EP1828466B1 - Horizontal rotary hook for sewing machine - Google Patents
Horizontal rotary hook for sewing machine Download PDFInfo
- Publication number
- EP1828466B1 EP1828466B1 EP05825726A EP05825726A EP1828466B1 EP 1828466 B1 EP1828466 B1 EP 1828466B1 EP 05825726 A EP05825726 A EP 05825726A EP 05825726 A EP05825726 A EP 05825726A EP 1828466 B1 EP1828466 B1 EP 1828466B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- peripheral wall
- hook
- rotating hook
- reinforcing rib
- needle
- 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
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Classifications
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B57/00—Loop takers, e.g. loopers
- D05B57/08—Loop takers, e.g. loopers for lock-stitch sewing machines
- D05B57/10—Shuttles
- D05B57/14—Shuttles with rotary hooks
- D05B57/143—Vertical axis type
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B57/00—Loop takers, e.g. loopers
- D05B57/08—Loop takers, e.g. loopers for lock-stitch sewing machines
- D05B57/10—Shuttles
- D05B57/14—Shuttles with rotary hooks
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B57/00—Loop takers, e.g. loopers
- D05B57/08—Loop takers, e.g. loopers for lock-stitch sewing machines
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B57/00—Loop takers, e.g. loopers
- D05B57/08—Loop takers, e.g. loopers for lock-stitch sewing machines
- D05B57/10—Shuttles
Definitions
- the disclosure relates to a horizontal rotary hook for a sewing machine which includes an inner bobbin case holder for accommodating a bobbin and an outer rotating hook for accommodating the bobbin case holder, and more particularly to such a horizontal rotary hook in which the rotating hook includes a peripheral wall having an end defining a needle-thread passing opening.
- a horizontal rotary hook providing an easy replacement of a bobbin has conventionally been used in sewing machines.
- the horizontal rotary hook comprises an outer rotating hook having a sliding surface and an inner bobbin case holder accommodating a thread bobbin therein and supported in the rotating hook so as to be rotatable relative to the sliding surface.
- the rotating hook is formed into a cylindrical container with an upper opening.
- the rotating hook includes a peripheral wall on which a loop seizing beak is provided for seizing a loop of needle thread and which has a needle-thread passing opening through which a needle thread seized by the beak passes.
- the rotating hook is rotated in a predetermined direction by a sewing machine motor.
- the bobbin case holder is made of a synthetic resin so that a reduction is achieved in the weight and production cost thereof.
- the rotating hook has also been made of a synthetic resin recently.
- JP-U-S60-149388 discloses a horizontal rotary hook in which a beak member necessitating durability is made of a metal and mounted on the rotating hook so as to be laid on an inner surface of the peripheral wall of the rotating hook.
- JP-A-S58-97390 discloses a horizontal rotary hook in which a separate hook beak and a separate needle guard (a beak member) are disposed in an opening defined in the peripheral wall of the rotating hook to be mounted to the peripheral wall by small screws. The document discloses nothing about a material for the rotating hook.
- the peripheral wall of the rotating hook is made of a synthetic resin in the horizontal rotary hook disclosed by the former reference, JP-U-S60-149388 . Accordingly, an end of the rotating hook defining the needle-thread passing opening particularly has a low strength, so that there is a possibility that the end may be deformed or broken.
- JP-A-S58-97390 a part of the peripheral wall near the opening has an excessively large thickness, whereupon a predetermined strength is ensured.
- US 3,016,033 discloses a plastic rotating hook, that includes a peripheral wall with reinforcing rib and spokes on an outer wall surface of a wall, for mounting and reinforcing the connection between a loop taking hook and the wall. It further discloses a shuttle body adapted for use with an oscillatory shuttle-type sewing machine.
- US 4,660,487 discloses a loop taker, that has a loop taker body molded of resin in one piece, and a hook made of metal.
- a rotary shaft is fitted in the center of the loop taker, and a set screw threadedly inserted in the end of this rotary shaft holds down the loop taker.
- a pin fixedly installed on the rotary shaft is fitted in a radially extending groove in the loop taker, whereby the loop taker is connected to the rotary shaft so that it will not rotate relative to the rotary shaft.
- the invention as claimed in claim 1 solves the problem of how to increase the strength of the peripheral wall of the rotating hook while an increase in the size of the rotating hook is limited.
- the reinforcing rib is formed in the vicinity of the peripheral end defining the needle-thread passing opening of the rotating hook, the strength of the end of the peripheral wall facing the opening can be increased while an increase in the thickness of the peripheral wall of the rotating hook is limited. Furthermore, the aforesaid reinforcing rib may be provided on an inner surface of the peripheral wall. As a result, an outward force applied to the peripheral wall, namely, a tensile stress applied to the reinforcing rib can sufficiently be coped with, whereupon high reinforcing effect can be achieved. Furthermore, the entire size of the horizontal rotary hook can be prevented from being increased and accordingly, the production cost can be reduced.
- the invention further comprises an enlarged opening formed in the peripheral wall of the rotating hook so as to be defined at least by a second peripheral end of the peripheral wall of the rotating hook and so as to be continuous to the needle-thread passing opening, a beak member separate from the rotating hook and mounted on the rotating hook so as to close the enlarged opening, and a reinforcing rib provided on the peripheral wall of the rotating hook so as to be located in the vicinity of at least one of the first peripheral end defining the needle-thread passing opening and the second peripheral end defining the enlarged opening.
- the beak member is mounted on the rotating hook so as to close the enlarged opening although the beak member is separate from the rotating hook. Accordingly, since the peripheral wall and the beak member are avoided being laid on each other, the size of the rotating hook can be prevented from being increased. Furthermore, provision of the reinforcing rib can increase the strength of the end of the peripheral wall facing the needle-thread passing opening and the enlarged opening while an increase in the thickness of the peripheral wall of the rotating hook is limited.
- the reinforcing rib may be formed into a generally triangular shape. Additionally, when being sized so that a gap is defined between a sewing needle and the reinforcing rib in sewing, the reinforcing rib can be prevented from interference with the sewing needle.
- FIGS. 1A to 12 show a first embodiment of the invention.
- the invention is applied to a horizontal full rotary hook in which an outer rotating hook is continuously rotated in one direction.
- the sewing machine comprises a body 51 including a sewing bed 52 and a sewing arm 53 formed integrally with the bed so as to be mounted over the bed as shown in FIG. 1A .
- the arm 53 has a distal end having a needle bar 55 provided with a sewing needle 54.
- a needle bar 55 is moved vertically by a driving mechanism (not shown).
- a metal needle plate 56 is mounted on an upper surface of the bed 52 so as to be opposed to the needle bar 55 as shown in FIG. 1B .
- the needle plate 56 has a needle hole through which the needle 54 passes and a plurality of elongate slits 56b for actuation of a feed dog (not shown). Further, the needle plate 56 has a rectangular bobbin-accommodating hole 57 located in front of the needle hole 56a and the elongate slits 56b.
- the bobbin-accommodating hole 57 has two slide grooves 57a formed in right and left portions thereof (only the left slide groove being shown) respectively.
- a transparent slide lid 58 (see FIG. 1A ) is adapted to be inserted into the grooves 57a so as to be slidable front and back, thereby closing and opening the bobbin-accommodating hole 57.
- a cloth feed mechanism (not shown) is provided inside the bed 52 for driving the feed dog in synchronization with the vertical movement of the needle bar 55.
- a horizontal full rotary hook 1 of the embodiment is located below the bobbin-accommodating hole 57.
- the horizontal full rotary hook 1 includes a beak member 5 and an outer rotating hook 3 (see FIG. 2 ) horizontally rotated in synchronization with the vertical movement of the needle bar 55 and an inner bobbin case holder 2 (see FIG. 2 ).
- a bobbin 7 on which a bobbin thread 59 is wound is detachably accommodated in the inner rotating hook bobbin case holder 2 as shown in FIG. 1B .
- a plastic presser plate 60 is mounted on the underside of the needle plate 56 so as to be located in the bobbin-accommodating hole 57.
- the presser plate 60 has an opening through which the bobbin 7 is put into and taken out of the bobbin case holder 2.
- the presser plate 60 further has an engagement portion (not shown) formed on the underside thereof for engaging a rotation limiter 12 of the bobbin case holder 2, which limiter 12 will be described later.
- the horizontal full rotary hook 1 will now be described in detail with reference to FIGS. 2 to 12 .
- the bobbin case holder 2 will first be described.
- the bobbin case holder 2 is made of a synthetic resin such as nylon resin and formed into the shape of a substantially cylindrical shallow container.
- An interior of the bobbin case holder 2 serves as a bobbin-accommodating section 11 for accommodating the bobbin 7.
- the bobbin case holder 2 has a bottom with a centrally formed shaft 8 with which the bobbin 7 is to be fitted.
- the bobbin case holder 2 includes an outer periphery formed with the rotation limiter 12 located at the front as viewed in FIG. 3 and preventing rotation of the bobbin case holder 2.
- the outer periphery of the bobbin case holder 2 is further formed with a notch 10 located at an inner side as viewed in FIG. 3 and allowing the needle 54 to pass through the notch.
- the notch 10 has one end formed with a protruding thread guide 13.
- the bobbin-accommodating section 11 has an inner wall provided with a tensioning member (not shown) for tensioning a bobbin thread 59.
- the tensioning member comprises a thread tension bracket and a tension spring both of which are formed into an arc-shaped plate and mounted on the inner wall of the bobbin-accommodating section 11 in a superposed state.
- the rotating hook 3 includes a cylindrical receptacle-shaped hook body 4 having an open top, a beak member 5 to be mounted on the hook body 4 and a drive shaft 6 extending downward from the central underside of the hook body 4.
- the hook body 4 and the drive shaft 6 are each made of a synthetic resin such as nylon resin and are formed integrally with each other, for example, by injection molding.
- the beak member 5 is made of a synthetic resin such as polyimide resin.
- the material of the beak member 5 has a higher hardness than the material of the hook body 4.
- the beak member 5 is made of the synthetic resin, the beak member 5 can easily be made as a formed part, and the production cost of the beak member 5 can be reduced as compared with a beak member made of a metal.
- the hook body 4 has a disc-shaped bottom 21 and a peripheral wall 20 which is formed integrally with the bottom so as to rise from an outer circumference of the bottom.
- the hook body 4 has a slightly larger diameter than the bobbin case holder 2.
- the peripheral wall 20 includes a part formed into a needle-thread passing opening 22 through which a needle thread seized by the beak member 5 passes, as shown in FIGS. 5 to 7 .
- the wall 20 is further formed with an enlarged opening 23 (see FIG. 5 ) which is continuous to the side of the opening 22 opposed to the rotation direction A of the rotating hook and into which the beak member 5 is attached.
- the peripheral wall 20 has an upper end formed with an annular sliding surface 24 which is located at the inner peripheral side and is lower by one step than the top except for the openings 22 and 23.
- the bobbin case holder 2 has a lower end placed on the sliding surface 24 so as to be slidable thereon as shown in FIGS. 2 and 12 , whereupon the bobbin case holder 2 is adapted to be accommodated in the rotating hook 3 while floating slightly away from the bottom 21.
- Dashed line K in FIGS. 10 and 11 designates a movement locus of the lower end of the outer periphery of the bobbin case holder 2 sliding on the sliding surface 24.
- the drive shaft 6 is formed into the shape of a pipe and has a shaft hole 6a (See FIG. 5 ) vertically extending therethrough.
- the drive shaft 6 further has a worm-gear-like gear formed on the outer circumference thereof.
- a rotating hook shaft (not shown) is adapted to be inserted through the shaft hole 6a.
- the rotating hook shaft has a lower end fixed to a sewing machine frame (the bottom of the bed 52), thereby rotatably supporting the rotating hook 3.
- the gear of the drive shaft 6 is brought into mesh engagement with a driving gear of a hook driving mechanism (not shown) so that the rotating hook 3 is rotated via the aforesaid driving gear and drive shaft 6 in the hook rotating direction A.
- the beak member 5 is a component separate from the hook body 4 and is detachably attached to the hook body 4 in the embodiment.
- a mounting structure for the beak member 5 will be described in detail.
- the construction of the beak member 5 will firstly be described.
- the beak member 5 has a height equal to that of the outer circumferential wall 20 and is formed into the shape of a plate curved at the same curvature as the wall 20 as viewed from above, as shown in FIGS. 5 and 10 to 12.
- the beak member 5 is sized so as to close the aforesaid enlarged opening 23.
- the beak member 5 has substantially a lower half serving as a support wall 31 and an upper half serving as a beak peripheral wall 32 located at the outer periphery side of the lace 24.
- the beak peripheral wall 32 has an upper face including a forward side with respect to a rotation direction A of the rotating hook as shown in FIG. 12 .
- a guide face 32d is formed on the forward side of the upper face of the beak peripheral wall 32.
- the beak peripheral wall 32 further has a rearward side upper end formed with an outwardly protruding thread engagement step 32c as shown in FIG. 5 .
- the thread engagement step 32c is provided for engaging and locking the needle thread loop.
- the beak peripheral wall 32 also has an inner periphery including a horizontal thin plate-shaped beak body 33 formed integrally with the wall 32 so as to be located near to the lower side of the lace 24 (the side lower than the chain line K) as shown in FIGS. 4 , 6 and 10 to 12 .
- the beak body 33 has a forward side end with respect to the rotation direction A of the rotating hook.
- the forward side end of the beak body 33 is formed so as to extend toward the forward side by a predetermined dimension and so as to protrude inward.
- the beak peripheral wall 32 and beak body 33 constitute the thread capturing beak.
- two positioning pins 37 extend downward from the underside of the support wall 31 of the beak member 5 as shown in FIGS. 5 and 12 .
- a fixing block 34 is integrally formed on the inner periphery of the support wall 31 as shown in FIG. 10 .
- the fixing block 34 includes a bottom 36 mounted on the lower end of the support wall 31 and a pair of substantially triangular side walls 35 extending from opposite ends of the bottom 36.
- the bottom 36 is formed into a rectangular shape and has a centrally located fixing screw hole 36a.
- the hook body 4 is provided with a fitting holder 43 for holding the beak member 5.
- the fitting holder 43 includes a reinforcing peripheral wall 41 protruding outward from the peripheral wall 20 of the hook body 4 and supporting a lower outer face of the beak member 5 as shown in FIGS. 7 and 8 .
- the fitting holder 43 further includes a reinforcing bottom 40 which is continuous to the bottom 21 and constitutes the bottom of the fitting holder 43.
- the reinforcing peripheral wall 41 has an end having an inner reinforcing wall 42 which is formed adjacent to the inner face of the beak member 5 so as to be parallel with the reinforcing peripheral wall 41.
- Each of the peripheral walls 41 and 42 has a height set to about one third of the height of the peripheral wall 20, for example.
- the reinforcing peripheral wall 41 has both ends continuous to the peripheral wall 20. Furthermore, the reinforcing peripheral wall 41 has a corner located at the forward side with respect to the rotation direction A of the rotating hook as shown only in FIG. 7 .
- a columnar corner support 41a is formed on the corner so as to be located at the reinforcing bottom 40 side.
- the reinforcing bottom 40 continuous to the bottom 21 is formed into a generally T-shape as viewed on a plane so as to be located slightly lower than the bottom 21.
- the reinforcing bottom 40 has a screw hole 40a formed an inner part thereof so that the screw hole 40a corresponds to the screw hole 36a of the fixing block 34 of the beak member 5.
- the reinforcing bottom 40 further has a circular pin hole 40b for positioning the beak member 5 and an elongate circular pin hole 40c which is slightly longer laterally than the pin hole 40b. Accordingly, even if the distance between the positioning pins 37 has a dimensional error, the error can be absorbed by the elongate pin hole 40c. Consequently, the beak member 5 can be mounted on the rotating hook 3 reliably and accurately.
- the beak member 5 is fitted into a fitting holder 43 provided on the hook body 4 from above thereby to be mounted on the hook body 4, as shown in FIG. 5 .
- the two positioning pins 37 formed on the lower end of the beak member 5 are inserted into the pin holes 40b and 40c formed in the reinforcing bottom 40 respectively while the beak member 5 is guided by a reinforcing peripheral wall 41 and an inner reinforcing wall 42, whereby the beak member 5 is fitted in the fitting holder 43. Consequently, the beak member 5 can easily be positioned.
- the fixing screw 38 is inserted through the screw hole 40a from below and screwed into the screw hole 36a of the fixing block 34 (see FIG. 5 ), whereby the beak member 5 is adapted to be fixed to the rotating hook 3. Consequently, the beak member 5 can be fixed stably and mounted reliably. Furthermore, since the two positioning pins 37 are engaged with the pin holes 40b and 40v respectively, the strength of the rotating hook 3 can be increased so as to resist an instantaneous external stress even when thread entanglement or the like subjects the beak member 5 to the instantaneous external stress outwardly traveling.
- the corner support 41a, the reinforcing peripheral wall 41 and the inner reinforcing wall 42 are abutted against the beak member 5, thereby holding the beak member 5 in a vertical position. Consequently, since the beak member 5 is reinforced by the aforesaid abutment, the strength to overcome the above-described external stress can be ensured.
- the beak member 5 is mounted on the hook body 4 so as to close the enlarged opening 23, the thickness of the peripheral wall 20 need not be increased. Accordingly, the beak member 5 can be constituted as a member separate from the hook body 4 while an increase in the size of the rotating hook 3 is limited. Additionally, since the beak member 5 can be replaced individually, a replacing work can be simplified and accordingly, the maintenance cost can be reduced.
- a plurality of inclined surfaces 32a, 33a, 20a and 20b are adapted to be formed on the beak member 5 and the peripheral wall 20 of the hook body 4 in the injection molding in the embodiment. More specifically, as shown in FIG. 11 , the first inclined face 32a is formed on a forward end of the beak peripheral wall 32 with respect to the rotation direction A of the rotating hook 3. The first inclined face 32a is inclined forwardly outward. Furthermore, the second inclined face 33a is formed on a forward end of the beak body 33 with respect to the rotation direction A of the rotating hook 3 as shown in FIG. 11 . The second inclined face 33a is inclined forwardly downward.
- the third inclined face 20a is formed on an inner peripheral edge of the peripheral wall 20 fronting to the enlarged opening 23 and the beak member 5 as shown in FIGS. 6 and 11 .
- the third inclined face 20a is gently inclined forwardly outward.
- the fourth inclined face 20b is formed on a forward edge of the lace 24.
- the fourth inclined face 20b is inclined forwardly downward.
- the bobbin case holder 2 can smoothly be slid on the sliding surface 24 without collision against the beak member 5 and the peripheral end as the result of formation of the inclined surfaces 32a, 33a, 20a and 20b.
- the rotating hook 3 is formed with first and second reinforcing ribs 25 and 26 both located at an inner surface of the peripheral wall 20 of the hook body 4 and extending longitudinally as shown in FIG. 11 .
- Each rib interconnects outer peripheries of the peripheral wall 20 and the bottom 21 and comes closer to the peripheral wall 20 as a height thereof is increased.
- each of the reinforcing ribs 25 and 26 is formed into such a generally triangular shape that each reinforcing rib interconnects the peripheral wall 20 and an outer periphery of the bottom 21 of the rotating hook 3 and a sectional area of each reinforcing rib is rendered smaller as a height of each reinforcing rib is increased.
- Each reinforcing rib is formed integrally with the hook body 4 by injection molding, for example.
- the reinforcing ribs 25 and 26 are disposed so that the needle-thread passing opening 22 and the enlarged opening 23 are located between the ribs 25 and 26. More specifically, the first reinforcing rib 25 is located in the vicinity of the peripheral end of the peripheral wall 20 defining the enlarged opening 23 whereas the second reinforcing rib 26 is located in the vicinity of the peripheral end of the needle-thread passing opening 22.
- the second reinforcing rib 26 is sized so that a predetermined space S is defined between the sewing needle 54 and the rib 26.
- the second reinforcing rib 2 6 has a dimension L of inward protrusion which is set so that the rib 26 is prevented from contact with the needle 54.
- the first reinforcing rib 25 is provided integrally on the end of the peripheral wall 20 of the hook body 4 facing the enlarged opening 23
- the second reinforcing rib 26 is provided integrally on the end of the peripheral wall 20 facing the needle-thread passing opening 22. Consequently, the strength of each of the ends facing the openings 22 and 23 of the peripheral wall 20 of the hook body 4 can be increased without an increase in the thickness of each end.
- the strength of the peripheral wall 20 of the hook body 4 can be improved while the size of the rotating hook 3 is prevented from being increased and accordingly, occurrence of deformation or breakage can be prevented even when the peripheral wall 20 is subjected to an external force.
- FIGS. 4 and 6 show a movement locus of the sewing needle 54 relative to the rotating hook 3 by chain line.
- the sewing needle 54 is vertically moved inside the peripheral wall 20 along the wall 20.
- the second reinforcing rib 26 is located in the vicinity of the sewing needle 54.
- the second reinforcing rib 26 does not interfere with the sewing needle 54 since the space S is defined so that the second reinforcing rib 26 is prevented from interfering with the sewing needle 54.
- the reinforcing ribs 25 and 26 can be located on the inside of the peripheral wall 20 while the interference between the second reinforcing rib 26 and the sewing needle 54.
- the reinforcing ribs 25 and 26 on the inside of the wall 20 are subjected to tensile force when an outwardly traveling force acts on the peripheral wall 20.
- the reinforcing ribs 25 and 26 can sufficiently resist the tensile stress, whereupon the peripheral wall 20 exhibits a high reinforcing effect.
- FIG. 13 illustrates a second embodiment of the invention. Differences of the second embodiment from the first embodiment will be described. Identical or similar parts in the second embodiment are labeled by the same reference symbols as those in the first embodiment.
- the rotating hook 3A in the second embodiment includes the beak member 5 provided integrally on the hook body 4 by the injection molding, for example. More specifically, portions corresponding to the beak peripheral wall 32 and the support wall 31 are continuous integrally to the peripheral wall 20. Furthermore, the peripheral wall 20 is formed with the needle-thread passing opening 22. In this case, the reinforcing ribs 25A and 26 are provided on the inside of the peripheral wall 20 so as to be located in the vicinity of the peripheral ends defining the opening 22 respectively. As a result, the first reinforcing rib 25A is located below the beak body 33.
- the production cost of the horizontal rotary hook can be reduced since the rotating hook 3 with the beak can be made by a single injection molding. As a result, the production cost can be reduced. Additionally, the strength of each of the ends of the peripheral wall 20 defining the needle-thread passing opening 22 can be increased in the rotating hook 3 formed with the needle-thread passing opening 22 in the peripheral wall 20 while an increase in the thickness of the peripheral wall 20 is limited.
- FIGS. 14 and 15 illustrate a third embodiment of the invention. Differences of the third embodiment from the first embodiment will be described. Identical or similar parts in the third embodiment are labeled by the same reference symbols as those in the first embodiment.
- a third reinforcing rib 44 is provided on the outside of the peripheral wall 20 of the rotating hook 3B in addition to the above-described reinforcing ribs 25 and 26, as shown in FIGS. 14 and 15 .
- the third reinforcing rib 44 is formed into the shape of "F" fallen down sideways and provided integrally on the hook body 4 by the injection molding. More specifically, the third reinforcing rib 44 includes a lateral rib 45 extending forward from the fitting holder 43 a quarter turn with respect to the rotation direction A of the rotating hook 3 and a longitudinal ribs 46 and 47 both extending upward from the lateral rib 45.
- the longitudinal rib 47 formed at the forward side with respect to the rotation direction of the rotating hook 3 so as to extend substantially to an upper end of the peripheral wall 20 as shown in FIG. 15 .
- the other longitudinal rib 26 is formed so as to be shorter than the longitudinal rib 47.
- the third reinforcing rib 44 has a dimension of outward protrusion from the peripheral wall 20. The dimension of the rib 44 is set to be slightly smaller than that of the reinforcing peripheral wall 41.
- the strength of the ends of the peripheral wall can further be increased since the rotating hook 3B is provided with the third reinforcing rib 44 as well as the reinforcing ribs 25 and 26. Furthermore, the third reinforcing rib 44 can be prevented from interfering with external during rotation of the rotating hook 3 since the dimension of outward protrusion of the third reinforcing rib 44 is relatively smaller. Accordingly, since the longitudinal rib 47 can be formed so as to extend substantially to the upper end, the strength of the peripheral wall 20 can effectively be increased.
- the second reinforcing rib 26 may be eliminated with provision of the first and third reinforcing ribs 25 and 44 in the third embodiment.
- the beak member 5 may be made of a metal.
- the first reinforcing rib 25A in the second embodiment may be located at the same position as the first reinforcing rib 25 in the first embodiment.
- the reinforcing ribs 25 and 26 should not be limited to the triangular shape but may be formed into a prismatic shape with a rectangular section, a columnar shape with a circular or elliptic section or the like.
- the invention may be various types of horizontal rotary hooks such as half rotary hooks.
Description
- The disclosure relates to a horizontal rotary hook for a sewing machine which includes an inner bobbin case holder for accommodating a bobbin and an outer rotating hook for accommodating the bobbin case holder, and more particularly to such a horizontal rotary hook in which the rotating hook includes a peripheral wall having an end defining a needle-thread passing opening.
- A horizontal rotary hook providing an easy replacement of a bobbin has conventionally been used in sewing machines. The horizontal rotary hook comprises an outer rotating hook having a sliding surface and an inner bobbin case holder accommodating a thread bobbin therein and supported in the rotating hook so as to be rotatable relative to the sliding surface. The rotating hook is formed into a cylindrical container with an upper opening. The rotating hook includes a peripheral wall on which a loop seizing beak is provided for seizing a loop of needle thread and which has a needle-thread passing opening through which a needle thread seized by the beak passes. The rotating hook is rotated in a predetermined direction by a sewing machine motor.
- The bobbin case holder is made of a synthetic resin so that a reduction is achieved in the weight and production cost thereof. Furthermore, the rotating hook has also been made of a synthetic resin recently. For example,
JP-U-S60-149388 JP-A-S58-97390 - However, the peripheral wall of the rotating hook is made of a synthetic resin in the horizontal rotary hook disclosed by the former reference,
JP-U-S60-149388 JP-A-S58-97390 -
US 3,016,033 discloses a plastic rotating hook, that includes a peripheral wall with reinforcing rib and spokes on an outer wall surface of a wall, for mounting and reinforcing the connection between a loop taking hook and the wall. It further discloses a shuttle body adapted for use with an oscillatory shuttle-type sewing machine. -
US 4,660,487 discloses a loop taker, that has a loop taker body molded of resin in one piece, and a hook made of metal. A rotary shaft is fitted in the center of the loop taker, and a set screw threadedly inserted in the end of this rotary shaft holds down the loop taker. A pin fixedly installed on the rotary shaft is fitted in a radially extending groove in the loop taker, whereby the loop taker is connected to the rotary shaft so that it will not rotate relative to the rotary shaft. - The invention as claimed in
claim 1, solves the problem of how to increase the strength of the peripheral wall of the rotating hook while an increase in the size of the rotating hook is limited. - Since the reinforcing rib is formed in the vicinity of the peripheral end defining the needle-thread passing opening of the rotating hook, the strength of the end of the peripheral wall facing the opening can be increased while an increase in the thickness of the peripheral wall of the rotating hook is limited. Furthermore, the aforesaid reinforcing rib may be provided on an inner surface of the peripheral wall. As a result, an outward force applied to the peripheral wall, namely, a tensile stress applied to the reinforcing rib can sufficiently be coped with, whereupon high reinforcing effect can be achieved. Furthermore, the entire size of the horizontal rotary hook can be prevented from being increased and accordingly, the production cost can be reduced.
- In another aspect, the invention further comprises an enlarged opening formed in the peripheral wall of the rotating hook so as to be defined at least by a second peripheral end of the peripheral wall of the rotating hook and so as to be continuous to the needle-thread passing opening, a beak member separate from the rotating hook and mounted on the rotating hook so as to close the enlarged opening, and a reinforcing rib provided on the peripheral wall of the rotating hook so as to be located in the vicinity of at least one of the first peripheral end defining the needle-thread passing opening and the second peripheral end defining the enlarged opening.
- The beak member is mounted on the rotating hook so as to close the enlarged opening although the beak member is separate from the rotating hook. Accordingly, since the peripheral wall and the beak member are avoided being laid on each other, the size of the rotating hook can be prevented from being increased. Furthermore, provision of the reinforcing rib can increase the strength of the end of the peripheral wall facing the needle-thread passing opening and the enlarged opening while an increase in the thickness of the peripheral wall of the rotating hook is limited.
- Furthermore, the reinforcing rib may be formed into a generally triangular shape. Additionally, when being sized so that a gap is defined between a sewing needle and the reinforcing rib in sewing, the reinforcing rib can be prevented from interference with the sewing needle.
- Other objects, features and advantages of the present invention will become clear upon reviewing the following description of the illustrative aspects with reference to the accompanying drawings, in which:
-
FIG. 1A is a perspective view of a sewing machine according to a first illustrative aspect of the invention; -
FIG. 1B is an enlarged perspective view of a needle plate; -
FIG. 2 is a plan view of a horizontal full rotary hook; -
FIG. 3 is a plan view of an inner bobbin case holder; -
FIG. 4 is a plan view of an outer rotating hook; -
FIG. 5 is a perspective view of the rotating hook with a beak member being shown in an exploded state; -
FIG. 6 is a perspective view of the rotating hook as taken from an angle different fromFIG. 5 ; -
FIG. 7 is a view similar toFIG. 4 , showing the condition before a beak member is attached to the rotating hook; -
FIG. 8 is a view taken along line 8-8 inFIG. 7 ; -
FIG. 9 is a view taken along line 9-9 inFIG. 7 ; -
FIG. 10 is a perspective view of a beak; -
FIG. 11 is an enlarged plan view of the beak; -
FIG. 12 is a view as viewed in the direction of arrow J inFIG. 11 ; -
FIG. 13 is a view similar toFIG. 6 , showing a second illustrative aspect of the invention; -
FIG. 14 is a view similar toFIG. 4 , showing a third illustrative aspect of the invention; and -
FIG. 15 is a view similar toFIG. 5 . - Several embodiments of the invention will be described with reference to the accompanying drawings.
FIGS. 1A to 12 show a first embodiment of the invention. The invention is applied to a horizontal full rotary hook in which an outer rotating hook is continuously rotated in one direction. - Firstly, an overall construction of a sewing machine provided with the horizontal full rotary hook of the first embodiment will be described. The sewing machine comprises a
body 51 including asewing bed 52 and asewing arm 53 formed integrally with the bed so as to be mounted over the bed as shown inFIG. 1A . Thearm 53 has a distal end having aneedle bar 55 provided with asewing needle 54. Aneedle bar 55 is moved vertically by a driving mechanism (not shown). On the other hand, ametal needle plate 56 is mounted on an upper surface of thebed 52 so as to be opposed to theneedle bar 55 as shown inFIG. 1B . Theneedle plate 56 has a needle hole through which theneedle 54 passes and a plurality ofelongate slits 56b for actuation of a feed dog (not shown). Further, theneedle plate 56 has a rectangular bobbin-accommodatinghole 57 located in front of theneedle hole 56a and theelongate slits 56b. The bobbin-accommodatinghole 57 has twoslide grooves 57a formed in right and left portions thereof (only the left slide groove being shown) respectively. A transparent slide lid 58 (seeFIG. 1A ) is adapted to be inserted into thegrooves 57a so as to be slidable front and back, thereby closing and opening the bobbin-accommodatinghole 57. - A cloth feed mechanism (not shown) is provided inside the
bed 52 for driving the feed dog in synchronization with the vertical movement of theneedle bar 55. Further, a horizontal fullrotary hook 1 of the embodiment is located below the bobbin-accommodatinghole 57. The horizontal fullrotary hook 1 includes abeak member 5 and an outer rotating hook 3 (seeFIG. 2 ) horizontally rotated in synchronization with the vertical movement of theneedle bar 55 and an inner bobbin case holder 2 (seeFIG. 2 ). Abobbin 7 on which abobbin thread 59 is wound is detachably accommodated in the inner rotating hookbobbin case holder 2 as shown inFIG. 1B . Aplastic presser plate 60 is mounted on the underside of theneedle plate 56 so as to be located in the bobbin-accommodatinghole 57. Thepresser plate 60 has an opening through which thebobbin 7 is put into and taken out of thebobbin case holder 2. Thepresser plate 60 further has an engagement portion (not shown) formed on the underside thereof for engaging arotation limiter 12 of thebobbin case holder 2, which limiter 12 will be described later. - In the sewing machine thus constructed, when the
rotating hook 3 is rotated counterclockwise in synchronization with the vertical movement of theneedle bar 55, a loop of needle thread (not shown) formed by asewing needle 54 below aneye 56a of the sewing needle is caught by a loop seizingbeak member 5. This direction of rotation will hereinafter be referred to as "hook rotating direction A." The thread loop is then entangled with thebobbin thread 59 while being passed outside thebobbin case holder 2, whereby a stitch is formed. - The horizontal full
rotary hook 1 will now be described in detail with reference toFIGS. 2 to 12 . Thebobbin case holder 2 will first be described. Referring toFIGS. 2 and 3 , thebobbin case holder 2 is made of a synthetic resin such as nylon resin and formed into the shape of a substantially cylindrical shallow container. An interior of thebobbin case holder 2 serves as a bobbin-accommodatingsection 11 for accommodating thebobbin 7. Thebobbin case holder 2 has a bottom with a centrally formedshaft 8 with which thebobbin 7 is to be fitted. - Referring to
FIG. 3 , thebobbin case holder 2 includes an outer periphery formed with therotation limiter 12 located at the front as viewed inFIG. 3 and preventing rotation of thebobbin case holder 2. The outer periphery of thebobbin case holder 2 is further formed with anotch 10 located at an inner side as viewed inFIG. 3 and allowing theneedle 54 to pass through the notch. Thenotch 10 has one end formed with a protrudingthread guide 13. Further, the bobbin-accommodatingsection 11 has an inner wall provided with a tensioning member (not shown) for tensioning abobbin thread 59. The tensioning member comprises a thread tension bracket and a tension spring both of which are formed into an arc-shaped plate and mounted on the inner wall of the bobbin-accommodatingsection 11 in a superposed state. - Next, the
rotating hook 3 will be described. Referring toFIGS. 5 and6 , therotating hook 3 includes a cylindrical receptacle-shapedhook body 4 having an open top, abeak member 5 to be mounted on thehook body 4 and adrive shaft 6 extending downward from the central underside of thehook body 4. In the embodiment, thehook body 4 and thedrive shaft 6 are each made of a synthetic resin such as nylon resin and are formed integrally with each other, for example, by injection molding. Thebeak member 5 is made of a synthetic resin such as polyimide resin. The material of thebeak member 5 has a higher hardness than the material of thehook body 4. Thus, since thebeak member 5 is made of the synthetic resin, thebeak member 5 can easily be made as a formed part, and the production cost of thebeak member 5 can be reduced as compared with a beak member made of a metal. - Referring now to
FIGS. 4 to 7 , thehook body 4 has a disc-shapedbottom 21 and aperipheral wall 20 which is formed integrally with the bottom so as to rise from an outer circumference of the bottom. Thehook body 4 has a slightly larger diameter than thebobbin case holder 2. Theperipheral wall 20 includes a part formed into a needle-thread passing opening 22 through which a needle thread seized by thebeak member 5 passes, as shown inFIGS. 5 to 7 . Thewall 20 is further formed with an enlarged opening 23 (seeFIG. 5 ) which is continuous to the side of theopening 22 opposed to the rotation direction A of the rotating hook and into which thebeak member 5 is attached. Furthermore, theperipheral wall 20 has an upper end formed with an annular slidingsurface 24 which is located at the inner peripheral side and is lower by one step than the top except for theopenings bobbin case holder 2 has a lower end placed on the slidingsurface 24 so as to be slidable thereon as shown inFIGS. 2 and12 , whereupon thebobbin case holder 2 is adapted to be accommodated in therotating hook 3 while floating slightly away from the bottom 21. Dashed line K inFIGS. 10 and 11 designates a movement locus of the lower end of the outer periphery of thebobbin case holder 2 sliding on the slidingsurface 24. - Referring now to
FIGS. 5 and6 , thedrive shaft 6 is formed into the shape of a pipe and has ashaft hole 6a (SeeFIG. 5 ) vertically extending therethrough. Thedrive shaft 6 further has a worm-gear-like gear formed on the outer circumference thereof. A rotating hook shaft (not shown) is adapted to be inserted through theshaft hole 6a. The rotating hook shaft has a lower end fixed to a sewing machine frame (the bottom of the bed 52), thereby rotatably supporting therotating hook 3. The gear of thedrive shaft 6 is brought into mesh engagement with a driving gear of a hook driving mechanism (not shown) so that therotating hook 3 is rotated via the aforesaid driving gear and driveshaft 6 in the hook rotating direction A. - The
beak member 5 is a component separate from thehook body 4 and is detachably attached to thehook body 4 in the embodiment. A mounting structure for thebeak member 5 will be described in detail. The construction of thebeak member 5 will firstly be described. Thebeak member 5 has a height equal to that of the outercircumferential wall 20 and is formed into the shape of a plate curved at the same curvature as thewall 20 as viewed from above, as shown inFIGS. 5 and10 to 12. Thebeak member 5 is sized so as to close the aforesaidenlarged opening 23. Thebeak member 5 has substantially a lower half serving as asupport wall 31 and an upper half serving as a beakperipheral wall 32 located at the outer periphery side of thelace 24. - The beak
peripheral wall 32 has an upper face including a forward side with respect to a rotation direction A of the rotating hook as shown inFIG. 12 . Aguide face 32d is formed on the forward side of the upper face of the beakperipheral wall 32. The beakperipheral wall 32 further has a rearward side upper end formed with an outwardly protrudingthread engagement step 32c as shown inFIG. 5 . Thethread engagement step 32c is provided for engaging and locking the needle thread loop. - The beak
peripheral wall 32 also has an inner periphery including a horizontal thin plate-shapedbeak body 33 formed integrally with thewall 32 so as to be located near to the lower side of the lace 24 (the side lower than the chain line K) as shown inFIGS. 4 ,6 and10 to 12 . Thebeak body 33 has a forward side end with respect to the rotation direction A of the rotating hook. The forward side end of thebeak body 33 is formed so as to extend toward the forward side by a predetermined dimension and so as to protrude inward. The beakperipheral wall 32 andbeak body 33 constitute the thread capturing beak. Furthermore, two positioningpins 37 extend downward from the underside of thesupport wall 31 of thebeak member 5 as shown inFIGS. 5 and12 . - A fixing
block 34 is integrally formed on the inner periphery of thesupport wall 31 as shown inFIG. 10 . The fixingblock 34 includes a bottom 36 mounted on the lower end of thesupport wall 31 and a pair of substantiallytriangular side walls 35 extending from opposite ends of the bottom 36. The bottom 36 is formed into a rectangular shape and has a centrally located fixingscrew hole 36a. - On the other hand, the
hook body 4 is provided with afitting holder 43 for holding thebeak member 5. Thefitting holder 43 includes a reinforcingperipheral wall 41 protruding outward from theperipheral wall 20 of thehook body 4 and supporting a lower outer face of thebeak member 5 as shown inFIGS. 7 and8 . Thefitting holder 43 further includes a reinforcing bottom 40 which is continuous to the bottom 21 and constitutes the bottom of thefitting holder 43. Furthermore, the reinforcingperipheral wall 41 has an end having an inner reinforcingwall 42 which is formed adjacent to the inner face of thebeak member 5 so as to be parallel with the reinforcingperipheral wall 41. Each of theperipheral walls peripheral wall 20, for example. The reinforcingperipheral wall 41 has both ends continuous to theperipheral wall 20. Furthermore, the reinforcingperipheral wall 41 has a corner located at the forward side with respect to the rotation direction A of the rotating hook as shown only inFIG. 7 . Acolumnar corner support 41a is formed on the corner so as to be located at the reinforcing bottom 40 side. Thus, thecorner support 41a, reinforcingperipheral wall 41 and inner reinforcingwall 42 are abutted against the upwardly insertedbeak member 5, thereby holding thebeak member 5 in a vertical position. - On the other hand, the reinforcing bottom 40 continuous to the bottom 21 is formed into a generally T-shape as viewed on a plane so as to be located slightly lower than the bottom 21. The reinforcing
bottom 40 has ascrew hole 40a formed an inner part thereof so that thescrew hole 40a corresponds to thescrew hole 36a of the fixingblock 34 of thebeak member 5. The reinforcing bottom 40 further has acircular pin hole 40b for positioning thebeak member 5 and an elongatecircular pin hole 40c which is slightly longer laterally than thepin hole 40b. Accordingly, even if the distance between the positioning pins 37 has a dimensional error, the error can be absorbed by theelongate pin hole 40c. Consequently, thebeak member 5 can be mounted on therotating hook 3 reliably and accurately. - The
beak member 5 is fitted into afitting holder 43 provided on thehook body 4 from above thereby to be mounted on thehook body 4, as shown inFIG. 5 . In this case, the twopositioning pins 37 formed on the lower end of thebeak member 5 are inserted into the pin holes 40b and 40c formed in the reinforcing bottom 40 respectively while thebeak member 5 is guided by a reinforcingperipheral wall 41 and an inner reinforcingwall 42, whereby thebeak member 5 is fitted in thefitting holder 43. Consequently, thebeak member 5 can easily be positioned. - The fixing
screw 38 is inserted through thescrew hole 40a from below and screwed into thescrew hole 36a of the fixing block 34 (seeFIG. 5 ), whereby thebeak member 5 is adapted to be fixed to therotating hook 3. Consequently, thebeak member 5 can be fixed stably and mounted reliably. Furthermore, since the twopositioning pins 37 are engaged with the pin holes 40b and 40v respectively, the strength of therotating hook 3 can be increased so as to resist an instantaneous external stress even when thread entanglement or the like subjects thebeak member 5 to the instantaneous external stress outwardly traveling. Moreover, in this case, thecorner support 41a, the reinforcingperipheral wall 41 and the inner reinforcingwall 42 are abutted against thebeak member 5, thereby holding thebeak member 5 in a vertical position. Consequently, since thebeak member 5 is reinforced by the aforesaid abutment, the strength to overcome the above-described external stress can be ensured. - Furthermore, since the
beak member 5 is mounted on thehook body 4 so as to close theenlarged opening 23, the thickness of theperipheral wall 20 need not be increased. Accordingly, thebeak member 5 can be constituted as a member separate from thehook body 4 while an increase in the size of therotating hook 3 is limited. Additionally, since thebeak member 5 can be replaced individually, a replacing work can be simplified and accordingly, the maintenance cost can be reduced. - A plurality of
inclined surfaces beak member 5 and theperipheral wall 20 of thehook body 4 in the injection molding in the embodiment. More specifically, as shown inFIG. 11 , the firstinclined face 32a is formed on a forward end of the beakperipheral wall 32 with respect to the rotation direction A of therotating hook 3. The firstinclined face 32a is inclined forwardly outward. Furthermore, the secondinclined face 33a is formed on a forward end of thebeak body 33 with respect to the rotation direction A of therotating hook 3 as shown inFIG. 11 . The secondinclined face 33a is inclined forwardly downward. - On the other hand, the third
inclined face 20a is formed on an inner peripheral edge of theperipheral wall 20 fronting to theenlarged opening 23 and thebeak member 5 as shown inFIGS. 6 and11 . The thirdinclined face 20a is gently inclined forwardly outward. Furthermore, as shown inFIG. 12 , the fourthinclined face 20b is formed on a forward edge of thelace 24. The fourthinclined face 20b is inclined forwardly downward. Thebobbin case holder 2 can smoothly be slid on the slidingsurface 24 without collision against thebeak member 5 and the peripheral end as the result of formation of theinclined surfaces - The
rotating hook 3 is formed with first and second reinforcingribs peripheral wall 20 of thehook body 4 and extending longitudinally as shown inFIG. 11 . Each rib interconnects outer peripheries of theperipheral wall 20 and the bottom 21 and comes closer to theperipheral wall 20 as a height thereof is increased. Thus, each of the reinforcingribs peripheral wall 20 and an outer periphery of the bottom 21 of therotating hook 3 and a sectional area of each reinforcing rib is rendered smaller as a height of each reinforcing rib is increased. Each reinforcing rib is formed integrally with thehook body 4 by injection molding, for example. The reinforcingribs thread passing opening 22 and theenlarged opening 23 are located between theribs rib 25 is located in the vicinity of the peripheral end of theperipheral wall 20 defining theenlarged opening 23 whereas the second reinforcingrib 26 is located in the vicinity of the peripheral end of the needle-thread passing opening 22. The second reinforcingrib 26 is sized so that a predetermined space S is defined between thesewing needle 54 and therib 26. The second reinforcingrib 2 6 has a dimension L of inward protrusion which is set so that therib 26 is prevented from contact with theneedle 54. - An operation and effect of the horizontal full
rotary hook 1 constructed above will now be described. In the embodiment, the first reinforcingrib 25 is provided integrally on the end of theperipheral wall 20 of thehook body 4 facing theenlarged opening 23, and the second reinforcingrib 26 is provided integrally on the end of theperipheral wall 20 facing the needle-thread passing opening 22. Consequently, the strength of each of the ends facing theopenings peripheral wall 20 of thehook body 4 can be increased without an increase in the thickness of each end. - According to the horizontal full
rotary hook 1 of the embodiment, in the construction that the rotating hook 3 (hook body 4) is made of the synthetic resin, the strength of theperipheral wall 20 of thehook body 4 can be improved while the size of therotating hook 3 is prevented from being increased and accordingly, occurrence of deformation or breakage can be prevented even when theperipheral wall 20 is subjected to an external force. -
FIGS. 4 and6 show a movement locus of thesewing needle 54 relative to therotating hook 3 by chain line. As shown in the figures, thesewing needle 54 is vertically moved inside theperipheral wall 20 along thewall 20. When theneedle 54 drops to the lowermost point, the second reinforcingrib 26 is located in the vicinity of thesewing needle 54. However, the second reinforcingrib 26 does not interfere with thesewing needle 54 since the space S is defined so that the second reinforcingrib 26 is prevented from interfering with thesewing needle 54. Thus, the reinforcingribs peripheral wall 20 while the interference between the second reinforcingrib 26 and thesewing needle 54. Consequently, the reinforcingribs wall 20 are subjected to tensile force when an outwardly traveling force acts on theperipheral wall 20. However, the reinforcingribs peripheral wall 20 exhibits a high reinforcing effect. -
FIG. 13 illustrates a second embodiment of the invention. Differences of the second embodiment from the first embodiment will be described. Identical or similar parts in the second embodiment are labeled by the same reference symbols as those in the first embodiment. - The
rotating hook 3A in the second embodiment includes thebeak member 5 provided integrally on thehook body 4 by the injection molding, for example. More specifically, portions corresponding to the beakperipheral wall 32 and thesupport wall 31 are continuous integrally to theperipheral wall 20. Furthermore, theperipheral wall 20 is formed with the needle-thread passing opening 22. In this case, the reinforcingribs peripheral wall 20 so as to be located in the vicinity of the peripheral ends defining theopening 22 respectively. As a result, the first reinforcingrib 25A is located below thebeak body 33. - According to the embodiment, the production cost of the horizontal rotary hook can be reduced since the
rotating hook 3 with the beak can be made by a single injection molding. As a result, the production cost can be reduced. Additionally, the strength of each of the ends of theperipheral wall 20 defining the needle-thread passing opening 22 can be increased in therotating hook 3 formed with the needle-thread passing opening 22 in theperipheral wall 20 while an increase in the thickness of theperipheral wall 20 is limited. -
FIGS. 14 and 15 illustrate a third embodiment of the invention. Differences of the third embodiment from the first embodiment will be described. Identical or similar parts in the third embodiment are labeled by the same reference symbols as those in the first embodiment. - In the third embodiment, a third reinforcing
rib 44 is provided on the outside of theperipheral wall 20 of therotating hook 3B in addition to the above-described reinforcingribs FIGS. 14 and 15 . The third reinforcingrib 44 is formed into the shape of "F" fallen down sideways and provided integrally on thehook body 4 by the injection molding. More specifically, the third reinforcingrib 44 includes alateral rib 45 extending forward from the fitting holder 43 a quarter turn with respect to the rotation direction A of therotating hook 3 and alongitudinal ribs lateral rib 45. Thelongitudinal rib 47 formed at the forward side with respect to the rotation direction of therotating hook 3 so as to extend substantially to an upper end of theperipheral wall 20 as shown inFIG. 15 . The otherlongitudinal rib 26 is formed so as to be shorter than thelongitudinal rib 47. Furthermore, the third reinforcingrib 44 has a dimension of outward protrusion from theperipheral wall 20. The dimension of therib 44 is set to be slightly smaller than that of the reinforcingperipheral wall 41. - According to the third embodiment, the strength of the ends of the peripheral wall can further be increased since the
rotating hook 3B is provided with the third reinforcingrib 44 as well as the reinforcingribs rib 44 can be prevented from interfering with external during rotation of therotating hook 3 since the dimension of outward protrusion of the third reinforcingrib 44 is relatively smaller. Accordingly, since thelongitudinal rib 47 can be formed so as to extend substantially to the upper end, the strength of theperipheral wall 20 can effectively be increased. - Modified forms of the foregoing embodiments will now be described. The second reinforcing
rib 26 may be eliminated with provision of the first and third reinforcingribs beak member 5 may be made of a metal. The first reinforcingrib 25A in the second embodiment may be located at the same position as the first reinforcingrib 25 in the first embodiment. Additionally, the reinforcingribs - The invention may be various types of horizontal rotary hooks such as half rotary hooks.
- The foregoing description and drawings are merely illustrative of the principles of the present invention and are not to be construed in a limiting sense. Various changes and modifications will become apparent to those of ordinary skill in the art. All such changes and modifications are seen to fall within the scope of the invention as defined by the appended claims.
Claims (5)
- A horizontal rotary hook (1) for a sewing machine, comprising:a bobbin case holder (2) accommodating a bobbin (7);a rotating hook (3) made of a synthetic resin, and accommodating the bobbin case holder (2) and rotated in a predetermined direction, the rotating hook (3) including a peripheral wall (20) and a first peripheral end;a needle-thread passing opening (22) formed in the peripheral wall (20) of the rotating hook (3) so as to be defined at least by the first peripheral end of the peripheral wall (20); anda reinforcing rib (26) provided on the peripheral wall (20) of the rotating hook (3) so as to be located in the vicinity of the first peripheral end defining the needle-thread passing opening (22);characterized bythe reinforcing rib (26) being provided on an inner surface of the peripheral wall (20) and interconnecting the peripheral wall (20) and an outer periphery of the bottom (21) of the rotating hook (3).
- The horizontal rotary hook (1) claimed in claim 1, comprising:an enlarged opening (23) formed in the peripheral wall (20) of the rotating hook (3) so as to be defined at least by a second peripheral end of the peripheral wall (20) of the rotating hook (3) and so as to be continuous to the needle-thread passing opening (22);a beak member (5) separate from the rotating hook (3) and mounted on the rotating hook (3) so as to close the enlarged opening (23); andthe reinforcing rib (26, 25) provided on the peripheral wall (20) of the rotating hook (3) so as to be located in the vicinity of the first peripheral end defining the needle-thread passing opening (22) and/or the second peripheral end defining the enlarged opening (23).
- The horizontal rotary hook (1) according to claim 1 or 2, wherein the rotating hook (3) includes a bottom (21), and the reinforcing rib (25, 26) is formed into such a generally triangular shape that the reinforcing rib (25, 26) interconnects the peripheral wall (20) and an outer periphery of the bottom (21) of the rotating hook (3) and a sectional area of the reinforcing rib (25, 26) is rendered smaller as a height of the reinforcing rib (25, 26)is increased.
- The horizontal rotary hook (1) according to claim 1 or 2, wherein the reinforcing rib (25, 26) is sized so that a gap is defined between a sewing needle (54) and the reinforcing rib (25, 26) in sewing.
- The horizontal rotary hook (1) according to claim 2, wherein the beak member (5) is made of a synthetic resin.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004338540A JP4508844B2 (en) | 2004-11-24 | 2004-11-24 | Horizontal rotary hook |
US11/284,165 US7389734B2 (en) | 2004-11-24 | 2005-11-21 | Horizontal rotary hook for sewing machine |
PCT/US2005/042851 WO2006058269A1 (en) | 2004-11-24 | 2005-11-23 | Horizontal rotary hook for sewing machine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1828466A1 EP1828466A1 (en) | 2007-09-05 |
EP1828466B1 true EP1828466B1 (en) | 2010-04-14 |
Family
ID=35929631
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05825726A Not-in-force EP1828466B1 (en) | 2004-11-24 | 2005-11-23 | Horizontal rotary hook for sewing machine |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1828466B1 (en) |
KR (1) | KR20070086550A (en) |
CA (1) | CA2585445A1 (en) |
WO (1) | WO2006058269A1 (en) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3016033A (en) * | 1958-01-09 | 1962-01-09 | Singer Mfg Co | Shuttle mechanisms for sewing machines |
US3223060A (en) * | 1961-01-18 | 1965-12-14 | Wall J | Two-part looptakers |
JPS60149388U (en) * | 1984-03-14 | 1985-10-03 | ジャガー株式会社 | sewing machine pot |
US4966088A (en) * | 1987-03-13 | 1990-10-30 | Bakron Corp. | Composite rotary loop taker for lock-stitch sewing machine |
JPH0731775A (en) * | 1993-07-20 | 1995-02-03 | Brother Ind Ltd | Horizontal full rotary shuttle |
-
2005
- 2005-11-23 WO PCT/US2005/042851 patent/WO2006058269A1/en active Application Filing
- 2005-11-23 KR KR1020077014208A patent/KR20070086550A/en not_active Application Discontinuation
- 2005-11-23 CA CA002585445A patent/CA2585445A1/en not_active Abandoned
- 2005-11-23 EP EP05825726A patent/EP1828466B1/en not_active Not-in-force
Also Published As
Publication number | Publication date |
---|---|
KR20070086550A (en) | 2007-08-27 |
CA2585445A1 (en) | 2006-06-01 |
WO2006058269A1 (en) | 2006-06-01 |
EP1828466A1 (en) | 2007-09-05 |
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