JP2019501748A - Vertical full rotary kettle, stitches made by this vertical full rotary kettle and stitch manufacturing method - Google Patents

Abstract

In the present invention, the supply side thread portion of the needle thread loop is guided so as to be wound around the bobbin thread on one side of the bobbin case according to the rotation of the hook portion, and the stitch side thread portion of the needle thread is one side of the bobbin case. The needle thread supply side thread portion is guided around the bobbin case and the needle thread loop passes over the bobbin case to form a complete stitch. .

Description

  The present invention relates to a vertical full rotary hook provided in a sewing machine and an embroidery machine that can be used to sew cloth, leather, etc., a stitch made by this vertical full rotary hook, and a stitch manufacturing method.

  FIG. 1 is a perspective view showing a prior art vertical full rotary hook 1. The vertical full rotary hook 1 is detachably mounted in the outer hook 2 fixed to the drive shaft 5, the inner hook 3 accommodated in the outer hook 2, and the inner hook 3, and the bobbin chamber 7 is wound. A bobbin case 4 for storing and holding the rotated bobbin is included.

  A drive shaft 5 is fixed to the base end portion 2 a of the outer hook 2, and the outer hook 2 is rotationally driven around the rotation axis L 1 by the drive shaft 5. A hook portion 6 that catches the needle thread 10 inserted through the needle 11 is provided on the outer periphery of the outer hook 2, and a thread guide 8 is provided on the outer periphery of the outer hook 2 along the outer periphery of the outer hook 2. Provided.

  The inner hook 3 is rotatably accommodated in the outer hook 2 in a state where the rotation associated with the rotation of the outer hook 2 is blocked. A flange 12 is formed on the open end side of the inner hook 3, and a needle drop hole 9 into which the needle 11 is inserted is formed on the base end 2 a side of the outer hook 2 of the flange 12.

  The needle 11 is reciprocated up and down through the needle drop hole 9 substantially perpendicular to the rotation axis L1 of the outer hook 2. The outer hook 2 is driven to rotate leftward (counterclockwise) as seen by the arrow A1 when viewed from the open end side of the outer hook 2, and the hook portion 6 is moved by the rotation of the outer hook 2. The needle thread 10 is captured on the base end 2 a side of the outer hook 2 with respect to the movement path 11, and the bobbin thread 7 and the needle thread 10 form a stitch (stitch).

  FIG. 2 is a drawing schematically showing a process of forming a seam when the two cloths 15 and 16 to be sewn are sewn forward. In FIG. 2, the outer hook 2 and the inner hook 3 are omitted. The cloths 15 and 16 are forward-sewn, in other words, the cloths 15 and 16 are fed and attached in the direction of the arrow B1, which is the same direction as the movement direction when the hook portion 6 captures the needle thread 10. At this time, as shown in FIG. 2A, the needle thread 10 is captured by the hook portion 6 on the upstream side in the rotational direction A1 of the outer hook 2 with respect to the bobbin thread 7 biased to the base end portion 2a of the outer hook 2. Is done. The needle thread 10 captured by the hook portion 6 forms a needle thread loop, and the supply-side thread portion 10a of the needle thread 10 includes an inner hook 3 that stores the bobbin case 4 according to the rotation of the hook section 6, an outer hook 2 The stitch side thread portion 10b of the needle thread 10 is guided to the surface of the bobbin case 4 on the open end side of the inner hook 3, as shown in FIG. 2 (2). As shown, the needle thread loop passes over the thread.

  In this way, the needle thread loop passing through the thread is pulled up by the supply thread portion 10a of the needle thread 10 by a balance (not shown) provided on the upper side of the vertical full rotary hook 1, and the needle thread loop becomes smaller. As shown in FIG. 2 (3), the bobbin thread 7 is wound. The supply-side thread portion 10a of the needle thread 10 is further pulled up by the balance so that the bobbin thread 7 and the needle thread 10 are engaged with each other in the vicinity of the joint of the two cloths 15 and 16 so as to be wound around each other. A stitch is formed. By repeating such a process of forming a series of stitches, a continuous stitch 18 is formed continuously as shown in FIG. 2 (4).

  In the above-described prior art vertical full rotary hook 1, the supply-side thread portion 10 a of the needle thread 10 is placed in the inner hook 3 between the inner hook 3 and the outer hook 2 that house the bobbin case 4 according to the rotation of the hook portion 6. The stitch side yarn portion 10b of the needle thread 10 is led to the surface of the bobbin case 4 on the open end side of the inner hook 3, and the needle thread loop passes over the thread. If the side yarn portion 10b goes around the bobbin yarn 7 and a stitch is formed to complete the completed stitch 18, the completed stitch 18 does not become a lock stitch, and the quality of the sewing product is deteriorated.

  Further, in the above-described prior art vertical full rotary hook 1, as shown in FIG. 3, when viewed from the traveling direction in which the bobbin thread 7 is stitched, the needle thread 10 moves around the bobbin chamber 7 from the upstream side. Ring-shaped stitches are formed one after another that can be opened in a staggered manner surrounding the downstream side, and there is no portion of the needle thread 10 that covers the bobbin thread 7 just above each stitch, The bobbin thread 7 can break out between the loops of the needle thread 10, and as shown on the left side of FIG. 8, either the needle thread 10 or the bobbin thread 7 breaks or the bobbin thread If the thread 7 is pulled in a tension state, there arises a problem that the complete stitch can be unwound.

  In order to solve the above-mentioned problems, the present invention has been introduced in which the supply thread portion of the needle thread loop is guided so as to be wound around the bobbin thread from one side of the bobbin case to the other side according to the rotation of the hook portion. The side thread part is led to the surface of the bobbin case on one side of the bobbin case, and the stitch side thread part of the needle thread goes around the bobbin thread to complete the needle thread loop over the bobbin case. It is intended to provide a vertical full rotary hook that can turn the stitches into lock stitches.

  Conventionally, the stitch side thread part of the needle thread loop has passed around the bobbin thread and the needle thread loop has passed over the thread. However, according to the present invention, the supply side thread part of the needle thread loop is the bobbin. Since the needle thread loop passes around the chamber and passes over the thread, the completed stitch becomes a lock stitch, and an effect that the quality of the sewing product is uniform can be obtained.

  In addition, the present invention forms a ring-shaped stitch that cannot be opened alternately by surrounding the bobbin yarn from the downstream side to the upstream side when viewed from the traveling direction in which the bobbin yarn is stitched. Then, there is a portion of the needle thread that covers the bobbin thread directly above each stitch, and the bobbin thread cannot be separated between loops of the needle thread. If any one of the bobbin threads is cut or the needle thread is pulled in a tension state, the complete stitch cannot be released.

It is the perspective view which showed the conventional vertical full rotation hook. FIG. 2 is a diagram schematically illustrating a process of forming a stitch when the forward sewing is performed using the vertical full rotary hook of FIG. 1. It is drawing which expanded and showed the completion stitch of FIG. It is sectional drawing which showed the vertical full rotation hook of this invention. It is the perspective view which showed the vertical full rotation hook of FIG. FIG. 5 is an exploded perspective view showing the vertical full rotary hook of FIG. 4. It is drawing which showed typically the process in which the stitch at the time of carrying out forward sewing using the vertical full rotation hook of FIG. 1 is formed. It is the figure which showed typically the shape and firmness of the conventional perfect stitch and the perfect stitch of this invention.

  Hereinafter, an embodiment of the vertical full rotary hook according to the present invention will be described in detail with reference to FIGS.

  In the following description, one side of the housing is a side adjacent to the power cutting rotation part in the rotation center axis direction of the power cutting rotation part, and the other side of the housing is a power cutting rotation part in the rotation center axis direction of the power cutting rotation part. The side that does not touch.

  FIG. 4 is a sectional view of the vertical full rotary hook of this embodiment.

  4 to 6, the vertical full rotary hook is fixed to a housing 100 coupled to the main body of the sewing machine and the embroidery machine, and a rotation shaft (not shown) provided on the main body of the sewing machine and the embroidery machine. A power transmission rotating portion 200 disposed on one side of the housing 100 so as to be rotatable around a central axis L of the rotating shaft, and a jaw portion 140 formed at the center of the inner peripheral surface of the housing 100. Power that is built in the housing 100 so as to be rotatable in a state in which the surface facing the other side of the housing 100 abuts, and extends in the other side of the housing 100 to be formed in the power transmission rotating unit 200. A hook body 300 that rotates upon the transmission protrusion 210 and a female mold portion fitted into a male mold portion 120 formed on a part of the inner peripheral surface of the other side portion of the housing 100. A bobbin case base 700 inserted into the hook body 300 in one direction on the other side of the housing 100 so as not to be rotatable with respect to the hook body 300; A bobbin 400 inscribed in a rotatable manner, a cover 500 attached to the bobbin case base 700 so as to be inscribed in the bobbin case base 700 and circumscribed by the bobbin 400, and an inner side of the housing 100 A hook body detachment preventing ring 600 that is rotatably circumscribed by the hook body 300 while being fixedly inscribed in a peripheral surface to prevent the hook body 300 from being detached in one direction of the housing 100; In addition, the needle thread 36 is attached to the bobbin case base 700 while being inscribed in the other inner peripheral surface of the housing 100. A bobbin case base that is rotatably circumscribed with a gap that can pass through and is fixed in contact with the hook body 300 to prevent the bobbin case base 700 from being detached in the other direction of the housing 100. A separation prevention ring 800 is included.

  Accordingly, the bobbin case base detachment preventing ring 800, the hook body 300, and the power transmission rotating part 200 are all rotated about the rotation axis L.

  Further, the housing 100 is formed with a hole 110 formed in a part around it so that a needle 35 that reciprocates up and down along a moving path perpendicular to the rotation axis L can enter. Yes.

  The hook body 300 is formed with a hook portion 310 having a tapered shape on the outer side with an empty space communicating with the hole 110 on the downstream side in the rotation direction. The hook portion 310 is formed of the power transmission rotation portion. By the rotation of 200, the needle thread 36 of the needle 35 that has entered the front of the hook portion 310 via the hole 110 is captured.

  The vertical full rotary hook constructed in this manner is fed with the cloths to be sewn in a state of being stacked on the through hole 110 in FIG. The needle thread 36 is captured by a hook portion 310 that is rotated by the rotation of the power transmission rotating portion 200, and the one-side guide of the hook body 300 is passed through a gap between the bobbin case base 700 and the bobbin case base separation prevention ring 800. The bobbin case base 700 is guided along the outer peripheral surface 320 and passed through the bobbin case base 700, wound around the bobbin thread 34, and stitches are formed on the through holes 110 in FIG.

  FIG. 7 is a drawing schematically showing a stitch formation process when two cloths are forwardly stitched using the vertical full rotary hook.

  The needle thread 36 is supplied through a balance (not shown) above, and the insertion hole of the needle 35 is inserted from the other side of the housing 100 (front surface in FIG. 7) to one side of the housing 100 (back surface in FIG. 7). It is led to the upper surface of the upper fabric. The bobbin thread 34 is led out by the bobbin case base 700, guided to the other side of the housing 100 from the movement path of the hook portion 310, and is guided to the bottom surface of the lower cloth.

  As shown on the leftmost side of FIG. 7, when the needle 35 that is reciprocated up and down comes down, the hook portion 310 that is rotationally driven is disposed on the other side of the housing 100 from the needle 35. Before the bobbin thread 34, the hook part 310 is captured while passing through the loop of the needle thread 36 on the upstream side in the rotational direction, and further formed while the needle thread loop is taken. The supply side yarn portion 36 a of the yarn 36 is guided to the lower side of the hook body 300 on the other side of the housing 100 and the lower side of the bobbin case base 700, and the stitch side yarn portion 36 b of the needle yarn 36 is the one side guide outer peripheral surface of the hook body 300. As shown in the second left side of FIG. 7, the supply side thread portion 36a of the needle thread 36 turns around the bobbin chamber 34 and is guided to one side 720 of the bobbin case base 700. , The needle thread loop is shaped such that the yarn over against the bobbin case base 700.

  As the needle thread loop passes over the bobbin case base 700, the balance pulls the supply side thread portion 36a of the needle thread 36 upward so that the needle thread loop becomes small, as shown on the second right side of FIG. As described above, the needle thread 36 is entangled and pinched by the bobbin thread 34. By further raising the balance, as shown on the rightmost side of FIG. 7, the bobbin thread 34 and the needle thread 36 are engaged so as to be wound around the seam of each cloth, thereby forming a stitch. . By repeating such a process of forming a series of stitches, the two fabrics are sewn by a series of completed stitches 38.

  Therefore, in the vertical full rotary hook, the supply side thread portion 36a of the needle thread 36 rotates around the bobbin thread 34 and the needle thread loop passes over, so that the completed stitch becomes a lock stitch and the quality of the sewing product is uniform. The effect that it is can be obtained.

  Further, according to the present invention, as shown in the rightmost side of FIG. 7, when viewed from the traveling direction in which the bobbin thread 34 is stitched, the needle thread 36 surrounds the bobbin thread 34 from the downstream side to the upstream side. Ring-shaped stitches that cannot be opened alternately are formed, and there are portions of needle threads 36 that cover the bobbin chamber 3 threads 4 directly above the respective stitches. As shown in the right side of FIG. 8, either one of the needle thread 36 and the bobbin thread 34 breaks or the needle 34 is not able to break out between the loops of the needle thread 36. If the thread 36 is pulled in a tension state, the complete stitch cannot be released.

DESCRIPTION OF SYMBOLS 100 Housing 120 Male part 150 Jaw part 200 Power transmission rotation part 210 Power transmission protrusion 300 Hook body 400 Bobbin 500 Cover 600 Detachment prevention ring 700 Bobbin case base 710 Female part

Claims (4)

A housing 100 that is a fixed body, a hook body 300 that is rotatably incorporated in the housing 100 so as to be rotated around a rotation axis that is perpendicular to a moving path of a reciprocating needle, and the hook body A bobbin case base 700 inserted into the hook body 300 in a non-rotatable manner with respect to 300, and a bobbin 400 detachably mounted on the bobbin case base 700 and wound with a bobbin thread 34;
The hook body 300 includes a hook portion 310, and
The hook portion 310 is disposed on the other side of the housing 100 with respect to the needle 35, and is captured while passing through the loop of the needle yarn 36 on the upstream side in the rotational direction of the hook portion 310 before the bobbin yarn 34, 36. A vertical full rotary hook characterized in that the supply side string portion 36a of the 36 rotates around the bobbin thread 34 so that the needle thread loop passes over the bobbin case base 700. The hook body 300 is rotatably circumscribed by the hook body 300 while being fixedly inscribed on one inner peripheral surface of the housing 100 to prevent the hook body 300 from being detached in one direction of the housing 100. The hook body detachment preventing ring 600 and the outer periphery of the housing 100 are fixedly inscribed, and the outer periphery of the bobbin case base 700 is rotatable with a gap through which the needle thread 36 can pass. The bobbin case base disengagement ring 800 further includes a bobbin case base disengagement prevention ring 800 that is fixed in contact with the hook body 300 to prevent the bobbin case base 700 from disengaging in the other direction of the housing 100. Item 2. The full vertical rotary hook according to item 1.   A stitch is formed by using the needle thread of a needle that is provided in a sewing machine or an embroidery machine and the bobbin thread that is provided in a vertical full rotary hook, but when viewed from the traveling direction in which the bobbin thread is stitched, A stitch characterized in that the needle thread surrounds the bobbin thread from the downstream side to the upstream side to form a ring-shaped stitch in a staggered manner. In a method of stitching to a stitching object using a needle thread entangled in a needle thread bobbin provided in a sewing machine or an embroidery machine and a bobbin case base bobbin thread built in a vertical full rotary hook,
When the needle reciprocated up and down comes down, the needle thread loops through the bobbin chamber and is caught while taking the needle thread loop to form larger,
A stage in which the supply thread portion of the needle thread rotates around the bobbin thread and the loop of the needle thread passes over the bobbin case base;
Pulling the supply side thread portion of the needle thread 36 upward so that the needle thread loop is small, so that the needle thread is entangled with the bobbin thread;
A stitching method comprising: further pulling up a supply thread portion of the needle yarn and engaging the bobbin yarn and the needle yarn so as to be wound around the seam of the stitch object.

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