JP5408645B2 - 1 thread lock sewing hand stitch sewing machine - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single-thread locked hand-stitch sewing machine, and in particular, a pinpoint / saddle that can perform a preparatory work for starting sewing very easily and in a short time and can reliably capture a thread to a thread catching thread of a needle. The present invention relates to a single-thread locked hand stitch sewing machine suitable for a pseudo hand stitch called a stitch.

  Conventionally, the inventor of the present application has sewn a single thread lock suitable for a pseudo hand stitch called a pinpoint / saddle stitch, in which the sewing thread is reliably captured by the thread catching ridge of the needle, and the seam is formed in the space inside the sewing machine bed. A hand stitch sewing machine has already been proposed (see, for example, Patent Document 1).

  According to this single-thread-locked hand stitch sewing machine, the thread catching rod is provided on the side, and the needle trapping reciprocating linearly in the vertical direction, reciprocating like a half-rotating shuttle that rotates half-rotating forward and backward, and a balance. By cooperating the thread pull-out actuator and the feed dog that moves in an elliptical manner, the sewing thread is securely captured by the needle thread catching ridge, and the seam is formed in the space inside the sewing machine bed, so that the surface of the workpiece is sewn. Hand stitch stitches and lock stitches can be formed on the back.

Patent No. 3963939

  In this single-thread locked hand stitch sewing machine, the following operational procedure is required as a preparatory work for starting sewing.

  1. Hang the thread on the needle and stretch the thread.

  2. In this state, the sewing machine is manually operated to create a state in which the thread is raised on the needle plate.

  3. In this state, the thread is tensioned by hand, the sewing machine is manually operated again, and the thread is hung on the thread drawing operation element.

  4). Fix the thread that was tense by hand in an appropriate place.

  This procedure completes the preparatory work for starting sewing, but in the first place such a preparatory work is a troublesome manual work for a sewing manufacturer.

  The present invention has been made in order to solve such a conventional difficulty, and the preparatory work for starting sewing can be performed very easily in a short time, and the thread is reliably captured by the thread catching thread of the saddle needle. An object of the present invention is to provide a single-thread locked hand stitch sewing machine suitable for a pseudo hand stitch called a pinpoint / saddle stitch.

  In order to achieve the above object, a single-thread locked hand-stitch sewing machine of the present invention is lowered from the top dead center and penetrates a workpiece to be laid on a needle plate and held by a presser foot. From the point, the thread is pulled out from the sewing body, rises, descends from the top dead center in the first stroke that linearly reciprocates, penetrates the sewing body, and catches the thread when rising from the bottom dead center, In the two strokes, when the needle descends from the top dead center, penetrates the body to be sewn, and rises from the bottom dead center, it is located below the needle plate and the needle needle that is provided with a thread catching rod that releases the captured yarn. A hook that is wound with yarn and pulled out from the yarn outlet. When it descends from the top dead center in the first stroke, penetrates the body to be sewn, and rises from the bottom dead center, the yarn is caught by the yarn catch rod. The thread is tightened along with the raised needle and the needle moves in the second stroke. When it descends from the top dead center, penetrates the workpiece, and ascends from the bottom dead center, it has a sword tip that rotates the hook that was caught by the thread catching rod, and the caught thread is caught in the hook. Rotate the hook with the sword tip of the hook to release it from the thread catching hook, and the hook rotates by rotating the hook further into the hook and crossing the thread wound around the hook. The thread pull-out operator that tightens the thread that has passed through the hook, and the needle is pulled out from the body to be sewn in the first stroke and raised to pass the top dead center. The surface of the workpiece is provided with a feed dog that feeds and feeds the workpiece to be pitched by one stitch while the needle moves out of the workpiece in the second stroke and rises and passes through the top dead center. Hand stitch seams, lock stitches on the back It is intended to formed.

In this single-thread-locked hand stitch sewing machine, the hook has a bobbin case that houses the bobbin around which the thread is wound, and the bobbin case is rotatably mounted together with the inner hook on the outer hook. The thread outlet is provided in the bobbin case in a direction and a position where the hook rotates and moves away from the needle plate when the needle goes up from the needle plate,
Provided on the bobbin case, with a yarn guide adjacent to the yarn outlet in parallel with the rotary axis of the hook ,
As a preparatory work to start sewing, when the thread is inserted into the thread catching rod of the heel needle, it is installed by laying the free end of the thread pulled out from the bobbin through the thread outlet between the thread outlet and the thread guide. The thread is forcedly inserted into the thread catcher when the needle is raised.

  The single-thread locked hand-stitch sewing machine of the present invention also has the hook raised between the yarn outlet and the yarn guide so as to be in contact with the installed yarn, and the yarn installed by rotation of the hook is used as the needle. It is what you press.

  Further, in the single-thread locked hand stitch sewing machine of the present invention, the yarn outlet and the yarn guide are arranged adjacent to and parallel to the rotary axis of the shuttle so that the yarn is installed in parallel with the rotary axis.

  According to the single thread lock hand stitch sewing machine of the present invention, the preparatory work for starting sewing can be performed very easily in a short time, and the pinpoint / You can sew pseudo-hand stitches called saddle stitches.

  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 FIGS. 1 and 2, the single-stitched hand stitch sewing machine according to the present invention has a frame 1 comprising an arm 2 and a bed 3 and is provided with a thread catching bar 13a on a side and linearly reciprocates in the vertical direction. The needle 13 for piercing the sewing thread 20 into the body 21 to be sewn, the half-rotation hook 200 for making the stitches 20 by crossing the sewing thread 20 by reversing the half-rotation forward rotation and half-rotation, the reciprocating movement like a balance, and loosening the sewing thread 20 A thread pulling operation element 401 for giving and tightening the seam, a feed tooth 601 for elliptically moving to feed the sewing object 21 and the like are mounted, and sewing is performed with one sewing thread 20 wound around the half-turn hook 200. This is a sewing machine that forms hand stitch stitches on the surface of the body 21 and lock stitches on the back surface.

  The arm 2 is provided with an upper shaft 5 and an intermediate shaft 8, and the bed 3 is provided with a horizontal feed shaft 605, a vertical feed shaft 613, and a shuttle shaft 201 in the horizontal direction. The upper shaft 5 is an upper shaft front metal 7 and an upper shaft rear metal 6, and the intermediate shaft 8 is an intermediate shaft front metal 9 and an intermediate shaft rear metal 10 that are rotatably mounted on the arm 2. The horizontal feed shaft 605 is a metal before a horizontal feed shaft (not shown) and a metal after a horizontal feed shaft (not shown), and the vertical feed shaft 613 is a metal 614 before a vertical feed shaft and a metal after a vertical feed shaft (not shown). And each is rotatably installed on the bed 3. The hook shaft 201 is rotatably mounted on the bed 3 with the hook shaft rear metal (not shown) and the half-turn hook 200 hook shaft front metal (outer hook mounting portion) 202c (FIG. 6). The inner pot driver 203 is fixed.

  A driven pulley 4 is provided at one end of the upper shaft 5 and is driven by a motor M through a drive belt MB that is an endless belt. Further, the other end of the upper shaft 5 is provided with a counterweight 101 of the eyelet / lid needle driving mechanism 100 for driving the eyelet needle 13, and a cloth feed mechanism 600 for causing the feed dog 601 to elliptically move in the middle of the upper shaft 5. A cloth feed drive mechanism 700 for driving is connected, and an upper shaft drive pulley 25 for driving the feed amount setting mechanism 300 for the stitch pitch / inter-stitch pitch is provided at a position near the driven pulley 4 of the upper shaft 5. Yes. The intermediate shaft 8 is connected to a shuttle driving mechanism 220 that drives the half-rotating shuttle 200 and a thread withdrawal drive mechanism 400 that drives the thread withdrawal operator 401.

  The heel needle / lid needle drive mechanism 100 moves the heel needle 13 down from the top dead center, penetrates the sewing body 21 placed on the throat plate 12, and comes out of the sewing body 21 from the bottom dead center and ascends. In the first stroke that linearly reciprocates in the direction, the sewing thread 20 is captured by the thread catching bar 13a when it descends from the top dead center, penetrates the workpiece 21 and ascends from the bottom dead center, and top dead in the second stroke. This is a mechanism configuration that can release the sewing thread 20 that has been captured by the thread catching bar 13a when descending from the point, penetrating the workpiece 21 and rising from the bottom dead center. In the present specification, the “first stroke of the eyelid needle 13” means the first needle until the needle 13 reaches the needle upper dead center → the needle lower dead center → the needle upper dead center, and “the second stroke of the needle 13”. Means the second needle until the needle 13 reaches the needle top dead center → the needle bottom dead center → the needle top dead center.

  As shown in FIGS. 4 (A) and 4 (B), the hook 13 is configured such that the thread catching hook 13a is opened and closed by the lid needle 14, and the needle bar 11 to which the hook 13 is fixed is linearly aligned in the vertical direction. By reciprocating, the scissors 13 eventually linearly reciprocates in the vertical direction.

  In this single thread lock hand stitch sewing machine, the hook 202 is located below the needle plate 12 and houses a bobbin case 212 in which the bobbin 211 around which the thread 20 is wound is housed in the inner hook 205. Along with the inner hook 205, the outer hook 202 is rotatably mounted.

  The bobbin case 212 has a yarn outlet 212a from which the yarn 20 is drawn, and a yarn guide 212b for laying the yarn 20 between the yarn outlets 212a.

  The yarn outlet 212a is provided in the bobbin case in a direction and a position where the hook rotates and moves away from the needle plate when the needle needle rises from the needle plate. When the needle 13 is inserted, the free end of the yarn 20 drawn from the bobbin 211 via the yarn outlet 212a is installed between the yarn outlet 212a and the yarn guide 212b. This is forcibly inserted into the yarn catch bar 13a when ascending.

  Further, the single-thread locked hand stitch sewing machine of the present invention is erected between the yarn outlet 212a and the yarn guide 212b so as to be in contact with the laid yarn 20 and laid by rotation of the hook 202. The thread 20 is pressed against the heel needle 13.

  Further, in the single-thread locked hand stitch sewing machine of the present invention, the thread outlet 212a and the thread guide 212b are adjacent to the rotation axis of the hook 202 (FIG. 6) in parallel, and the thread 20 is installed in parallel with the rotation axis. To be arranged.

  As shown in FIGS. 5 and 6, such a semi-rotating hook 200 has a bobbin case 212 that houses a bobbin 211 around which the sewing thread 20 is wound, incorporated in the inner hook 205, and the bobbin case 212 is combined with the inner hook 205. Is rotatably mounted on the outer hook 202. A bobbin case 212 that houses a bobbin 211 around which a sewing thread 20 is wound, a bobbin case 212 that detachably accommodates, an inner hook 205 having a sword 205a, and an inner hook that is rotatably mounted to prevent rotation relative to the bed 3. The outer pot 202 is provided. The inner hook 205 has a bobbin case accommodating portion 205b for accommodating the bobbin case 212, and the bobbin case 212 is detachably accommodated in the bobbin case accommodating portion 205b. The outer hook 202 includes an inner hook driver 203 to which an inner hook driver spring 204 is fixed and an inner hook accommodating portion 202 a for accommodating the inner hook 205. The outer hook 202 is provided with a hook shaft front metal (outer hook mounting portion) 202c (FIG. 6) provided with a hook shaft hole (not shown) for rotatably inserting one end of the hook shaft 201. And the rotation center of the hook shaft hole and the inner hook housing portion 202a is concentric with the rotation center of the hook shaft 201.

  The inner hook driver 203 is accommodated in the inner hook accommodating portion 202a of the outer hook 202 and fixed to the hook shaft 201 inserted into the hook shaft hole 202b. Further, the inner hook 205 is slidably accommodated in the inner hook accommodating portion 202a by the inner hook retainer 206, the inner hook retainer 206 is slid by the right inner hook retainer 208 and the left inner hook retainer 209, and the inner hook retainer claw spring 210. Fix with spring force applied. A predetermined gap is formed between the inner hook 205 and the inner hook driver 203 to which the inner hook driver spring 204 is fixed. Further, the relationship between the inner hook driver spring 204 and the inner hook 205 of the inner hook driver 203 is that the free rotation of the inner hook 205 can be restricted at both ends of the inner hook driver spring 204. When the hook shaft 201 is rotated halfway forward, one end of the inner hook driver spring 204 comes into contact with the inner hook 205. Further, when the inner hook driver 203 is reversely rotated half a turn by the hook shaft 201, the other end of the inner hook driver spring 204 comes into contact with the inner hook 205. Further, an upper spring 207 for adjusting the looseness of the sewing thread 20 is fixed in the needle drop direction of the outer hook 202 with a screw. Further, the bobbin case 212 is provided with a thread outlet 212a in a direction and a position where the half-rotating hook 200 is reversely moved away from the needle plate when the needle 13 is lifted from the needle plate 12.

  As shown in FIGS. 1 and 2, the thread withdrawal drive mechanism 400 is configured so that the thread withdrawal operator 401 rotates when the half-rotating hook 200 rotates when the thread catching bar 13 a of the heel needle 13 catches the sewing thread 20. This is a mechanism configuration that allows the sewing thread 20 drawn out from the thread to be in contact with the heel needle 13 to be tensioned and tighten the sewing thread 20 that has been pulled out from the half-turn hook 200. In the present specification, “circumferential contact” means contact with a certain part. The thread pull-out operation element 401 pulls the sewing thread 20 pulled out from the thread outlet 212a of the half-rotating hook 200 after the sewing thread 20 captured by the thread catching bar 13a is beaten by the sword 205a of the half-rotating hook 200. It has a function of releasing the hooked sewing thread 20 after it has been hooked and pulled out from the half-turn hook 200 and tightened, and the thread catching bar 13a catches the sewing thread 20.

  When the intermediate shaft 8 rotates, the yarn drawing drive mechanism 400 having such a configuration swings the yarn drawing operation element 401. This swinging movement of the thread pull-out operation element 401 causes the sewing thread 20 pulled out from the thread outlet 212a to the heel needle 13 by the rotation of the half-rotating hook 200 when the thread catching ridge 13a of the heel needle 13 captures the sewing thread 20. The sewing thread 20 which is tensioned in contact with the circumference and tightened from the half-turn hook 200 is tightened, and after the sewing thread 20 is beaten by the sword 205a of the half-turn hook 200, it is pulled out from the thread outlet 212a of the half-turn hook 200. The sewn thread 20 is hooked, pulled out from the half-turn hook 200 and tightened. After the sewn thread 20 is captured by the thread catching bar 13a, the sewn thread 20 is released.

  The single-thread locked hand stitch sewing machine constructed in this way is hand-stitched stitches on the surface of the workpiece 21 and locks on the back surface by the cooperation of the needle 13, the half-turn hook 200, and the thread pull-out actuator 401. The stitches are formed as a jump stitch set, and the workpiece 21 is fed at the stitch pitch for the hand stitch stitch by the feed dog 601 at the first stroke of the heel needle 13, and by the feed dog 601 at the second stroke of the heel needle 13. The stitched body 21 is pitch-feeded between stitches for hand stitch stitches. For single-thread locked handstitch sewing machines, the stitch pitch feed amount for stitch pitch feed and the pitch feed amount between stitches for pitch feed between stitches are set individually, and the stitches are set for each jump stitch set. The respective stitch body feed modes corresponding to the pitch feed and the pitch feed between stitches are sequentially switched, and the set stitch pitch feed amount and the pitch feed amount between stitches are respectively set to the feed drive mechanism 700 in each stitch feed mode. Then, the workpiece 21 is fed by the feed dog 601. In this specification, “cooperation” means working in cooperation with other parts.

  The operation of such a single-thread locked hand stitch sewing machine is shown in FIGS. 7, 8 (A) to (B), and FIGS. F), FIGS. 10A to 10Q, and FIG. 11 will be described. 9 (A) to (F) and FIGS. 10 (A) to (Q) are operation explanatory views of the needle 13, the half-rotating hook 200 and the thread drawing operation element 401, and FIG. 11 shows the needle 13, the half-turn hook 200, It is a motion diagram of the thread drawing operation element 401, the lid needle 14 and the feed dog 601. In this operation description, FIGS. 7 and 8A to 8B will be described with the half-turn hook 200 viewed from above. FIGS. 9A to 9F are operation explanatory views of the needle 13, the half rotary hook 200, the yarn outlet 212a, and the yarn guide 212b. In the case of indicating the direction, the description will be made with FIGS. 10A to 10Q viewed from the front. 10A to 10Q, the feed dog 601 is not shown.

  10A to 10Q, the half hook reverse rotation of the half rotary hook 200 means that the inner hook 205 rotates counterclockwise, and the half rotary forward rotation of the half rotary hook 200 means that the inner hook 205 does not rotate. It shall rotate clockwise. Further, for convenience, the state in which the heel needle 13 in which the sewing thread 20 is not captured by the thread capturing rod 13a is located at the top dead center and the sword tip 205a of the inner hook 205 is located in the vertical downward direction (FIG. 10 ( The operation will be described from A)). In the state shown in FIG. 10A, the half-rotary shuttle 200 is stopped, the thread pull-out operator 401 is pulling the sewing thread 20 from the bobbin 211 through the thread outlet 212a of the bobbin case 212, and the lid needle 14 Is in a closed state, and the feed dog 601 is in an inter-stitch feed state. The feed direction of the sewing body 21 is left. Further, in FIG. 11, since the pulley 4 is formed as a jump stitch set by two rotations, one cycle of sewing is shown as 720 degrees on the upper shaft 5, and FIG. 10A shows that the upper shaft 5 is 0 degrees (720). Degree). When the upper axis 5 is 0 degree, the needle 13 is the top dead center, and when 180 degrees, the needle 13 is the bottom dead center, 360 degrees, the needle 13 is the top dead center, and the needle 13 is the bottom dead center at 540 degrees.

  As a preparatory work for starting sewing, the sewing thread 20 pulled out from the bobbin case 212 is installed between the thread outlet 212a and the thread guide 212b (FIGS. 8A and 9A). In this case, the end portion of the yarn 20 protruding from the yarn outlet 212a and the yarn guide 212b is about 10 cm.

  Such a bobbin case 212 is mounted on the inner hook 205. As a result, the sewing preparation work is completed, and sewing is started thereafter.

  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 13, the heel / lid needle driving mechanism 100 and the cloth feed drive are driven by the rotation of the upper shaft 5. The mechanism 700, the shuttle driving mechanism 220, and the thread drawing driving mechanism 400 are driven. When the hammer / lid needle driving mechanism 100 is driven, the hammer 13 is linearly reciprocated in the vertical direction, and when the cloth feed driving mechanism 700 is driven, the cloth feed mechanism 600 moves the feed dog 601 in four steps of feeding. When driven, the inner hook 205 of the half-rotating hook 200 is rotated forward and backward by half and reversely rotated. When the thread pulling drive mechanism 400 is driven, the thread pulling actuator 401 is swung. Note that the operation of each mechanism has been described in detail in the above description of the configuration, and is therefore omitted.

  The needle 13, the half-turn hook 200, the thread pull-out operator 401, and the feed dog 601 that operate in this way cooperate as described below, and hand stitch stitches on the surface of the workpiece 21 with one sewing thread 20, Lock stitches are formed on the back side.

  In the first stroke of the needle 13 at the beginning of sewing, the needle 13 that reciprocates linearly in the vertical direction descends from the top dead center (upper shaft 5: 0 degrees) and is placed on the needle plate 12 in the first stroke. 21 (FIGS. 10 (A) to (Q), FIG. 11), and when raising from the bottom dead center (upper shaft 5: 180 degrees), the half-turn hook 200 reverses half-turn, so the sewing thread 20 When the sewing needle 13 positioned between the thread outlet 212a and the thread guide 212b is in contact with the collar needle 13 which is located between the thread outlet 212a and the thread guide 212b and the needle thread 13 is raised, the sewing thread 20 is captured by the thread catching collar 13a (see FIGS. 9A to 9). F), FIG. 10 (C)-(H), FIG. 11). In this state, the end portion of the thread 20 coming out from the thread guide 212b is no longer drawn from the thread guide 212b and is not involved in the subsequent sewing work.

  In the second stroke of the needle 13 at the beginning of sewing, the thread 20 drawn from the thread outlet 212a of the bobbin case 212 of the half-turn hook 200 is threaded as shown in FIGS. 8 (C) and 10 (R). It is pulled out by the pulling operation element 401. The inner hook 205 of the half-turn hook 200 is reversely rotated when the hammer needle 13 is lifted from the needle plate 12 and is provided in a direction and a position away from the needle plate 12. As a result, the sewing thread 20 drawn from the thread outlet 212a can be brought into circumferential contact with the heel needle 13 during sewing. Further, the half rotary hook 200 is stopped when the needle 13 moves from the top dead center (upper shaft 5: 0 degrees) to the bottom dead center (upper shaft 5: 180 degrees). The rotation of the half-turn hook 200 in this way is to reverse the half-rotated forward hook half-turn in the second stroke in order to thread the sewing thread 20 onto the thread catching bar 13a of the needle 13 in the first stroke. This is for timing.

  During the first stroke, the heel needle 13 is pulled out of the sewing body 21 and is raised and passes through the top dead center (upper shaft 5: 360 degrees), and the sewing body 21 is pitch-feeded by the first stitch with the feed dog 601 and the sewing thread. Tightening is performed by raising the needle 13 that has captured 20 and rotating the half-rotating hook 200 further in reverse (FIG. 11).

  The half-turn hook 200 stops the half-turn reverse rotation (upper shaft 5: 367 degrees) after the hook needle 13 passes the top dead center (upper shaft 5: 360 degrees) (FIG. 11). When the needle 13 reaches the bottom dead center (upper shaft 5: 180 degrees), the thread pulling operation element 401 starts swinging backward so that the sewing thread 20 can be fed (FIG. 11). The retraction is stopped before passing through (axis 5: 360 degrees) (FIG. 11). The lid needle 14 is configured such that when the eyelid needle 13 moves from the bottom dead center (upper axis 5: 180 degrees) to the upper dead center (upper axis 5: 360 degrees), The thread catching bar 13a is closed and the sewing body 21 is passed along with the barb 13 (FIG. 11). The feed dog 601 starts the 1st stitch pitch feed immediately before the barb needle 13 passes the top dead center (upper shaft 5: 360 degrees) (FIG. 11).

  When the heel needle 13 descends from the top dead center (upper axis 5: 360 degrees) and penetrates the sewing body 21 (FIG. 11) and rises from the bottom dead center (upper axis 5: 540 degrees) in the second stroke. The sewing thread 20 that has been captured by the thread catching bar 13a is scooped by the sword 205a of the half-turn hook 200 that rotates in the forward direction by half rotation, and the sewn thread 20 is released from the thread catching bar 13a by the rotation of the half-turn hook 200. (FIG. 11). In addition, when the hammer 13 moves from the top dead center (upper shaft 5: 360 degrees) to the bottom dead center (upper shaft 5: 540 degrees), the half rotary hook 200 is stopped. In this way, the rotation of the half-turn hook 200 is stopped in order to release the sewing thread 20 hooked on the thread catching bar 13a of the hook 13 in the second stroke from the thread catching bar 13a by the hook point 205a of the hook. This is because it is time to rotate the shuttle that has been rotated half a turn forward in half.

  The half-turn hook 200 starts a half-turn forward rotation when the hammer 13 reaches the bottom dead center (upper shaft 5: 540 degrees) (FIG. 11). The thread pull-out operation element 401 starts swinging so as to retract and feed the sewing thread 20 after the heel needle 13 has pierced the workpiece 21 (FIG. 11). When the heel needle 13 is lowered from the top dead center and passes through the sewing body 21, the lid needle 14 opens the thread catching ridge 13a of the heel needle 13 (FIG. 11). The feed dog 601 stops the first stitch pitch feed before the heel needle 13 pierces the workpiece 21 (FIG. 11).

  By repeating these steps, hand stitch stitches are formed on the front surface of the workpiece 21 and lock stitches are formed on the back surface.

  Therefore, the sewing thread 20 is surely captured by the thread catching bar 13a of the heel needle 13, and a single thread lock stitch is formed in the space inside 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.

  As described above, according to the single thread lock hand stitch sewing machine of the present invention, the preparatory work for starting the sewing can be performed very easily in a short time, and the thread is reliably captured by the thread catching thread of the heel needle. Pseudo hand stitches called pinpoint / saddle stitches can be sewn.

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 pseudo | simulation hand stitch stitch structure obtained with the single thread lock sewing hand stitch formation method and sewing machine by this invention. 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 perspective view which shows the half rotary hook in the single thread lock sewing hand stitch sewing machine of this invention. It is a disassembled perspective view which shows the half rotary hook in the single thread lock sewing hand stitch sewing machine of this invention. It is explanatory drawing which shows the state which looked at the half rotary hook described in FIG. 5 from the top. (A), (B), (C) is operation | movement explanatory drawing which shows the state which looked at the half rotary hook described in FIG. 5 from the top. It is an operation | movement perspective view 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 an operation | movement perspective view 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 an operation | movement perspective view 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 an operation | movement perspective view 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 an operation | movement perspective view 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 an operation | movement perspective view 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 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. FIG. 7 is an operation explanatory view at the time of sewing after the preparation work is completed, showing a method for forming a single-thread locked hand-stitch for the operation of the single-thread locked hand-stitch sewing machine according to the present invention. It is a motion diagram of a needle, a half-turn hook, a thread pulling actuator, a lid needle and a feed dog.

12 …… Needle plate 13 …… 鉤 needle 13a …… Thread catch 鉤 20 …… Sewing thread 21 …… Sewed object 100 …… 鉤 needle / lid needle drive mechanism 200 …… Half-turn hook 202 …… Outer hook 205 …… Inner hook 205a …… Sword tip 211 …… Bobbin 212 …… Bobbin case 212a …… Thread outlet 212b …… Thread guide 401 …… Thread withdrawal actuator 601 …… Feed dog

Claims (3)

A first stroke that descends from the top dead center, passes through the body to be sewn that is placed on the needle plate and is pressed and held by the presser foot, comes out of the body to be sewn from the bottom dead center, rises, and linearly reciprocates in the vertical direction. In the second stroke, the thread is caught when it rises from the bottom dead center, rises from the bottom dead center, and descends from the top dead center in the second stroke, penetrates the sewing body, and the bottom dead center. A hook that is provided with a thread catching rod that releases the captured thread when it is lifted, and a hook that is wound under the needle plate and is pulled out from the thread outlet, In the first stroke, when the needle thread descends from the top dead center, penetrates the sewing object, and rises from the bottom dead center, the thread is threaded along with the raising of the heel needle that has captured the thread by the thread trapping thread. Tighten and move the needle from the top dead center in the second stroke. When the needle penetrates through the sewing body and ascends from the bottom dead center, the hook has a knives that rotates and catches the thread that has been caught by the thread catching rod. A hook which is swung at the tip of the hook by rotation to be released from the thread catching hook, and the released thread is further rotated to pass through the hook and intersect with the thread wound around the hook; A thread pulling-out actuator for tightening the thread pulled out from the hook by the rotation of the hook, and the needle pulling out from the sewing object in the first stroke and passing through the top dead center. The sewing body is fed by one stitch pitch, and the needle is pulled out of the sewing body in the second stroke and lifted to pass the top dead center while the needle is pitched between the first stitches. By providing a feed dog for feeding The surface handstitch of the fabric workpiece, the single-thread locked handstitch sewing machine which forms each JoNui stitches on the back,
The hook has a built-in bobbin case that houses a bobbin around which the thread is wound, and the bobbin case is rotatably mounted on the outer hook together with the inner hook.
The yarn outlet is provided in the bobbin case in a direction and a position where the hook rotates and moves away from the needle plate when the needle needle rises from the needle plate,
Provided in the bobbin case, a yarn guide is arranged adjacent to the yarn outlet in parallel with the rotary axis of the hook,
The yarn as preparation for starting the sewing Upon keep inserted into the yarn capturing open eye of the open eye needle, while the free end of the yarn drawn through the yarn outlet from the bobbin and the yarn guide and the yarn outlet A single-thread locked hand-stitch sewing machine, wherein the thread erected on the thread is forcibly inserted into the thread catching ridge when the heel needle ascends.   2. The needle ascends between the yarn outlet and the yarn guide so as to come into contact with the installed yarn and presses the installed yarn against the needle by rotation of the hook. The single-thread locked hand-stitch sewing machine as described.   2. The single yarn according to claim 1, wherein the yarn outlet and the yarn guide are arranged adjacent to and parallel to the rotary axis of the hook so as to lay the yarn parallel to the rotary axis. Lock sewing hand stitch sewing machine.

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