TWI518222B - Cover stitch seam structure and cover stitch sewing machine - Google Patents

Description

Flat seam construction and sewing machine

The present invention relates to a novel flat seam construction and a lockstitch machine that forms the flat seam construction.

In the past, a flat seam joint structure (Patent Document 1) has been proposed, and a flat seam joint structure represented by the JIS F mark is composed of two to four rows of stitch stitches, a yarn splitter line, and an upper trim line. Constructing, and using the first and second two upper trimming lines, combining the first upper trimming line with all the stitching stitches from the first row to the third or fourth row, and combining the second upper trimming The line and the stitch line of the first line of the edge end and the stitch line stitch of the adjacent second line are combined, wherein the two to four stitches are formed by moving the two to four needles up and down. The yarn splitter thread is reciprocated under the needle plate in a direction orthogonal to the feed cloth, and passes through the yarn splitter of the wire loop when moving in the outward movement, and the yarn separator is wrapped with each needle thread In the knot combination, the upper thread is attached to the fabric by combining the stitches with the yarn feeders which are moved back and forth to the front side of the needle in the direction of the needle arrangement.

Forming the wire hooks for the first and second upper trim wires on the yarn splitter forming the flat seam disclosed in Patent Document 1, and capturing the first upper trim line with the wire hook portion for the first upper trim line The stitch stitch combination of all the rows of the second to fourth rows, on the other hand, the second upper trim line is captured by the hook of the second upper trim line and the stitch line of the first line of the edge is adjacent thereto The second line of stitch stitch combinations.

It is also known to have a flat seam construction in which the upper trim line is combined with the stitch stitches of the other stitches of the third or fourth stitch stitches except for the stitch stitches of the first row of the side ends.

According to the configuration disclosed in Patent Document 2, the lead wire penetrating the upper trimming wire is moved forward and backward between the predetermined upper needles, and the swing amount of the yarn splitter or the swinging range is shifted to make the upper trimming line not match the edge end. A combination of stitch stitches in a row.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese New Registration No. 3155710

[Patent Document 2] Japan Shigongzhao 60-41909

The use of the flat seams of the first and second upper trim lines can be obtained by using the decorative lines of different colors for the first and second upper trimming lines, thereby obtaining a decorative flat seam joint structure, but the second upper layer The fascia line partially overlaps with the first upper sash line, causing the first upper sash line and the second upper sash line to be mixed with each other at the overlapping portion to cause color unevenness.

It is an object of the present invention to provide a flat seam joint structure using the first and second upper trim lines without causing the above-mentioned problems caused by the overlap of the two upper trim lines, and the formation of the flat seam joint structure. Sewing machine.

The flat seam structure of the invention of claim 1 is characterized by the following elements: three or four rows of stitch stitches formed through the cloth; the yarn splitter line is under the cloth and each line The stitching combination of the needle thread; the stitch line of the first line is the stitch line of the first line at the edge of the stitch line of three or four lines above the cloth; the first upper line, the system and a stitch stitch combination of a second row adjacent to the stitch line of the first line; and a second upper trim line different from the first upper trim line, and a second row other than the stitch stitch of the first row The stitching stitches of the third line and the stitching stitches of the third row to the fourth row are all combined.

The invention of claim 2 is a flat sewing machine for forming a flat seam of three rows of stitch stitches in a flat seam of the invention of claim 1 of the patent application, the sewing machine having: three The upper needles are arranged in parallel in the direction orthogonal to the feed and move up and down in conjunction with the main shaft; the yarn splitter moves left and right in the direction of the upward direction of the needles in synchronization with the movement of the upper needles up and down. The elliptical motion formed by the movement of the cloth before and after the movement; and the yarn splitter is moved back and forth in front of each upper needle in conjunction with the main shaft, and captures and pulls the upper trim line to swing left and right while moving outward; the sewing machine The utility model is characterized in that: a wire piece is used for passing the first upper decorative wire; a wire needle is provided with a needle eye for the second upper decorative wire to pass; and an actuating mechanism is connected with the wire pin to make the needle eye of the wire needle from above The front side of the needle advances and retreats between the upper needles forming the first line and the second line of the needle thread stitches; the first line hook portion is disposed on the yarn splitter, and the first line hook portion is disposed on the yarn splitter Capture and pull the stitches from the first line to the wire while moving The first upper trim line; and the second line hook portion are disposed on the yarn splitter, and the second line hook portion captures and draws the stitch line from the second line to the wire when the yarn splitter moves outward. The second eye of the needle is decorated with a thread.

The invention of claim 3 is the invention of claim 2, wherein the actuating mechanism for advancing and retracting the wire needle is coupled to a rocker shaft that constitutes a mechanism for reciprocating the yarn splitter.

According to the invention of claim 1, the first upper thread is combined with the stitches of the first row and the second row, and the second upper thread is combined with the stitches of the first row. In the second and third rows, or in combination with the stitches of all the rows from the second row to the fourth row, the two upper lines are not overlapped and mixed, even if the two upper lines are colored decorative lines, different colors The first and second upper trim lines are differentiated in color and become decorative seams.

A flat seam joint of the invention of claim 1 can be obtained by applying the sewing machine of the second item of the patent scope. If the actuating mechanism of the wire pin is separately formed separately from the mechanism for reciprocating the yarn splitter, the wire pin can be operated at the optimal timing, but as in the invention of claim 3, if the wire needle is used The actuator is coupled to a swing arm shaft that constitutes a mechanism for reciprocating the yarn splitter, and a part of the configuration is shared, whereby the mechanism can be simplified.

[Formation for implementing the invention]

Hereinafter, a lockstitch machine according to an embodiment of the present invention will be described with reference to the drawings.

In Fig. 1, the main shaft 3 and the rocker shaft 4 are arranged side by side on the arm 2 of the sewing machine 1, and are respectively pivotally supported to be freely rotatable about a horizontal axis. Further, the rocker arm shaft 4 is coupled to the main shaft 3 by the link mechanism 5, and is reciprocally rotated within a range of a certain angle by the rotation of the main shaft 3 (hereinafter referred to as "swing").

A swing shaft 8 as a rocker shaft is rotatably supported on the front end of the vehicle head 7. The swing shaft 8 and the rocker shaft 4 are coupled by a link mechanism 13 which is coupled downwardly. a swing arm 9 at the shaft end of the rocker arm, a roller 11 rotatably mounted laterally on the cylindrical portion 9a of the lower end of the swing arm, and a crank diametrically inserted into the upper end of the swing shaft 8 in the roller 11 The pin 12 is constructed such that the swing of the rocker shaft 4 about the horizontal axis is transmitted to the swing shaft 8 via the link mechanism 13 so that the swing shaft 8 can swing about the vertical axis. The mechanism for swinging the pendulum shaft 8 may be any mechanism that swings the pendulum shaft 8 by the autonomous shaft 3, and may be any mechanism, and is not limited to the above mechanism.

A needle bar 14 that moves up and down in conjunction with the main shaft 3 and moves up and down on the head 7 is attached to the needle holder 15 fixed to the lower end of the needle bar protruding downward from the head 7, in order to match the timing of the yarn splitter 38 to be described later. As shown in the first and eighth to twelfth drawings, the needle tips of the three upper needles 16a, 16b, and 16c are formed to gradually increase from the left side of the drawing to the right and are arranged side by side in the direction orthogonal to the feed.

The swing arm 18 and 19 are vertically coupled to the swing shaft 8 projecting downward from the head 7, and in the second to seventh figures, the splitter arm 18 is disposed on the swing arm 18 below the swing arm 19 (not shown). 21 As shown in the second to twelfth drawings, the yarn splitter 21 includes a hook portion 22 for the first upper trim thread and a second upper trim thread closer to the tip end side of the yarn splitter than the hook portion 22. The wire hook portion 23 is formed to swing around the swing shaft 8 by the swing of the swing arm 18 such that the first and second wire hook portions 22 and 23 are on the front side of the upper needles 16a, 16b, 16c. Move back and forth along the left and right direction of the graph. That is, when the yarn splitter 21 reciprocates in the left-right direction on the front side of the upper needles 16a, 16b, 16c from the right dead point to the left dead point, the first line hook portion 22 is in the 5 and 10, the right side of the right needle 16a passes over the right needle 16a and moves back and forth between the position of the second needle 16b reaching the second needle 16c, and the second thread hook portion 23 is from the 5th and 10th. The oblique front side of the right needle 16a of the figure reciprocates in the left-right direction between the range of the second figure of the right needle 16a, the middle needle 16b, and the left needle 16c.

The swing arm 19 is coupled to the swing arm 28 coupled to the shaft 27 by a connecting rod 30, and the shaft 27 is rotatably supported by the bracket 25 supported by the front end 7 in parallel with the swing shaft 8. Thereby, the swing of the swing shaft 8 is transmitted to the swing arm 19, and the shaft 27 is swung by the link 30 and the swing arm 28. The mechanism for transmitting the swing of the swing shaft 8 to the shaft 27 may be replaced by any other transmission mechanism.

A lead piece 32 having a pinhole 33 and a stage 26 are attached to the shaft 27, and a vertical mounting portion in which the bent lead pin 34 is attached is inserted into the stage 26. It is formed that the lead piece 32 and the lead pin 34 are swung around the shaft 27 on the yarn splitter, and the needle eye 33 of the lead piece 32 is at the position of the fifth figure from the right oblique front of the right needle 16a. The range between the positions of the second figure on the right side of the right needle 16a is advanced and retracted, and the needle eye 35 at the front end of the wire needle 34 is in the position from the fifth figure in front of the right hand 16a and enters the right needle 16a and its adjacent The range between the positions of the second figure between the needles 16b is advanced and retracted. In Fig. 1, reference numeral 37 is a trim guide attached to the arm.

The eyelet 33 of the lead piece 32 and the eyelet 35 of the lead pin 34 are formed as a circular hole in the illustrated example, but may be an elongated long hole or a groove as shown in FIG. eye of a needle. Further, in the illustrated example, the needle eyes are formed to penetrate vertically, but may be formed to penetrate in the horizontal direction.

As described above, the lead piece 32 and the lead wire 34 are swung forward and backward in the front-rear direction, and the rocker arm shaft 4, the link mechanism 13, the swing shaft 8, the swing arm 19, the link 30, the swing arm 28, the shaft 27, and the table 26 or the like constitutes an actuating mechanism for advancing and retracting the lead piece 32 and the lead pin 34, but the reciprocating mechanism for swinging the yarn splitter 21 to the left and right, that is, the rocker arm shaft 4, the link mechanism 13, and the swing shaft 8 The mechanism of the swing arm 18 is a common portion from the rocker shaft 4 to the swing shaft 8, and the swing shaft 8 is used as a common swing shaft, and the lead piece 32 and the shaft 27 of the lead pin 34 are centered. Round-trip motion of the swing.

In the above embodiment, the mechanism for reciprocating the lead piece 32 and the lead pin 34 is the same as the above-described swing mechanism, but a mechanism for reciprocating linear motion can be employed, and the swing of the lead piece 32 and the lead pin 34 can be used. The mechanism is not limited to the swing mechanism of the above embodiment, and other known swing mechanisms can be employed. With regard to such a known swinging mechanism, for example, an actuating mechanism of the wire needle disclosed in the above Patent Document 1 can be used.

In the above embodiment, the lead piece 32 and the lead pin 34 are oscillated around the shaft 27, but the reciprocating motion can be performed by separate actuating mechanisms that act in conjunction with the main shaft. Thereby, the lead piece 32 and the lead pin 34 can be moved at an optimum timing and an optimum trajectory.

The needle plate 36 under the head is attached to a stand (not shown), and the yarn splitter 38 shown in Figs. 8 to 12 is disposed in the frame below the needle plate. The yarn splitter 38 is threaded through the yarn splitter 38. As is generally known, it moves left and right in the direction orthogonal to the feed in synchronization with the upward movement of the upper needles 16a, 16b, 16c. The elliptical motion formed by the movement of the needles 41a, 16b, and 41c and the yarn separator line 39 which will be described later are formed in cooperation with the upper needles 16a, 16b, and 16c.

The sewing machine is constructed as described above. When the flat seam is made on the fabric, first, the needle threads 41a, 41b, 41c are respectively passed through the respective needles 16a, 16b, 16c, and the first upper trimming line 43a is passed through the lead sheet. The pinhole 33 of 32 passes the second upper trimming line 43b through the eyelet 35 at the front end of the wire pin 34, and passes the yarn splitter wire 39 through the yarn splitter 38 to start sewing the cloth.

The second to twelfth drawings show the seam forming process in the middle of sewing. At this time, the upper needles 16a, 16b, 16c are raised on the cloth to be at the top dead center, and the yarn splitter 21 is on the upper needles 16a, 16b. And the first and second upper trim wires 43a and 43b are hooked on the first and second wire hook portions 22 and 23, and the upper trim wires 43a and 43b are pulled to be located near the left dead point. And, the lead piece 32 is advanced to extend from the stitch line of the first line formed by the right needle 16a of the upper needle so that the hook is worn by the first upper trim line 43a on the first line hook portion 22. The passing eye 33 is located near the forward end of the right needle 16a, and the wire needle 34 advances to extend from the second line of stitches formed by the middle needle 16b so that the hook rests on the second wire hook 23 The eyelet 35 through which the second upper trimming line 43b passes is located near the forward end between the right needle 16a and the middle needle 16b (Fig. 2).

When the upper needles 16a, 16b, 16c start to descend from this state, the yarn splitter 21 reaches the left dead point of the forward end, and the lead piece 32 and the wire needle 34 reach the forward end. When the upper needles 16a, 16b, 16c are further lowered, the yarn splitter 21 starts to retreat toward the right side from the left dead point, while the wire piece 32 and the wire needle 34 are turned toward the front side to start to retreat, and the left needle 16c is self-reliant. The needle thread trace of the second row formed by the needle 16b extends and descends to the hook between the second upper trim line 43b on the second thread hook portion 23 and the yarn splitter 21 (Fig. 8).

When the upper needles 16a, 16b, 16c are further lowered, in a state where the upper trimming lines 43a, 43b are hooked against the respective hook portions 22 and 23, the yarn splitter 21 continues to retreat toward the right side of the figure, while the lead piece 32 and The wire needle 34 continues to retreat to the front side, and the left needle 16c pierces the cloth w, and again, the middle needle 16b descends to the second upper thread that is hooked against the second wire hook portion 23 and reaches the eyelet 35 of the wire needle 34. Between the 43b and the yarn splitter 21, and extending from the stitching of the first row formed by the right needle 16a, and descending to the first upper trimming line 43a and the hook which are hooked on the first threaded hook portion 22 Between the yarns 21 (Fig. 3).

When the upper needles 16a, 16b, 16c are further lowered, the yarn splitter 21 is on the right side of the figure, and the lead piece 32 and the wire needle 34 further continue to retreat, the second upper decorative line 43b is in a state of being wound around the left needle 16c. The yarn splitter 21 is retracted and pulled out from the second thread hook portion 23 to be loosened, but is pulled by the wire needle 34 to be swung back and retracted to absorb the slack, and is attached to the left needle 16c. In the state, the middle needle 16b is taken out to the front side (Fig. 9).

On the other hand, the first upper trimming line 43a is retracted from the first thread hook portion 22 by the yarn splitter 21 in a state of being wound around the middle needle 16b, and is loosened by the wire tab 32. The front side is swung and retracted to be pulled to absorb slack. At the same time, the right needle 16a is lowered to wrap around the middle needle 16b to reach between the first upper trim line 43a of the eyelet 33 of the lead piece 32 and the yarn splitter 21 (Fig. 4).

When the upper needles 16a, 16b, 16c reach the bottom dead center, the yarn splitter 21 approaches the right dead point of the retreating end, and the wire needle 34 and the wire piece 32 also rotate toward the front side toward the rear end. The second upper trimming line 43b is hooked on the left needle 16c, and the wire pin 34 which is swung by traversing the upper portion of the yarn splitter 21 is retracted toward the front side, and is rided on the yarn splitter and is tensioned. On the other hand, the first upper trim line 43a is hooked on the middle needle 16b, and is pulled away by the lead piece 32 toward the front side in a state of being separated from the yarn splitter 21 (Fig. 10).

When the upper needles 16a, 16b, 16c rise from the top dead center, the yarn splitter 21 reaches the right dead point, and the wire needle 34 and the wire piece 32 reach the front side rearward end (Fig. 5). Thereby, the second upper trimming line 43b is further pulled toward the front side in a state of riding on the yarn splitter 21, and the first upper trimming line 43a is also formed from the first row formed by the right needle 16a. The needle thread stitch is pulled toward the front side (Fig. 11).

When the upper needles 16a, 16b, 16c are further raised, the yarn splitter 21 is advanced toward the left side of the upper needles 16a, 16b, 16c, and the wire needle 34 and the wire piece 32 are advanced from the backward end toward the needle side (6th) Figure). Then, on the way forward, the second upper trim line 43b riding on the yarn splitter 21 is hooked against the second line hook portion 23 while reaching the stitch line of the first line formed by the right needle 16a. The first upper trim line 43a of the eyelet 33 of the lead piece 32 is captured by the first line hook portion 22 of the yarn splitter 21 (Fig. 12). Then, the cloth w is fed out of the seam portion while the wire needle 34 and the wire piece 32 reach the forward end.

As described above, the sewn lines 43a and 43b are sewn.

In the above embodiment, the lead piece 32 is swayed in the front-rear direction and the first upper fascia 43a is pulled, but the amount of the first upper garnish 43a pulled out by the yarn splitter 21 is smaller than that of the second upper line 43a. The wire 43b has a small amount of drawing, and even if the wire piece 32 is fixed, there is no particular obstacle to the formation of the seam. However, in order to form a beautiful seam, as shown in the above embodiment, the wire piece 32 is used. It is more appropriate to swing in the front and rear direction.

As described above, the upper trimming line 43a is sewn into the stitching stitches of the first row and the second row formed by the right needle 16a and the middle needle 16b, and the upper trimming line 43b is sewn into the needle by the left needle 16c and the middle needle. In the stitches of the third row and the second row formed by 16b, the upper trimming line 43a and the upper trimming line 43b are divided into left and right sides of the seam without overlapping. Therefore, in the case where the different color line is used for the upper decorative line 43a and the upper decorative line 43b, the color can be distinguished from the left and right sides of the seam without causing color unevenness.

The formation of the seam by the needle threads 41a, 41b, 41c carried on the upper needles 16a, 16b, 16c and the yarn separator line 39 of the yarn splitter 38 can be carried out by a well-known method which is generally known. The seam formation itself is not a feature of the present invention, and thus detailed description is omitted.

Fig. 14 shows the joint seam structure of the upper trimming lines 43a, 43b sewn in the above manner.

Further, in the sewing machine, the yarn splitter 21 and the yarn splitter 38 are moved back and forth in the direction from the left to the right opposite to the sewing machine of the above-described embodiment, and the structure is formed to be bilaterally symmetrical with the sewing machine of the above-described embodiment. The shape of the sewing machine called the left sewing machine. The present invention is also applicable to a sewing machine for such a left sewing machine. Therefore, in the sewing machine of the left sewing machine, contrary to the sewing machine of the above embodiment, the stitch line of the first line is formed by the left needle. The second line of stitch stitches is formed by the middle stitch, and the third line of stitch stitches is formed by the right stitch.

1. . . Sewing machine

3. . . Spindle

4. . . Rocker shaft

8. . . Pendulum shaft

13. . . Linkage

14. . . Needle bar

16a, 16b, 16c. . . needle

18, 19. . . Swing arm

twenty one. . . Splitter

22, 23. . . Line hook

27. . . axis

32. . . Wire piece

34. . . Wire pin

38. . . Splitter

43a, 43b. . . Upper trim

Fig. 1 is a perspective view of the main part of the lockst sewing machine of the present invention.

Fig. 2 is a plan view showing a forming process of the upper thread stitching by means of the yarn splitter, the wire needle and the wire piece.

Figure 3 is a top view showing the next formation process.

Figure 4 is a plan view showing the next formation process.

Figure 5 is a plan view showing the next formation process.

Figure 6 is a plan view showing the next formation process.

Figure 7 is a plan view showing the next formation process.

Figure 8 is a perspective view showing a forming process of the flat seam formed by the needle, the yarn splitter, the yarn splitter, the wire needle and the wire piece.

Figure 9 is a perspective view showing the next formation process.

Figure 10 is a perspective view showing the next formation process.

Figure 11 is a perspective view showing the next formation process.

Figure 12 is a perspective view showing the next formation process.

Figure 13 is a schematic diagram showing other aspects of the needle eye.

Figure 14 is a perspective view of the flat seam joint structure of the present invention.

16a, 16b, 16c. . . needle

twenty one. . . Splitter

22, 23. . . Line hook

32. . . Wire piece

34. . . Wire pin

38. . . Splitter

43a, 43b. . . Upper trim

Claims (3)

A flat seam joint structure characterized by the following elements: three or four rows of stitch stitches formed through the cloth; the yarn splitter line is entangled with the stitches of each row under the cloth; The first line of stitch stitches is the stitch line of the first line at the edge of the three or four stitch stitches on the cloth; the first upper line is the stitch line with the first line a stitching stitch combination of the second row of the adjacent; and a second upper trimming line different from the first upper trimming line, and a stitching stitch and a third row of the second row except the stitching stitches of the first row The stitches of the stitches or all of the stitches of the stitches from the second to fourth rows are all combined. A sewing machine comprising: three upper needles arranged in parallel in a direction orthogonal to the feed cloth and moving up and down in conjunction with the main shaft; the yarn splitter is moved upwards in synchronization with the movement of the upper needle The left and right movement of the arrangement direction and the elliptical motion formed by the movement before and after the feeding direction; and the yarn splitter is moved back and forth in front of each upper needle in conjunction with the main shaft, and captures and pulls the upper decorative line during the outward movement. And the left and right swinging; the sewing machine is characterized by: a wire piece for passing the first upper decorative thread; the wire needle is provided with a needle eye for the second upper decorative wire to pass; and an actuating mechanism is coupled with the wire pin , the needle eye of the wire needle is advanced and retracted from the front side of the upper needle toward the upper needle forming the first line and the second line of the needle thread stitch; the first line hook portion is disposed on the yarn splitter, the first line The hook portion captures and draws the stitch line from the first row to the first upper trim line of the lead piece when the yarn splitter moves outward; and the second line hook portion is disposed on the yarn splitter, the first two The wire hook catches and pulls the stitch line from the second line to the second upper thread of the eye of the wire needle when the yarn splitter moves outward. The sewing machine of claim 2, wherein the actuating mechanism for causing the wire needle to advance and retract is coupled to a rocker shaft that constitutes a mechanism for reciprocating the yarn splitter.