EP3257992B1 - Vertical full rotation shuttle - Google Patents
Vertical full rotation shuttle Download PDFInfo
- Publication number
- EP3257992B1 EP3257992B1 EP15881996.1A EP15881996A EP3257992B1 EP 3257992 B1 EP3257992 B1 EP 3257992B1 EP 15881996 A EP15881996 A EP 15881996A EP 3257992 B1 EP3257992 B1 EP 3257992B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shuttle
- rotation
- engaging
- bobbin case
- engaging recess
- 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.)
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- 230000002093 peripheral effect Effects 0.000 claims description 37
- 238000009958 sewing Methods 0.000 claims description 25
- 238000011144 upstream manufacturing Methods 0.000 claims description 11
- 230000000717 retained effect Effects 0.000 claims description 5
- 238000004804 winding Methods 0.000 claims description 2
- 238000003780 insertion Methods 0.000 description 7
- 230000037431 insertion Effects 0.000 description 7
- 229910000639 Spring steel Inorganic materials 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B57/00—Loop takers, e.g. loopers
- D05B57/08—Loop takers, e.g. loopers for lock-stitch sewing machines
- D05B57/10—Shuttles
- D05B57/14—Shuttles with rotary hooks
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B57/00—Loop takers, e.g. loopers
- D05B57/28—Applications of bobbins for storing the lower thread
Definitions
- the present invention relates to a vertical full rotation shuttle provided on a sewing machine.
- a vertical full rotation shuttle of the related art is described in, for example, Patent Literature 1.
- the vertical full rotation shuttle of the related art includes an outer shuttle fixed to a lower shaft of the sewing machine and having a hook portion, an inner shuttle retained in a state of being accommodated in the outer shuttle, a bobbin case removably mounted in the inner shuttle, and a bobbin around which a lower thread is to be wound and configured to be accommodated in the bobbin case.
- the lower shaft When a sewing action of the sewing machine is started, the lower shaft is rotated in a predetermined direction of rotation about a horizontal axis of rotation, and a sewing needle repeats an action of moving toward and away from the axis of rotation along an axial line perpendicular to the axis of rotation of the lower shaft.
- a needle thread inserted through the sewing needle is caught by a hook portion and forms a needle thread loop.
- the needle thread loop moves along a surface of the inner shuttle and passes over the lower thread, which causes the needle thread to engage with the lower thread drawn out from the inner shuttle through a needle hole in a needle plate over a sewing machine head, and stitches are formed on an object to be sewed.
- the inner shuttle includes a substantially cylindrical peripheral wall part, a bridge part that extends in one diameter direction so as to be connected to one end of the peripheral wall part in an axial direction thereof to form a bottom portion, a stud provided on the bridge part so as to extend upright toward the other end of the peripheral wall part in the axial direction, an outwardly extending flange that extends radially outward so as to be connected to the other end of the peripheral wall part in the axial direction, and a substantially C-shaped track projection that projects from an outer peripheral surface of the peripheral wall part and extends in a circumferential direction.
- the peripheral wall part is provided with a needle location hole in which the sewing needle is inserted, and the inner shuttle is restricted from rotating by a retaining member which is connected to a proximal end thereof to a body of a sewing machine so that the needle location hole is always aligned with an axial line of the sewing needle and is prevented from rotating following the outer shuttle.
- the bobbin case includes a cylindrical peripheral wall part that is fitted into the inner shuttle; an end wall portion provided so as to close an opening on one end side of the peripheral wall part; an engaging strip retained on the end wall portion so as to be movable in a direction of a diameter perpendicular to an axial line of the peripheral wall part, and also referred to as a latch; a latch spring that resiliently biases the engaging strip in one direction; and an operating lever that moves the engaging strip in the other direction against a spring force of the latch spring.
- the engaging strip includes a strip-shaped base portion; and an engaging portion that is connected at substantially a right angle to one end in a longitudinal direction of the base portion, and the engaging strip is resiliently biased in the one direction by the latch spring in a direction of causing the engaging portion to project in a state in which the engaging portion protrudes from the peripheral wall part.
- the latch spring is formed of a compression coil spring, and is accommodated in a spring accommodating hole provided in the end wall portion in parallel to the longitudinal direction of the engaging strip.
- the inner shuttle includes a peripheral wall part into which the peripheral wall part of the bobbin case can be approximately closely fitted; and a flange part that is connected to one end portion of the peripheral wall part on an opening end side, and the peripheral wall part and the flange part are provided with an engaging recess that extends across the peripheral wall part and the flange part so as to allow engagement of the above-described engaging portion.
- the engaging portion of the bobbin case fits into and engages with the engaging recess of the inner shuttle and the bobbin case is restricted from rotating with respect to the inner shuttle about an axial line of the inner shuttle.
- the EP 0 507 558 B1 and the JP H10 216382 A disclose a vertical full rotation shuttle having an outer shuttle fixed to a lower shaft, an inner shuttle retained by the outer shuttle so as to rotate about the axis of rotation, a bobbin case removably mounted in the inner shuttle, the bobbin case having an engaging strip that removably engages with an engaging recess with a clearance in the direction of rotation, and a bobbin accommodated in the bobbin case, wherein a member is supported in the engaging recess and disposed in the clearance in a state in which the engaging strip engages with the engaging recess.
- Patent Literature 1 JP-Y2 61-14375(1986)
- a clearance having a tolerance within a range of approximately 0.1 to 0.3 mm is provided between the engaging portion and the engaging recess in the direction of rotation thereof about the axial line of the inner shuttle. Therefore, there arises a problem of occurrence of vibrations in the bobbin case with respect to the inner shuttle mainly in the direction of rotation during a sewing operation, which may cause thread breakage or incidental looping due to changes in tension of an upper thread and a lower thread.
- An object of the invention is to provide a vertical full rotation shuttle that is capable of preventing occurrence of thread breakage and incidental looping.
- the invention provides a vertical full rotation shuttle including:
- the vertical full rotation shuttle according to the invention is characterized in that the engaging strip includes an engaging portion that fits into and engages with the engaging recess and a base portion that has a long plate shape and is connected to the engaging portion in a state in which the bobbin case is mounted in the inner shuttle, and is formed into a substantially L-shape, in that the flange part is provided with the spring member that resiliently biases the engaging portion from an upstream side in the direction of rotation toward the downstream side in the direction of rotation by a spring force thereof in a state in which the engaging portion engages with the engaging recess, and in that the spring member is a leaf spring which is fixed to the flange part on the upstream side of the direction of rotation with respect to the engaging recess.
- the leaf spring includes a mounting portion that has a long plate shape and is fixed to the flange part on the upstream side of the direction of rotation with respect to the engaging recess; and a projection extending from one end in a longitudinal direction of the mounting portion into the clearance and projecting toward the downstream side in the direction of rotation.
- the engaging strip is resiliently biased by the spring member toward the downstream side in the direction of rotation in the state in which the bobbin case is mounted in the inner shuttle. Therefore, vibrations of the bobbin case with respect to the inner shuttle are restricted, and thus occurrence of thread breakage and incidental looping in association with changes in tension of the upper thread and the lower thread may be prevented.
- FIG. 1 is a front view of a vertical full rotation shuttle 1 according to an embodiment of the invention
- FIG. 2 is a cross-sectional view of the vertical full rotation shuttle 1 taken along the line II-II in FIG. 1
- FIG. 3 is a front view of an inner shuttle 3
- FIG. 4 is a front view of the inner shuttle 3 in which a bobbin case 5 having a bobbin 4 accommodated therein is mounted.
- FIG. 5 is a cross-sectional view taken along the line V-V in FIG. 3
- FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. 4 .
- the vertical full rotation shuttle 1 of the invention includes an outer shuttle 2, the inner shuttle 3, a bobbin 4, and a bobbin case 5.
- the outer shuttle 2 is fixed to a lower shaft 8 that is rotated in a direction indicated by an arrow A about an axis of rotation L2, which is perpendicular to an axial line L1 of a needle bar 7 on which a sewing needle 6 is detachably coaxially mounted.
- the outer shuttle 2 includes a tapered hook portion 9 having a distal end facing the downstream side in the direction of rotation A of the lower shaft 8.
- the inner shuttle 3 is fitted into the outer shuttle 2, and a projection of a retaining member, which is not illustrated, fits into a recess 10 to restrict the inner shuttle 3 from rotating.
- the inner shuttle 3 includes a cylindrical peripheral wall part 12 provided with a needle location hole through which the sewing needle 6 is inserted; a bottom portion 13 which is connected to other end portion of the peripheral wall part 12 in an axial direction thereof, extends in a direction of a diameter, and is also referred to as a bridge; a stud 14 provided perpendicularly upright from a center of the bottom portion 13 toward one end portion of the peripheral wall part 12 in the axial direction thereof; a flange part 15 which is connected to the one end portion of the peripheral wall part 12 in the axial direction thereof and is formed so as to extend radially outward; and a track projection 16 formed on the peripheral wall part 12 so as to project from an outer peripheral surface thereof.
- the inner shuttle 3 is provided with an engaging recess 28 so as to extend across the peripheral wall part and the flange part 15.
- the outer shuttle 2 and the inner shuttle 3 are formed, for example, of carburized carbon steel, and are provided with a hardness of 650 HV or more by thermal treatment.
- the bobbin 4 and the bobbin case 5 are formed of iron steel or stainless steel.
- the flange part 15 is provided with the needle location hole described above formed behind the recess 10, that is, on one end side of the peripheral wall part 12 in the axial direction thereof, and a lower thread guiding groove 35 that opens toward a fitting space which is defined by the recess 10 and to which the projection of the retaining member described above, which is not illustrated, fits from the downstream side in the direction of rotation A.
- the lower thread guiding groove 35 allows insertion of a lower thread 21 drawn out from between a peripheral wall part of the bobbin case 5 and a thread tensioning spring 33 provided on the peripheral wall part, so that the lower thread 21 passing through a needle hole of a needle plate provided on a sewing machine head in a tensed manner is maintained in a state of being fitted in the lower thread guiding groove 35 and prevented from being protruded outside the recess 10 even though the lower thread 21 is loosened by a thread cutting action of a thread cutter, not illustrated, while leaving the recess 10 and coming apart completely at the time of passing over.
- the bobbin case 5 is removably mounted in the inner shuttle 3, and the bobbin 4 having the lower thread 21, which is referred to as a bobbin thread, wound therearound is accommodated in the bobbin case 5.
- the bobbin case 5 is provided with a first notch 22 that allows downward movement of the sewing needle 6.
- the first notch 22 is formed in the peripheral wall part of the bobbin case 5 so as to extend in the axial direction and continues to a second notch 23.
- the bobbin case 5 is provided with a latch mechanism 25 that disengageably engages with the inner shuttle 3.
- the inner peripheral portion 17 of the inner shuttle 3 is provided with a pair of projections 24.
- the projections 24 come into contact with an inner surface of the peripheral wall part of the bobbin case 5 that opposes via the second notch 23. In this configuration, when mounting the bobbin case 5 in the inner shuttle 3, insertion of the bobbin case 5 into the inner shuttle 3 is guided, and relative angular displacement between the bobbin case 5 and the inner shuttle 3 is restricted in cooperation with the latch mechanism 25.
- the latch mechanism 25 includes an operating lever 26 and an engaging strip 27, restricts the angular displacement between the inner shuttle 3 and the bobbin case 5 by the engaging strip 27 engaging with the engaging recess 28 formed on the inner shuttle 3, and locks the bobbin case 5 with respect to the inner shuttle 3 and prevents the same from coming out therefrom.
- the latch mechanism 25 can release the bobbin case 5 from the inner shuttle 3.
- the engaging strip 27 includes an engaging portion 27a that fits into and engages with the engaging recess 28 and a base portion 27b that has a long plate shape and is connected to the engaging portion 27a in a state in which the bobbin case 5 is mounted in the inner shuttle 3, and is formed into a substantially L-shape.
- the engaging portion 27a engages with the engaging recess 28 with a clearance in the direction of rotation.
- the flange part 15 is provided with a spring member 50 that resiliently biases the engaging portion 27a from an upstream side in the direction of rotation A toward the downstream side in the direction of rotation A by a spring force thereof in a state in which the engaging portion 27a engages with the engaging recess 28.
- the above-described spring member 50 is disposed in the clearance described above.
- FIG. 7 is an enlarged cross-sectional view of a portion near the spring member 50
- FIG. 8 is a side view of the inner shuttle 3
- FIG. 9 is a side view of the inner shuttle 3 in which the bobbin case 5 is mounted.
- FIG. 10 is a back view of the inner shuttle 3
- FIG. 11 is a back view of the inner shuttle 3 in which the bobbin case 5 is mounted.
- the spring member 50 includes a mounting portion 51 that has a long plate shape and is fixed to the upstream side in the direction of rotation A with respect to the engaging recess 28 of the flange part 15, and a projecting portion 52 that is bent from an end of the mounting portion 51 in the longitudinal direction at a substantially right angle, extends inward of the engaging recess 28, and is bent to form a projection projecting toward the downstream side (upward in FIG. 7 ) in the direction of rotation A.
- the spring member 50 is a leaf spring formed of a spring steel plate having a thickness on the order of 0.15 mm, for example.
- the mounting portion 51 may be fixed to the flange part 15 by providing the flange part 15 with a mounting groove 53 extending in a direction of tangent line which is perpendicular to the axial line parallel to the longitudinal direction of the mounting portion 51 on an imaginary plane perpendicular to the axial line L2 of the lower shaft 8, and performing a swaging process in which both side portions 54a and 54b are swaged in directions close to each other in a state in which the mounting portion 51 is fitted into the mounting groove 53 so as to cause the mounting portion 51 to be tightly interposed between the side portions 54a and 54b.
- the projecting portion 52 includes a first portion 56 that inclines toward the downstream side in the direction of rotation A when viewing in a direction of insertion of the engaging portion 27a into the engaging recess 28 (rightward in FIG. 7 ) and a second portion 58 that extends via a peak portion 57 located on the downstream most side in the direction of rotation A and inclines toward the upstream side of the direction of rotation A toward the direction of insertion.
- the engaging portion 27a engages with the engaging recess 28, and the peak portion 57 of the spring member 50 resiliently abuts on the engaging portion 27a and is pressed by a constant pressing force from the upstream side in the direction of rotation. Accordingly, vibrations of the bobbin case 5 with respect to the inner shuttle 3 are restricted during a sewing operation, it is possible to prevent changes in tension of the upper thread and the lower thread in association with the vibrations and occurrence of thread breakage and incidental looping.
- FIG. 12 is an enlarged cross-sectional view illustrating a portion near a spring member 50a of the inner shuttle 3 provided on a vertical full rotation shuttle 1a according to another embodiment of the invention
- FIG. 13 is an enlarged cross-sectional view of a portion near the spring member 50a of the inner shuttle 3 in which the bobbin case 5 is mounted. Portions corresponding to the above-described embodiment are denoted by the same reference numerals and overlapped description will be omitted.
- the vertical full rotation shuttle 1a of this embodiment includes the outer shuttle 2, the inner shuttle 3, the bobbin 4, the bobbin case 5, and the spring member 50a.
- the spring member 50a includes a mounting portion 61, a first portion 62 that has a substantially semi-cylindrical shape and is connected to the mounting portion 61 at one end portion in the longitudinal direction, and a second portion 63 that is connected to the first portion 62 and is inclined toward the upstream side in the direction of rotation A when viewing in the direction of insertion (rightward in FIG. 12 ) of the bobbin case 5.
- the spring member 50a is a leaf spring formed of a spring steel plate having a thickness on the order of 0.15 mm, for example.
- the mounting portion 61 is fixed to the flange part 15 in the groove 53 by a rivet 64.
- the spring member 50a as described above presses the engaging portion 27a by the second portion 63 on the downstream side in the direction of rotation A, and also in the direction of insertion of the bobbin case 5. Therefore, rattling and vibrations of the bobbin case 5 about the axial line L2 may be suppressed, and rattling and vibrations of the same in the direction of the axial line L2 may also be suppressed. Accordingly, it is possible to prevent occurrence of thread breakage and incidental looping more certainly.
- FIG. 14 is an enlarged cross-sectional view illustrating a portion near a spring member 50b of the inner shuttle 3 provided on a vertical full rotation shuttle 1b according to still another embodiment of the invention
- FIG. 15 is an enlarged cross-sectional view of a portion near the spring member 50b of the inner shuttle 3 in which the bobbin case 5 is mounted. Portions corresponding to the above-described embodiments are denoted by the same reference numerals and overlapped description will be omitted.
- the vertical full rotation shuttle 1b of this embodiment includes the outer shuttle 2, the inner shuttle 3, the bobbin 4, the bobbin case 5, and the spring member 50b.
- the spring member 50b includes a mounting portion 71; a first portion 72 that is bent at an angle larger than a right angle, is connected to an end of the mounting portion 71 in the longitudinal direction, and extends into the engaging recess 28; and a projecting portion 73 that is connected to the first portion 72 and projects so as to protrude toward the downstream side in the direction of rotation A at a position close to an end on the downstream side in the direction of insertion of the bobbin case 5.
- the spring member 50b is a leaf spring formed of a spring steel plate having a thickness on the order of 0.15 mm, for example.
- the mounting portion 71 is fixed to the flange part 15 by a rivet 74.
Description
- The present invention relates to a vertical full rotation shuttle provided on a sewing machine.
- A vertical full rotation shuttle of the related art is described in, for example,
Patent Literature 1. The vertical full rotation shuttle of the related art includes an outer shuttle fixed to a lower shaft of the sewing machine and having a hook portion, an inner shuttle retained in a state of being accommodated in the outer shuttle, a bobbin case removably mounted in the inner shuttle, and a bobbin around which a lower thread is to be wound and configured to be accommodated in the bobbin case. - When a sewing action of the sewing machine is started, the lower shaft is rotated in a predetermined direction of rotation about a horizontal axis of rotation, and a sewing needle repeats an action of moving toward and away from the axis of rotation along an axial line perpendicular to the axis of rotation of the lower shaft. A needle thread inserted through the sewing needle is caught by a hook portion and forms a needle thread loop. The needle thread loop moves along a surface of the inner shuttle and passes over the lower thread, which causes the needle thread to engage with the lower thread drawn out from the inner shuttle through a needle hole in a needle plate over a sewing machine head, and stitches are formed on an object to be sewed.
- The inner shuttle includes a substantially cylindrical peripheral wall part, a bridge part that extends in one diameter direction so as to be connected to one end of the peripheral wall part in an axial direction thereof to form a bottom portion, a stud provided on the bridge part so as to extend upright toward the other end of the peripheral wall part in the axial direction, an outwardly extending flange that extends radially outward so as to be connected to the other end of the peripheral wall part in the axial direction, and a substantially C-shaped track projection that projects from an outer peripheral surface of the peripheral wall part and extends in a circumferential direction.
- The peripheral wall part is provided with a needle location hole in which the sewing needle is inserted, and the inner shuttle is restricted from rotating by a retaining member which is connected to a proximal end thereof to a body of a sewing machine so that the needle location hole is always aligned with an axial line of the sewing needle and is prevented from rotating following the outer shuttle.
- The bobbin case includes a cylindrical peripheral wall part that is fitted into the inner shuttle; an end wall portion provided so as to close an opening on one end side of the peripheral wall part; an engaging strip retained on the end wall portion so as to be movable in a direction of a diameter perpendicular to an axial line of the peripheral wall part, and also referred to as a latch; a latch spring that resiliently biases the engaging strip in one direction; and an operating lever that moves the engaging strip in the other direction against a spring force of the latch spring.
- The engaging strip includes a strip-shaped base portion; and an engaging portion that is connected at substantially a right angle to one end in a longitudinal direction of the base portion, and the engaging strip is resiliently biased in the one direction by the latch spring in a direction of causing the engaging portion to project in a state in which the engaging portion protrudes from the peripheral wall part. The latch spring is formed of a compression coil spring, and is accommodated in a spring accommodating hole provided in the end wall portion in parallel to the longitudinal direction of the engaging strip.
- The inner shuttle includes a peripheral wall part into which the peripheral wall part of the bobbin case can be approximately closely fitted; and a flange part that is connected to one end portion of the peripheral wall part on an opening end side, and the peripheral wall part and the flange part are provided with an engaging recess that extends across the peripheral wall part and the flange part so as to allow engagement of the above-described engaging portion. In a state in which the bobbin case is mounted in the inner shuttle, the engaging portion of the bobbin case fits into and engages with the engaging recess of the inner shuttle and the bobbin case is restricted from rotating with respect to the inner shuttle about an axial line of the inner shuttle.
- The
EP 0 507 558 B1 and theJP H10 216382 A - The prior art documents
CN 101 619 523 B ,JP 2010 012059 A JP S61 41674 U - Patent Literature 1:
JP-Y2 61-14375(1986) - In the related art described above, when the sewing action of the sewing machine is started, a reciprocal displacement action of the sewing needle and a rotational action of the outer shuttle cause the lower thread to be drawn out from the bobbin case in association with advance of the stitches during a sewing operation. Therefore, the bobbin is rotated in the bobbin case by a tensional force due to the feed of the lower thread. The bobbin case is restricted from rotating about the axial line of the inner shuttle as the engaging portion fits into and engages with the engaging recess of the inner shuttle as described above. However, since the bobbin case needs to be removably mountable with respect to the inner shuttle for replacing the bobbin, a clearance having a tolerance within a range of approximately 0.1 to 0.3 mm is provided between the engaging portion and the engaging recess in the direction of rotation thereof about the axial line of the inner shuttle. Therefore, there arises a problem of occurrence of vibrations in the bobbin case with respect to the inner shuttle mainly in the direction of rotation during a sewing operation, which may cause thread breakage or incidental looping due to changes in tension of an upper thread and a lower thread.
- An object of the invention is to provide a vertical full rotation shuttle that is capable of preventing occurrence of thread breakage and incidental looping.
- The invention provides a vertical full rotation shuttle including:
- an outer shuttle fixed to a lower shaft which is rotatable about an axis of rotation extending perpendicular to an axial line of a needle bar to which a sewing needle is attached, the outer shuttle including a hook portion having a distal end tapered toward a downstream side in a direction of rotation of the lower shaft;
- an inner shuttle retained by the outer shuttle so as to rotate about the axis of rotation, the inner shuttle including a peripheral wall part having a cylindrical shape and provided with a needle location hole in which the sewing needle can be inserted, and a flange part extending radially outward from one end of the peripheral wall part, an engaging recess being provided across the peripheral wall part and the flange part;
- a bobbin case removably mounted in the inner shuttle, the bobbin case having an engaging strip that removably engages with the engaging recess with a clearance in the direction of rotation;
- a spring member supported in the engaging recess and disposed in the clearance in a state in which the engaging strip engages with the engaging recess; and
- a bobbin accommodated in the bobbin case for winding a lower thread thereon.
- The vertical full rotation shuttle according to the invention is characterized in that the engaging strip includes an engaging portion that fits into and engages with the engaging recess and a base portion that has a long plate shape and is connected to the engaging portion in a state in which the bobbin case is mounted in the inner shuttle, and is formed into a substantially L-shape, in that the flange part is provided with the spring member that resiliently biases the engaging portion from an upstream side in the direction of rotation toward the downstream side in the direction of rotation by a spring force thereof in a state in which the engaging portion engages with the engaging recess, and in that the spring member is a leaf spring which is fixed to the flange part on the upstream side of the direction of rotation with respect to the engaging recess.
- According to the invention, it is preferably that the leaf spring includes a mounting portion that has a long plate shape and is fixed to the flange part on the upstream side of the direction of rotation with respect to the engaging recess; and a projection extending from one end in a longitudinal direction of the mounting portion into the clearance and projecting toward the downstream side in the direction of rotation.
- According to the invention, since the spring member is provided in the engaging recess of the inner shuttle, the engaging strip is resiliently biased by the spring member toward the downstream side in the direction of rotation in the state in which the bobbin case is mounted in the inner shuttle. Therefore, vibrations of the bobbin case with respect to the inner shuttle are restricted, and thus occurrence of thread breakage and incidental looping in association with changes in tension of the upper thread and the lower thread may be prevented.
- Other and further objects, features, and advantages of the invention will be more explicit from the following detailed description taken with reference to the drawings wherein:
-
FIG. 1 is a front view of a verticalfull rotation shuttle 1 according to an embodiment of the invention; -
FIG. 2 is a cross-sectional view of the verticalfull rotation shuttle 1 taken along the line II-II inFIG. 1 ; -
FIG. 3 is a front view of aninner shuttle 3; -
FIG. 4 is a front view of theinner shuttle 3 in which abobbin case 5 having abobbin 4 accommodated therein is mounted; -
FIG. 5 is a cross-sectional view taken along the line V-V inFIG. 3 ; -
FIG. 6 is a cross-sectional view taken along the line VI-VI inFIG. 4 ; -
FIG. 7 is an enlarged cross-sectional view of a portion near thespring member 50; -
FIG. 8 is a side view of theinner shuttle 3; -
FIG. 9 is a side view of the inner shuttle in which thebobbin case 5 is mounted; -
FIG. 10 is a back view of theinner shuttle 3; -
FIG. 11 is a back view of theinner shuttle 3 in which thebobbin case 5 is mounted; -
FIG. 12 is an enlarged cross-sectional view of a portion near aspring member 50a of theinner shuttle 3 provided on a vertical full rotation shuttle 1b according to another embodiment of the invention; -
FIG. 13 is an enlarged cross-sectional view of a portion near thespring member 50a of the inner shuttle in which thebobbin case 5 is mounted; -
FIG. 14 is an enlarged cross-sectional view illustrating a portion near aspring member 50b of the inner shuttle provided on a vertical full rotation shuttle 1b according to still another embodiment of the invention; and -
FIG. 15 is an enlarged cross-sectional view of a portion near thespring member 50b of theinner shuttle 3 in which thebobbin case 5 is mounted. - Referring now to the drawings, a preferred embodiments of the invention will be described in detail.
-
FIG. 1 is a front view of a verticalfull rotation shuttle 1 according to an embodiment of the invention, andFIG. 2 is a cross-sectional view of the verticalfull rotation shuttle 1 taken along the line II-II inFIG. 1 .FIG. 3 is a front view of aninner shuttle 3, andFIG. 4 is a front view of theinner shuttle 3 in which abobbin case 5 having abobbin 4 accommodated therein is mounted.FIG. 5 is a cross-sectional view taken along the line V-V inFIG. 3 , andFIG. 6 is a cross-sectional view taken along the line VI-VI inFIG. 4 . - The vertical
full rotation shuttle 1 of the invention includes anouter shuttle 2, theinner shuttle 3, abobbin 4, and abobbin case 5. Theouter shuttle 2 is fixed to alower shaft 8 that is rotated in a direction indicated by an arrow A about an axis of rotation L2, which is perpendicular to an axial line L1 of aneedle bar 7 on which asewing needle 6 is detachably coaxially mounted. Theouter shuttle 2 includes a tapered hook portion 9 having a distal end facing the downstream side in the direction of rotation A of thelower shaft 8. - The
inner shuttle 3 is fitted into theouter shuttle 2, and a projection of a retaining member, which is not illustrated, fits into arecess 10 to restrict theinner shuttle 3 from rotating. Theinner shuttle 3 includes a cylindricalperipheral wall part 12 provided with a needle location hole through which thesewing needle 6 is inserted; abottom portion 13 which is connected to other end portion of theperipheral wall part 12 in an axial direction thereof, extends in a direction of a diameter, and is also referred to as a bridge; astud 14 provided perpendicularly upright from a center of thebottom portion 13 toward one end portion of theperipheral wall part 12 in the axial direction thereof; aflange part 15 which is connected to the one end portion of theperipheral wall part 12 in the axial direction thereof and is formed so as to extend radially outward; and atrack projection 16 formed on theperipheral wall part 12 so as to project from an outer peripheral surface thereof. - The
inner shuttle 3 is provided with an engagingrecess 28 so as to extend across the peripheral wall part and theflange part 15. - The
outer shuttle 2 and theinner shuttle 3 are formed, for example, of carburized carbon steel, and are provided with a hardness of 650 HV or more by thermal treatment. Thebobbin 4 and thebobbin case 5 are formed of iron steel or stainless steel. - The
flange part 15 is provided with the needle location hole described above formed behind therecess 10, that is, on one end side of theperipheral wall part 12 in the axial direction thereof, and a lowerthread guiding groove 35 that opens toward a fitting space which is defined by therecess 10 and to which the projection of the retaining member described above, which is not illustrated, fits from the downstream side in the direction of rotation A. The lowerthread guiding groove 35 allows insertion of alower thread 21 drawn out from between a peripheral wall part of thebobbin case 5 and athread tensioning spring 33 provided on the peripheral wall part, so that thelower thread 21 passing through a needle hole of a needle plate provided on a sewing machine head in a tensed manner is maintained in a state of being fitted in the lowerthread guiding groove 35 and prevented from being protruded outside therecess 10 even though thelower thread 21 is loosened by a thread cutting action of a thread cutter, not illustrated, while leaving therecess 10 and coming apart completely at the time of passing over. - The
bobbin case 5 is removably mounted in theinner shuttle 3, and thebobbin 4 having thelower thread 21, which is referred to as a bobbin thread, wound therearound is accommodated in thebobbin case 5. Thebobbin case 5 is provided with afirst notch 22 that allows downward movement of thesewing needle 6. Thefirst notch 22 is formed in the peripheral wall part of thebobbin case 5 so as to extend in the axial direction and continues to asecond notch 23. Thebobbin case 5 is provided with alatch mechanism 25 that disengageably engages with theinner shuttle 3. - The inner
peripheral portion 17 of theinner shuttle 3 is provided with a pair ofprojections 24. Theprojections 24 come into contact with an inner surface of the peripheral wall part of thebobbin case 5 that opposes via thesecond notch 23. In this configuration, when mounting thebobbin case 5 in theinner shuttle 3, insertion of thebobbin case 5 into theinner shuttle 3 is guided, and relative angular displacement between thebobbin case 5 and theinner shuttle 3 is restricted in cooperation with thelatch mechanism 25. - The
latch mechanism 25 includes an operatinglever 26 and an engagingstrip 27, restricts the angular displacement between theinner shuttle 3 and thebobbin case 5 by the engagingstrip 27 engaging with the engagingrecess 28 formed on theinner shuttle 3, and locks thebobbin case 5 with respect to theinner shuttle 3 and prevents the same from coming out therefrom. When replacing thebobbin 4, by releasing the locked state of thebobbin case 5 with respect to theinner shuttle 3, thelatch mechanism 25 can release thebobbin case 5 from theinner shuttle 3. - In the vertical
full rotation shuttle 1 as described above, the engagingstrip 27 includes an engagingportion 27a that fits into and engages with the engagingrecess 28 and abase portion 27b that has a long plate shape and is connected to the engagingportion 27a in a state in which thebobbin case 5 is mounted in theinner shuttle 3, and is formed into a substantially L-shape. The engagingportion 27a engages with the engagingrecess 28 with a clearance in the direction of rotation. Theflange part 15 is provided with aspring member 50 that resiliently biases the engagingportion 27a from an upstream side in the direction of rotation A toward the downstream side in the direction of rotation A by a spring force thereof in a state in which the engagingportion 27a engages with the engagingrecess 28. The above-describedspring member 50 is disposed in the clearance described above. -
FIG. 7 is an enlarged cross-sectional view of a portion near thespring member 50,FIG. 8 is a side view of theinner shuttle 3, andFIG. 9 is a side view of theinner shuttle 3 in which thebobbin case 5 is mounted.FIG. 10 is a back view of theinner shuttle 3, andFIG. 11 is a back view of theinner shuttle 3 in which thebobbin case 5 is mounted. Thespring member 50 includes a mountingportion 51 that has a long plate shape and is fixed to the upstream side in the direction of rotation A with respect to the engagingrecess 28 of theflange part 15, and a projectingportion 52 that is bent from an end of the mountingportion 51 in the longitudinal direction at a substantially right angle, extends inward of the engagingrecess 28, and is bent to form a projection projecting toward the downstream side (upward inFIG. 7 ) in the direction of rotation A. Thespring member 50 is a leaf spring formed of a spring steel plate having a thickness on the order of 0.15 mm, for example. - As a method of fixing the mounting
portion 51 to theflange part 15, the mountingportion 51 may be fixed to theflange part 15 by providing theflange part 15 with a mountinggroove 53 extending in a direction of tangent line which is perpendicular to the axial line parallel to the longitudinal direction of the mountingportion 51 on an imaginary plane perpendicular to the axial line L2 of thelower shaft 8, and performing a swaging process in which bothside portions portion 51 is fitted into the mountinggroove 53 so as to cause the mountingportion 51 to be tightly interposed between theside portions - In order to facilitate mounting and removal of the
bobbin case 5 with respect to theinner shuttle 3, the projectingportion 52 includes afirst portion 56 that inclines toward the downstream side in the direction of rotation A when viewing in a direction of insertion of the engagingportion 27a into the engaging recess 28 (rightward inFIG. 7 ) and asecond portion 58 that extends via apeak portion 57 located on the downstream most side in the direction of rotation A and inclines toward the upstream side of the direction of rotation A toward the direction of insertion. - With the
spring member 50 configured as described above, in a state in which thebobbin case 5 is mounted in the inner shuttle, the engagingportion 27a engages with the engagingrecess 28, and thepeak portion 57 of thespring member 50 resiliently abuts on the engagingportion 27a and is pressed by a constant pressing force from the upstream side in the direction of rotation. Accordingly, vibrations of thebobbin case 5 with respect to theinner shuttle 3 are restricted during a sewing operation, it is possible to prevent changes in tension of the upper thread and the lower thread in association with the vibrations and occurrence of thread breakage and incidental looping. -
FIG. 12 is an enlarged cross-sectional view illustrating a portion near aspring member 50a of theinner shuttle 3 provided on a vertical full rotation shuttle 1a according to another embodiment of the invention, andFIG. 13 is an enlarged cross-sectional view of a portion near thespring member 50a of theinner shuttle 3 in which thebobbin case 5 is mounted. Portions corresponding to the above-described embodiment are denoted by the same reference numerals and overlapped description will be omitted. - The vertical full rotation shuttle 1a of this embodiment includes the
outer shuttle 2, theinner shuttle 3, thebobbin 4, thebobbin case 5, and thespring member 50a. In the vertical full rotation shuttle 1a of this embodiment, thespring member 50a includes a mountingportion 61, afirst portion 62 that has a substantially semi-cylindrical shape and is connected to the mountingportion 61 at one end portion in the longitudinal direction, and asecond portion 63 that is connected to thefirst portion 62 and is inclined toward the upstream side in the direction of rotation A when viewing in the direction of insertion (rightward inFIG. 12 ) of thebobbin case 5. Thespring member 50a is a leaf spring formed of a spring steel plate having a thickness on the order of 0.15 mm, for example. The mountingportion 61 is fixed to theflange part 15 in thegroove 53 by arivet 64. - The
spring member 50a as described above presses the engagingportion 27a by thesecond portion 63 on the downstream side in the direction of rotation A, and also in the direction of insertion of thebobbin case 5. Therefore, rattling and vibrations of thebobbin case 5 about the axial line L2 may be suppressed, and rattling and vibrations of the same in the direction of the axial line L2 may also be suppressed. Accordingly, it is possible to prevent occurrence of thread breakage and incidental looping more certainly. -
FIG. 14 is an enlarged cross-sectional view illustrating a portion near aspring member 50b of theinner shuttle 3 provided on a vertical full rotation shuttle 1b according to still another embodiment of the invention, andFIG. 15 is an enlarged cross-sectional view of a portion near thespring member 50b of theinner shuttle 3 in which thebobbin case 5 is mounted. Portions corresponding to the above-described embodiments are denoted by the same reference numerals and overlapped description will be omitted. - The vertical full rotation shuttle 1b of this embodiment includes the
outer shuttle 2, theinner shuttle 3, thebobbin 4, thebobbin case 5, and thespring member 50b. In the vertical full rotation shuttle 1b of this embodiment, thespring member 50b includes a mountingportion 71; afirst portion 72 that is bent at an angle larger than a right angle, is connected to an end of the mountingportion 71 in the longitudinal direction, and extends into the engagingrecess 28; and a projectingportion 73 that is connected to thefirst portion 72 and projects so as to protrude toward the downstream side in the direction of rotation A at a position close to an end on the downstream side in the direction of insertion of thebobbin case 5. Thespring member 50b is a leaf spring formed of a spring steel plate having a thickness on the order of 0.15 mm, for example. The mountingportion 71 is fixed to theflange part 15 by arivet 74. - By using the
spring member 50b as described above as well, it is possible to prevent occurrence of thread breakage and incidental looping by eliminating changes in tension of the upper thread and the lower thread in the same manner as the embodiments described above. -
- 1, 1a, 1b: Vertical full rotation shuttle
- 2: Outer shuttle
- 3: Inner shuttle
- 4: Bobbin
- 5: Bobbin case
- 6: Sewing needle
- 7: Needle bar
- 8: Lower shaft
- 9: Hook portion
- 10: Recess
- 12: Peripheral wall part
- 13: Bottom portion
- 14: Stud
- 15: Flange part
- 16: Track projection
- 17: Inner peripheral portion
- 21: Lower thread
- 22: Notch
- 23: Notch
- 24: Projection
- 25: Latch mechanism
- 26: Operating lever
- 27: Engaging strip
- 28: Engaging recess
- 33: Thread tensioning spring
- 35: Lower thread guiding groove
- 50, 50a, 50b: Spring member
- 51, 61, 71: Mounting portion
- 52, 57, 73: Projecting portion
- 53: Mounting groove
- 54a, 54b: Side portion
- 56, 62, 72: First portion
- 58, 63: Second portion
Claims (2)
- A vertical full rotation shuttle (1, 1a, 1b) comprising:an outer shuttle (2) fixed to a lower shaft (8) which is rotatable about an axis of rotation (L2) extending perpendicular to an axial line (L1) of a needle bar (7) to which a sewing needle (6) is attached, the outer shuttle (2) including a hook portion (9) having a distal end tapered toward a downstream side in a direction of rotation (A) of the lower shaft (8);an inner shuttle (3) retained by the outer shuttle (2) so as to rotate about the axis of rotation (L2), the inner shuttle (3) including a peripheral wall part (12) having a cylindrical shape and provided with a needle location hole in which the sewing needle (6) can be inserted, and a flange part (15) extending radially outward from one end of the peripheral wall part (12), an engaging recess (28) being provided across the peripheral wall part (12) and the flange part (15);a bobbin case (5) removably mounted in the inner shuttle (3), the bobbin case (5) having an engaging strip (27) that removably engages with the engaging recess (28) with a clearance in the direction of rotation (A);a spring member (50, 50a, 50b) supported in the engaging recess (28) and disposed in the clearance in a state in which the engaging strip (27) engages with the engaging recess (28) ; anda bobbin (4) accommodated in the bobbin case (5) for winding a lower thread (21) thereon,characterized in that the engaging strip (27) includes an engaging portion (27a) that fits into and engages with the engaging recess (28) and a base portion (27b) that has a long plate shape and is connected to the engaging portion (27a) in a state in which the bobbin case (5) is mounted in the inner shuttle (3), and is formed into a substantially L-shape, in that the flange part (15) is provided with the spring member (50, 50a, 50b) that resiliently biases the engaging portion (27a) from an upstream side in the direction of rotation (A) toward the downstream side in the direction of rotation (A) by a spring force thereof in a state in which the engaging portion (27a) engages with the engaging recess (28), and in that the spring member (50, 50a, 50b) is a leaf spring which is fixed to the flange part (15) on the upstream side of the direction of rotation (A) with respect to the engaging recess (28).
- The vertical full rotation shuttle (1, 1a, 1b) according to claim 1, wherein the leaf spring includes a mounting portion (51, 61, 71) that has a long plate shape and is fixed to the flange part (15) on the upstream side of the direction of rotation (A) with respect to the engaging recess (28); and a projection (52, 57, 73) extending from one end in a longitudinal direction of the mounting portion (51, 61, 71) into the clearance and projecting toward the downstream side in the direction of rotation (A).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2015/054038 WO2016129122A1 (en) | 2015-02-13 | 2015-02-13 | Vertical full rotation hook |
Publications (3)
Publication Number | Publication Date |
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EP3257992A1 EP3257992A1 (en) | 2017-12-20 |
EP3257992A4 EP3257992A4 (en) | 2018-07-04 |
EP3257992B1 true EP3257992B1 (en) | 2023-04-05 |
Family
ID=56614282
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP15881996.1A Active EP3257992B1 (en) | 2015-02-13 | 2015-02-13 | Vertical full rotation shuttle |
Country Status (5)
Country | Link |
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EP (1) | EP3257992B1 (en) |
JP (1) | JP6440746B2 (en) |
KR (1) | KR101962264B1 (en) |
CN (1) | CN107109747B (en) |
WO (1) | WO2016129122A1 (en) |
Families Citing this family (2)
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JP7369438B2 (en) | 2019-10-02 | 2023-10-26 | 株式会社 神崎高級工機製作所 | Reduction/reversing machine |
JP7369439B2 (en) | 2019-10-16 | 2023-10-26 | 株式会社 神崎高級工機製作所 | Reduction/reversing machine |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6314375Y2 (en) * | 1981-01-12 | 1988-04-22 | ||
JPS58152277U (en) * | 1982-04-01 | 1983-10-12 | 株式会社廣瀬製作所 | full rotation hook of sewing machine |
JPS6114375U (en) | 1984-06-29 | 1986-01-28 | 追浜工業株式会社 | engine tachometer |
JPS6141674U (en) * | 1984-08-23 | 1986-03-17 | ジャガー株式会社 | Full-rotation hook of sewing machine |
JPH0268096A (en) * | 1988-09-01 | 1990-03-07 | Hirose Mfg Co Ltd | Full rotary hook for lock stitch sewing machine |
JP2972965B2 (en) * | 1991-03-31 | 1999-11-08 | ブラザー工業 株式会社 | Full rotation of the sewing machine |
JPH0642626Y2 (en) * | 1991-11-05 | 1994-11-09 | 株式会社廣瀬製作所 | Vertical full rotary hook |
TW370120U (en) * | 1997-01-29 | 1999-09-11 | Hirose Mfg Co Ltd | Sewing machine shuttle |
JP2824246B2 (en) * | 1997-02-07 | 1998-11-11 | 株式会社廣瀬製作所 | Sewing machine bite |
DE19983955B8 (en) * | 1999-05-28 | 2009-12-10 | Hirose Manufacturing Co. Ltd. | Circumferential gripper |
JP5197197B2 (en) * | 2008-07-04 | 2013-05-15 | Juki株式会社 | Sewing machine bobbin case |
ITMI20130324A1 (en) * | 2013-03-04 | 2014-09-05 | Cm Cerliani S R L | ROTARY CROCHET WITH CAPSULE FOR SEWING MACHINE WITH A TAPPED STITCH INCLUDING MEANS TO REDUCE GAMES BETWEEN CAPSULE AND BASKET AND REDUCE NOISE |
-
2015
- 2015-02-13 WO PCT/JP2015/054038 patent/WO2016129122A1/en active Application Filing
- 2015-02-13 KR KR1020177012098A patent/KR101962264B1/en active IP Right Grant
- 2015-02-13 EP EP15881996.1A patent/EP3257992B1/en active Active
- 2015-02-13 CN CN201580061246.2A patent/CN107109747B/en active Active
- 2015-02-13 JP JP2016574612A patent/JP6440746B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP3257992A4 (en) | 2018-07-04 |
JP6440746B2 (en) | 2018-12-19 |
KR20170065627A (en) | 2017-06-13 |
CN107109747A (en) | 2017-08-29 |
CN107109747B (en) | 2019-08-13 |
WO2016129122A1 (en) | 2016-08-18 |
KR101962264B1 (en) | 2019-03-26 |
JPWO2016129122A1 (en) | 2017-11-30 |
EP3257992A1 (en) | 2017-12-20 |
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