EP4089221A1 - Positionneur de fil de point de chaînette double et machine à coudre comportant un positionneur de fil - Google Patents

Positionneur de fil de point de chaînette double et machine à coudre comportant un positionneur de fil Download PDF

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Publication number
EP4089221A1
EP4089221A1 EP22165589.7A EP22165589A EP4089221A1 EP 4089221 A1 EP4089221 A1 EP 4089221A1 EP 22165589 A EP22165589 A EP 22165589A EP 4089221 A1 EP4089221 A1 EP 4089221A1
Authority
EP
European Patent Office
Prior art keywords
thread
needle
positioner
sewing machine
positioning portion
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.)
Withdrawn
Application number
EP22165589.7A
Other languages
German (de)
English (en)
Inventor
Shota Komatsu
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.)
Janome Corp
Original Assignee
Janome Corp
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 Janome Corp filed Critical Janome Corp
Publication of EP4089221A1 publication Critical patent/EP4089221A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • D05B—SEWING
    • D05B1/00—General types of sewing apparatus or machines without mechanism for lateral movement of the needle or the work or both
    • D05B1/08—General types of sewing apparatus or machines without mechanism for lateral movement of the needle or the work or both for making multi-thread seams
    • D05B1/10—Double chain-stitch seams

Definitions

  • the present invention relates to a thread positioner of a double chain stitch sewing machine to hold a thread during empty sewing (when forming a hollow ring) for surely forming the hollow ring and a sewing machine having the thread positioner.
  • Patent Document 1 Japanese Unexamined Patent Application Publication No. 2000-93671
  • the role of the thread positioner of Patent Document 1 is to lock and hold the needle threads, which receive the force in the lateral direction caused by the reciprocating motion of a looper near a needle, on the thread positioner at the predetermined position in the left and right directions.
  • the vicinity of the needle is also functions as a so-called thread passage through which the thread other than the needle threads (i.e., looper thread) passes.
  • the thread positioner may obstruct the movement of the looper thread when the thread cast-off occurs.
  • the technical problem is that the thread positioner should satisfy conflicting two demands: the movement of the needle threads in the left and right directions should be restricted; and the movement of the looper thread in the left and right directions (strictly, the movement from right to left) should not be restricted.
  • the present invention aims for providing the thread positioner and the sewing machine having the thread positioner of the double chain stitch sewing machine capable of restricting the movement of the needle threads in the left and right directions and not restricting the movement of the looper thread in the left and right directions when forming the hollow rings.
  • the present invention employs the configuration of a thread positioner provided on a needle plate of a double chain stitch sewing machine for forming a seam by a plurality of needle threads and a looper thread characterized in that the thread positioner includes a needle thread holding plate provided below the needle plate, the needle thread holding plate extending horizontally from a front to a rear, a rear end portion of the needle thread holding plate includes: a guide portion for guiding the plurality of needle threads; and a thread positioning portion for regulating a movement of the plurality of needle threads in a right-and-left direction, and the thread positioning portion includes: a protrusion linearly protruded rearward from the guide portion; flat portions formed on left and right side surfaces of the protrusion; and an inclined portion formed on a tip of the protrusion, the inclined portion being inclined from a right to a rear left.
  • An embodiment of the thread positioner of the double chain stitch sewing machine employs the configuration characterized in that the thread positioning portion is protruded from the needle thread holding plate while an upper surface of the protrusion is inclined upward from the tip.
  • Another embodiment employs the configuration characterized in that the thread positioning portion is protruded from the needle thread holding plate while an upper surface of the protrusion is inclined upward from the tip.
  • Another embodiment employs the configuration characterized in that the thread positioning portion includes: a fixed thread positioning portion fixed to the needle thread holding plate; and a slide thread positioning portion which is retractable in a front-rear direction from a lower portion of the fixed thread positioning portion in accordance with an operation of the double chain stitch sewing machine.
  • the double chain stitch sewing machine of the present invention employs the configuration characterized to include the above described thread positioner.
  • the movement of the needle threads in the right-and-left direction can be surely restricted by the protrusion while the movement of the looper thread from right to left is not restricted by the inclined portion when the thread cast-off occurs.
  • the vertical direction may be referred to as "up down,” the direction from the upper right to the lower left may be referred to as “front-rear,” and the direction from the upper left to the lower right may be referred to as “left-right” in the perspective view shown in Fig. 1 .
  • the front-rear direction may be referred to as "X-direction” and the left-right direction may be referred to as "Y-direction.”
  • Fig. 1 is an upper shaft which is rotatably supported on an upper part of a sewing machine N
  • 2 is a lower shaft which is rotatably supported on a lower part of the sewing machine N.
  • the upper shaft 1 and the lower shaft 2 are connected with each other by an upper shaft-lower shaft interlocking mechanism 3.
  • the upper shaft 1 and the lower shaft 2 are synchronously rotated by a rotational force of a not-illustrated sewing machine motor.
  • the needle driving device 10 is a needle driving device for driving three needles 11 the upper shaft 1 vertically (up and down) by a rotational movement of the needle driving device, 20 is a pressing device having a presser foot 21 and 30 is a needle plate.
  • the needle driving device 10 forms a seam on a sewing object (not illustrated) sandwiched between the pressing device 20 and the needle plate 30.
  • a needle driving device 10 As shown in Fig. 2 , in the needle driving device 10, three needles 11 (11L, 11M, 11R) are attached to a needle bar 13 by a needle fixing portion 12.
  • the presser foot 21 is attached to a presser bar 23 by a presser holder 22.
  • the needle plate 30 includes: three needle location holes 31 which are arranged at equal intervals along the direction orthogonal to a cloth feeding direction F so that the three needles 11 pass through the three needle location holes 31 from the above; three grooves 32 formed along the cloth feeding direction F from the three needle location holes 31; a left claw 33 and a right claw 34 formed between the grooves 32 and extended in the cloth feeding direction F; and a feed dog slit 35 formed along the cloth feeding direction F so that a feed dog 60 appears from the feed dog slit 35.
  • An auxiliary needle plate 40 is fixed to a lower surface of the needle plate 30 by a screw 37.
  • a thread positioner 41 is provided on the auxiliary needle plate 40 in the vicinity (frontward in the cloth feeding direction F) of the position to which the needles 11 are lowered.
  • a looper 50 forms a double chain stitch by a looper thread 55 together with the later described three needle threads 15 inserted through the three needles 11.
  • the thread positioner 41 includes: a needle thread holding plate 42 provided in the frontward of the needles 11 and extended horizontally from the front to the rear; guide portions 43 (left guide portions 43L, center guide portion 43M, right guide portions 43R) formed on three positions of the rear end portion of the needle thread holding plate 42 for guiding three needle threads (not illustrated); and two thread positioning portions 44 (left thread positioning portion 44L, right thread positioning portion 44R) provided between the guide portions 43 for restricting the movement of the needle threads 15 in the right-and-left direction (lateral direction).
  • the thread positioning portions 44 includes: a protrusion 45 which is linearly protruded rearward from a guide portions 43 of the needle thread holding plate 42 with a projected dimension (length) D; flat portions 46 formed on left and right side surfaces of the protrusion 45; and an inclined portion 47 formed on a tip of the protrusion 45 so as to be inclined from a right to a rear left.
  • the protrusion 45 has a streamline shape streamlined toward the cloth feeding direction F.
  • a lower surface 45a of the protrusion 45 is gradually (gently) inclined from the tip to the lower side so that the looper thread 55 can be smoothly escaped.
  • the flat portions 46 formed on the protrusion 45 is inclined from the tip of the protrusion 45 upward, protruded from the upper surface of the needle thread holding plate 42 with a height H, and ended at a predetermined dimension (length).
  • the needle threads 15 and the looper thread 55 are inserted into the needles 11 and the looper 50 respectively, the rotational movement of the upper shaft 1 is converted into the vertical movement of the needles 11, and the rotational movement of the lower shaft 2 is converted into the movement of the looper 50 and the feed dog 60.
  • the needles 11, the looper 50 and the feed dog 60 are mutually interlocked to entangle the needle threads 15 and the looper thread 55 with each other and form a seam of the double chain stitch.
  • the sewing object cloth
  • the needle plate 30 the seam is formed on the cloth.
  • the cloth is not provided, only the seam (hollow ring) is formed.
  • the dot in the arrow mark indicating the trajectory of the vertical movement of the needles 11 and in the arrow mark indicating the trajectory of the movement of the looper 50 shows the position (timing) of each configuration in the trajectory.
  • the needles 11 are positioned at the lowermost point and the looper 50 is positioned at the rightmost point.
  • the force of the left movement of the looper 50 is partly transmitted to the needle threads 15 and the needle threads 15 receives the force of moving to the left as a whole.
  • the needle threads 15 are locked by the thread positioner 41 (particularly by the protrusion 45), the movement to the left is restricted.
  • the looper 50 captures all of the loops ⁇ and the needles 11 re further raised. Furthermore, the needle threads 15 are tightened by the operation of a not-illustrated needle thread take-up lever.
  • the whole seam is transferred frontward by the feed dog 60 by a predetermined amount.
  • the looper thread 55 entered under the lower right of the right thread positioning portion 44R passes over the right thread positioning portion 44R and moves to the upper left of the right thread positioning portion 44R in the fourth state (cast-off of looper thread 55).
  • the looper thread 55 passes over the right thread positioning portion 44R along the inclined portion 47, the cast-off can be surely done.
  • the force of the right movement of the looper 50 is partly transmitted to the needle threads 15 and the needle threads 15 receives the force of moving to the right as a whole.
  • the needle threads 15 are locked by the thread positioner 41 (particularly by the protrusion 45), the movement to the right is restricted.
  • the needles 11 can surely capture the looper thread 55.
  • the looper 50 further moves to the right and moved to the front.
  • the looper 50 is gradually released from the engagement of the needle threads 15.
  • the needles 11 are lowered while scooping the looper thread 55, a new seam is formed.
  • the hollow ring is continuously formed by the double chain stitch by repeating the cycle from the first state to the sixth state.
  • the movement of the needle threads 15 in the right-and-left direction is restricted by the protrusion 45 of the thread positioner 41.
  • the looper thread 55 is allowed to move from the lower right to the upper left when the thread cast-off occurs in the looper thread 55 by the operation of the inclined portion 47 of the thread positioner 41.
  • the hollow ring can be surely formed even when the cloth does not exist.
  • the looper thread 55 passes over only the right thread positioning portion 44R when the thread cast-off occurs as a basic behavior.
  • the looper thread 55 can also pass over the left thread positioning portion 44L when the thread cast-off occurs depending on the difference of the flexibility caused by the material of the thread and the difference of the sewing conditions such as a sewing speed.
  • 70 is an auxiliary needle plate.
  • a thread positioner 71 is provided on the auxiliary needle plate 70 in the vicinity (front) of the cloth feeding direction F with respect to the position to which the needles 11 are lowered.
  • the thread positioner 71 includes: a needle thread holding plate 72 provided in the frontward of the needles 11 and extended horizontally from the front to the rear; guide portions 73 formed on three positions of the rear end portion of the needle thread holding plate 72 for guiding three needle threads (not illustrated); and two thread positioning portions 74 (right thread positioning portion 74R, left thread positioning portion 74L) provided between the guide portions 73 for restricting the movement of the needle threads 15 in the right-and-left direction (lateral direction).
  • the thread positioning portions 74 includes: a fixed thread positioning portion 75 fixed to the needle thread holding plate 72; and a slide thread positioning portion 80 which is retractable in a front-rear direction from a lower portion of the needle thread holding plate 72 in accordance with an operation of the sewing machine N.
  • a slide groove 76 and a slide hole 77 are formed on a lower surface of the needle thread holding plate 72 for guiding a slide plate 82 provided with the slide thread positioning portion 80 at the tip of the slide plate 82.
  • the slide plate 82 is energized toward a driving cam 83 fixed to the lower shaft 2 by a compression spring 78 provided between a guide portion 79 and the slide plate 82.
  • the slide plate 82 is slid in the front-rear direction in synchronization with the rotation of the lower shaft 2 by the operation of the driving cam 83 fixed to the lower shaft 2.
  • the projected dimension D of a slide protrusion 81 of the slide thread positioning portion 80 is periodically changed from Dmin to Dmax in synchronization with the rotation of the lower shaft 2.
  • the rotation of the lower shaft 2 i.e., process of sewing
  • the slide thread positioning portion 80 is slid in the front-rear direction with respect to the needle thread holding plate 72 by the operation of the driving cam 83.
  • the projected dimension D is changed.
  • the timing of the driving cam 83 is specified so that the projected dimension D becomes the minimum value Dmin.
  • the timing of the driving cam 83 is specified so that the projected dimension D is increased within the range between Dmid and Dmax.
  • the movement of the looper thread 15 in the left and right directions is more surely restricted by the slide protrusion 81 where the projected dimension D is increased.
  • the looper thread 55 is allowed to move from the right to the left more surely when the thread cast-off occurs in the looper thread 55 by the operation of the inclined portion 74a of the thread positioning portions 74 where the projected dimension D becomes the minimum value Dmin.
  • the hollow ring can be more surely formed even when the cloth does not exist.
  • the slide protrusion 81 is slid when the sewing object does not exist, while the sliding of the slide protrusion 81 is stopped when the sewing object exists.
  • the thread positioner 71 can be surely enabled only when forming the hollow ring.
  • the thread positioning portion can surely restrict the movement of the needle threads in the right-and-left direction by a protrusion without restricting the movement of the looper thread from right to left by an inclined portion when a thread cast-off occurs.
  • the present invention is advantageous for the thread positioner applied to the double chain stitch sewing machine.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
EP22165589.7A 2021-05-11 2022-03-30 Positionneur de fil de point de chaînette double et machine à coudre comportant un positionneur de fil Withdrawn EP4089221A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2021080529A JP2022174611A (ja) 2021-05-11 2021-05-11 二重環縫いミシンの整糸器および該整糸器を備えるミシン

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EP4089221A1 true EP4089221A1 (fr) 2022-11-16

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EP22165589.7A Withdrawn EP4089221A1 (fr) 2021-05-11 2022-03-30 Positionneur de fil de point de chaînette double et machine à coudre comportant un positionneur de fil

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Country Link
US (1) US20220364286A1 (fr)
EP (1) EP4089221A1 (fr)
JP (1) JP2022174611A (fr)
AU (1) AU2022202438A1 (fr)
TW (1) TW202244347A (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000093671A (ja) 1998-09-22 2000-04-04 Suzuki Seisakusho:Kk 偏平縫いミシンの空環形成装置
US20020195036A1 (en) * 2001-05-23 2002-12-26 Juki Corporation Loop forming device used for a chainstitch sewing machine
JP2003260286A (ja) * 2002-03-08 2003-09-16 Suzuki Seisakusho:Kk 偏平縫いミシンの針板構造

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5503094A (en) * 1995-02-27 1996-04-02 Tseng; Hsien-Chang Needle plate with movable tongues for sewing machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000093671A (ja) 1998-09-22 2000-04-04 Suzuki Seisakusho:Kk 偏平縫いミシンの空環形成装置
US20020195036A1 (en) * 2001-05-23 2002-12-26 Juki Corporation Loop forming device used for a chainstitch sewing machine
JP2003260286A (ja) * 2002-03-08 2003-09-16 Suzuki Seisakusho:Kk 偏平縫いミシンの針板構造

Also Published As

Publication number Publication date
TW202244347A (zh) 2022-11-16
US20220364286A1 (en) 2022-11-17
JP2022174611A (ja) 2022-11-24
AU2022202438A1 (en) 2022-12-01

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