JP2010213867A - Hand stitch sewing machine for a-single yarn lock sewing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To adjust a presser foot height of a presser foot according to a fabric thickness of an object to be sewn when the object is manually rotated around a crochet needle as the axis of rotation in a hand stitch sewing machine for a-single yarn lock sewing. <P>SOLUTION: The hand stitch sewing machine for a-single yarn lock sewing includes: a rotational operation/linearly feeding changing mechanism 540 which unlocks press-retaining that press-retains the object on a throat plate 12 by the presser foot 501 before a crochet needle lifts down from the upper dead point to penetrate the object through and lifts up from the lower dead point to slip away from the object and helps change a feeding direction of the object to manual rotation making the needle the axis of rotation; and a presser foot height adjusting mechanism 520 for adjusting the presser foot height of the presser foot according to the fabric thickness of the object. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a single-thread locked hand-stitch sewing machine, and in particular, when manually rotating a sewing object with a heel needle as a rotation axis, the amount of presser foot lift according to the cloth thickness of the sewing object. The present invention relates to a single thread lock hand stitch sewing machine that can be adjusted.

  The present applicant has proposed a single-thread locked hand stitch sewing machine suitable for a pseudo hand stitch called a pinpoint / saddle stitch (for example, see Patent Document 1).

Japanese Patent No. 3963939

  Thus, in the single-thread locked hand-stitch sewing machine disclosed in Patent Document 1, before the needle moves down from the top dead center and penetrates the body to be sewn, rises from the bottom dead center and comes out of the body to be sewn. It is possible to manually rotate the sewing object in the feed direction by releasing the pressing and holding of the sewing object on the needle plate and using the heel needle as a rotation axis.

  However, when the manual rotation operation is performed, the presser foot lift amount is set and fixed to the maximum fabric thickness of the sewing object. When the needle moves up from the point, friction between the heel needle and the body to be sewn causes a fabric runaway of the body to be sewn, resulting in a decrease in sewing quality. In addition, when the presser foot lift amount is large with respect to the cloth thickness of the sewing object, there is a problem in that the up-and-down movement of the presser foot is conspicuous on the sewing object and an uncomfortable feeling given to the sewing person occurs.

  The present invention has been made to solve such a conventional problem, and in manually rotating the sewing object with the needle as a rotation shaft, the presser foot of the presser foot according to the cloth thickness of the sewing object. It is an object of the present invention to provide a single-thread locked hand-stitch sewing machine capable of adjusting the rising amount.

  In order to achieve such an object, the single-thread locked hand stitch sewing machine of the present invention descends from the top dead center, penetrates the workpiece to be sewed and placed on the needle plate and held by the presser foot. From the dead 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, When the second stroke descends from the top dead center, penetrates the body to be sewn, and rises from the bottom dead center, there is a hook needle that is provided with a thread catching rod that releases the captured thread, and a lower side of the needle plate. This is a hook in which the thread is wound and the thread is pulled out from the thread exit. When the thread descends from the top dead center in the first stroke, penetrates the sewing object, and rises from the bottom dead center, The thread is tightened as the captured needle rises, and the needle moves to the second stroke. When the needle is lowered from the top dead center, penetrates into the sewing object, and rises from the bottom dead center, the hook has a sword with which the hook rotates and catches the thread that has been caught. When the hook is turned, it is beaten at the hook tip of the hook and released from the thread catching hook, and when the hook is further rotated, the hook is further rotated into the hook and crossed with the thread wound around the hook. The sewing machine pulls out the thread pulled out from the hook by rotating, and the needle is pulled out of the sewing object in the first stroke and lifted to pass the top dead center while the sewing machine is set to the first stitch. In addition to feeding the pitch, the sewing machine is provided with a feed dog that feeds the workpiece to be pitched between stitches while the needle moves out of the workpiece in the second stroke and rises and passes through the top dead center. Hand stitch seam on the front, lock seam on the back Which it is intended to be formed.

  This single-thread locked hand-stitch sewing machine allows the sewing object to be placed on the needle plate before the heel needle descends from the top dead center and penetrates the sewing object and rises from the bottom dead center to escape from the sewing object. Rotating operation / linear feed switching mechanism for releasing the pressing and holding with the presser foot and rotating the sewing body feed direction around the heel needle as a rotation axis, and according to the fabric thickness of the sewing body And a presser lift amount adjusting mechanism for adjusting the presser lift amount of the presser foot.

  In this single-thread locked hand stitch sewing machine, the presser lift amount adjusting mechanism includes a rotation / vertical motion conversion device that imparts a linear reciprocating motion to the presser bar that supports the presser foot from the upper shaft attached to the arm; A press-up amount adjusting device provided in the rotation / vertical motion converting mechanism for adjusting the press-up amount by changing the linear reciprocating stroke of the linear reciprocating motion;

  In this single-thread locked hand-stitch sewing machine, the rotation operation / linear feed switching mechanism performs a rotation operation / linear feed switching of the sewing object by operating / inactivating the presser lift amount adjusting mechanism. It has a dynamic operation / linear feed switching device.

  In this single thread lock hand stitch sewing machine, a pressure adjusting spring that presses the presser against the sewing object with a presser bar, and dial means for adjusting the pressing force of the presser against the sewing object by the pressure adjusting spring; And a pressing force adjusting mechanism.

  According to the single-thread locked hand-stitch sewing machine of the present invention, when the sewing body is manually rotated with the heel needle as a rotation axis, the presser foot lifting amount is adjusted according to the cloth thickness of the sewing body. can do.

1 is an overall perspective view showing a single-thread locked hand stitch sewing machine of the present invention. FIG. 3 is a perspective view showing a presser mechanism including a presser lifting amount adjusting mechanism and a rotation operation / linear feed switching mechanism in the single-thread locked hand stitch sewing machine of the present invention. It is a disassembled perspective view which shows the rotation / vertical motion conversion apparatus in the presser lift amount adjusting mechanism in the single-thread locked hand stitch sewing machine of the present invention. FIG. 3 is an exploded perspective view showing a rotation / vertical motion conversion device and a presser lifting amount adjusting device of a presser lifting amount adjusting mechanism in a single-thread locked hand stitch sewing machine of the present invention. It is a disassembled perspective view which shows the pressing force adjustment mechanism with respect to the to-be-sewn body of the presser foot in the presser mechanism in the single thread lock sewing hand stitch sewing machine of this invention. FIG. 7 is a perspective view showing the operation of the presser lift amount adjusting mechanism and the rotation operation / linear feed switching mechanism in the single-thread locked hand stitch sewing machine of the present invention, in which the presser lift amount is 0 (zero) and linear sewing is possible Indicates. FIG. 6 is a perspective view showing the operation of the presser lift amount adjusting mechanism and the rotation operation / linear feed switching mechanism in the single-thread locked hand stitch sewing machine of the present invention, and shows a state where the presser lift amount is maximum and curve sewing is possible. The operation at the timing when the presser lift amount 0 (zero) setting of the presser mechanism including the presser lift amount adjusting mechanism and the rotation operation / linear feed switching mechanism in the single thread lock hand stitch sewing machine of the present invention is not raised is shown. FIG. The operation at the time of presser lifting of the presser lift amount 0 (zero) of the presser mechanism including the presser lift amount adjusting mechanism and the rotation operation / linear feed switching mechanism in the single-thread locked hand stitch sewing machine of the present invention is shown. FIG. It is a figure which shows the operation | movement at the time of the timing not to raise the presser foot of the presser foot mechanism maximum setting of the presser foot mechanism including the presser foot lift amount adjusting mechanism and the rotation operation / linear feed switching mechanism in the single thread lock hand stitch sewing machine of the present invention. . It is a figure which shows the operation | movement at the time of pressing up of the presser foot maximum amount setting of the presser mechanism including the presser lift amount adjusting mechanism and the rotation operation / linear feed switching mechanism in the single thread lock hand stitch sewing machine of the present invention. . It is a perspective view which shows the needle | hook / lid needle drive mechanism and needle plate structure in the single thread lock sewing hand stitch sewing machine of this invention. It is a perspective view which shows the half rotary hook and hook drive mechanism in the single thread lock sewing hand stitch sewing machine of this invention. It is a perspective view which shows the feed amount setting mechanism, the cloth feed mechanism, and the cloth feed drive mechanism in the single thread lock hand stitch sewing machine of the present invention. It is a perspective view which shows the thread | yarn withdrawal drive mechanism which drives the thread | yarn withdrawal actuator in the single thread lock sewing hand stitch sewing machine of this invention. The sewing object is placed on the needle plate of the single-thread locked hand stitch sewing machine of the present invention, the rotation operation / linear feed switching mechanism is switched to the rotation operation, and the heel needle is lowered from the top dead center to be covered. It is a figure which shows the presser foot lifting state in a bottom dead center which penetrates a sewing body. 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 open It is. (A), (B), (C) is explanatory drawing which shows the pseudo | simulation hand stitch stitch structure obtained with the single thread lock sewing hand stitch sewing machine by this invention. 1 is a motion diagram of a single-thread locked hand stitch sewing machine according to the present invention.

  Hereinafter, a preferred embodiment of a single-thread locked hand stitch sewing machine of the present invention will be described with reference to the drawings.

  As shown in FIGS. 1, 9, and 10, the single-thread locked hand-stitch sewing machine of the present invention has a frame 1 composed of an arm 2 and a bed 3 and a thread catching bar 13 a (FIGS. 11 to 12) on the side. The reed needle 13 is provided to reciprocate linearly in the vertical direction and pierce the sewing thread 20 into the sewing object 21 (FIGS. 11 and 13). The rotary hook 200 is mounted with a thread pulling-out actuator 401 (FIG. 10) for reciprocating and slackening the sewing thread 20 and tightening the seam, and a feed dog 601 for elliptically moving the workpiece 21 and the like. This is a sewing machine in which hand stitch stitches are formed on the surface of the body to be sewn 21 and lock stitches are formed on the back surface by one sewing thread 20 wound around the half-turn hook 200.

  The arm 2 has an upper shaft 5 and an intermediate shaft 8 (FIG. 10), the bed 3 has a horizontal feed shaft 605, a vertical feed shaft 613 (FIG. 9), and a shuttle shaft 201 (FIG. 8). Is installed.

  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 (FIGS. 8 and 9), which are rotatably mounted on the arm 2 b. ing.

  The horizontal feed shaft 605 is installed on the bed 3 by a metal 606 in front of the horizontal feed shaft and a metal 607 after the horizontal feed shaft, and the vertical feed shaft 613 is installed in the bed 3 by a metal 614 in front of the vertical feed shaft and a metal 611 in the rear of the vertical feed shaft. Yes.

  The hook shaft 201 is rotatably mounted on the bed 3 by a hook shaft rear metal 225 and an outer hook mounting portion 202c, and is fixed to an inner hook driver 203 of a half-rotating hook 200 described later (FIGS. 1 and 2). 8, FIG. 11).

  A manual pulley 4 is provided at one end of the upper shaft 5 and is driven by a motor M via a drive belt MB (FIG. 9) which is an endless belt. The motor M is supplied with power from the power supply unit 900.

  Further, the other end of the upper shaft 5 is a counterweight 101 of the eyelid / lid needle driving mechanism 100 that drives the eyelet 13? (FIGS. 1-7) are provided.

  A cloth feed drive mechanism 700 (FIGS. 1 and 9) for driving a cloth feed mechanism 600 that causes the feed dog 601 to move elliptically is connected to the middle of the upper shaft 5.

An upper shaft drive pulley 25 for driving a stitch pitch / inter-stitch pitch feed amount setting mechanism 300, which will be described later, is provided in a portion of the upper shaft 5 near the manual pulley 4 (FIG. 9).
The intermediate shaft 8 has a hook driving mechanism 220 (FIG. 8) for driving the half-turn hook 200 and a thread pulling actuator 40 feed amount setting mechanism 300. The feed amount of the stitch pitch P1 and the stitch pitch P2 (FIG. 13). Fig. 13 (A) shows the case where 1st stitch pitch P1 and 1st stitch pitch P2 of inter-stitch feed are standard feeds. Fig. 13 (B) shows that the 1st stitch pitch P1 is the minimum feed. When the first stitch pitch P2 of the inter-stitch feed is set to the maximum feed, in FIG. 13C, the first stitch pitch P1 is set to the maximum feed and the first stitch pitch P2 of the inter-stitch feed is set to the minimum feed. Shows the case. Note that the configuration of the feed amount setting mechanism 300 is described in detail in Patent Document 1 and is not a feature of the present invention, so detailed description thereof is omitted in the present invention.

  A thread drawing drive mechanism 400 (FIG. 10) for driving 1 is connected.

  The heel needle / lid needle drive mechanism 100 descends the heel needle 13 from the top dead center, penetrates the sewing body 21 placed on the needle plate 12, and comes out of the sewing body 21 from the bottom dead center and moves upward. 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. It 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 through the workpiece 21 and ascending from the bottom dead center (FIGS. 1 and 7-FIG. 7). 11). 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 FIG. 12, the heel needle 13 includes a thread catching ridge 13 a, and when the heel needle 13 penetrates the sewing object 21 and comes out of the lid needle 14 that closes the thread catching ridge 13 a (FIG. 12A), (B)) and functions like a motion diagram shown in FIG.

  As shown in FIGS. 1, 7, and 11, the scissors needle 13 is fixed to a needle holder 107, and the needle holder 107 is capable of linearly reciprocating in the vertical direction, and the lower end of the needle bar 11 installed on the arm 2 a. Further, it is fixed with a needle set screw 108. Also, a needle bar holder is fixed to the needle bar 11 between the needle bar upper metal part and the needle bar lower metal part, and one end of the needle bar crank rod is rotatable about the crank rod pin formed on the needle bar holder. The other end of the needle bar crank rod is connected to a counterweight 101 fixed to the other end of the upper shaft 5 by a crank rod pin. Accordingly, the needle bar crank rod is cranked through the counterweight 101 by the rotation of the upper shaft 5, so that the needle bar 11 with the hook needle 13 fixed by the needle clamp 107 is linearly reciprocated in the vertical direction by the needle bar holder. .

  As shown in FIGS. 1, 2, and 7, a presser mechanism 500 that operates a presser foot 501 for pressing the sewing object 21 against the needle plate 12 is provided in the vicinity of the hook / lid needle drive mechanism 100. ing. The presser mechanism 500 includes a presser foot 502 in which a presser bar 503 is installed on the arm 2a so that the presser bar 503 can linearly reciprocate in a vertical direction, and a presser foot 501 is swingably attached to a lower end portion of the presser bar 503. It is fixed with.

A presser pressure adjusting spring receiver 508 is fitted on the upper part of the presser bar 503, and the presser pressure adjusting spring receiver 508 is pressed by a presser adjusting connector 509 that moves up and down according to a cam lift of a dial 510 installed on the upper part of the arm 2a. The vertical position of the pressure adjustment spring receiver 508 is positioned. A presser bar holder 505 is fixed to the presser bar 503, and a presser pressure adjusting spring 504 is fitted between the presser bar holder 505 and the presser pressure adjusting spring receiver 508.
Further, the pressing force of the presser foot 501 against the workpiece 21 by the presser pressure adjusting spring 504 can be adjusted by turning the dial 510 to adjust the vertical position of the presser pressure adjusting spring receiver 508.

  Further, in order to manually move the presser foot 501 up and down, a presser lifter lever 506 that engages with a locking portion 505a of the presser bar clamp 505 is rotatably provided on a presser lifter lever shaft 507 fixed to the arm 2a. Yes. When the presser lifter lever 506 is raised, the presser lifter cam 506a provided at the upper end of the presser lifter lever 506 pushes up the engaging portion 505a of the presser bar holder 505 to raise the presser bar holder 505, and when it is lowered, the presser bar holder is held. 505 goes down.

  Accordingly, the presser foot lifting lever 506 is raised to create a space between the presser foot 501 and the needle plate 12, and when the sewing body 21 is placed on the needle plate 12, the presser foot lifting lever 506 is lowered to press the sewing body 21. The to-be-sewn material 21 can be set on the needle plate 12 by pressing the needle plate 12 with the gold 501.

  As shown in FIGS. 1 and 9, the cloth feed mechanism 600 feeds the sewing object 21 through the first stitch pitch while the needle 13 is pulled out of the sewing object 21 in the first stroke and is raised and passed through the top dead center. At the same time, a feed dog 601 is provided to feed the sewing target body 21 at a pitch between the first stitches while the needle 13 is pulled out of the sewing target body 21 in the second stroke and is raised and passed through the top dead center.

  As shown in FIGS. 1 and 9, the cloth feed mechanism 600 is provided below the needle plate 12, and the feed dog 601 is fixed to the feed base 602. One end of the feed base 602 is rotatably connected to a horizontal feed arm 604 fixed to one of the horizontal feed shafts 605 by a horizontal feed arm shaft 603. Therefore, when the horizontal feed shaft 605 is reciprocated, the horizontal feed arm 604 is reciprocally swung, so that the feed dog 601 can be reciprocated in the horizontal direction. Further, the other end of the feed base 602 is slidably supported by a vertical feed cam 616 from below. The vertical feed cam 616 is a deformed outer peripheral cam fixed to one end of the vertical feed shaft 613. Therefore, the vertical feed cam 616 can reciprocate the other end of the feed base 602 in the vertical direction by reciprocating the vertical feed shaft 613.

  As shown in FIG. 9, the cloth feed driving mechanism 700 transmits the stitch pitch feed amount and stitch pitch feed amount set by the feed amount setting mechanism 300 (FIGS. 1 and 9) and feeds them. The workpiece 21 is fed by teeth 601, a horizontal feed cam 701 for reciprocatingly rotating the horizontal feed shaft 605 to the upper shaft 5, and a vertical feed cam 717 for reciprocatingly rotating the vertical feed shaft 613 fixed to the upper shaft 5, Is fixed.

  By reciprocally rotating the horizontal feed shaft 605 in this manner, the horizontal feed arm 604 reciprocally swings to reciprocate the feed base 602 in the horizontal direction, and reciprocatingly rotate the vertical feed shaft 613 to reciprocate the feed base 602. The other end is reciprocated in the vertical direction. Accordingly, the feed dog 601 fixed to the feed base 602 can perform a so-called four-step motion of ascending → forward → descending → retreating.

  Next, as shown in FIGS. 1, 8, and 11, the half-rotating shuttle 200 and the shuttle driving mechanism 220 are located below the needle plate 12, the sewing thread 20 is wound, and the sewing thread 20 is pulled out from the thread outlet 212a. The hook 13 is a hook that descends from the top dead center in the first stroke, penetrates the workpiece 21 and rises from the bottom dead center, reverses half turn, and catches the sewing thread 20 with the thread catching rod 13a. The thread 20 is tightened by further reverse rotation as it rises, and when the heel needle 13 descends from the top dead center in the second stroke and penetrates the body 21 to be sewn and rises from the bottom dead center, The hook 20 has a sword 205a that rotates and rotates the half-turn forward of the sewing thread 20 that has been captured by the hook 13a. The hook updates the released sewing thread 20 A mechanism configured to be able to interlace the sewing thread 20 which is wound around the hook put wicket kettle by rotating. Further, when the intermediate shaft 8 rotates, the shuttle drive mechanism 220 causes the shuttle drive triangular cam 230 to move eccentrically, so that the shuttle drive fork 231 moves the shuttle drive vertical rod 228 up and down with the shuttle drive forked shaft 232 as a fulcrum. Therefore, the shuttle drive fan gear 233 pivotally attached to the fan gear shaft 221 fixed to the arm 2b is reciprocally swung. The shuttle shaft 201 to which the shuttle shaft gear 224 is fixed reciprocally rotates at a constant rotation angle based on the reciprocating swing of the shuttle drive fan-shaped gear 233. Half rotation can be reversed.

  Next, as shown in FIGS. 1, 10, and 11, the thread pulling drive mechanism 400 rotates the half-rotating hook 200 when the thread pulling operator 401 captures the sewing thread 20 by the thread catching bar 13 a of the needle 13. By doing so, the sewing thread 20 drawn out from the thread outlet 212a is brought into contact with the heel needle 13 to be tensioned, and the sewing thread 20 that has been pulled out from the half-turn hook 200 can be tightened. In the present specification, “circumferential contact” means that the contact is made around a part where the needle is located. 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.

  As shown in FIG. 10, the thread drawing drive mechanism 400 includes a screw gear 410 (410A, 410B) that converts the rotational motion of the intermediate shaft 8 in the horizontal direction into the rotational motion in the vertical direction, and the screw gear 410 vertically from the horizontal direction. A yarn pulling-out actuator driving cam shaft 408 for transmitting the rotational movement converted into the direction, and a yarn pulling-out actuator driving cam 407 for causing the yarn pulling-out actuator 401 to have the above-described function by the rotational movement of the yarn drawing-out actuator driving cam shaft 408. And.

  As shown in FIG. 1, the single-thread locked hand-stitch sewing machine of the present invention has a thread withdrawal operator 401 (see FIG. 1) before the eyelid needle 13 rises from the bottom dead center in the second stroke and comes out of the sewing object 21. 10) When tightening the excess thread released from 10), the stitches of the two threads caught and suspended by the thread catch 13a when the needle 13 descends from the top dead center in the second stroke In the opposite direction of the needle thread of the two threads that are hooked and pulled up by the hook needle 13, that is, one thread on the side that forms the seam is pulled up and the thread catching hook A thread control mechanism 800 is provided for releasing the pulled-up thread when the hook 200 rotates the trapped thread and the inner hook sword 205a scoops the thread. When controlling the yarn, the yarn control mechanism 800 pulls up the yarn on the side forming the seam from the two yarns caught and suspended by the yarn catching rod 13a and catches it by the yarn catching rod. It has a thread control actuator 801 for releasing the pulled-up thread when the hook 200 rotates and picks up the thread that has been used, and functions as a motion diagram shown in FIG. Note that the configuration of the yarn control mechanism 800 is described in detail in the specification of Japanese Patent Application No. 2009-58515, and is not a feature of the present invention. Therefore, detailed description thereof is omitted in the present invention.

  As shown in FIGS. 1, 2, and 7, a presser mechanism 500 that operates a presser foot 501 for pressing the sewing object 21 against the needle plate 12 is provided in the vicinity of the heel / lid needle drive mechanism 100. Yes. As shown in FIG. 7, the presser mechanism 500 has a presser foot in which a presser bar 503 is installed on the arm 2 a so as to be linearly reciprocable in the vertical direction, and a presser foot 501 is swingably attached to the lower end of the presser bar 503. 502 is fixed with a presser screw 509. A presser pressure adjusting spring receiver 508 is fitted on the upper part of the presser bar 503, and the presser pressure adjusting spring receiver 508 is slidably fitted on the upper part of the arm 2a. A presser bar holder 505 is fixed to an intermediate portion of the presser bar 503, and a presser pressure adjusting spring 504 is fitted into the presser bar 503 between the presser bar holder 505 and the lower surface of the presser pressure adjusting spring receiver 508.

  A spacer 513 is fitted in the two elongated holes 509d of the presser adjusting connector 509 in the screw hole 119e of the lid needle drive cam plate 119 (FIGS. 3B and 3C) fixed to the arm 2a. The presser adjusting connector 509 is fixed with screws so as to be slidable up and down.

  Further, a dial shaft 511 is fixed to the upper end arm portion of the lid needle driving cam plate 119, and a center hole dial 510a of the dial (dial means) 510 is fitted and stopped by an E ring. A pressing force adjustment cam 510b is provided on the inner side of the dial 510 on the side of the lid needle drive cam plate 119, and the cam follower 509b of the presser adjustment connector 509 comes into contact therewith. A rotation stop 510d for setting pressure by operating the dial is provided outside the dial 510, and the dial 510 is set and positioned by a ratchet spring 512 fixed to the arm portion 119i of the lid needle drive cam plate 119.

  The upper end 509 a of the presser adjusting connector 509 is bent 90 degrees and is fitted into the engaging groove 508 a at the upper end of the presser pressure adjusting spring receiver 508, and the presser adjusting connector 509 follows the lift of the pressing force adjusting cam 510 b according to the setting of the dial 510. By positioning the presser pressure adjusting spring receiver 508 via the presser foot, the presser pressure adjusting spring 504 applies a pressing force to the presser foot 501.

  In this way, the pressure adjusting spring 504 that presses the presser foot 501 against the sewing body 21 with the presser bar 503, and the dial 510 that adjusts the pressing force of the presser foot 501 against the sewing target body 21 by the pressure adjusting spring 504. A pressing force adjusting mechanism 500a is configured.

  The pressing force of the presser foot 501 against the workpiece 21 by the presser pressure adjusting spring 504 can be adjusted by turning the dial 510 to adjust the vertical position of the presser pressure adjusting spring receiver 508 of the pressing force adjusting mechanism 500a.

  Further, in order to manually move the presser foot 501 up and down, a presser lifter lever 506 that engages with a locking portion 505a of the presser bar clamp 505 is rotatably provided on a presser lifter lever shaft 507 fixed to the arm 2a. Yes. When the presser lifter lever 506 is raised, the presser lifter cam 506a provided at the upper end of the presser lifter lever 506 pushes up the engaging portion 505a of the presser bar holder 505 to raise the presser bar holder 505, and when it is lowered, the presser bar holder is held. 505 goes down.

  Accordingly, the presser foot lifting lever 506 is raised to create a space between the presser foot 501 and the needle plate 12, and when the sewing body 21 is placed on the needle plate 12, the presser foot lifting lever 506 is lowered to press the sewing body 21. The to-be-sewn material 21 can be set on the needle plate 12 by pressing the needle plate 12 with the gold 501.

  Further, as described above, the presser pressure adjusting spring receiver 508 is fitted to the upper part of the presser bar 503, and the presser pressure adjusting spring receiver 508 moves up and down according to the cam lift of the dial 510 installed on the upper part of the arm 2a. The vertical position of the presser pressure adjusting spring receiver 508 is positioned by the presser adjusting connector 509. A presser bar holder 505 is fixed to the presser bar 503, and a presser pressure adjusting spring 504 is fitted between the presser bar holder 505 and the presser pressure adjusting spring receiver 508. Further, the pressing force of the presser foot 501 against the workpiece 21 by the presser pressure adjusting spring 504 can be adjusted by turning the dial 510 to adjust the vertical position of the presser pressure adjusting spring receiver 508.

  Further, in order to move the presser foot 501 up and down, a presser lifting lever 506 that engages with a locking portion 505a of the presser bar holding 505 is rotatably provided on a presser lifting lever shaft 507 fixed to the arm 2a. When the presser lifter lever 506 is raised, the presser lifter cam 506a provided at the upper end of the presser lifter lever 506 pushes up the engaging portion 505a of the presser bar holder 505 to raise the presser bar holder 505, and when it is lowered, the presser bar holder is held. 505 goes down.

  As shown in FIGS. 1, 2, 3 (A), 3 (B), and 11, the single-thread locked hand-stitch sewing machine has a sewing machine 21 in which the heel needle 13 is lowered from the top dead center. Before being lifted from the bottom dead center and coming out of the sewing body 21, the pressing and holding of the sewing body 21 with the presser foot 501 on the needle plate 12 is released and the feeding direction of the sewing body 21 is released. Against a rotation operation / linear feed switching mechanism 540 for manual rotation operation with the heel needle 13 as a rotation axis, and a presser pressure adjusting spring 504 serving as a pressing force of the presser foot 501 against the sewing object 21. A presser lift amount adjusting mechanism 520 for adjusting the presser lift amount of the presser foot 501 according to the cloth thickness of the sewing body 21 is provided.

  In this single-thread locked hand stitch sewing machine, the presser lift adjustment mechanism 520 performs linear reciprocating motion from the upper shaft 5 attached to the distal end arm portion 2a of the arm 2 to the presser bar 503 that supports the presser foot 501. A rotation / vertical motion converting device 520a to be applied, and a presser lifting amount adjusting device 520b provided in the rotation / vertical motion converting mechanism for adjusting the amount of press-up by changing the linear reciprocating stroke of the linear reciprocating motion.

  As the rotation / vertical motion conversion device 520a, the upper shaft 5 is fixed with a presser lift cam 528, and the presser lift cam 528 is fixed to the presser lift drive shaft 526 and swings a presser lift cam follower 527 which is ejected by a spring 529. . A presser lift drive arm 525 is fixed to one end of the presser lift drive shaft 526. The presser lifting drive arm 525 is connected to the link 524 by a pin 532. The other end of the link 524 is coupled to the upper end 521 a of the presser lift link 521 and one end of the presser lift follower link 523 by a pin 531. A pin 530 is fitted into the lower end 521 b of the presser lift link 521 and is fixed to the presser lifter piece 522. For this reason, when the presser lifting drive arm 525 swings, the link 524 moves vertically, whereby the link 521 is moved vertically to give a linear reciprocating motion to the presser bar 503 via the presser lifting piece 522.

  As a presser lift adjustment device 520b, an adjustment ratchet 545 is fitted between the arms of a presser lift adjustment base 541 attached to the tip arm 2a, and the presser lift adjustment dial 542 is adjusted by its shaft 543. The base 541 is rotatably attached. The connecting pin 546 provided on the adjustment ratchet 545 is fitted into the elongated hole 547a of the press-up amount adjusting arm 547, the press-up amount adjusting arm 547 is fixed to one end of the press-up amount adjusting shaft 548, and the other end is pressed up. The amount adjusting arm 549 is fixed, and the other end of the presser lifting amount adjusting arm 549 and the other end of the presser lifting follower link 523 are connected by a pin 533.

  Therefore, the press-up amount adjustment arm 547 is fixed to the other end of the press-up amount adjustment arm 547 by the adjustment ratchet 545 and the long hole 547a of the press-up amount adjustment arm 547 according to the rotation of the press-up amount adjustment dial 542. The position of the presser lifter follower link 523 that is coupled to the presser lifter adjustment arm 549 by the pin 533 varies. That is, the movement starting point at which the presser lifter follower link 523 is coupled with the other end of the presser lift amount adjusting arm 549 by the pin 533 and swings by the linear reciprocating motion of the link 524 changes, and the presser lifter follower link 523 swings in the vertical direction. When moving, the vertical momentum increases, and when the presser lifter follower link 523 swings in the horizontal direction, the vertical momentum decreases. As a result, the upper end 521a of the presser foot lifting link 521 adjusts the amount of vertical motion by changing the swinging direction of the linear reciprocating motion by the link 524. That is, the amount of press-up is adjusted by changing the rotational motion of the upper shaft 5 to a vertical reciprocating motion.

  In this single-thread locked hand stitch sewing machine, the rotation operation / linear feed switching mechanism 540 is configured to operate / inactivate the presser lift amount adjusting mechanism 520 to switch the rotation operation / linear feed switching of the sewing object 21. Rotation operation / linear feed switching device 540a for performing.

  As the rotation operation / linear feed switching device 540a, an adjustment ratchet 545 is fitted between the arms of the press-up amount adjustment base 541 attached to the tip arm portion 2a, and the press-up amount adjustment dial 542 is pressed by the shaft 543. It is rotatably attached to the rising amount adjustment base 541. The connecting pin 546 provided on the adjustment ratchet 545 is fitted into the elongated hole 547a of the press-up amount adjusting arm 547, the press-up amount adjusting arm 547 is fixed to one end of the press-up amount adjusting shaft 548, and the other end is pressed up. The amount adjusting arm 549 is fixed, and the other end of the presser lifting amount adjusting arm 549 and the other end 523a of the presser lifting follower link 523 are coupled by a pin 533, and the presser lifting link 521 coupled to one end 523b of the presser lifting follower link 523. The presser bar 505 is pivotally attached to the lower end 521b of the presser bar 522 by the pin 530 and fixed to the intermediate part of the presser bar 503. A predetermined clearance S is provided before the presser bar holder 505 is pushed up.

  When the amount of rotation by the press-up amount adjustment dial 542 exceeds the predetermined clearance S, the presser bar holder 505 is pushed up, and the press-up amount adjustment mechanism 520 is operated so that the sewing workpiece 21 can be rotated. If it is within the predetermined clearance, the presser bar holder 505 is not pushed up, and the presser lift amount adjusting mechanism 520 does not raise the presser foot, and the workpiece 21 is linearly fed.

  For this reason, the rotation operation / linear feed switching mechanism 540 can perform the rotation operation / linear feed switching of the sewing body 21 by operating / inactivating the press-up amount adjusting mechanism 520.

  Hereinafter, the operation of the presser lifting amount adjusting mechanism 520 will be described with reference to FIGS. 6 (A), (B), (C), and (D).

  FIG. 6A shows an operation at a timing when the presser lift amount 0 (zero) setting of the presser mechanism including the presser lift amount adjusting mechanism and the rotation operation / linear feed switching mechanism is not set.

The position of the pin 533 that is the movement base point of the presser lifter follower link 523 is located at the lowermost position.
In the upper shaft 5, the presser lifting drive arm 525 swings downward while the presser lifting cam 528 does not lift the presser lifting cam follower 527. In this state, the link 524 is transmitted so as to swing the presser lifter driven link 523 to the right by driving from the cam. As a result, the link 521 lowers the presser lifting piece 522 to the lowermost position, and the presser foot 501 presses the workpiece 21.

  FIG. 6B shows the operation at the timing when the presser foot lift amount is set to 0 (zero) of the presser mechanism including the presser lift amount adjusting mechanism and the rotation operation / linear feed switching mechanism.

The position of the pin 533 that is the movement base point of the presser lifter follower link 523 is located at the lowermost position.
In the upper shaft 5, the presser lifting drive arm 525 swings upward while the presser lifting cam follower 527 lifts the presser lifting cam follower 527. In this state, the link 524 transmits the presser lifter follower link 523 so as to swing horizontally by driving from the cam. As a result, the amount of vertical movement is reduced, and the link 521 slightly raises the presser foot 522, but the presser foot 501 keeps pressing the workpiece 21 less than the predetermined clearance S amount.

  FIG. 6C shows an operation at a timing when the presser lift amount is not set to the maximum presser lift amount setting of the presser mechanism including the presser lift amount adjusting mechanism and the rotation operation / linear feed switching mechanism.

The position of the pin 533 that is the movement base point of the presser lifter follower link 523 is located at the uppermost position.
In the upper shaft 5, the presser lifting drive arm 525 swings downward while the presser lifting cam 528 does not lift the presser lifting cam follower 527. In this state, the link 524 transmits the presser lifter follower link 523 so as to swing vertically downward by driving from the cam. The link 521 lowers the presser lifting piece 522 to the lowermost position, and the presser foot 501 presses the workpiece 21.

  FIG. 6D shows the operation at the timing when the presser foot is lifted at the maximum presser foot lift amount setting of the presser mechanism including the presser lift amount adjusting mechanism and the rotation operation / linear feed switching mechanism.

The position of the pin 533 that is the movement base point of the presser lifter follower link 523 is located at the uppermost position.
The upper shaft 5 transmits the presser lifter drive arm 525 so that the presser lifter follower link 523 swings in the vertical upward direction while the presser lifter cam 528 pushes up the presser lifter cam follower 527. . In this state, the link 524 transmits the driving force from the cam so as to swing the driven link 523 vertically upward. As a result, the amount of vertical movement increases, and the link 521 raises the presser foot 522 greatly beyond the amount of the predetermined clearance S, and the presser foot 501 releases the press without pressing the sewing body 21.

  According to the single-thread locked hand stitch sewing machine of the present invention configured as described above, each mechanism functions as shown in the motion diagram of FIG. The hand stitch seam and the lock seam (FIGS. 13A, 13B, and 13C) can be formed on the back surface.

  According to the single-thread locked hand stitch sewing machine of the present invention configured as described above, a single stitch is locked to form hand-stitched stitches on the surface of the workpiece, and lock stitches on the back surface. In order to manually rotate the sewing object with the heel needle as the pivot, adjust the amount of presser foot lift according to the fabric thickness of the sewing object to form a beautiful seam by curvilinear stitching. Can do.

2 ... Arm 2a ... Arm (tip arm)
2b …… Arm (base arm)
5 ... Upper shaft 12 ... Needle plate 13 ... Needle needle 13a ... Thread catching rod 14 ... Lid needle 20 ... Sewing thread 21 ... Sewing object 100 ... Needle needle / lid needle drive mechanism 200 ... Half-turn hook 205a …… Sword tip 212a …… Thread outlet 401 …… Thread pulling actuator 500a …… Pressing force adjusting mechanism 501 …… Presser foot 503 …… Presser bar 504 …… Pressure adjusting spring 510 …… Dial (dial means)
520... Presser lifting amount adjustment mechanism 520a... Rotation / vertical motion conversion device 520b... Presser lifting amount adjustment device 540... Rotation operation / linear feed switching mechanism 540a. Feed dog

Claims (4)

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 sewing needle is pressed by the presser foot on the throat plate before the heel needle descends from the top dead center and penetrates the sewing body and rises from the bottom dead center and comes out of the sewing body. A rotation operation / linear feed switching mechanism for releasing the pressure holding and rotating the sewing body in the feeding direction with the heel needle as a rotation axis, and according to the cloth thickness of the sewing body A single-thread locked hand stitch sewing machine comprising a presser lift amount adjusting mechanism for adjusting the presser lift amount of the presser foot.   The presser lift amount adjusting mechanism is provided in a rotation / vertical motion conversion device that imparts a linear reciprocating motion to a presser bar that supports the presser foot from an upper shaft attached to an arm, and the rotation / vertical motion conversion mechanism. The single-thread locked hand-stitch sewing machine according to claim 1, further comprising a press-up amount adjusting device for adjusting the press-up amount by changing a linear reciprocating stroke of the linear reciprocating motion.   The rotation operation / linear feed switching mechanism includes a rotation operation / linear feed switching device that performs a rotation operation / linear feed switching of the sewing object by operating / inactivating the press-up amount adjusting mechanism. The single-thread locked hand-stitch sewing machine according to claim 1 or 2.   A pressure adjusting mechanism having a pressure adjusting spring that presses the presser against the sewing body with the presser bar, and dial means for adjusting the pressing force of the presser against the sewing body by the pressure adjusting spring. A single-thread locked hand-stitch sewing machine according to claim 2 or claim 3, characterized by comprising:

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