WO2008102968A1 - Dispositif à navette rotative pour machines à coudre pourvu d'un pare-fil de dessous - Google Patents

Dispositif à navette rotative pour machines à coudre pourvu d'un pare-fil de dessous Download PDF

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Publication number
WO2008102968A1
WO2008102968A1 PCT/KR2008/000959 KR2008000959W WO2008102968A1 WO 2008102968 A1 WO2008102968 A1 WO 2008102968A1 KR 2008000959 W KR2008000959 W KR 2008000959W WO 2008102968 A1 WO2008102968 A1 WO 2008102968A1
Authority
WO
WIPO (PCT)
Prior art keywords
bobbin case
under thread
case base
hook
sidewall
Prior art date
Application number
PCT/KR2008/000959
Other languages
English (en)
Inventor
Sang Cheol Lee
Kwang Ok Koh
Original Assignee
Kobest Co., Ltd.
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 Kobest Co., Ltd. filed Critical Kobest Co., Ltd.
Publication of WO2008102968A1 publication Critical patent/WO2008102968A1/fr

Links

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
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/26—Bobbin holders or casings; Bobbin holder or case guards; Bobbin discharge devices

Definitions

  • the present invention relates, in general, to rotary shuttle devices for sewing machines and, more particularly, to a rotary shuttle device for sewing machines, in which an under thread guard protrudes from an end of the sidewall of a bobbin case base so as to guide an under thread and prevent the under thread from being hooked by a hook body, thus preventing the under thread from being hooked by a first hook of the hook body and preventing both abrupt cutting of the under thread and interruption of sewing work, thereby causing the sewing work to progress continuously and satisfactorily and increasing the productivity of sewing work.
  • a conventional sewing machine is provided with a rotary shuttle device 100 for the supply of under thread.
  • the rotary shuttle device 100 comprises a hook body 20, which is mounted to a drive shaft 10, rotatably coupled to a drive unit, and is called an "outer hook” in the art, a bobbin case BC, received in the hook body 20, and a bobbin 40 with an under thread wound around the bobbin 40.
  • the bobbin case BC comprises a bobbin case base 30, which is received in the hook body 20 and is called an "inner hook", and a bobbin case body 50 for holding the bobbin 40 at a location outside the bobbin case base 30.
  • a stud 31 is axially provided at the center of the bottom of the bobbin case base 30 such that it is perpendicular to the bottom.
  • the bobbin 40 is rotatably fitted over the stud 31.
  • a track groove 21 is formed in the inner surface of the hook body 20, and a first hook 22 is formed in one end of the track groove 21.
  • a cutout 23, having a gentle radius of curvature, is formed in the sidewall of the hook body 20 at a location near the first hook 22, such that the under thread can pass by the cutout 23 while being in contact therewith.
  • the bobbin case base 30 is provided around the sidewall thereof with a track rim 32, which is inserted into the track groove 21 in the hook body 20.
  • the bobbin case base 30 is rotatably installed in the hook body 20.
  • a semicircular gib 25 is mounted to half of the outer circumferential part of the hook body 20 using a locking member, such as a locking bolt. Due to the gib 25, the bobbin case base 30 can be rotatably installed in and removed from the hook body 20.
  • the gib 25 is provided with a second hook 25a, corresponding to the first hook 22 of the hook body 20.
  • an under thread guard 26 is detachably mounted to the remaining half of the outer circumferential part of the hook body 20 using a locking member, such as a locking bolt, such that the under thread guard 26 and the gib 25 are arranged in succession.
  • the under thread guard 26 is provided with a third hook 26a, which corresponds to the second hook 25 a of the gib 25.
  • a hook holder bracket 2 is installed in the body of the sewing machine and is inserted into a holding slot 33 in the bobbin case base 30, thus holding the bobbin case BC so as to prevent the bobbin case BC from moving.
  • a needle passing hole 34 is formed in the bobbin case base 30 at a location near the holding slot 33, and allows a needle to pass therethrough when the needle descends.
  • the bobbin 40 comprises a winding shaft 41, around which the under thread is wound, and opposite flanges 43 and 45, formed in both ends of the winding shaft 41.
  • the hook body 20 When the sewing machine is operated, the hook body 20 is rotated and, at the same time, both a needle and a thread take-up lever (not shown) for the upper thread execute respective vertical reciprocations. While the hook body 20 is rotated two times, the upper thread needle hooks and lifts the under thread once and pulls a predetermined length of under thread by a thread take-up action, thus preparing for the next under thread hooking and lifting action.
  • FIG. 2 is a view illustrating a needle in a state in which the needle has been lowered to be hooked by the hook body.
  • FIG. 3 is a view illustrating the moment that the hook body hooks the upper thread.
  • FIG. 4 is a side view of FIG. 3.
  • FIG. 5 through FIG. 10 are views sequentially illustrating sewing work, in which the drawings accompanied by the characters a, b, c, d, e and f show the rotary shuttle device in front views, and the drawings accompanied by the apostrophized characters a', b', c', d', e' and f show the rotary shuttle device in perspective views with the hook body 20 inverted such that the bottom thereof faces upwards for easy comprehension of the construction thereof.
  • the hook body 20 is rotated in response to the lowering action of the needle 2, so that the first hook 22 of the hook body 20 hooks and pulls the upper thread downwards (see FIG. 2 through FIG. 6).
  • the above-mentioned action of the first hook 22 of the hook body 20 is realized using a notch 2a, which is formed in one side surface of the needle 2 such that the first hook 22 can hook and pull the upper thread 3, running through the needle 2, downwards.
  • the needle 2 and the first hook 22 are spaced excessively far apart from each other, the first hook 22 may fail to hook the upper thread 3, thus skipping over one or more stitches on the sewing line or failing to executing the sewing.
  • the needle 2 and the first hook 22 are excessively close to each other, the needle 2 may collide with the first hook 22 and may break.
  • the formation of the noose formed by the upper thread 3, which surrounds the bobbin case BC, is realized by the thread take-up lever, which has pulled a predetermined length of upper thread in a previous stroke.
  • the length of the upper thread, which has been pulled by the thread take-up lever while the lever reciprocates once, is equal to the length of the thread which is required to surround the bobbin case BC during one rotation of the hook body 20. If the volume of the hook body 20, which has a close relationship with the volume of the under thread, is increased, the length of the upper thread pulled by the thread take-up lever becomes short, so that the upper thread may be cut. Conversely, if the length of the upper thread pulled by the thread take-up lever exceeds a predetermined length so that surplus thread is present, the under thread cannot be tensioned, thus causing a loop phenomenon or a towel phenomenon, in which the under thread becomes loose on the sewing line and forms a fine nap thereon.
  • the under thread 4 may be hooked between the first hook 22 of the hook body 20 and the third hook 26a of the under thread guard 26, as shown in FIG. 11.
  • the hook body 20 is rotated in the above state, the under thread 4 is inserted into and caught by the gap between the hook body 20 and the bobbin case base 30, and thus the under thread may be cut during the first rotation of the hook body 20, resulting in the interruption of sewing work and reducing the productivity of the sewing work. Disclosure of Invention Technical Problem
  • the present invention has been made keeping in mind the above problems occurring in the related art, and is intended to provide a rotary shuttle device for sewing machines, in which an under thread guard for guiding an under thread so as to prevent the under thread from being hooked by a hook body protrudes from one end of the sidewall of a bobbin case base, thus preventing the under thread from being hooked by a first hook of the hook body and preventing both abrupt cutting of the under thread and interruption of sewing work, thereby enabling the sewing work to progress continuously and satisfactorily and increasing the productivity of sewing work.
  • the present invention provides a rotary shuttle device for sewing machines, comprising: a hook body mounted to a drive shaft and provided with a first hook for hooking an upper thread; a bobbin case comprising a bobbin case base received in the hook body and a bobbin case body for holding a bobbin at a location outside the bobbin case base; and the bobbin installed in the bobbin case and having an under thread wound therearound,
  • the bobbin case base comprises: a stud axially provided at a center of a bottom of the bobbin case base, a sidewall comprising a first section, defined between a base surface and a track rim, and a second section, defined at a location behind the first section and partially open to have opposite ends; a flange part formed around a top end of the second section of the sidewall such that the flange part protrudes outwards in a radial direction; a holding slot formed on the flange part at a location near the first end of the second section, thus holding the bobbin case base in a body of a sewing machine; and a needle passing hole formed in the bobbin case base at a location near the holding slot and allowing a needle to pass therethrough when the needle descends,
  • the bobbin case base further comprises an under thread guard, which protrudes from the first end of the sidewall of the bobbin case base and functions to prevent the under thread from being hooked by the hook body.
  • the rotary shuttle device for sewing machines is provided with an under thread guard, which protrudes from one end of the sidewall of a bobbin case base so as to guide an under thread and prevent the under thread from being hooked by a hook body, thus preventing the under thread from being hooked by a first hook of the hook body and preventing both the abrupt cutting of the under thread and the interruption of sewing work, thereby causing the sewing work to progress continuously and satisfactorily and increasing the productivity of sewing work.
  • FIG. 1 is an exploded perspective view illustrating a conventional rotary shuttle device for sewing machines
  • FIG. 2 is a view illustrating a needle in a state in which the needle has been lowered to be hooked by a hook body
  • FIG. 3 is a view illustrating the moment the hook body hooks an upper thread
  • FIG. 4 is a side view of FIG. 3;
  • FIG. 5 through FIG. 10 are views sequentially illustrating sewing work
  • FIG. 11 is a perspective view illustrating the conventional rotary shuttle device in an assembled state
  • FIG. 12 is an exploded perspective view illustrating a rotary shuttle device for sewing machines according to an embodiment of the present invention
  • FIG. 13 is a front view of a bobbin case base shown in FIG. 12;
  • FIG. 14 is a top plan view of the bobbin case base of FIG. 13;
  • FIG. 15 is a perspective view illustrating the rotary shuttle device of FIG. 12 in an assembled state
  • FIG. 16 is a sectional view illustrating a part of the rotary shuttle body of FIG. 15 in detail
  • FIG. 17 is a perspective view illustrating a rotary shuttle device for sewing machines according to another embodiment of the present invention.
  • FIG. 12 is an exploded perspective view illustrating a rotary shuttle device for sewing machines according to an embodiment of the present invention.
  • FIG. 13 is a front view of the bobbin case base shown in FIG. 12.
  • FIG. 14 is a top plan view of the bobbin case base of FIG. 13.
  • FIG. 15 is a perspective view illustrating the rotary shuttle device of FIG. 12 in an assembled state.
  • FIG. 16 is a sectional view illustrating part of the rotary shuttle body of FIG. 15 in detail.
  • the rotary shuttle device 1 for sewing machines with an under thread guard comprises a hook body 20, which is mounted to a drive shaft 10 and is provided with a first hook 22 for hooking an upper thread, a bobbin case BC comprising a bobbin case base 300, which is received in the hook body 20, and a bobbin case body 50 for holding a bobbin 40 at a location outside the bobbin case base.
  • the bobbin 40 is installed in the bobbin case BC and has an under thread wound therearound.
  • a stud 31 is axially provided at the center of the bottom of the bobbin case base 300 such that it is perpendicular to the bottom.
  • the bobbin case base 300 has a sidewall 30a, which comprises a first section 36, defined between a base surface and a track rim 32, and a second section 37, defined at a location behind the first section and partially open to have opposite ends 37a and 37b.
  • a flange part 38 is formed around the top end of the second section 37 of the sidewall such that the flange part 38 protrudes outwards in a radial direction.
  • the flange part 38 is provided with a holding slot 33 at a location near the first end 37a of the second section 37.
  • a needle passing hole 34 is formed in the bobbin case base 300 at a location near the holding slot 33, and allows a needle to pass therethrough when the needle descends.
  • an under thread guard 35 protrudes from the first end 37a of the sidewall 30a of the bobbin case base 300 and functions to prevent an under thread from being hooked by the hook body 20.
  • the under thread guard 35 be formed on an extension line of the flange part 38, which is formed around the top end of the second section 37 of the sidewall 30a, and that a shoulder part 35a be formed on the end of the under thread guard 35 such that the shoulder part 35a protrudes outwards from the first hook 22 of the hook body 20.
  • the under thread guard 35 covers the first hook 22 at a drooping path of the released under thread 4 such that the under thread 4 can be prevented from being hooked by the first hook 22 of the hook body 20.
  • the shoulder part 35a not protrude from the end of the under thread guard 35 at any position, but that the protrusion of the shoulder part 35a be gradually reduced such that the outside end of the shoulder part 35a is located inside the bobbin case BC.
  • the under thread guard 35 has a curved shape, which is formed with a predetermined width from the first end 37a of the sidewall 30a in a radial direction of the sidewall 30a such that the under thread guard 35 does not interfere with the rotation of the hook body 20.
  • the shoulder part 35a of the under thread guard 35 is formed on an extension line with a degree ⁇ of inclination defined by the end 39 of the sidewall 30a of the bobbin case base 300 extending from the holding slot 33 toward the opposite ends 37a and 37b. In other words, the height of the shoulder part 35a is gradually reduced.
  • the under thread guard 35 may be integrally formed with the bobbin case base
  • the under thread guard 35 may be produced separately from the bobbin case base 300 prior to being assembled with the bobbin case base 300, as shown in FIG. 17.
  • the under thread guard 35 for guiding the under thread to the outside of the hook body 20 protrudes from the first end 37a of the sidewall 30a of the bobbin case base 300, thus preventing the under thread from being hooked by the first hook 22 of the hook body 20.
  • the shoulder part 35a of the under thread guard 35 protrudes outwards such that it is located outside the first hook 22 of the hook body 20 in a radial direction, thus covering the first hook 22 such that the first hook 22 can get out of the drooping path of the under thread 4 released from the bobbin case BC.
  • the under thread guard 35 which functions as a plate cover, is located at a position above the first hook 22, which may function as obstruction in the drooping path of the under thread 4 released from the bobbin case BC.
  • the under thread guard 35 allows the under thread 4 to avoid the first hook 22 and prevents interference between the under thread 4 and the first hook 22.
  • the under thread guard 35 of the present invention prevents the under thread 4 from being hooked by the first hook 22 or from being inserted into a gap between the hook body 20 and the bobbin case base 300 regardless of the drooping length of the under thread before sewing work commences, thus preventing both abrupt cutting of the under thread and interruption of sewing work, thereby allowing the sewing work to progress continuously and satisfactorily.
  • the rotary shuttle device for sewing machines is provided with an under thread guard, which protrudes from an end of the sidewall of a bobbin case base so as to guide an under thread and prevent the under thread from being hooked by a hook body, thus preventing the under thread from being hooked by a first hook of the hook body and preventing both abrupt cutting of the under thread and interruption of sewing work, thereby allowing the sewing work to progress continuously and satisfactorily and increasing the productivity of the sewing work.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)

Abstract

Cette invention concerne un dispositif à navette rotative pour machines à coudre équipé d'un pare-fil de dessous. Le dispositif décrit dans cette invention comprend un corps de crochet pourvu d'un premier crochet conçu pour accrocher un fil de dessus, un boîtier de bobine présentant une base de boîtier de bobine et un corps de boîtier de bobine; et une bobine placée dans le boîtier de bobine et présentant un fil de dessous. La base du boîtier de bobine présente une paroi latérale comprenant une première section et une seconde section. Le pare-fil de dessous est en saillie depuis une extrémité de la paroi latérale de la base du boîtier de bobine de manière à guider le fil de dessous et à empêcher ce dernier d'être accroché par le premier crochet, ce qui permet d'éviter à la fois une coupure brutale du fil de dessous et l'interruption du travail de couture. Ce mode de réalisation permet au travail de couture de progresser en continu et de manière satisfaisante, il permet également d'en augmenter la productivité.
PCT/KR2008/000959 2007-02-21 2008-02-19 Dispositif à navette rotative pour machines à coudre pourvu d'un pare-fil de dessous WO2008102968A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020070017389A KR100819907B1 (ko) 2007-02-21 2007-02-21 밑실가드가 구비된 재봉틀의 회전북장치
KR10-2007-0017389 2007-02-21

Publications (1)

Publication Number Publication Date
WO2008102968A1 true WO2008102968A1 (fr) 2008-08-28

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Application Number Title Priority Date Filing Date
PCT/KR2008/000959 WO2008102968A1 (fr) 2007-02-21 2008-02-19 Dispositif à navette rotative pour machines à coudre pourvu d'un pare-fil de dessous

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KR (1) KR100819907B1 (fr)
CN (1) CN101668888A (fr)
WO (1) WO2008102968A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110079942A (zh) * 2019-05-24 2019-08-02 安徽杰羽制鞋机械科技有限公司 一种缝纫机底线监测装置及其监测方法

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CN102454070A (zh) * 2010-10-29 2012-05-16 苏州丽丝兰时装有限公司 缝纫机安全装置
KR101517891B1 (ko) 2013-07-29 2015-05-06 정병준 셔틀케이스 고정장치
KR101828483B1 (ko) 2017-06-14 2018-02-12 허필호 재봉틀의 밑실 공급장치
CN110863306B (zh) * 2018-08-27 2021-08-03 重庆大学 一种功能电子织物的织造方法
CN109183296A (zh) * 2018-10-22 2019-01-11 向康城 一种分线器及具有该分线器的刺绣机
KR102189146B1 (ko) 2019-06-19 2020-12-09 허문영 재봉틀의 밑실 공급장치
CN115262111A (zh) * 2022-04-14 2022-11-01 诸暨市韩一进出口有限公司 防止上线夹住的缝纫机和刺绣机的旋梭装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02224695A (ja) * 1989-02-27 1990-09-06 Hirose Mfg Co Ltd 半回転かま
JPH08155176A (ja) * 1994-12-07 1996-06-18 Juki Corp 本縫ミシンの全回転釜
WO2001002638A1 (fr) * 1999-07-01 2001-01-11 Philipp Moll Navette rotative pour machines a coudre ou a tricoter
KR20050092279A (ko) * 2004-03-15 2005-09-21 코베스트 주식회사 밑실량을 늘린 재봉틀의 회전북장치

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6040205Y2 (ja) 1980-11-10 1985-12-03 ブラザー工業株式会社 ミシンの全回転釜

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02224695A (ja) * 1989-02-27 1990-09-06 Hirose Mfg Co Ltd 半回転かま
JPH08155176A (ja) * 1994-12-07 1996-06-18 Juki Corp 本縫ミシンの全回転釜
WO2001002638A1 (fr) * 1999-07-01 2001-01-11 Philipp Moll Navette rotative pour machines a coudre ou a tricoter
KR20050092279A (ko) * 2004-03-15 2005-09-21 코베스트 주식회사 밑실량을 늘린 재봉틀의 회전북장치

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110079942A (zh) * 2019-05-24 2019-08-02 安徽杰羽制鞋机械科技有限公司 一种缝纫机底线监测装置及其监测方法

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Publication number Publication date
CN101668888A (zh) 2010-03-10
KR100819907B1 (ko) 2008-04-08

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