VERTICAL FULL-ROTATION SHUTTLE, STITCHES MADE BY VERTICAL FULL-ROTATION SHUTTLE AND STITCH FORMING METHOD
The present invention relates to a vertical full-rotation shuttle, which leads a feed-side string portion of a needle thread loop to be wound around and hooked to a bobbin thread from one side of a bobbin case to the other side thereof according to the rotation of a hook part, and leads a stitch-side string portion of a needle thread to the surface of the bobbin case at one side of the bobbin case, such that the feed-side string portion of the needle thread turns the bobbin thread around and the needle thread loop jumps over the bobbin case so as to form complete stitches
The present invention relates to a vertically fully rotating shuttle provided in a sewing machine and an embroidering machine for sewing cloth and leather, a stitch made by the vertically fully rotating shuttle, and a method of manufacturing a stitch.
Related ArtThe driving shaft 5 is fixed to a base end part 2a of the outer shuttle 2 so that the outer shuttle 2 is turned around a rotation axis L1 by the driving shaft 5. A hook 6 is provided on the outer circumference of the outer shuttle 2 to capture a needle thread 10 inserted through a needle 11, and a thread guide 8 is provided along the outer circumference of the outer shuttle 2 outside the hook 6.
The inner shuttle 3 is encased in the outer shuttle to rotate freely in the state where the rotation caused by the rotation of the outer shuttle 2 is blocked. A flange 12 is formed at an open end side of the inner shuttle 3 such that one side of the base end part 2a of the outer shuttle 2 of the flange 12 is provided with a needle falling hole 9 through which the needle 11 is inserted.
The needle 11 reciprocates vertically through the needle falling hole 9 almost vertical to the rotation axis L1 of the outer shuttle 2. The outer shuttle 2, as pointed by an arrow A1 when viewing from the open end of the outer shuttle 2, rotates counterclockwise, and the hook 6 captures the needle thread 10 toward the base end part 2a of the outer shuttle 2 with respect to the traveling path of the needle 11 so that stitches are formed by the bobbin thread 7 and the needle thread 10.
By doing so, the needle thread loop doing the thread-pumping is decreased when the feeding thread portion 10a of the needle thread 10 is pulled up by a thread take-up lever (not shown) provided above the vertically fully rotating shuttle 1, and as illustrated in (3) of
According to the above-described existing vertically fully shuttle 1, since the feeding portion 10a of the needle thread 10 is guided and wound around the inner shuttle 3 between the outer shuttle 2 and the inner shuttle 3 which accommodate the bobbin case 4 when the hook 6 rotates, the stitch-sided thread portion 10b of the needle thread 10 is guided to the surface of the bobbin case 4 of the open end side of the inner shuttle 3 and the needle thread loop is jumped, the stitch-sided thread portion 10b of the needle thread 10 turns around the bobbin thread 7 to form the stitch and the final stitch is completed so that the final stitch 18 does not become a lock stitch and sewing quality is inferior.
Moreover, according to the existing vertically rotating shuttle 1, as illustrated in
The present invention has been made in view of the above problem, and the present invention provides a vertically fully rotating shuttle in which a feeding thread portion of a needle thread loop is guided and wound around a bobbin thread from one side to the other side of a bobbin case by the rotation of a hook, a stitch-sided thread portion of the needle thread is guided to the surface of the bobbin case in one end side of the bobbin case and turns around the bobbin thread, and the needle thread loop jumps the bobbin case such that the final stitch become a lock stitch.
According to the related art, the stitch-sided thread portion of the needle thread loop turns around the bobbin thread and the needle thread loop jumps, however, according to the present invention, since the feeding thread portion of the needle thread loop turns around the bobbin thread and the needle thread loop jumps by the above-described vertically fully rotating shuttle, the final stitch becomes a lock stitch so that the sewing product of uniform quality can be obtained.
Furthermore, according to the vertically fully rotating shuttle of the present invention, when viewing in the direction where the bobbin thread is stitched, the needle thread surrounds around the bobbin thread from the downstream to the upstream and is twisted to form a not-opened ring-shaped stitch, a portion of the needle thread covers the bobbin thread from directly above the respective stitches such that the bobbin thread cannot squeeze between the needle thread loop, thus the final stitch cannot be released when any one of the needle thread and the bobbin thread is cut off or tensed.
The objects, features and advantages of the present invention will be more apparent from the following detailed description in conjunction with the accompanying drawings, in which:
Hereinafter, exemplary embodiments of a vertically fully rotating shuttle according to the present invention are described in detail with reference to
In the following description, one side of a housing is a side adjacent to a power transmission rotation unit in the direction of a rotation central axis of the power transmission rotation unit and the other side of the housing is a side not adjacent to a power transmission rotation unit in the direction of a rotation central axis of the power transmission rotation unit.
The vertically fully rotating shuttle, as illustrated in
Thus, the bobbin case base separation preventing ring 800, the hook body 300, and the power transmission rotation unit 200 are to rotate together about the rotation axis L.
Moreover, the housing 100 has a hole 110 that is cut away on a part of the circumference thereof such that a needle 35 reciprocating vertically along a traveling path vertically crossing the rotation axis L can enter.
The hook body 300 has a taper-shaped hook 310 formed on the outer circumference in a state that an empty space communicating the hole 110 is formed in the downstream in the rotational direction, and the hook 310 captures a needle thread 36 of the needle 35 entered before the hook 310 via the hole 110 due to the rotation of the power transmission rotation unit 200.
The vertically fully rotation shuttle captures the needle thread 36 of the needle 35 passed through the respective cloth and descended, with the hook 310 rotated by the rotation of the power transmission rotation unit 200 at the same time when the clothes to be sewed are transmitted in the overlapped onto the through-hole 110 of
The needle thread 36 that is fed by a thread take-up lever (not shown), is inserted into the insertion through-hole of the needle 35 from the other side (a front side in
As illustrated at the very left side of
At the same time when the needle thread loop jumps the bobbin case base 700, the thread take-up lever pulls the feeding thread portion 36a of the needle thread 36 upwards in order to decrease the needle thread loop, and as illustrated at the second right side of
Thus, according to the vertically fully rotating shuttle, since the feeding thread portion 36 of the needle thread 36 turns around the bobbin thread 34 and the needle thread loop jumps, the completed stitch becomes a lock stitch and uniform quality of sewed products can be obtained.
Furthermore, according to the vertically fully rotating shuttle of the present invention, when viewing in the direction where the bobbin thread 34 is stitched as illustrated at the very right side of
Claims
1. A vertically fully rotating shuttle comprising:
- a fixed housing (100);
- a hook body (300) rotatably installed in the housing (100) to rotate about a rotational axis vertical to a travelling path of a needle reciprocating;
- a bobbin case base (700) inserted into the hook body (300) not to rotate about the hook body (300); and
- a bobbin (400), around which bobbin thread (34) is wound, detachably mounted to the bobbin case base (700);
- wherein the hook body (300) comprises a hook (310);
- wherein the hook (310) is disposed at the other side of the housing (100) rather than a needle (35), penetrates and captures a loop of a needle thread (36) at the upstream in the rotational direction of the hook (310) prior to a bobbin thread (34), a feeding thread portion (36a) of the needle thread (36) turns around the bobbin thread (34) such that the loop of the needle thread jumps with respect to the bobbin case base (700).
2. The vertically fully rotating shuttle of claim 1, further comprising:
- a hook body separation preventing ring (600) rotatably circumscribed to the hook body (300) in a state of fixedly inscribed to an inner circumference of one side of the housing (100) and preventing the hook body (300) from separating from one side of the housing (100); and
- a bobbin case base separation preventing ring (800) rotatably circumscribed to the bobbin case base (700) with a gap through which the needle thread (36) passes in a state of fixedly inscribed to an inner circumference of the other side of the housing (100), and coming into contact with and being fixed to the hook body (300) such that the bobbin case base (700) is prevented from separating from the other side of the housing (100).
3. A stitch formed by a needle thread of a needle provided in a sewing machine or an embroidering machine and moving up and down, and by a bobbin thread provided in a vertically fully rotating shuttle,
- wherein, in the direction where the bobbin thread is stitched, the needle thread surrounds the bobbin thread from downstream to upstream and is twisted to form a ring-shaped stitch.
4. A stitching method of stitching an object to be stitched using a needle thread wound around a needle thread bobbin provided in a sewing machine or an embroidering machine and a bobbin thread of a bobbin case base installed in a vertically fully rotating shuttle, the method comprising:
- penetrating and capturing a loop of the needle thread prior to the bobbin thread when a needle reciprocating up and down descends and drawing the loop of the needle thread to form a bigger loop of the needle thread;
- turning a feeding thread portion of the needle thread around the bobbin thread and thread-jumping the loop of the needle with respect to the bobbin case base;
- winding the needle thread around the bobbin thread and inserting the needle thread into the bobbin thread by pulling the feeding thread portion of the needle thread upwards in order to decrease the loop of the needle thread; and
- further pulling the feeding thread portion of the needle thread upwards such that the bobbin thread and the needle thread are wound and locked near seams of the object to be stitched.
Type: Application
Filed: Dec 4, 2015
Publication Date: Dec 27, 2018
Applicant: MICROCORE CO.,LTD. (Daegu)
Inventor: So-dae KANG (Seoul)
Application Number: 15/781,449