EP2455524A1 - Fadenwickelvorrichtung einer Nähmaschine - Google Patents

Fadenwickelvorrichtung einer Nähmaschine Download PDF

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Publication number
EP2455524A1
EP2455524A1 EP11189435A EP11189435A EP2455524A1 EP 2455524 A1 EP2455524 A1 EP 2455524A1 EP 11189435 A EP11189435 A EP 11189435A EP 11189435 A EP11189435 A EP 11189435A EP 2455524 A1 EP2455524 A1 EP 2455524A1
Authority
EP
European Patent Office
Prior art keywords
thread
bobbin
thread winding
resistance applying
winding device
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Withdrawn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
EP11189435A
Other languages
English (en)
French (fr)
Inventor
Hirokazu Onitsuka
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.)
Juki Corp
Original Assignee
Juki 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 Juki Corp filed Critical Juki Corp
Publication of EP2455524A1 publication Critical patent/EP2455524A1/de
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B59/00—Applications of bobbin-winding or -changing devices; Indicating or control devices associated therewith
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B59/00—Applications of bobbin-winding or -changing devices; Indicating or control devices associated therewith
    • D05B59/02—Devices for determining or indicating the length of thread still on the bobbin

Definitions

  • the present invention relates to a thread winding device of a sewing machine.
  • the thread winding device includes a clamp portion for holding a thread and serves to interpose one of ends of the thread in the clamp portion, and to set the bobbin onto a thread winding shaft and to rotate them, thereby winding the thread.
  • the holding force of the clamp portion is increased so that the thread in the winding start part can be prevented from being pulled out of the clamp portion.
  • a first aspect of the embodiment is directed to a thread winding device of a sewing machine, the thread winding device including a base portion (1) disposed fixedly to a surface of a machine frame of a sewing machine; a driving shaft (6) which is rotatable interlockingly with a driving source; a rotating member (2) supported rotatably on the base portion interlockingly with the driving shaft and having a shaft portion for removably holding a bobbin; a clamp member (7) which is supported on the rotating member and interposes a tip of a thread to be supplied from a predetermined thread supply source and wound upon the bobbin between the clamp member and the rotating member; a resistance applying member (5) which is engageable to temporarily apply a resistance to the thread supplied from the thread supply source toward the clamp member; and an operating member (3) configured to move the resistance applying member to a position in which the thread is engaged with the resistance applying member and a position in which the thread is not engaged with the resistance applying member.
  • a second aspect of the embodiment is directed to the thread winding device which has the same structure as that of the first aspect of the embodiment, and is characterized in that the resistance applying member has a guiding portion (5a) for guiding the thread supplied from the thread supply source toward the clamp member so as to be bent, and an interposing portion (5b) for interposing the thread that is passed through the guiding portion between an engaging surface provided in the base portion and the interposing portion.
  • the resistance applying member has a guiding portion (5a) for guiding the thread supplied from the thread supply source toward the clamp member so as to be bent, and an interposing portion (5b) for interposing the thread that is passed through the guiding portion between an engaging surface provided in the base portion and the interposing portion.
  • a third aspect of the embodiment is directed to the thread winding device which has the same structure as that of the first or second aspect of the embodiment, and further includes a thread winding amount detecting member (4) supported to enable approach and separation with respect to a thread winding portion of the bobbin, and configured to abut on the thread wound upon the bobbin held in the shaft portion and to detect that a thread winding amount becomes proper according to a thickness of the wound thread, wherein the resistance applying member is supported to be rotated integrally with the thread winding amount detecting member and, when winding the thread on the bobbin starts, rotates and shifts to an arrangement in which the thread hung on the resistance applying member is removed in association with rotation of the thread winding amount detecting member toward a shaft portion side.
  • a fourth aspect of the embodiment is directed to the thread winding device which has the same structure as that of the third aspect of the embodiment, and is characterized in that an abutting surface (1b) is formed in the base portion, the abutting surface for stopping the resistance applying member at a predetermined rotation angle when the thread winding amount detecting member detects that the amount of the thread wound upon the bobbin becomes proper.
  • a fifth aspect of the embodiment is directed to the thread winding device of a sewing machine which has the same structure as that of the third or fourth aspect of the embodiment, and further includes a stopper mechanism (8,9) which stops the rotating member at a predetermined rotation angle when the thread winding amount detecting member detects that the amount of the thread wound upon the bobbin becomes proper.
  • a sixth aspect of the embodiment is directed to the thread winding device which has the same structure as that of the first aspect of the embodiment, and is characterized in that the rotating member, the clamp member and the resistance applying member are configured to be supported on the base portion.
  • a seventh aspect of the embodiment is directed to the thread winding device which has the same structure as that of the third aspect of the embodiment, and is characterized in that the resistance applying member is provided in a lever member configured to be operated to approximate the thread winding amount detecting member to the thread winding portion of the bobbin.
  • An eighth aspect of the embodiment is directed to a thread winding device of a sewing machine, the thread winding device including:
  • the resistance applying member temporarily applies a resistance to the thread before the thread is engaged with the rotating member in the thread winding device of a sewing machine.
  • the thread supply source side toward the rotating member therefore, it is possible to prevent the thread from being excessively sent out. Consequently, it is possible to appropriately apply a force to the thread, thereby interposing the thread between the rotating member and the clamp member easily.
  • the resistance applying member applies a resistance to the thread to be engaged with the rotating member, thereby enabling a regulation so as to prevent the thread from being excessively sent out and interposing the thread between the rotating member and the clamp member reliably with one hand.
  • the resistance applying member is rotated integrally with the thread winding amount detecting member so that the thread hung on the resistance applying member is removed if the thread winding amount detecting member is rotated toward the shaft portion side in order to cause the thread winding amount detecting member to abut on the peripheral surface of the thread to be wound upon the bobbin. Consequently, it is possible to quickly wind the thread.
  • the resistance applying member can be stopped at the predetermined rotation angle with a simple structure.
  • the stopper mechanism stops the rotating member at the predetermined rotation angle. Consequently, it is possible to always stop the rotating member in the same posture.
  • the portion of the rotating member which engages the thread always has the same arrangement.
  • a next thread winding operation is to be carried out, therefore, it is possible to engage the thread with the rotating member without regulating the angle of the rotating member.
  • a sewing machine 100 includes a needle driving mechanism, a cloth feeding mechanism and a shuttle mechanism which are driven by rotation of a main shaft (not shown) to which a driving force is transmitted from a sewing machine motor serving as a driving source, which is not shown.
  • the needle driving mechanism vertically drives a needle 101 through which a needle thread is inserted.
  • the thread feeding mechanism delivers a workpiece such as a cloth which is mounted on a throat plate 102 and is pressed by a cloth presser 103 synchronously with the needle driving mechanism.
  • the shuttle mechanism has a rotating shuttle and a bobbin which is accommodated in the shuttle and upon which a bobbin thread is wound, and entangles the needle thread with the bobbin thread in cooperation with the needle 101 below the throat plate 102 through the rotation of the shuttle. Since the mechanisms of the sewing machine are the same as the conventional well-known mechanisms, they will not be described in detail in the embodiment.
  • the sewing machine 100 is provided with a thread winding device 10 for previously winding the bobbin thread upon the bobbin.
  • the bobbin is an ordinary commercial product having a structure in which a thread is wound upon a shaft-shaped thread winding portion.
  • the thread winding device 10 of the sewing machine is provided on a side surface of a machine frame in an arm portion of the sewing machine 100 and a thread tensioner 20 for applying a tension to a needle thread is provided in the vicinity of the thread winding device 10.
  • the thread winding device 10 includes a base member 1 serving as a backing member which is fixed to the surface of the machine frame of the sewing machine 100, a rotating member 2 supported rotatably with respect to the base member 1, a lever member 3 serving as an operating member which is supported rotatably with respect to the base member 1, and a thread winding amount detecting member 4 and a resistance applying member 5 which are fixed to the lever member 3 and are rotated integrally with the lever member 3.
  • the base member 1 may be directly formed integrally with the surface of the machine frame of the sewing machine 100, and the base member 1 and the case of the formation on the surface of the machine frame will be generally referred to as a base portion.
  • the base member 1 has an engaging surface 1a and an abutting surface 1b on a surface.
  • the engaging surface 1a is formed on an end face (a surface) in an axial direction along a rotating direction of the resistance applying member 5 which will be described below and the abutting surface 1b is linked to the engaging surface 1a and is orthogonal to the rotating direction of the resistance applying member 5.
  • the rotating member 2 is coupled to a tip of a driving shaft 6 which is connected to a main shaft to be rotated and driven by a sewing machine motor and is rotatable, which is not shown. As shown in Fig. 2 , a surface of the rotating member 2 is almost disk-shaped and a shaft portion 6a holding a bobbin B removably is protruded concentrically with the driving shaft 6. The rotating member 2 is rotated by a rotation of the driving shaft 6 in thread winding.
  • a clamp member 7 to be an elastic plate material fixed to an end face at a tip side in an axial direction of the rotating member 2 is disposed to be extended in a radial direction to pass through an axis of the shaft portion 6a, and a tip of the clamp member 7 is provided with a thread guarding portion 7a which is opposed to the engaging surface 1a.
  • a thread engaging portion 2a is formed on the end face (surface) at the tip side in the axial direction of the rotating member 2.
  • the thread engaging portion 2a is formed to be lower with a slight step over a rotating path of the thread guarding portion 7a.
  • a tip of a thread to be supplied from a predetermined thread supply source (for example, the thread tensioner 20 side) and wound upon the bobbin B held in the shaft portion 6a is interposed between the rotating member 2 and the clamp member 7, and the thread is engaged with the rotating member 2 by an elastic force of the clamp member 7.
  • a predetermined thread supply source for example, the thread tensioner 20 side
  • great tightening between the rotating member 2 and the clamp member 7 is designed to increase the elastic force of the clamp member 7 in order to enhance a holding force for interposing the thread between the rotating member 2 and the clamp member 7.
  • a support shaft 3A which is parallel with the driving shaft 6 is supported rotatably with respect to the base member 1.
  • the lever member 3 is fixed to a tip part of the support shaft 3A and is rotated around an axis of the support shaft 3A.
  • the lever member 3 is coupled to an energizing mechanism (not shown) through the support shaft 3A, for example.
  • the lever member 3 is rotated by an energizing force of a spring through the energizing mechanism.
  • the lever member 3 is energized to be rotated clockwise when it is positioned in a clockwise direction from a predetermined fulcrum, and the lever member 3 is energized to be rotated counterclockwise when it is positioned in a counterclockwise direction from the predetermined fulcrum.
  • the fulcrum of the lever member 3 corresponds to a rotating position of the lever member 3 positioned when the thread wound upon the bobbin B on the shaft portion 6a reaches a predetermined thread winding amount.
  • the thread winding amount detecting member 4 is fixed to the lever member 3 and has a thread presser 4a opposed to a thread winding portion of the bobbin B held on the shaft portion 6a at a tip thereof.
  • the thread winding amount detecting member 4 is rotated to cause the thread presser 4a to approach the shaft portion 6a when the lever member 3 is rotated in the clockwise direction of Fig. 2 .
  • the slender resistance applying member 5 is fixed to a back side of the lever member 3 and is rotated integrally with the lever member 3. As shown in Fig. 2 , the resistance applying member 5 has a guiding portion 5a protruded from a surface of an intermediate part in a longitudinal direction and an interposing portion 5b formed in a tip part in the longitudinal direction.
  • the guiding portion 5a is disposed in a protrusion in a path for the needle thread supplied from a thread supply source (for example, the thread tensioner 20 side) toward the thread engaging portion 2a of the rotating member 2, and serves to guide the needle thread to be bent.
  • a thread supply source for example, the thread tensioner 20 side
  • the guiding portion 5a has a smooth surface taking a hemispherical shape as shown in Fig. 3 , and the thread tends to slip in the spherical part.
  • a thread groove 5c for guarding a thread is formed in a notch in a radial direction within a predetermined circumferential range in a part of the guiding portion 5a, and the thread can be hung on the thread groove 5c portion.
  • the interposing portion 5b interposes the needle thread passing through the guiding portion 5a between the interposing portion 5b and the engaging surface 1a of the base member 1.
  • the abutting surface 1b of the base member 1 abuts on the resistance applying member 5 to engage the thread winding amount detecting member 4 with the resistance applying member 5 at a predetermined rotation angle.
  • the engaging surface 1a is disposed opposite to the interposing portion 5b of the resistance applying member 5 engaged at the predetermined rotation angle, and can interpose a thread T passing through the guiding portion 5a.
  • the resistance applying member 5 temporarily applies a resistance to the thread hung on the resistance applying member 5 before the thread to be wound upon the bobbin B is engaged with the rotating member 2.
  • a cam member 8 having an engaging groove 8a formed thereon is fixed to the driving shaft 6, and a pawl member 9 having an engaging pawl 9a formed thereon is fixed to the support shaft 3A.
  • a one-way clutch device (not shown) is disposed between the driving shaft 6 and the main shaft of the sewing machine to stop the rotation of the driving shaft 6a through an engagement of the engaging pawl 9a of the pawl member 9 with the engaging groove 8a of the cam member 8.
  • the driving operation of the main shaft of the sewing machine (not shown) is not stopped but a transmission of a driving force from the main shaft to the driving shaft 6 is interrupted to stop the rotation of the rotating member 2 together with the driving shaft 6.
  • the cam member 8 provided on the driving shaft 6 and the pawl member 9 provided on the support shaft 3A function as a stopper mechanism for stopping the rotating member 2.
  • the stopper mechanism can stop the rotating member 2 at a predetermined rotation angle at which the thread engaging portion 2a of the rotating member 2 is placed above.
  • the thread tensioner 20 includes a pair of thread tension discs, a spring for pressing the mutual thread tension discs, and an adjusting screw for adjusting a pressing force of the spring, for example.
  • the thread tensioner 20 serves to apply a load to the thread passing through a portion between the thread tension discs, thereby regulating a tension to be applied to the thread.
  • the driving shaft 6 and the support shaft 3A are extended in the machine frame of the sewing machine 100.
  • the thread winding device 10 in Fig. 2 is set into a state in which the lever member 3 is fully turned counterclockwise.
  • the pawl member 9 is engaged with the cam member 8 and is stopped in a predetermined position (at a rotation angle) in which the thread engaging portion 2a of the rotating member 2 is placed above.
  • the interposing portion 5b of the resistance applying member 5 comes in contact with the abutting surface 1b of the base member 1.
  • the thread groove 5c of the resistance applying member 5 is positioned on a left and lower side in Fig. 2 and is placed in a position in which the thread T between the thread tensioner 20 and the interposing portion 1a can be engaged.
  • An operator inserts the thread T supplied from a predetermined thread supply source through the thread tensioner 20 and pulls the thread T from the thread tensioner 20 toward the thread winding device 10.
  • the operator pulls the thread T toward the interposing portion 5b side placed above the guiding portion 5a and interposes the thread T between the interposing portion 5b of the resistance applying member 5 and the base member 1.
  • the guiding portion 5a of the resistance applying member 5 is positioned on a lower side of the thread engaging portion 2a of the rotating member 2. Therefore, the thread T supplied from the thread tensioner 20 toward the thread engaging portion 2a is bent by the guiding portion 5a. Moreover, the thread T supplied from the guiding portion 5a to the interposing portion 5b goes around from a surface having the guiding portion 5a in the resistance applying member 5 to a back face at an opposite side and is thus pressed between the interposing portion 5b and the base member 1. Consequently, the thread T is laid over the resistance applying member 5 in an almost N shape.
  • the operator pulls the thread T laid over the guiding portion 5a and the interposing portion 5b in the resistance applying member 5 toward the thread engaging portion 2a of the rotating member 2 and interposes one of ends of the thread T between the thread engaging portion 2a and the thread guarding portion 7a.
  • the thread T is bent to take an almost N shape and is laid over the resistance applying member 5. Therefore, a resistance such as a friction is applied from the resistance applying member 5 to the pulled thread T so that the thread T is supplied from the thread tensioner 20 side with difficulty.
  • the operator engages one of the ends of the thread T between the thread engaging portion 2a of the rotating member 2 and the thread guarding portion 7a of the clamp member 7, and thereafter attaches the bobbin B to the shaft portion 6a of the rotating member 2.
  • the operator rotates the lever member 3 clockwise to disengage the pawl member 9 from the cam member 8 in order to start to wind the thread T upon the bobbin B. If the operator rotates the lever member 3 in the clockwise direction from a predetermined fulcrum, the lever member 3 is rotated by means of an energizing mechanism (not shown) so that the thread winding amount detecting member 4 and the resistance applying member 5 are rotated integrally with the lever member 3 until the thread presser 4a of the thread winding amount detecting member 4 abuts on a central axis of the bobbin B.
  • the lever member 3 is rotated clockwise so that the resistance applying member 5 is rotated clockwise. Consequently, the arrangement of the guiding portion 5a of the resistance applying member 5 is switched so that the position of the thread groove 5c is gradually turned upward. As shown in Fig. 4A , the arrangement is switched in such a manner that the thread groove 5c is positioned above. Consequently, the thread T slips out of the thread groove 5c and comes in contact with the spherical guiding portion 5a. The thread T coming in contact with the guiding portion 5a is removed from the guiding portion 5a to slide over the spherical part of the guiding portion 5a.
  • the driving shaft 6 is rotated and driven so that the rotating member 2 and the shaft portion 6a are rotated to wind the thread T upon the bobbin B rotated together with the rotating member 2 and the shaft portion 6a.
  • the thread presser 4a of the thread winding amount detecting member 4 continuously abuts on the thread T wound upon the bobbin B. With an increase in the thickness of the wound thread, the thread presser 4a is pushed back to be separated from the central axis of the bobbin B.
  • the thread presser 4a With a gradual increase in the thread winding amount of the bobbin B, the thread presser 4a is separated from the shaft portion 6 of the rotating member 2 so that the thread winding amount detecting member 4 is rotated counterclockwise and the lever member 3 is also rotated counterclockwise together with the thread winding amount detecting member 4.
  • the thread presser 4a of the thread winding amount detecting member 4 abutting on the peripheral surface of the thread T wound upon the bobbin B detects that the thread winding amount in the bobbin B becomes proper so that the energizing direction of the lever member 3 through the energizing mechanism (not shown) is switched from the clockwise direction into the counterclockwise direction and the pawl member 9 and the cam member 8 are thus engaged with each other.
  • the thread winding device 10 is brought into a stopping state at a predetermined rotation angle at which the thread engaging portion 2a of the rotating member 2 is positioned above.
  • the thread winding device 10 of the sewing machine hangs the thread T on the resistance applying member 5 before engaging one of the ends of the thread T in a winding start part with the rotating member 2. Consequently, it is possible to apply a resistance to the thread T pulled toward the thread engaging portion 2a of the rotating member 2.
  • the lever member 3 When the operation for winding the thread T upon the bobbin B is to be started in the thread winding device 10, moreover, the lever member 3 is rotated clockwise in order to cause the thread presser 4a of the thread winding amount detecting member 4 to abut on the peripheral surface of the thread T to be wound upon the central shaft of the bobbin B. By rotating the resistance applying member 5 together with the lever member 3, consequently, it is possible to remove the thread T hung on the resistance applying member 5.
  • the thread winding device 10 can wind the thread T in a proper amount upon the bobbin B.
  • the clamp member 7 of the thread winding device 10 can be stronger than that in the related-art clamp member. Therefore, it is possible to wind the thread T by applying a higher tension than that in the related art.
  • By tightly winding the thread T upon the bobbin B it is possible to increase the amount of the thread wound upon the bobbin B.
  • the thread tensioner 20 may be omitted.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
EP11189435A 2010-11-18 2011-11-16 Fadenwickelvorrichtung einer Nähmaschine Withdrawn EP2455524A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2010257385A JP2012105837A (ja) 2010-11-18 2010-11-18 ミシンの糸巻き装置

Publications (1)

Publication Number Publication Date
EP2455524A1 true EP2455524A1 (de) 2012-05-23

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ID=45418351

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11189435A Withdrawn EP2455524A1 (de) 2010-11-18 2011-11-16 Fadenwickelvorrichtung einer Nähmaschine

Country Status (5)

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EP (1) EP2455524A1 (de)
JP (1) JP2012105837A (de)
KR (1) KR20120053960A (de)
CN (1) CN102535041A (de)
TW (1) TW201245531A (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110878449B (zh) * 2019-12-23 2021-10-26 拓卡奔马机电科技有限公司 绕线装置及缝纫机

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3533369A (en) * 1967-07-13 1970-10-13 Pfaff Ag G M Bobbin threading device for sewing machines
DE2022389A1 (de) * 1970-05-08 1971-12-02 Jeppener Paul Otto Vorrichtung fuer Steppstichnaehmaschinen zum Spulen des Greiferfadens
DE7803296U1 (de) * 1978-02-04 1978-10-26 Kochs Adler Ag, 4800 Bielefeld Naehmaschinen-spulvorrichtung. 700905
US20030010270A1 (en) * 2001-05-31 2003-01-16 Juki Corporation Lower thread winding device
EP2088229A1 (de) * 2008-02-07 2009-08-12 Dürkopp Adler AG Nähmaschine sowie Spuleinrichtung für eine derartige Nähmaschine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3533369A (en) * 1967-07-13 1970-10-13 Pfaff Ag G M Bobbin threading device for sewing machines
DE2022389A1 (de) * 1970-05-08 1971-12-02 Jeppener Paul Otto Vorrichtung fuer Steppstichnaehmaschinen zum Spulen des Greiferfadens
DE7803296U1 (de) * 1978-02-04 1978-10-26 Kochs Adler Ag, 4800 Bielefeld Naehmaschinen-spulvorrichtung. 700905
US20030010270A1 (en) * 2001-05-31 2003-01-16 Juki Corporation Lower thread winding device
EP2088229A1 (de) * 2008-02-07 2009-08-12 Dürkopp Adler AG Nähmaschine sowie Spuleinrichtung für eine derartige Nähmaschine
JP2009183706A (ja) 2008-02-07 2009-08-20 Duerkopp Adler Ag ミシン、およびこの種のミシン用の糸巻き装置

Also Published As

Publication number Publication date
CN102535041A (zh) 2012-07-04
TW201245531A (en) 2012-11-16
JP2012105837A (ja) 2012-06-07
KR20120053960A (ko) 2012-05-29

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