JP2637058C - - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a half-turn kettle provided in a household sewing machine, an industrial sewing machine, and the like used for sewing a cloth. 2. Description of the Related Art FIG. 10 is a side view showing a typical prior art half-turn kettle 1, and FIG. 11 is a plan view showing a half hook 3 provided in the half-turn kettle 1. As shown in FIG. The half hook 3 provided in the half-turn kettle 1 has a bottom 23 on which the studs 22 are erected, and a peripheral edge 24 connected to the bottom 23. A sword tip 25 is formed on the peripheral portion 24, and thread guide projections 26a and 26b are formed radially inward of the sword tip 25. A needle drop groove 26c into which the needle 14 is inserted is formed between the thread guide projections 26a and 26b. The sword tip 25 includes a center line L 1 of the movement path of the needle 14 and an axis L 2 of the intermediate hook 3.
Is disposed closer to the bottom 23 of the inner kettle 3 than one plane perpendicular to. This sword point 25
Is formed in a tapered shape from one end 3a to the other end 3b of the middle furnace 3 toward the open end of the middle furnace 3 so as to approach the one plane, that is, from right to left in FIG. You. The needle 14 is wound around the bobbin 6 in the direction of the axis L <b> 2 of the inner hook 3, and the bobbin thread outlet 20 which guides the bobbin thread 5 stored in the bobbin case 7 to the cloth.
It is reciprocated up and down between the tip 2 and the blade point 25 and inserted into the needle drop groove 26c. FIG. 12 is a front view showing the half-turn kettle 1. The half-turn kettle 1 is supported by a rail 2 fitted into a rail groove formed on the inner peripheral surface of a large kettle (not shown). The bobbin case 7 is integrally formed with a rotation preventing member 7a, and an insertion hole serving as the bobbin thread outlet 202 is formed at a tip portion thereof. The detent member 7a is fitted into a fitting recess of a middle hook retainer (not shown), and the bobbin case 7 is rotated by half rotation of the middle hook 3.
Is prevented from rotating. A driver 4 for oscillatingly driving the inner hook 3 is coaxially fixed to a lower shaft of a sewing machine (not shown) and is driven to rotate half a rotation about the axis L2. [0005] In the half-turn kettle 1 driven half-turn in this way, the needle thread 15 provided by the needle 14 reciprocated up and down as shown by arrows B1 and B2 causes the needle thread 15 to move up and down. The sword tip 25 of the middle hook 3 driven half-rotation synchronously is caught by the sword tip 25 at a position closer to the bottom 23 of the middle hook 3 than the needle 14, and the middle hook 3 is marked with an arrow A1.
The needle thread loop is guided to the position 15a below the bobbin case 7 by making a half turn in the direction. This needle thread loop is formed with the thread guide projections 26a, 2
6b, slides along the guide surface 17 and moves in the direction of the arrow 18, and moves on the outer peripheral surface of the bobbin case 7 by a lifting operation of a balance (not shown) provided in the sewing machine main body.
As the balance is raised, the needle thread 15 slides over the outer peripheral surface of the bobbin case 7 and passes over the thread. The needle thread 15 pulled up by the balance in this way is engaged with the bobbin thread 5 pulled out from the bobbin 6 in the bobbin case 7 to form a stitch. FIG. 13 is a view schematically showing a process of forming a stitch when two cloths 19 and 20 to be sewn are fed in a forward direction. When each of the cloths 19 and 20 is forward-forwarded, that is, when the blade point 25 is fed in the direction opposite to the movement direction when the needle point 25 captures the needle thread 15 as shown by the arrow C1, the needle thread 15 is shown in FIG. As described above, the sword tip 25 captures the sword tip 25 closer to the bottom 23 of the hook 3 than the needle 14. The needle thread 15 captured by the sword tip 25 forms a needle thread loop, and is wound around the bobbin case 7 while being gradually widened, so that the needle thread 15 is moved to the position 15a below the bobbin case 7 shown in FIG. Be guided. From this state, as described above, the supply side tension portion 15b of the needle thread loop is pulled up by the balance as shown by the arrow D, and as shown in FIG.
The bobbin case 7 is passed over the thread as shown in 3 (2). The needle thread loop passing through the bobbin case 7 in this manner becomes smaller as shown in FIG. 12 (3) by further pulling up the supply-side tension portion 15b, and the needle thread 15 winds the bobbin thread 5. Thus, one stitch is formed. Further, when the needle thread 15 moves from the blade point 25 to the outer peripheral surface of the bobbin case 7, the intermediate hook 3 rotates in the direction of the arrow A2 in the reverse direction, returns to the initial position (the state shown in FIG. 12), and again. The needle 4 is driven by the driver 4 in the direction of the arrow A1 to catch the needle thread 15 brought near the blade tip 25 by the downward movement of the needle 14 in the direction of the arrow B1, thereby forming a needle thread loop. By repeating such a series of operations, continuous stitches are formed as shown in FIG. [0007] In such a conventional technique, the two cloths 19 and 20 to be sewn are reversely fed, that is, the needle thread 15 is moved by the blade point 25 indicated by the arrow C2 in FIG. When sent in the same direction as the moving direction of the blade point 25 when the sword is captured, the entangled stitch 27 shown in FIG.
Is formed. FIG. 14 is a diagram schematically illustrating a seam forming process when the cloths 19 and 20 are reversely fed. The needle thread 15 provided by the needle 14 is captured by the blade point 25 as shown in FIG. At this time, the bobbin thread 5 pulled out from the bobbin 6 housed in the bobbin case 7 is flowing with respect to the needle 14 in the feed direction indicated by the arrow C2. From this state, the needle thread 15 passes over the bobbin case 7 as shown in FIG. 14 (2) by the rotation of the inner hook 3 and the above-described pulling operation by the balance as described above. At this time, the supply thread 15a passes through the open end side of the bobbin case 7 in the supply side stretch portion 15b, and the stitch side stretch portion 15c is in the bobbin case 7 in the bobbin case 7.
And passes over the yarn. As described above, the bobbin thread 5 is
20 in the feed direction C2, and as shown in FIG.
As shown in FIG. 14 (2), the needle thread 15 disposed closer to the bottom portion 23 of the inner hook 3 moves the bobbin case 7 from the seam-side tension portion 15c toward the supply-side tension portion 15b.
The bobbin 6 passes through the lower side of the bobbin case and is wound under the bobbin case 7, passes through the bobbin case 7 near the open end of the hook 3, and is stored in the bobbin case 7.
The bobbin thread 5 wound around is wound around once and is stretched to the above-mentioned balance. [0008] As the lifting operation by the balance proceeds from this state, the needle thread loop formed by the needle thread 15 becomes smaller as shown in FIG. 14 (3), and the needle thread 15 makes one round of the bobbin thread 5. It is stretched like so. From this state, the needle thread 15 is further
Is pulled up, as shown in FIG. 14 (4), the needle thread 15 is stretched around the bobbin thread 5 near the two cloths 19 and 20 to be sewn. From this state, the needle thread 15 is further pulled up by the balance, and FIG.
As shown in (1), the loop of the needle thread 15 is further reduced, the slack of the needle thread 15 disappears, and the bobbin thread 5 is wound around one turn. In this way, the cloths 19 and 20 to be sewn are reversely fed in the direction indicated by the arrow C2, whereby the entangled stitches 27 are formed. The engagement of the needle thread 15 and the bobbin thread 5 is repeated by the operation of the needle 14 and the intermediate hook 3 as described above, and the seam in which the entangled seam 27 is formed as shown in FIG. It is formed continuously. If the normal stitches and the entangled stitches 27 are mixed in the continuous stitches, the linearity of the stitches is disturbed, and the thread tightness at the entangled stitches 27 occurs, resulting in poor sewing product quality. Is significantly impaired. Therefore, an object of the present invention is to form a normal seam without forming a entangled seam, regardless of whether the cloth to be sewn is fed forward or backward. Is to provide a rotating bite. [0012] The present invention provides a driver that swings around an axis perpendicular to a movement path of a needle that is moved up and down while a needle thread is inserted, and a driver that is coaxial with the driver. About 180 in the circumferential direction
A bobbin case that is provided at a shifted position and that is driven clockwise as viewed from the open end when the needle thread loop is captured by the blade of the driver due to the swing of the driver, a bobbin case detachably mounted on the bobbin, A bobbin housed in a case and around which a bobbin thread is wound, and a half-turn kettle in which the middle hook is formed with a sword tip for catching a needle thread supplied by a needle; Is disposed closer to the open end of the middle furnace than one plane perpendicular to the axis of the middle furnace, and in a direction approaching the one plane from one circumferential end to the other end of the middle furnace. It is formed in a clockwise direction when viewed from the open end side, and the tip of the blade point is up to a half turn characterized by being disposed between the outlet of the bobbin thread and the movement path of the needle. According to the present invention, the cloth can be sewn with continuous normal stitches without entangled seams in any direction, regardless of the feed direction of the cloth to be sewn. FIG. 1 is a side view showing a half-turn kettle 70 according to an embodiment of the present invention, and FIG. 2 is a plan view of a half-kettle 50 provided in the half-turn kettle 70. 3 is a front view of the middle hook 50, and FIG. 4 is an enlarged perspective view showing the vicinity of the sword 56 of the middle hook 50 as viewed obliquely from the upper left of FIG. The inner hook 50 has a bottom 52 on which the stud 51 is erected, and a peripheral edge 53 connected to the bottom 52. A rail 58 extending in the circumferential direction from one end 54 of the inner hook 50 to the other end 55 is formed on the peripheral edge 53, and a sword tip 56 is formed at the other end 55, and the sword tip 56 is located near the sword tip 56. A thread guide projection 57 is formed on the inner side in the radial direction. The sword point 56 is connected to the rail 58, and moves from the one end 54 to the other end 55.
It extends clockwise as viewed from the open end side of the inner hook 50, and is formed in a tapered shape in the clockwise direction toward the bottom 52 side of the inner hook 50 in the direction of the axis L4. In other words, the sword point 56 includes the center line L3 of the movement path of the needle 59, and is disposed closer to the open end of the middle hook 50 than one plane perpendicular to the axis L4 of the middle hook 50, and from the one end 54 As it approaches the other end 55, it is tapered so as to approach the one plane.
The needle 59 is located at a position on the bottom 52 side of the intermediate hook 50 with respect to the sword tip 56, and the arrows E1, E2
It is reciprocated up and down in the direction. The blade point 56 captures the needle thread 77 (shown in FIG. 5 and the like) provided by the needle 59 between the bobbin thread 61 wound around the bobbin 60 and the needle 59. Further, a recess 63 is formed in the sword tip 56 so as to be continuous with the tip 62 and to be retracted from the tip 62 to the open end side of the inner hook 3. Due to this recess 63, after the point 56 has captured the needle thread provided by the needle 59, the point 56 and the needle 59 move when the needle 59 is raised upward as shown by the arrow E1. Interference can be prevented. The bobbin 60 wound with the bobbin thread 61 is housed therein, and the bobbin case 71 mounted on the inner hook 50 has an insertion hole 203 serving as an outlet of the bobbin thread 61 which forms a seam in association with the needle thread 77. The insertion hole 203 is positioned between the tip 62 of the
0 is provided near the open end. FIG. 5 is a front view showing the half-turn kettle 70, FIG. 6 is an exploded perspective view of the half-turn kettle 70 and the driver 72, and FIG. 7 is an overall perspective view of the half-turn kettle 70. . Below the needle plate provided on the sewing machine bed (not shown), a half-turn kettle 70 including the middle hook 50 is arranged. The half-turn kettle 70 has a rail 58 fitted in a rail groove formed on the inner peripheral surface of a large kettle (not shown) to support the middle hook 50, and is erected on a bottom 52 of the middle hook 50. A bobbin case 71 is mounted on the stud 51, and a bobbin 60 around which the bobbin thread 61 is wound is stored in the bobbin case 71. A driver 72 is disposed on the opposite side of the center pin 50 about 180 ° in the circumferential direction with respect to the axis L4. A mounting portion 74 of the driver 72 connected to the driver main body 73 is fixed to a lower shaft 75 of the sewing machine. When the sewing operation is started, the lower shaft 75 is driven to reciprocate a half turn in the directions of arrows F1 and F2 around the axis L4, and the needle 59 interlocked with the lower shaft 75 is driven by the center hook 50 and the driver 72. The needle hole 7 is reciprocated up and down in synchronization with the needle hole 7 formed in the needle plate.
The needle thread 77 is provided near the sword point 56 of the middle hook 50 via 6. A detent member 71a is formed integrally with the bobbin case 71, and the detent member 71a is fitted into a fitting recess of a middle hook retainer (not shown), and is associated with a half rotation operation of the middle hook 50. The rotation of the bobbin case 71 is prevented. Further, the bobbin thread 61 wound around the bobbin 60 housed in the bobbin case 71 is elastically pressed by a bobbin thread tension spring 79 provided on an outer peripheral surface 78 of the bobbin case 71, and the dent prevention is performed. It is guided to the needle hole 76 through a bobbin thread insertion hole 203 provided in the member 71a. The driver 72 is driven to reciprocate by half a rotation in the directions of arrows F1 and F2 by the half-rotation of the lower shaft 75. When the driver 72 rotates in the direction of the arrow F1, one end 80 of the driver 72 comes into contact with the contact surface 86 formed on the one end 54 of the inner hook 50 and presses the same in the same direction. Is rotated halfway in the direction of arrow F1 in a state where the rotation is stopped. The driver 72 has an arrow F
When the driver 72 is rotated in two directions, the other end 81 of the driver 72 is
When the bobbin case 71 is prevented from rotating by contact with the inner surface 83 of the concave portion 82 formed between the thread guide protrusion 57 and the bobbin case 71, the inner hook 50 is turned in the direction opposite to the rotation direction F1. It is driven half a rotation in the direction of an arrow F2. With the above configuration, when the inner hook 50 is driven by the driver 72 to make a half turn in the arrow F1 direction, as shown in FIGS. 5 and 7, the needle thread 77 caught by the blade 56 A thread loop is formed, and the needle thread 77 is guided by the peripheral portion 53 of the inner hook 50, the needle thread loop is expanded and wound around the bobbin case 71, and the tip 62 of the blade tip 56 is connected to the axis L4 and the needle 59. In the vicinity of a position reaching one plane including the center line L3, the needle thread 77 is moved from within the recess 82 along the thread guide surface 84 as shown in FIG.
Is guided in the direction indicated by the arrow G, and passes along the outer peripheral surface 78 of the bobbin case 71. When the needle thread 77 moves on the outer peripheral surface 78 of the bobbin case 71, the center hook 50 is reversed in the arrow F2 direction and returns to the initial position. Needle thread 77 by such a kneader 50
Is repeated, and at the same time, as shown in FIG. 7, a cloth to be sewn (not shown) is fed, for example, in the H direction, whereby seams are continuously formed. FIG. 8 shows the use of a half-turn kettle 70 according to the invention, with two cloths 87,
It is a figure which shows typically the formation process of the stitch when sewing 88. As shown by the arrow H, at the time of forward feeding in which two cloths 87, 88 to be sewn are sent in a direction substantially opposite to the moving direction of the sword 56 when the needle thread 77 is captured by the sword 56. As shown in FIG. 8A, the blade tip 56 captures a needle thread 77 that is brought by the needle 59 passing through each of the cloths 87 and 88. At this time, the sword tip 56 catches the needle thread 77 between the needle 59 and the bobbin thread 61 wound around the bobbin 60 housed in the bobbin case 71 in the axial direction of the inner hook 50. The needle thread 77 captured by the sword 56 forms a needle thread loop as shown in FIG. 8B by rotating the inner hook 50 in the direction of the arrow F 1, and the lower part of the bobbin case 71. It is spread toward. The expanded needle thread loop is
The seam-side stretched portion 89, which is stretched so as to wind the wire 1 and is continuous with the previous seam, passes through the open end of the hook 50 in the bobbin case 71, and is passed through the balance to the spool. The continuous supply-side stretch portion 90 is stretched through the bottom 52 of the hook 50 in the bobbin case 71. From such a state, the needle thread 77 is guided to the state shown in FIG. 5 described above by the inner hook 50, and the supply-side tension portion 8 is moved in the arrow J direction by the operation of the balance.
When the needle 9 is pulled up, the needle thread loop passes over the bobbin case 71 as shown in FIG. When the needle thread loop passes over the bobbin case 71 in this manner, the needle thread 77 passes through the open end side of the hook 50 of the bobbin thread 61 so that the stitch-side stretched portion 89 passes through the supply side tension The frame portion 90 is wound around the bottom 52 of the hook 50 in the bobbin thread 61. In this state, the needle thread 77 is further pulled up by the balance to reduce the needle thread loop, and as shown in FIG. 8 (4), the bobbin thread is formed near the joint between the two cloths 87 and 88. 61 and the needle thread 77 are engaged so as to be wound around each other to form a stitch. By repeating such a series of seam forming processes, FIG.
Normal stitches are continuously formed as shown in (5), and two cloths 87 and 88 are sewn. FIG. 9 shows two cloths 87 by reverse feed using a half-turn kettle 70 according to the invention.
, 88 schematically show a process of forming a stitch when sewing. As shown by the arrow K, when the two tips 87 and 88 to be sewn are sent by the blade tip 56 in the same direction as the direction of movement of the blade tip 56 when catching the needle thread 77, the reverse feed is performed. As shown in FIG. 9 (1), the sword tip 56 captures the needle thread 77 caused by the needle 59 passing through the cloths 87, 88. At this time, the sword tip 56 captures the needle thread 77 between the bobbin thread 61 wound around the bobbin 60 accommodated in the bobbin case 71 and the needle 59 in the axial direction of the inner hook 50. The needle thread 77 captured in this way is the
Is rotated in the F1 direction to form a needle thread loop, and the bobbin case 7
1 is spread downward. At this time, the seam side tension portion 89 of the needle thread loop is
The supply-side stretching portion 90 passes through the open end side of the bobbin case 71 in the bobbin case 71, passes through the bottom 52 side of the bobbin case 71 in the bobbin case 71, and is stretched so as to be wound around the bobbin case 71. You. From this state, the inner hook 50 is further rotated to dispose the inner hook 50 at a position as shown in FIG. 5, and the supply-side stretching portion 90 is pulled up in the J direction by the balance as described above. This allows the bobbin case 71 to pass over the thread. In this way, the needle thread loop passing through the thread is such that the supply-side tension portion 90 passes through the bottom 52 of the bobbin thread 61 and the stitch-side tension portion 89 of the bobbin thread 61. It is stretched so as to pass through the open end side and be wound around the bobbin thread 61. At this time, when the supply-side tension portion 90 passes through the bottom 52 side of the middle hook 50 of the bobbin case 71 and passes over the yarn, the supply-side tension portion 15B passes through the open end side of the middle hook 3 in the related art. Unlike the technology, the bobbin thread 61 does not interfere with the bobbin case 71.
Can be moved to the open end side of the inner hook 50. Thereby, the needle thread 77
The above-described entangled stitch 27 is not formed with the bobbin thread 61, and is simply wound. In this state, the supply side tension portion 90 is further pulled up by the balance, so that the needle thread loop is reduced, and as shown in FIG.
, 88, a normal clean stitch can be formed so that the needle thread 77 and the bobbin thread 61 are engaged with each other. By repeating such a stitch forming process, a continuous stitch as shown in FIG. 9 (5) is formed. As described above, by using the half-turn kettle 70 according to the present invention, after the needle thread loop passes over the bobbin case 71, the supply-side tension portion 90 moves without being disturbed by the bobbin thread 61. Can be engaged by simply winding the needle thread 77 on the bobbin thread 61, and the two cloths 87 and 88 to be sewn are forward-forwarded.
Or, even if sent by reverse feed, a clean normal seam can be formed. Therefore, it is possible to prevent the occurrence of entangled stitches in the process of forming the stitches, so that a sewn product with improved quality can be obtained. In the above-described embodiment, the half-turn kettle 70 rotates the needle thread 77 while rotating in the arrow F1 direction clockwise when viewed from the open end side of the middle hook 50 as in a typical prior art. Without changing the main parts such as the drive of the conventionally used half-turn sewing machine, just by changing some parts including the half-turn kettle,
The object of the present invention can be achieved. As described above, according to the present invention, in a half-turn kettle, the point of the sword includes the center line of the movement path of the needle, and is more than the one that is perpendicular to the axis of the hook. The tip of the sword is formed in a direction approaching the plane from one end in the circumferential direction of the inner hook toward the other end and clockwise as viewed from the open end. Is disposed between the exit of the bobbin thread and the movement path of the needle. In this way, in both cases where the cloth to be sewn is forward-fed and reverse-fed, the main part such as the drive of the conventionally used half-turn sewing machine is simply changed to include the half-turn kettle without changing the main parts. By simply changing the parts, it is possible to form continuous normal seams without forming entangled seams in the seam forming process. Therefore, a beautifully sewn product with improved quality can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing a half turntable 70 of one embodiment of the present invention. FIG. 2 is a plan view showing a middle hook 50 provided in the half-turn hook 70. FIG. FIG. 3 is a front view of the inside hook 50. FIG. FIG. 4 is a perspective view showing the vicinity of a sword point 56 formed in the inner hook 50 as viewed from diagonally upper left in FIG. FIG. 5 is a front view showing a half-turn kettle 70; FIG. 6 is an exploded perspective view showing the half turntable 70 and a driver 72. FIG. 7 is an overall perspective view showing the half-turn kettle 70. FIG. 8 is a view schematically showing a process of forming stitches when sewing two cloths 87 and 88 by forward feeding using a half-turning kettle 70, and FIG. 8 (1) to FIG. ) Shows each forming process of the seam. FIG. 9 is a view schematically showing a process of forming stitches when sewing two cloths 87 and 88 by reverse feed using a half-turning kettle 70, and FIGS. 9 (1) to 9 (5). ) Shows each forming process of the seam. FIG. 10 is a side view showing a typical prior art half hook 3. FIG. 11 is a plan view showing the hook 3; FIG. 12 is a front view showing a half-turn kettle 1; FIG. 13 is a view schematically showing a forming process in which a seam is formed by forward feeding using a half-turn kettle 1 of the prior art, and FIG. 13 (1) to FIG. 3 shows a formation process. FIG. 14 is a view schematically showing a forming process in which a seam is formed by reverse feed using the half-turn kettle 1 of the prior art, and FIG. 14 (1) to FIG. 3 shows a formation process. [Description of Signs] 50 Middle Hook 54 One End of Middle Hook 50 55 Other End of Middle Hook 50 56 Sword Point 58 Rail 59 Needle 60 Bobbin 61 Bobbin Thread 62 Tip of Sword Tip 56 70 Half-turn Hook 71 Bobbin Case 72 Driver 77 Needle Thread 203 Exit of bobbin thread 61 L3 Center line of movement path of needle 59 L4 Axis of middle hook 50

Claims (1)

Claims: 1. A driver that swings around an axis perpendicular to a movement path of a needle that is moved up and down while a needle thread is inserted, and a driver that is coaxial with the driver and has a circumferential direction. About 1
A bobbin case which is provided at a position deviated by 80 ° and which is driven clockwise as viewed from the open end side when the needle thread loop is captured by the blade of the driver by swinging of the driver, A bobbin housed in a bobbin case and around which a bobbin thread is wound, and a half-turn kettle in which the middle hook is formed with a blade tip for catching a needle thread supplied by a needle, It is disposed closer to the open end of the inner kettle than one plane including the center line of the path and perpendicular to the axis of the inner kettle, in a direction approaching the one plane from one end in the circumferential direction of the inner kettle to the other end. A half-turn kettle characterized in that it is formed in a clockwise direction as viewed from the open end side, and the tip of this point is disposed between a bobbin thread outlet and a needle movement path.