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EP2357273B1 - Mechanismus zum Anbringen und Abnehmen der Spulenkapsel einer Nähmaschine - Google Patents

Mechanismus zum Anbringen und Abnehmen der Spulenkapsel einer Nähmaschine Download PDF

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Publication number
EP2357273B1
EP2357273B1 EP11001023A EP11001023A EP2357273B1 EP 2357273 B1 EP2357273 B1 EP 2357273B1 EP 11001023 A EP11001023 A EP 11001023A EP 11001023 A EP11001023 A EP 11001023A EP 2357273 B1 EP2357273 B1 EP 2357273B1
Authority
EP
European Patent Office
Prior art keywords
bobbin case
bracket
needle plate
loop taker
bobbin
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.)
Not-in-force
Application number
EP11001023A
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English (en)
French (fr)
Other versions
EP2357273A1 (de
Inventor
Atsuo YAMAOKA
Akihiro Kai
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.)
Aisin Corp
Original Assignee
Aisin Seiki 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 Aisin Seiki Co Ltd filed Critical Aisin Seiki Co Ltd
Publication of EP2357273A1 publication Critical patent/EP2357273A1/de
Application granted granted Critical
Publication of EP2357273B1 publication Critical patent/EP2357273B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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

Definitions

  • This disclosure relates to a bobbin case removing and attaching mechanism for a loop taker mounted at a sewing apparatus.
  • a known bobbin case removing and attaching mechanism for a loop taker mounted at a sewing apparatus is disclosed in JPS57-38278B (hereinafter referred to as Reference 1).
  • the loop taker disclosed in Reference 1 includes a movable rotation stopper having two engagement pieces, at least one of which engages with a bobbin case.
  • the loop taker also includes an operation member rotatably connected to a pin that is fixed to a sewing machine bed. One end of the operation member is normally positioned to be slightly away from the movable rotation stopper.
  • the operation member includes an operation portion that is operated by a protrusion formed at a position restricting member of the bobbin case in a case where the position restricting member moves to a release position.
  • the operation member releases the engagement between one of the engagement pieces of the movable rotation stopper and the bobbin case by means of the operation portion regardless of a rotational phase of the loop taker.
  • the operation member causes the other of the engagement pieces of the movable rotation stopper to be positioned at an upper side of a release portion of the bobbin case.
  • the bobbin case removing and attaching mechanism is activated, thereby engaging the protrusion with the operation portion and pressing the operation portion. Because the operation portion is pressed, the movable rotation stopper rotates to release the engagement between the bobbin case and the movable rotation stopper. As a result, the bobbin case is removable from the loop taker. On the other hand, in a case where the bobbin case is inserted to the loop taker so as to be attached thereto, one of the engagement pieces is inserted into a groove formed at the bobbin case. Thus, a failure of the arrangement position of the bobbin case at the loop taker is unlikely to occur.
  • the sewing machine includes a sewing machine bed, a loop taker arranged for rotation about a vertical axis and accommodated within the bed, the loop taker having a rim that extends in a direction perpendicular to the vertical axis and an open ended hollow cavity of which an end opens towards the rim, and a bobbin case arranged within the loop taker and having a flange.
  • the sewing machine also includes a bracket removably attached to the bed and having an opening at a center, the bracket restraining a movement of the bobbin case within the cavity and providing a clearance for a passage of a thread relative to the bobbin case.
  • the bracket is placed on one end surface of the flange of the bobbin case at two portions.
  • the sewing machine further includes a first support portion provided at the bracket and positioned on one side of a plane containing the vertical axis of the loop taker, and a second support portion positioned on the rim and having less than 180° of angular displacement, the second support portion being positioned on the other side of the plane together with the two portions of the bracket.
  • the sewing machine still further includes a vertical wall provided at the first support portion so as to make contact with the bobbin case. According to the aforementioned sewing machine, the bobbin case is retained in operational engagement with the rim. The bobbin case is removed from an operating position at the loop taker after the bracket is removed therefrom.
  • a recess is formed at one of the two portions of the bracket that is placed on the end surface of the flange of the bobbin case.
  • a tab is formed at the flange of the bobbin case so as to engage with the recess. As a result, the rotational movement of the bobbin case is restricted.
  • the bobbin case is unlikely to be arranged at a wrong position at the loop taker when the bobbin case is inserted into the loop taker, it is difficult to observe one of the engagement pieces because the engagement piece is arranged below a needle plate. Therefore, it is difficult to insert the engagement piece into the groove of the bobbin case, which may hinder the arrangement of the bobbin case at the loop taker.
  • a number of components constituting a complex link mechanism are provided around the loop taker. As a result, accurate positioning of the components is difficult because of manufacturing tolerances of the components. Further, a cost of the bobbin case removing and attaching mechanism may increase due to the complex structure thereof.
  • a bobbin case removing and attaching mechanism for a loop taker includes a loop taker arranged within a work supporting bed for a sewing apparatus and rotatable about an axis of the loop taker, a bobbin case inserted into an upwardly opening bobbin case accommodating portion formed in the loop taker, a bracket mounted on a fixing member on the work supporting bed, the said bracket including an opening through which the bobbin case passes when the bobbin case is inserted into or removed from the bobbin case accommodating portion, and a needle plate attached to an upper portion of the bracket and closing at least a portion of the opening of the bracket, the needle plate including a bobbin case stopper piece which restricts an upward movement of the bobbin case when the bobbin case is inserted into the bobbin case accommodating portion and arranged at an operating position thereof, wherein when the needle plate is attached to the bracket with the bobbin case in the bobbin case accommodating portion, the bobbin case is retained at the operating position with movement of
  • the needle plate is removed in a state where the bracket is fixed to the fixing member to thereby remove or attach the bobbin case relative to the bobbin case accommodating portion of the loop taker. Therefore, the removing and attaching of the bobbin case is simply performed and operability thereof may increase.
  • a vibration is constantly generated so as to dislocate the bobbin case from the operating position at the loop taker.
  • a force for dislocating the bobbin case from the operating position may occur because of the vibration, and the like.
  • the bobbin case is retained at the predetermined operating position in the loop taker because the bobbin case is restrained from moving by the bracket and the bobbin case stopper piece.
  • the bobbin case is restrained from moving so as to be positioned on an upper surface of the loop taker.
  • Appropriate stitches may be obtained according to the aforementioned bobbin case removing and attaching mechanism.
  • the operating position of the bobbin case is restricted by the bracket and the bobbin case stopper piece, thereby simplifying the configuration of the mechanism and obtaining a reduced manufacturing cost.
  • the bracket includes a rotation restricting portion restricting an insertion direction of the bobbin case and restricting a rotation of the bobbin case, and a guide portion making contact with a portion of an upper side surface of the bobbin case when the bobbin case is inserted into the bobbin case accommodating portion and restricting an upward movement of the bobbin case, and wherein clearances through each of which a needle thread passes are formed between the rotation restricting portion and the bobbin case and between the guide portion and the bobbin case respectively.
  • the position of the bobbin case in the rotational direction is restricted by the rotation restricting portion while the insertion position of the bobbin case in the upward direction is restricted by the guide portion.
  • the bobbin case is insertable only in a predetermined direction to the predetermined operating position in the bobbin case accommodating portion of the loop taker.
  • the bobbin case that is inserted into the bobbin case accommodating portion is removable only from a direction opposite from the aforementioned predetermined direction.
  • a broken thread because of a blocking of a path of a needle thread, and the like, that occurs in a case where the bobbin case is dislocated from the predetermined operating position, may be restrained to thereby achieve appropriate stitches.
  • the guide portion is formed by a downward bending of a portion at an edge of the opening of the bracket.
  • the bobbin case stopper piece includes elasticity to press the bobbin case.
  • a dimensional tolerance between the needle plate and the bobbin case may be absorbed by means of the elasticity.
  • the bobbin case stopper piece is formed separately from the needle plate and is removably fixed to a lower surface of the needle plate.
  • a structure of the needle plate may be simplified as compared to a case where the bobbin case stopper piece is integrally formed with the needle plate.
  • the bobbin case stopper piece is an elongated member made of metal and fixed to the lower surface of the needle plate in a cantilever manner.
  • the elasticity of the bobbin case stopper piece is adjustable by changing a length of the bobbin case stopper piece.
  • the bobbin case stopper piece is made of metal, an increase of dimensions of the bobbin case stopper piece is avoidable as compared to a case where the bobbin case stopper piece is formed by a resin molding.
  • the bobbin case stopper piece is formed separately from the needle plate, the bobbin case stopper piece including a base portion fixed to the lower surface of the needle plate and a free end portion being apart from the lower surface of the needle plate by a predetermined distance.
  • That structure of the needle plate may be simplified as compared to a case where the bobbin case stopper piece is integrally formed with the needle plate.
  • An appropriate change of a length between the free end portion and the lower surface of the needle plate may adjust a magnitude of the elasticity of the bobbin case stopper piece.
  • the bobbin case stopper piece is made of metal.
  • the increase of dimensions of the bobbin case stopper piece is avoidable as compared to the case where the bobbin case stopper piece is formed by the resin molding.
  • Fig. 1 is an exploded perspective view of a bobbin case removing and attaching mechanism for a loop taker according to an embodiment
  • Fig. 2 is a perspective view of a bracket illustrated in Fig. 1 when viewed from a lower side of Fig. 1 ;
  • Fig. 3 is a plan view in a state where a needle plate is removed from the bobbin case removing and attaching mechanism
  • Fig. 4 is a plan view of the bobbin case removing and attaching mechanism
  • Fig. 5 is a cross-sectional view taken along the line V-V illustrated in Fig. 4 ;
  • Fig. 6 is a perspective view illustrating a positional relationship between a bobbin case, the bracket, and a bobbin case stopper piece.
  • a bobbin case removing and attaching mechanism 10 (a bobbin case removing and attaching mechanism for a loop taker) includes a loop taker 1 mounted at an inner side of a carrier plate 3 (fixing member) that is attached to a sewing machine bed (a work supporting bed) of a sewing machine (a sewing apparatus), a bracket 4 fixed to a flange 31 of the carrier plate 3, a bobbin case 2 inserted into the loop taker 1, and a needle plate 5 fixed to an upper surface 4a of the bracket 4.
  • the loop taker 1 is formed substantially into a cylindrical shape constituted by a cylindrical portion which is partially cut out and a bottom portion.
  • the loop taker 1 includes a bobbin case accommodating portion 13 of which an upper side in Fig. 1 opens, a notch end 14 formed at a portion of the cylindrical portion, an upper surface 12, and a race surface 11 formed at an upper side of the cylindrical portion.
  • the loop taker 1 rotates about a rotational axis Z (an axis) (see Fig. 5 ) thereof in a counterclockwise direction when viewed from an upper side in Fig. 5 , the notch end 14 catches a needle thread, thereby forming stitches.
  • the bobbin case 2 includes a bobbin accommodating portion 23 of which an upper side in Fig. 1 opens so as to accommodate a bobbin on which a bobbin thread is wound. A portion of an upper side wall of the bobbin accommodating portion 23 is cut to form into a thin shape to thereby obtain a bobbin removing portion 22.
  • a flange surface 29 that makes contact with the race surface 11 of the loop taker 1 is formed at an outer peripheral surface 28b of the bobbin case 2.
  • the outer peripheral surface 28b is formed to be perpendicular to an inner peripheral surface 28a of the bobbin case 2.
  • the bobbin is accommodated at the inner peripheral surface 28a at an axially intermediate portion of the bobbin case 2.
  • a protruding portion 21 is formed at a portion of the outer peripheral surface 28b that faces a connecting portion between the bobbin removing portion 22 and the bobbin accommodating portion 23. Then, an inclination portion 26 including ribs 26a, 26b, 26c, and 26d (see Figs. 1 and 3 ) is formed at a portion of the outer peripheral surface 28b at substantially 90° relative to the protruding portion 21 in a clockwise direction as seen in Fig. 1 .
  • a radially outer surface of the rib 26a forms a reverse rotation stopper surface 24 (see Figs. 1 , 3 and 6 ) that is parallel to an axis of the inner peripheral surface 28a and is perpendicular to a feeding direction of a feed dog 7.
  • the reverse rotation stopper surface 24 is parallel to an arrow A in Fig. 3 .
  • a plane surface portion 25 i.e., a portion of an upper side surface of the bobbin case 2 is formed to be perpendicular to the reverse rotation stopper surface 24.
  • the plane surface portion 25 is positioned to be lower than an upper-right portion (an upper-right surface portion) 27 of the bobbin case 2 formed at the bobbin removing portion 22.
  • the plane surface portion 25, the inclination portion 26, and the upper-right portion 27 constitute the upper side surface of the bobbin case 2.
  • the carrier plate 3 is formed into a channel shape by a bending of a plate member.
  • the carrier plate 3 includes the flanges 31 at upper left and right sides in Fig. 1 .
  • Internal threads 32 are formed at the flanges 31 so as to secure the bracket 4.
  • the bracket 4 is formed by a plate member that is bent.
  • the bracket 4 includes an opening 45 at a center.
  • a thread release portion 44 serving as a rotation restricting portion and a support portion 40 serving as a portion of an opening edge are formed at a rear surface 4b of the bracket 4.
  • the support portion 40 is bent to be substantially perpendicular to the rear surface 4b.
  • the support portion 40 includes a rotation direction support portion 42 serving as the rotation restricting portion and a vertical direction support portion 41 serving as a guide portion.
  • the rotation direction support portion 42 is provided at a right side in the support portion 40 in Fig. 2 (i.e., a side surface at a front side of the sewing apparatus) so as to be perpendicular to the rear surface 4b.
  • the vertical direction support portion 41 is formed at a lower surface of the bracket 4 perpendicular to the rotation direction support portion 42 (i.e., a lower surface parallel to the rear surface 4b).
  • an elongated bore 46 opens at the rear surface 4b in the vicinity of the rotation direction support portion 42.
  • a vertical direction sub-support portion 43 is formed at an edge of the rear surface 4b along a longitudinal direction of the elongated bore 46.
  • the vertical direction support portion 41 is formed and positioned in such a manner that the plane surface portion 25 of the bobbin case 2 can be inserted into a space formed between the vertical direction support portion 41 and the race surface 11 of the loop taker 1 from an obliquely upward side of the opening 45 to an obliquely downward side thereof in the arrow A direction (see Fig. 3 ). That is, according to the present embodiment, the vertical direction support portion 41 is formed at a distant portion of a peripheral edge of the opening 45 in a direction from which the bobbin case 2 is inserted.
  • the vertical direction sub-support portion 43 is formed and positioned in such a manner that the inclination portion 26 of the bobbin case 2 can be inserted into a space formed between the vertical direction sub-support portion 43 and the race surface 11 of the loop taker 1 from the obliquely upward side of the opening 45 to the obliquely downward side thereof in the arrow A direction (see Fig. 3 ). That is, according to the present embodiment, the vertical direction sub-support portion 43 is formed at a closer portion of the peripheral edge of the opening 45 in the direction from which the bobbin case 2 is inserted.
  • the bracket 4 includes four bores 47 into which bracket stopper screws 48 (see Fig. 1 ) are inserted and two internal threads 49 with which needle plate fixing screws 53 (see Fig. 1 ) are meshed.
  • the needle plate 5 includes an opening 51 having substantially a U-shape, bores 52 into which the needle plate fixing screws 53 are inserted, and multiple opening grooves 54 for the feed dog 7.
  • the needle plate 5 also includes a bobbin case stopper piece 6.
  • One end (i.e., a base portion) of the bobbin case stopper piece 6 is attached or fixed to a rear surface 5b (lower surface) of the needle plate 5 in Fig. 1 while the other end (i.e., a free end portion, which is apart from the rear surface 5b of the needle plate 5 by a predetermined distance) of the bobbin case stopper piece 6 is positioned within the opening 51.
  • the other end of the bobbin case stopper piece 6 extends over the upper-right portion 27 of the bobbin case 2.
  • the other end of the bobbin case stopper piece 6 desirably extends beyond an outer edge of the upper-right portion 27 that is positioned in the vicinity of an inner side surface 45a of the opening 45 formed at a front side thereof as illustrated in Fig. 6 .
  • the bobbin case stopper piece 6 is provided to restrict an upward movement of the bobbin case 2 that is inserted into the bobbin case accommodating portion 13 of the loop taker 1.
  • the bobbin case stopper piece 6 includes elasticity to press the bobbin case 2.
  • the bobbin case stopper piece 6 may be formed separately from the needle plate 5 and be removably fixed to the rear surface 5b of the needle plate 5.
  • the bobbin case stopper piece 6 may be an elongated member made of metal and fixed to the rear surface 5b of the needle plate 5 in a cantilever manner.
  • the loop taker 1 is mounted at the carrier plate 3 fixed to the sewing machine bed of the sewing apparatus and is connected to a main shaft thereof that rotates the loop taker 1 in a counterclockwise direction when viewed from an upper side in Fig. 1 .
  • the bracket stopper screws 48 inserted into the bores 47 of the bracket 4 are meshed with the internal threads 32 formed at the flanges 31 of the carrier plate 3, thereby fixing the bracket 4 to the flanges 31.
  • the bobbin case 2 is moved from the obliquely upward side (according to the embodiment, from the obliquely rightward and upward side) of the opening 45 of the bracket 4 in the arrow A direction towards the obliquely downward side (according to the embodiment, towards the obliquely leftward and downward side) of the opening 45 in a state where the reverse rotation stopper surface 24 of the bobbin case 2 is positioned to be substantially parallel to the arrow A, so that the bobbin case 2 is inserted into the bobbin case accommodating portion 13 of the loop taker 1.
  • the bobbin case 2 is inserted into the loop taker 1 only in the arrow A direction in Fig. 3 , i.e., from the obliquely upward side to the obliquely downward side of the opening 45, which will be explained later in details.
  • the needle plate 5 is attached to the upper surface 4a of the bracket 4 as illustrated in Figs. 1 and 4 .
  • the needle plate fixing screws 53 inserted into the bores 52 of the needle plate 5 are meshed with the internal threads 49 (see Figs. 1 and 2 ) to thereby fix the needle plate 5 to the bracket 4. Consequently, the assembly of the bobbin case removing and attaching mechanism 10 is completed.
  • the bobbin case 2 is removable from the bobbin case accommodating portion 13 of the loop taker 1 by being pulled to the obliquely upward side (according to the embodiment, to the obliquely rightward and upward side) of the opening 45, specifically, in a direction of an arrow B (see Fig. 3 ) opposite from the arrow A, after the needle plate 5 is removed from the bracket 4, which will be explained later.
  • a positional relationship between the bobbin case 2 mounted at the bobbin case accommodating portion 13 of the loop taker 1 and the bobbin case stopper piece 6 provided at the loop taker 1 and the needle plate 5 is as follows. As illustrated in Figs. 1 and 5 , the flange surface 29 of the bobbin case 2 is seated on or contactable with an upper portion of the race surface 11 of the loop taker 1. At this time, a clearance is formed between the upper-right portion 27 of the bobbin case 2 and a bottom surface 6b of the bobbin case stopper piece 6 so that the needle thread easily passes through the clearance.
  • the vertical movement of the bobbin case 2 is limited to an extent of the size of the clearance through which the needle thread passes, thereby restricting the vertical movement of the bobbin case 2.
  • the downward movement of the bobbin case 2 is restricted by the race surface 11.
  • a clearance through which the needle thread passes is formed between the protruding portion 21 of the bobbin case 2 and the thread release portion 44 of the bracket 4.
  • the rotational movement of the bobbin case 2 in the counterclockwise direction when viewed from the upper side of the bobbin case 2 is limited to the size of the clearance through which the needle thread passes, thereby restricting the rotational movement of the bobbin case 2 in the counterclockwise direction.
  • a clearance through which the needle thread passes is formed between the reverse rotation stopper surface 24 of the bobbin case 2 and the rotation direction support portion 42 of the bracket 4.
  • the rotational movement of the bobbin case 2 in the clockwise direction when viewed from the upper side of the bobbin case 2 is limited to the size of the clearance through which the needle thread passes, thereby restricting the rotational movement of the bobbin case 2 in the clockwise direction.
  • a clearance through which the needle thread passes is formed between the plane surface portion 25 of the bobbin case 2 and the vertical direction support portion 41 of the bracket 4.
  • the plane surface portion 25 of the bobbin case 2 makes contact with the vertical direction support portion 41 (i.e., the vertical direction support portion 41 is in contact with a portion of an upper side surface of the bobbin case 2)
  • the upward movement of the bobbin case 2 in the vicinity of the vertical direction support portion 41 is limited to an extent of the size of the clearance, thereby restricting the upward movement of the bobbin case 2.
  • a clearance through which the needle thread passes is formed between the inclination portion 26 of the bobbin case 2 and the vertical direction sub-support portion 43 of the bracket 4.
  • the upward movement of the bobbin case 2 in the vicinity of the vertical direction sub-support portion 43 is limited to the size of the clearance, thereby restricting the upward movement of the bobbin case 2.
  • an operating position of the bobbin case 2 in the upward direction is retained by the contact of the bottom surface 6b of the bobbin case stopper piece 6, the vertical direction support portion 41 of the bracket 4, and the vertical direction sub-support portion 43 of the bracket 4 with three portions of the bobbin case 2 respectively.
  • An operating position of the bobbin case 2 in the downward direction is retained by the contact between the flange surface 29 of the bobbin case 2 and the race surface 11 of the loop taker 1.
  • An operating position of the bobbin case 2 in the rotational direction is retained by the contact between the reverse rotation stopper surface 24 and the rotation direction support portion 42, and the contact between the protruding portion 21 and the thread release portion 44.
  • the bobbin case is first positioned relative to the loop taker.
  • the position of the bobbin case in the rotational direction is defined by a positioning member, thereby arranging the bobbin case at the operating position appropriate to form stitches.
  • the bobbin case is removed from the loop taker so that the lint or waste can be cleared away.
  • the bobbin case is again reattached to a predetermined position at the loop taker.
  • the bobbin case 2 is removed from the bobbin case accommodating portion 13 of the loop taker 1 so as to clear away the lint or waste within the bobbin case accommodating portion 13 of the loop taker 1. After the bobbin case accommodating portion 13 is cleaned, the bobbin case 2 that is removed should be reattached to the predetermined operating position of the loop taker 1. The removal and attachment of the bobbin case 2 is conducted as follows.
  • the needle plate fixing screws 53 are unscrewed by a screw driver attached to the sewing apparatus so as to remove the needle plate 5 from the bracket 4.
  • substantially a full upper portion of the bobbin case 2 that is half covered by the needle plate 5 is visually confirmable as illustrated in Fig. 3 .
  • the bobbin case 2 is pulled out to the obliquely upward side of the opening 45, i.e., in the arrow B direction, so as to remove the bobbin case 2 from the bobbin case accommodating portion 13.
  • the lint or waste within the loop taker 1 is removed to thereby complete the cleaning.
  • the removal of the bobbin case 2 is achievable only in the aforementioned direction (i.e., the arrow B direction).
  • the bobbin case 2 After the cleaning of the bobbin case accommodating portion 13, the bobbin case 2 is reattached to the predetermined position at the loop taker 1 and thereafter the needle plate 5 is attached to the bracket 4.
  • the bobbin case 2 In case of reattaching the bobbin case 2 to the predetermined position of the loop taker 1, the bobbin case 2 is moved from the obliquely upward side of the opening 45 to the obliquely downward side thereof in the arrow A direction to thereby insert the bobbin case 2 to the bobbin case accommodating portion 13 of the loop taker 1.
  • Such insertion is achievable because of the shapes of the protruding portion 21, the reverse rotation stopper surface 24, and the plane surface portion 25 of the bobbin case 2 and the shapes of the vertical direction support portion 41 and the rotation direction support portion 42 of the bracket 4.
  • the bobbin case 2 is reattached to the previous position before being removed, i.e., the predetermined operating position at the bobbin case accommodating portion 13.
  • the insertion (attachment) of the bobbin case 2 is achievable only in the aforementioned direction (i.e., the arrow A direction).
  • the insertion direction and the removal direction of the bobbin case 2 relative to the loop taker 1 is limited in the arrow A direction from the obliquely upward side of the opening 45 and in the arrow B direction to the obliquely upward side of the opening 45 respectively.
  • the clearance through which the needle thread easily passes is formed between the projecting portion 21 of the bobbin case 2 and the thread release portion 44 of the bracket 4.
  • the rotation of the bobbin case 2 is restricted within the size of the clearance through which the needle thread passes.
  • the rotation of the bobbin case 2 in the counterclockwise direction when viewed from the upper side of the bobbin case 2 is restricted by the contact between the protruding portion 21 of the bobbin case 2 with the thread release portion 44 of the bracket 4.
  • the clearance through which the needle thread easily passes is formed between the reverse rotation stopper surface 24 of the bobbin case 2 and the rotation direction support portion 42 of the support portion 40 of the bracket 4.
  • the rotation of the bobbin case 2 is restricted within the size of the clearance through which the needle thread passes.
  • the rotation of the bobbin case 2 in the clockwise direction when viewed from the upper side of the bobbin case 2 is restricted by the contact between the reverse rotation stopper surface 24 of the bobbin case 2 with the rotation direction support portion 42 of the support portion 40 of the bracket 4.
  • the position of the bobbin case 2 in the rotational direction is restricted and thus the direction where the bobbin case 2 is inserted into the bobbin case accommodating portion 13 of the loop taker 1 is limited to the arrow A direction.
  • the plane surface portion 25 of the bobbin case 2 is specified so that the clearance through which the needle thread easily passes is formed relative to the vertical direction support portion 41 of the support portion 40 of the bracket 4.
  • the upward movement of the bobbin case 2 in the vicinity of the vertical direction support portion 41 is limited to the size of the clearance through which the needle thread passes.
  • the plane surface portion 25 of the bobbin case 2 makes contact with the vertical direction support portion 41 of the support portion 40 of the bracket 4, and the direction where the bobbin case 2 is removed from and attached to the bobbin case accommodating portion 13 is restricted to the obliquely upward side of the opening 45 as illustrated in Figs. 1 and 6 .
  • the plane surface portion 25 is inserted into the space formed between the vertical direction support portion 41 and the race surface 11 of the loop taker 1.
  • the inclination portion 26 of the bobbin case 2 is specified so that the clearance through which the needle thread easily passes is formed relative to the vertical direction sub-support portion 43 of the bracket 4.
  • the upward movement of the bobbin case 2 in the vicinity of the vertical direction sub-support portion 43 is limited to the size of the clearance.
  • the inclination portion 26 makes contact with the vertical direction sub-support portion 43 of the bracket 4, and the direction where the bobbin case 2 is removed from and attached to the bobbin case accommodating portion 13 is restricted to the obliquely upward side of the opening 45.
  • the inclination portion 26 is inserted into the space formed between the vertical direction sub-support portion 43 and the race surface 11 of the loop taker 1.
  • the insertion direction of the bobbin case 2 in the vertical direction is limited from the obliquely upward side of the opening 45 to the obliquely downside thereof.
  • the insertion of the bobbin case 2 to the loop taker 1 is restricted in the arrow A direction from the obliquely upward side of the opening 45 to the obliquely downward side thereof.
  • the removal direction of the bobbin case 2 is restricted in the arrow B direction from the obliquely downward side of the opening 45 to the obliquely upward side thereof.
  • either the third restriction manner or the fourth restriction manner may be applied.
  • the third restriction manner is more desirable than the fourth restriction manner because the contact is obtained by the two surfaces parallel to each other according to the third restriction manner while the contact is obtained by the two surfaces intersecting with each other according to the forth restriction manner.
  • a further secure retention of the operating position of the bobbin case 2 in the upward direction is obtained by the addition of the vertical direction sub-support portion 43.
  • the vertical direction sub-support portion 43 serves as the guide portion instead of the vertical direction support portion 41.
  • the bobbin case removing and attaching mechanism 10 is obtained while the bobbin case 2 that is inserted into the bobbin case accommodating portion 13 of the loop taker 1 is removable therefrom in a state where the needle plate 5 is removed from the loop taker 1.
  • the bobbin case 2 is insertable into the predetermined operating position at the bobbin case accommodating portion 13. Accordingly, the user easily inserts or attaches the bobbin case 2 at the predetermined operating position in the loop taker 1 and removes the bobbin case 2 from the loop taker 1.
  • a broken thread because of a blocking of a path of the needle thread, and the like that occurs in a case where the bobbin case 2 is dislocated from the predetermined operating position may be restrained to thereby achieve appropriate stitches.
  • a vibration is constantly generated so as to dislocate the bobbin case 2 from the predetermined operating position.
  • a force for dislocating the bobbin case 2 from the predetermined operating position may occur because of the vibration, and the like.
  • the movement of the bobbin case 2 in the vertical direction is restricted, within the size of the clearance through which the needle thread passes, because of the bottom surface 6b of the bobbin case stopper piece 6, the vertical direction support portion 41 and the vertical direction sub-support portion 43 of the support portion 40 of the bracket 4, and the race surface 11 of the loop taker 1.
  • the bobbin case 2 is restrained to move so as to be positioned on the upper surface 12 from the race surface 11 with which the bobbin case 2 is seated on, and the protruding portion 21 is restrained from forcibly engaging with an upper portion of the thread release portion 44.
  • the bobbin case 2 that is inserted into the loop taker 1 is retained at the predetermined operating position while the clearances through which the needle thread passes are secured. Consequently, according to the bobbin case removing and attaching mechanism 10 of the embodiment, a sewing malfunction such as the broken thread that may be caused by the reduced clearance is restrained, thereby forming the appropriate stitches.
  • the insertion and attachment of the bobbin case 2 relative to the loop taker 1 is obtained by removing the needle plate 5 from the bracket 4 in a state where the bracket 4 is fixed to the carrier plate 3.
  • the removal and attachment of the bobbin case 2 is easily performed, which may lead to an increase of operability.
  • the vertical direction support portion 41 and the rotation direction support portion 42 are formed by a downward bending of a portion of the support portion 40 at the opening edge of the bracket 4.
  • the thread release portion 44 is formed by a block member that is fixed to the rear surface 4b of the bracket 4.
  • the plane surface portion 25, the reverse rotation stopper surface 24, and the protruding portion 21 are formed at the bobbin case 2 in such a manner to be contactable with the vertical direction support portion 41, the rotation direction support portion 42, and the thread release portion 44 respectively.
  • the upper-right surface portion 37 is formed at the bobbin case 2 so as to make contact with the bobbin case stopper piece 6 that is fixed to the needle plate 5. Accordingly, the configuration of the bobbin case removing and attaching mechanism 10 is simplified to thereby achieve a cost reduction.

Landscapes

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

Claims (8)

  1. Mechanismus (10) zum Abnehmen und Anbringen eines Spulengehäuses, mit:
    einem Schlaufengreifer (1), der innerhalb eines Werkstückträgerbetts für eine Nähmaschine angeordnet ist und der um eine Achse (Z) des Schlaufengreifers (1) drehbar ist; und
    einem Spulengehäuse (2), das in einem sich nach oben öffnenden Spulengehäuse-Aufnahmeabschnitt (13) eingeführt ist, der in dem Schlaufengreifer (1) ausgebildet ist;
    dadurch gekennzeichnet, dass der Mechanismus (10) umfasst:
    eine Klammer (4), die an einem Fixierelement (3) an dem Werkstückträgerbett montiert ist, wobei die besagte Klammer (4) eine Öffnung (45) enthält, durch die das Spulengehäuse (2) hindurch tritt, wenn das Spulengehäuse (2) in den Spulengehäuse-Aufnahmeabschnitt (13) eingeführt oder von diesem abgenommen wird; und
    eine Nadelplatte (5), die an einem oberen Bereich der Klammer (4) angebracht ist und mindestens einen Bereich der Öffnung (45) der Klammer (4) verschließt, wobei die Nadelplatte (5) ein Spulengehäüse-Anschlagstück (6) enthält, das eine nach oben gerichtete Bewegung des Spulengehäuses (2) begrenzt, wenn das Spulengehäuse in den Spulengehäuse-Aufnahmeabschnitt (13) eingeführt und an einer Betriebsposition desselben angeordnet ist, wobei
    das Spulengehäuse (2) dann, wenn die Nadelplatte (5) an der Klammer (4) angebracht ist und sich das Spulengehäuse (2) in dem Spulengehäuse-Aufnahmeabschnitt (13) befindet, an der Betriebsposition zurück gehalten wird, wobei eine Bewegung des Spulengehäuses (2) durch die Klammer (4) und das Spulengehäuse-Anschlagstück (6) begrenzt wird, und
    wobei das Spulengehäuse (2) von dem Spulengehäuse-Aufnahmeabschnitt (13) abgenommen oder an diesem angebracht werden kann, wenn die Nadelplatte (5) von der Klammer (4) entfernt ist und die Klammer (4) an dem Fixierelement (3) befestigt bleibt.
  2. Mechanismus (10) zum Abnehmen und Anbringen eines Spulengehäuses nach Anspruch 1, bei dem die Klammer (4) einen Drehungsbegrenzungsabschnitt (42, 44) enthält, der eine Einführungsrichtung des Spulengehäuses (2) begrenzt und eine Drehung des Spulengehäuses (2) beschränkt, und einen Führungsabschnitt (41) zur Herstellung eines Kontakts mit einem Abschnitt einer oberseitigen Oberfläche des Spulengehäuses (2) umfasst, wenn das Spulengehäuse (2) in den Spulengehäuse-Aufnahmeabschnitt (13) eingeführt ist und eine nach oben gerichtete Bewegung des Spulengehäuses (2) begrenzt, und wobei Freiräume, durch die jeweils ein Nadelfaden hindurch tritt, jeweils zwischen dem Drehungsbegrenzungsabschnitt (42, 44) und dem Spulengehäuse (2) bzw. zwischen dem Führungsabschnitt (41) und dem Spulengehäuse (2) ausgebildet sind.
  3. Mechanismus (10) zum Abnehmen und Anbringen eines Spulengehäuses nach Anspruch 2, bei dem der Führungsabschnitt (41) durch einen nach unten gebogenen Teil eines Abschnitts an einem Rand der Öffnung (45) der Klammer (4) ausgebildet ist.
  4. Mechanismus (10) zum Abnehmen und Anbringen eines Spulengehäuses nach Anspruch 1, bei dem das Spulengehäuse-Anschlagstück (6) eine Elastizität zum Drücken auf das Spulengehäuse (2) aufweist.
  5. Mechanismus (10) zum Abnehmen und Anbringen eines Spulengehäuses nach Anspruch 4, bei dem das Spulengehäuse-Anschlagstück (6) separat von der Nadelplatte (5) ausgebildet ist und an einer unteren Oberfläche (5b) der Nadelplatte (5) abnehmbar befestigt ist.
  6. Mechanismus (10) zum Abnehmen und Anbringen eines Spulengehäuses nach Anspruch 5, bei dem das Spulengehäuse-Anschlagstück (6) ein langgestrecktes Element ist, das aus Metal hergestellt ist und an der unteren Oberfläche (5b) der Nadelplatte (5) in einer Auslegermanier befestigt ist.
  7. Mechanismus (10) zum Abnehmen und Anbringen eines Spulengehäuses nach Anspruch 4, bei dem das Spulengehäuse-Anschlagstück (6) separat von der Nadelplatte (5) ausgebildet ist und das Spulengehäuse-Anschlagstück (6) einen Basisabschnitt, der an der unteren Oberfläche (5b) der Nadelplatte (5) befestigt ist, und einen freien Endabschnitt aufweist, der von der unteren Oberfläche (5b) der Nadelplatte (5) mit einem vorbestimmten Abstand beabstandet ist.
  8. Mechanismus (10) zum Abnehmen und Anbringen eines Spulengehäuses nach Anspruch 7, bei dem das Spulengehäuse-Anschlagstück (6) aus Metall gefertigt ist.
EP11001023A 2010-02-12 2011-02-08 Mechanismus zum Anbringen und Abnehmen der Spulenkapsel einer Nähmaschine Not-in-force EP2357273B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2010028450A JP5696363B2 (ja) 2010-02-12 2010-02-12 水平釜の内釜着脱機構

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EP2357273A1 EP2357273A1 (de) 2011-08-17
EP2357273B1 true EP2357273B1 (de) 2012-03-21

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EP11001023A Not-in-force EP2357273B1 (de) 2010-02-12 2011-02-08 Mechanismus zum Anbringen und Abnehmen der Spulenkapsel einer Nähmaschine

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JP (1) JP5696363B2 (de)
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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013202147A (ja) 2012-03-28 2013-10-07 Brother Ind Ltd ミシンモジュールおよびミシン

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3416472A (en) * 1967-04-26 1968-12-17 Singer Co Construction of bobbin case rotation restraining means
US3587494A (en) * 1970-03-04 1971-06-28 Singer Co Control mechanisms for bobbin thread replenishing apparatus
US3693565A (en) * 1971-04-20 1972-09-26 Singer Co Lockstitch loop takers for sewing machines
JPS5313462U (de) * 1976-07-17 1978-02-03
JPS558703A (en) * 1978-07-03 1980-01-22 Janome Sewing Machine Co Ltd Inner unit pattern mountinggandddemounting mechanism in horizontal unit pattern
US4355590A (en) * 1979-07-09 1982-10-26 The Singer Company Variable bobbin thread control for lockstitch looptaker
US4380961A (en) * 1981-03-23 1983-04-26 The Singer Company Variably controllable bobbin thread pull-off mechanism
JPS6038476Y2 (ja) * 1981-08-12 1985-11-16 ブラザー工業株式会社 水平釜の開閉装置
JP3014478B2 (ja) * 1991-04-03 2000-02-28 花王株式会社 農園芸用殺生剤効力増強剤

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EP2357273A1 (de) 2011-08-17
JP2011161073A (ja) 2011-08-25
CN102162179B (zh) 2013-03-27
ATE550471T1 (de) 2012-04-15
CN102162179A (zh) 2011-08-24
JP5696363B2 (ja) 2015-04-08

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