JP2006346135A - Spangle sewing method in double chain stitch sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To automatically supply sequins continuously or at equal intervals or irregular intervals to zigzag stitches of double chain stitches and to sew them on a cloth. <P>SOLUTION: In a double chain stitch sewing machine provided with a sewing machine main shaft 6, a needle bar vertical movement mechanism 33, a needle swing mechanism A and a looper swing mechanism B, a spangle send-out device 40 for sending out the spangles 36 to a needle location position one by one by the drive of a stepping motor 39 is attached, a rotation detector 41 for making an ON signal flow at the optional angle of one rotation 360° of a sewing machine is attached to the end part of a sewing machine pulley 22, and a proximity sensor 42 is installed on the left end side of a looper shaft 28. The looper shaft 28 reaches the most left end position when a needle 18 attached to the lower end of a needle bar 4 reaches the bottom dead point of the first needle location, the left dead point of the looper shaft 28 is detected by the proximity sensor 42 at the time, the left dead point is defined as an origin, and the stepping motor 39 is driven and the spangles 36 are sent out simultaneously with some numbered ON operation of the rotation detector 41 from the origin. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method of sewing decorative sequins (also referred to as sequins) to a fabric in a double chain stitch sewing machine (double chain stitch picot sewing machine).

  Conventionally, as a method of sewing sequins to a cloth with a sewing machine, there are methods as shown in FIGS. 7 and 8, for example (see, for example, Patent Document 1). 7 and 8, a movable table 51 is provided on a virtual plane that intersects with the vertical movement locus of the sewing needle 50, and is erected on the side edge of the movable table 51 at a predetermined pitch P interval. The fabric 53 and the sequin 54 are locked to the locking member 52 in the inserted state, and the sewing machine is operated from this state, and the locking member 52 is sequentially positioned at the sewing position of the sewing needle 50. In addition, the movable table 51 is intermittently fed at the predetermined pitch P in conjunction with the vertical movement of the sewing needle 50, so that the sequin 54 is sewn to the fabric 53 along the seam formed by the sewing machine. is there.

  There is also an embroidery sewing machine in which a sequin supply device is attached to the embroidery sewing machine and the sequins are automatically supplied so as to be sewn on a work cloth (for example, see Patent Document 2).

Japanese Patent Laid-Open No. 9-760 JP 2004-167097 A

  In the above-described sequin sewing method using the sewing machine, the structure is complicated by attaching the movable table 51. In addition, it takes time to insert the fabric 53 and the sequin 54 into the locking member 52 in advance. There was some difficulty in sewing workability. The latter embroidery sewing machine has a problem that it is very expensive.

  The present invention has been made in order to solve such a problem, and the object of the present invention is to attach a sequin feeding device to a double chain stitch sewing machine and continuously connect to a double ring staggered seam. Alternatively, it is an object of the present invention to provide a sequin sewing method in a double chain stitch sewing machine which can automatically supply sequins at equal intervals or irregular intervals and sew them on the fabric.

  The sequin sewing method for the double chain stitch sewing machine according to the present invention includes a sewing machine main body, a needle bar vertical movement mechanism for reciprocating the needle bar in the vertical direction in conjunction with rotation of the sewing machine main shaft, and the sewing machine. A needle swing mechanism that translates the needle bar in the left-right direction orthogonal to the sewing progress direction in conjunction with the rotation of the main shaft, and the looper in the left-right direction together with the looper axis in conjunction with the parallel movement of the needle bar in the left-right direction. And a looper swinging mechanism for moving the needle bar and the looper in the left-right direction, wherein a plurality of nails of the needle plate can be formed with seams in the double chain stitch sewing machine. In addition, a sequin feeding device that feeds sequins one by one to the needle entry position by driving a stepping motor is attached, and the sewing machine is fixed to the end of the sewing machine spindle. A rotation detector that sends an ON signal at an arbitrary angle of 360 ° per rotation of the sewing machine is attached to the end of the roller, a proximity sensor is installed on the left end side of the looper shaft, and the needle attached to the lower end of the needle bar is the first The looper shaft reaches the leftmost position when the bottom dead center of the needle drop is reached.At this time, the proximity sensor detects the left dead center of the looper shaft and uses this as the origin. The stepping motor is driven simultaneously with the turning-on operation of the rotation detector to send out sequins.

  According to the method of the present invention, the sequin feeding device is attached to the double chain stitch sewing machine, the rotation detector is attached to the end of the sewing pulley, and the proximity sensor is attached to the left end of the looper shaft. The sequins can be sewn on the fabric by automatically supplying sequins to the stitches in a zigzag pattern of chain stitches at regular intervals or irregular intervals, so that the sequins can be sewn easily.

  A preferred embodiment of the present invention will be described with reference to the drawings. 1 is a front view of a double chain stitch sewing machine for carrying out the method of the present invention, FIG. 2 is a left side view of the double chain stitch sewing machine of FIG. 1, and FIG. 3 is a right side view of the double chain stitch sewing machine of FIG. 4 is a detailed view of the needle drop of the double chain stitch sewing machine of FIG. 1, FIG. 5 is a timing chart of the sequin feed in the double chain stitch sewing machine of FIG. 1, and FIGS. It is a top view which shows three examples of a sewing pattern.

  As shown in FIGS. 1 to 4, the double chain stitch sewing machine for carrying out the method of the present invention is equidistant from the sewing machine body 1 in the left-right direction perpendicular to the sewing progress direction X as shown in FIG. A needle plate 3 extending a plurality of claws 2, a needle swinging mechanism A that swings and moves the needle bar 4 in the left-right direction orthogonal to the sewing progress direction X as shown in FIG. 1, and the left-right direction of the needle bar 4 And a looper swing mechanism B that moves the looper 5 in the left-right direction orthogonal to the sewing progress direction X in conjunction with the swinging movement to the sewing machine.

  The needle swing mechanism A will be described. As shown in FIGS. 1 and 3, the needle swinging mechanism A is connected to a sewing machine main shaft (crankshaft) 6 supported in a horizontal posture on the sewing machine body 1 via a worm 7 and a worm gear 8. A vertical shaft 9 is erected inside, and a link mechanism 13 that swings around a fulcrum shaft 12 via a pair of upper and lower cam rollers 11 is provided on a needle swing cam 10 fixed to the upper end of the vertical shaft 6. The rod end portion 15a inserted into one end side of the needle swing connecting rod 15 and coupled with the screw 16 is movably coupled via the screw 17 to the vertically elongated hole 14 formed in one projecting piece 13a of the link mechanism 13. At the same time, the other end portion 15b of the needle swing connecting rod 15 is pivotally supported by a needle bar holder 20 that supports a predetermined number of needles 18 fixedly held at the lower end via a needle stock 19 so as to pass through and move up and down. Connect These needle swing cam 10, the link mechanism 13, the needle swing connecting rod 15 and the needle bar holder 20 is swung moved in the lateral direction perpendicular to the sewing direction of travel X of the needle bar 4 about the pivot axis 21.

In the needle swinging mechanism A, when the screw 17 is loosened and the rod one end 15a of the needle swinging connecting rod 15 is raised upward in the vertically long hole 14, the needle swinging width is increased, and when it is lowered, the needle swinging width is decreased. Next, by loosening the screw 6 provided at the rod one end 15a of the needle swing connecting rod 15 and finely adjusting the length of the needle swing connecting rod 15, the needle swing position can be obtained. As shown in FIG. 4, the needle 18 is aligned so as to fall to the center of the claw 2 and the claw 2 of the needle plate 3. In the example of FIG. 4, the needle drop position is 1, 2, 3, 4 from the left, and 4 is the right dead center. It will be 4, 5, 6, 1 from the right.
As shown in FIG. 1, the sewing machine main shaft 6 and a sewing machine motor (not shown) are hung between a sewing pulley 22 fixed to the right end of the sewing machine main shaft 6 and a driving pulley (not shown) on the motor shaft. It is transmitted by a power transmission belt (not shown).

  Next, the looper swing mechanism B will be described. As shown in FIG. 1, the looper swing mechanism B has an eccentric 23 fixed in the vicinity of the lower end portion of the vertical shaft 9. The looper swing mechanism B connects one end 24 a of the looper swing connecting rod 24 to the eccentric 23, The other end portion 24b of the looper swing connecting rod 24 is fixedly connected to a looper shaft 26 via a looper locker 27 to a looper holder 26 that holds the looper 5 around a fulcrum shaft 25 via a ball joint 29. By connecting the looper 5 with the eccentric 23, the looper swing connecting rod 24, the ball joint 29, the looper shaft 28, the looper rocker 27, and the looper holder 16, the needle bar 4 is moved in the lateral direction and the sewing progressing direction is interlocked. Move in the left-right direction orthogonal to X.

  In FIG. 1, a needle bar including a shaft connecting rod 30 for reciprocating the needle bar 4 in the vertical direction in conjunction with the sewing machine main shaft 6, a swing lever 32 swinging up and down around a fulcrum pin 31, and the like. A looper swinging movement mechanism 35 including a vertical movement mechanism 33 and a looper connecting lever 34 for reciprocally swinging the looper 5 to the left and right of the needle drop portion around the fulcrum shaft 25 in conjunction with the sewing machine main shaft 6. Since it is well known that this type of double chain stitch sewing machine is provided, detailed description thereof will be omitted.

  In the double chain stitch sewing machine configured as described above, the needle bar 4 and the needle 18 are moved as shown in FIG. 1 (right side) via the needle swing mechanism A along with the rotation of the vertical shaft 9 interlocked with the rotation of the main spindle 6 of the sewing machine. As shown in the state diagram of the dead center), the looper 5 swings in the left-right direction, and the looper 5 moves in the left-right direction via the looper swing mechanism B in conjunction with the swinging motion of the needle bar 4, By moving the needle 18 and the looper 5, the needle drops between the adjacent claws 2 and 2 of the needle plate 3 to form stitches on the claws 2, and for each needle drop through a feed dog (not shown). By feeding the fabric in the sewing progress direction X, double zigzag stitches are formed.

  According to the method of the present invention, a decorative sequin 36 is automatically supplied to a double chain stitch zigzag-like stitch or at regular intervals or irregular intervals so as to be sewn to the fabric. For this purpose, in the double chain stitch sewing machine having the above-described configuration, as shown in FIGS. 1 and 4, a sequin coupling body 37 in which a large number of sequins 36 are coupled to each other through the connecting portions 36 a is wound around the sewing machine body 1. In addition to mounting the supply reel 38, a sequin feed device 40 is mounted to sequentially feed the spangled connection body 37 fed out from the supply reel 38 toward the needle drop position by a predetermined pitch by driving the stepping motor 39. When the needle bar 4 is lowered, the spliced link 37 fed by the spangle feeding device 40 is cut at the connecting portion 36a by a cutting blade (not shown) so that the spangles 36 are supplied one by one to the needle drop position. . The sequin sending device 40 itself is the same as the well-known one used for an embroidery sewing machine described in, for example, Japanese Patent Application Laid-Open Nos. 2004-167097, 2005-46503, and 2005-87430. is there.

  Further, as shown in FIG. 1, a rotation detector 41 is attached to the end of the sewing pulley 22, and the rotation detector 41 allows an ON signal to flow at an arbitrary angle of one rotation of the sewing machine (0 to 360 ° rotation angle). On the other hand, as shown in FIGS. 1 and 2, a proximity sensor 42 is installed on the left end side of the looper shaft 28 to detect the left dead center of the looper shaft 28. Thus, as shown in FIG. 5 as an example of a timing chart for sending out sequins, the needle 18 is, for example, the first needle drop 1 among the six needle drop positions indicated by 1 to 6 in FIGS. When the bottom dead center is reached, the looper shaft 28 reaches the leftmost position. At this time, the proximity sensor 42 detects the left dead center of the looper shaft 28, which is used as the origin, and the number of times from the origin (see FIG. The stepping motor 39 is driven to send out the sequin 36 simultaneously with the ON operation of the rotation detector 41 (second time in the example of 5).

  As described above, when the double chain stitch sewing machine is started, the splint 36 is moved in synchronism with the needle bar vertical movement mechanism 33, the needle swinging mechanism A, the looper swinging mechanism B, and the like that operate in conjunction with the rotation of the sewing machine spindle 6. By sequentially feeding to the position, various sewing patterns of the sequins 36 are formed in the staggered stitches of double ring stitches as exemplified in FIGS. The decorative pattern can be easily sewn.

It is a front view of the double chain stitch sewing machine which implements the method of the present invention. FIG. 2 is a left side view of the double chain stitch sewing machine of FIG. 1. FIG. 2 is a right side view of the double chain stitch sewing machine of FIG. 1. It is detail drawing of the needle drop of the double chain stitch sewing machine of FIG. FIG. 2 is a timing chart for sending out sequins in the double chain stitch sewing machine of FIG. 1. FIG. (A)-(c) is a top view which shows three examples of the sewing pattern of sequins. It is a perspective view which shows the sewing apparatus of the sequin of the sewing machine of a prior art example. It is a principal part sectional drawing of the sequin sewing apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sewing machine body 4 Needle bar 5 Looper 6 Sewing machine main shaft 18 Needle 22 Sewing pulley 28 Looper shaft 33 Needle bar vertical motion mechanism 36 Spangle 39 Stepping motor 40 Sequin delivery device 41 Rotation detector 42 Proximity sensor

Claims (1)

A sewing machine main body, a needle bar up-and-down movement mechanism that reciprocates the needle bar up and down in conjunction with the rotation of the sewing machine main shaft, and a needle bar in the sewing progressing direction in conjunction with the rotation of the sewing machine main shaft. A needle swinging mechanism that translates in a horizontal direction perpendicular to the right side, and a looper swinging mechanism that moves the looper in the horizontal direction along with the looper axis in conjunction with the parallel movement of the needle bar in the horizontal direction. And in the double chain stitch sewing machine that can form seams on a plurality of nails of the needle plate as the looper moves in the left-right direction,
A sequin feeding device is attached to the sewing machine body to feed sequins one by one to the needle drop position by driving a stepping motor, and is turned on at an arbitrary angle of 360 ° per rotation of the sewing machine at the end of the sewing pulley fixed to the end of the sewing machine main shaft. Attach a rotation detector that sends a signal, install a proximity sensor on the left end side of the looper shaft,
When the needle attached to the lower end of the needle bar reaches the bottom dead center of the first needle drop, the looper shaft reaches the leftmost position, and at this time, the proximity sensor detects the left dead center of the looper shaft, A sequin sewing method in a double chain stitch sewing machine, characterized in that the origin is set to the origin, and the stepping motor is driven simultaneously with the turning-on operation of the rotation detector several times from the origin to send out sequins. .

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