EP4653595A1 - Full rotation hook - Google Patents

Full rotation hook

Info

Publication number
EP4653595A1
EP4653595A1 EP25177988.0A EP25177988A EP4653595A1 EP 4653595 A1 EP4653595 A1 EP 4653595A1 EP 25177988 A EP25177988 A EP 25177988A EP 4653595 A1 EP4653595 A1 EP 4653595A1
Authority
EP
European Patent Office
Prior art keywords
hook
full rotation
outer shuttle
track
face
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.)
Pending
Application number
EP25177988.0A
Other languages
German (de)
French (fr)
Inventor
Hidefumi IMABAYASHI
Jun Hatanaka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hirose Manufacturing Co Ltd
Original Assignee
Hirose Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2025039417A external-priority patent/JP2025178115A/en
Application filed by Hirose Manufacturing Co Ltd filed Critical Hirose Manufacturing Co Ltd
Publication of EP4653595A1 publication Critical patent/EP4653595A1/en
Pending legal-status Critical Current

Links

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
    • 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

Definitions

  • the present invention relates to a full rotation hook such as vertical full rotation hooks and horizontal full rotation hooks.
  • JP H06-238084 A A full rotation hook of the conventional technique is described in Japanese Patent Application Laid-Open No. Hei 6-238084 ( JP H06-238084 A ), for example.
  • JP H06-238084 A an inner holder in a sewing machine is described, in which a track projection, made of a high-density polyethylene containing a lubricating material, a liquid crystal polymer, or a mixture of aluminum alloy powder and alumina powder, is detachably and replaceably fixed to the outer circumference of an inner holder body, so that rotational torque of an outer shuttle can be reduced and stable high-speed rotation of the outer shuttle can be achieved.
  • a full rotation hook in JP 2008-295966 A includes an inner holder having a track projection that extends in a circumferential direction and that is made of a heat resistant synthetic resin, and an outer shuttle having a track groove that fits into the track projection, the track groove having an inner circumference covered with a coating that is made of a diamond like carbon (DLC). Since such a configuration is adopted for the full rotation hook in JP 2008-295966 A , the outer shuttle rotates at high speeds of about 8,000 rpm to 12,000 rpm. Therefore, even when that contact portions between the track projection and the track groove are heated to high temperatures by frictional heat, it is reported that seizure between the track projection and the track groove can be prevented to allow smooth sewing.
  • DLC diamond like carbon
  • the track projection of the inner holder is formed of a high-density polyethylene containing a lubricating material, a liquid crystal polymer, or a mixture of aluminum alloy powder and alumina powder.
  • the track projection of the inner holder is formed of a heat resistant synthetic resin.
  • An object of the present invention is to provide a full rotation hook with high durability, in particular to overcome disadvantageous of prior art.
  • the present invention relates to a full rotation hook, characterized by including:
  • the full rotation hook according to the present invention is preferably characterized in that the notch part has a first face that extends radially outward and a second face that faces the first face.
  • the full rotation hook according to the present invention is preferably characterized in that the first face is located facing a downstream side in a rotation direction of the outer shuttle.
  • the full rotation hook according to the present invention is in particular characterized in that the first face is convexly bent to the upstream side in the rotation direction of the outer shuttle.
  • the full rotation hook according to the present invention is preferably characterized in that the first face and the second face are separated in the circumferential direction.
  • the full rotation hook according to the present invention is in particular characterized in that the second face extends radially outward.
  • the full rotation hook according to the present invention is in particular characterized in that a recess groove extending in the circumferential direction is provided on a bottom surface of the track groove.
  • the full rotation hook according to the present invention is preferably characterized in that the full rotation hook is a vertical full rotation hook.
  • the full rotation hook according to the present invention is in particular characterized in that the full rotation hook is a horizontal full rotation hook.
  • the full rotation hook according to the present invention is preferably characterized in that an outer circumference of the track projection and an inner circumference of the track groove are separated with a gap of greater than or equal to 0.04 mm and less than or equal to 0.08 mm in a direction perpendicular to the rotation axial line.
  • the full rotation hook according to the present invention is in particular characterized in that the track projection is made of a heat resistant synthetic resin.
  • the outer shuttle includes in particular the vent hole opens to the track groove, and the vent hole is supplied with compressed air.
  • the track projection of the inner holder fits preferably into the track groove of the outer shuttle, and the compressed air is supplied to the gap between the track projection and the track groove through the vent hole.
  • the compressed air passes between the track groove and the track projection.
  • the compressed air reduces in particular the friction resistance caused by contact between the track groove of the outer shuttle and the track projection of the inner holder, so that the rotational resistance against the outer shuttle can be reduced. Since the compressed air passes preferably through the notch part of the track projection that opens radially outward, the rotation of the inner holder caused by rotation of the outer shuttle is suppressed.
  • This effect enables in particular an upper thread loop of the upper thread caught by the hook point of the outer shuttle to smoothly pass through a shuttle stopping part with which the outer shuttle and the inner holder come into contact.
  • the seizure between the track projection and the track groove can be prevented and high-quality stitches can be formed by smooth passing of the thread.
  • This effect eliminates in particular the necessity of using a lubrication oil as in the conventional techniques and thereby prevents upper and lower threads, materials to be sewed, or the like from being contaminated due to adhesion of the lubrication oil. Therefore, the efficiency of sewing work can in particular be improved.
  • the notch part has preferably a first face and a second face. Accordingly, an airflow of the compressed air passing through the notch part comes in particular into contact with the first face and the second face to suppress co-rotation of the inner holder caused by the rotation of the outer shuttle, so that the thread passing operation preferably can be facilitated and smoothed, and thereby the sewing quality can be improved.
  • the first face of the notch part is in particular located facing the downstream side in the rotation direction of the outer shuttle. Accordingly, an airflow of the compressed air passing through the notch part more effectively acts on the first face, which makes it possible to resist the rotation force by the co-rotation of the inner holder.
  • This effect can preferably counteract the torque acting on the inner holder caused by the rotation of the outer shuttle, which makes it possible to increase the force that resists the rotation force by the co-rotation of the inner holder, so that the stress on the upper thread, which passes between the inner holder and the shuttle stopping part that comes into contact with the inner holder, can be reduced.
  • the first face of the notch part is in particular convexly bent to the downstream side in the rotation direction of the outer shuttle.
  • the first face and the second face are in particular separated in the circumferential direction.
  • This configuration makes it preferably possible to make an airflow of the compressed air pass the notch part with a sufficient flow volume and to supply the compressed air to the gap between the track projection and the track groove.
  • the contact between the track projection and the track groove can preferably be reduced so that the friction between the track projection and the track groove can be reduced during the rotation of the outer shuttle.
  • the second face preferably extends radially outward. This makes it in particular possible to reduce the turbulence in the airflow of the compressed air passing through the notch part.
  • the vent hole in particular includes the first vent hole and the plurality of second vent holes. Accordingly, when the compressed air is preferably injected into the track groove from each of the first vent hole and the respective second vent holes, the amount of air injected from the first vent hole on the side including the hook point, with respect to a virtual plane that includes the rotation axial line of the outer shuttle, with the tip of the hook point being in contact with the virtual plane, is smaller than the amount of air injected from the plurality of second vent holes on the side opposite to the side including the hook point. It is therefore preferably possible to pressurize the outer shuttle against the inner holder by using the pressure of air injected from each of the second vent holes.
  • the track projection is preferably exposed to the compressed air from the first vent hole on one side and the compressed air from each of the second vent holes on the other side.
  • the rotation of the outer shuttle is in particular stabilized, and the inner holder is stably supported inside the outer shuttle. Therefore, when an upper thread that preferably has been caught by the hook point of the outer shuttle forms an upper thread loop and passes along the outer surface of the inner holder during sewing, a change in tension of the upper thread is suppressed and smooth passing of the thread is achieved. As a result, quality stitches are preferably formed without breaking the thread.
  • the recess groove is in particular provided on the bottom surface of the track groove. Accordingly, the compressed air supplied into the track groove through the vent holes is preferably guided in the circumferential direction by the recess groove, so that a substantially uniform compressed air is supplied to the gap between the track groove and the track projection in the circumferential direction, and in particular contact between the track groove and the track projection in particular can be prevented.
  • This configuration makes it preferably possible to reduce noise such as shuttle noise generated during sewing, while reducing heat generation due to frictional contact between the track projection and the track groove, thereby preventing seizure due to high-speed rotation of the outer shuttle, and enhancing in particular the durability of the outer shuttle and the inner holder.
  • the full rotation hook is configured preferably as a vertical full rotation hook. Accordingly, even when the outer shuttle is in particular rotated at high speeds, the heat of the track projection and the track groove can be in particular discharged to the outside through the cooling effect of the compressed air flowing between the track projection and the track groove, so that high-quality stitches preferably can stably be formed without occurrence of seizure, and the production efficiency of sewed products can be enhanced.
  • the full rotation hook is configured in particular as a horizontal full rotation hook. Accordingly, even when the outer shuttle is preferably rotated at high speeds, the temperature increase in the track projection and the track groove in particular can be suppressed by the cooling effect of the compressed air flowing between the track projection and the track groove, so that high-quality stitches preferably can stably be formed at high speeds and the production efficiency of sewed products can be enhanced.
  • the outer circumference of the track projection and the inner circumference of the track groove are separated with a gap of greater than or equal to 0.04 mm and less than or equal to 0.08 mm in the direction perpendicular to the rotation axial line. Accordingly, the compressed air injected through the vent holes preferably reliably forms an air layer in the gap between the track projection and the track groove. As a result, the track projection and the track groove are in particular prevented from coming into contact with each other with excessively large contact pressure. Therefore, even when the outer shuttle is preferably rotated at high speeds, seizure between the track projection and track groove in particular can be prevented, so that the full rotation hook that preferably does not cause oil contamination due to lubrication oil can be provided.
  • Fig. 1 is a sectional view showing the vertical full rotation hook 1 attached to a lower shaft 3 in the embodiment of the present invention.
  • Fig. 2 is an exploded perspective view of the vertical full rotation hook 1.
  • Fig. 3 is a front view of an outer shuttle 4.
  • Fig. 4 is a sectional view of the outer shuttle 4.
  • Fig. 5 is an enlarged view of a section V in Fig. 4 .
  • Fig. 6 is an enlarged sectional view showing a track projection 30 of an inner holder 5 that fits into a track groove 25 of the outer shuttle 4.
  • Fig. 7 is an enlarged view of a section VII in Fig. 6 .
  • FIG. 8A is a front view showing the vertical full rotation hook 1 arranged in a first rotation position.
  • Fig. 8B is a front view showing the vertical full rotation hook 1 arranged in a second rotation position.
  • Fig. 8C is a front view showing the vertical full rotation hook 1 arranged in a third rotation position.
  • part of an inner holder flange 27 and a hook point member are omitted to simplify the illustration.
  • the vertical full rotation hook 1 of the present embodiment includes the outer shuttle 4 fixed to one end of the lower shaft 3.
  • the lower shaft 3 is rotationally driven about a rotation axial line L2, which is perpendicular to a movement path L1 of a sewing needle 2 that reciprocates up and down.
  • the vertical full rotation hook 1 also includes the inner holder 5 accommodated in the outer shuttle 4, a bobbin case 6 detachably attached to the inner holder 5, and a bobbin that is accommodated in the bobbin case 6 and is used for winding a lower thread.
  • the sewing needle 2 and the lower shaft 3 are provided in a lockstitch sewing machine.
  • the outer shuttle 4 and the inner holder 5 are made of, for example, steel or stainless steel.
  • the lower shaft 3 is made of metal such as a structural steel bar, rotationally supported by a bearing 7 about the rotation axial line L2, and is inserted into a metal sleeve 10.
  • the lower shaft 3 is detachably fixed to a bottom part 21 of the outer shuttle 4 with bolts 38.
  • the sleeve 10 is accommodated in a sewing bed of the lockstitch sewing machine and fixed to the sewing bed by a bracket or other attaching members.
  • rotational force from an electric motor is transmitted via a rotational force transmission device such as a reduction gear, so that the lower shaft 3 and the outer shuttle 4 are rotationally driven at high speeds of, for example, about 8000 rpm to 12000 rpm about the rotation axial line L2.
  • the bearing 7 includes an outer ring 11 mounted onto the sleeve 10, an inner ring 12 that allows the lower shaft 3 to be inserted therethrough and that is fixed to the lower shaft 3, and a plurality of spherical rolling elements 13 attached between the outer ring 11 and the inner ring 12.
  • the bearing 7 may be an angular ball bearing.
  • a pair of fitting grooves 34a and 34b are formed to be adjacent to the bearing 7.
  • the pair of fitting grooves 34a and 34b is attached with annular seal members 35a and 35b (collectively referred to as "seal members 35").
  • the respective seal members 35a and 35b are spaced apart in the direction parallel to the rotation axial line L2.
  • the inner circumference of each of the seal members 35a and 35b is elastically in contact with the outside circumference of the lower shaft 3.
  • a hermetically sealed cylindrical space 16 is defined between the inner circumference of the sleeve 10 and the outer circumference of the lower shaft 3.
  • the seal members 35a and 35b may each be an O-ring made of synthetic rubber or synthetic resin, for example.
  • a diameter hole 14 extending in the direction of a single radial line perpendicular to the rotation axial line L2 of the lower shaft 3.
  • a shaft hole 15 that extends coaxially with the rotation axial line L2.
  • the diameter hole 14 and the shaft hole 15 communicate with each other.
  • a connection hole 17 is formed. The connection hole 17 opens to the space 16.
  • the diameter hole 14 provides communication between the space 16 and the shaft hole 15. Therefore, the compressed air that is supplied from a compressed air source 18 to the connection hole 17 through a connection pipe 19 flows into the diameter hole 14 through the space 16, and is supplied to vent holes 24 of the outer shuttle 4 through the shaft hole 15.
  • the pressure of the compressed air output from the compressed air source 18 to the connection pipe 19 may be, for example, greater than or equal to 5 kg/cm 2 or more and less than or equal to 10 kg/cm 2 .
  • connection hole 17 extends in a single radial direction from the inner circumference to the outer circumference of the sleeve 10.
  • the connection hole 17 is hermetically connected to the connection pipe 19, which is flexible.
  • existing equipment may be used, an example of such equipment being a compressor, which is installed in sewing factories or the like and is used for blowing out and removing foreign materials, such as lint adhering to the sewing bed or materials to be sewed.
  • the connection hole 17 may be configured so that the connection pipe 19 is detachably connected by using, for example, a quick coupling.
  • the outer shuttle 4 includes a cylindrical outer shuttle body 20; a bottom part 21 that is continuous to one end of the outer shuttle body 20 in the direction of an axial line that is aligned with the rotation axial line L2, the bottom part 21 being fixed to one end of the lower shaft 3; an inner holder stopping member 22 having a hook point 8 that catches the upper thread inserted into the sewing needle 2; a spring member 23 having an L-shaped cross-section and fixed to one end of the outer shuttle body 20 in the axial line direction; and a circumferential wall part 43 having the track groove 25.
  • the inner holder stopping member 22 is detachably fixed to the outer shuttle body 20 by bolts 52.
  • the spring member 23 is detachably fixed to the outer shuttle body 20 by bolts 53.
  • vent holes 24 are formed in the outer shuttle body 20 and the bottom part 21.
  • the vent holes 24 include a first vent hole 24a provided on the side where the hook point 8 is located, with respect to a virtual plane C1 that includes the rotation axial line L2 with a tip of the hook point 8 being in contact with the virtual plane C1, and a plurality of (two in the present embodiment) second vent holes 24b and 24c provided on the side opposite to the side where the hook point 8 is located with respect to the virtual plane C1.
  • the first vent hole 24a and the second vent holes 24b and 24c will be referred to as the vent holes 24 when referred to collectively.
  • the track groove 25 is formed on the inner circumference of the circumferential wall part 43 of the outer shuttle body 20.
  • the track groove 25 extends in the circumferential direction with the rotation axial line L2 as the center.
  • a recess groove 37 extending in the circumferential direction is provided.
  • the recess groove 37 which has a semicircular cross-sectional shape as shown in Fig. 5 , communicates with the first vent hole 24a and the second vent holes 24b and 24c.
  • each of the vent holes 24a to 24c and the radially outward portion of the recess groove 37 are continuous at a common point m. Therefore, between each of the vent holes 24a to 24c and the recess groove 37, there are no step surfaces that extends in the direction intersecting the flow of air, and therefore no significant flow resistance is generated against the airflow flowing into the track groove 25 through each of the vent holes 24a to 24c. This effect allows the air flowing through each of the vent holes 24a to 24c to flow into the track groove 25 without significant reduction in flow volume.
  • Fig. 6 is an enlarged sectional view showing the track projection 30 of the inner holder 5 that fits into the track groove 25 of the outer shuttle 4.
  • Fig. 7 is an enlarged view of the section VII in Fig. 6 .
  • An outside circumference 30a of the track projection 30 and an inner circumference 25a of the track groove 25 are separated with a gap ⁇ L of greater than or equal to 0.04 mm and less than or equal to 0.08 mm in a direction perpendicular to the rotation axial line L2.
  • the air flowing in through each of the vent holes 24a to 24c reliably forms an air layer across the entire circumference between the track projection 30 and the track groove 25 in the circumferential direction, which prevents the track projection 30 and the track groove 25 from coming into contact with each other with excessively large contact pressure. Therefore, even when the outer shuttle 4 is rotated at high speeds, seizure between the track projection 30 and the track groove 25 can be prevented. Therefore, since the occurrence of seizure between the track projection 30 and the track groove 25 can be prevented without using any lubrication oil, it is possible to provide the vertical full rotation hook 1 with which contamination of the upper thread, the lower thread, materials to be sewed, or the like by the lubrication oil does not occur.
  • the inner holder 5 includes: a substantially cylindrical inner holder body 26; an inner holder flange 27 that protrudes radially outward and is continuous to one end of the inner holder body 26 in the direction of its axis line that is aligned with the rotation axial line L2; the track projection 30 provided on the outer circumference of the inner holder body 26 and extending in the circumferential direction from a thread dividing part 28 to a thread release part 29; a bottom part 31 that is continuous to one end of the inner holder body 26 in its axis line direction and that extends in a diameter line direction; and a stud 32 that is erected on the bottom part 31 and extends toward one end of the inner holder body 26 in its axis line direction.
  • the stud 32 is detachably engaged with one longitudinal end of a latch member provided in the bobbin case 6.
  • the bobbin case 6 is removed from the inner holder 5, and the bobbin with a used up lower thread is replaced with a new bobbin having a wound lower thread, and afterwards the bobbin case 6 is attached to the inner holder 5.
  • the track groove 25 may be made of metal, for example.
  • the track projection 30 may be made of, for example, a synthetic resin and may preferably be made of a heat resistant synthetic resin.
  • the first vent hole 24a is provided on the side where the hook point 8 is located with respect to the virtual plane C1, and more specifically, is provided at an angular position forming a first angle ⁇ 1 on the upstream side in the outer shuttle rotation direction D from the virtual plane C1 that includes the rotation axial line L2 with the tip of the hook point 8 being in contact with the virtual plane.
  • the first angle ⁇ 1 is, for example, selected to be greater than or equal to 40° and less than or equal to 90°.
  • the inner diameters d of the first vent hole 24a and the second vent holes 24b and 24c may be, for example, 1.3 mm.
  • the inner diameters of the first vent hole 24a and the second vent holes 24b and 24c may be the same as or different from one another as long as the required pressure and flow volume can be ensured in the track groove 25.
  • the first vent hole 24a can be provided in the bottom part 21 of the outer shuttle 4 while the mechanical strength of the bottom part 21 can be maintained within an allowable range.
  • the two second vent holes 24b and 24c are provided on the side opposite to the side where the hook point 8 is located with respect to the virtual plane C1. More specifically, one of the second vent holes, 24c is provided at an angular position forming a second angle ⁇ 2 from the angular position of the first vent hole 24a on the upstream side in the outer shuttle rotation direction D, and the other second vent hole 24b is provided at an angular position forming a third angle ⁇ 3 from the angular position of the one second vent hole 24c on the upstream side in the outer shuttle rotation direction D.
  • the second angle ⁇ 2 is, for example, selected to be greater than or equal to 90° and less than or equal to 180°.
  • the third angle ⁇ 3 is, for example, selected to be greater than or equal to 10° and less than or equal to 90°.
  • the second vent hole 24c can be provided in the bottom part 21 of the outer shuttle 4 while the mechanical strength of the bottom part 21 can be maintained within an allowable range.
  • the second angle ⁇ 3 is set to be greater than or equal to 10° and less than or equal to 90°
  • the second vent hole 24b can be provided in the bottom part 21 of the outer shuttle 4 while the mechanical strength of the bottom part 21 can be maintained within an allowable range.
  • the first vent hole 24a and the second vent holes 24b and 24c provide communication between an inlet 44 and first and second outlets 45a and 45b, respectively.
  • the inlet 44 and the second outlets 45a and 45b are provided in the bottom part 21 of the outer shuttle 4.
  • the inlet 44 is formed of a space of a flat truncated cone having a central axis that coincides with the rotation axial line L2 of the bottom part 21.
  • the first outlet 45a is an opening connected to the space of the track groove 25 via the first vent hole 24a.
  • the second outlets 45b are openings connected to the space of the track groove 25 via the second vent holes 24b and 24c. Therefore, the compressed air supplied to the inlet 44 is supplied to the space of the track groove 25 via the first vent hole 24a and the second vent holes 24b and 24c.
  • the thread release part 29 is located at an angular position of a fourth angle ⁇ 4 on the upstream side from the virtual plane C1 in the outer shuttle rotation direction D.
  • the thread dividing part 28 is located at an angular position of a fifth angle ⁇ 5 on the downstream side from the virtual plane C1 in the outer shuttle rotation direction D.
  • the upper thread caught by the hook point 8 forms an upper thread loop in a state of being hooked to the thread dividing part 28, and the thread is released out from the thread release part 29 to form a single stitch.
  • a plurality of (two in this embodiment) second vent holes 24b and 24c are formed per the first vent hole 24a on the side opposite to the side where the first vent hole 24a is formed with respect to the virtual plane C1.
  • the inner holder 5 may be pressed by the upper thread to the upstream side in the outer shuttle rotation direction D, thereby being pressed toward the side opposite to the side where the hook point 8 is located with respect to the virtual plane C1 (the left side in FIG. 3 ).
  • the compressed air discharged from the second vent holes 24b and 24c allows the airflow to pass between the outer circumference 30a of the track projection 30 and the inner circumference of the track groove 25, thereby preventing the track projection 30 and the inner circumference of the track groove 25 from coming into contact with each other with a large force.
  • the outer shuttle 4 is provided with the vent holes 24 open to the track groove 25, and the vent holes 24 is supplied with compressed air.
  • the track projection 30 of the inner holder 5 fits into the track groove 25 of the outer shuttle 4, and the compressed air is supplied between the track projection 30 and the track groove 25 through the vent holes 24.
  • the compressed air passes between the track groove 25 and the track projection 30.
  • the compressed air reduces the friction resistance caused by the contact between the track groove 25 of the outer shuttle 4 and the track projection 30 of the inner holder 5, so that the rotational resistance against the outer shuttle 4 can be reduced.
  • the seizure between the track projection 30 and the track groove 25 can be prevented and high-quality stitches can be formed by smooth passing of the thread. Therefore, as in the prior art, it is not necessary to form the track projection 30 of the inner holder 5 with a heat-resistant synthetic resin. Furthermore, it is not necessary to form a film on the track projection 30.
  • Fig. 9 is an enlarged front view of a vicinity of a notch part 54
  • Fig. 10 is an enlarged perspective view of the vicinity of the notch part 54.
  • the track projection 30 has the notch part 54 that opens radially outward.
  • the notch part 54 has a first face 55 extending radially outward and a second face 56 facing the first face 55.
  • the notch part 54 is provided at an angular position forming an angle of 15° to 60° from the virtual plane C1 to the downstream side of the outer shuttle rotation direction D.
  • the first face 55 extends radially outward of the inner holder 5, and the second face 56 inclines in a direction away from the first face 55 as it becomes radially outward.
  • the second face 56 forms an angle ⁇ with respect to a tangent to the outer circumference of the inner holder body 26.
  • the angle ⁇ may be greater than or equal to 45° and less than or equal to 60°.
  • the track projection 30 has the notch part 54 that opens radially outward of the track projection 30, and the compressed air passes through the notch part 54.
  • the compressed air flows out radially outward after colliding with the first face 55.
  • the inner holder 5 can allow the flow of the compressed air to act in the direction opposite to the rotation direction D. Therefore, the rotation of the inner holder 5 caused by the rotation of the outer shuttle 4 can be restrained. This enables the upper thread loop of the upper thread caught by the hook point 8 of the outer shuttle 4 to smoothly pass through the shuttle stopping part with which the outer shuttle 4 and the inner holder 5 come into contact.
  • Fig. 11 is an enlarged plan view illustrating a modification 54a of the notch part
  • Fig. 12 is an enlarged perspective view of the notch part 54a illustrated in Fig. 11
  • the notch part 54a of the present embodiment has a first face 55a that extends to be inclined radially outward and a second face 56a that faces the first face 55a.
  • the first face 55a and the second face 56a are parallel to each other in the expanded state and form an angle ⁇ .
  • the angle ⁇ may be greater than or equal to 45° and less than and equal to 60°.
  • the notch part 54a has the first face 55a and the second face 55b, and thus, the airflow of the compressed air passing through the notch part 54a comes into contact with the first face 55a and the second face 56a to restrain co-rotation of the inner holder 5 caused by the rotation of the outer shuttle 4, so that the thread passing operation can be facilitated and smoothed, and thereby the sewing quality can be improved.
  • Fig. 13 is a front view illustrating an outer shuttle 4A according to another embodiment of the present invention. To avoid duplication of the description, parts corresponding to those of the above-described embodiments are denoted by the same reference numerals.
  • Fig. 13 in addition to the first vent hole 24a and the second vent holes 24b and 24c, still another second vent hole 24d is formed.
  • the inner holder 5 described above can be attached and the compressed air can be passed through the notch part 54. According to such a configuration, it is possible to increase the number of the vent holes 24 by one compared to the above-described embodiment. As a result, the compressed air can be supplied to the track groove 25 with a larger flow volume, so that the contact of the track projection 30 with the inner circumference of the track groove 25 can be more reliably suppressed.
  • Fig. 14 is a perspective view illustrating a horizontal full rotation hook 51 according to still another embodiment of the present invention.
  • Fig. 15 is an exploded perspective view of the horizontal full rotation hook 51.
  • Fig. 16 is a front view of an outer shuttle 4B.
  • Fig. 17 is a side view of the horizontal full rotation hook 51 cut away in part. Parts corresponding to those of the above-described embodiment are denoted by the same reference numerals.
  • the horizontal full rotation hook 51 includes an inner holder 5 that has a track projection 30 provided on an outer circumference thereof and extending along the circumferential direction, and an outer shuttle 4B that has a track groove 25 on an inner circumference, into which the track projection 30 fits, and that further has a hook point 8 that catches the upper thread supplied by a sewing needle 2.
  • the outer shuttle 4B is rotationally driven about a rotation axial line L2 while the rotation of the inner holder 5 is blocked.
  • the track projection 30 has a notch part 54 that opens radially outward.
  • the outer shuttle 4B has an outer shuttle body 20 and a bottom part 21. Vent holes 24 are formed in the outer shuttle body 20 and the bottom part 21.
  • the vent holes 24 include a first vent hole 24a provided on the side where the hook point 8 is located, with respect to a virtual plane C1 that includes the rotation axial line L2 with a tip of the hook point 8 being in contact with the virtual plane C1, and a plurality of (two in the present embodiment) second vent holes 24b and 24c provided on the side opposite to the side where the hook point 8 is located with respect to the virtual plane C1.
  • the first vent hole 24a and the second vent holes 24b and 24c will be referred to as the vent holes 24 when referred to collectively.
  • a track groove 25 is formed on an inner circumference of the circumferential wall part 43 of the outer shuttle body 20. The track groove 25 extends in the circumferential direction with the rotation axial line L2 as the center.
  • the inner holder 5 includes a cylindrical inner holder body 26, a track projection 30 provided on an outer circumference of the inner holder body 26 and extending in the circumferential direction, a bottom part 31 that is continuous to one end of the inner holder body 26 in the axis line direction and that extends in a single diameter line direction, and a stud 32 that is erected on the bottom part 31 and extends toward one end of the inner holder body 26 in the axis line direction.
  • the first vent hole 24a is provided on the side where the hook point 8 is located with respect to the virtual plane C1, and is provided at an angular position forming a first angle ⁇ 41 on the upstream side in the outer shuttle rotation direction D from the virtual plane C1 that includes the rotation axial line L2 with the tip of the hook point 8 being in contact with the virtual plane C1.
  • the first angle ⁇ 41 is, for example, selected to be greater than or equal to 50° and less than or equal to 115°.
  • the second vent hole 24b is provided at an angular position forming a second angle ⁇ 42 on the upstream side in the outer shuttle rotation direction D from the first vent hole 24a.
  • the second angle ⁇ 42 is, for example, selected to be greater than or equal to 115° and less than or equal to 250°.
  • the other second vent hole 24c is provided at an angular position forming a third angle ⁇ 43 on the upstream side in the outer shuttle rotation direction D from the second vent hole 24b.
  • the third angle ⁇ 43 is, for example, selected to be greater than or equal to 17° and less than or equal to 90°.
  • the inner diameters d of the first vent hole 24a and the second vent holes 24b and 24c may be, for example, 1.3 mm. That is, the inner diameter d is selected to be about 56% of the thickness T of the bottom part 31.
  • the inner diameters d of the first vent hole 24a and the second vent hole 24b,24c may be the same as or different from each other as long as the required pressure and flow volume can be ensured within the track groove 25.
  • the outer shuttle 4B is provided with the vent holes 24 that is supplied with compressed air and that open to the track groove 25.
  • the vent holes 24 may be configured to include a first vent hole 24a and three second vent holes 24b, 24c, and 24d, similar to the embodiment illustrated in Fig. 13 .
  • the full rotation hook is configured as the horizontal full rotation hook 51. Accordingly, even when the outer shuttle 4B is rotated at high speeds, the temperature increase in the track projection 30 and the track groove 25 can be suppressed due to the cooling effect of the compressed air flowing between the track projection 30 and the track groove 25, so that high-quality stitches can stably be formed at high speeds and the production efficiency of sewed products can be enhanced.
  • a notch part 54b that has a first face 55b and a second face 56b may be used.
  • the first face 55b is formed in a V-shape in a plan view, facing the downstream side in the outer shuttle rotation direction D.
  • a notch part 54c that has a first face 55c and a second face 56c may be used.
  • the first face 55c is formed to be inclined in a direction approaching the second face 56c in a plan view toward the downstream side in the outer shuttle rotation direction D.

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

Abstract

Provided is a full rotation hook (1) with high durability. The full rotation hook (1) includes: an inner holder (5) having a track projection (30) that extends in a circumferential direction along an outer circumference; and an outer shuttle (4, 4A, 4B) having a track groove (25) to fit into the track projection (30) and a hook point (8) that catches an upper thread supplied by a sewing needle (2). In this full rotation hook (1), the outer shuttle (4, 4A, 4B) is rotationally driven about a rotation axial line (L2) with the inner holder (5) being prevented from rotating; the outer shuttle (4, 4A, 4B) includes a bottom part (31) having an inlet (44) for being supplied with compressed air, and a circumferential wall part (43) having a plurality of outlets (45a, 45b) that open to a space (16) of the track groove (25); the bottom part (31) and the circumferential wall part (43) have vent holes (24) that provide communication between the inlet (44) and the outlets (45a, 45b); and the track projection (30) has a notch part (54) that opens radially outward.

Description

    Technical Field
  • The present invention relates to a full rotation hook such as vertical full rotation hooks and horizontal full rotation hooks.
    • Background Art
  • A full rotation hook of the conventional technique is described in Japanese Patent Application Laid-Open No. Hei 6-238084 ( JP H06-238084 A ), for example. In JP H06-238084 A , an inner holder in a sewing machine is described, in which a track projection, made of a high-density polyethylene containing a lubricating material, a liquid crystal polymer, or a mixture of aluminum alloy powder and alumina powder, is detachably and replaceably fixed to the outer circumference of an inner holder body, so that rotational torque of an outer shuttle can be reduced and stable high-speed rotation of the outer shuttle can be achieved.
  • Another conventional technique is described in Japanese Patent Application Laid-Open No. 2008-295966 ( JP 2008-295966 A ), for example. A full rotation hook in JP 2008-295966 A includes an inner holder having a track projection that extends in a circumferential direction and that is made of a heat resistant synthetic resin, and an outer shuttle having a track groove that fits into the track projection, the track groove having an inner circumference covered with a coating that is made of a diamond like carbon (DLC). Since such a configuration is adopted for the full rotation hook in JP 2008-295966 A , the outer shuttle rotates at high speeds of about 8,000 rpm to 12,000 rpm. Therefore, even when that contact portions between the track projection and the track groove are heated to high temperatures by frictional heat, it is reported that seizure between the track projection and the track groove can be prevented to allow smooth sewing.
    • Patent Literature 1: Japanese Patent Application Laid-Open No. Hei 6-238084 .
    • Patent Literature 2: Japanese Patent Application Laid-Open No 2008-295966 .
    Summary of Invention
  • In the conventional technique described in JP H06-238084 A , the track projection of the inner holder is formed of a high-density polyethylene containing a lubricating material, a liquid crystal polymer, or a mixture of aluminum alloy powder and alumina powder. In the conventional technique described in JP 2008-295966 A , the track projection of the inner holder is formed of a heat resistant synthetic resin. These conventional techniques in JP H06-238084 A and JP 2008-295966 A can prevent the seizure between the track projection and the track groove caused by high speed rotation of the outer shuttle. However, since the track projection is worn out by the friction between the outer shuttle and the inner holder, the track projection has problems of high replacement frequency and low durability.
  • An object of the present invention is to provide a full rotation hook with high durability, in particular to overcome disadvantageous of prior art.
  • The present invention relates to a full rotation hook, characterized by including:
    • an inner holder having a track projection that extends in a circumferential direction along an outer circumference; and
    • an outer shuttle having a track groove to fit into the track projection and a hook point that catches an upper thread supplied by a sewing needle, wherein:
      • the outer shuttle is rotationally driven about a rotation axial line with the inner holder being prevented from rotating;
      • the outer shuttle includes a bottom part having an inlet for being supplied with compressed air, and a circumferential wall part having a plurality of outlets that open to a space of the track groove;
      • the bottom part and the circumferential wall part have at least one vent hole that provides communication between the inlet and the outlets; and
      • the track projection has a notch part that opens radially outward.
  • The full rotation hook according to the present invention is preferably characterized in that the notch part has a first face that extends radially outward and a second face that faces the first face.
  • The full rotation hook according to the present invention is preferably characterized in that the first face is located facing a downstream side in a rotation direction of the outer shuttle.
  • The full rotation hook according to the present invention is in particular characterized in that the first face is convexly bent to the upstream side in the rotation direction of the outer shuttle.
  • The full rotation hook according to the present invention is preferably characterized in that the first face and the second face are separated in the circumferential direction.
  • The full rotation hook according to the present invention is in particular characterized in that the second face extends radially outward.
  • The full rotation hook according to the present invention is preferably characterized in that:
    • the plurality of outlets include preferably a first outlet and a second outlet; and
    • the vent hole includes a first vent hole that communicates preferably with the inlet and the first outlet, the first vent hole being provided on a side where the hook point is located with respect to a virtual plane that includes the rotation axial line and that in particular is in contact with a tip of the hook point, and at least one second vent hole that communicates with the inlet and the second outlet, the second vent hole being provided on a side opposite to a side where the hook point is in particular provided with respect to the virtual plane.
  • The full rotation hook according to the present invention is in particular characterized in that a recess groove extending in the circumferential direction is provided on a bottom surface of the track groove.
  • The full rotation hook according to the present invention is preferably characterized in that the full rotation hook is a vertical full rotation hook.
  • The full rotation hook according to the present invention is in particular characterized in that the full rotation hook is a horizontal full rotation hook.
  • The full rotation hook according to the present invention is preferably characterized in that an outer circumference of the track projection and an inner circumference of the track groove are separated with a gap of greater than or equal to 0.04 mm and less than or equal to 0.08 mm in a direction perpendicular to the rotation axial line.
  • The full rotation hook according to the present invention is in particular characterized in that the track projection is made of a heat resistant synthetic resin.
    • Advantageous Effects of Invention
  • According to the present invention, the outer shuttle includes in particular the vent hole opens to the track groove, and the vent hole is supplied with compressed air. The track projection of the inner holder fits preferably into the track groove of the outer shuttle, and the compressed air is supplied to the gap between the track projection and the track groove through the vent hole. When the outer shuttle is in particular rotationally driven about the rotation axial line, the compressed air passes between the track groove and the track projection. The compressed air reduces in particular the friction resistance caused by contact between the track groove of the outer shuttle and the track projection of the inner holder, so that the rotational resistance against the outer shuttle can be reduced. Since the compressed air passes preferably through the notch part of the track projection that opens radially outward, the rotation of the inner holder caused by rotation of the outer shuttle is suppressed. This effect enables in particular an upper thread loop of the upper thread caught by the hook point of the outer shuttle to smoothly pass through a shuttle stopping part with which the outer shuttle and the inner holder come into contact. As a result, even when the outer shuttle is rotationally driven preferably at high speeds, the seizure between the track projection and the track groove can be prevented and high-quality stitches can be formed by smooth passing of the thread. This effect eliminates in particular the necessity of using a lubrication oil as in the conventional techniques and thereby prevents upper and lower threads, materials to be sewed, or the like from being contaminated due to adhesion of the lubrication oil. Therefore, the efficiency of sewing work can in particular be improved.
  • According to the present invention, the notch part has preferably a first face and a second face. Accordingly, an airflow of the compressed air passing through the notch part comes in particular into contact with the first face and the second face to suppress co-rotation of the inner holder caused by the rotation of the outer shuttle, so that the thread passing operation preferably can be facilitated and smoothed, and thereby the sewing quality can be improved.
  • According to the present invention, the first face of the notch part is in particular located facing the downstream side in the rotation direction of the outer shuttle. Accordingly, an airflow of the compressed air passing through the notch part more effectively acts on the first face, which makes it possible to resist the rotation force by the co-rotation of the inner holder. This effect can preferably counteract the torque acting on the inner holder caused by the rotation of the outer shuttle, which makes it possible to increase the force that resists the rotation force by the co-rotation of the inner holder, so that the stress on the upper thread, which passes between the inner holder and the shuttle stopping part that comes into contact with the inner holder, can be reduced.
  • According to the present invention, the first face of the notch part is in particular convexly bent to the downstream side in the rotation direction of the outer shuttle. As a result, it is preferably possible to increase the area which an airflow of the compressed air passing the notch part is in contact with and in particular to further increase the force to resist the rotation force by the co-rotation of the inner holder. This effect can preferably further reduce the stress on the upper thread passing between the inner holder and the shuttle stopping part that comes into contact with the inner holder.
  • According to the present invention, the first face and the second face are in particular separated in the circumferential direction. This configuration makes it preferably possible to make an airflow of the compressed air pass the notch part with a sufficient flow volume and to supply the compressed air to the gap between the track projection and the track groove. As a result, the contact between the track projection and the track groove can preferably be reduced so that the friction between the track projection and the track groove can be reduced during the rotation of the outer shuttle.
  • According to the present invention, the second face preferably extends radially outward. This makes it in particular possible to reduce the turbulence in the airflow of the compressed air passing through the notch part.
  • According to the present invention, the vent hole in particular includes the first vent hole and the plurality of second vent holes. Accordingly, when the compressed air is preferably injected into the track groove from each of the first vent hole and the respective second vent holes, the amount of air injected from the first vent hole on the side including the hook point, with respect to a virtual plane that includes the rotation axial line of the outer shuttle, with the tip of the hook point being in contact with the virtual plane, is smaller than the amount of air injected from the plurality of second vent holes on the side opposite to the side including the hook point. It is therefore preferably possible to pressurize the outer shuttle against the inner holder by using the pressure of air injected from each of the second vent holes. Therefore, the track projection is preferably exposed to the compressed air from the first vent hole on one side and the compressed air from each of the second vent holes on the other side. As a result, the rotation of the outer shuttle is in particular stabilized, and the inner holder is stably supported inside the outer shuttle. Therefore, when an upper thread that preferably has been caught by the hook point of the outer shuttle forms an upper thread loop and passes along the outer surface of the inner holder during sewing, a change in tension of the upper thread is suppressed and smooth passing of the thread is achieved. As a result, quality stitches are preferably formed without breaking the thread.
  • According to the present invention, the recess groove is in particular provided on the bottom surface of the track groove. Accordingly, the compressed air supplied into the track groove through the vent holes is preferably guided in the circumferential direction by the recess groove, so that a substantially uniform compressed air is supplied to the gap between the track groove and the track projection in the circumferential direction, and in particular contact between the track groove and the track projection in particular can be prevented. This configuration makes it preferably possible to reduce noise such as shuttle noise generated during sewing, while reducing heat generation due to frictional contact between the track projection and the track groove, thereby preventing seizure due to high-speed rotation of the outer shuttle, and enhancing in particular the durability of the outer shuttle and the inner holder.
  • According to the present invention, the full rotation hook is configured preferably as a vertical full rotation hook. Accordingly, even when the outer shuttle is in particular rotated at high speeds, the heat of the track projection and the track groove can be in particular discharged to the outside through the cooling effect of the compressed air flowing between the track projection and the track groove, so that high-quality stitches preferably can stably be formed without occurrence of seizure, and the production efficiency of sewed products can be enhanced.
  • According to the present invention, the full rotation hook is configured in particular as a horizontal full rotation hook. Accordingly, even when the outer shuttle is preferably rotated at high speeds, the temperature increase in the track projection and the track groove in particular can be suppressed by the cooling effect of the compressed air flowing between the track projection and the track groove, so that high-quality stitches preferably can stably be formed at high speeds and the production efficiency of sewed products can be enhanced.
  • According to the present invention, preferably the outer circumference of the track projection and the inner circumference of the track groove are separated with a gap of greater than or equal to 0.04 mm and less than or equal to 0.08 mm in the direction perpendicular to the rotation axial line. Accordingly, the compressed air injected through the vent holes preferably reliably forms an air layer in the gap between the track projection and the track groove. As a result, the track projection and the track groove are in particular prevented from coming into contact with each other with excessively large contact pressure. Therefore, even when the outer shuttle is preferably rotated at high speeds, seizure between the track projection and track groove in particular can be prevented, so that the full rotation hook that preferably does not cause oil contamination due to lubrication oil can be provided.
  • Further features and advantages of embodiments of the invention are described below with reference to the figures. The same reference signs are used for identical or similar parts and for parts with identical or similar functions. Brief Description of Drawings:
    • Fig. 1 is a sectional view showing a vertical full rotation hook 1 attached to a lower shaft 3 in an embodiment of the present invention;
    • Fig. 2 is an exploded perspective view of the vertical full rotation hook 1;
    • Fig. 3 is a front view of an outer shuttle 4;
    • Fig. 4 is a sectional view of the outer shuttle 4;
    • Fig. 5 is an enlarged view of a section V in Fig. 4;
    • Fig. 6 is an enlarged sectional view showing a track projection 30 of an inner holder 5 that fits into a track groove 25 of the outer shuttle 4;
    • Fig. 7 is an enlarged view of a section VII in Fig. 6;
    • Fig. 8A is a front view showing the vertical full rotation hook 1 arranged in a first rotation position;
    • Fig. 8B is a front view showing the vertical full rotation hook 1 arranged in a second rotation position;
    • Fig. 8C is a front view showing the vertical full rotation hook 1 arranged in a third rotation position;
    • Fig. 9 is an enlarged front view of the vicinity of a notch part 54;
    • Fig. 10 is an enlarged perspective view of the vicinity of the notch part 54;
    • Fig. 11 is an enlarged plan view illustrating a modification 54a of the notch part;
    • Fig. 12 is an enlarged perspective view of the notch part 54a illustrated in Fig. 11;
    • Fig. 13 is a front view illustrating an outer shuttle 4A according to another embodiment of the present invention;
    • Fig. 14 is an external perspective view illustrating a horizontal full rotation hook 51 according to another embodiment of the present invention;
    • Fig. 15 is an exploded perspective view of the horizontal full rotation hook 51;
    • Fig. 16 is a front view of an outer shuttle 4B;
    • Fig. 17 is a side view of the horizontal full rotation hook 51 being cut away in part;
    • Fig. 18 is an enlarged plan view illustrating another modification of the notch part; and
    • Fig. 19 is an enlarged plan view illustrating still another modification of the notch part.
    Description of Embodiments
  • It is not necessary for a device according to the invention to have all the features described below. It is also possible for a device according to the invention to have only individual features of the embodiment examples described below.
  • With reference to Figs. 1 to 8, a vertical full rotation hook 1 of an embodiment of the present invention will be described. Fig. 1 is a sectional view showing the vertical full rotation hook 1 attached to a lower shaft 3 in the embodiment of the present invention. Fig. 2 is an exploded perspective view of the vertical full rotation hook 1. Fig. 3 is a front view of an outer shuttle 4. Fig. 4 is a sectional view of the outer shuttle 4. Fig. 5 is an enlarged view of a section V in Fig. 4. Fig. 6 is an enlarged sectional view showing a track projection 30 of an inner holder 5 that fits into a track groove 25 of the outer shuttle 4. Fig. 7 is an enlarged view of a section VII in Fig. 6. Fig. 8A is a front view showing the vertical full rotation hook 1 arranged in a first rotation position. Fig. 8B is a front view showing the vertical full rotation hook 1 arranged in a second rotation position. Fig. 8C is a front view showing the vertical full rotation hook 1 arranged in a third rotation position. In Fig. 8A, part of an inner holder flange 27 and a hook point member are omitted to simplify the illustration.
  • The vertical full rotation hook 1 of the present embodiment includes the outer shuttle 4 fixed to one end of the lower shaft 3. The lower shaft 3 is rotationally driven about a rotation axial line L2, which is perpendicular to a movement path L1 of a sewing needle 2 that reciprocates up and down. The vertical full rotation hook 1 also includes the inner holder 5 accommodated in the outer shuttle 4, a bobbin case 6 detachably attached to the inner holder 5, and a bobbin that is accommodated in the bobbin case 6 and is used for winding a lower thread. The sewing needle 2 and the lower shaft 3 are provided in a lockstitch sewing machine.
  • The outer shuttle 4 and the inner holder 5 are made of, for example, steel or stainless steel. The lower shaft 3 is made of metal such as a structural steel bar, rotationally supported by a bearing 7 about the rotation axial line L2, and is inserted into a metal sleeve 10. The lower shaft 3 is detachably fixed to a bottom part 21 of the outer shuttle 4 with bolts 38.
  • The sleeve 10 is accommodated in a sewing bed of the lockstitch sewing machine and fixed to the sewing bed by a bracket or other attaching members. To the other end of the lower shaft 3, rotational force from an electric motor is transmitted via a rotational force transmission device such as a reduction gear, so that the lower shaft 3 and the outer shuttle 4 are rotationally driven at high speeds of, for example, about 8000 rpm to 12000 rpm about the rotation axial line L2.
  • At one end of the sleeve 10, a short cylindrical fitting recess portion 33 is provided, and the bearing 7 is attached to the fitting recess portion 33. The bearing 7 includes an outer ring 11 mounted onto the sleeve 10, an inner ring 12 that allows the lower shaft 3 to be inserted therethrough and that is fixed to the lower shaft 3, and a plurality of spherical rolling elements 13 attached between the outer ring 11 and the inner ring 12. The bearing 7 may be an angular ball bearing.
  • On the inner circumference of the sleeve 10 in the one end, a pair of fitting grooves 34a and 34b are formed to be adjacent to the bearing 7. The pair of fitting grooves 34a and 34b is attached with annular seal members 35a and 35b (collectively referred to as "seal members 35"). The respective seal members 35a and 35b are spaced apart in the direction parallel to the rotation axial line L2. The inner circumference of each of the seal members 35a and 35b is elastically in contact with the outside circumference of the lower shaft 3. Between the seal members 35a and 35b, a hermetically sealed cylindrical space 16 is defined between the inner circumference of the sleeve 10 and the outer circumference of the lower shaft 3. The seal members 35a and 35b may each be an O-ring made of synthetic rubber or synthetic resin, for example.
  • Between the seal members 35a and 35b at one end of the lower shaft 3, there is formed a diameter hole 14 extending in the direction of a single radial line perpendicular to the rotation axial line L2 of the lower shaft 3. At one end of the lower shaft 3, there is formed a shaft hole 15 that extends coaxially with the rotation axial line L2. The diameter hole 14 and the shaft hole 15 communicate with each other. At one end of the sleeve 10, a connection hole 17 is formed. The connection hole 17 opens to the space 16.
  • The diameter hole 14 provides communication between the space 16 and the shaft hole 15. Therefore, the compressed air that is supplied from a compressed air source 18 to the connection hole 17 through a connection pipe 19 flows into the diameter hole 14 through the space 16, and is supplied to vent holes 24 of the outer shuttle 4 through the shaft hole 15. The pressure of the compressed air output from the compressed air source 18 to the connection pipe 19 may be, for example, greater than or equal to 5 kg/cm2 or more and less than or equal to 10 kg/cm2.
  • The connection hole 17 extends in a single radial direction from the inner circumference to the outer circumference of the sleeve 10. The connection hole 17 is hermetically connected to the connection pipe 19, which is flexible. As the compressed air source 18, existing equipment may be used, an example of such equipment being a compressor, which is installed in sewing factories or the like and is used for blowing out and removing foreign materials, such as lint adhering to the sewing bed or materials to be sewed. The connection hole 17 may be configured so that the connection pipe 19 is detachably connected by using, for example, a quick coupling.
    • Outer Shuttle
  • The outer shuttle 4 includes a cylindrical outer shuttle body 20; a bottom part 21 that is continuous to one end of the outer shuttle body 20 in the direction of an axial line that is aligned with the rotation axial line L2, the bottom part 21 being fixed to one end of the lower shaft 3; an inner holder stopping member 22 having a hook point 8 that catches the upper thread inserted into the sewing needle 2; a spring member 23 having an L-shaped cross-section and fixed to one end of the outer shuttle body 20 in the axial line direction; and a circumferential wall part 43 having the track groove 25.
  • The inner holder stopping member 22 is detachably fixed to the outer shuttle body 20 by bolts 52. The spring member 23 is detachably fixed to the outer shuttle body 20 by bolts 53.
  • With reference to Figs. 3 and 4, the vent holes 24 are formed in the outer shuttle body 20 and the bottom part 21. The vent holes 24 include a first vent hole 24a provided on the side where the hook point 8 is located, with respect to a virtual plane C1 that includes the rotation axial line L2 with a tip of the hook point 8 being in contact with the virtual plane C1, and a plurality of (two in the present embodiment) second vent holes 24b and 24c provided on the side opposite to the side where the hook point 8 is located with respect to the virtual plane C1. The first vent hole 24a and the second vent holes 24b and 24c will be referred to as the vent holes 24 when referred to collectively.
  • The track groove 25 is formed on the inner circumference of the circumferential wall part 43 of the outer shuttle body 20. The track groove 25 extends in the circumferential direction with the rotation axial line L2 as the center.
  • On the bottom part (bottom surface) of the track groove 25 of the outer shuttle 4, a recess groove 37 extending in the circumferential direction is provided. The recess groove 37, which has a semicircular cross-sectional shape as shown in Fig. 5, communicates with the first vent hole 24a and the second vent holes 24b and 24c.
  • With respect to the rotation axial line L2, the most radially outward portion of the inner circumference of each of the vent holes 24a to 24c and the radially outward portion of the recess groove 37 are continuous at a common point m. Therefore, between each of the vent holes 24a to 24c and the recess groove 37, there are no step surfaces that extends in the direction intersecting the flow of air, and therefore no significant flow resistance is generated against the airflow flowing into the track groove 25 through each of the vent holes 24a to 24c. This effect allows the air flowing through each of the vent holes 24a to 24c to flow into the track groove 25 without significant reduction in flow volume.
  • Fig. 6 is an enlarged sectional view showing the track projection 30 of the inner holder 5 that fits into the track groove 25 of the outer shuttle 4. Fig. 7 is an enlarged view of the section VII in Fig. 6. An outside circumference 30a of the track projection 30 and an inner circumference 25a of the track groove 25 are separated with a gap ΔL of greater than or equal to 0.04 mm and less than or equal to 0.08 mm in a direction perpendicular to the rotation axial line L2.
  • With such a configuration, the air flowing in through each of the vent holes 24a to 24c reliably forms an air layer across the entire circumference between the track projection 30 and the track groove 25 in the circumferential direction, which prevents the track projection 30 and the track groove 25 from coming into contact with each other with excessively large contact pressure. Therefore, even when the outer shuttle 4 is rotated at high speeds, seizure between the track projection 30 and the track groove 25 can be prevented. Therefore, since the occurrence of seizure between the track projection 30 and the track groove 25 can be prevented without using any lubrication oil, it is possible to provide the vertical full rotation hook 1 with which contamination of the upper thread, the lower thread, materials to be sewed, or the like by the lubrication oil does not occur.
    • Inner holder
  • With reference to Figs. 8A to 8C, the inner holder 5 includes: a substantially cylindrical inner holder body 26; an inner holder flange 27 that protrudes radially outward and is continuous to one end of the inner holder body 26 in the direction of its axis line that is aligned with the rotation axial line L2; the track projection 30 provided on the outer circumference of the inner holder body 26 and extending in the circumferential direction from a thread dividing part 28 to a thread release part 29; a bottom part 31 that is continuous to one end of the inner holder body 26 in its axis line direction and that extends in a diameter line direction; and a stud 32 that is erected on the bottom part 31 and extends toward one end of the inner holder body 26 in its axis line direction.
  • The stud 32 is detachably engaged with one longitudinal end of a latch member provided in the bobbin case 6. When the lower thread wound into a bobbin has been used up, the bobbin case 6 is removed from the inner holder 5, and the bobbin with a used up lower thread is replaced with a new bobbin having a wound lower thread, and afterwards the bobbin case 6 is attached to the inner holder 5. The track groove 25 may be made of metal, for example. The track projection 30 may be made of, for example, a synthetic resin and may preferably be made of a heat resistant synthetic resin.
    • Vent hole
  • The first vent hole 24a is provided on the side where the hook point 8 is located with respect to the virtual plane C1, and more specifically, is provided at an angular position forming a first angle θ1 on the upstream side in the outer shuttle rotation direction D from the virtual plane C1 that includes the rotation axial line L2 with the tip of the hook point 8 being in contact with the virtual plane.
  • The first angle θ1 is, for example, selected to be greater than or equal to 40° and less than or equal to 90°. The inner diameters d of the first vent hole 24a and the second vent holes 24b and 24c may be, for example, 1.3 mm. The inner diameters of the first vent hole 24a and the second vent holes 24b and 24c may be the same as or different from one another as long as the required pressure and flow volume can be ensured in the track groove 25.
  • When the first angle θ1 in Fig. 8A is set to be greater than or equal to 40° and less than or equal to 90°, the first vent hole 24a can be provided in the bottom part 21 of the outer shuttle 4 while the mechanical strength of the bottom part 21 can be maintained within an allowable range.
  • The two second vent holes 24b and 24c are provided on the side opposite to the side where the hook point 8 is located with respect to the virtual plane C1. More specifically, one of the second vent holes, 24c is provided at an angular position forming a second angle θ2 from the angular position of the first vent hole 24a on the upstream side in the outer shuttle rotation direction D, and the other second vent hole 24b is provided at an angular position forming a third angle θ3 from the angular position of the one second vent hole 24c on the upstream side in the outer shuttle rotation direction D. The second angle θ2 is, for example, selected to be greater than or equal to 90° and less than or equal to 180°. Further, the third angle θ3 is, for example, selected to be greater than or equal to 10° and less than or equal to 90°.
  • When the second angle θ2 is set to be greater than or equal to 90° and less than or equal to 180°, the second vent hole 24c can be provided in the bottom part 21 of the outer shuttle 4 while the mechanical strength of the bottom part 21 can be maintained within an allowable range. Furthermore, when the second angle θ3 is set to be greater than or equal to 10° and less than or equal to 90°, the second vent hole 24b can be provided in the bottom part 21 of the outer shuttle 4 while the mechanical strength of the bottom part 21 can be maintained within an allowable range.
  • The first vent hole 24a and the second vent holes 24b and 24c provide communication between an inlet 44 and first and second outlets 45a and 45b, respectively. Here, the inlet 44 and the second outlets 45a and 45b are provided in the bottom part 21 of the outer shuttle 4. The inlet 44 is formed of a space of a flat truncated cone having a central axis that coincides with the rotation axial line L2 of the bottom part 21. The first outlet 45a is an opening connected to the space of the track groove 25 via the first vent hole 24a. The second outlets 45b are openings connected to the space of the track groove 25 via the second vent holes 24b and 24c. Therefore, the compressed air supplied to the inlet 44 is supplied to the space of the track groove 25 via the first vent hole 24a and the second vent holes 24b and 24c.
  • As shown in Fig. 8A, the thread release part 29 is located at an angular position of a fourth angle θ4 on the upstream side from the virtual plane C1 in the outer shuttle rotation direction D. The thread dividing part 28 is located at an angular position of a fifth angle θ5 on the downstream side from the virtual plane C1 in the outer shuttle rotation direction D. The upper thread caught by the hook point 8 forms an upper thread loop in a state of being hooked to the thread dividing part 28, and the thread is released out from the thread release part 29 to form a single stitch.
  • In this embodiment, a plurality of (two in this embodiment) second vent holes 24b and 24c are formed per the first vent hole 24a on the side opposite to the side where the first vent hole 24a is formed with respect to the virtual plane C1. Suppose a case where when the upper thread passes, over a thread, through a space between an abutting part of the thread release part 29 facing the downstream side in the outer shuttle rotation direction D and a projecting part of an inner holder stopping member, the inner holder 5 may be pressed by the upper thread to the upstream side in the outer shuttle rotation direction D, thereby being pressed toward the side opposite to the side where the hook point 8 is located with respect to the virtual plane C1 (the left side in FIG. 3). Even in this case, the compressed air discharged from the second vent holes 24b and 24c allows the airflow to pass between the outer circumference 30a of the track projection 30 and the inner circumference of the track groove 25, thereby preventing the track projection 30 and the inner circumference of the track groove 25 from coming into contact with each other with a large force.
  • According to the present embodiment, the outer shuttle 4 is provided with the vent holes 24 open to the track groove 25, and the vent holes 24 is supplied with compressed air. The track projection 30 of the inner holder 5 fits into the track groove 25 of the outer shuttle 4, and the compressed air is supplied between the track projection 30 and the track groove 25 through the vent holes 24.
  • When the outer shuttle 4 is rotationally driven about the rotation axial line L2, the compressed air passes between the track groove 25 and the track projection 30. The compressed air reduces the friction resistance caused by the contact between the track groove 25 of the outer shuttle 4 and the track projection 30 of the inner holder 5, so that the rotational resistance against the outer shuttle 4 can be reduced. As a result, even when the outer shuttle 4 is rotationally driven at high speeds, the seizure between the track projection 30 and the track groove 25 can be prevented and high-quality stitches can be formed by smooth passing of the thread. Therefore, as in the prior art, it is not necessary to form the track projection 30 of the inner holder 5 with a heat-resistant synthetic resin. Furthermore, it is not necessary to form a film on the track projection 30. Therefore, it is possible to reduce the manufacturing cost of the vertical full rotation hook 1 and to shorten the manufacturing time. In addition, this eliminates the necessity of using a lubrication oil, and thereby prevents upper and lower threads, materials to be sewed, or the like from being contaminated due to adhesion of the lubricating oil. Therefore, the efficiency of sewing work can be improved.
    • Notch part
  • Fig. 9 is an enlarged front view of a vicinity of a notch part 54, and Fig. 10 is an enlarged perspective view of the vicinity of the notch part 54. The track projection 30 has the notch part 54 that opens radially outward. The notch part 54 has a first face 55 extending radially outward and a second face 56 facing the first face 55. The notch part 54 is provided at an angular position forming an angle of 15° to 60° from the virtual plane C1 to the downstream side of the outer shuttle rotation direction D.
  • The first face 55 extends radially outward of the inner holder 5, and the second face 56 inclines in a direction away from the first face 55 as it becomes radially outward. The second face 56 forms an angle α with respect to a tangent to the outer circumference of the inner holder body 26. The angle α may be greater than or equal to 45° and less than or equal to 60°.
  • In this manner, the track projection 30 has the notch part 54 that opens radially outward of the track projection 30, and the compressed air passes through the notch part 54. At this time, the compressed air flows out radially outward after colliding with the first face 55. As a result, the inner holder 5 can allow the flow of the compressed air to act in the direction opposite to the rotation direction D. Therefore, the rotation of the inner holder 5 caused by the rotation of the outer shuttle 4 can be restrained. This enables the upper thread loop of the upper thread caught by the hook point 8 of the outer shuttle 4 to smoothly pass through the shuttle stopping part with which the outer shuttle 4 and the inner holder 5 come into contact.
  • As a result, even when the outer shuttle 4 is rotationally driven at high speeds, the seizure between the track projection 30 and the track groove 25 can be prevented and high-quality stitches can be formed by smooth passing of the thread. Furthermore, this eliminates the necessity of using a lubrication oil as in the conventional techniques and thereby prevents upper and lower threads, materials to be sewed, or the like from being contaminated due to adhesion of the lubrication oil. Therefore, the efficiency of sewing work can be improved.
  • Fig. 11 is an enlarged plan view illustrating a modification 54a of the notch part, and Fig. 12 is an enlarged perspective view of the notch part 54a illustrated in Fig. 11. The notch part 54a of the present embodiment has a first face 55a that extends to be inclined radially outward and a second face 56a that faces the first face 55a. The first face 55a and the second face 56a are parallel to each other in the expanded state and form an angle β. The angle β may be greater than or equal to 45° and less than and equal to 60°.
  • With such a configuration adopted, the notch part 54a has the first face 55a and the second face 55b, and thus, the airflow of the compressed air passing through the notch part 54a comes into contact with the first face 55a and the second face 56a to restrain co-rotation of the inner holder 5 caused by the rotation of the outer shuttle 4, so that the thread passing operation can be facilitated and smoothed, and thereby the sewing quality can be improved.
  • Fig. 13 is a front view illustrating an outer shuttle 4A according to another embodiment of the present invention. To avoid duplication of the description, parts corresponding to those of the above-described embodiments are denoted by the same reference numerals. In the present embodiment, as shown in Fig. 13, in addition to the first vent hole 24a and the second vent holes 24b and 24c, still another second vent hole 24d is formed.
  • Even when such an outer shuttle 4A is used, the inner holder 5 described above can be attached and the compressed air can be passed through the notch part 54. According to such a configuration, it is possible to increase the number of the vent holes 24 by one compared to the above-described embodiment. As a result, the compressed air can be supplied to the track groove 25 with a larger flow volume, so that the contact of the track projection 30 with the inner circumference of the track groove 25 can be more reliably suppressed.
    • Horizontal full rotation hook
  • Fig. 14 is a perspective view illustrating a horizontal full rotation hook 51 according to still another embodiment of the present invention. Fig. 15 is an exploded perspective view of the horizontal full rotation hook 51. Fig. 16 is a front view of an outer shuttle 4B. Fig. 17 is a side view of the horizontal full rotation hook 51 cut away in part. Parts corresponding to those of the above-described embodiment are denoted by the same reference numerals. The horizontal full rotation hook 51 according to the present embodiment includes an inner holder 5 that has a track projection 30 provided on an outer circumference thereof and extending along the circumferential direction, and an outer shuttle 4B that has a track groove 25 on an inner circumference, into which the track projection 30 fits, and that further has a hook point 8 that catches the upper thread supplied by a sewing needle 2. The outer shuttle 4B is rotationally driven about a rotation axial line L2 while the rotation of the inner holder 5 is blocked. The track projection 30 has a notch part 54 that opens radially outward.
  • The outer shuttle 4B has an outer shuttle body 20 and a bottom part 21. Vent holes 24 are formed in the outer shuttle body 20 and the bottom part 21. The vent holes 24 include a first vent hole 24a provided on the side where the hook point 8 is located, with respect to a virtual plane C1 that includes the rotation axial line L2 with a tip of the hook point 8 being in contact with the virtual plane C1, and a plurality of (two in the present embodiment) second vent holes 24b and 24c provided on the side opposite to the side where the hook point 8 is located with respect to the virtual plane C1. The first vent hole 24a and the second vent holes 24b and 24c will be referred to as the vent holes 24 when referred to collectively. A track groove 25 is formed on an inner circumference of the circumferential wall part 43 of the outer shuttle body 20. The track groove 25 extends in the circumferential direction with the rotation axial line L2 as the center.
  • The inner holder 5 includes a cylindrical inner holder body 26, a track projection 30 provided on an outer circumference of the inner holder body 26 and extending in the circumferential direction, a bottom part 31 that is continuous to one end of the inner holder body 26 in the axis line direction and that extends in a single diameter line direction, and a stud 32 that is erected on the bottom part 31 and extends toward one end of the inner holder body 26 in the axis line direction.
  • The first vent hole 24a is provided on the side where the hook point 8 is located with respect to the virtual plane C1, and is provided at an angular position forming a first angle θ41 on the upstream side in the outer shuttle rotation direction D from the virtual plane C1 that includes the rotation axial line L2 with the tip of the hook point 8 being in contact with the virtual plane C1. The first angle θ41 is, for example, selected to be greater than or equal to 50° and less than or equal to 115°. In addition, the second vent hole 24b is provided at an angular position forming a second angle θ42 on the upstream side in the outer shuttle rotation direction D from the first vent hole 24a. The second angle θ42 is, for example, selected to be greater than or equal to 115° and less than or equal to 250°. The other second vent hole 24c is provided at an angular position forming a third angle θ43 on the upstream side in the outer shuttle rotation direction D from the second vent hole 24b. The third angle θ43 is, for example, selected to be greater than or equal to 17° and less than or equal to 90°.
  • The inner diameters d of the first vent hole 24a and the second vent holes 24b and 24c may be, for example, 1.3 mm. That is, the inner diameter d is selected to be about 56% of the thickness T of the bottom part 31. The inner diameters d of the first vent hole 24a and the second vent hole 24b,24c may be the same as or different from each other as long as the required pressure and flow volume can be ensured within the track groove 25.
  • The outer shuttle 4B is provided with the vent holes 24 that is supplied with compressed air and that open to the track groove 25. The vent holes 24 may be configured to include a first vent hole 24a and three second vent holes 24b, 24c, and 24d, similar to the embodiment illustrated in Fig. 13.
  • According to the embodiment illustrated in Figs. 14 to 17, the full rotation hook is configured as the horizontal full rotation hook 51. Accordingly, even when the outer shuttle 4B is rotated at high speeds, the temperature increase in the track projection 30 and the track groove 25 can be suppressed due to the cooling effect of the compressed air flowing between the track projection 30 and the track groove 25, so that high-quality stitches can stably be formed at high speeds and the production efficiency of sewed products can be enhanced.
  • In still another embodiment of the present invention, in place of the above-described notch parts 54 and 54a, as illustrated in Fig. 18, a notch part 54b that has a first face 55b and a second face 56b may be used. The first face 55b is formed in a V-shape in a plan view, facing the downstream side in the outer shuttle rotation direction D.
  • With such a configuration adopted, as indicated by the arrows a1 and b1, the air that has flown into the space in the notch part 54b from between the track projection 30 and the track groove 25 from the respective vent holes 24 collides with the V-shaped first face 55b. This configuration can add flow resistance. Therefore, since the pressure of the air passing through the space between the track projection 30 and the raceway hole 25 can be increased, it is possible to more effectively suppress the track projection 30 from coming in contact with the inner surface of the track groove 25 during the rotation of the outer shuttle.
  • In still another embodiment of the present invention, in place of the notch parts 54, 54a, and 54b described above, as illustrated in Fig. 19, a notch part 54c that has a first face 55c and a second face 56c may be used. The first face 55c is formed to be inclined in a direction approaching the second face 56c in a plan view toward the downstream side in the outer shuttle rotation direction D.
  • With such a configuration adopted, as indicated by the arrows c1 and d1, the air that has flowed into the space in the notch part 54c collides with the first face 55c that is inclined in a direction approaching the second face 56c in a plan view toward the downstream side in the outer shuttle rotation direction D. This configuration can add flow resistance. Therefore, since the pressure of the air passing through the space between the track projection 30 and the raceway hole 25 can be increased, it is possible to more effectively suppress the track projection 30 from coming in contact with the inner surface of the track groove 25 during the rotation of the outer shuttle.
  • While the embodiments of the present invention have been described in detail, the present invention is not limited to the above-described embodiments. Various changes, improvements, and the like can be made without departing from the gist of the present invention. It is needless to say that all or part of each of the above-described embodiments can be combined in an appropriate and non-inconsistent range.

Claims (12)

  1. A full rotation hook (1, 51), characterized by comprising:
    - an inner holder (5) having a track projection (30) that extends in a circumferential direction along an outer circumference; and
    - an outer shuttle (4, 4A, 4B) having a track groove (25) that is formed on an inner circumference and that defines a space into which the track projection (30) fits, and a hook point (8) that catches an upper thread supplied by a sewing needle (2), wherein:
    - the outer shuttle (4, 4A, 4B) is rotationally driven about a rotation axial line (L2) with the inner holder (5) being prevented from rotating;
    - the outer shuttle (4, 4A, 4B) includes a bottom part (31) having an inlet (44) for being supplied with compressed air, and a circumferential wall part (43) having a plurality of outlets (45a, 45b) that open to a space (16) of the track groove (25);
    - the bottom part (31) and the circumferential wall part (43) have at least one vent hole (24, 24a, 24b, 24c, 24d) that provides communication between the inlet (44) and the outlets (45a, 45b); and
    - the track projection (30) has a notch part (54, 54a, 54b, 54c) that opens radially outward.
  2. The full rotation hook (1, 51) according to claim 1,
    characterized in that the notch part (54, 54a, 54b, 54c) has a first face (55, 55a, 55b, 55c) that extends radially outward and a second face (56, 56a, 56b, 56c) that faces the first face (55, 55a, 55b, 55c).
  3. The full rotation hook (1, 51) according to claim 2,
    characterized in that the first face (55, 55a, 55b, 55c) is located facing a downstream side in a rotation direction (D) of the outer shuttle (4, 4A, 4B).
  4. The full rotation hook (1, 51) according to claim 2,
    characterized in that the first face (55, 55a, 55b, 55c) is convexly bent to an upstream side in a rotation direction (D) of the outer shuttle (4, 4A, 4B).
  5. The full rotation hook (1, 51) according to claim 2,
    characterized in that the first face (55, 55a, 55b, 55c) and the second face (56, 56a, 56b, 56c) are separated in the circumferential direction.
  6. The full rotation hook (1, 51) according to claim 2,
    characterized in that the second face (56, 56a, 56b, 56c) extends radially outward.
  7. The full rotation hook (1, 51) according to any one of claims 1 to 6, characterized in that
    - the plurality of outlets (45a, 45b) include a first outlet (45a) and a second outlet (45b); and
    - the vent hole (24, 24a, 24b, 24c, 24d) includes
    - a first vent hole (24a) that communicates with the inlet (44) and the first outlet (45a), the first vent hole (24a) being provided on a side where the hook point (8) is located with respect to a virtual plane (C1) that includes the rotation axial line (L2) with a tip of the hook point (8) being in contact with the virtual plane (C1), and
    - at least one second vent hole (24b, 24c, 24d) that communicates with the inlet (44) and the second outlet (45b), the second vent hole (24b, 24c, 24d) being provided on a side opposite to a side where the hook point (8) is provided with respect to the virtual plane (C1).
  8. The full rotation hook (1, 51) according to any one of claims 1 to 6, characterized in that a recess groove (37) extending in the circumferential direction is provided on a bottom surface of the track groove (25).
  9. The full rotation hook (1, 51) according to any one of claims 1 to 6, characterized in that the full rotation hook (1, 51) is a vertical full rotation hook (1).
  10. The full rotation hook (1, 51) according to any one of claims 1 to 6, characterized in that the full rotation hook (1, 51) is a horizontal full rotation hook (51).
  11. The full rotation hook (1, 51) according to any one of claims 1 to 6, characterized in that an outer circumference of the track projection (30) and an inner circumference of the track groove (25) are separated with a gap of greater than or equal to 0.04 mm and less than or equal to 0.08 mm in a direction perpendicular to the rotation axal line (L2).
  12. The full rotation hook (1, 51) according to any one of claims 1 to 6, characterized in that the track projection (30) is made of a heat resistant synthetic resin.
EP25177988.0A 2024-05-22 2025-05-21 Full rotation hook Pending EP4653595A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2024083703 2024-05-22
JP2025039417A JP2025178115A (en) 2024-05-22 2025-03-12 Fully rotating hook

Publications (1)

Publication Number Publication Date
EP4653595A1 true EP4653595A1 (en) 2025-11-26

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ID=95717557

Family Applications (1)

Application Number Title Priority Date Filing Date
EP25177988.0A Pending EP4653595A1 (en) 2024-05-22 2025-05-21 Full rotation hook

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EP (1) EP4653595A1 (en)
CN (1) CN121006657A (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4671196A (en) * 1983-09-06 1987-06-09 Hirose Manufacturing Company Limited Fully rotating hook for a lock stitch sewing machine
JPH06238084A (en) 1993-02-19 1994-08-30 Hirose Mfg Co Ltd Rotating hook bobbin case holder for sewing machine
JP2005319087A (en) * 2004-05-10 2005-11-17 Juki Corp Sewing machine horizontal pot
JP2008295966A (en) 2007-06-04 2008-12-11 Hirose Mfg Co Ltd Fully rotating hook
WO2017128290A1 (en) * 2016-01-29 2017-08-03 中山市旋霸缝纫设备有限公司 Outer shuttle frame and rotating shuttle

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4671196A (en) * 1983-09-06 1987-06-09 Hirose Manufacturing Company Limited Fully rotating hook for a lock stitch sewing machine
JPH06238084A (en) 1993-02-19 1994-08-30 Hirose Mfg Co Ltd Rotating hook bobbin case holder for sewing machine
JP2005319087A (en) * 2004-05-10 2005-11-17 Juki Corp Sewing machine horizontal pot
JP2008295966A (en) 2007-06-04 2008-12-11 Hirose Mfg Co Ltd Fully rotating hook
WO2017128290A1 (en) * 2016-01-29 2017-08-03 中山市旋霸缝纫设备有限公司 Outer shuttle frame and rotating shuttle

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