Sewing machine

Abstract

To bring an interval of two sewing needles closer in a two needle sewing machine using a half-rotary shuttle.SOLUTION: A sewing machine includes: a needle bar reciprocating in the vertical direction while holding a sewing needle on which a needle thread is laid; a needle plate arranged below the needle bar, and having a needle hole in which the sewing needle is inserted; a shuttle arranged below the needle plate, and supplying a bobbin thread; and a thread cutter for cutting the needle thread and the bobbin thread in a state where the sewing needle is arranged above the needle plate. The thread cutter includes: a fixed knife fixed on a lower surface of the needle plate; and a movable knife rotatable between a stand-by position and an advance position around a pivot provided on the lower surface of the needle plate. The movable knife includes a handling part which enters a needle thread loop formed below the needle hole by rotating toward the advance position, and which divides the needle thread loop into a needle side portion and a seam side portion. The handling part enters the needle thread loop in such a manner that the needle side portion is arranged further outside in the radial direction of the pivot than the seam side portion and the bobbin thread.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The technology disclosed in this specification relates to a sewing machine. [Background technology]

[0002] BACKGROUND ART In the technical field of sewing machines, a sewing machine with a thread cutting device as disclosed in Patent Document 1 is known. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-236280 Summary of the Invention [Problem to be solved by the invention]

[0004] A sewing machine's thread cutting device has a fixed knife and a movable knife. To cut the upper and lower threads, the upper and lower threads extending downward from the needle hole in the needle plate are hooked onto the movable knife. The movable knife, which has the upper and lower threads hooked, rotates toward the fixed knife, thereby cutting the upper and lower threads. In a sewing machine thread cutting device using a semi-rotating shuttle like the one described in Patent Document 1, when the bobbin case containing a bobbin with a wound bobbin thread and the shuttle are viewed from the left (front) of FIG. 1, the movable knife operates from the front as shown in FIGS. 7(a) to 8(e), entering the loop of the upper thread and then turning back to cut the upper and lower threads. Therefore, space is required in front of the shuttle to accommodate the movable knife and the fixed knife. In a two-needle sewing machine with opposing semi-rotating shuttles, the movable knife and the fixed knife must be located between the shuttles, preventing the two shuttles from being close to each other. This inevitably makes it difficult to bring the two sewing machine needles closer together.

[0005] The technology disclosed in this specification aims to reduce the distance between two sewing needles in a two-needle sewing machine that uses a semi-rotating shuttle. [Means for solving the problem]

[0006] This specification discloses a sewing machine. The sewing machine includes a needle bar that holds a sewing needle with an upper thread threaded therethrough and moves back and forth vertically; a needle plate that is positioned below the needle bar and has a needle eye through which the sewing needle is inserted; a shuttle that is positioned below the needle plate and supplies bobbin thread; and a thread cutting device that cuts the upper and bobbin threads when the sewing needle is positioned above the needle plate. The thread cutting device includes a fixed knife fixed to the underside of the needle plate and a movable knife that is rotatable between a standby position and an advanced position around a pivot provided on the underside of the needle plate. The movable knife has a separating part that, when rotated toward the advanced position, enters an upper thread loop formed below the needle eye and separates the upper thread loop into a needle-side portion and a seam-side portion. The separating part enters the upper thread loop so that the needle-side portion is positioned radially outward of the pivot relative to the seam-side portion and the bobbin thread. [Effects of the Invention]

[0007] According to the technology disclosed in this specification, the distance between the two sewing needles can be reduced in a twin-needle sewing machine using a semi-rotary shuttle. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing a sewing machine according to an embodiment. [Figure 2] FIG. 2 is a diagram illustrating the operation of the semi-rotary hook according to the embodiment. [Figure 3] FIG. 3 is a diagram illustrating the operation of the semi-rotary hook according to the embodiment. [Figure 4] FIG. 4 is a diagram illustrating the operation of the semi-rotary hook according to the embodiment. [Figure 5] FIG. 5 is a diagram illustrating the operation of the semi-rotary hook according to the embodiment. [Figure 6] FIG. 6 is a perspective view of the thread cutting device according to the embodiment, seen from above. [Figure 7] FIG. 7 is a view of the thread cutting device according to the embodiment as seen from the right side. [Figure 8]FIG. 8 is a view of the thread cutting device according to the embodiment as seen from below. [Figure 9] FIG. 9 is a perspective view of the movable knife according to the embodiment as seen from above. [Figure 10] FIG. 10 is a diagram showing the operation of the movable knife according to the embodiment. [Figure 11] FIG. 11 is a perspective view illustrating the operation of the movable knife according to the embodiment. [Figure 12] FIG. 12 is a view of the thread cutting device according to the embodiment as seen from below. [Figure 13] FIG. 13 is a view of the thread cutting device according to the embodiment as seen from below. [Figure 14] FIG. 14 is a view of the thread cutting device according to the embodiment as seen from below. [Figure 15] FIG. 15 is a diagram illustrating the effect of the thread cutting device according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment will be described with reference to the drawings. In the embodiment, the positional relationship of each part will be described using the terms left, right, front, rear, top, and bottom. These terms indicate relative positions or directions based on the operator operating the sewing machine 1.

[0010] [sewing machine] 1 is a perspective view showing a sewing machine 1 according to an embodiment. In this embodiment, the sewing machine 1 is an industrial sewing machine. The sewing machine 1 is a two-needle, half-rotary hook lockstitch sewing machine. The sewing machine 1 includes a sewing machine frame 3, a needle bar 5, a thread take-up lever 6, a needle plate 7, and a presser foot 8.

[0011] The sewing machine frame 3 is installed on the upper surface of the sewing machine table 2. An operator operates the sewing machine 1 in front of the sewing machine table 2.

[0012] The needle bar 5 holds the sewing machine needle 4 on which the upper thread 50 is threaded and moves back and forth in the vertical direction. The needle bar 5 is supported by the sewing machine frame 3. Two sewing machine needles 4 are provided. The needle bar 5 holds the two sewing machine needles 4. The two sewing machine needles 4 are arranged in the front-to-back direction. The sewing machine needle 4 has a threading hole 4A through which the upper thread 50 passes. The sewing machine needle 4 holds the upper thread 50 on the inner surface of the threading hole 4A. As the needle bar 5 moves back and forth in the vertical direction, the sewing machine needle 4 moves back and forth in the vertical direction while holding the upper thread 50.

[0013] The take-up lever 6 supplies the upper thread 50 to the sewing machine needle 4. The take-up lever 6 moves back and forth in the vertical direction. The take-up lever 6 is supported by the sewing machine frame 3. The take-up lever 6 moves back and forth in the vertical direction while holding the upper thread 50. The take-up lever 6 has a holding hole through which the upper thread 50 passes. The take-up lever 6 holds the upper thread 50 on the inner surface of the holding hole. By moving back and forth in the vertical direction, the take-up lever 6 pays out and pulls up the upper thread 50 used to sew the fabric 100.

[0014] The needle plate 7 supports the fabric 100 from below. The needle plate 7 is positioned below the needle bar 5. The needle plate 7 faces the sewing machine needle 4 held by the needle bar 5. Two needle plates 7 are provided to correspond to the two sewing machine needles 4. The two needle plates 7 are positioned in the front-to-back direction. The needle plate 7 has a needle hole 7A through which the sewing machine needle 4 is inserted. The sewing machine needle 4 that has penetrated the fabric 100 supported by the needle plate 7 is inserted into the needle hole 7A.

[0015] The presser foot 8 presses down the fabric 100 supported by the needle plate 7 from above. The presser foot 8 is arranged at least partially around the sewing needle 4. Two presser foot 8 are provided to correspond to the two sewing needles 4. The two presser foot 8 are arranged in the front-to-back direction. The presser foot 8 is supported by the sewing machine frame 3. The presser foot 8 is movable in the up-and-down direction, as well as in the front-to-back and left-to-right directions.

[0016] The sewing machine 1 also has a feed device that moves the fabric 100 in the front-to-back and left-to-right directions. The feed device includes a lower plate (not shown) that holds the fabric 100 and a presser foot 8. The lower plate is disposed below the fabric 100, and the presser foot 8 is disposed above the fabric 100. The lower plate holds the fabric 100 from below, and the presser foot 8 holds the fabric 100 from above. The feed device forms predetermined stitches on the fabric 100 by moving the fabric 100 in the front-to-back and left-to-right directions.

[0017] [Half-rotating kettle] Each of Figures 2, 3, 4, and 5 is a diagram illustrating the operation of the semi-rotary shuttle 10 according to the embodiment. Each of Figures 2, 3, 4, and 5 is a diagram of the semi-rotary shuttle 10 as viewed from the front (the operator's side). The sewing machine 1 is equipped with a semi-rotary shuttle 10 that is positioned below the needle plate 7. The semi-rotary shuttle 10 supplies a bobbin thread 60. The semi-rotary shuttle 10 is positioned directly below the sewing machine needle 4. Two semi-rotary shuttles 10 are provided to correspond to the two sewing machine needles 4. The two semi-rotary shuttles 10 are positioned in the front-to-rear direction. The two semi-rotary shuttles 10 are positioned so as to face each other.

[0018] The semi-rotary shuttle 10 has a hook point 10A that catches the upper thread 50 from the lowered sewing machine needle 4. The semi-rotary shuttle 10 houses a bobbin case 11. A bobbin is housed in the bobbin case 11. A lower thread 60 is wound around the bobbin. The semi-rotary shuttle 10 makes approximately a half-rotation reciprocating motion. While the sewing machine needle 4 makes one reciprocating movement up and down, the semi-rotary shuttle 10 makes one reciprocating motion. In the following description, a half rotation of the semi-rotary shuttle 10 in the forward direction will be referred to as an outward rotation, and a half rotation of the semi-rotary shuttle 10 in the reverse direction will be referred to as a return rotation.

[0019] 2, when the sewing machine needle 4 descends and penetrates the fabric 100, a loop of the upper thread 50 is formed below the fabric 100. The semi-rotary shuttle 10 rotates forward so as to hook the loop of the upper thread 50 with the point 10A.

[0020] As shown in Figure 3, as the semi-rotary shuttle 10 rotates forward, the sewing machine needle 4 rises and leaves the fabric 100, creating a larger loop in the upper thread 50. Furthermore, as the semi-rotary shuttle 10 rotates forward, the upper thread 50 moves along the outer periphery of the bobbin case 11. In the following description, the loop of the upper thread 50 formed below the fabric 100 when the sewing machine needle 4 rises and leaves the fabric 100 will be referred to as an upper thread loop 51, as appropriate.

[0021] The upper thread loop 51 is formed so as to extend from the stitch 101 formed in the fabric 100 to the threading eye 4A of the sewing machine needle 4. The upper thread loop 51 includes a needle-side portion 51A between the threading eye 4A and the needle point 10A, and a seam-side portion 51B between the needle point 10A and the stitch 101.

[0022] As shown in FIG. 4, after the semi-rotary shuttle 10 has completed its forward rotation and the upper thread loop 51 has passed the outer periphery of the bobbin case 11, the upper thread 50 is pulled up by the thread take-up lever 6, whereby the upper thread 50 is released from the blade tip 10A and becomes entangled with the bobbin thread 60.

[0023] As shown in Fig. 5, after the upper thread 50 pulls down the bobbin thread 60 by the thread take-up 6, the fabric 100 is moved by the feeding device, thereby forming a stitch on the fabric 100. The operations described with reference to Figs. 2 to 5 are repeated, thereby forming a predetermined stitch on the fabric 100.

[0024] [Thread trimmer] Fig. 6 is a perspective view of the thread cutting device 20 according to the embodiment as seen from above. Fig. 7 is a view of the thread cutting device 20 according to the embodiment as seen from the right. Fig. 8 is a view of the thread cutting device 20 according to the embodiment as seen from below.

[0025] The thread cutting device 20 cuts the upper thread 50 and the bobbin thread 60 when the sewing machine needle 4 is positioned above the needle plate 7. The thread cutting device 20 is positioned below the needle plate 7. The thread cutting device 20 has a fixed knife 21 fixed to the underside of the needle plate 7, a movable knife 22 that is rotatable about a pivot 7B provided on the underside of the needle plate 7, and an elastic member 23 that generates an elastic force that presses the movable knife 22 against the fixed knife 21. The movable knife 22 is positioned below the fixed knife 21. When the movable knife 22 approaches the fixed knife 21 with the upper thread 50 and the bobbin thread 60 hooked on it, the upper thread 50 and the bobbin thread 60 are cut by the blade portion 22F of the movable knife 22 and the blade portion 21B of the fixed knife 21.

[0026] The counter knife 21 has a body portion 21A and a blade portion 21B. The blade portion 21B is provided at the rear end portion of the body portion 21A. The left end portion of the body portion 21A is fixed to the underside of the needle plate 7 by two screws 24.

[0027] The elastic member 23 is a leaf spring provided below the throat plate 7. The elastic member 23 is disposed below the counter knife 21. The left end of the elastic member 23 is fixed to the underside of the throat plate 7 by two screws 24. The screws 24 fix the elastic member 23 and the counter knife 21 to the throat plate 7. The elastic member 23 urges the movable knife 22 toward the throat plate 7.

[0028] 9 is a perspective view of the movable knife 22 according to the embodiment, seen from above. The movable knife 22 has a body portion 22A, a bending portion 22B, and a separating portion 22C.

[0029] The body portion 22A is rotatably supported by the pivot 7B. The rotation axis of the pivot 7B extends in the vertical direction. The pivot 7B protrudes downward from the lower surface of the needle plate 7. The body portion 22A has a rotation hole 22D into which the pivot 7B is inserted. The movable knife 22 is rotatable around the pivot 7B.

[0030] The body portion 22A is connected to an operating lever 26 via a pivot pin 25. The pivot pin 25 is inserted into a pin hole 22L provided in the body portion 22A. The operating lever 26 moves in the front-rear direction by the operation of an actuator (not shown). When the operating lever 26 moves in the front-rear direction, the movable knife 22 rotates around the pivot 7B.

[0031] The bending portion 22B connects the body portion 22A and the separating portion 22C. The separating portion 22C is connected to the body portion 22A via the bending portion 22B.

[0032] The cutting portion 22C has a tip portion 22E, a cutting edge portion 22F adjacent to the tip portion 22E, a first guide portion 22G connected to the tip portion 22E, a second guide portion 22H connected to the tip portion 22E, a first recessed portion 22J connected to the first guide portion 22G, and a second recessed portion 22K connected to the second guide portion 22H. When the radial direction is defined as the direction radially outward from the pivot 7B, the second guide portion 22K is positioned radially outward of the first guide portion 22G.

[0033] FIG. 10 is a diagram illustrating the operation of the movable knife 22 according to the embodiment. As shown in FIG. 10, the movable knife 22 is rotatable between a standby position Pa and an advanced position Pb. The movable knife 22 rotates between the standby position Pa and the advanced position Pb below the fixed knife 21. When the movable knife 22 is positioned at the standby position Pa, a portion of the bending portion 22B and the separating portion 22C of the movable knife 22 is positioned between the elastic member 23 and the fixed knife 21. When the movable knife 22 is positioned at the standby position Pa, the elastic member 23 comes into contact with the lower surface of the movable knife 22. When the movable knife 22 is positioned at the standby position Pa, the elastic member 23 generates an elastic force that presses the movable knife 22 against the fixed knife 21. When the movable knife 22 is positioned at the advanced position Pb, the movable knife 22 is removed from between the fixed knife 21 and the elastic member 23. When the movable knife 22 is positioned at the advanced position Pb, the elastic member 23 faces the lower surface of the fixed knife 21. When the movable knife 22 is disposed at the advanced position Pb, the elastic member 23 may come into contact with the lower surface of the fixed knife 21. When the movable knife 22 is disposed at the advanced position Pb, the elastic member 23 may generate an elastic force that presses the fixed knife 21 against the throat plate 7.

[0034] As described above, the fabric 100 is moved in the left-right direction. The fixed knife 21 and the movable knife 22 disposed at the standby position Pa are each disposed forward of the needle hole 7A.

[0035] As the operating lever 26 moves in the forward and backward directions, the movable knife 22 rotates around the pivot 7B. As the operating lever 26 moves rearward, the movable knife 22 is disposed at the standby position Pa. As the operating lever 26 moves forward, the movable knife 22 is disposed at the advanced position Pb. As the movable knife 22 rotates, the tip 22E passes directly below the needle hole 7A.

[0036] [Operation] Next, an operation of the thread cutting device 20 will be described. Fig. 11 is a perspective view illustrating the operation of the movable knife 22 according to the embodiment. Figs. 12, 13, and 14 are views of the thread cutting device 20 according to the embodiment as seen from below.

[0037] As shown in FIG. 11 , the thread cutting device 20 cuts the upper thread 50 and the bobbin thread 60 when the sewing needle 4 is raised and released from the fabric 100. As described with reference to FIG. 3 , when the sewing needle 4 is raised and released from the fabric 100, an upper thread loop 51 is formed below the fabric 100. Note that the semi-rotary shuttle 10 is not shown in FIG. 11 . The upper thread loop 51 is substantially triangular. The upper thread loop 51 includes a needle-side portion 51A between the sewing needle 4 and the semi-rotary shuttle 10 and a seam-side portion 51B between the semi-rotary shuttle 10 and the seam 101. As shown in FIG. 12 , the needle-side portion 51A is positioned radially outward of the seam-side portion 51B and the bobbin thread 60 in the radial direction of the pivot 7B.

[0038] When cutting the upper thread 50 and the lower thread 60, the movable knife 22 rotates from the standby position Pa toward the advanced position Pb. As shown in Fig. 13, as the movable knife 22 rotates toward the advanced position Pb, the tip 22E of the separating part 22C enters inside the upper thread loop 51. The separating part 22C enters inside the upper thread loop 51 and separates the upper thread loop 51 into a needle-side part 51A and a seam-side part 51B. As shown in Fig. 13, the separating part 22C enters the upper thread loop 51 so that the needle-side part 51A is positioned radially outward of the pivot 7B relative to the seam-side part 51B and the lower thread 60.

[0039] After the blade point 22E has entered the upper thread loop 51, the movable knife 22 further rotates toward the advanced position Pb, causing the seam-side portion 51B and the bobbin thread 60 to contact the first guide portion 22G, and the needle-side portion 51A to contact the second guide portion 22H. The movable knife 22 rotates toward the advanced position Pb in a state in which the seam-side portion 51B and the bobbin thread 60 are in contact with the first guide portion 22G, and the needle-side portion 51A is in contact with the second guide portion 22H.

[0040] 14, when the movable knife 22 rotates toward the advanced position Pb, the seam-side portion 51B and the bobbin thread 60 are positioned near the first recessed portion 22J, and the needle-side portion 51A is positioned in the second recessed portion 22K. In the embodiment, when the movable knife 22 rotates toward the advanced position Pb, the seam-side portion 51B and the bobbin thread 60 are guided by the first guide portion 22G so as to be positioned near the first recessed portion 22J, and the needle-side portion 51A is guided by the second guide portion 22H so as to be positioned in the second recessed portion 22K. The second recessed portion 22K is spaced a fixed distance from the first recessed portion 22J, so as to ensure a fixed length from the threading hole 4A of the sewing machine needle 4 of the needle-side portion 51A of the upper thread 50 that was cut at the seam-side portion 51B.

[0041] When the seam side portion 51B and the bobbin thread 60 are positioned near the first recess 22J, the movable knife 22 rotates from the advanced position Pb toward the standby position Pa, whereby the seam side portion 51B and the bobbin thread 60 are positioned in the first recess 22J, and the seam side portion 51B and the bobbin thread 60 are cut by the blade portion 21B of the fixed knife 21 and the blade portion 22F of the movable knife 22.

[0042] [effect] As described above, according to the embodiment, the separating portion 22C separates the needle thread loop 51 into a needle side portion 51A and a seam side portion 51B. The seam side portion 51B is the portion of the needle thread loop 51 that should be cut. The needle side portion 51A is the portion of the needle thread loop 51 that should not be cut. The separating portion 22C separates the needle thread loop 51 into the needle side portion 51A and the seam side portion 51B so that the needle side portion 51A moves radially outward of the seam side portion 51B. The fixed knife 21 and the movable knife 22 are each positioned approximately to the left of the needle eye 7A.

[0043] FIG. 15 is a diagram illustrating the effect of the thread cutting device 20 according to the embodiment. As shown in FIG. 15, when the sewing machine is a two-needle sewing machine, a pair of needle plates 7 (7L, 7R) is provided on the sewing machine. A thread cutting device 20 is disposed below each of the pair of needle plates 7 (7L, 7R). Two thread cutting devices 20 are provided to correspond to the two sewing machine needles 4. The thread cutting device 20 includes a thread cutting device 20L disposed below the needle plate 7L and a thread cutting device 20R disposed below the needle plate 7R. The thread cutting device 20L has a fixed knife 21L, a movable knife 22L, and an elastic member 23L. The thread cutting device 20R has a fixed knife 21R, a movable knife 22R, and an elastic member 23R. As shown in FIG. 15 , when a pair of needle plates 7 (7L, 7R) are arranged in the front-to-rear direction, the pair of movable knives 22 (22L, 22R) can rotate without interfering with each other or surrounding objects while the distance between the needle hole 7A of the needle plate 7L and the needle hole 7A of the needle plate 7R is shortened. In the needle plate 7L, the counter knife 21L and the movable knife 22L, which is positioned at the standby position Pa, are disposed to the right of the needle hole 7A of the needle plate 7L. In the needle plate 7R, the counter knife 21R and the movable knife 22R, which is positioned at the standby position Pa, are disposed to the left of the needle hole 7A of the needle plate 7R. One thread cutting device 20L is disposed to the right of the needle hole 7A, and the other thread cutting device 20R is disposed to the left of the needle hole 7A. Therefore, the needle hole 7A of one needle plate 7L can be brought closer to the needle hole 7A of the other needle plate 7R while suppressing interference between the thread cutting device 20L and the thread cutting device 20R. In a twin-needle sewing machine, the distance between the pair of needle holes 7A can be shortened. In a twin-needle sewing machine using a semi-rotating shuttle, the distance between the two sewing needles 4 can be shortened. [Explanation of symbols]

[0044] 1...sewing machine, 2...sewing machine table, 3...sewing machine frame, 4...sewing machine needle, 4A...thread hole, 5...needle bar, 6...take-up lever, 7...throat plate, 7A...needle eye, 7B...pivot, 8...pressure foot, 9...thread tension, 10...semi-rotary hook, 10A...tip, 11...bobbin case, 20...thread cutter, 21...fixed knife, 21A...body, 21B...blade, 22...movable knife, 22A...body, 22B...flexion, 22C...separating part, 22D...Pivot hole, 22E...Tip portion, 22F...Blade portion, 22G...First guide portion, 22H...Second guide portion, 22J...First recess, 22K...Second recess, 22L...Pin hole, 23...Elastic member, 24...Screw, 25...Pivot pin, 26...Operating lever, 50...Upper thread, 51...Upper thread loop, 51A...Needle side portion, 51B...Stitch side portion, 60...Lower thread, 100...Fabric, 101...Stitch, Pa...Waiting position, Pb...Advance position.

Claims

1. a needle bar that holds a sewing machine needle with an upper thread wound thereon and moves back and forth in the up and down direction; a needle plate disposed below the needle bar and having a needle hole into which the sewing machine needle is inserted; a hook that is disposed below the needle plate and that supplies a bobbin thread; a thread cutting device that cuts the upper thread and the lower thread while the sewing machine needle is positioned above the needle plate, The thread cutting device a fixed knife fixed to the underside of the needle plate; a movable knife that is rotatable around a pivot provided on the underside of the needle plate between a standby position and an advanced position, The movable knife is a separating portion that, by rotating toward the advanced position, enters into a needle thread loop formed below the needle eye and separates the needle thread loop into a needle-side portion and a seam-side portion; the separating portion enters the upper thread loop so that the needle side portion is positioned radially outward of the pivot relative to the stitch side portion and the bobbin thread; sewing machine.

2. The handling unit includes: a point portion that enters the upper thread loop; a first guide portion connected to the tip portion; a second guide portion connected to the point portion and disposed radially outward of the first guide portion; a first recess connected to the first guide portion; a second recess connected to the second guide portion, the seam side portion and the bobbin thread are guided by the first guide portion so as to be disposed in the first recess; The needle side portion is guided by the second guide portion so as to be disposed in the second recess.

2. The sewing machine according to claim 1.

3. When the movable knife is rotated toward the standby position while the seam side portion and the bobbin thread are disposed in the first recess, the seam side portion and the bobbin thread are cut by the fixed knife and the blade portion of the movable knife.

3. The sewing machine according to claim 2.

4. the fixed knife and the movable knife disposed at the standby position are each disposed to the left of the pinhole; 2. The sewing machine according to claim 1.

5. The thread cutting device an elastic member provided below the needle plate and generating an elastic force that presses the movable knife against the fixed knife; 2. The sewing machine according to claim 1.

6. the movable knife rotates between the standby position and the advanced position below the fixed knife, The elastic member is When the movable knife is disposed at the standby position, the movable knife is pressed against the fixed knife.

6. The sewing machine according to claim 5.

7. The movable knife is a body portion supported by the pivot; A bending portion connecting the body portion and the handling portion.

2. The sewing machine according to claim 1.

8. The kettle is a semi-rotary kettle, The two semi-rotary hooks are provided facing each other, The sewing machine needles are provided in two pieces, Two thread cutting devices are provided.

2. The sewing machine according to claim 1.

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