JP2013039269A - Intermittent stitch sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intermittent stitch sewing machine in which a loose loop for shuttle rotation formed on a needle thread is made only by downward oscillation of a drag thread take-up lever by a single cam body at a position of a bed lower part.SOLUTION: In an intermittent stitch sewing machine, a cam body 7 for oscillation of a drag thread take-up lever 9 is disposed on a driving shaft 6 of a bed lower part 5 for receiving the rotation of a main shaft of a sewing machine main body, and the cam body 7 is formed so that a first cam part 8a for initially feeding a needle thread (a) and a second cam part 8b for feeding a loop are continued in an endless cam groove 8. When the needle thread fed by predetermined oscillation of the drag thread take-up lever 9 is transferred to a bed upper part by a descending sewing needle, and is returned after adding a predetermined seam, the drag thread take-up lever 9 further pulls downward the needle thread (a) by additional downward oscillation in responce to the movement of the second cam part 8b, and stops the pulling at the end of the cam to form a loose loop by the loosened needle thread (a).

Description

  The present invention relates to a intermittent stitch sewing machine that performs stitch sewing using a main sewing machine of a lower scale, and more particularly to an intermittent stitch sewing machine that can perform stitch sewing on various fabrics from thin fabrics to special thick fabrics such as clothing. is there.

  2. Description of the Related Art Currently, as an intermittent stitch sewing machine that is generally used, there is known a sewing machine device that performs stitch sewing at a predetermined sewing position or decoration portion in a clothing relationship such as women's clothing, men's clothing, and a coat. In this case, the fabric used for stitch sewing is mainly a thin fabric with a relatively small load on the sewing machine itself, its needles, threads and the like. For this reason, for example, stitches on thick fabrics (special fabrics) with cushioning materials etc. on one side or in the middle, such as furniture surfaces such as chairs and sofas, automobile seats and interior parts, are formed on the upper thread. The slack loop for rotating the kama, which is entangled with the lower thread, will not be able to rotate smoothly unless it is increased by the thickness of the fabric, and stitch sewing to a thick fabric will not be possible with a conventional sewing machine.

  Especially in the case of so-called square stitches that bend appropriately from straight stitch stitches due to the use of thick fabric, etc., the fabric itself must be properly swayed, and the presser foot, etc., will become sweet and the threaded needle of the sewing needle that descends accordingly. The upper thread tightening and loose stitching caused by this are easy to invite. In addition, because the thread used is thicker in thick ground, the upper thread itself that leads from the thread winding to the lower balance is also likely to have a thread curl, and the curly thread appears as a twisted ball or appears on the fabric surface. The two yarns that come out of the line are also not aligned and overlapped (not parallel), reducing the commercial value. Therefore, the stitch sewing to the thick fabric is forced to use a special sewing machine dedicated to the thick fabric, and is still one of the problems of the stitch stitch sewing machine.

  Here, the intermittent stitch sewing machine used in a sewing factory or the like includes, for example, a sewing machine (see Japanese Patent Publication No. 58-357) having a stitch mechanism that is sewn using a normal thread using a needle with a hook. For example, there is an intermittent stitch sewing machine (see JP-A-2006-68380) presented by the present applicant. However, in the former sewing machine with a special stitch mechanism, continuous stitch stitching cannot be performed because the upper thread from the bobbin is cut in a predetermined length by the thread trimming device provided in the apparatus in advance. The latter intermittent stitch sewing machine is a bottom-stitched, main-stitch sewing machine whose appearance is simplified. The upper thread that is fed out by the operation of the lower balance of the bed, the looper thread hole that faces the lower surface of the needle plate with a predetermined intermittent movement To the upper part of the bed after passing through a predetermined fabric with a raising and lowering needle, and forming a loop for rotating the kama by hooking the upper thread on a hooking claw that descends separately. Is returned to the lower part of the bed and hung on a rotary device which rotates downward, and the predetermined thread rotation of the lower thread is performed, and stitch sewing is performed with the non-lower thread entanglement of the upper thread which does not reach the needle drop position.

  The fabric used for these sewing machines is mainly thin and has a thin thread. The stitch sewing operation for thick ground is basically the same as for thin ground. However, since the slack loop for rotating the kama formed on the upper thread is formed by hooking the upper thread at the top of the bed, if the lowering position of the hooking nail is preset for thin ground, use heavy ground. Then, the lower end of the descending hooking nail first touches the edge of the fabric, and the needle does not reach the upper thread that sews the fabric, and the upper thread cannot be hooked.

  In addition, the support mechanism between the table base (leg table) and the sewing machine main body in the conventional sewing machine is such that the peripheral edge of the base of the sewing machine main body is fitted and placed in the fitting groove hole for setting arranged on the table base surface. A support shaft (hinge shaft) projecting at the (front corner position) is fitted into a bearing portion disposed at one corner of the fitting groove hole portion, and the sewing machine body can stand up (turn 90 degrees) freely. If necessary, the main body is laid down so that bobbin replacement and machine inspection can be easily performed by exposing the bottom surface. However, the projecting position of the support shaft up to now is at one corner g farthest from the center of gravity line of the sewing machine body (see B in FIG. 8), and exhibits a kind of single-support structure. When moving, the total load of the sewing machine body is applied to the support shaft and is not easy. Therefore, it is one of the troublesome work for women and women who often handle sewing machines.

  Furthermore, the corner stitching part of a conventional stitch sewing machine does not continue the corner seam simply by turning the fabric and changing the sewing direction, one side is the stitch and the other is the stitch gap, and the corner stitch is missing between the sections. And reduce the product value.

Japanese Patent Publication No.58-357 JP 2006-68380 A

  That is, the intermittent stitch sewing machine is a main sewing machine of the lower scale, and more specifically, the balance cam is halved by rotating the upper shaft of the sewing machine main body to 1/2 and further rotating to the drive shaft below the interlocking bed. This is a link mechanism for two looper interlocking rods with different speeds that swings the lower balance through the swing lever to feed the upper thread according to the cam displacement of the cam body and feeds the upper thread separately from the drive shaft. The thread hole of the looper device part that performs the intermittent motion to draw the figure 8 locus is caused to face a predetermined needle drop position on the lower surface of the needle plate. In addition, the upper part of the bed is provided with an elevating rod with a loop hooking claw that halves the rotation of the upper shaft of the sewing machine body, and a horizontal swing mechanism that interlocks with the elevating rod by halving the rotation of the upper shaft is also incorporated. The auxiliary balance device unit is a thread loop and loop remover unit, and further includes a needle support device unit with a sewing needle that moves up and down from the upper shaft via a crank mechanism, which makes a complicated device. Therefore, it is not easy to handle and maintain the sewing machine at the time of stitch sewing, which is troublesome.

  In addition, the biggest problem with the seam sewing machine is the slack loop for rotating the kama formed on the upper thread as described above. Since this slack loop is made only by hooking the upper thread at the upper part of the bed to the lowering hook claw, it requires an auxiliary balance device with a hooking hook with a complicated mechanism at the upper part of the bed. Is also limited to thin areas, and there is no use of anything other than a predetermined fabric (such as thick areas).

  In a sewing factory or the like, the fabric used may be switched from thin to heavy for convenience of the sewing process. However, with the use of conventional sewing machines, the loop formation of the upper thread led to regulation of the fabric thickness because the upper thread transferred to the bed was hooked directly onto the hook. This loop formation does not directly hook the upper thread on the bed, but the swinging of the balance when the upper thread returns to the lower part of the bed is increased, and even if the upper thread is pulled largely to the lower position of the bed, the same loop feeding You can also. This also enables stitch sewing that is not subject to fabric thickness restrictions.

  In this case, the swing of the balance may be improved by a cam body of a cam mechanism disposed on the balance base. The cam part of this cam body has a multi-stage shape in which the upper thread initial feeding cam part and the cam rotation loop cam part are continuous, and the upper thread is pulled at the lower part of the bed, so that the loop that is conventionally performed at the upper part of the bed The molding process is omitted. As a result, there is no regulation on the thickness of the fabric, and attention is paid to the fact that the above-mentioned problems can be solved at once, and the stitch sewing machine corresponding to various fabrics is reached through repeated experiments.

  In the present invention, in view of the above circumstances, the cam body of the cam mechanism of the lower balance is a multi-stage cam body that feeds the upper thread downward stepwise, and the upper thread is moved by the swing of the balance by the first cam portion. When the thread hole of the looper unit that moves intermittently faces the lower surface of the needle plate, the balance moves to the upper part of the bed with a sewing needle, and when returning with a predetermined seam, the balance further swings downward in the second cam part. Then, the upper thread is largely pulled back to the lower part of the bed to feed out the loop, which is directly rotated by a hook, and an object is to provide an intermittent stitch sewing machine that performs stitch sewing on various fabrics that solve the above problems.

  The present invention relates to a cam mechanism for a balance that is connected to a drive shaft at the bottom of the bed that halves the rotation from the upper shaft of the sewing machine body, a lower balance that swings with a cam body of the cam mechanism, and the drive shaft. The looper device part where the looper thread hole faces the lower surface of the needle plate by the intermittent movement that draws the 8-shaped locus with the link mechanism of two more branched interlocking hooks for loopers with different speeds, and linked separately from the drive shaft A bobbin-equipped semi-rotating type hook and a bobbin thread kama device unit equipped with a driver unit and a predetermined lining feed mechanism that operates in conjunction with the drive shaft are arranged, and a predetermined accessory needle that operates in conjunction with the upper shaft of the sewing machine main body A sewing needle mechanism, cloth feeder and presser foot are arranged, and the upper thread at the bottom of the bed is guided to the looper thread hole at the needle drop position by swinging the balance, and this is passed through the fabric with the sewing needle to the top of the bed. Transition to the specified seam and form a tension loop as needed Return to the lower part of the thread, hook the upper thread loop around the hook device, and rotate the stitches where the lower thread is entangled and the upper thread escape where the lower thread does not entangle with the above-mentioned needle drop position. In the intermittent stitch sewing machine, the cam mechanism of the cam mechanism of the lower scale balance is a disc-shaped multistage cam body in which an upper thread initial feeding first cam part and a loop feeding second cam part are continuously formed in an endless cam groove, , The upper thread that is fed by the first cam part swinging the balance downward, and the looper part thread hole that moves the needle thread for a predetermined period of time. When returning to the lower part of the attachment bed, the balance has an additional thread feeding mechanism with an upper thread secondary feeding mechanism that swings further downward at the second cam part and pulls the upper thread largely to the lower part of the bed. Lower swing width is the upper part of the bed The upper thread loop feed length that leads to the vicinity of the rotation of the hook as well as the tension against the looseness caused by the return of the upper thread, and the slack loop where the cam portion ends and the tension is loosened when the hook device is hooked on the upper thread. The loop is hooked on the hook device portion, the lower thread is entangled, and stitches are sewn with the upper thread not entangled with the lower thread not facing the needle drop position.

  A square stitching mechanism is connected to a movable second fulcrum shaft via a feed adjustment lever on a first fulcrum shaft facing a seam dial arranged on a bifurcated rod of a horizontal feed shaft for lining, and a predetermined predetermined value is connected to the second fulcrum shaft. A feed pulse motor that operates in response to a corner sewing signal is appropriately connected by an interlocking member, and the feed adjustment lever is moved in conjunction with the driving of the pulse motor to change the second fulcrum shaft position to change the stitch feed amount.

  The thread tension of the upper thread is arranged with a pair of tension plates at a predetermined interval in the front part of the slide type support shaft part, and a thread loosening solenoid that is caused by a sewing end signal is attached to the rear end of the support shaft part, The support shaft is slid by the operation of the solenoid to widen the distance between the two trays.

  The upper thread bobbin attaching means has a double-supported shaft structure in which a hollow guide shaft portion with a long-shaft thread hole for setting a bobbin thread is fitted to a short-shaft hollow fixed support shaft projecting horizontally outward from the lower part of the machine body, An inclined guide rod is disposed on the support leg portion at the lower part of the machine body to which the hollow fixed support shaft is attached.

  The support mechanism of the sewing machine main body placed on the table base is a projecting projection in which the support shaft protruding from one corner of the sewing machine body base is appropriately shifted from the position of one side of the sewing machine main body to the center of gravity line of the sewing machine main body. The bearing portion of the table base fitting groove that receives the support shaft is also configured to be opposed to the same position, so that the support point of the sewing machine body as a whole is shifted to the center of gravity line side of the sewing machine body.

  In this way, the intermittent stitch stitching machine of the present invention has a cam body of a cam mechanism that swings the lower balance, a multi-stage cam in which the first cam portion for initial feeding of the upper thread and the second cam portion for loop feeding are continuous. The upper thread of the balance that swings due to the cam displacement of the first cam part is guided to the thread hole of the looper device part facing the needle drop position where it moves for a predetermined period of time, and the predetermined fabric is fed by raising and lowering the sewing needle. After that, when moving to the upper part of the bed and returning to the needle together with the seam, the balance receives the second cam part of the next stage and swings further downward to prevent the upper thread from loosening due to the return of the sewing needle. Pulling greatly downward, the cam portion ends in the vicinity of the rotation of the hook, and the upper thread tension is loosened, and the slack is defined as a predetermined loop. After that, the loop is hooked on the rotary device unit that rotates downward to rotate it for a predetermined time, and stitch sewing is performed with the upper thread in a state where the lower thread that does not reach the needle drop position is not entangled.

  In other words, the slack loop for rotating the kama formed on the upper thread is not a conventional method in which the upper thread is hooked with a separate hooking claw at the upper part of the bed, but the upper thread on the upper part of the bed is used together with the sewing needle. When returning to the lower part, the balance is greatly swung downward by the second cam part, and the upper thread is pulled to a predetermined position at the lower part of the bed without loosening due to the return of the upper thread, and this tension is loosened at the end of the cam to loosen the loop. To do. Basically, the upper thread can be fed by a combination of a single balance and a cam body having two cam portions. The balance is swung downward stepwise according to the displacement of the two cams, and When returning to the lower part of the bed, the upper thread is pulled downward to a predetermined position to form a loop, which can be immediately rotated to form a simple upper thread feeding mechanism.

  Next, it is also possible to continue the stitches at the corner stitches which are problematic in stitch stitching. A movable second fulcrum shaft is connected via a feed adjustment lever to the first fulcrum shaft that is the center of the upper shaft where the fixed seam dial faces the bifurcated lot connected to the lining horizontal feed shaft. The feed pulse motor that operates in response to a predetermined angle sewing signal is interlocked with a connecting member, and the second fulcrum shaft that moves the bifurcated rod up and down is always square-sewn with the position shifted from the axis of the first fulcrum shaft. In accordance with the rotation of the motor shaft of the pulse motor, the shaft moves to the axis of the first fulcrum shaft, the bifurcated rod is simply swung, the cloth feed amount becomes zero, and both-side seams are continuous.

  In addition, the thread tension for the upper thread has a pair of tension plates arranged at a predetermined interval on the slide type support shaft portion, and a thread loosening solenoid is continuously provided at the rear end of the support shaft portion. Operate the solenoid, slide the support shaft with the protrusion of this operating shaft, shift the interval between the two tension plates against the holding spring as appropriate, widen the interval between the tension plates and automatically hold the upper thread loosen.

  In addition, the bobbin mounting means has a robust double support shaft structure by inserting a long hollow guide shaft portion to be wound on a short hollow fixed support shaft that is horizontally projected outward from the machine body. Since the thread is inverted and inserted into the thread guide at the tip of the hollow guide shaft, penetrates the concentric hollow fixed support shaft, is led out from the mounting base end at the bottom of the machine body, and is guided to the anti-twisting piece at the upper end of the inclined guide rod. Even if there is a yarn twist in the yarn, the twist is gradually guided to the double support shaft, the direction is changed, and the tension and the ironing are sequentially performed, and the yarn twist is gradually released to become a straight yarn and discharged to the yarn tension.

  Furthermore, the support mechanism of the sewing machine main body placed on the table base is shifted so that the supporting shaft positions protruding on both sides of the sewing machine main body are appropriately shifted in width from the conventional far-off one corner position to the center of gravity line side of the sewing machine main body. Since the bearing part on the table base side is also opposed to the same position to make the center of gravity moving support mechanism, the main body load on the support shaft is shifted to the center of gravity line side of the main body when the sewing machine body is standing up and turning, etc. As a result, a kind of lever action is reduced and the rotation of the main body becomes easy.

  As described above, the intermittent stitch sewing machine of the present invention is the intermittent stitch sewing machine of the lower scale, and the cam body of the cam mechanism that swings the balance is a multi-stage cam body with two cam portions, and the upper thread by the balance. When the first cam part is guided to the thread hole of the looper device part in the cam part, the second cam part works on the balance and moves to the upper part of the bed with the sewing needle and the seam is returned. The upper thread is forcibly pulled to the lower part of the bed, and the upper thread that stops and loosens at the end of the cam displacement is the loop. In other words, the upper thread slack loop required for stitch sewing is only a swing of the balance at the lower position of the bed, and it is simple without the auxiliary balance device with a special hooking claw at the upper part of the bed as in the past. Also, it is not subject to fabric thickness restrictions due to hooking nails. Therefore, the stitch-stitched fabric can correspond from a thin fabric to a special fabric (thick fabric) with a cushion material or the like, which is a gospel for those skilled in the art.

  The shape of the cam body may be a single cam body in which two cam parts are connected to the endless cam groove around the cam body, and a cam that does not malfunction by simply combining the balance-side actuator in this cam groove. Get transmission. In addition, the cam groove may be a simple shape carved on one side of the disc-shaped cam body, which is easy to manufacture and suitable for mass production. In particular, even if there is a change in the material thickness or thread diameter to be used, fine adjustment of the cam groove is sufficient, and from this point of view, a cam body that can be handled well is obtained.

  Of course, the balance is suitable for a sewing machine in which two cam portions are continuously swung downward and high speed rotation is desired. In addition, when the upper thread returns from the upper part of the bed to the lower part of the bed, the balance only has to be pulled further downward, there is no special feeding mechanism, and the pull is automatically loosened at the end of the cam part to form a predetermined loop. In addition, smooth stitch sewing is obtained without affecting the operation of the sewing needle itself.

  Further, in order to continue stitches on both sides desired for square stitching by stitch stitching, the movable second fulcrum shaft is connected via a feed adjustment lever to the first fulcrum shaft facing the stitch dial arranged on a predetermined bifurcated rod. The second fulcrum shaft is linked to a separate feed pulse motor that operates with a predetermined angle sewing signal, and the second fulcrum shaft is shifted to the center line of the first fulcrum shaft, which is the center of the upper shaft. In the second place, the seams on both sides are easily continuous, increasing the product value.

  In addition, the thread tension is provided with a solenoid that works in response to a sewing end signal at the end of the slide type support shaft portion where the two tone plates are arranged, and the solenoid is actuated to push the support shaft portion and automatically widen the interval between the two tone plates. Easy thread removal at the end of sewing. In addition, the support mechanism of the sewing machine body with respect to the sewing machine table is a center-of-gravity moving support mechanism in which the support shaft arranged at the corners of the sewing machine body is appropriately shifted to the center of gravity line side of the sewing machine body. The load is reduced by the center of gravity shift width, easy to rotate, and good news for women and women who often handle sewing machines.

  In addition, the bobbin mounting means is a double support shaft by fitting a long shaft hollow guide shaft portion that sets the bobbin on a horizontally fixed hollow fixed support shaft, and the upper thread of the bobbin is fixed concentrically from the tip of the hollow guide shaft portion. Since it is inverted and inserted into the support shaft and guided from the fixed end on the machine body through the inclined guide rod to the twisting piece, even if the upper thread is twisted, there is a combination of stepwise direction change and tension to the support shaft. As a result, the twists are sequentially unwound and turned into a straight thread, and a good finish is obtained without inducing a thread or the like on the stitched surface.

It is a front view of the principal part which shows the Example of the intermittent stitch sewing machine of this invention. It is the same rear view. It is a side view which shows the principal part. It is explanatory drawing which shows the principal part of the transmission mechanism seen from the sewing machine main body lower surface. It is description which shows the principal part of the same thread winding attachment means, (A) is a perspective view, (B) is a partially notched explanatory drawing. It is description of the cam body of the cam mechanism which rock | fluctuates the same type | mold balance, (A) is a top view, (B) is a perspective view. It is explanatory drawing which shows the principal part of the same thread tension. It is description of the support mechanism which mounts a sewing machine table stand and a sewing machine main body, (A) is explanatory drawing which shows the principal part of this invention, (B) is explanatory drawing of the conventional support mechanism. It is description which shows the positional relationship of the cam groove of the said cam body, and a lower type | mold balance, (A) is explanatory drawing in which the actuator for balances faces the 1st cam part of a cam groove, (B) is the cam displacement of a 1st cam part. FIG. 6 is an explanatory view in which the balance swings downward and the upper thread is initially fed. It is description which shows the positional relationship of the cam groove of the said cam body, and a lower type | mold balance, (A) is explanatory drawing in which the operator for balances faces the 2nd cam part of a cam groove, (B) is a balance in a 2nd cam part. FIG. 6 is an explanatory diagram for further downward swinging and pulling the upper thread further downward to extend the slack loop. It is explanatory drawing which shows the principal part of the looper apparatus part which has the link mechanism of the intermittent movement which is located in the lower part of the bed and a looper part thread hole draws an 8-shaped locus. It is description which shows the principal part of the semi-rotation type | mold kama apparatus part, (A) is explanatory drawing incorporating the hook part which sets a bobbin, (B) is explanatory drawing of the driver mechanism part arrange | positioned in the same kama frame. . In the explanation of the driver unit corresponding to the thick thread in the hook device part, (A) is an explanatory view of the receiving piece part standing upright on one side of the driver part, and (B) is a long holding of the upper thread coming out of the hook in the receiving piece part. It is explanatory drawing which maintains a predetermined space | interval in the bobbin thread from a bobbin case. It is explanatory drawing which shows the principal part of the same lining feed mechanism. In the lining feed mechanism, the main part of the corner stitching is explained. (A) is a feed type pulse motor driven by a movable second fulcrum shaft of a bifurcated rod, a first fulcrum shaft centered on the upper shaft, and a horizontal feed lever. FIG. 7B is an explanatory diagram showing a conventional stitch sewing in which the second fulcrum shaft is appropriately rotated by a spring or the like without including a feed pulse motor. FIG. 5A is an explanatory diagram in which the stitches on both sides are continuous by square stitching, and FIG. 5B is an explanatory diagram in which a conventional double-sided seam without adjusting the lowering of the sewing needle is not continued. It is explanatory drawing which shows the relationship between the same cloth feed and an upper cloth presser. In the description of the needle support device, (A) is an explanatory view of a double-structure needle bar that is raised and lowered by a known crank mechanism of the upper shaft of the sewing machine, and (B) is a sewing needle and an attached needle attached to the needle bar. It is explanatory drawing which shows these relationships. It is the explanation which shows the sewing relation of the same upper thread and lower thread, (A) is the explanation drawing which waits the sewing needle in the highest rank, (B) is the explanation drawing of the relationship between the looper section and the needle drop position. It is the explanation which shows the sewing relation of the same upper thread and lower thread, (A) is the explanation drawing which passes the sewing needle through the needle plate and removes from the lower needle drop position, (B) shows the relationship between the looper part and the needle drop position. It is explanatory drawing shown. It is the explanation which shows the sewing relation of the same upper thread and the lower thread, (A) is the explanation drawing where the needle which pulled up the upper thread with the sewing needle is pierced below the needle plate and removed from the needle drop position, (B) is the needle drop position It is explanatory drawing which shows the positional relationship of the looper part which turned. It is the explanation which shows the sewing relationship of the same upper thread and lower thread, (A) is the explanation drawing of the upper thread pull for the loop further swinging downward, (B) the explanation which shows the relationship between the looper part and the needle drop position FIG. The relationship between the upper thread and the lower thread is explained. (A) is an explanatory diagram in which the lowered upper thread is loosened at the end of the cam part and hooked on the tip of the hook sword, and (B) shows the relation between the looper part and the needle drop position. It is explanatory drawing. It is the explanation which shows the relationship between the same upper thread and lower thread, (A) is the explanation drawing which turns the upper yarn loop section around the hook, (B) is the explanation drawing of the looper section which turns around the needle drop position. It is explanation which shows the thread stop of the stitch end of the intermittent stitch to a predetermined cloth, (A) is a top view, (B) is an explanatory view which hooked the upper thread and entangled the entanglement part of the lower thread into the cloth and fastened the thread. .

  Hereinafter, the intermittent stitch sewing machine of the present invention will be described with reference to the drawings.

  FIG. 1 to FIG. 24 show an embodiment of a main part of the intermittent stitch stitch sewing machine in which a balance is arranged at the lower part of the machine body bed. 1 is a cam mechanism for a lower balance that is connected to a drive shaft 6 provided at the lower part of a bed portion 5 that makes the rotation of the upper shaft 3 provided in the sewing machine body 2 to 1/2 rotation through a transmission mechanism 4 as appropriate. The cam mechanism 1 has a base end pivotally mounted to receive the actuator 10 by fitting a balance actuator 10 into an endless cam groove 8 (see FIGS. 6A and 6B) engraved around the disc-shaped cam body 7. A movable piece portion 9b integrated with a base end portion of a balance 9 having a predetermined threading hole 9a and a second threading hole 9a 'on the winding side is provided on a sliding portion 11a provided on the swing member 11. The interlocking shaft 12 is connected. In this case, the shape of the cam groove 8 of the cam body 7 is a multi-stage cam body in which the first cam portion 8a for initial feeding of the upper thread and the second cam portion 8b for loop feeding are continuously arranged at a predetermined interval. Is swung downward stepwise. Reference numeral 13 denotes a looper device portion that faces a position below the needle plate 14 of the sewing machine body 2. The looper device portion 13 branches to an interlocking shaft 15 that appropriately transmits the rotation of the drive shaft 6 via a transmission mechanism 16 such as a bevel gear. Two looper interlocking rods 17a and 17b that move back and forth at different speeds are arranged, and the tip of each interlocking rod that exhibits a link mechanism is connected to the end of the looper portion 19 to which the upper thread yarn hole 18 is attached. The looper portion 19 is connected to the end of the lower support plate 20 on which the looper portion 19 is placed, and the thread hole 18 is moved intermittently to draw an 8-shaped trajectory by rotating these two pivot points (see FIG. 11). Reference numeral 21 denotes a lower shaft for a semi-rotating driver and hook that is linked to the drive shaft 6 via a known linkage mechanism (not shown), and a hook device portion 23 that incorporates a predetermined hook 22 is disposed on the lower shaft 21. . Reference numeral 24 denotes an upper thread thread tension disposed below the kama device section 23 (see FIG. 7). The thread tension 24 includes two tension plates 24a and 24b, an adjustment spring 24c and a tension nut 24d at predetermined intervals. This is a configuration in which a thread loosening solenoid 25 is provided at the tip end portion of the support shaft portion 24e and actuated by a sewing end signal at the rear end portion of the support shaft portion. In the solenoid 25, when the operation shaft 25a protrudes by the operation of a predetermined signal and protrudes the support shaft portion 24e, the two tension plates 24a and 24b having a predetermined thread holding interval are pushed and spread against the pressing of the adjustment spring 24c. The holding is loosened and the upper thread is easily removed.

  Numeral 26 is a thread winding attachment means horizontally projecting to the lower side of the machine body 27 (see FIG. 5), and is a length for fitting and setting a thread spool 29 on a short thread winding receiving hollow fixed support shaft 28 fixed to the machine body at the base end. A hollow guide shaft portion 30 of the shaft is fitted, and a known wedge fastening piece 31 fitted in advance on the inner periphery of the base portion of the hollow guide shaft portion 30 and the hollow fixed support shaft 28 on the hollow fixed support shaft 28 side is slid and transferred. The wall surface is pressed and a predetermined wedge is tightened to form a robust double support shaft 32. In this case, the upper yarn a from the bobbin 29 is led to the tip of the hollow guide shaft portion 30 and inverted and inserted into the yarn port 30a, passes through the shaft 28a of the concentric hollow fixed support shaft 28, and is led out from the machine body side mounting end port 28b. Further, it is configured to rise up to the inclined guide rod 33 standing on the fixed leg portion 27a of the machine body 27 and to sequentially hide the plurality of yarn dive grooves 35 formed in the upper-end twist-stopping piece 34, and the yarn twist-back mechanism 37 as a whole. It becomes. Here, even if the upper thread a is twisted, the thread is subjected to reverse insertion into the double support shaft 32 and stepwise pulling, and the terminal threading piece 34 is used to squeeze with a plurality of thread dives. The yarn is then untwisted and turned straight to be sent to the balance.

  Reference numeral 38 denotes a support mechanism (hinge structure) of the sewing machine main body 2 placed on the sewing machine table 39 (see FIG. 8). The support mechanism includes a support shaft 40 that protrudes from one corner of the base portion 2a of the sewing machine main body 2. The position is not the support shaft 40 ′ (see B in FIG. 8) disposed at the one-side corner g farthest from the center of gravity line j of the sewing machine body as in the prior art, but from the one-side corner g to the center of gravity line j side. The fulcrum shift projecting by appropriately shifting the width d (see A in FIG. 8). A bearing portion 42 for the support shaft 40 is also disposed opposite to the fitting groove portion 43 of the table base 39 to provide a center-of-gravity moving support mechanism 38A that shifts the support load of the sewing machine main body 2 as a whole toward the sewing machine main body gravity line. The load on the main body received by the support shaft 40 is reduced by lever action by an amount corresponding to the center-of-gravity transition width, and the rotation of the main body is improved.

  Further, the details of the kama device unit 23 include a configuration in which the kama 22 is set in a driver unit 44 integrated with a rotary base 21a disposed on a lower shaft 21 for a driver-and-kama appropriately transmitting from the drive shaft 6. The part itself has a bent wall part 46 with an arcuate guide groove 45 on one side and a receiving piece part 47 on the symmetrical side and a control piece 49 with a thread presser claw 48 facing the guide groove 45 at an orthogonal position. doing. In this case, as shown in FIGS. 13A and 13B, the shape of the receiving piece portion 47 is a wide receiving piece portion 47 ′ having a curved guide surface 47b with a rotation direction as a sharp protrusion 47a and a width toward the base. Then, even when a thick thread is used, the upper thread a that extends around the hook 22 is drawn out smoothly without slack by the inclined guide along the wide receiving piece 47 ', and is smoothly removed from the inner bobbin. It does not interfere with the lower thread b.

  Reference numeral 50 denotes a lining feed mechanism disposed at the lower portion of the bed portion 5. This lining feed mechanism is provided with a horizontal feed lever 52a at the lower end of a known bifurcated rod 51 that branches and transmits from the eccentric ring portion 3a of the rotary shaft 3 of the sewing machine body. And a vertical feed shaft 54 disposed via a vertical feed lever 54a at the lower end of another rod 53 arranged in a C-shaped manner with respect to the bifurcated rod that transmits eccentricity separately from the rotary shaft 3. A feed upper base 58 that is arranged side by side on both sides of the lower part, and has a horizontal feed arm 55 protruding from the tip of the horizontal feed shaft 52 and a vertical feed arm 56 at the tip of the vertical feed shaft 54, with a feed dog 57 for lining in the middle. The both ends are connected to each other, and a predetermined lining is fed to the feed dog 57. In this case, a movable second fulcrum shaft 62 is connected to a first fulcrum shaft 60 on the center of the upper shaft facing a known stitch dial 59 disposed on the top of the bifurcated rod 51 with a feed adjusting lever (cam) 61. To do. The second fulcrum shaft 62 is normally in a lateral position off the center line connecting the first fulcrum shaft 60 and the horizontal feed lever 52a at the lower end, and causes the bifurcated rod 51 to move up and down a predetermined distance. Further, the second fulcrum shaft 62 is provided with a feed pulse motor (stepping motor) 64 provided with an origin sensor 63 for detecting a feed amount 0, and a feed adjustment arm 65 and a link 66 protruding from the motor shaft 64a. The corner stitching mechanism 67 is formed as a whole. If the second fulcrum shaft 62, which is the fixed position, is moved by moving the feed adjusting lever 61 by motor driving to the center line, the bifurcated rod 51 is merely swung and the feed amount becomes substantially zero.

  That is, when the angle stitching mechanism 67 is used for corner stitching and both side stitches are made continuous, the angle adjusting signal is received, the pulse motor 64 is driven, and the motor shaft 64a is rotated by a predetermined step angle. Then, the link 66 is moved through and the feed adjusting lever 61 is rotated. The position of the second fulcrum shaft 62 integral with the lever 61 is moved to the center line of the first fulcrum shaft (pin) 60 connected to the upper shaft of the lever 61 rotated by a predetermined spring (not shown) ( (See B in FIG. 15). If the second fulcrum shaft 62 is collinear with the first fulcrum shaft 60 at the center of the upper shaft, the pin (first fulcrum shaft is centered on the second fulcrum shaft 62 even if the eccentric ring portion 3a of the upper shaft 3 rotates. ) Is merely swinging, and the vertical movement of the forked rod 51 is close to 0 (the feed amount of the dough is 0). In this way, by driving the feed pulse motor 64, the position of the second fulcrum shaft 62 is changed via the feed adjustment lever 61 and the amount of horizontal feed is converted, and the stitches on both sides are easily continuous by square stitching. For example, as shown in FIG. 16A, the vertical movement of the bifurcated rod 51 is close to 0 just by making the position of the second fulcrum shaft 62 collinear with the first fulcrum shaft 60 by the operation of the feed pulse motor 64. There is no stitch gap e and both seams a are continuous. Of course, in the conventional sewing machine without the corner stitching mechanism 67, the predetermined gap e is interposed even at the corner stitching portion and the stitches are not continuous (see B in the figure). In FIG. 15A, if the rotation angle of the feed adjusting arm 65 is changed to the arrow direction m (right direction) by a separate mechanical operation (not shown), the feed amount increases.

  Reference numeral 68 denotes a vertical support shaft portion that moves up and down via a known crank mechanism (not shown) from the upper shaft 3 disposed at the front end portion of the sewing machine body 2, and has a structure in which a presser foot 69 facing the needle plate 14 is attached to the lower end thereof. In addition, a cloth feed body 71 for interlocking cloth feeding is provided alongside a known interlocking mechanism from a lateral interlocking shaft 70 that branches separately on the side portion of the vertical support shaft section 68, and a bifurcated guide groove 72 at the lower end of the cloth feeding body. In the known structure in which the presser foot 69 is fitted (see FIG. 17), the presser foot 69 and the cloth feed body 71 perform a predetermined cloth feed by alternately moving up and down and moving back and forth. 73 is a known double-shaft needle bar disposed at the tip of the sewing machine main body that moves up and down from the upper shaft 3 through a predetermined crank mechanism. A sewing needle 74 is attached to the lower end of the needle bar 73, and the sewing needle 74 is When the needle bar 73 is lowered, it is stabbed into the predetermined fabric A. At this time, the sewing needle 74 has a structure in which a supplementary needle 76 attached to a support piece 75 provided on the side part is attached to the guide groove part 74a vertically formed on the side part by a certain amount of drop, and the sewing needle 74 is attached to the sewing needle 74 with the supplementary needle. The hook port 74b that is notched is closed to prevent the fabric from being caught.

  Here, the thread hole 18 of the looper portion 19 facing the lower surface of the needle plate 14 has moved in the shape of an 8-shaped locus f by a predetermined link mechanism, and the thread hole has come to the needle drop position c of the locus rear part f ′. When the sewing needle 74 descends. In other states, even when the hook 22 rotates, the upper thread a is not caught by the sword tip, and the upper thread a does not go around the outer periphery of the hook 22. In this state, the upper thread a does not get entangled with the lower thread b coming out of the internally housed bobbin case 77 (see FIG. 20B to FIG. 21B). At this time, the position of the actuator 10 that operates the balance 9 faces the first cam portion 8a of the cam groove 8 where the upper thread is initially fed, and the balance 9 swings downward by a predetermined amount according to the cam displacement. The initial take-up of the upper thread. Thereafter, the lowering sewing needle 74 is raised by a predetermined return operation. At this time, the upper thread a is hooked on the hook port 74b and pulled up through the cloth (see FIG. 21). When the sewing needle 74 is raised, the above-mentioned standby needle 76 is attached, so that the fabric is smoothly removed.

  Further, when the sewing needle 74 descends again, the operator 10 of the balance 9 moves to the second cam portion 8b, and the balance 9 is further swung downward in accordance with the cam displacement to greatly lower the upper thread a. Pulled to the upper part of the thread for the slack loop. The feeding length of the upper thread is determined by the additional (secondary) downward swing width h of the balance 9 as described above (see B in FIG. 10). The upper thread a is forcibly pulled downward by the lowering of the sewing needle 74, but this pulling ends at the end of the cam part and automatically loosens, and the upper thread part becomes a slack loop a '. That is, the slack loop for rotating the upper thread is directly formed at the lower position of the bed (see FIG. 23). Thereafter, the slack loop a 'of the upper thread is immediately hooked on the sword tip 22a of the hook 22 of the hook device portion 23 that rotates half turn. Of course, the balance 9 itself only needs to be forced to swing downward by the second cam displacement, and an operation without malfunction is obtained.

  Further, the slack loop portion of the upper thread a is rotated by the sword tip 22a of the rotating paddle 22 at the lower position of the needle plate 14, so that the lower thread b fed from the bobbin case 77 in the paddle 22 is drawn. It will definitely dive through. At this time, the presser foot 69 is raised, and the cloth feed body 71 is also retracted to obtain a predetermined cloth feed. Further, the balance 9 is raised by the cam operation, and the thread hole 18 of the looper portion 19 moves to the first half position f ″ (entanglement position) of the 8-shaped locus f. The details of the positional relationship of the rotation and the balance 9 as a whole are as shown in FIGS.

  In this way, when the hook 22 rotates (see FIG. 24), the slack loop a ′ of the upper thread a goes around the hook 22 and smoothly feeds along with the lower thread b coming out of the bobbin case portion 77 in the hook. Is done. At this time, the balance 9 is pulled down, the upper thread is tensioned, and a predetermined cloth feed is performed. When the balance 9 is completely in the upper position, the cloth feed is stopped, and a stitch is formed for the first time and the sewing is finished.

  In this case, as shown in FIGS. 25A and 25B, the upper thread a appearing on the surface of the fabric A is fed once without the lower thread b being entangled once, and the loop a of the upper thread a 'Is pulled every other time and is put on the lower thread b, and stitch sewing is performed at a predetermined interval e.

  If a single cam body is formed into an endless cam groove shape in which two cam portions are continuous, it can contribute to the use of a compact cam mechanism.

DESCRIPTION OF SYMBOLS 1 Cam mechanism for lower scale balance 2 Sewing machine main body 3 Upper shaft 5 Bed part 7 Cam body 8 Endless cam groove 8a First cam part for initial feeding 8b Second cam part for loop feeding
DESCRIPTION OF SYMBOLS 13 Looper apparatus part 14 Needle plate 18 Upper thread thread hole 19 Looper part 21 Lower shaft 22 Cama 23 Comb apparatus part 24 Thread tension 25 Thread release solenoid 26 Thread winding attachment means 28 Hollow fixed support shaft 29 Thread winding 30 Hollow guide shaft part 32 Double support shaft 34 Unscrewing piece 37 Thread twist return mechanism 38 Support mechanism 39 of the sewing machine body Table base 40 Main body side support shaft 41 Table side bearing portion 44 Driver portion 47 Driver portion receiving piece portion 50 Lining feed shaft 51 Bifurcated rod 52 Horizontal feed shaft 54 Vertical feed shaft 57 Feed dog 60 First fulcrum shaft 61 Feed adjustment lever 62 Movable second fulcrum shaft 64 Feed pulse motor 67 Square stitching mechanism 68 Vertical support shaft 69 Presser foot 71 Cloth feed body 73 Needle bar 74 Sewing needle

Claims (5)

  The cam mechanism for the balance connected to the drive shaft at the bottom of the bed that halves the rotation from the upper shaft of the sewing machine main body, the lower balance that swings with the cam body of the cam mechanism, and 2 branched from the drive shaft A looper device part where the looper part thread hole faces the underside of the needle plate by an intermittent movement that draws an 8-shaped locus with a link mechanism of an interlocking hook for loopers with different speeds, and a half with a bobbin that is linked separately from the drive shaft A lower thread kama device unit with a rotary type kama and a driver unit and a predetermined lining feed mechanism linked to the same drive shaft are arranged, and a predetermined sewing needle mechanism with a splicing needle linked to the upper axis of the sewing machine main body is arranged at the top of the bed. A cloth feeder and presser foot are arranged, and the upper thread at the bottom of the bed is guided to the looper thread hole at the needle drop position by swinging the lower balance, and this is transferred to the upper part of the bed through the fabric with the sewing needle. At the bottom of the bed with a seam and appropriate tension loop formation Then, the upper thread loop is hooked on the hook device and the lower thread is entangled and the upper thread escapes where the lower thread does not entangle with the needle drop position. In the sewing machine, the cam mechanism of the cam mechanism of the lower balance, the disk-shaped multistage cam body in which the first cam portion for initial feeding of the upper thread and the second cam portion for loop feeding are continuously formed in the endless cam groove, The upper thread is fed by the swinging of the balance by one cam part. The looper part, which moves the upper thread for a predetermined distance, leads the upper thread first, and the upper thread is moved to the upper part of the bed and the seam is attached to the lower part of the bed. The balance has an upper thread feeding mechanism with a secondary thread feeding of the upper thread that pulls the upper thread to the lower part of the bed by performing further downward rocking at the second cam portion. Width is upper thread from the top of the bed The loop length of the upper thread that leads to the vicinity of the rotation of the upper thread, which also serves as a pull that resists loosening caused by the thread, and when the hook device section is hooked on the upper thread, the cam section ends and the slack loop that loosens the tension, and this loop as the hook device An intermittent stitch sewing machine characterized in that the hook thread is engaged with the lower thread and the needle thread is entangled, and stitch sewing is performed with the upper thread not entangled with the lower thread not facing the needle drop position.   The corner stitching mechanism is linked to the first fulcrum shaft that is the center of the upper shaft facing the seam dial of the bifurcated rod that the horizontal feed shaft for lining is attached to the lower end, and the axis of the feed pulse motor that operates with a predetermined angle stitch signal. 2. A movable second fulcrum shaft is provided continuously through a feed adjusting lever, and the second fulcrum shaft is changed to a center line of the first fulcrum shaft by driving the pulse motor to change the stitch feed amount to zero. Interim stitch sewing machine.   The thread tension of the upper thread is provided with a pair of tension plates at a predetermined interval in the front part of the slide-type support shaft part, and a thread loosening solenoid that operates due to a sewing end signal is provided at the rear part of the support shaft part. The intermittent stitch sewing machine according to claim 1, wherein the support shaft portion is pushed and slid at the end to widen the interval between the two tone plates.   The upper thread bobbin attaching means is fitted with a long shaft hollow guide shaft portion with a long shaft for setting the bobbin on the hollow fixed support shaft of the short shaft that protrudes horizontally outward from the lower part of the machine body, and has a double support shaft configuration. The intermittent stitch stitching sewing machine according to claim 1, wherein an inclined guide bar with a thread dive screwing piece attached to the top is provided upright on a support leg in a lower part of the machine body to which the hollow fixed support shaft is attached. The support mechanism of the sewing machine main body placed on the table base has a support shaft that protrudes at one corner of the sewing machine main body base, and is shifted from the one side corner position of the sewing machine main body to the upper side of the center of gravity line of the sewing machine body. 2. A center-of-gravity moving support mechanism in which a bearing portion of a table base side fitting groove that receives the support shaft is also disposed oppositely at the same position, and the support point of the sewing machine body is shifted toward the center of gravity line of the sewing machine body as a whole. Interim stitch sewing machine.

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