JP2004154554A - Sewing machine and lower thread supply equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sewing machine and a lower thread supply equipment which can supply a lower thread into a bobbin case without twisting it around the bobbin, use it, decrease not only the length of the lower thread to twist it around the bobbin and hold it but also replacement of the lower thread remarkably, and produce efficiently. <P>SOLUTION: In a sewing machine, lower thread supply equipment provides a perforation formed in a lower section rather than a section formed by a needle location aperture of a rotating hook. A lower thread guide member whose one end is fixed on the perforation so that it does not obstruct the rotation of a rotating hook, whose other end is locked on a hook which catches a needle thread of the rotating hook, which can get the lower thread through the inside arranged at an upper part of the rotation hook so that it can guide the needle thread located in an upper part of the hook to the lateral surface of the bobbin case sequentially is provided. A lower thread supply hole which passes through the inside of this lower thread guide member, guides the lower thread from the bobbin guided into the rotating hook to the bobbin case, and is formed in the bobbin case is provided. <P>COPYRIGHT: (C)2004,JPO

Description

  The present invention relates to a sewing machine such as a full-rotation type industrial sewing machine and a lower thread supply device of the sewing machine.

  2. Description of the Related Art Conventionally, a bobbin thread of a full-rotation type industrial sewing machine is wound around a bobbin stored in a bobbin case detachably mounted on an inner hook, and can be pulled out from a bobbin thread drawout hole of the bobbin case.

Since the bobbin thread of the conventional full-rotation type industrial sewing machine is used by being wound around the bobbin, the length of the bobbin thread wound around the bobbin is limited.When performing long sewing, the bobbin thread needs to be replaced during the sewing. In addition to the necessity, the lower thread needs to be replaced relatively frequently even if sewing is not performed for a long time, resulting in poor working efficiency.
Patent No. 2972965

  The present invention has been made in view of the above-described drawbacks of the related art, so that the lower thread can be supplied to the bobbin case and used without being wound around the bobbin. The present invention is not limited to this, and an object of the present invention is to provide a sewing machine and a sewing machine lower thread supply device capable of performing sewing work efficiently by remarkably reducing a lower thread replacement operation.

The above and other objects and novel features of the present invention will become more completely apparent when the following description is read in conjunction with the accompanying drawings.
However, the drawings are merely for explanation and do not limit the technical scope of the present invention.

  In order to achieve the above object, the present invention provides an outer hook having a blade point for catching an upper thread fixed to a rotatable hook shaft on a frame that is rotationally driven by a driving device, and an outer hook inside the outer hook. An inner hook attached to a frame housed so as not to hinder the rotation of the outer hook and having a needle drop hole formed at an upper portion into which a sewing needle is inserted, the upper needle being non-rotatably locked by an inner hook stopping member; In a sewing machine having a bobbin case having a lower thread pull-out hole non-rotatably mounted in the inner hook, a through-hole formed at a downstream portion of the inner hook where a needle drop hole is formed; An introduction part whose one end is connected and fixed to the through hole so as not to hinder the rotation of the outer kettle, and whose other end sequentially projects outward from the outer end of the inner kettle on the downstream side. A bent portion leading from the protruding end to an upper position of the outer hook; A guide portion disposed inside the outer hook so as to be arcuate from an end portion of the portion and protruding outward from the outer end of the inner hook from the upstream portion of the needle drop hole in the upstream direction. A lower thread guide member capable of passing a lower thread through the interior consisting of: and a lower thread that passes through the lower thread guide member and guides a lower thread from a bobbin guided into the inner hook into the bobbin case. A lower thread supply hole formed in the bobbin case; and a needle drop hole in a downstream direction at a portion of the lower thread guide member that protrudes outward from an upstream portion of the needle drop hole and an outer end of the inner shuttle. And a needle thread pushing piece for guiding one of the upper threads formed at a portion of the outer hook opposite to the sword tip outwardly from the upstream portion of the lower thread guide member. And a lower thread supply device.

  In addition, the present invention also has a through hole formed at a downstream portion of the inner pot where the needle drop hole is formed, and one end connected and fixed to the through hole so as not to hinder rotation of the outer pot. An introduction portion whose end sequentially projects outward from the outer end of the inner hook on the downstream side, a bent portion leading from the protruding end of the introduction portion to an upper position of the outer hook, an end portion of the bent portion The inner portion of the outer shuttle and the guide portion arranged to protrude outward from the outer end of the inner shuttle from the upstream portion of the needle drop hole in the upstream direction so as to be more arc-shaped. A lower thread guide member that allows the lower thread to pass therethrough; and a bobbin case formed in the bobbin case that guides the lower thread from the bobbin that passes through the lower thread guide member and is guided into the inner hook into the bobbin case. A lower thread supply hole, an upstream portion of the needle drop hole of the lower thread guide member, and an outer side of the inner shuttle. A locking piece protruding downstream in a direction downstream of the needle drop hole at a portion protruding outward from the portion, and one of an upper thread formed at a portion of the outer hook opposite to the sword tip as the lower thread The lower thread supply device of the sewing machine is constituted by the upper thread pushing piece that is guided outward from the upstream portion of the guide member.

  As is clear from the above description, the following effects can be obtained in the present invention.

(1) An outer hook having a blade point for catching an upper thread fixed to a rotatable hook shaft on a frame which is rotationally driven by a driving device, and the outer hook is not prevented from rotating in the outer hook. An inner hook with a needle drop hole formed on the upper part, which is attached to the frame accommodated in such a manner that the sewing needle is inserted into the upper part and is locked by the inner hook stopping member so that the sewing needle cannot be rotated. In a sewing machine having a bobbin case having an attached lower thread pull-out hole, a through-hole formed at a portion downstream of a portion of the inner shuttle where a needle drop hole is formed, and does not hinder rotation of the outer shuttle. One end portion is connected and fixed to the through hole, and the other end portion sequentially projects outward from the outer end portion of the inner kettle on the downstream side. Bend leading to the upper position, arc-shaped from the end of the bend The lower thread is passed through the inside of the outer hook and a guide portion disposed so as to protrude outward from the outer end of the inner hook from the upstream portion of the needle drop hole in the upstream direction. A bobbin thread formed on the bobbin case, the bobbin case being configured to guide a bobbin thread from a bobbin guided through the bobbin case into the bobbin case through the bobbin case. A hole, a locking piece protruding downstream from the needle drop hole to a portion of the lower thread guide member that protrudes outward from an upstream portion of the needle drop hole and an outer end of the inner shuttle. Since the lower thread supply device including the upper thread pushing piece for guiding one of the upper threads formed on the opposite side of the blade point of the outer hook from the upstream portion of the lower thread guide member is provided, The bobbin thread is guided from the bobbin thread guide member into the inner hook, and It can be guided into the bobbin case. Therefore, the bobbin thread can be guided directly from the bobbin into the bobbin case, and can be supplied without being limited to the length in which the bobbin thread is wound around the bobbin as in the related art. Sewing work can be performed efficiently.

(2) According to the above (1), when the upper thread is inserted into the needle drop hole by the sewing needle, the upper thread is captured by the sword tip that captures the upper thread of the outer shuttle, and rotates the outer peripheral portion of the inner shuttle. The upper upper thread located above the sword tip of the upper thread captured by the sword tip is guided by the lower thread guide member so as to be discharged to the outside of the bobbin case, and the lower upper thread located at the lower part of the sword tip is the same as in the past. By rotating the outer periphery of the inner hook, a loop of the upper thread can be formed.
Therefore, a loop of the upper thread is formed as in the related art, and sewing can be performed.

(3) According to the above (1), it is only necessary to provide the lower thread guide member, the through hole formed in the inner hook, and the lower thread supply hole formed in the bobbin case. it can.

(4) Claims 2, 3, 4, and 5 also provide the same effects as (1) to (3).

  Hereinafter, the present invention will be described in detail with reference to the best mode for carrying out the invention shown in the drawings.

In the first preferred embodiment for carrying out the present invention shown in FIGS. 1 to 16, reference numeral 1 denotes a full-rotation industrial sewing machine of the present invention, and the full-rotation industrial sewing machine 1 is fixed to a frame 2. And a driving device rotatably supported by the frame 2 so as to be positioned below the sewing machine main body 4 attached to the machine base 3 and the sewing needle 6 attached to the needle bar 5 of the sewing machine main body 4. An outer hook 10 having a blade tip 9 for capturing an upper thread 8 fixed to the hook shaft 7 and driven to rotate by a (not shown), and a rotation of the outer hook 10 inside the outer hook 10 is not prevented. A stored inner hook 13 which is non-rotatably locked by an inner hook stopping member 11 attached to the frame 2 and which has a needle drop hole 12 formed thereon for inserting a sewing needle 6 therethrough; 13 has a lower thread drawing hole 14 non-rotatably mounted therein. The same structure as that of the related art including the bobbin case 15 and a portion outside the rail 16 at a portion downstream of the portion where the needle drop hole 12 of the inner hook 13 is formed. In the embodiment of the present invention, the open end portion 13 a A through hole 17 formed at a downstream portion of approximately 90 degrees closer thereto, one end of which is fixed to communicate with the through hole 17 so as not to hinder the rotation of the outer hook 10, and the other end of which is connected to the outer hook. The upper portion of the outer hook 10 so that the upper thread 8a, which is locked on the sword tip 9 and catches the upper thread 8 of the sword 10, can be sequentially guided to the outer side of the bobbin case 15. A cylindrical lower thread guide member 19 through which the lower thread 18 can pass through the inside attached to the frame 2 so as to be located inward; Below the bobbin 20 which is led into the 13 18 leading to the bobbin case 15, formed in the bobbin case 15, and a lower thread supply device 22 comprising a lower thread supply holes 21..
In the best mode for carrying out the present invention, the through hole 17 is formed in the inner pot 13 at a downstream position of approximately 90 degrees closer to the opening end 13a than the portion where the needle drop hole 12 is formed. Although the present invention has been described, the present invention is not limited to this, and the through hole 17 may be formed at a downstream portion of the inner pot 13 near the needle drop hole 12.

  As shown in FIGS. 7 and 8, the lower thread guide member 19 has an arc-shaped guide portion 19a to which a portion near a rear end portion is attached to the frame 2 with a pipe material, and is integrally formed at a front end portion of the guide portion 19a. And an introduction portion 19b whose front end is inclined downward sequentially.

  In the sewing machine 1 having the above configuration, the lower thread 18 passes through the lower thread guide member 19 from the bobbin 20 provided on the frame 2 of the sewing machine 1 or the periphery of the sewing machine 1, and supplies the lower thread of the inner shuttle 13 and the bobbin case 15. After passing through the hole 21 and winding the bobbin case 15 through the bobbin case 15 through the bobbin 23 or directly around the bobbin drawer hole 14 or the bobbin 23 housed in the bobbin case 15, the bobbin case 15 It is set so that it can be pulled out from the lower thread drawing hole 14.

When the needle thread 8 of the sewing needle 6 is inserted into the needle drop hole 12, the needle point 9 for catching the needle thread of the rotating outer hook 10 captures the needle thread 8 as shown in FIGS. .
The upper upper thread 8a located above the sword tip 9 of the upper thread 8 captured by the sword tip 9 that captures the upper thread is guided by the guide portion 19a of the lower thread guide member 19 by the rotation of the outer hook 10, and the bobbin case It is discharged to the outside of 15.
Further, the lower needle 8b located at the lower part of the sword tip 9 is guided by the rotation of the outer shuttle 10 to the inner part of the inner shuttle 13 as in the conventional case, and the outer shuttle 10 is moved by the needle as shown in FIGS. By rotating 180 degrees or more from the hole 12, it is positioned on the front and back sides of the outer periphery of the inner pot 13, and rises along the outer periphery of the inner pot 13 as shown in FIGS. 15 and 16. The upper thread loop 24 is formed.
For this reason, the upper upper thread 8a of the upper thread 8 captured by the sword tip 9 that captures the upper thread is guided by the guide portion 19a of the lower thread guide member 19, is discharged to the outside of the bobbin case 15, and is positioned below the sword tip 9. Since the located lower upper thread 8b passes between the outer shuttle 10 and the inner shuttle 13 without passing through the lower thread guide member 19, a loop 24 of the upper thread can be formed as in the related art.
(Different modes for carrying out the invention)

  Next, different modes for carrying out the present invention shown in FIGS. 17 to 33 will be described. In the description of the different embodiments for carrying out the present invention, the same components as those in the first preferred embodiment for carrying out the present invention are denoted by the same reference numerals, and redundant description will be omitted. I do.

  In the second embodiment for carrying out the present invention shown in FIGS. 17 to 21, the main difference from the first embodiment for carrying out the present invention is that The notch grooves 25 and 26 into which the lower thread 18 can be inserted from the outside are formed in the holes 17 and the lower thread guide member 19, and the through hole 17 and the lower thread guide member having the notch grooves 25 and 26 formed therein. Even with the sewing machine 1A using the lower thread supply device 22A using the same 19, the same operational effects as those of the first best mode for carrying out the present invention can be obtained.

The third embodiment for carrying out the present invention shown in FIGS. 22 to 33 is different from the first embodiment for carrying out the present invention mainly in that a needle drop hole 12 of an inner pot 13 is provided. One end is connected and fixed to the through hole 17 so as not to hinder the rotation of the outer hook 10 and the other end is sequentially connected to the inner hole on the downstream side so as not to hinder the rotation of the outer hook 10. An introduction portion 19a protruding outward from the outer end of the shuttle 13, a bent portion 19b guided from the projecting end of the introduction portion 19a to an upper position of the outer hook 10, and an arc shape from an end portion of the bent portion 19b. And a guide portion 19c disposed so as to protrude outward from the outer end of the inner hook 13 from the upstream portion of the needle drop hole 12 in the outer hook 10 and in the upstream direction. A lower thread guide member 19A that allows the lower thread to pass therethrough; A lower thread supply hole 21 formed in the bobbin case 15, which guides the lower thread 18 from the bobbin 20 guided into the inner shuttle 13 into the bobbin case 15 through the inside of the lower thread guide member 19A; An engagement piece projecting downstream from the needle drop hole 12 to the downstream portion of the needle drop hole 12 at the upstream portion of the needle drop hole 12 of the lower thread guide member 19A and at a portion protruding outward from the outer end of the inner shuttle 13. A lower thread comprising: an upper thread extruding piece 27 for guiding one of the upper threads 8 formed at a portion of the outer hook 10 opposite to the sword tip 9 outside the upstream portion of the lower thread guide member 19A. In the sewing machine 1B using the lower thread supplying device 22B configured as described above, the lower thread 18 of the sewing machine 1B uses the lower thread 18 from the bobbin 20 installed on the frame 2 of the sewing machine 1 or the periphery of the sewing machine 1. After passing through the guide member 19A, the inner pot 1 The bobbin case 15 passes through the lower thread supply hole 21 and is passed through the bobbin case 15 through the bobbin 23 or directly into the lower thread pullout hole 14 of the bobbin case 15 or the bobbin 23 stored in the bobbin case 15 several times. After winding, the bobbin case 15 is set so as to be pulled out from the lower thread drawing hole 14.
Further, when the upper thread 8 of the sewing needle 6 is inserted into the needle drop hole 12, the upper thread 8 is captured by the sword tip 9 that captures the upper thread of the rotating outer hook 10.
The upper upper thread 8a, which is located above the sword tip 9 of the upper thread 8 captured by the sword tip 9 that captures the upper thread, is guided by the guide portion 19c of the lower thread guide member 19A by the rotation of the outer shuttle 10, and the bobbin case It is discharged to the outside of 15.
Further, the upper thread 8b located at the lower part of the blade point 9 is pushed by the rotation of the outer hook 10 toward the center of the curved portion of the lower thread guide member 19A which is drawn out of the inner hook 13 by the upper thread pushing piece 28.
The upper thread 8b moves to the outside of the locking piece 27 protruding to the downstream portion of the needle drop hole 12 slightly opposite to the center portion of the upper thread pushing piece 28, and the upper thread 8b moves around the outside of the locking piece 27 as a fulcrum. The rotation of the outer hook 10 guides the inside of the inner hook 13 in the same manner as in the prior art, and rotates 180 degrees or more from the needle drop hole 12 so that the outer hook 10 is located on the front and back sides of the outer periphery of the inner hook 13, The shuttle 13 turns around like a rope.
Further, the rotation of the outer hook 10 raises the sewing needle 6 and turns the inner hook 13 in a rope-like manner. The upper thread 8b gradually separates from the inner hook 13 and lowers the locking piece 27 while contracting the loop. Get out of. Then, the lower thread 18 can be entangled with the upper thread 8a waiting at the upper center lower thread lifting section of the inner hook 13 by pulling out the lower thread 18 from the front surface of the bobbin case 15.

  INDUSTRIAL APPLICATION This invention is utilized in the industry which manufactures a sewing machine and a lower thread supply device, and the sewing industry which uses the same.

FIG. 2 is a front view of the first embodiment of the present invention. FIG. 2 is a fragmentary cutaway view of the first embodiment of the present invention. FIG. 2 is a plan view of a main part of the first embodiment of the present invention. FIG. 2 is a front view of a main part of the first embodiment of the present invention. FIG. 2 is a side view of a main part of the first embodiment of the present invention. FIG. 6 is a sectional view taken along line 6-6 in FIG. 3; FIG. 2 is a plan view of the lower thread guide member according to the first embodiment of the present invention. FIG. 2 is a front view of the lower thread guide member according to the first embodiment of the present invention. The top view of the state where the upper thread was caught at the point of the sword. The front view of the state where the upper thread was caught at the point of the sword. The top view of the state where the upper part of the upper thread is guided by the guide member. The front view of the state where the upper part of the upper thread is guided by the guide member. The top view in which the lower part of an upper thread rotates the outer peripheral part of an inner pot with a sword point. The front view in which the lower part of an upper thread rotates the outer peripheral part of an inner pot with a sword point. The top view of the state where the loop of the upper thread was formed. The front view of the state where the loop of the upper thread was formed. FIG. 7 is a front view of a second embodiment of the present invention. The principal part top view of 2nd Embodiment of this invention. The principal part front view of 2nd Embodiment of this invention. The top view of the lower thread guide member of a 2nd embodiment of the present invention. The front view of the lower thread guide member of a 2nd embodiment of the present invention. FIG. 10 is a front view of a third embodiment of the present invention. The principal part top view of 3rd Embodiment of this invention. The principal part front view of 3rd Embodiment of this invention. The top view in the state where the extrusion piece of the outer pot was located above. The top view of the lower thread guide member of a 3rd embodiment of the present invention. The front view of the lower thread guide member of a 3rd embodiment of the present invention. The top view of the state where the upper thread was caught at the point of the sword. The front view of the state where the upper thread was caught at the point of the sword. The top view of operation | movement description of pushing out to the outside with a needle thread pushing piece. The front view of operation | movement description of pushing out to the outside with a needle thread pushing piece. The top view in the state where the upper thread became a loop. The front view of the state where the upper thread became a loop.

Explanation of reference numerals

1, 1A, 1B: sewing machine, 2: frame,
3: Machine stand,
4: Sewing machine body,
5: Needle bar,
6: sewing needle,
7: Hook shaft,
8: Upper thread,
9: Sword point, 10: Outer pot,
11: Inner hook stop member, 12: Needle drop hole,
13: Inner pot, 14: Lower thread drawing hole,
15: Bobbin case, 16: Rail,
17: Through hole, 18: Lower thread,
19, 19A: Lower thread guide member,
19a: introduction part, 19b: bending part,
19c: guide part, 20: pincushion,
21: lower thread supply hole,
22, 22A, 22B: lower thread supply device,
23: Bobbin, 24: Upper thread loop,
25, 26: notched groove, 27: locking piece,
28: Upper thread extruded piece.

Claims (5)

An outer hook having a blade point for catching an upper thread fixed to a rotatable hook shaft in a frame that is rotationally driven by a driving device, and housed in the outer hook so as not to hinder rotation of the outer hook. The inner hook has a needle drop hole formed at the upper part of the upper frame, which is non-rotatably locked by the inner hook stopping member, and is attached to the inner frame. A sewing machine provided with a bobbin case having a lower thread pull-out hole, wherein a through-hole formed in a portion of the inner shuttle downstream of the needle drop hole and one end of the inner shuttle so as not to hinder rotation of the outer shuttle. Part is connected and fixed to the through hole, and the other end part sequentially projects outward from the outer end of the inner pot on the downstream side, from the protruding end of the introduction part to the upper position of the outer pot. Bending part to be guided, so that it becomes more arc-shaped than the end part of this bending part It is possible to pass the lower thread through an inner portion of the shuttle and a guide portion disposed so as to protrude outward from the outer end of the inner shuttle from the upstream portion of the needle drop hole in the upstream direction. A lower thread guide member formed therein, and a lower thread supply hole formed in the bobbin case, which guides a lower thread from a bobbin guided through the inner thread guide member into the inner hook into the bobbin case. A locking piece projecting downstream to a downstream portion of the needle drop hole in an upstream portion of the needle drop hole of the lower thread guide member and a portion protruding outward from an outer end of the inner shuttle; A lower thread supply device comprising an upper thread pushing piece for guiding one of the upper threads formed on the opposite side of the blade point of the outer hook from the upstream portion of the lower thread guide member is provided. Sewing machine. One end is connected and fixed to the through hole formed at a position downstream of the needle drop hole of the inner pot so as not to hinder the rotation of the outer pot, and the other end is successively downstream. An introduction portion protruding outward from the outer end of the inner hook on the side, a bent portion leading from the protruding end of the introduction portion to an upper position of the outer hook, and an arc shape from an end portion of the bent portion. The lower thread is passed through an inner portion of the outer hook and a guide portion disposed so as to protrude outward from an outer end of the inner hook from an upstream portion of the needle drop hole in an upstream direction. A lower thread guide member, and a lower thread supply hole formed in the bobbin case, which guides a lower thread from a bobbin guided through the lower thread guide member into the inner hook into the bobbin case. And an outer side of the upper end of the needle drop hole of the lower thread guide member and an outer end of the inner shuttle. An engaging piece projecting downstream to the needle drop hole at a projecting portion and one of an upper thread formed at a portion of the outer hook opposite to the sword tip from an upstream portion of the lower thread guide member. And an upper thread pushing piece for guiding outward. An outer hook having a blade point for catching an upper thread fixed to a rotatable hook shaft in a frame that is rotationally driven by a driving device, and housed in the outer hook so as not to hinder rotation of the outer hook. An inner hook having a needle drop hole formed at the upper portion thereof, which is non-rotatably locked by an inner hook stopping member, attached to the frame, and a non-rotatably mounted inside the inner hook. A sewing machine provided with a bobbin case having a lower thread pull-out hole, wherein a through-hole formed in a portion of the inner shuttle downstream of the needle drop hole and one end of the inner shuttle so as not to hinder rotation of the outer shuttle. The upper thread located at the upper part of the tip of the outer hook is fixed to the through hole, and the other end is locked to the tip of the outer hook, which catches the upper thread. The upper thread is sequentially guided to the outer surface side of the bobbin case. Inside can be arranged at the top of the outer pot A lower thread guide member that allows a lower thread to pass therethrough; and a bobbin case formed in the bobbin case that guides a lower thread from a bobbin guided through the lower thread guide member into the inner hook into the bobbin case. A lower thread supply device comprising a lower thread supply hole provided in the sewing machine. An outer hook having a blade point for catching an upper thread fixed to a rotatable hook shaft in a frame that is rotationally driven by a driving device, and housed in the outer hook so as not to hinder rotation of the outer hook. An inner hook having a needle drop hole formed at the upper portion thereof, which is non-rotatably locked by an inner hook stopping member, attached to the frame, and a non-rotatably mounted inside the inner hook. A sewing machine provided with a bobbin case having a lower thread pull-out hole, a through-hole formed in a portion of the inner shuttle near the opening end downstream of a portion in which the needle drop hole is formed, and rotation of the outer shuttle. One end is fixed to the through hole so as not to interfere with the upper end of the bobbin case. Of the outer pot so that it can be guided to the outer side A cylindrical lower thread guide member that allows the lower thread to pass through the interior attached to the frame so as to be located in the inner side direction, and passes through the interior of the lower thread guide member into the inner shuttle. A sewing machine, comprising: a lower thread supply device configured to guide a lower thread from a guided bobbin into the bobbin case and a lower thread supply hole formed in the bobbin case. One end is fixed to the through hole formed at a position downstream of the portion where the needle drop hole of the inner pot is formed, and one end is fixed to the through hole so as not to hinder the rotation of the outer pot. The inner thread disposed on the upper part of the outer hook is lowered so that the upper thread, which is locked on the point of the sword, which is locked on the point of the sword, can be sequentially guided to the outer side of the bobbin case. A lower thread guide member that allows a thread to pass therethrough; and a bobbin case formed in the bobbin case that guides a lower thread from a bobbin guided through the lower thread guide member into the inner hook into the bobbin case. A lower thread supply device for a sewing machine, comprising a lower thread supply hole.

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