JP2007196009A - Sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thread selecting/carrying device which simplifies operation when changing a thread during continuous sewing to exchange a large number of color threads in a sewing machine with automatic thread laying, threading apparatus. <P>SOLUTION: In a sewing machine equipped with automatic thread guide/threading device 300, 500, 600 which deliver a needle thread which is pulled out from the side of a thread supply source and insert it into an eyelet of a sewing needle N, a thread supply source which can set three bobbins 11, and a thread selecting/carrying device 200 which has three thread grippers 221 to hold the needle thread, respectively, which is pulled out respectively from three bobbins 11 which is set in this thread supply source and can deliver these three thread grippers 221 so that a thread is caught selectively for the automatic thread guide/threading device 300, 500, 600 are provided. The thread supply source has a thread winding member 108 which can rotate around the bobbin 11, evacuates to a position which does not prevent the thread flow pulled out from the bobbin during sewing, and changes the posture nearly at right angle relative to the bobbin when rewinding the thread. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a sewing machine with an automatic threading / threading device that automatically threades an upper thread through a sewing needle.

In general, in an embroidery sewing machine, a plurality of upper threads of different colors are selectively used, but it is troublesome to pass the upper thread through the eye of the sewing needle each time the upper thread is replaced. Therefore, various proposals have been made for devices that can automatically perform the threading operation. For example, according to Patent Document 1, a frame provided with a drawing device for guiding a large number of yarns in parallel and maintaining a predetermined yarn amount for each yarn is selectively moved so that the posture is kept horizontal at the tip. 2. Description of the Related Art There is known an automatic thread changing device that rotates an arm provided with a thread clamping portion and inserts a thread carried by a thread clamping tool into a needle hole with a thread insertion tool provided in a sewing machine body.
JP-A-61-89365

  However, the conventional sewing machine with an automatic thread changer is a method of selectively moving a frame provided with a pull-in device for maintaining a predetermined thread amount for each thread, as described above, when selecting a thread. In order to move the enlarged frame by increasing the number of yarns, a larger space is required, and there is a problem that the operation is troublesome when replacing the yarn.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a sewing machine provided with a thread selection / conveying device that simplifies the operation at the time of thread replacement during continuous sewing performed by changing a large number of colored threads.

  In order to solve the above problems, the invention according to claim 1 is a sewing machine provided with an automatic threading and threading device for transferring an upper thread drawn from a bobbin thread and inserting the upper thread into the eye of a sewing needle. A thread supply source capable of setting a thread winding; and a plurality of thread gripping portions each holding an upper thread drawn from the plurality of thread windings set in the thread supply source. And a yarn selection / conveying device capable of conveying the yarn so as to be selectively captured by the yarn hooking / threading device.

  Here, as an automatic threading / threading device, the upper thread in the yarn path is gripped and transferred so as to protrude near the eye of the sewing needle, and the transferred upper thread is transferred into the eye of the sewing needle. However, the structure of the drive source and the mechanism for threading and threading are arbitrary. The yarn selecting / conveying device is a small device disposed above the sewing machine.

  As described above, according to the first aspect of the present invention, the upper thread drawn from the plurality of spools set in the thread supply source is held by the plurality of thread gripping portions, respectively, and the automatic threading / threading is performed. Since the sewing machine is equipped with an automatic threading and threading device equipped with a thread selection and transport device that can be transported so that the threading device can selectively catch the thread, the plurality of thread gripping sections provided in the thread selection and transport device are automatically threaded. Since the thread can be selectively captured by the threading and threading device, and the thread winding can be easily replaced, it is easy to change the thread during continuous stitching by changing many colored threads. It becomes.

  Further, in the first aspect of the present invention, the thread supply source can be rotated around the bobbin and is retracted to a position where the flow of the thread drawn from the bobbin is not obstructed during the sewing, and is substantially the same as that of the bobbin during winding. It is characterized by a configuration provided with a yarn winding member whose posture changes in a perpendicular direction.

  For example, the yarn winding member is a semi-circular yarn winding ring.

  Thus, according to the first aspect of the present invention, it is possible to rotate around the bobbin winder, retreat to a position where the flow of the thread drawn out from the bobbin thread is not hindered during sewing, and at a right angle to the bobbin winder when winding the thread. Since the thread winding member whose posture is changed is a sewing machine provided in the thread supply source, during sewing, the winding member can be retracted to a position that does not hinder the flow of the thread, and the thread can be pulled out so as to be loosened from the thread winding. At the time of winding the thread, the thread is wound around the thread winding by a thread winding member that rotates around the thread winding.

  A second aspect of the invention is the sewing machine according to the first aspect, comprising a yarn winding device having the yarn winding member and a drive source for rotationally driving the yarn winding member, the yarn selection conveying device, Each unit is unitized so that it can be separated from the sewing machine body. The yarn winding device is a small device disposed above the sewing machine.

  Thus, according to the invention described in claim 2, the yarn winding member according to claim 1 and the yarn winding device having the driving source for rotating the yarn winding device and the yarn selection / conveying device are unitized, respectively. Since the sewing machine is separable from the sewing machine, it is easy to carry the sewing machine main body by simply removing the yarn winding device and the yarn selecting / conveying device arranged above the sewing machine from the sewing machine main body.

  As described above, according to the sewing machine according to the first aspect of the present invention, the plurality of thread gripping portions provided in the thread selecting and conveying device can cause the automatic threading and threading device to selectively capture the thread. In addition, since the thread winding can be easily replaced, the operation during thread replacement during continuous sewing performed by changing a large number of colored threads can be made easy.

  In addition, during sewing, the winding member retracts to a position that does not hinder the flow of the thread, and the thread can be pulled out so as to be loosened from the thread winding. At the time of winding the thread, the thread winding member rotates around the thread winding. The advantage that a thread can be wound around the thread is obtained.

  According to the sewing machine according to the second aspect of the invention, in addition to the effect obtained by the first aspect of the invention, the yarn winding device and the yarn selection / conveying device disposed above the sewing machine are each easily removed from the sewing machine body. Thus, an advantage that the sewing machine body can be easily carried is obtained.

  Hereinafter, embodiments of the sewing machine according to the present invention will be described with reference to FIGS. FIG. 1 is a schematic perspective view showing an automatic threading / threading device, a thread winding device and a thread selection / conveying device of an embroidery sewing machine as an example of a sewing machine to which the present invention is applied, and FIGS. 2 to 19 show details of each part. FIG.

  First, as shown in FIG. 3, the upper shaft 1 is rotatably supported by a main motor (not shown) (see the sewing machine motor 90 in FIG. 28), and is fixed to an intermediate portion of the upper shaft 1. The upper shaft shielding plate 2 composed of a plurality of fan-shaped plates is detected by a photo sensor (not shown) (see the main shaft sensor 91 in FIG. 28), whereby a signal of the rotational phase position of the upper shaft 1 is obtained. A counterweight 3 is fixed to one end of the upper shaft 1, and the swinging end of the crank rod 4 rotatably connected to the counterweight 3 is in the middle of the needle bar 5 that holds the sewing needle N. A fixed needle bar holder 6 is rotatably connected. A balance 8 is connected to the base side of the crank rod 4 via a crank 7, and a swing end portion of the balance 8 is formed in a thread hook portion 8 a bent in a “T” shape. 8 is formed with a protrusion 8b for preventing the upper thread slippage.

  Further, a yarn winding device 100 as a yarn supply source capable of selectively exchanging a plurality of upper threads of different colors and a yarn selection / conveyance device 200 are provided on the upper portion of the sewing machine main body. First, as shown in FIG. 1, the yarn winding device 100 is disposed above the sewing machine, and includes three yarn winding support bars 101 as shown in an enlarged view in FIG. That is, the three bobbin winding support rods 101A, 101B, and 101C are arranged vertically in parallel with the length direction of the upper shaft 1. A thread winding stopper 102 is provided on each of the thread winding support rods 101A, 101B, and 101C. As indicated by the phantom line, the thread winding stopper 102 has the thread windings 11A, 11B, and 11C attached to the thread winding support bars 101A, 101B, and 101C, and the thread windings 11A, 11B, and 11C are thread winding support bars 101A and 101B, respectively. , 101C, and a function of applying pressure so as not to rotate.

  Since the members provided in the bobbin winding support rods 101A, 101B, and 101C are the same, the suffixes A, B, and C are attached to the same reference numerals in the drawing, but in FIG. Each member provided in the bobbin winding support rod 101 will be described with C omitted. The bobbin winding support rod 101 is screwed and fixed to the mounting plate 110 at the lower end, and the mounting plate 110 is fixed to the base plate 120 by screwing. As shown in FIG. 17, a bobbin receiving tray 103 is fixed to the upper portion of the bobbin winding support rod 101 with a pin 103a and an E ring shown in the figure, and a winding body 104 is rotatably mounted below the bobbin receiving tray 103. This winding body 104 has rising portions 104a and 104b for attaching a winding ring 108 serving as a yarn winding member on the outer periphery of the disk portion so as to face each other in the diameter direction, and at the center of the lower surface of the disk portion. And a cylindrical portion 104d into which the bobbin winding support rod 101 is inserted. A protrusion 104e that restricts the rotation of the operating body 106 is formed at the lower end of the cylindrical portion 104d. A winding body cylindrical portion 104d is slidably inserted into the operating body 106 while being restricted in rotation by a winding body protrusion 104e that engages with the longitudinal groove 106a on the inner periphery. A compression coil spring 105 is interposed between both disk portions of the body 104, and the operating body 106 is biased downward.

  Further, a winding pulley 107 positioned below the operating body 106 is rotatably attached to the bobbin winding support rod 101. The winding pulley 107 has a protrusion 107a at the upper part, and the operating body 106 has a protrusion 106b at the lower part. When the operating body 106 moves downward, the protrusions 106b and 107a are mutually connected. Abut. Further, the winding wheel 108 has a U-shaped bent shape as shown in the figure, and one end portion 108b is rotatably inserted into one rising portion 104b of the winding body 104, and the opposite V-shaped portion. The other end portion 108a is fixed to the winding wheel operating body 109 through 108c. The winding wheel operating body 19 is rotatably mounted on the winding body boss 104 c of the other rising portion 104 a of the winding body 104, and is prevented from being detached by the cover plate 111.

  A torsion coil spring 119 is hung on the take-up body 104 and the take-up wheel operating body 109. As shown in FIG. 18, the force of the torsion coil spring 119 is reversed due to the difference in the rotational position of the take-up wheel operating body 109. The V-shaped portion 108c of the take-up wheel 108 is substantially vertical (see the solid line) at a position where a part of the take-up wheel actuating body 109 and a part of the take-up body 104 are in contact with each other and the rotation is restricted. Designed to be almost horizontal (see the virtual line). Further, the winding wheel operating body 109 is formed with a downward protruding portion 109a with the winding wheel 18 in a substantially vertical state, and when the winding body 104 rotates, a protrusion provided on a bobbin winder cover (not shown). It comes into contact with the portion 112 (see FIG. 30).

  In the thread winding support rods 101A, 101B, and 101C having the above members, as shown in an enlarged view in FIG. 15, the timing belt 113 is hung on the winding pulleys 107A and 107B, and the winding pulleys 107B and 107C are A timing belt 113 is hung. The winding pulley 107C of the yarn winding support rod 101C is different from other winding pulleys in that the lower portion is a gear 115, and the gear 131 of the winding stepping motor 130 as a driving source meshes with the gear 115. Yes. Note that a thread guide bar 116 is fixed to a thread winding base cover (not shown), and the thread guide bar 116 is disposed above each of the three thread winding support bars 101A, 101B, and 101C. 116b and 116c.

  As shown in FIGS. 1, 13, and 14 and further enlarged in FIG. 16, an operation restricting plate A121 is rotatably attached to the base plate 120. One end of the operation restricting plate A121 is in contact with the disk portion of the operating body 106A, pushes up the operating body 106A with the force of the torsion coil spring 151, and is in contact with a stopper 120d provided on the base plate 120. Further, the arm 141b of the operation plate A141 is in light contact with the other end of the operation restriction plate A121 by the force of the torsion coil spring 152 from below. The operation plate A141 is rotatably attached to the base plate 120, and is a contact portion 141a having the other end formed in a circular shape. The abutting portion 141a is located so as to protrude from a movement locus of a winding switching plate 240 described later.

  An operation regulating plate B122 is rotatably attached to the base plate 120. One end of the operation restricting plate B122 abuts on the actuating body 106B, pushes up the actuating body 106B with the force of the torsion coil spring 153, and abuts on a stopper 120e provided on the base plate 120. Further, the operation plate B142 is in light contact with the intermediate portion of the operation regulating plate B122 from above by the force of the torsion coil spring 154. The operation plate B142 is rotatably attached to the base plate 120, and an abutting portion 142a in which an intermediate portion of the arm is formed in a circular shape. The contact portion 142a protrudes on the movement locus of the winding switching plate 240.

  Further, an operation restriction plate C123 is rotatably attached to the base plate 120. One end of the operation restricting plate C123 is in contact with the disk portion of the operating body 106C, pushes up the operating body 106C with the force of the torsion coil spring 155, and is in contact with a stopper 120f provided on the base plate 120. Further, the arm 143b of the operation plate C143 is in light contact with the other end of the operation regulating plate C123 by a torsion coil spring (not shown) from below. The operation plate C143 is rotatably attached to the base plate 120, and has a contact portion 143a having the other end formed in a circular shape. The abutting portion 143a is located so as to protrude from the movement locus of the winding switching plate 240. The yarn winding device 100 is configured as described above.

  The yarn selection / conveyance device 200 moves along a feed screw 201 rotatably attached to the base plate 120 as shown in FIGS. 1, 13, and 14 and further enlarged in FIG. It is provided on the table 220. That is, the feed screw 201 is arranged in parallel with the upper shaft 1, and the gear 201 provided at one end of the feed screw 201 is connected to the gear of the feed stepping motor 210 which is a drive source installed on the base plate 120. 211 is engaged. The above feed screw 201 is inserted into the moving table 220, and a pin (not shown) fixed to the moving table 220 is engaged with the screw groove of the feed screw 201. In addition, a rotation restricting body 203 is attached to the moving table 220 in a state where the guide portion 120a of the base plate 120 is sandwiched from above and below, thereby preventing the moving table 220 from rotating around the feed screw 201. Yes.

  Three sets of thread gripping portions 221 are provided on the moving table 220, that is, the upper threads pulled out from the thread windings 11A, 11B, and 11C set on the three thread winding support rods 101A, 101B, and 101C, respectively. Are arranged side by side with three sets of thread gripping portions 221A, 221B, and 221C. The thread gripping portion 221 includes a threading tension plate 222 and a thread presser plate 223. That is, the thread retainer plate 223 is assembled to a shaft crimped to the threading tension plate 222, and the thread retainer is pressed by the force of a compression coil spring (not shown). The plate 223 is pressed against the yarn hooking tension plate 222. Note that a not-shown protrusion formed on the thread retainer plate 223 enters a hole 222a formed on the thread retainer tension plate 222, and the upper thread that has entered between the thread retainer tension plate 222 and the thread retainer plate 223 comes off. It is difficult.

  A thread trimming guide base 224 is provided next to the thread gripping part 221, and a thread trimming blade 225 is held at a predetermined position from the thread gripping part 221 on the thread trimming guide base 224. The thread trimming blade 225 cuts the upper thread put between the thread hooking tension plate 222 and the thread presser plate 223 by a predetermined length. Further, on the moving table 220, there are provided yarn guide groove plates 226, 226, and 226 for guiding yarns ahead of the three sets of yarn gripping portions 221A, 221B, and 221C. Further, a winding switching plate 240 protruding to the back side is fixed at the center on the moving table 220, and this winding switching plate 240 has a T-shape in plan view as shown in the figure. Both end portions 240a and 240b are smoothly bent upward.

  A cover 230 is fixed on the movable table 220 including the three sets of the thread gripping portions 221A, 221B, 221C, the thread trimming guide table 224,. Three sets of thread hooks 231 are provided on the cover 230, that is, three thread winding support rods 101A, 101B. Three thread hooks 231A, 231B, and 231C are provided side by side to hang the upper threads respectively pulled from the thread windings 11A, 11B, and 11C set on the 101C. Further, the cover 230 is formed with three thread guide grooves 232A, 232B, and 232C extending from the three thread hooks 231A, 231B, and 231C, and the three thread guide grooves 232A, 232B, and 232C are formed. When the upper thread is passed along each, the upper thread can be set in each of the thread gripping portions 221A, 221B, 221C.

  The cover 230 is formed with openings 234A, 234B, and 234C for projecting the thread trimming guide bases 224, 224, and 224 of the three thread gripping portions 221A, 221B, and 221C, respectively. Therefore, the upper thread after being hooked on the three thread gripping portions 221A, 221B, and 221C is passed along grooves formed by the respective opening portions 234A, 234B, and 234C and the thread trimming guide bases 224, 224, and 224. And you can cut it. As described above, the yarn selection transport device 200 is configured.

  A connector 125 is provided for connecting the winding stepping motor 130 and the feed stepping motor 210 to a circuit board in the sewing machine main body (not shown). Further, the base plate 120 is attached and fixed to the sewing machine main body frame (not shown) with set screws 126 and 127 at the left and right end portions 120b and 120c. Therefore, by removing the connector 125 and removing the set screws 126 and 127, the yarn winding device 100 and the yarn selection / conveying device 200 attached to the base plate 120 can be separated from the sewing machine main body.

  By the way, as shown in FIGS. 1 and 8, the needle bar 5 is swingably attached to a needle swinging swing base 401 constituting a needle swinging mechanism 400 described later. A threading means 300 is attached so as to be adjacent to the table 401. Further, as shown in FIG. 3, a threading positioning stopper 302 constituting the threading means 300 is screwed at a position directly above the needle bar holder 6 fixed to the needle bar 5, and the lower end of the needle bar 5 is A sewing needle N is attached to the portion by a needle set screw 9 a provided on the needle set 9. A thread guide 10 is attached to the needle stopper 9 so as to guide the upper thread to the eye of the sewing needle N. An automatic threading / threading device is constituted by the threading means 300 and the thread passing means 500 and the threading means 600 described later.

As shown in FIG. 8, the upper end portion of the needle swinging swinging table 401 that supports the needle bar 5 has a left / right swinging shaft 403 extending in the front / rear direction and a left / right swinging shaft 403 penetrating in the left / right direction. With the provided front and rear swing shaft 404, the lower end portion of the needle swing swing base 401 is attached so as to swing freely. A swing regulating arm (not shown) is connected to the lower end portion of the needle swing swing base 401. A lower end portion of the needle swinging swing table 401 is swingable in a substantially horizontal plane along an arcuate locus drawn by the swing restricting arm, and in particular,
As shown in FIG. 8, the needle swinging mechanism 400 is configured to reciprocate on the hook by the rotational driving force of the needle swinging stepping motor 405.

  Further, a threading shaft 305 is mounted on the needle swinging swing base 401 so as to be rotatable and movable up and down substantially in parallel with the needle bar 5. A cylindrical portion 307 of a threading lever 306 is fitted to the upper end portion of the threading shaft 305, and the lower end portion of the threading shaft 305 is particularly as shown in FIGS. Further, a known threading hook holder 308 is attached. As shown in FIG. 5, the upper end portion of the threading shaft 305 is rotatably inserted into the cylindrical portion 307 of the threading lever 306. One end side of the operating pin 310 fixed so as to penetrate the upper end portion of the threading shaft 305 in the direction perpendicular to the axis is loosely fitted in the cam groove 311 formed in the cylindrical portion 307 of the threading lever 306. Has been inserted.

  As shown in FIG. 12, the cam groove 311 of the cylindrical portion 307 includes an inclined groove cam 311a extending so as to form a part of a spiral shape, and a vertical extension extending upward in the axial direction from the upper end portion of the inclined groove cam 311a. It consists of a groove cam 311b. The inclined groove cam 311 a imparts a rotating action to the threading shaft 305 by the axial movement of the threading lever 306 relative to the threading shaft 305. The longitudinal groove cam 311b has a configuration for holding the threading shaft 305 so as to be axially movable without rotating. Further, as shown in FIG. 5, a compression coil spring 312 is interposed in a compressed state between the operating pin 310 and the upper end portion of the cylindrical portion 307, so that the threading shaft 305 is threaded. The through lever 306 is maintained in a state where it is pulled upward.

  The other end side of the operating pin 310 is disposed so as to abut and separate from the upper side in the axial direction with respect to the threading positioning stopper 302 of the needle bar 5. When the operating pin 310 abuts on the threading positioning stopper 302 of the needle bar 5, the threading hook 313 (see FIGS. 6 and 7) provided on the threading hook holder 308 matches the eye of the sewing needle N. The height relationship is adjusted so that the threading shaft 305 stops at the position where the threading is made. When the threading lever 306 is further pushed down after the operating pin 310 contacts the threading positioning stopper 302 of the needle bar 5, one end portion of the operating pin 310 is guided in the rotational direction along the inclined cam 311a. Thus, the threading shaft 305 is configured to rotate together with the threading hook holder 308.

  Further, as shown in FIG. 8, the guide plate 314 provided so as to hang down from the upper end of the needle swinging swing table 401 is provided between a protrusion 315 provided in the middle of the threading lever 306. The tension coil spring 316 is hung in a tensioned state. The threading lever 306 is pulled upward by the upward biasing force of the tension coil spring 316.

  Further, a locking portion 317 that protrudes toward the back of the sewing machine is formed in the middle portion of the threading lever 306. A threading lever 306 is lowered by an operating body of a thread passing means 500 described later coming into contact with the engaging portion 317 from above. Further, a thread hooking stopper 318 that abuts against the operating body of the thread passing means 500 and stops the operating body at that position via a collar 319 (see FIG. 5) at a substantially central portion in the height direction of the threading shaft 305. Attached in place. The thread hook stopper 318 can also be attached to the needle bar 5.

  On the other hand, as shown in FIGS. 6 and 7, a threading hook holder 308 is fixed to the lower end position of the threading shaft 305. As is well known, the threading hook holder 308 has a pair of threading hook guide plates 320 and 320. A threading hook 313 is fixed between the pair of threading hook guide plates 320 and 320. In each of the threading hook guide plates 320 and 320, guide grooves 321 and 321 cut substantially horizontally are formed so as to be cut out at the same height. By attaching the upper thread A to be threaded into both the guide grooves 321 and 321 so as to be slid, and hooking the upper thread A on the key part 322 formed at the tip of the threading hook 313, The upper thread is drawn into the eye of the sewing needle N.

  Here, the key portion 322 of the threading hook 313 is formed so that the lower edge side of the plate-like hook body is cut out in a substantially triangular shape. Thus, the upper thread A hooked on the key part 322 of the threading hook 313 is immediately dropped downward from the key part 322 of the threading hook 313 after the eye of the sewing needle N is inserted and released. It has become.

  Further, as shown in FIG. 5, a needle stopper thread hook mounting body 323 is rotatably attached to the threading shaft 305 from the upper side of the threading hook holder 308, and the needle stopper thread hook mounting body 323 is attached to the needle threading thread hook mounting body 323. A needle stopper thread hook 325 is rotatably attached to the upright rotating shaft 324. As shown in FIG. 6, a partial gear 327 provided on the needle stopper thread hook 325 is engaged with a partial gear 326 provided on the threading hook holder 308. Further, as shown in FIG. 5, the stopper member 328, which is cut and raised on the needle fixing thread hook attachment body 323, comes into contact with the side surface of the threading lever 306 to restrict the rotation, thereby The rotational force of the shaft 305 is transmitted to the needle stopper thread hook 325, and the threading hook holder 308 and the needle stopper thread hook 325 are rotated in opposite directions. Here, the rocking end portion of the needle stopper thread hook 325 is formed in a bifurcated shape that holds the threaded upper thread A. The bifurcated portion rotates in the opposite direction simultaneously with the rotation of the threading hook holder 308 so as to approach and separate from each other.

  On the other hand, as shown in FIGS. 1, 4, and 12, the thread passing means 500 is disposed adjacent to the threading means 300. In the thread passing means 500, a screw-like drive shaft 501 is erected substantially vertically on the base plate 502 so as to be adjacent to the threading shaft 305. A drive gear 503 is provided at the upper end portion of the drive shaft 501. Although not shown, the drive gear 503 is engaged with an intermediate gear that is rotationally driven by a stepping motor for thread passing and threading (see reference numeral “330” in FIG. 18).

  A thread passing operation body 504 is screwed onto the drive shaft 501 so as to reciprocate in the vertical direction. As shown in FIG. 4, the yarn passing operating body 504 includes a hollow box-shaped external operating body 505 mounted in a freely moving state with respect to the drive shaft 501, and an internal mounted inside the external operating body 505. An actuating body 506. The drive pin 508 erected on the operation plate 507 disposed on the front side of the internal operating body 506 engages with the screw groove of the driving shaft 501, whereby the internal operating body 506 is moved up and down. ing.

  In addition, a compression coil spring 509 is disposed inside the external operating body 505 so as to contact the bottom surface portion of the internal operating body 506. The compression coil spring 509 extends in the axial direction so as to push up the internal working body 506 upward. By the biasing force of the compression coil spring 509, the inner and outer operating bodies 506 and 505 are configured to move together in the vertical direction.

  In addition, a thread press locking portion 511 is provided at a lower edge portion of the operating plate 507 provided in the internal operating body 506 so as to be bent substantially at a right angle. When the thread pushing latching portion 511 is in contact with the latching portion 317 of the threading lever 306 from above, the threading lever 306 is pushed down. Furthermore, from the upper surface of the external operating body 505, a thread passing locking portion 512 is provided so as to protrude substantially horizontally toward the threading shaft 305 side. Such a thread passing latching portion 512 of the external moving body 505 is brought into contact with the thread hooking stopper 318 of the threading shaft 305 from above so that the downward movement of the external operating body 505 is stopped. It has become.

  Further, a rack gear 513 is disposed in the vicinity of the side portion of the external moving body 505 so as to rise substantially at a right angle. In a long vertical groove 514 drilled in the rack gear 513, a regulation shaft 515 erected on the internal operating body 506 so as to project substantially horizontally on the side of the external moving body 505 is allowed to move up and down. It is fitted. By the guiding action based on such a configuration, the external moving body 505 is guided to move up and down without rotating.

  Further, as shown in FIGS. 1 and 12, the yarn passing shaft 516 is fixed to the side portion of the external moving body 505 so as to protrude substantially horizontally so as to be adjacent to the upper regulating shaft 515. A thread passing operation gear 517 and a base side of the thread passing arm 518 are rotatably mounted on the thread passing shaft 516 via a collar. The yarn passing operation gear 517 and the base side of the yarn passing arm 518 are urged to rotate in opposite directions by a torsion coil spring 521 attached to the yarn passing shaft 516. Then, a protrusion 522 formed integrally with the yarn passing operation gear 517 so as to extend in the radial direction and a locking pin 523 fixed to the base side of the yarn passing arm 518 are rotated by the rotational biasing force of the torsion coil spring 512. Abutting in the direction. Accordingly, both members, that is, the yarn passing operation gear 517 and the yarn passing arm 518 are elastically engaged in the rotational direction via the torsion coil spring 521.

  The yarn passing operation gear 517 is arranged so as to mesh with the rack gear 513. When the external operating body 505 moves up and down, the yarn passing operation gear 517 moves up and down while rotating. The yarn passing arm 518 is configured to rotate with the rotation.

  As shown in FIG. 19, each member is attached to the yarn passing arm 518 which is a yarn transfer member. First, reference numeral 580 denotes a thread passing gripping part (thread catching part), and 581 denotes a thread presser body. The thread passing gripping part 580 includes a thread presser part 519 formed on the thread passing arm 518 and a thread presser body 581. . The thread presser body 581 is rotatably attached to a shaft crimped to the thread passing arm 518, and the thread presser portion 581a formed on the thread presser body 581 is driven by the force of the torsion coil spring 582. It is pressed against the thread retainer 519 of 518. Reference numeral 583 denotes a thread guide body. The thread guide body 583 is rotatably attached to the thread passing arm 518 and is urged clockwise by a torsion coil spring 585. The thread guide body 583 is in a threading standby state in which a shaft 586 (see FIG. 24) is pressed against a contact portion 579a of a switching plate 579, which will be described later, and a thread passing arm thread presser 519 and a thread presser body thread presser. A guide groove 584 for guiding the yarn is provided between the portion 581a.

  The switching plate 579 is slidably attached to the yarn passing arm 518 and is urged to the left in the drawing by the force of the tension coil spring 575. The switching plate 579 has a contact portion 579a for pressing the thread guide body shaft 586 and contact portions 579a and 579b for pressing the other end portion 581a of the thread presser body 581 from the left and right. Reference numeral 578 denotes a switching operation body. The switching operation body 578 is rotatably attached to the yarn passing arm 518, and attaches a contact portion 578a for pressing the switching plate 579, a stopper portion 578b, and a wire 576. And a screw hole 578c. The switching actuating body 578 is biased by the force of the torsion coil spring 537 in a direction in which the switching plate 579 and the switching actuating member contact portion 578a are separated (direction in which the wire 576 is pulled). The direction of the wire 576 attached to the switching operation body 578 is changed by a roller 577, and the opposite end is attached to the switching body 533. The switching body 533 is rotatably attached to the yarn passing arm 518, and has an abutting portion 533a that abuts on an abutting plate 538 fixed to the frame, and an operating hook that abuts on a cam 522 provided on the operating gear 517. 543.

  Further, the yarn passing arm 518 is integrally provided with a lever portion 539 protruding from the yarn passing shaft 516 to the opposite side. A support roller 541 is rotatably attached to the distal end portion of the lever portion 539, and is configured to swing integrally as the yarn passing operation gear 517 rotates.

  On the other hand, a yarn passing guide plate 542 for guiding the support roller 541 provided on the lever portion 539 is fixed so as to be adjacent to the side portion of the rack gear 513. This yarn passing guide plate 542 is composed of two stages of linear guide portions 542a and 542b. That is, the support roller 541 of the lever portion 539 comes into contact with the upper linear guide portion 542a provided so as to protrude to the front side of the sewing machine (the right side in FIG. 12), so that the yarn passing arm 518 is threaded. Regardless of the rotation of the operating gear 517, it is locked at a pivot position that projects obliquely downward. Further, when the support roller 541 of the lever portion 539 comes into contact with the lower linear guide portion 542b provided so as to be slightly retracted to the back side of the sewing machine (left side in FIG. 12), the yarn passing arm 518 is slightly below the side. Will be rotated. As a result, the yarn passing arm 518 is locked at the rotational position depending on the vertical downward direction, as indicated by the two-dot chain line in FIG. 12, regardless of the rotation of the yarn passing operation gear 517. Yes.

  Here, the switching body 533 is integrally provided with an operation hook 543 so as to extend outward in the radial direction. When the yarn passing arm 518 is rotated to the lowest position as described above (see the two-dot chain line in FIG. 12), the operating hook 543 is in the radial direction of the projection 522 provided on the yarn passing operating gear 517. The positional relationship is set so as to ride on the tip portion. When the operation hook 543 rides on the protrusion 522 of the yarn passing operation gear 517, the switching body 533 is rotated by the amount of the ride. Accordingly, the pressure contact force of the thread presser body 581 with respect to the thread presser portion 519 by the pressure applying torsion coil spring 582 is weakened.

  Next, the operation of the yarn passing arm 518 will be described with reference to FIGS. First, what is shown in FIG. 20 (X) is the yarn hooking standby position of the yarn passing arm 518, that is, the position shown in FIG. At this time, since the switching body abutting portion 533a is in contact with the abutting plate 538, the switching body 533 is rotating. The switching operation body 578 linked to the switching body 533 with the wire 576 also resists the force of the torsion coil spring 537 and further resists the force of the tension coil spring 575 applied to the switching plate 579. It has pushed and rotated and is in the position shown in FIG. At this position, the thread presser body 581 is pressed by the switching plate contact portion 579a, and the thread presser body thread presser portion 581a is separated from the thread passing arm thread presser portion 519. Further, the thread guide body 583 is in a state in which the thread guide body shaft 586 is pushed by the switching plate contact portion 579a and covers the thread passing arm thread presser portion 519 as shown in FIG.

  When the drive shaft 501 is rotated and the yarn passing arm 518 is rotated and lowered as shown in FIG. 20Y, the switching body 533 is separated from the contact plate 538, and the switching operation body 578 is the force of the torsion coil spring 537. 22 and stops at a position where the stopper 578b hits the yarn passing arm 518 as shown in FIG. The switching plate 579 is also moved by the force of the tension coil spring 575 and stops at a position where the end portion 581b of the thread presser body 581 and the switching plate contact portion 579b contact each other. At this time, the force that presses the thread presser body thread presser 581a against the yarn passing arm thread presser 519 is the force of the torsion coil spring 582 and the force of the tension coil spring 575. Accordingly, the thread guide body 583 is rotated by the force of the torsion coil spring 585 to a position where the thread guide body shaft 586 contacts the thread passing arm 518 as shown in FIG.

  When the drive shaft 501 further rotates and the thread passing arm 518 moves to the threading standby position as shown in FIG. 20 (Z), the switching body operating hook 543 comes into contact with the operating gear cam 522, so that the switching body. 533 rotates, the switching operation body 578 interlocked with the wire 576 also rotates, and the switching plate 579 moves as shown in FIG. The position where the switching plate 579 has moved is such that the switching plate contact portion 579b and the thread presser end portion 581b are separated from each other, and the switching plate contact portion 579c and the thread guide body shaft 586 are in contact with each other as shown in FIG. The position is not in contact. Therefore, the force that presses the thread presser body thread presser 581a against the thread passing arm thread presser 519 is only the force of the torsion coil spring 582. As described above, there is provided a variable presser pressure means for changing the presser force of the thread by the thread presser portions 519 and 581a of the yarn transfer gripping part 580 into three stages of opening, strong and weak depending on the position of the thread passing arm 518. Yes.

  Furthermore, as shown in FIGS. 1, 8, and 9, the thread hooking means 600 for mounting the upper thread passed through the sewing needle N by the threading means 300 on the thread hooking portion 8 a of the balance 8 is disposed. . The yarn hooking means 600 also serves as a yarn feeding stepping motor 601 as a drive source. A yarn feeding roller 602 is fixed to the output shaft of the yarn feeding stepping motor 601. An intermediate gear 605 that is rotatably fixed on the motor mounting plate 604 is always meshed with a drive gear 603 that is integrally formed with the yarn feeding roller 602.

  On the other hand, on the motor mounting plate 604, a presser lifting mechanism (not shown) or a thread feeding swinging plate 606 that moves in conjunction with an automatic thread trimming device is rotatably mounted at a predetermined position. A thread take-up tension coil spring 607 is hung on one end side of the yarn take-out swing plate 606 with the motor mounting plate 604, and the other end side of the yarn take-out swing plate 606 is away from the intermediate gear 605. It is tensioned. Further, one end side of the auxiliary roller mounting plate 608 is rotatably connected to the other end side of the yarn feeding swinging plate 606, and the other end side of the auxiliary roller mounting plate 608 is erected on the motor mounting plate 604. The support pin 609 is slidably mounted.

  On the auxiliary roller mounting plate 608, a pair of auxiliary rollers 611 and 611 are rotatably provided so as to come into contact with the yarn payout roller 602 by the urging force of the yarn payout tension coil spring 607. A driven gear 612 is integrally formed with each of these auxiliary rollers 611, and when the auxiliary rollers 611 and 611 come into contact with the yarn feeding roller 602, the driven gear 612 of each auxiliary roller 611 is the yarn feeding roller 602. Is engaged with the drive gear 603. The yarn feeding roller 602 is provided so as to be exposed from a long hole formed in the auxiliary roller mounting plate 608.

  Further, a second intermediate gear 605 a provided integrally with the intermediate gear 605 is exposed from the long hole of the auxiliary roller mounting plate 608. A thread take-up operation gear 613 is rotatably provided on the auxiliary roller mounting plate 608 so as to be adjacent to the second intermediate gear 605a. The thread take-up operation gear 613 is arranged so as to come into contact with and separate from the intermediate gear 605 by sliding with the auxiliary roller mounting plate 608. That is, as described above, when the auxiliary rollers 611 and 611 come into contact with the yarn take-out roller 602, the yarn take-up operation gear 613 is in non-engagement with the intermediate gear 605, and the yarn take-out roller 602 to the auxiliary roller 611. , 611 are separated from each other, the thread take-up operation gear 613 is engaged with the intermediate gear 605.

  A thread hooking first arm 614 having a crank shape is attached to the thread take-up operation gear 613 so as to swing by rotation of the thread take-up operation gear 613. A thread hook second arm 615 is attached to the swing arm side of the thread hook first arm 614 so as to slide in the arm direction of the thread hook first arm 614. A thread take-up hook 616 having a known structure is attached to the tip end portion of the thread hook second arm 615.

  As is well known, the thread take-up hook 616 has a thread take-up spring 617 that engages with a middle portion of the upper thread passed through the sewing needle N by the threading means 300 in a thread take-up bracket 619 provided with a thread guide groove 618. I have. The thread take-up bracket 619 is rotatably attached to the tip end portion of the thread hook second arm 615 by a thread take-up shaft 620. An upper guide shaft 621 and a lower guide shaft 622 provided in the thread take-up bracket 619 slide on a guide path 624 of a curved thread take-up guide member (face plate) 623 disposed adjacent to the balance 8. Thus, the upper thread clamped by the thread take-up spring 617 is threaded onto the thread hooking portion 8a of the balance 8. The upper guide shaft 621 and the lower guide shaft 622 are pressed onto the guide path 624 of the thread take-up guide member 623 by a thread take-up torsion coil spring 625 that applies a rotational biasing force to the thread take-up bracket 619.

  Further, a thread take-up engagement groove 626 extending obliquely downward is extended at the lower end portion of the guide path 624 of the thread take-up guide member 623. In the thread take-up engagement groove 626, upper and lower guide shafts 621 and 622 are arranged to be fitted. As shown also in FIG. 11, when these guide shafts 621 and 622 are fitted in the thread take-up engagement groove 626, the thread take-up bracket 619 is locked at the lower end position. Has been. Further, a tension coil spring 627 is attached to the middle portion of the yarn hooking second arm 615 with the motor mounting plate 604. With the tension of the tension coil spring 627, the thread trimming bracket 619 is held at the lower end position described above.

  Here, as shown in FIG. 11, the thread take-up torsion coil spring 625 is set on the thread take-up spring receiver 651 and screwed to the thread take-up bracket 619. A thread breakage shielding cylinder 652 is rotatably attached to the thread take-up spring receiver 651, and a thread take-up torsion coil spring 625 is inserted into a groove formed in the thread breakage shielding cylinder 652. Accordingly, when the thread take-up torsion coil spring 625 is bent, the thread breakage shielding cylinder 652 rotates. A thread break shielding plate 653 is formed in the thread break shielding cylinder 652, and this thread break shield plate 653 is threaded when a thread take-up hook 616 (thread take-up bracket 619) is in a sewing position. The photosensor 654 attached to 623 is opened and closed. That is, the photo sensor 654 serves as a thread break sensor (thread break detecting means).

  On the other hand, as shown in FIGS. 8 and 10, at the lower end portion of the needle swinging swing base 401 of the needle swinging mechanism 400, the swing end portion of the needle swinging arm 406 reciprocated in the left-right direction by the needle swinging stepping motor 405 is provided. Are rotatably connected. Through this needle swinging arm 406, the needle swinging swinging table 401 has an upper portion of the needle plate substantially centered on the left / right swinging shaft 403 and the front / rear swinging shaft 404 provided at the upper end portion of the needle swinging swinging table 401. It is configured to swing in an arc shape. A needle swing link 407 is provided at the proximal end portion of the needle swing arm 406. The tip end portion of the needle swing link 407 is in pressure contact with the outer peripheral cam surface of the needle swing cam 408 that is rotationally driven by the needle swing stepping motor 405 by the tension biasing force of the needle swing tension coil spring 409. Accordingly, the above-described needle swinging operation is performed according to the outer peripheral shape of the needle swing cam 408.

  Here, a thread take-up cam 630 is fixed to the rotation shaft 411 of the needle swing cam 408. A swing arm 631a on one side of the thread take-up switching plate 631 is in contact with the outer peripheral cam surface of the thread take-up cam 630 from below. The thread take-up switching plate 631 is rotatably mounted on the switching shaft 632. The other oscillating arm 631b extending upward of the thread take-up switching plate 631 is in a locking hole 634 provided in one oscillating arm of the thread take-up spring stopper 633 arranged to be rotatable in a horizontal plane. Is inserted in a loosely fitted state.

  Further, a thread take-up stopper plate 635 is formed on the other swing arm of the thread take-up spring stopper 633 so that it is bent downward. The thread take-up stopper plate 635 is arranged to be engaged with the middle portion of the yarn hooking second arm 615 by the rotational biasing force of the stop torsion coil spring 637 attached to the rotary shaft 636 of the yarn take-up spring stopper 633. Accordingly, the swinging of the yarn hooking second arm 615 is restricted.

  When the thread take-up cam 630 is rotated integrally with the needle swing cam 408 and the protruding cam portion provided on the thread take-up cam 630 comes into contact with the thread take-up switch plate 631, the thread take-up switch plate 631 and the thread take-up stopper plate 635 are used. Is rotated, and the thread take-up stopper plate 635 is separated from the yarn hooking second arm 615 and is opened. Thereby, the rotation operation of the thread hook second arm 615 is allowed.

  Further, as shown in FIG. 1, an upper base tension plate 640 for guiding the upper thread guided to the balance 8 is disposed on the upper side of the motor mounting plate 604 of the yarn hooking means 600. The lower base tension plate 642 is in close contact with the lower surface side of the upper base tension plate 640 by the urging force of the compression coil spring 641 attached to the shaft extending downward from the upper base tension plate 640.

  The embroidery sewing machine with a thread changing device described above is provided with a front panel for various operations (not shown), and an operation panel 70 for thread replacement as shown in FIG. 27 is provided on the front panel. It has been. On the operation panel 70 for this thread exchange, as shown in the figure, a thread selection start switch (A) 71, a thread selection start switch (B) 72, a thread selection start switch (C) 73, a thread hooking start switch 74, A winding start switch 75 and continuous exchange start switches 76 and 77 are provided.

  Here, the continuous exchange start switch 76 performs threading from A in the yarn winding device 100 and the yarn selection / conveyance device 200, exchanges it with B and C, and after C, returns to A and returns to B and C. The switch is activated to repeat the above operation until the completion of the second color thread sewing of the embroidery sewing. On the other hand, the continuous exchange activation switch 77 is a switch for starting the operation of threading from C, exchanging with B and A, and repeating the above. Above continuous replacement activation switches 76 and 77, continuous replacement instruction display units 76a and 77a using LEDs for displaying that each continuous replacement is instructed are provided.

  FIG. 28 is a control block diagram of the sewing machine. The central control unit 80 includes a microcomputer, a ROM, a RAM, an I / O port, and the like, and is connected with a key matrix 78, a thread breakage sensor 654, a spindle sensor 91, and the like. Yes. Further, a sewing machine motor 90 is connected to the central controller 80 via a drive circuit 81, and each of the stepping motors 130, 210, 330, 601, and 405 has a drive circuit 82, 83, 84, 85, and 86 connected thereto. Connected through. The key matrix 76 includes the thread selection start switches 71, 72, 73, the thread hooking start switch 74, the winding start switch 75, the continuous exchange start switches 76, 77, and the like.

  Next, how to set the upper thread will be described. First, when setting the upper thread at the position A, the thread winding 11A is set on the thread winding support rod 101A, and the winding wheel 108A is rotated by hand when it is horizontal to make it vertical. Then, after the upper thread is pulled out from the thread winding 11A and threaded on the thread hooking part 116a of the thread guide rod 116, it is threaded on the thread hook 231A of the moving base cover 230, and the upper thread is passed along the guide groove 232A. As a result, the upper thread is put into the thread gripping part 221A. That is, an upper thread is put between the thread hooking tension plate 222 and the thread presser plate 223, and the upper thread is cut by the thread trimming blade 225 attached to the thread trimming guide base 224. At this time, the upper thread is hung from the thread gripping part 221A by a predetermined length. Note that when the upper thread is set at the positions B and C, the thread windings 11B and 11C are set on the thread winding support rods 101B and 101C, respectively.

  Next, the operation of threading and threading the upper thread set at the position A as described above will be described. When the operator presses the thread selection starting switch (A) 71 and presses the thread hooking starting switch 74, the feed stepping motor 210 is driven, and the moving table 220 moves on the rotating feed screw 201, thereby moving. The stand 220 stops at the yarn hooking position (A) where the yarn hanging from the yarn gripping portion 221A is located in front of the guide groove 584 of the yarn guide body 583 provided in the yarn passing arm 518.

  A presser lifting mechanism (not shown) or an automatic thread trimming device is operated to move the yarn feeding rocking plate 606 of the yarn hooking means 600 so as to separate the auxiliary rollers 611 and 611 from the yarn feeding roller 602, and the intermediate gear 605. The thread take-up operation gear 613 is engaged with the second intermediate gear 605a. At the same time, the thread take-up stopper plate 635 is removed by the needle swinging stepping motor 405 and the rotation of the thread hooking second arm 615 is allowed.

  Thereafter, a stepping motor for thread passing and threading (not shown) (see reference numeral “330” in FIG. 28) is driven to rotate forward over a predetermined number of steps, whereby the drive shaft 501 is rotated and the internal working body 506 is rotated. At the same time, the external operating body 505 descends. Accordingly, the yarn passing arm 518 is lowered while being rotated by the rack gear 513.

  Further, as the thread passing arm 518 rotates and descends and the switching body contact portion 533a moves away from the contact plate 538, the thread presser body thread presser portion 581a rotates in the direction of the thread passing arm thread presser portion 519, and the thread guide. The body 583 rotates in the clockwise direction. When the switching body contact portion 533a and the contact plate 538 are completely separated from each other, the upper thread moves between the thread presser body thread presser portion 581a and the thread passing arm thread presser portion 519 and the force of the torsion coil spring 582 and the tension coil spring 575. As shown in FIG. 29, the thread winding side of the pinned upper thread is caught in the thread guide guide groove 584.

  When the yarn passing arm 518 is rotated and lowered to the position where the upper yarn is captured, the feed stepping motor 210 is driven to move the moving table 220, and the take-up switching plate 240 fixed to the moving table 220 is operated. It stops at the position where it comes into contact with the contact portion 141a of A141. When the operation plate A contact portion 141 a is pushed down by the winding switching plate 240, the arm portion 141 b of the operation plate A 141 pushes up one end of the operation restriction plate A 121, so that the operation body 106 A is wound by the force of the compression coil spring 105. Lower in the direction of the take-up pulley 107A. As a result, the operating body 106A is connected to the winding pulley 107A via the protrusions 106b and 107a, and therefore the winding body 104A including the winding wheel 108A is rotationally driven by the winding stepping motor 130. Is possible.

  At the same time, the yarn take-up hook 616 is moved to the upper end position along the guide path 624 by driving the yarn feeding stepping motor 601 to rotate forward several steps. The movement of the thread take-up hook 616 is performed while the thread take-up second arm 615 slides and contracts with respect to the thread take-up first arm 614. Therefore, the movement locus of the thread take-up hook 616 is set to a minimum overhang amount. The sewing machine can be downsized and the appearance can be improved.

  In the yarn passing arm 518 that has been rotated and lowered for the above-described time, the support roller 541 provided in the lever portion 539 contacts the upper linear guide portion 542a of the yarn passing guide plate 542, and the yarn passing arm 518 is the other. It descends in a state where the rotation is stopped at a position where it does not contact the member. By doing so, the yarn passing arm 518 can be lowered with the overhang amount minimized, and the appearance of the sewing machine can be reduced in size. At this time, the upper thread is drawn into the thread guide body guide groove 584.

  Next, when the thread pushing latching portion 511 of the internal operating body 506 contacts the latching portion 317 of the threading lever 306 from above, the threading lever 306 is pushed downward by a predetermined amount, and the actuation pin 310 abuts against the threading positioning stopper 302 of the needle bar 5 from the upper side in the axial direction. As a result, the threading shaft 305 stops at a height position where the threading hook 313 provided on the threading hook holder 308 matches the eye of the sewing needle N. Immediately after the threading shaft 305 stops in this way, the external operating body 505 comes into contact with the threading stopper 318 of the threading shaft 305 from above, and the downward movement of the external operating body 505 is also stopped.

  Before the downward movement of the external operating body 505 stops, the support roller 541 provided in the lever portion 539 comes into contact with the lower linear guide portion 542b. As a result, the thread passing grip 580 is rotated to a region inside the sewing needle N. This is shown in the position shown in FIG. At this time, the upper thread which is sandwiched between the thread retainer body thread retainer 581a and the thread passing arm thread retainer section 519 and hooked in the thread guide body guide groove 584 and tensioned therebetween is It is adjusted to be located in front of the eye hole. Further, since the switching body operation hook 543 is in contact with the operation gear cam 522, the force for pressing the thread presser body thread presser 581a against the thread passing arm thread presser 519 is only the force of the torsion coil spring 582.

  Thereafter, when the threading lever 306 is further lowered together with the internal operating body 506, the operating pin 310 is rotationally guided along the inclined groove cam 311a. Since the upper thread is passed through the thread guide 10 of the needle stopper 9 in the hooked state, the upper thread supply path is well formed. Then, the thread take-up hook 616 enters the needle hole.

  Furthermore, when the yarn take-up hook 616 moves downward and hooks the middle portion of the upper yarn by the reverse of the yarn feeding stepping motor 601, the upper yarn on the upstream side of the yarn winding side from the yarn take-up hook 616 becomes a predetermined guide member. Accordingly, the upper thread on the downstream side closer to the sewing needle N side than the thread take-up hook 616 is set to be placed on the middle part of the balance 8.

Next, the needle swing cam 408 is returned to the original position by the needle swing stepping motor 405 and the thread take-up stopper plate 635 is returned to the locking position to lock the rotation of the thread hooking second arm 615. At this time, the upper thread is sandwiched between the thread feeding roller 602 and the auxiliary rollers 611 and 611. Further, the thread take-up hook 616 that has reached the lower end position is shown in FIG.
As shown in FIG. 5, the thread take-up engagement groove 626 holds the position.

  Thereafter, by rotating the drive shaft 501 in the reverse direction, the thread take-up hook 616 hooks the upper thread stretched in front of the needle hole and pulls it into the needle hole. At this time, since the upper thread is sandwiched between the thread presser body thread presser 581a and the thread passing arm thread presser 519 with a weak force of only the torsion coil spring 582, the thread passing hook 616 is drawn from the thread catching grip 580. And is passed through the needle hole. When the rotation of the thread take-up hook 616 is finished, the thread passing arm 518 is rotated up and returned to the thread catching standby position. As described above, the threading and threading of the upper thread set at the position A is completed, and the preparation for winding is completed. The upper thread set at the positions B and C can be similarly threaded and threaded, respectively.

  Next, a method for winding the yarn around the bobbin 11 will be described. When the upper thread is wound for exchanging the upper thread after completion of the predetermined sewing, and the upper thread is connected to the needle, the upper thread is cut by an automatic thread trimming device (not shown) provided in the sewing machine and wound. When the take-up switch 75 is pressed, winding is started. That is, as described above, since the moving table 220 is in a position where the winding switching plate 240 is in contact with the operation plate A contact portion 141a, the winding body 104A can be driven to rotate by the winding stepping motor 130. is there. Accordingly, when the winding stepping motor 130 is driven and the winding body 104A is rotated in the clockwise direction in plan view, the operating body protrusion 109a of the winding wheel A comes into contact with the bobbin winder cover protrusion 112, thereby winding the winding body 104A. The handle 108A is tilted by the force of the torsion coil spring 119, and is maintained in a substantially horizontal state.

  In the subsequent rotation, the take-up wheel V-shaped portion 108c rotates the yarn between the yarn winding 11A and the yarn guide rod yarn hooking portion 116a, and the upper yarn becomes the yarn winding 11A as shown in FIG. Wrap around. Here, the winding stepping motor 130 rotates by a predetermined amount and stops. The amount of rotation is set to an amount at which the upper thread in the yarn path is completely wound around the spool 11A. As described above, the upper thread can be wound around the bobbin 11A.

  Here, in the thread winding device 100, the winding wheel 108 is positioned substantially vertically during sewing, and the upper thread consumed for sewing is pulled out so as to be loosened from the thread winding 11, so that it is unnecessary for the upper thread. Does not generate resistance. The take-up switching plate 240 is set at the positions B and C by moving the moving base 220 to positions where the winding plate 220 abuts on the actuating plate B abutting portion 142a and the actuating plate C abutting portion 143a, respectively. Similarly, the upper thread can be wound around each of the thread windings 11B and 11C.

  The embroidery sewing machine equipped with the device of the above embodiment can continuously perform the above-described automatic threading, threading and thread winding operations when performing embroidery sewing using a large number of colored threads. it can.

  Next, the operation when sewing an embroidery that uses upper thread of three or more colors will be described. First, the operator selects a desired embroidery by using an embroidery operation panel (not shown). Subsequently, for example, the first colored thread to be sewn is set at the position A in the manner described above. Similarly, the second colored thread is set at the position B, and the third colored thread is set at the position C. Then, when the continuous exchange start switch 76 is pressed, the first colored thread set at the position A is automatically threaded and threaded as described above, and after the automatic threading and threading is completed, When the operator turns on a sewing machine start switch (not shown), embroidery sewing of the first color thread starts.

  When the sewing of the first color thread is completed, the first color thread is cut by the automatic thread trimming device. At this time, the sewing machine sounds a buzzer to inform the operator that the first color thread has been sewn. After the first color yarn is cut, the winding stepping motor 130 is driven, and as described above, the first color yarn is wound around the thread winding 11A set on the thread winding support rod 101A. When the winding of the first color yarn is completed, the moving table 220 moves to the B threading position of B, automatic threading and threading are performed, and after the completion, the sewing of the second color yarn is automatically started. The

  After the second color thread has been sewn, the second color thread is wound up and the third color thread set at position C is automatically threaded and threaded. Thread sewing starts. Here, the operator removes the thread windings 11A and 11B wound on the thread winding support rods 101A and 101B, respectively, and then sets the fourth color thread at the position A and 5 Set the 2nd color thread at position B. When the sewing of the third color thread is completed, the upper thread is automatically replaced with the fourth color thread, and when the sewing of the fourth color thread is completed, the upper thread is automatically replaced with the fifth color thread. When the last color thread has been sewn, the sewing machine stops.

As described above, according to the present invention, the effects listed below can be obtained.
(1) Since the yarn selection / conveyance device 200 selects the yarns in order from the end to perform the yarn exchange, the operation is easily understood.
(2) Since the yarn stretched up and down is captured by the yarn passing grip portion 580 of the yarn passing arm 518, the catching is surely performed.
(3) The thread winding device 100 is pulled out so that the thread is loosened from the thread winding 11 during sewing, and does not unnecessarily apply tension to the upper thread during sewing.
(4) Since the yarn winding device 100 and the yarn selection / conveyance device 200 are unitized so that they can be easily removed from the sewing machine main body, the sewing machine main body is easy to carry.
(5) Since the pressing force of the thread passing gripping portion 580 that presses the upper thread of the thread passing arm 518 is changed in three stages: open, strong, and weak, the thread catching and needle hole threading are reliably performed. .

  <Modification> FIG. 31 is a perspective view showing a modification of the parts provided on the moving table 220 and including a thread passing grip 580. In the drawing, reference numeral 250 denotes a thread setting table fixed on the moving table 220. The thread setting table 250 includes a thread setting table 250 when the moving table 220 moves in the direction of the yarn passing arm 518. In order not to interfere with the portion 580 and the thread guide body 583, an opening 260 is formed which is opened to the front side and penetrates in the lateral direction. Three sets of thread hooks 251 are provided on the upper surface of the thread setting base 250, that is, pulled out from the thread windings 11A, 11B, and 11C set on the three thread winding support rods 101A, 101B, and 101C, respectively. Three thread hooks 251A, 251B, and 251C for hooking the upper thread are provided side by side.

  A first tension plate 252 is fixed to the front side of the thread setting table 250 and on the upper side of the opening 260. The three tension shafts 253, 253, and 253 are caulked to the first tension plate 252. Are provided with first thread retainer plates 254A, 254B, 254C, respectively. The three first thread presser plates 254A, 254B, and 254C are pressed against the first tension plate 252 by the force of the compression coil springs 255, 255, and 255, respectively. A second tension plate 256 is fixed to the front surface of the yarn setting table 250 and on the lower side of the opening 260, and the second yarn is formed in the three holes formed in the second tension plate 256. The shafts 258, 258, 258 of the pressing plates 257A, 257B, 257C are inserted and fixed from the back side. The three second thread presser plates 257A, 257B, and 257C are in pressure contact with the second tension plate 256 by the force of the compression coil springs 259,.

  As described above, three sets of upper and lower tension applying portions are provided. A slit groove 261 is formed along the lower portion of the second tension plate 256 at the lower front surface of the yarn set 250, and three yarn guide grooves 262A, 262B, 262C are formed. Thread cutting blades 263, 263, and 263 are attached to the three thread guide grooves 262A, 262B, and 262C, respectively.

  Next, a yarn setting method will be described. FIG. 31 shows a state where the upper thread A is set at the position A. Similarly to the above-described embodiment, the thread winding 11A is set on the thread winding support rod 101A, the take-up wheel 108A is set in a substantially vertical state, the upper thread A is pulled out from the thread winding 11A, and the thread guide rod thread hook After threading the portion 166a, the upper thread A is threaded on the thread hook 251A of the thread setting base 250 as shown in the figure. Then, the yarn is hooked between the first tension plate 252 and the first yarn presser plate 254A, and further, the yarn is hooked between the second tension plate 256 and the second yarn presser plate 257A, and the yarn guide groove 262A is inserted. The thread A is put and the thread A is cut by the thread cutting blade 263.

  As a result, as shown in the drawing, the upper thread A is stretched between the first tension plate 252 and the first thread presser plate 254A and the second tension plate 256 and the second thread presser plate 257A. Similarly, the upper thread is also set at the positions B and C. Thus, during automatic threading and threading, as shown in the figure, the first tension plate 252 and the first thread presser plate 254A are stretched between the second tension plate 256 and the second thread presser plate 257A. The yarn A can be reliably guided into the guide groove 584 of the yarn guide 583.

  In the above embodiment, the embroidery sewing machine is used. However, the present invention is not limited to this, and other sewing machines may be used. Moreover, the shape of various parts is arbitrary, and it is needless to say that other specific detailed structures can be appropriately changed.

1 is a schematic perspective view showing an automatic threading / threading device, a thread winding device, and a thread selecting / conveying device of an embroidery sewing machine as an example of a sewing machine to which the present invention is applied. FIG. 2 is an enlarged view of the automatic threading / threading device (threading means, thread passing means, and threading means) of FIG. 1. It is the perspective view which showed the connection structure of an upper axis | shaft and its periphery. It is the expansion perspective view which showed the drive system of the thread passing means of FIG. 1, and the threading means. It is the expansion perspective view which showed the structure of the threading means of FIG. FIG. 6 is an enlarged plan view showing a structure of a threading hook in the threading means of FIG. 5. It is the expansion perspective view which showed the threading hook of FIG. It is the expansion perspective view which showed the structure of the automatic threading means and needle swing mechanism of FIG. It is the enlarged front view which showed the automatic threading means of FIG. FIG. 9 is an enlarged side view showing a connection relationship between the automatic threading means and the needle swing mechanism in FIG. 8. FIG. 10 is a plan view showing the structure of the periphery of the thread take-up bracket of FIG. 9. FIG. 2 is an enlarged front view showing the structure of the thread passing means and the threading means of FIG. 1. FIG. 2 is an enlarged view of the yarn winding device and the yarn selection / conveying device of FIG. 1. FIG. 14 is an exploded perspective view of the yarn winding device and the yarn selection / conveying device of FIG. 13. FIG. 15 is an enlarged view of the yarn winding device of FIG. 14. It is an enlarged view of the thread | yarn selection conveyance apparatus of FIG. FIG. 16 is a longitudinal side view of a yarn winding support bar and a yarn winding mechanism in the yarn winding device of FIG. 15. It is the side view which expanded and showed the structure of the V-shaped part of the winding wheel in FIG. It is the disassembled perspective view which expanded and showed the yarn passing arm in FIG. 1, and its each component. The movement mode of the yarn passing arm is shown. (X) is a side view showing an upward state, (Y) is a side view showing a halfway state of rotation lowering, and (Z) is a side view showing a downward state. is there. FIG. 21 is a plan view corresponding to FIG. 20X, showing a change state of the yarn passing gripping portion. FIG. 21 is a plan view corresponding to FIG. 20Y, showing a change state of the yarn passing gripping portion. FIG. 21 is a plan view corresponding to FIG. 20 (Z), showing a change state of the yarn passing gripping portion. FIG. 22 is a front view corresponding to FIG. 21, showing a movement mode of the switching plate. FIG. 23 is a front view corresponding to FIG. 22, showing a moving mode of the switching plate. FIG. 24 is a front view corresponding to FIG. 23, showing a moving mode of the switching plate. It is the front view which showed the operation panel for threading with which a sewing machine is equipped. It is a control block diagram of a sewing machine. It is an expansion perspective view which shows the state which hung the upper thread | yarn on the thread passing holding part. It is the perspective view which showed the state which winds up a thread | yarn around a bobbin. It is the perspective view which showed the modification of the components with which a movable stand is equipped, and showed the thread | yarn passing grip part.

Explanation of symbols

A Upper thread N Sewing needle 1 Upper shaft 5 Needle bar 8 Balance 9 Needle clamp 10 Thread guide 11 Bobbin 70
71, 72, 73 Thread selection start switch 74 Threading start switch 75 Winding start switch 76, 77 Continuous exchange start switch 80 Control device 90 Sewing machine motor 100 Thread winding device 101 Thread winding support rod 103 Thread winding tray 104 Winding body 106 Actuator 108 Winding wheel (yarn winding member)
109 Actuator 110 Mounting plate 112 Projection 120 Base plate 121, 122, 123 Operation restriction plate 130 Winding stepping motor (drive source)
141, 142, 143 Actuating plate 200 Yarn selection and conveyance device 201 Feed screw 210 Feed stepping motor (drive source)
220 Moving base 221 Thread gripping part 222 Thread holding tension plate 223 Thread holding plate 224 Thread trimming guide base 225 Thread trimming blade 230 Moving base cover 231 Thread hook 232 Thread guide groove 234 Opening 240 Winding switching plate 250 Thread setting base 251 Thread Hanging 252 First tension plate 254 First thread presser plate 256 Second tension plate 257 Second thread presser plate 260 Opening 262 Thread guide groove 263 Thread trimmer blade 300 Threading means 302 Threading positioning stopper 305 Threading shaft 306 Threading Lever 308 Threading hook holder 310 Actuating pin 311 Groove cam 313 Threading hook 317 Locking portion 325 Needle stop threading 330 Thread passing and threading stepping motor 400 Needle swing mechanism 405 Needle swing stepping motor 500 Thread passing means 501 Drive shaft 505 External working body 506 Internal working body 5 11 Thread Push Locking Section 513 Rack Gear 517 Thread Transfer Operation Gear 518 Thread Transfer Arm (Thread Transfer Member)
519 Yarn presser portion 522 Protruding portion 523 Locking pin 533 Switching body 538 Contact plate 539 Lever portion 541 Support roller 542 Thread passing guide plate 543 Actuating hook 576 Wire 577 Roller 578 Switching actuating body 579 Switching plate 580 Thread passing grasping portion (thread) Capture part)
581 Thread presser body 583 Thread guide body 584 Guide groove 586 Thread guide body shaft 600 Thread hooking means 601 Thread feeding stepping motor 602 Thread feeding roller 605 Intermediate gear 605a Second intermediate gear 606 Thread feeding swinging plate 611 Auxiliary roller 613 Thread take-up operation Gear 614 Thread catching first arm 615 Thread catching second arm 616 Thread take-up hook 624 Guide path 626 Thread take-up engagement groove 635 Thread take-up stopper plates 640 and 642 Base tension plate 654 Thread breakage detecting means

Claims (2)

In a sewing machine equipped with an automatic threading and threading device that transfers the upper thread drawn from the thread winding and inserts it into the eye of the sewing needle,
A thread supply source capable of setting a plurality of thread windings, and a plurality of thread gripping portions respectively holding upper yarns drawn from the plurality of thread windings set in the thread supply source. A yarn selection / conveying device capable of conveying the automatic threading / threading device so as to selectively catch the yarn,
The thread supply source includes a thread winding member that can rotate around the thread winding, retracts to a position that does not hinder the flow of the thread pulled out from the thread winding during sewing, and changes its posture in a direction substantially perpendicular to the thread winding during thread winding. A sewing machine characterized by being provided.   A yarn winding device having the yarn winding member and a drive source for rotating the yarn winding member, and the yarn winding device and the yarn selection / conveyance device are each unitized so as to be separable from the sewing machine body. The sewing machine according to claim 1.

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