US3570429A - Thread guide for a rotary-hook-type sewing machine - Google Patents

Thread guide for a rotary-hook-type sewing machine Download PDF

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Publication number
US3570429A
US3570429A US811854A US3570429DA US3570429A US 3570429 A US3570429 A US 3570429A US 811854 A US811854 A US 811854A US 3570429D A US3570429D A US 3570429DA US 3570429 A US3570429 A US 3570429A
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US
United States
Prior art keywords
underthread
bobbin case
cover
skid
sewing machine
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
US811854A
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English (en)
Inventor
Susanna Bolt
Harald Swifarth
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.)
Mefina SA
Original Assignee
Mefina SA
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 Mefina SA filed Critical Mefina SA
Application granted granted Critical
Publication of US3570429A publication Critical patent/US3570429A/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
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/08—Loop takers, e.g. loopers for lock-stitch sewing machines
    • D05B57/10—Shuttles
    • D05B57/14—Shuttles with rotary hooks
    • D05B57/143—Vertical axis type
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B63/00—Devices associated with the loop-taker thread, e.g. for tensioning

Definitions

  • ABSTRACT A blade or wire, mounted underneath the cover for the guard ring and in the path of the underthread on its way to the needle, is so shaped that when the sewer pulls the underthread tight, while threading the machine preparatory to sewing, it is caused to move under the tension skid automatically.
  • the invention relates to the combination in a rotary-hooktype sewing machine of a bobbin case carrying the underthread, a guard ring for holding the bobbin case, and an arrangement including a skid for adjusting the tension of the underthread.
  • this step is made entirely automatic.
  • An object of the invention is a guide means for automatically moving the underthread under the skid when the sewer pulls upon it while threading her rotary-hook-type sewing machine.
  • FIG. l is a transverse section through the lower arm of the sewing machine
  • FIG. 2 is a top view, partly cut away, of the front end of the lower arm
  • FIG. 3 is a longitudinal section of the front part of the lower arm.
  • FIG. 4 is a view similar to that of FIG. 3 but of another form of the invention, showing only the modified parts.
  • the sewing machine comprises a free lower arm 1 within which is arranged the feed mechanism for the cloth.
  • This mechanism is shown in the FIGS. only by the feed dog 3, the teeth of which project into openings 4 in the needle plate 5, which also has an elongated opening 6 to permit the needle 7 to move in its two extreme transverse positions when zigzag stitching.
  • the needle 7 is fixed at the end of the needle bar 2 which is driven by a mechanism held in the head of the sewing machine, the head not being shown.
  • a pressure foot 9 holds the cloth against the needle plate 5.
  • the arrangement for the underthread 10 includes a bobbin case 12, which is held in a guard ring composed of upper and lower guard rings 14 and 13, respectively.
  • the two parts 13 and 14 are held together by screws 15 and intermediate blade springs 16.
  • Defined between the parts 13 and 14 is a groove 17 that enables the guard ring 13 and 14 to be guided on an annular rib 13 incorporated by the cup-shaped rotary hook 19, the point of which the reference numeral 20.
  • the rotary hook 19 is carried by a shaft 21 arranged substantially vertically and continuously rotated when the sewing machine is running.
  • a retaining nose 22, held by screws against the upper guard ring M, holds the guard ring 13 and 14 in a fixed position within the rotary hook 19.
  • the nose 22 cooperates with a stop, which in the present instance forms part of a release device that opens up a space between the nose 22 and the stop of said device when the loop of needle thread encircles the bobbin case.
  • the thread 10 continues to the edge of this skirt and then passes under a skid 27 forming part of an arrangement for regulating the tension of the underthread.
  • a spring 28 the tension of which is controlled by a lever 29 pivoted at 30.
  • a tension-adjusting member 31 that can be turned about an axis and has an eccentric head 32 acts on the end 33 of the lever 29, and varies the tension of the spring 28 on the skid 27 when turned. After the thread 10 leaves the skid 27 it enters a slot 34 in the cylindrical skirt 26 and takes the path towards the needle 7.
  • a cover 35 positioned substantially coplanar with the needle plate 5, is arranged horizontally above the bobbin case 12 to the FIGS.
  • the cover 35 is mounted free to slide transversely with respect to the free lower arm 1.
  • the lower face of the cover carries two tongues 36, which engage respective rails 37 of the lower arm 1. These tongues are formed in either end of a metal strip 38 held against the lower face of the cover 35.
  • the cover carries an underthread guide 39 used while threading the machine preparatory to sewing.
  • the guide 39 consists of the edge of a blade 40 held at a slant under the cover 35.
  • the blade 40 is formed by a lateral prolongation of the metal strip 38, the prolongation being bent at an angle with respect to the strip.
  • An underthread guide slot 41 is incorporated in the edge 42 of the cover 35. The under thread 10 slides over the edge 42 while the sewing machine is being threaded.
  • the machine is threaded preparatory to sewing in the following manner:
  • the cover 35 is opened and a bobbin case 12 of underthread 10 is placed in the guard ring 13 and 14. Thereupon the thread 10 is threaded through the slot 25 of the skirt 26, the cover 35 pushed back over the bobbin case 12, and the thread run through the slot 41 in the cover edge 42.
  • the sewer now pulls on the thread 10 so as to stretch it tight between the slot 25 and the guide 39, thereby forcing it under the skid 27 (see FIG. 1).
  • the guide 39 therefore ensures, as already noted, that the underthread is correctly positioned in the tension regulator, of which the skid 27 forms one part. This much done, the first step of preparing the machine for sewing is completed.
  • the sewer must now pass the needle thread (not shown) through the eye of the needle 7 and then turn the handwheel manually until the needle has completed its first downward movement.
  • the rotary hook point 20 catches the needle thread guided by the needle and forms a loop which it encircles about the guard ring 13 and 14 and therefore about the bobbin case 12 of underthread 10.
  • the loop of needle thread at the same time grips the free end of the underthread 10.
  • the sewer next pulls on the end of the needle thread, causing both the loop, now closed, and the end of the underthread 10 to be brought up through the opening 6.
  • the ends of the two threads are then laid down flat on the needle plate 5, and the sewer can position them under the pressure foot 9 to make the desired stitch.
  • FIG. 4 shows a second form of the invention, in which the cover 35 is not slidingly mounted on the lower arm 1 but is hinged thereto by two arms 43.
  • the guide 39 consists in this case of a metal wire fixed at a slant between the lower face of the cover 35, and one of the hinge arms 43.
  • the guide 39 can consist of any suitable part mounted underneath the cover 35.
  • the invention as described with reference to the FIGS. of the drawing was applied to a sewing machine having a rotary hook rotating about a substantially vertical axis.
  • the guide 39 can also be employed, of course, in a sewing machine with a rotary hook turning on a horizontal axis or in one with any other arrangement of bobbin case and rotary hook. Instead of being mounted on the cover 35, the guide 39 can be carried by any other part of the lower arm 1, for example.
  • said cover has an edge over which the underthread slides on its way to the needle plate when the sewing machine is being threaded preparatory to sewing and when the machine is in use, said cover edge having a slot through which the underthread passes for guiding said underthread.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
  • Laminated Bodies (AREA)
US811854A 1968-04-18 1969-04-01 Thread guide for a rotary-hook-type sewing machine Expired - Lifetime US3570429A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH600368A CH473261A (fr) 1968-04-18 1968-04-18 Dispositif à canette et crochet rotatif pour machine à coudre

Publications (1)

Publication Number Publication Date
US3570429A true US3570429A (en) 1971-03-16

Family

ID=4302776

Family Applications (1)

Application Number Title Priority Date Filing Date
US811854A Expired - Lifetime US3570429A (en) 1968-04-18 1969-04-01 Thread guide for a rotary-hook-type sewing machine

Country Status (14)

Country Link
US (1) US3570429A (da)
JP (1) JPS4816213B1 (da)
AT (1) AT297463B (da)
BE (1) BE730827A (da)
BR (1) BR6907527D0 (da)
CH (1) CH473261A (da)
DE (1) DE1914516A1 (da)
DK (1) DK132452C (da)
ES (1) ES365694A1 (da)
FR (1) FR2006408A1 (da)
GB (1) GB1204096A (da)
IE (1) IE33026B1 (da)
NL (1) NL6904639A (da)
SE (1) SE362668B (da)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3895591A (en) * 1974-10-17 1975-07-22 Singer Co Thread cutting device
US5109782A (en) * 1989-10-23 1992-05-05 Brother Koygo Kabushiki Kaisha Cover plate and bobbin holder thread tensioning guides

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4105010A (en) * 1976-01-02 1978-08-08 Rand Jr Earl W Fuel saving apparatus for multiple cylinder internal combustion engines
US4365567A (en) * 1978-06-30 1982-12-28 The Singer Company Modified thread control lever for a bobbin case
FR3125865B1 (fr) 2021-07-29 2023-06-30 Actinov Dispositif de bruleur à éthanol faisant appel à un procédé de catalyse d’éthanol

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1188818A (en) * 1914-05-02 1916-06-27 Singer Mfg Co Rotary-hook sewing-machine.
US2232624A (en) * 1939-10-19 1941-02-18 Singer Mfg Co Bobbin-thread tension threading device for sewing machines
US2488052A (en) * 1944-01-27 1949-11-15 Mefina Sa Shuttle for sewing machines
US3011463A (en) * 1958-09-16 1961-12-05 Sanwa Mishin Seizo Kabushiki K Sewing machine work support including an improved quick opening needle plate and cover plate arrangement

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1188818A (en) * 1914-05-02 1916-06-27 Singer Mfg Co Rotary-hook sewing-machine.
US2232624A (en) * 1939-10-19 1941-02-18 Singer Mfg Co Bobbin-thread tension threading device for sewing machines
US2488052A (en) * 1944-01-27 1949-11-15 Mefina Sa Shuttle for sewing machines
US3011463A (en) * 1958-09-16 1961-12-05 Sanwa Mishin Seizo Kabushiki K Sewing machine work support including an improved quick opening needle plate and cover plate arrangement

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3895591A (en) * 1974-10-17 1975-07-22 Singer Co Thread cutting device
US5109782A (en) * 1989-10-23 1992-05-05 Brother Koygo Kabushiki Kaisha Cover plate and bobbin holder thread tensioning guides

Also Published As

Publication number Publication date
AT297463B (de) 1972-03-27
JPS4816213B1 (da) 1973-05-21
ES365694A1 (es) 1971-04-16
IE33026L (en) 1969-10-18
FR2006408A1 (da) 1969-12-26
CH473261A (fr) 1969-05-31
IE33026B1 (en) 1974-02-20
BR6907527D0 (pt) 1973-01-11
DK132452C (da) 1976-05-17
DE1914516A1 (de) 1969-10-30
DK132452B (da) 1975-12-08
SE362668B (da) 1973-12-17
BE730827A (da) 1969-09-01
NL6904639A (da) 1969-10-21
GB1204096A (en) 1970-09-03

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