JP5086730B2 - 1 thread lock sewing hand stitch sewing machine - Google Patents

Description

The present invention relates to a single-thread locked hand-stitch sewing machine , and more particularly, a pseudo-hand stitch called a pinpoint / saddle stitch in which a sewing thread is surely captured by a needle thread catch and a stitch is formed in the space inside the sewing machine bed. The present invention relates to a hand-stitch sewing machine that is suitable for sewing .

  The seam that creates pinpoint stitches that can be seen and hidden alternately on one side of the workpiece with a single thread and that gives the texture of hand-sewing is the international standard ISO 4915 Stitch Type 104 (chain stitch) and It is standardized as ISO 4915 Stitch Type 209 (saddle stitch / hand stitch).

  Conventionally, pinpoint stitching (pseudo hand stitch) on the “104” seam using a sewing needle pierced by a single needle thread, a heel needle with a thread catching side, a looper and a spreader There is known a pinpoint sewing machine that is formed as described above and prevents fabric shift such as star stitching (for example, see Patent Document 1).

  This pinpoint sewing machine has a drawback that the stitch pitch is limited to the interval between the sewing needle and the heel needle because the sewing needle through which one sewing thread is pierced and the heel needle side by side with the thread catching heel are used. is there.

  In addition, in this pinpoint sewing machine, a balloon stitch is formed on the upper side of the cloth at the time of sewing, but the pinpoint stitch that is originally sewn is formed on the lower side of the cloth. Since the sewing work is forced, it is difficult to confirm the pinpoint sewing position, and there is a disadvantage that accurate sewing cannot be performed.

  Further, the “104” stitch in this pinpoint stitching machine can be easily unwound by pulling the sewing thread forming the stitch, and therefore loses the function of preventing the above-described fabric misalignment such as star stitching. There are also drawbacks.

  In order to solve this drawback, one sewing thread wound around a bobbin built in the rotary hook, a needle having a single thread catcher side, a thread hook, a thread guide spreader to the thread catcher, and A pseudo hand stitch sewing machine has been proposed that uses a balance to form a pseudo pinpoint stitch similar to a “104” seam (see, for example, Patent Document 2).

Japanese Patent Publication No. 55-35481 (Figs. 5, 6, and 7) Japanese Patent Publication No. 4-3234 (= U.S. Patent 4,590,878) (FIGS. 11, 13, and 14)

  In this pseudo hand stitch sewing machine, when sewing, double stitched threads are formed in a hand stitch shape on the upper side of the cloth, and lock stitches are formed on the lower side of the cloth. However, in this pseudo hand stitch sewing machine, although the thread guide spreader for the needle thread catcher needs to be arranged between the needle plate supporting the cloth and the rotary hook, the balance is functionally connected to the needle plate. Must be placed between the needle plate and the rotary hook, and a drive mechanism for driving the thread guide spreader must be installed. Could not be realized.

  Moreover, in this pseudo hand stitch sewing machine, the thread threaded into the rotary hook has to be pulled up above the cloth by the thread hook, and the operator can do this on the cloth. It is extremely dangerous to take a hand in a proper position, and there is a problem that it hinders the sewing work for moving the cloth.

  Therefore, it is impossible to carry out this pseudo hand stitch sewing machine.

The present invention has been made to solve such a conventional problem, and the sewing thread is surely captured by the thread capturing rod of the needle, and the seam is formed in the space in the sewing machine bed. An object of the present invention is to provide a single-thread locked hand stitch sewing machine suitable for a pseudo hand stitch called.

  The principle of the present invention is that a thread catching rod is installed on a side and reciprocates linearly in the vertical direction, a rotary hook that rotates fully, a biaser that reciprocates linearly in the horizontal direction, a thread pulling actuator, By cooperating the mechanism and the feed dog that moves in an elliptical manner, the sewing thread is securely captured by the needle thread catch and the stitches are formed in the space inside the sewing machine bed, so that hand stitch stitching is performed on the surface of the workpiece. The purpose is to form lock stitches on the eyes and the back.

In order to achieve this object, the single thread lock hand stitch sewing machine of the present invention is
It descends from the top dead center, penetrates the body to be sewn placed on the needle plate, rises out of the body to be sewn from the bottom dead center, and descends from the top dead center in the first stroke that linearly reciprocates vertically. The thread is caught when it penetrates the sewing body and rises from the bottom dead center, and it is caught when it descends from the top dead center in the second stroke and penetrates the sewing body and rises from the bottom dead center. A side needle with a thread catcher to release the thread,
A rotary hook below the throat plate and wound with a thread, and the thread is pulled out from the thread outlet. When the first stroke is lowered from the top dead center, penetrates the sewing object, and rises from the bottom dead center In addition, the thread is tightened in accordance with the rise of the needle that has captured the thread with the thread catching needle, and the needle is lowered from the top dead center in the second stroke, penetrates the sewing object, and rises from the bottom dead center. The hook has a sword tip that rotates and catches the thread that has been caught by the thread catcher. The thread that has been caught is spun at the sword tip of the hook by the rotation of the hook to release it from the thread catcher. A rotating hook that passes through the hook and crosses the thread wound around the hook by rotating further,
When the heel needle descends from the top dead center in the first stroke and penetrates the sewing object placed on the needle plate and rises from the bottom dead center, the thread is wound under the needle plate and the rotary hook A biasing element that biases the thread pulled out from the thread outlet with the lowering of the hook needle and then returns immediately before the raising of the hook needle to return the thread to the hook needle and capture it with the thread catching hook;
A thread shifting mechanism that pulls the thread before the needle moves down from the top dead center in the second stroke and penetrates the workpiece, tightens the thread that has passed through the hook, and then pulls the loosened thread;
A thread pulling actuator for tightening the thread drawn from the thread outlet by rotating the hook when the thread catching rod catches the thread;
While the heel needle is pulled out of the sewing body in the first stroke and raised and passes the top dead center, the sewing body is fed by the first stitch pitch, and the heel needle is pulled out of the sewing body and raised in the second stroke. While passing through the dead point, it is provided with a feed dog that feeds the workpiece to be pitched by one stitch, whereby hand stitch stitches are formed on the surface of the workpiece, and lock stitches are formed on the back surface.

According to the single-thread locked hand-stitch sewing machine of the present invention, the sewing thread is surely captured by the needle thread catching ridge, and a single-thread locked seam is formed in the space inside the sewing machine bed. Sewing suitable for a pseudo hand stitch called a stitch can be performed.

Furthermore, according to the single thread lock hand stitch sewing machine of the present invention, the hand stitch stitches are formed on the surface of the workpiece, and the lock stitches are formed on the back surface. Sewing work is performed in a state where the eyes can be seen, and the hand stitch sewing position can be confirmed, so that accurate sewing can be performed.

Further, according to the single thread lock hand stitch sewing machine of the present invention, the hand stitch stitches are formed on the surface of the material to be sewn and the lock stitches are formed on the back surface. Since it is not easily unwound by pulling the sewing thread forming the thread, firm sewing can be obtained.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The best mode for carrying out a single-thread locked hand stitch sewing machine of the present invention will be described below with reference to the drawings.

  As shown in FIG. 1 and FIG. 2, the single-stitched hand stitch sewing machine of the present invention has a frame 1 composed of an arm 2 and a bed 3 side by side with a thread catching rod 10a and linearly reciprocates in the vertical direction. A needle 10 for piercing the sewing thread 20 into the body 21 to be sewn, a rotary hook 200 for making a stitch by crossing the sewing thread 20 by rotating in the horizontal direction, and reciprocating linearly in the horizontal direction so that the sewing thread 20 is in contact with the needle 10 When the biasing element 16 to be captured by the thread catching bar 10a and the sewing thread 20 captured by the thread catching bar 13a are in a slack state, the crank movement is performed between the needle tip of the scissors needle 13 and the sewing target, A thread pulling mechanism 600 for pulling the sewing thread 20 with the thread pulling 15, a thread pulling actuator 17 for linearly reciprocating in the horizontal direction to loosen the sewing thread 20 and tightening the seam, and an object to be sewn by moving elliptically. Feed dog 601 for feeding out 21 There is mounted, hand-stitched seam on the surface of the fabric workpiece 21 with one sewing thread 20 wound around the rotary pot 200, a sewing machine to form respectively a JoNui stitches on the back. In the present specification, “circumferential contact” means contact with a certain part. In this specification, “winding” means wearing in a wound state.

  The arm 2 is provided with an upper shaft 5 and the bed 3 is provided with a lower shaft 6 in the horizontal direction. The upper shaft 5 is rotatably mounted on the arm 2 by an upper shaft front metal 51 and an upper shaft rear metal 52 (see FIG. 7), and the lower shaft 6 is a lower shaft front metal 61 and a lower shaft rear metal 62 (see FIG. 7). ) Is rotatably installed on the bed 3.

  A driven pulley 4 is provided at one end of the upper shaft 5 and is driven by a motor M via a drive belt MB that is an endless belt, and a counterweight of a needle driving mechanism 100 that drives the needle 10 at the other end of the upper shaft 5. 101 is provided. Further, a cloth feed mechanism 400 that causes the feed dog 401 to elliptically move via the lower shaft 6 and an upper shaft timing pulley 8 that drives the rotary hook 200 are provided in the vicinity of the driven pulley 4 of the upper shaft 5. A cylindrical cam 501 for driving a biaser / yarn withdrawal actuator drive mechanism 500 that linearly reciprocates the biaser 16 and the thread withdrawal actuator 17 is provided at a position near the upper shaft timing pulley 8 of the upper shaft 5. Yes. Further, a first gear 607A of a bevel gear 607 that drives a yarn shifting mechanism 600 that cranks the yarn feeder 15 is provided between the counterweight 101 of the upper shaft 5 and the cylindrical cam 501.

  The heel needle drive mechanism 100 lowers the heel needle 10 from the top dead center and penetrates the sewing body 21 placed on the throat plate 13, comes out of the sewing body 21 from the bottom dead center, rises, and linearly extends in the vertical direction. When the reciprocating first stroke descends from the top dead center, penetrates the workpiece 21 and rises from the bottom dead center, the sewing thread 20 is captured by the thread catching rod 10a, and the second stroke descends from the top dead center. The sewing thread 20 that has been captured by the thread catching rod 10a can be released when penetrating the workpiece 21 and ascending from the bottom dead center. In this specification, the “first stroke of the needle 10” is the first stitch until the needle 10 reaches the needle top dead center → the needle bottom dead center → the needle top dead center, “the second stroke of the needle 10”. Means that the needle 10 is the second needle from the needle top dead center to the needle bottom dead center to the needle top dead center. A presser foot drive mechanism 300 that operates a presser foot 14 for pressing the sewing object 21 against the throat plate 13 is provided in the vicinity of the heel needle drive mechanism 100.

  During the first stroke, the cloth feed mechanism 400 pulls out the needle 10 from the sewing body 21 and moves it up and passes the top dead center. This is a mechanism configuration in which the workpiece 21 can be pitch-feeded by the feed dog 401 with the feed dog 401 while it is pulled out from the workpiece 21 in the second stroke and is raised and passed through the top dead center. The cloth feed mechanism 400 can feed the workpiece 21 on the heel needle 10 by causing the feed dog 401 to perform a so-called four-step movement of ascending, advancing, descending, and retreating.

  The rotary hook 200 is a hook below the needle plate 13 where the sewing thread 20 is wound and the sewing thread 20 is pulled out from the thread outlet 209a. The rotary hook 200 descends from the top dead center in the first stroke and penetrates the workpiece 21. When the needle thread 10 that has captured the sewing thread 20 with the thread catching rod 10a rises from the bottom dead center, the sewing thread 20 is tightened, and the needle needle 10 is lowered from the top dead center in the second stroke to be sewn. When the needle 21 penetrates the body 21 and ascends from the bottom dead center, the hook rotates the sewing thread 20 that has been caught by the thread catching rod 10a, and the sewing thread 20 that has been caught is rotated by the rotation of the hook. A mechanism configuration in which the hook is released from the thread catching rod 10a by being swung with the hook tip 201a, and the released sewing thread 20 can be inserted into the hook by further rotating the hook and intersect with the sewing thread 20 wound around the hook. It is. The rotary hook 200 configured as described above can be driven by a screw gear 202 that transmits the rotational motion of the lower shaft 6.

  The bias / yarn withdrawal actuator drive mechanism 500 has a mechanism configuration in which the bias 16 is linearly reciprocated in the horizontal direction along the cam groove 501a of the cylindrical cam 501, and the bias 16 is moved upward in the first stroke. When the needle thread descends from the dead point, penetrates the workpiece to be sewn placed on the needle plate 13, and rises from the bottom dead center, the sewing thread 20 is wound under the needle plate 13 and the thread outlet 209a of the rotary hook 200 is wound. The thread 20 pulled out from the tension is biased with the lowering of the heel needle 10 and then returned immediately before the raising of the heel needle 10 so that the sewing thread 20 can be brought into contact with the heel needle 10 and captured by the thread catching bar 10a. To work. A concave portion 16a is formed at the tip of the biasing element 16 so that the sewing thread 20 can be hooked and biased.

  Further, the biasor / yarn withdrawal actuator drive mechanism 500 has a mechanism configuration in which the yarn withdrawal operator 17 is linearly reciprocated in the horizontal direction along the cam groove 501a of the cylindrical cam 501, and the yarn withdrawal operator 17 is moved to the rotary hook. The sewing machine 20 is operated so that the thread 20 pulled out from the thread outlet 209a of the rotary hook 200 can be tightened by the rotation of the 200. The thread pull-out operator 17 hooks the sewing thread 20 drawn from the thread outlet 209a of the rotary hook 200 after the sewing thread 20 caught by the thread catching bar 10a is beaten by the sword tip 201a of the rotary hook 200, and rotates. After the hook 200 is pulled out and tightened, the sewing thread 20 is captured by the thread catching rod 10a, and then the sewn thread 20 that is hooked is released. A thread hooking portion 17a for hooking the sewing thread 20 is formed at the tip of the thread pull-out operating element 17.

  The thread gathering mechanism 600 has a mechanism configuration in which the yarn gathering 15 is crank-moved, and the thread gathering 15 is gathered before the needle 10 descends from the top dead center in the second stroke and penetrates the workpiece. After the sewing thread 20 that has passed through the rotary hook 200 is tightened, the loosened sewing thread 20 can be pulled up. Specifically, as shown in FIG. 3, the tip 15a formed in the L-shape of the yarn feeder 15 is rotated once on the presser foot 14 by the elliptical motion of the movement locus ML while the upper shaft 5 makes one rotation. Thus, the tip portion 15a of the yarn feeder 15 can be elliptically moved without interfering with the needle 10 that moves linearly in the vertical direction. Such a thread shifting mechanism 600 is provided so that when the heel needle 10 descends in the second stroke of the heel needle 10, the thread catching heel 10 a of the heel needle 10 is between the needle tip of the heel needle 10 and the workpiece 21. This is because there is a possibility that the thread 20 in the slack state may be pierced by the needle tip of the lowering needle 10 because the thread 20 that has been trapped in the thread becomes loose from the tensioned state and can be loosened. .

  The single-thread lock sewing hand stitch sewing machine configured in this way has the sewing object 21 of the sewing object 21 in cooperation with the needle 10, the rotary hook 200, the biasing element 16, the thread guide 15, the thread pulling-out actuator 17 and the feed dog 401. A hand stitch stitch is formed on the front surface and a lock stitch is formed on the back surface as a jump stitch set, and the workpiece 21 is fed by the feed dog 401 in the first stroke of the needle 10 to the stitch pitch for the hand stitch stitch, In the second stroke of the heel needle 10, the to-be-sewn body 21 is fed by the feed dog 401 to the pitch between stitches for hand stitch stitches.

  The operation of such a single thread lock hand stitch sewing machine will be described with reference to FIGS. 4A to 4H and FIG. 4 (A) to 4 (H) are operation explanatory views of the needle 10, the rotary hook 200, the deflector 16, the thread guide 15 and the thread pull-out actuator 17, and FIG. 5 is a view illustrating the needle 10, the rotary hook 200, and the thread guide. 15 is a motion diagram of the biasing element 16, the feed dog 401, the lid needle 12, and the thread drawing actuator 17. In addition, about the mechanism structure and operation | movement of the lid needle 12, it abbreviate | omits in this operation | movement description. In the description of the operation, when directions are indicated, the description will be made with FIGS. 4A to 4H viewed from the front. Further, in FIGS. 4A to 4H, the feed dog 401 and the body to be sewn are not shown.

  4A to 4H, for the sake of convenience, the needle tip 201a of the rotary hook 200 is in a state in which the needle 10 where the sewing thread 20 is not caught by the thread catching rod 10a is located at the top dead center. In the figure, the operation will be described from a state (FIG. 4 (A)) which is located above in the vertical direction. In the state of FIG. 4A, the rotary hook 200 is in a stopped state, and the thread pull-out operator 17 moves backward to move the sewing thread 20 through the thread outlet 209a of the rotary hook 200 (moves in the right direction in the figure). In this state, the feed dog 401 is in an inter-stitch feed state, and the biasing element 16 is located at the last retreat point (the rightmost point in the figure). The feeding direction of the sewing object is assumed to be from the near side to the far side.

  In FIG. 5, since the pulley 4 is formed as a jump stitch set by two rotations, one cycle of sewing is shown as 720 degrees in the rotation of the upper shaft 5, and FIG. 4A shows that the upper shaft 5 is 0 degrees. 4B is a state where the upper shaft 5 is 60 degrees, FIG. 4C is a state where the upper shaft 5 is 180 degrees, and FIG. 4D is a state where the upper shaft 5 is 270 degrees. 4E is a state in which the upper shaft 5 is 360 degrees, FIG. 4F is a state in which the upper shaft 5 is 410 degrees, FIG. 4G is a state in which the upper shaft 5 is 540 degrees, and FIG. H) is a state where the upper shaft 5 is 610 degrees. 4I is a detailed operation diagram in FIG. 4B. When the upper axis 5 is 0 degrees, the needle 10 is a top dead center, and when 180 degrees, the needle 10 is a bottom dead center, 360 degrees, the needle 10 is a top dead center, and the needle 10 is a bottom dead center at 540 degrees.

  Further, the sword tip 201a of the rotary hook 200 is set to rotate twice while the upper shaft 5 rotates once. In FIGS. 4A to 4H, the thread catching rod 10a of the rod needle 10 is formed so that the opening portion is directed to the left side.

  In FIG. 1, when the driven pulley 4 driven by the motor M through the driving belt MB rotates in the clockwise direction when viewed from the side of the heel needle 10, the heel needle drive mechanism 100, the cloth feed mechanism 400, and the rotation are rotated by the rotation of the upper shaft 5. The shuttle 200, the biasor / yarn withdrawal actuator driving mechanism 500, and the yarn feeding mechanism 600 are driven. When the hook driving mechanism 100 is driven, the hook 10 is linearly reciprocated in the vertical direction. When the cloth feeding mechanism 400 is driven, the feed dog 401 is moved in four steps. When the rotary hook 200 is driven, the sword tip 201a is rotated and biased. When the child / yarn withdrawal actuator drive mechanism 500 is driven, the biasing element 16 and the yarn withdrawal operator 17 are individually reciprocated linearly in the horizontal direction, and when the yarn feeder mechanism 600 is driven, the yarn feeder 15 is elliptically moved.

  The scissors 10, the feed dog 401, the rotary hook 200, the deflector 16, the thread pull-out actuator 17, and the thread clamp 15 that operate in this way cooperate as follows, and the surface of the workpiece to be sewn with one sewing thread 20. Hand stitch seams and lock stitches on the back.

  (A): The scissors needle 10 that linearly reciprocates in the vertical direction descends from the top dead center (upper shaft 5: 0 degrees) in the first stroke and penetrates the sewing object placed on the needle plate 13 (FIG. 4 ( A) to FIG. 4 (C), FIG. 5), the thread of the rotary hook 200 around which the sewing thread 20 is wound below the needle plate 13 when ascending from the bottom dead center (upper shaft 5: 180 degrees). After the tension of the sewing thread 20 drawn out from the outlet 209a is biased by the biaser 16 with the lowering of the needle 10, the sewing thread 20 is brought into contact with the needle 10 by returning immediately before the raising of the needle 10, and the thread catching needle 10a Capture (FIG. 4D, FIG. 5).

  At this time, the sewing thread 20 pulled out from the thread outlet 209 a of the rotary hook 200 is pulled out by the thread pull-out operator 17. In order to bring the sewing thread 20 into contact with the heel needle 10, as shown in FIGS. 4A and 4B, the heel needle 10 moves from the top dead center to a position where the deflector 16 linearly reciprocates in the horizontal direction. This can be achieved by retracting the sewing thread 20 from a position where the biasing element 16 is most advanced to a position where the sewing needle 20 can be circumferentially contacted before the descent. Further, the thread pull-out operator 17 stops at the most forward position before the heel needle 10 pierces the workpiece 21 (upper shaft 5: 180 degrees) (FIG. 5). The lid needle 12 is opened when the heel needle 10 is pierced into the sewing object 21 (FIG. 5). The feed dog 401 stops the cloth feed of the to-be-sewn body 21 before the heel needle 10 pierces the to-be-sewn body 21 (FIG. 5). Further, the yarn feeder 15 moves leftward from FIG. 4C to FIG. 4D and moves to the left side of the position of the heel needle 10.

  (B): During the first stroke, the needle 10 is pulled out of the sewing body 21 and is lifted to pass the top dead center (upper shaft 5: 360 degrees). The needle 10 that has fed and sewn the sewing thread 20 is pulled up and pulled up (FIGS. 4E and 5).

  At this time, the thread pull-out operator 17 starts retreating and loosening the thread so that the sewing thread 20 can be fed out after the needle 10 reaches the bottom dead center (upper shaft 5: 180 degrees) (FIG. 5). The lid needle 12 is configured such that when the eyelid needle 10 moves from the bottom dead center (upper axis 5: 180 degrees) to the upper dead center (upper axis 5: 360 degrees), The thread catching rod 10a is closed and the sewing body 21 is passed along with the rod needle 10 (FIG. 5). The feed dog 401 starts the 1st stitch pitch feed immediately before the eyelid needle 10 passes through the top dead center (upper shaft 5: 360 degrees) (FIG. 5). The biasing element 16 is retracted to the right retracting position when the hook 10 passes the top dead center (upper shaft 5: 360 degrees) (FIG. 5).

  (C): The sewing thread 20 is pulled up before the needle 10 descends from the top dead center in the second stroke and penetrates the workpiece 21 (FIG. 4 (F), FIG. 5). Specifically, when the heel needle 10 descends from the top dead center in the second stroke, the thread 20 captured by the thread capturing rod 10a is moved between the needle tip of the heel needle 10 and the workpiece 21 and the non-thread capturing rod 10a. Pull the yarn in the opening direction. Thereby, it is possible to prevent the sewing thread 20 captured by the thread catching rod 10a from being detached from the thread catching rod 10a. In addition, since the thread pull-out operator 17 performs thread loosening even when the needle 10 is lowered from the top dead center (upper shaft: 360 degrees), the thread pulling 15 is prevented in order to prevent the sewing thread 20 from loosening and playing. Thus, the sewing thread 20 is gathered.

  At this time, the lid needle 12 keeps the thread catching rod 10a in the closed state because the rod needle 10 has come out of the body to be sewn 21 (FIG. 5). The feed dog 401 stops the first stitch pitch feed before the heel needle 10 penetrates the workpiece 21 (FIG. 5). The biasing element 16 remains retracted to the right retracting position (FIG. 5).

  (D): The needle 10 descends from the top dead center (upper shaft 5: 360 degrees) in the second stroke and penetrates the sewing body 21 (FIGS. 4G and 5), and the bottom dead center (upper shaft 5 : 540 degrees), the sewing thread 20 captured by the thread catching rod 10a is beaten by the sword tip 201a of the rotary hook 200, and the captured sewing thread 20 is rotated from the yarn catching hook 10a by the rotation of the rotary hook 200. Release (FIG. 4 (H), FIG. 5).

  At this time, in the rotary hook 200, when the hook needle 10 reaches the bottom dead center (upper shaft 5: 540 degrees), the sewing thread 20 captured by the thread catching rod 10a immediately before the third rotation is scooped by the sword tip 201a (FIG. 5). ). The thread drawing operation element 17 is still loosened. When the heel needle 10 descends from the top dead center and passes through the sewing body 21, the lid needle 12 opens the thread catching heel 10a of the heel needle 10 (FIG. 5). The feed dog 401 remains stopped (FIG. 5). The biasing element 16 remains retracted to the right retracting position (FIG. 5).

  (E): The sewing thread 20 squeezed and released by the sword tip 201a of the rotary hook 200 is passed through the rotary hook 200 by further rotating the rotary hook 200 and crossed with the sewing thread 20 wound around the rotary hook 200 ( The sewing thread 20 passed through the rotary hook 200 is tightened by the thread pulling actuator 17 (FIG. 4 (H), FIG. 4 (A), FIG. 5).

  At this time, the thread pull-out operator 17 starts to slide so that the sewing thread 20 can be tightened when the heel needle 10 is removed from the workpiece 21, so that the sewing thread 20 pulled out from the rotary hook 200 is thread-drawn. After the thread 17 is tightened, the loosened sewing thread 20 is pulled up (FIG. 5). The lid needle 12 closes the thread catching bar 10a of the barb needle 10 when the barb needle 10 rises from the bottom dead center and passes through the workpiece 21 (FIG. 5). The feed dog 401 starts the pitch feed between the first stitches immediately before the eyelid needle 10 passes through the top dead center (upper shaft 5: 720 degrees) (FIG. 5). The biaser 16 starts to slide in the left direction, which is the direction in which the sewing thread 20 is biased immediately before the barb needle 10 passes through the top dead center (upper shaft 5: 720 degrees) (FIG. 5).

  (F): During the second stroke, the needle 10 is pulled out of the sewing body 21 and is lifted to pass the top dead center (upper shaft 5: 720 degrees). The pitch is fed (FIGS. 4A and 5).

  (G): The steps (a) to (f) are repeated to form hand stitch stitches on the surface of the sewing object 21 and lock stitches on the back surface.

  Therefore, the sewing thread 20 is reliably captured by the thread catching rod 10a of the heel needle 10, and a single thread lock stitch is formed in the space in the sewing machine bed, and sewing suitable for a pseudo hand stitch called a pinpoint / saddle stitch can be performed. . In addition, since hand stitch stitches are formed on the surface of the body to be sewn 21 and lock stitches are formed on the back surface, the sewing operation is performed with the hand stitch stitches visible on the surface for the operator. Since the position can be confirmed, accurate sewing can be performed. In addition, since hand stitch stitches are formed on the surface of the body to be sewn 21 and lock stitches are formed on the back surface, the sewing thread 20 forming a single thread lock stitch is easily unwound. Since there is nothing, strong sewing can be obtained.

  Next, the needle drive mechanism 100, the presser foot drive mechanism 300, the cloth feed mechanism 400, the rotary hook 200, and the biasing / thread pulling-out actuator driving, which are components of the single-thread locked hand stitch sewing machine of the present invention described above. A specific example of the mechanism 500 and the yarn shifting mechanism 600 will be described.

  The heel needle drive mechanism 100 is provided with a lid needle 12 so that the sewing thread 20 captured by the thread catching heel 10a does not come off when the heel needle 10 comes out of the sewing object in the first stroke of the heel needle 10 (hereinafter referred to as “the needle needle 10”). , "Acupuncture needle / lid needle drive mechanism 100").

  As shown in FIGS. 1, 2, 7, 8 (A), (B), and FIG. 9, the needle / lid needle driving mechanism 100 is connected to the arm 2 so that the upper end portion 110 a can be freely rotated by a pin 109. The needle bar 9 is inserted into each hole of the upper needle bar holder 110b and the lower needle bar holder 110c formed in the needle bar frame 110 so that the needle bar 9 can reciprocate linearly in the vertical direction. The needle 10 is fixed together with a needle holder 116 with a needle set screw 117. Further, a needle bar holder 104 is fixed to the needle bar 9 between the upper needle bar holder 110b and the lower needle bar holder 110c, and one end of the needle bar crank rod 103 is rotated in the shaft portion 104a formed on the needle bar holder 104. The other end of the needle bar crank rod 103 is rotatably connected to a counterweight 101 fixed to the other end of the upper shaft 5 by a crank rod pin 102. Accordingly, since the needle bar crank rod 103 performs a crank motion via the counterweight 101 by the rotation of the upper shaft 5, the needle bar 9 on which the needle 10 is fixed by the needle lock 116 is linearly reciprocated vertically by the needle bar holder 104. Exercise.

  Further, the thread catching rod 10 a of the rod needle 10 is opened and closed by the lid needle 12. The lid needle 12 is formed in a lid needle holder 118, and the lid needle holder 118 can linearly reciprocate vertically in each hole of the upper lid needle bar holder 110e and the lower lid needle bar holder 110d formed in the needle bar frame 110. It is being fixed to the lower end part of the lid needle bar 17 inserted in the state. Further, a lid needle driving piece 108 is fixed to the lid needle bar 17 located above the upper lid needle bar holder 110e, and an arm portion 108a of the lid needle driving piece 108 is between the upper needle bar holder 110b and the lower needle bar holder 110c. Is fitted with a gap so as to be movable. Since the arm portion 108a of the lid needle driving piece 108 is located at the upper portion of the needle bar holder 104, when the needle bar holder 104 is lifted together with the heel needle bar 9, the lid needle driving piece 108 is passed through the arm portion 108a. Can also be raised. Further, since the flat portion of the lid needle driving piece 108 is slidably positioned with respect to the flat portion of the needle bar frame 110, the lid needle bar 17 to which the lid needle driving piece 108 is fixed does not rotate. . Therefore, it is possible to prevent the lid needle 12 from being displaced from a position where the yarn catching rod 10a of the rod needle 10 can be closed. Further, a lid needle bar spring hook 112 is fixed to the upper end portion of the lid needle bar 17, and the lid needle bar spring hook 112 is a lid having one end fixed to a lid needle bar spring hook 110 f formed on the needle bar frame 110. Since the other end of the needle bar spring 115 is fixed, the lid needle bar spring hook 112 is always pulled downward.

  As shown in FIG. 8 (A), the needle / lid needle driving mechanism 100 configured as described above is configured such that when the needle bar 9 is raised by the rotation of the upper shaft 5, the needle bar holder 104 is connected to the lid needle driving piece 108 as shown in FIG. Is raised against the elastic force of the lid needle bar spring 115. At this time, the lid needle 12 also rises with the raising of the heel needle 10, so that the thread catching heel 10 a of the heel needle 10 is closed by the lid needle 12, as shown in FIGS. 10A and 11A. That is, the thread catching rod 10a is blocked by the lid needle 12 when the rod needle 10 moves from the bottom dead center to the top dead center. When the needle bar 9 is lowered by the rotation of the upper shaft 5, the needle bar holder 104 is also lowered as shown in FIG. 8B, so that the lid needle driving piece 108 is elasticized by the lid needle bar spring 115. To descend. At this time, since the lid needle 12 is in contact with the upper lid needle bar support 110e of the needle bar frame 110, as shown in FIGS. 10a is in an open state. That is, after the heel needle 10 has penetrated the body to be sewn, the thread catching heel 10 is released from the lid needle 12 below the throat plate 13. Therefore, the heel needle 10 and the lid needle 12 can reciprocate linearly along the movement locus shown in the motion diagram of FIG.

  1, 2, 7, and 12, the presser foot drive mechanism 300 is installed on the arm 2 so that the presser bar 301 can be linearly reciprocated in the vertical direction. A presser foot 302 to which 14 is swingably attached is fixed by a presser set screw 304. A presser pressure adjusting screw 308 is fixed to the upper part of the presser bar 301, and the presser pressure adjusting screw 308 is screwed to the upper part of the arm 2. A presser bar holder 305 is fixed to the presser bar 301, and a presser pressure adjusting spring 307 is fitted between the presser bar holder 305 and the lower surface of the arm 2. The pressing force of the presser foot 14 against the workpiece 21 by the presser pressure adjusting spring 307 can be adjusted by turning the presser pressure adjusting screw 308. Further, in order to raise and lower the presser foot 14, a presser lifting lever 310 that engages with the presser bar holding 305 is rotatably provided on a presser lifting lever shaft 309 fixed to the arm 2. When the presser foot lifting lever 310 is raised, the presser bar holder 305 is raised, and when it is lowered, the presser bar holder 305 is lowered. Accordingly, the presser foot lifting lever 310 is raised to create a space between the presser foot 14 and the throat plate 13, and when the sewing body 21 is placed on the throat plate 13, the presser foot lifting lever 310 is lowered to press the sewing body 21. The object to be sewn 21 can be set on the needle plate 13 by being pressed against the needle plate 13 with the gold 14.

  As shown in FIGS. 1, 2, 13, and 14, the cloth feed mechanism 400 is provided below the needle plate 13, and a feed dog 401 is fixed to one end of the feed base 402. The other end of the feed base 402 is fixed to a feed base connecting shaft 403 that is rotatably connected to the upper end of the horizontal feed arm 404. A horizontal feed shaft 416 is rotatably mounted so that a horizontal feed shaft 416 protrudes below a portion where the feed base connecting shaft 403 of the horizontal feed arm 404 is rotatably connected. A protruding portion of a horizontal feed arm shaft 405 fixed so as to protrude from the bed 3 is rotatably mounted. The feed base connecting shaft 403, the horizontal feed shaft 416, and the horizontal feed arm shaft 405 have the same axial direction as the lower shaft 6.

  One end of the protruding portion of the horizontal feed shaft 416 is rotatably mounted on a horizontal feed shaft drive arm 417a of the horizontal feed bifurcated 417. The horizontal feed fork 417 is formed in a U-shape including an upper arm portion 417b, a lower arm portion 417c, and an arm connection portion 417d that connects the upper arm portion 417b and the lower arm portion 417c, and the upper arm portion 417b of the arm connection portion 417d. A horizontal feed shaft drive arm 417a is formed on the side, and a horizontal feed adjustment arm 417e is formed at the tip of the upper arm portion 417b. Between the upper arm portion 417b and the lower arm portion 417c of the horizontal feed fork 417 thus formed, a horizontal feed cam 420 made of a triangular cam fixed to the middle portion of the lower shaft 6 is fitted so as to be capable of cam operation. ing. A lower shaft timing pulley 204 that is rotated by the upper shaft timing pulley 8 of the upper shaft 5 is fixed to one end of the lower shaft 6. Since the lower shaft timing pulley 204 has the same number of teeth as the upper shaft timing pulley 8, the number of rotations is the same.

  Accordingly, when the lower shaft 6 rotates, the horizontal feed fork 417 is swung up and down by the horizontal feed cam 420, so that the horizontal feed shaft driving arm 417a of the horizontal feed fork 417 reciprocates the horizontal feed shaft 416 in the horizontal direction. Swing. When the horizontal feed shaft 416 reciprocally swings in the horizontal direction, the horizontal feed arm 404 reciprocates horizontally in the horizontal direction around the horizontal feed arm shaft 405, so that the feed dog 401 moves horizontally through the feed base 402. Can be reciprocated.

  Further, a vertical feed cam 414 composed of an eccentric cam is fixed to a portion of the lower shaft 6 in the vicinity where the horizontal feed cam 420 is fixed. Further, a feed height adjusting screw 412 screwed into a substantially central portion of the feed base 402 is fixed to the feed base 402 by a nut 413. The feed height adjusting screw 412 is positioned so that the screw head 412a protrudes below the feed base 402, and comes into contact with the vertical feed cam 414. Further, one end of the feed base spring 408 is fixed to the feed dog 401 side of the feed base 402, and one end of the feed base spring 408 is fixed to a spring hook 410 fixed to the bed 3 located below the feed base 402, The feed dog 401 is always pulled downward via the feed base 402.

  Accordingly, when the lower shaft 6 rotates, the feed base 402 is reciprocally swung in the vertical direction around the feed base connecting shaft 403 via the feed height adjusting screw 412 by the vertical feed cam 414. Can be reciprocated in the vertical direction via the feed base 402.

  In this way, by operating the feed base 402 by the triangular cam motion of the horizontal feed cam 420 and the eccentric cam motion of the vertical feed cam 414, the feed dog 401 fixed to the feed base 402 is raised → advanced → lowered → It is possible to perform a so-called four-step movement of retreating. Accordingly, the feed dog 401 can move in four steps along the movement locus shown in the motion diagram of FIG.

  The cloth feed mechanism 400 configured as described above is provided with a feed amount adjustment mechanism that adjusts the feed amount of the workpiece 21 by the feed dog 401. This feed amount adjustment mechanism is adjusted by a feed stitch adjustment dial 436 provided on the side of the frame 1 where the driven pulley 4 is disposed. The feed adjustment dial 436 is fixed to one end of a feed dial shaft 435 that is rotatably mounted on the bed 3 in the same axial direction as the lower shaft 6, and the other end of the feed dial shaft 435 is a feed comprising an eccentric cam. An eye adjustment cam 434 is fixed. This feed stitch adjustment cam 434 is in contact with the arm end of a feed adjustment arm 425 that adjusts the amount of horizontal reciprocation of the horizontal feed shaft 417a of the horizontal feed bifurcated 417.

  The feed adjusting arm 425 is fixed to a feed adjusting shaft 430 that is rotatably mounted on the bed 3 in the same axial direction as the lower shaft 6 by two bearings 431 and 431. One end of a feed adjustment arm spring 427 is fixed to the arm portion of the feed adjustment arm 425, and the other end of the feed adjustment arm spring 427 is attached to a spring hook 428 fixed to the bed 3 located below the feed adjustment arm 425. The arm end of the feed adjusting arm 425 is always pulled downward.

  A feed adjusting rod 423 having a groove 423a is fixed to one end of the feed adjusting shaft 430. In the groove 423a of the feed adjusting rod 423, a feed adjusting square piece 422 fixed to the horizontal feed adjusting arm 417e of the horizontal feed fork 417 via a square piece shaft 421 is slidably fitted. The groove 423a of the feed adjusting rod 423 is disposed so as to be inclined, and when the feed adjusting dial 436 is rotated, the inclination angle is displaced. Therefore, the feed adjustment that reciprocates linearly in the groove 423a of the feed adjusting rod 423 is performed. The amount of movement of the square piece 422 is displaced. Therefore, since the horizontal reciprocation swing amount by the horizontal feed shaft drive arm 417a of the horizontal feed bifurcated 417 is displaced, the feed amount of the workpiece 21 by the feed dog 401 can be adjusted. It should be noted that, by adjusting the protrusion amount of the feed height adjusting screw 412 by loosening the nut 413 on the feed base 402, the vertical reciprocation swing amount can be adjusted. The amount can be adjusted.

  1, 2, 15, and 16, the rotary hook 200 includes an inner hook 207 that houses a bobbin 212 around which the sewing thread 20 is wound, an inner hook 207 that is rotatably mounted, and a sword tip 201 a. The outer hook 201 having the inner hook 207 and the inner hook presser 213 for stopping the rotation of the inner hook 207 are provided.

  The inner hook 207 has a bobbin case accommodating portion 207a for accommodating the bobbin case 212, and the bobbin case 212 is detachably accommodated in the bobbin case accommodating portion 207a. Further, a thread tension spring 208 and a thread guide plate 209 formed along the curve are overlapped and fixed on the inner side surface of the bobbin case housing portion 207a. A thread outlet 209 a and a thread guide groove 209 b are formed in the thread guide plate 209, and tension is applied to the sewing thread 20 pulled out from the bobbin case 212 by a thread tension spring 208.

  The outer hook 201 is provided with an inner hook accommodating portion 201b for accommodating the inner hook 205 and a hook shaft hole 201c for rotatably inserting the hook shaft 205 fixed to the bed 3 in the vertical direction. The center of rotation of the inner hook accommodating portion 201b and the center of rotation of the hook shaft hole 201c are concentric.

  The intermediate hook presser 213 is fixed in the vicinity of the rotary hook 200 of the bed 3 and abuts against a notch 207b formed in the inner hook 205 so that the inner hook 207 rotates even if the outer hook 201 rotates. Can be prevented. In FIGS. 15 and 16, the outer hook 201 rotates counterclockwise, that is, rotates counterclockwise. Therefore, the inner hook 205 also tries to rotate left together with the outer hook 201, but the notch 207 b is connected to the inner hook presser 213. Since it contacts, rotation of the inner hook 207 can be prevented.

  In order to rotate the outer hook 201 of such a rotary hook 200, the screw gear 202 which converts the rotational motion of the lower shaft 6 in the horizontal direction into the rotational motion in the vertical direction is provided. In the screw gear 202, the first gear 202A is fixed to the other end of the lower shaft 6, the second gear 202B is provided so that the center of rotation is concentric with the mounting boss 201d of the outer hook 201, and the lower shaft 6 is The outer hook 201 can be rotated twice during one rotation. A timing belt TB, which is an endless belt, is wound around the lower shaft timing pulley 204 fixed to one end of the lower shaft 6 and the timing pulley 8 fixed to the upper shaft 5. Note that the tension of the timing belt TB is controlled by a tension roller 206 that is rotatably attached to a portion of the frame 1 that couples the arm 2 and the bed 3 by a tension shaft 203.

  When the upper shaft 5 rotates in the rotary hook 200 having such a configuration, the upper shaft timing pulley 8 rotates through the timing belt TB and the lower shaft timing pulley 204 rotates, so that the lower shaft 6 starts rotating. When the lower shaft 6 rotates, the first gear 202A of the screw gear 202 can fully rotate the second gear 202B of the outer hook 201. Therefore, the rotary hook 200 can rotate the outer hook 201 twice in the horizontal direction in one stroke of the hammer 1 according to the movement locus shown in the motion diagram of FIG. That is, the outer hook 201 rotates twice while the upper shaft 5 rotates once. In the method of forming a single-thread locked hand stitch, (e) the rotary thread 200 is further rotated by passing the sewing thread 20 that has been squeezed and released by the sword tip 201a of the rotary hook 200 into the rotary hook 200. When the sewing thread 20 wound around the hook 200 is interlaced and the thread 20 pulled out from the rotary hook 200 is tightened by the thread pull-out actuator 17, the sewing thread 20 is inserted into the rotary hook 200. A gap formed between the outer hook 201 and the inner hook 205 is used. That is, the sewing thread 20 is inserted into a gap formed between the outer hook 201 and the inner hook 205.

  As shown in FIGS. 1, 2, 17, and 19 (A) to (H), the biasing / yarn withdrawal actuator driving mechanism 500 includes a cam follower 502 that moves along the cam groove 501 a of the cylindrical cam 501. In order to linearly reciprocate the yarn withdrawal actuator 17 in the horizontal direction based on the cam motion, a cam follower 502 is attached to one end and the yarn withdrawal operator 17 is connected to the other end, and is arranged from the upper shaft 5 toward the lower shaft 6. A thread pulling actuator driving rod 503, a bias control arm 506 that is connected to the thread pulling actuator driving rod 503 and linearly reciprocates the biasing element 16 via the bias driving arm 508; The actuator 17 and the biasing element 16 are provided with a biasing / thread-drawing actuator sliding base 516 that slides the bed 17 in the same direction as the axial direction of the lower shaft 6. In the present specification, “sliding” means sliding in a contact state.

  The cam groove 501a of the cylindrical cam 501 has a groove crossing point 501b on the cylindrical surface so that one cycle of the groove is two cycles and one cycle, and the cam follower 502 starts from the groove crossing point 501b, and the groove crossing is performed one rotation at a time. It is formed so as to return to the point 501b. The cam groove 501a is formed with two grooves on the cylindrical surface of the cylindrical cam 501 except for the groove intersection point 501b. Note that the shape of the cam follower 502 has a substantially oval planar shape and an acute end so that the cam follower 502 does not enter the groove direction intersecting from the groove direction that goes straight at the groove intersection point 501b.

  A thread pulling-out actuator driving rod 503 is a boss for rotatably mounting on a support pin 507a provided on a control stand 507 fixed to a portion of the frame 1 connecting the arm 2 and the bed 3. A portion 503a is provided between one end and the other end, and the other end is connected to a rear end 17b serving as a connecting portion of the yarn pull-out operator 17 via a yarn pull-out connecting link 514. The yarn withdrawal actuator driving rod 503 is configured such that one end where the cam follower 502 is mounted is a power point, the other end where the yarn withdrawal operator 17 is connected is an action point, and the boss portion 503a is a fulcrum.

  The bias control arm 506 is inserted in the support pin 507a of the control stand 507 so that the longitudinal direction thereof is the same as that of the yarn pullout actuator driving rod 503 and the upper end thereof is freely rotatable. A biaser control arm 506, a washer 505, and a thread pullout actuator drive rod 503 are inserted into the support pin 507a of the control base 507 in the order of the biaser control arm 506, washer 505, and thread pullout actuator drive rod 503. It is installed.

  Further, a long hole 503b whose horizontal direction is the longitudinal direction is formed between the boss portion 503a and the other end of the yarn pullout actuator driving rod 503, and the biasing control arm 506 has a lower end of the biasing device driving arm 508 at the lower end. One end and the other end are connected by a connecting pin 511, and a support pin 508 a provided so as to protrude from one end of the bias drive arm 508 is formed between the upper end and the lower end of the bias control arm 506. In addition to the elongated hole 506a whose horizontal direction is the longitudinal direction, it is also inserted into the elongated hole 503b of the yarn pullout actuator driving rod 503. The elongated hole 503b of the yarn pullout actuator driving rod 503 does not catch the support pin 508a of the biasing actuator driving arm 508 even if the yarn pullout actuator driving rod 503 swings around the support pin 507a of the control stand 507. It is formed in a bow shape. The elongated hole 506a of the bias control arm 506 has an arcuate shape so that the support pin 508a of the bias drive arm 508 is not caught even if the bias control arm 506 swings around the support pin 507a of the control base 507. Is formed. A connecting pin 508 b is provided at the other end of such a bias driving arm 508 so as to protrude, and is inserted into a long hole 16 b whose longitudinal direction is the longitudinal direction at the rear end of the bias 16.

  Further, in FIG. 17, a frame 1 that connects a spring hook arm 506 b formed to extend rightward on the upper end of the bias control arm 506 and an arm 2 and a bed 3 below the spring hook arm 506 b. By connecting the spring hook 513 fixed to this portion with the bias control arm spring 512, the spring hook arm 506b is always pulled downward by the elastic force of the bias control arm spring 512. Therefore, the bias control arm 506 is always biased by the bias control arm spring 512 so as to rotate clockwise. The bias control arm 506 is provided with a rotation stop pin 506c toward the control table 507, and the rotation stop pin 506c is movable to a long hole 507b formed in the control table 507 in the vertical direction. Since it is fitted, the rotation stop position in the clockwise direction is determined by the bias control arm spring 512 of the bias control arm 506.

  Further, a spring hanging arm 508c formed to extend in the right direction at a connecting portion between the biasing drive arm 508 and the bias control arm 506, and a lower right end portion of the control stand 507 positioned above the spring hanging arm 508c. By connecting the spring hooks 507c provided on the lever with the bias drive arm spring 510, the bias drive arm 508 is connected to the bias control arm 506 of the bias drive arm 508 by the elastic force of the bias drive arm spring 510. It is urged to always rotate counterclockwise around the connecting portion as the center of rotation.

  A sliding long hole 516a is formed in the biasing / thread-drawing actuator sliding base 516 for linearly reciprocating the biasing element 16 in the horizontal direction perpendicular to the sewing direction L (see FIG. 1). The biasing element 16 is placed on the plate surface 516b of the biasing / thread-drawing actuator slide 516, and is connected to the biasing / thread-drawing action slider slide 516 by a step pin 518 from below the sliding long hole 516a. . Therefore, the biasing element 16 can linearly reciprocate the biasing element 16 in the horizontal direction within a range in which the step pin 518 can move in the longitudinal direction of the sliding long hole 516a. In addition, a sliding long hole 516c is formed for linearly reciprocating the thread drawing operator 17 in the horizontal direction perpendicular to the sewing direction L (see FIG. 1). It is placed on the plate surface 516b of the thread pull-out operator slide base 516, and is connected to the biasing / thread-draw-out actuator slide base 516 by a step pin 517 from below the slide long hole 516c. Therefore, the yarn withdrawal operator 17 can linearly reciprocate the yarn withdrawal operator 17 in the horizontal direction within a range in which the step pin 517 can move in the longitudinal direction of the sliding long hole 516c.

  The bias / yarn withdrawal actuator drive mechanism 500 having such a configuration operates as shown in FIGS. 19 (A) to 19 (H). In the description of the operation, when directions are indicated, the description will be made with FIGS. 19A to 19H viewed from the front. 19A to 19H, the feed dog 401 and the sewing thread 20 are not shown.

  19 (A) to 19 (H) correspond to FIGS. 4 (A) to 4 (H), and FIG. 19 (A) shows a state in which the upper shaft 5 is 0 degree (720 degrees). 19B is a state where the upper shaft 5 is 60 degrees, FIG. 19C is a state where the upper shaft 5 is 180 degrees, FIG. 19D is a state where the upper shaft 5 is 270 degrees, and FIG. The upper shaft 5 is 360 degrees, FIG. 19F is the upper shaft 5 is 410 degrees, FIG. 19G is the upper shaft 5 is 540 degrees, and FIG. 19H is the upper shaft 5 is 610. A state of degrees. Accordingly, the biasing element 16 and the thread drawing operation element 17 can operate as described in the operation description with reference to FIGS. 4A to 4H described above.

  FIG. 19A shows a state where the rotary hook 200 is stopped, and the thread pull-out operator 17 moves backward (moves in the right direction in the figure) to pull out the sewing thread 20 via the thread outlet 209a of the rotary hook 200. The feed dog 401 is in the inter-stitch feed state, and the biasing element 16 is located at the last retreat point (the rightmost point in the figure). The feeding direction of the sewing object is assumed to be from the near side to the far side.

  Further, in FIG. 19A, the cam follower 502 of the yarn withdrawal operator driving rod 503 is located at the groove intersection point 501b of the cylindrical cam 501, and the longitudinal direction of the yarn withdrawal actuator driving rod 503 is substantially vertical. Further, the bias control arm 506 is repelled clockwise around the support pin 507a of the control base 507 by the elastic force of the bias control arm spring 512. Since 506c is in contact with the lower end surface of the long hole 507b of the control base 507, the rotation is stopped at that position. Further, since the biasing drive arm 508 is repelled counterclockwise around the connecting pin 511 by the elastic force of the biasing drive arm spring 510, the connecting pin 508a is threaded to the thread pulling actuator driving rod 503. Is in contact with the left end surface of the elongated hole 503b, but not in contact with the left end surface of the elongated hole 506a of the bias control arm 506.

  When the cylindrical cam 501 rotates by rotating the upper shaft 5 from 0 degrees to 60 degrees in such a state, the cam follower 502 moves along the cam groove 501a that is gradually formed in the left direction. The thread draw-out actuator driving rod 503 swings counterclockwise about the support pin 507a of the control table 507 as the center of rotation. Since the elongated hole 503b also moves to the right, which is the swinging direction, when the thread pullout actuator driving rod 503 swings counterclockwise, the connecting pin 508a of the biaser driving arm 508 is connected to the left end of the elongated hole 503b. The bias drive arm 508 swings in the clockwise direction against the elastic force of the bias drive arm spring 510. Accordingly, the biasing element 16 slides leftward through the thread drawing connection link 514 and protrudes to the maximum (FIGS. 19A, 19B, and 5). The state of the biasing element 16 is the state shown in FIG. 4B, and the hook 10 starts to descend. In this state, the bias control arm 506 only moves the connecting pin 508a of the bias drive arm 508 within the elongated hole 506a.

  Further, when the thread pullout actuator driving rod 503 swings counterclockwise, the thread pullout actuator 17 slides back and moves backward via the thread pullout actuator connecting link 514. The portion 17a moves in the direction of the right retracted position of the rotary hook 200 (FIGS. 19A, 19B, and 5). The state of the thread drawing operation element 17 is the state shown in FIG. 4B, and the hook 10 starts to descend.

  Furthermore, when the upper shaft 5 rotates from 60 degrees to 180 degrees, the cylindrical cam 501 rotates. When the rotation of the upper shaft 5 exceeds 120 degrees, the cam follower 502 is gradually formed in the left direction. Therefore, the yarn pullout actuator driving rod 503 further swings counterclockwise around the support pin 507a of the control table 507 as the center of rotation. Accordingly, the thread pull-out operator 17 slides further to the right and retracts via the thread pull-out actuator connecting link 514 (FIGS. 19C and 5). The state of the thread pull-out operator 17 is the state shown in FIG. 4C, and the needle 10 is being lowered.

  Further, when the thread pullout actuator driving rod 503 further swings counterclockwise, the connecting pin 508a of the biasing actuator driving arm 508 that is in contact with the left end surface of the elongated hole 503b is further pushed up. At this time, after the connecting pin 508a of the bias drive arm 508 contacts the right end surface of the elongated hole 506a of the bias control arm 506, the connecting pin 508a further moves the right end surface of the elongated hole 506a of the bias control arm 506 rightward. Therefore, the bias control arm 506 swings counterclockwise against the elastic force of the bias control arm spring 512. When the bias control arm 506 swings counterclockwise, the bias drive arm 508 counterclockwise together with the bias control arm 506 while the connecting pin 508a is in contact with the right end surface of the elongated hole 506a of the bias control arm 506. Therefore, the biasing element 16 slides in the right direction and starts retreating from the maximum protrusion, and the sewing thread biased in the recess 16a of the biasing element 16 before the needle 10 reaches the bottom dead center. 20 can be brought into circumferential contact with the heel needle 10 (FIG. 19C, FIG. 5). The state of the biasing element 16 is the state shown in FIG. 4C, and the hook needle 10 is being lowered.

  Further, when the cylindrical cam 501 rotates by rotating the upper shaft 5 from 180 degrees to 270 degrees, the cam follower 502 moves along the cam groove 501a that is gradually formed in the right direction. The child drive rod 503 starts swinging clockwise with the support pin 507a of the control table 507 as the center of rotation. Accordingly, the thread pull-out operator 17 slides leftward via the thread pull-out connecting link 514 and starts moving forward (FIGS. 19D and 5). The state of the thread drawing operation element 17 is the state shown in FIG. 4D, and the heel needle 10 starts to rise. Further, when the thread pullout actuator driving rod 503 starts to swing clockwise, the connecting pin 508a of the biasing drive arm 508 that is in contact with the left end surface of the elongated hole 503b is returned to the left, and the connecting pin 508a. , The bias control arm 506 is also swung clockwise by the elastic force of the bias control arm spring 512, and the rotation stop pin 506c is in contact with the lower end surface of the elongated hole 507b of the control base 507. Stop at. Therefore, the biasing element 16 slides to the left and moves forward to some extent and stops (FIG. 19D, FIG. 5). The state of the biaser 16 is the state shown in FIG. 4D, and the hook 10 starts to rise.

  Further, when the cylindrical cam 501 is rotated by the rotation of the upper shaft 5 from 270 degrees to 360 degrees, the cam follower 502 of the yarn withdrawal actuator driving rod 503 is positioned at the groove crossing point 501b of the cylindrical cam 501, so The yarn pulling-out actuator driving mechanism 500 is the same as the state shown in FIG. 19A (FIGS. 19E and 5). The state of the biasing element 16 and the thread drawing operation element 17 is the state shown in FIG. 4E, and the hook needle 10 is located at the top dead center.

  Further, when the cylindrical cam 501 is rotated by rotating the upper shaft 5 from 360 degrees to 410 degrees, the cam follower 502 is moved along the cam groove 501a that is gradually formed in the right direction. The child drive rod 503 swings clockwise with the support pin 507a of the control table 507 as the center of rotation. Accordingly, the thread pull-out operator 17 moves forward by sliding leftward via the thread pull-out connecting link 514 (FIG. 19F, FIG. 5). The state of the thread drawing operation element 17 is the state shown in FIG. 4F, and the hook 10 starts to descend. Further, when the thread pull-out actuator driving rod 503 is swung clockwise, the elongated hole 503b is also moved to the left, which is the rocking direction. Since it is in contact with the surface, the biasing element 16 is retracted to the right retracting position of the rotary hook 200. (FIG. 19F, FIG. 5). The state of the biaser 16 is the state shown in FIG. 4F, and the hook 10 starts to descend.

  Further, even if the cylindrical cam 501 is rotated by rotating the upper shaft 5 from 410 degrees to 540 degrees, the cam groove 501a of the cylindrical cam 501 remains at the same position as in FIG. The drawer actuator 17 is stopped (FIGS. 19G and 5). The state of the biasing element 16 and the thread drawing operation element 17 is the state shown in FIG. 4G, and the eyelid needle 10 is located at the bottom dead center.

  Further, when the cylindrical cam 501 is rotated by rotating the upper shaft 5 from 540 degrees to 610 degrees, the cam follower 502 moves along the cam groove 501a formed in the right direction. The flange 503 swings clockwise with the support pin 507a of the control base 507 as the center of rotation. At this time, the connecting pin 508a of the biasing element driving arm 508 moves in the elongated hole 503b of the yarn pulling actuator driving rod 503 and comes into contact with the right end surface of the elongated hole 503b and swings of the yarn extracting actuator driving rod 503. Stops. Accordingly, the thread pull-out operator 17 moves forward by sliding leftward via the thread pull-out connecting link 514 (FIGS. 19H and 5). The state of the thread drawing operation element 17 is the state shown in FIG. 4 (H), and the needle 10 has started to rise. Further, when the thread pull-out actuator driving rod 503 is swung clockwise, the elongated hole 503b is also moved to the left, which is the rocking direction. Since it is located in the surface direction, the biasing element 16 is retracted to the right retracting position of the rotary hook 200. (FIG. 19 (H), FIG. 5). The state of the biaser 16 is the state shown in FIG. 4 (H), and the hook 10 has started to rise.

  Further, when the cylindrical cam 501 rotates by rotating the upper shaft 5 from 610 degrees to 720 degrees, the cam follower 502 moves along the cam groove 501a formed in the left direction. The flange 503 swings counterclockwise about the support pin 507a of the control base 507 as the center of rotation. Therefore, the thread pull-out operator 17 slides backward through the thread pull-out connecting link 514 (FIG. 19 (H), FIG. 19 (A) and FIG. 5). The state of the thread drawing operation element 17 is the state shown in FIG. 4A, and the needle 10 is located at the top dead center. Further, when the thread pull-out actuator driving rod 503 swings clockwise, the elongated hole 503b also moves to the left, which is the swinging direction, but the connecting pin 508a of the biasing actuator driving arm 508 is the right end of the elongated hole 503b. Since it is located in the surface direction, the biasing element 16 is retracted to the right retracted position of the rotary hook 200 (FIG. 19 (H), FIG. 19 (A) and FIG. 5). The state of the biasing element 16 is the state shown in FIG. 4A, and the hook needle 10 is positioned at the top dead center.

  By repeating one cycle of such sewing, hand stitch stitches are formed on the surface of the workpiece 21 and lock stitches are formed on the back surface.

  As shown in FIGS. 1, 2, and 18, the yarn shifting mechanism 600 is provided between the counterweight 101 of the upper shaft 5 and the cylindrical cam 501, and the rotational motion of the upper shaft 5 in the horizontal direction is changed to the rotational motion in the vertical direction. A bevel gear 607 to be converted, a yarn shift shaft 604 that transmits the rotary motion converted from the horizontal direction to the vertical direction by the bevel gear 607, and a yarn shifter that converts the rotary motion of the yarn shift shaft 604 into a crank motion. A shaft arm 605 is provided.

  Specifically, the first gear 607A of the bevel gear 607 is fixed to the upper shaft 5, and the second gear 607B is fixed to one end (upper end) of the yarn shifting shaft 604. A yarn gathering shaft arm 605 is fixed to the other end (lower end) of the yarn gathering shaft 604, and a yarn gathering arm 601 is rotatably attached to an arm end portion 605a of the yarn gathering shaft arm 605. A yarn holder 15 is fixed to the tip of the yarn holder arm 601. Further, on the bed 3, a yarn gathering table 606 is fixed so as to cover the yarn gathering arm 601 and the yarn gathering 15, and a yarn gathering shaft 604 passes therethrough. It should be noted that the tip 15a always protrudes from the yarn gathering table 606, and a hole 606a for slidably fitting the yarn gather 15 is formed at the tip of the yarn gathering table 606. .

  When the upper shaft 5 rotates in the yarn gathering mechanism 600 having such a configuration, the first gear 607A of the bevel gear 607 rotates the yarn gathering shaft 604 via the second gear 607B of the outer hook 201. 605 cranks and swings while moving the yarn gathering 15 forward and backward through the yarn gathering arm 601. At this time, the swinging range of the yarn gathering 15 is not limited in the direction orthogonal to the sewing direction L, but the swinging range is limited by the hole 606a of the threading stand 606 in the same direction as the sewing direction L. The tip 15a of the gather 15 can be moved elliptically. Therefore, since the yarn gathering 15 moves like the movement locus shown in the motion diagram of FIG. 5, the sewing thread 20 captured by the thread catching rod 10a when the heel needle 10 descends from the top dead center in the second stroke of the heel needle 10. It is possible to squeeze the thread between the needle tip of the heel needle 10 and the body 21 to be sewn by the tip portion 15a of the thread gather 15.

  Although the present invention has been described with the specific embodiments shown in the drawings, the present invention is not limited to the embodiments shown in the drawings, and is known so far as long as the effects of the present invention are achieved. It goes without saying that any configuration can be adopted.

1 is an overall perspective view showing a preferred embodiment example of a single-thread locked hand-stitch sewing machine of the present invention. It is a block diagram which shows the drive system of the single thread lock sewing hand stitch sewing machine of this invention. It is explanatory drawing which shows the movement locus | trajectory of the yarn shifting of the yarn shifting mechanism in the single thread lock sewing hand stitch sewing machine of the present invention. It is operation | movement explanatory drawing which shows the single thread lock sewing hand stitch formation method about operation | movement of the single thread lock sewing hand stitch sewing machine by this invention. It is operation | movement explanatory drawing which shows the single thread lock sewing hand stitch formation method about operation | movement of the single thread lock sewing hand stitch sewing machine by this invention. It is operation | movement explanatory drawing which shows the single thread lock sewing hand stitch formation method about operation | movement of the single thread lock sewing hand stitch sewing machine by this invention. It is operation | movement explanatory drawing which shows the single thread lock sewing hand stitch formation method about operation | movement of the single thread lock sewing hand stitch sewing machine by this invention. It is operation | movement explanatory drawing which shows the single thread lock sewing hand stitch formation method about operation | movement of the single thread lock sewing hand stitch sewing machine by this invention. It is operation | movement explanatory drawing which shows the single thread lock sewing hand stitch formation method about operation | movement of the single thread lock sewing hand stitch sewing machine by this invention. It is operation | movement explanatory drawing which shows the single thread lock sewing hand stitch formation method about operation | movement of the single thread lock sewing hand stitch sewing machine by this invention. It is operation | movement explanatory drawing which shows the single thread lock sewing hand stitch formation method about operation | movement of the single thread lock sewing hand stitch sewing machine by this invention. It is operation | movement explanatory drawing which shows the single thread lock sewing hand stitch formation method about operation | movement of the single thread lock sewing hand stitch sewing machine by this invention. It is operation | movement explanatory drawing which shows the operation state of the needle of a single thread lock sewing hand stitch sewing machine by this invention, a rotary hook, a thread | yarn feeder, a biasing element, a feed dog, a lid needle, and a thread | yarn withdrawal operator. It is explanatory drawing which shows the pseudo | simulation hand stitch stitch structure obtained with the single thread lock sewing hand stitch formation method and sewing machine by this invention. It is a disassembled perspective view except the flame | frame in FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a perspective view showing an acupuncture needle / lid needle drive mechanism in a single-thread locked hand-stitch sewing machine of the present invention, and FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an acupuncture needle / lid needle drive mechanism in a single-thread locked hand stitch sewing machine of the present invention, and FIG. It is a disassembled perspective view which shows the needle | hook / lid needle drive mechanism in the single thread lock sewing hand stitch sewing machine of this invention. FIG. 4 is a perspective view showing the relationship between the heel needle and the lid needle, (A) is a diagram in which the thread catching heel of the heel needle is closed by the lid needle, and (B) is a diagram in which the thread catching heel of the needle is in the open state. is there. FIG. 4 is a partial perspective view showing the relationship between the heel needle and the lid needle, in which (A) is a view in which the thread catching heel of the heel needle is closed by the lid needle, and (B) is a view in which the thread catching heel of the heel needle is in the open state It is. It is a disassembled perspective view which shows the presser mechanism in the single thread lock sewing hand stitch sewing machine of this invention. It is a perspective view which shows the cloth feed mechanism in the single thread lock sewing hand stitch sewing machine of this invention. It is a disassembled perspective view which shows the cloth feed mechanism in the single thread lock sewing hand stitch sewing machine of this invention. It is a perspective view which shows the rotary hook in the single thread lock sewing hand stitch sewing machine of this invention. It is a disassembled perspective view which shows the rotary hook in the single thread lock sewing hand stitch sewing machine of this invention. It is a disassembled perspective view which shows the biasor and the thread | yarn withdrawal operator drive mechanism in the single thread lock sewing hand stitch sewing machine of the present invention. It is a disassembled perspective view which shows the thread | yarn shift mechanism in the single thread lock sewing hand stitch sewing machine of this invention. It is operation | movement explanatory drawing which shows the operation state of the needle | hook / lid needle drive mechanism of the single thread lock sewing hand stitch sewing machine by this invention, a biasor / thread extraction actuator drive mechanism, and a thread | yarn-feed mechanism. It is operation | movement explanatory drawing which shows the operation state of the needle | hook / lid needle drive mechanism of the single thread lock sewing hand stitch sewing machine by this invention, a biasor / thread extraction actuator drive mechanism, and a thread | yarn-feed mechanism. It is operation | movement explanatory drawing which shows the operation state of the needle | hook / lid needle drive mechanism of the single thread lock sewing hand stitch sewing machine by this invention, a biasor / thread extraction actuator drive mechanism, and a thread | yarn-feed mechanism. It is operation | movement explanatory drawing which shows the operation state of the needle | hook / lid needle drive mechanism of the single thread lock sewing hand stitch sewing machine by this invention, a biasor / thread extraction actuator drive mechanism, and a thread | yarn-feed mechanism. It is operation | movement explanatory drawing which shows the operation state of the needle | hook / lid needle drive mechanism of the single thread lock sewing hand stitch sewing machine by this invention, a biasor / thread extraction actuator drive mechanism, and a thread | yarn-feed mechanism. It is operation | movement explanatory drawing which shows the operation state of the needle | hook / lid needle drive mechanism of the single thread lock sewing hand stitch sewing machine by this invention, a biasor / thread extraction actuator drive mechanism, and a thread | yarn-feed mechanism. It is operation | movement explanatory drawing which shows the operation state of the needle | hook / lid needle drive mechanism of the single thread lock sewing hand stitch sewing machine by this invention, a biasor / thread extraction actuator drive mechanism, and a thread | yarn-feed mechanism. It is operation | movement explanatory drawing which shows the operation state of the needle | hook / lid needle drive mechanism of the single thread lock sewing hand stitch sewing machine by this invention, a biasor / thread extraction actuator drive mechanism, and a thread | yarn-feed mechanism.

10 …… Hane needle 10a …… Thread catching rod 13 …… Needle plate 16 …… Biaser 17 …… Thread pulling actuator 200 …… Half-turn hook 201a …… Sword tip 209a …… Thread outlet 401 …… Feeding tooth 600 …… Thread gathering mechanism 20 ... Sewing thread 21 ... Sewing object

Claims (1)

It descends from the top dead center, penetrates the body to be sewn placed on the needle plate, comes out of the body to be sewn from the bottom dead center, rises, and descends from the top dead center in the first stroke that linearly reciprocates in the vertical direction. When the thread penetrates the sewing body and rises from the bottom dead center, the thread is captured, descends from the top dead center in the second stroke, penetrates the sewing body, and rises from the bottom dead center. An acupuncture needle with a thread catching heel to release the captured thread;
A rotary hook below the needle plate and wound with a thread and pulled out from a thread outlet, and descends from the top dead center in the first stroke, penetrates the sewing object, and the bottom dead When raising from the point, the yarn is tightened with the raising of the needle that has captured the yarn with the yarn catching rod, and the needle is lowered from the top dead center in the second stroke and is moved to the sewing object. When the hook penetrates and rises from the bottom dead center, the hook has a sword that rotates and catches the thread that has been caught by the thread catching sword. A rotary hook that is released from the thread catching rod and passes the released thread into the hook as the hook further rotates and intersects with the yarn wound around the hook;
When the heel needle descends from the top dead center in the first stroke and penetrates the workpiece to be sewn placed on the needle plate and rises from the bottom dead center, the thread is wound below the needle plate and rotated. A biasing element for biasing a thread drawn from a thread outlet of a hook with a lowering of the hook needle and then returning immediately before the raising of the hook needle to return the thread to the hook needle and catch it with the thread catching hook. When,
Thread that pulls up the loosened thread after threading the thread before the needle moves down from the top dead center and penetrates the sewing object in the second stroke, and tightens the thread that has passed through the hook. A shifting mechanism;
A thread pulling operator for tightening the thread pulled out from the thread outlet by rotation of the hook when the thread catching rod captures the thread;
While the heel needle is pulled out of the sewing body in the first stroke and is raised and passes through the top dead center, the sewing body is fed by one stitch pitch, and the heel needle is fed in the sewing work in the second stroke. A feed dog that feeds the workpiece to be pitched between stitches while it is lifted out of the body and passes through the top dead center is provided with hand stitch stitches on the surface of the workpiece and locks on the back. A single-thread locked hand-stitch sewing machine, wherein each stitch is formed.

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