US 20658 A US20658 A US 20658A US 3641958D A US3641958D A US 3641958DA US 3641958 A US3641958 A US 3641958A
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United States
Prior art keywords
lever
spring
thread
spring lever
takeup
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Expired - Lifetime
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US20658A
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English (en)
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Ludwig Trageser
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Individual
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Individual
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Publication of US3641958A publication Critical patent/US3641958A/en
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B81/00—Sewing machines incorporating devices serving purposes other than sewing, e.g. for blowing air, for grinding

Definitions

  • ABSTRACT A device for the occasional omision of backstitches on automatically controlled quilting and embroidery machines, particularly on automatic embroidery machines, in which a main thread takeup lever is controlled in such a way that it can be moved up and down about a fulcrum.
  • a spring lever is movable together with this main thread takeup lever and is mounted on the fulcrum thereof.
  • a torsion spring urges the spring lever against a stop mounted in a permanent position in the machine.
  • the upper thread in course of being unwound is additionally guided by the spring lever on the upstream side of the main thread takeup lever.
  • the spring lever is preceded by a blocking device which can be moved into the path of motion of said spring lever.
  • This invention relates to a device for the occasional omission of backstitches on automatically controlled quilting and embroidery machines, particularly on automatic embroidery machines, in which the main thread takeup lever is controlled in such a way that it can be moved up and down.
  • Automatic embroidery machines operate, like quilting machines, with an upper thread and a lower thread.
  • the lower thread is wound onto a bobbin and placed in a bobbin case with adjusting means for the thread-braking action (thread tension).
  • the bobbin case with the lower thread fits into a gripper system of which the purpose is to grip the upper thread loop forming on the needle and to force it round the bobbin case, thus tying the upper thread and the lower thread (forming a stitch).
  • a certain thread length is required for the loop of the upper thread, the said length being released by the descending movement of the takeup lever (thread lever) as soon as the point of the gripper has engaged the thread loop.
  • the thread lever pulls down the loop of the upper thread.
  • the invention aims at preventing the formation of a thread loop at the eye of the needle, when the embrodiery machine needle is in the lowest position, by automatically bringing about a considerable increase in the tension of the upper thread.
  • the present invention provides a device for the occasional omission of backstitches on automatically controlled quilting and embroidery machines, particularly on automatic embroidery machines, which comprises a main thread takeup lever so controlled that is can move up and down about a fulcrum in a machine head; a spring lever movable together with said main thread takeup lever and mounted on the fulcrum thereof, and a torsion spring urging said spring lever against a stop mounted in a permanent position in said machine head, an upper thread in course of being unwound being additionally guided by the spring lever on the upstream side of the main thread takeup lever and the spring lever being preceded by a blocking device capable of being moved into the path of motion of said spring lever.
  • the blocking device may comprise a controllable lifting magnet and a supporting lever influenced by said lifting magnet and equipped with a restoring spring, said supporting lever being swingable about a pivot and preventing said spring lever from moving.
  • the torsion spring of the spring lever is preferably made adjustable to the thread thickness and to the type of stitch.
  • FIG. I is a side view of an embroidery head in the position for the formation of a stitch
  • FIG. 2 is a side view of the embroidery head in the position for the omission of stitches
  • FIG. 3 is a front view of the embroidery head as shown in FIG. 2.
  • the movement between the needle 12 and the gripper I4 is coordinated in such a way that for the formation of stitches the point 20 of the gripper l4 takes up the loop formed in the upper thread by the needle l2, in which process the gripper I4 rotates in the direction shown by the arrow l9.
  • the needle I2 is secured in a needle bar II, with which it performs a to-and-fro movement.
  • a main thread takeup lever 2 is pivotally mounted on fulcrum I which in turn is mounted in the machine head 22.
  • the takeup lever 2 is moved up and down by a cam 21 driven control shaft l5 of the embroidery machine, which cam is engaged by a cam follower 23 attached to the takeup lever 2.
  • a spring lever 5 is also mounted on the fulcrum I and is biased by a torsion spring 3 towards a stop 4 mounted in a fixed position in the machine head.
  • the tension in the tension spring 3 may be adjusted by a thumb screw 24.
  • Selected backstitches are omitted by blocking means.
  • a lifting magnet 10 is supplied, when the main thread takeup lever 2 is in the highest position, with a control impulse, the core 16 of the magnet I0 then being retracted toward the right as viewed in FIG. I causing the end I7 ofa supporting lever B pivotably mounted at 7 to be rotated and the free end I8 of the lever to be pivoted into the path of motion of the spring lever 5.
  • the descending movement of the spring lever 5 which is parallel to the main thread takeup lever 2 is then prevented, and the considerably increasing force of the spring lever 5 keeps the upper thread in the lowest needle position (FIG. 3) so taut that no thread loop can form at the eye of the needle I2, any connection forming a stitch between the upper and lower thread thus likewise being impossible.
  • the stitch omission process is terminated as soon as the lifting magnet [0 receives appropriate control impulses and returns to its initial position.
  • the supporting lever 8 will then have been tilted out of the path of movement of the spring lever 5 by means of a restoring spring 9.
  • the control impulses for the lifting magnet are provided, in a manner known per se, by ajacquard card controlling the embroidery machine, or by similar means.
  • a device for the occasional omission of backstitches on automatically controlled quilting and embroidery machines, particularly on automatic embroidery machines, comprising a. a main thread takeup lever so controlled that it can move up and down about a fulcrum in a machine head;
  • a torsion spring urging said spring lever against a stop mounted in a permanent position in said machine head, an upper thread in course of being unwound being guided by the main thread takeup lever and the spring lever located on the upstream side of the main thread takeup lever, and
  • a blocking device capable of being moved into and out of the path of motion of said spring lever.
  • the blocking device comprises a controllable lifting magnet and a supporting lever influenced by said lifting magnet and equipped with a restoring spring said supporting lever being swingable about a pivot and preventing said spring lever from moving when in the path of motion ofsaid spring lever.
  • a device for causing omission of backstitches on automatic embroidery machines comprising a. means supporting a needle b. a takeup lever for supporting the thread to the point of said needle and movable towards and away from the point of said needle c. a spring lever movable with said takeup lever for supporting said thread between said takeup lever and needle, and

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US20658A 1969-06-06 1970-03-18 Device for the occasional omission of backstitches on automatically controlled quilting and embroidery machines Expired - Lifetime US3641958A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691928811 DE1928811A1 (de) 1969-06-06 1969-06-06 Vorrichtung zum zeitweisen Auslassen von Steppstichen an automatisch gesteuerten Stickmaschinen

Publications (1)

Publication Number Publication Date
US3641958A true US3641958A (en) 1972-02-15

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ID=5736245

Family Applications (1)

Application Number Title Priority Date Filing Date
US20658A Expired - Lifetime US3641958A (en) 1969-06-06 1970-03-18 Device for the occasional omission of backstitches on automatically controlled quilting and embroidery machines

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US (1) US3641958A (de)
DE (1) DE1928811A1 (de)
FR (1) FR2045467A5 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4590879A (en) * 1983-11-15 1986-05-27 Tokyo Juki Industrial Co., Ltd. Thread feed device in a sewing machine
US4856443A (en) * 1987-05-15 1989-08-15 Okamura & Co. Needle thread tensioning device for a swing machine
US5495816A (en) * 1993-09-10 1996-03-05 Rimoldi Necchi S.R.L. Multi-needle sewing machine with thread tension control
US5899156A (en) * 1996-05-04 1999-05-04 Union Special Gmbh Thread control device for a chainstitch sewing machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62170289A (ja) * 1986-01-21 1987-07-27 ブラザー工業株式会社 ミシンの糸取上装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2083095A (en) * 1935-02-19 1937-06-08 Rosenman Herman Method of skipping or slipping of stitches with a sewing machine
US2099574A (en) * 1935-04-19 1937-11-16 Rosenman Herman Slip stitch sewing machine
US3428009A (en) * 1964-11-27 1969-02-18 Borletti Spa Basting device for sewing machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2083095A (en) * 1935-02-19 1937-06-08 Rosenman Herman Method of skipping or slipping of stitches with a sewing machine
US2099574A (en) * 1935-04-19 1937-11-16 Rosenman Herman Slip stitch sewing machine
US3428009A (en) * 1964-11-27 1969-02-18 Borletti Spa Basting device for sewing machine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4590879A (en) * 1983-11-15 1986-05-27 Tokyo Juki Industrial Co., Ltd. Thread feed device in a sewing machine
US4856443A (en) * 1987-05-15 1989-08-15 Okamura & Co. Needle thread tensioning device for a swing machine
US5495816A (en) * 1993-09-10 1996-03-05 Rimoldi Necchi S.R.L. Multi-needle sewing machine with thread tension control
US5899156A (en) * 1996-05-04 1999-05-04 Union Special Gmbh Thread control device for a chainstitch sewing machine

Also Published As

Publication number Publication date
FR2045467A5 (de) 1971-02-26
DE1928811A1 (de) 1970-12-10

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