TWI703250B - Sewing machine, sewing device, and sewing method - Google Patents

Abstract

The sewing machine (10) of the present invention is provided with a support plate (19), a sewing machine presser foot (18), a sewing machine needle (15), a feed tooth (22) under the sewing object (50) intermittently conveying, and The sewing material (50) rotates while in contact with the sewing material (50) to guide the sewing material (50) into the guide roller (31, 38, 39) between the support plate (19) and the sewing machine presser foot (18), and the guide roller (31, 38, 39) The roller drive unit (33) that is continuously driven to rotate. In addition, the guide rollers (31, 38, 39) are arranged at least on the upstream side of the sewing machine needle (15) in the feed direction of the sewing product (50) by the lower feed teeth (22). According to the sewing machine (10) of the present invention, it is possible to automatically and stably hem the object to be sewn (50) provided with the arc-shaped side edges (55b).

Description

Sewing machine, sewing device, and sewing method

The present invention relates to a sewing machine for sewing an object to be sewn (sewing object), a sewing device having the sewing machine, and a sewing method using the sewing machine, and more particularly to a curved portion having an arc shape at least in part The sewing machine, sewing device (overlocking device), and sewing method for the hemming of the crotch opening.

In the sewing machine, as a cloth feeding mechanism for conveying the sewn, in addition to the general cloth feeding mechanism that only uses the lower feeding teeth to intermittently convey the sewn, it is also known, for example, to maintain the needle of the sewing machine to penetrate the sewn. The cloth feeding mechanism that uses the lower feeding teeth and the sewing machine needle to intermittently convey the sewn under the state, or the lower feeding teeth and the upper feeding teeth sandwich the sewing object from top to bottom and intermittently convey the cloth feeding mechanism Wait. In addition, in Japanese Patent Laid-Open No. 7-116370 (Patent Document 1), as a blind stitch feeding device, a cloth feeding mechanism is described as having a pair of left and right upper feeding belts arranged on both sides of the fabric pressing , And a pair of left and right lower feeding belts arranged opposite to the upper feeding belt. The cloth feeding mechanism of Patent Document 1 is formed to be capable of intermittently conveying the cloth along the cloth conveying direction by sandwiching the cloth from the above-mentioned pair of upper cloth feeding belts and the pair of lower cloth feeding belts. Offset in the direction orthogonal to the feeding direction. Furthermore, for example, in Japanese Patent Laid-Open No. 2014-46059 (Patent Document 2), as a cloth feeding mechanism of a sewing machine that sews a cylindrical object to be sewn, the following cloth feeding mechanism is described, that is, having a cloth abutting from below The first feeding tooth (left feeding tooth) and the second feeding tooth (right feeding tooth), and the intermittent feeding roller which is arranged on the side (right side) of the sewing machine needle and abuts the fabric from below. According to Patent Document 2, it is possible to separately adjust the amount of cloth fed intermittently by the first feeding tooth (left feeding tooth) and the amount of intermittent feeding by the second feeding tooth (right feeding tooth) and the intermittent feeding roller. The feeding amount can be adjusted, so it is possible to sew a cylindrical part beautifully. As mentioned above, the cloth feeding mechanism in which the article to be sewn is intermittently conveyed by the upper and lower cloth feeding teeth, the cloth feeding mechanism of Patent Document 1 having a pair of upper cloth feeding belts and a pair of lower cloth feeding belts, and The first and second feeding teeth at the bottom and the intermittent feeding roller at the top of the patent document 2 of the feeding mechanism are sewn from the top and bottom at the same time by clamping members such as the feeding teeth, belts, and rollers. In the state of the article, the article to be sewn is conveyed together with the clamping member, so the article to be sewn can be conveyed stably. However, these cloth feeding mechanisms not only require the upper and lower clamping members, but also the upper and lower clamping members must be simultaneously conveyed or intermittently operated with a specific feeding amount. Therefore, the structure and control of the cloth feeding mechanism has the disadvantage of being very complicated compared to a general cloth feeding mechanism having only the lower feeding teeth, for example. In addition, in the cut clothing materials such as jeans, pants, skirts and shirts, in order to prevent the cut edges from blooming and improve the strength or appearance of the cut side edges, it is known that the cut side edges Carry out hemming stitching. In addition, sometimes this kind of hemming is called "seam". In addition, as one of the components of the clothes to be sewn, there is a front crotch opening (also sometimes referred to simply as "front crotch opening") such as jeans. In the front crotch opening portion, generally corresponding to the shape of jeans or the like, an arc-shaped curved portion is provided on a part of its side edge portion, and a zipper or button is attached. When using a sewing machine to stitch a sewn product such as the front crotch opening, continuously follow the cut side edge of the sewn product (for example, the arc-shaped side edge in the front crotch opening) Carry out hemming stitching. In normal hemming, the sewing machine is operated to hemming the side edge of the sewn, and the shape of the part to be sewn is adjusted by manual operation. Location or direction. On the other hand, for example, Japanese Patent Laid-open No. 2007--14556 (Patent Document 3) or International Publication No. 2012/032615 (Patent Document 4) discloses the following sewing device (locking device), which can be used all at once The cloth feeding mechanism of the sewing machine automatically transports the front crotch opening with a specific shape, while sewing the hemming, and makes the front crotch opening automatically rotate in a fixed motion during the sewing. According to the sewing device (locking device) described in Patent Document 3 and Patent Document 4, even if a part of the side edge portion of the front crotch opening is formed in an arc shape, the front crotch is opened manually or automatically Part of it is placed in a specific position of the device, so that the front crotch opening is automatically fed by the cloth feeding mechanism of the sewing machine, and the front crotch opening is automatically rotated by a member different from the cloth feeding mechanism without consuming manpower. Therefore, without manual adjustment of the position or direction of the sewn article, the side edge of the crotch opening portion before the curved portion with the arc shape can be automatically sewn along the side edge. In this way, in the devices of Patent Document 3 and Patent Document 4, the hemming of the front crotch opening portion can be automated and efficiently performed, and therefore, the burden on the operator can be reduced. In addition, since it is possible to repeatedly hem and sew a plurality of front crotch openings in the same manner, it is possible to stabilize the quality compared to the case where the direction of the sewn product is adjusted by manual operations, for example. [Prior Art Document] [Patent Document] Patent Document 1: Japanese Patent Laid-Open No. 7-116370 Patent Document 2: Japanese Patent Laid-Open No. 2014-46059 Patent Document 3: Japanese Patent Laid-Open No. 2007-14556 Patent Document 4: International Publication No. 2012/032615

However, when the front crotch opening is conveyed using a general cloth feeding mechanism using, for example, lower feeding teeth, the front crotch opening is opened during sewing of the front crotch opening as described in Patent Document 3 and Patent Document 4. When part of the seam is automatically rotated by a fixed motion, the front crotch opening is easily sandwiched between the needle plate and the presser foot of the sewing machine, and the hemming cannot be sewn. To explain in detail, usually, the fabric forming the front crotch opening is not homogeneous in most cases. Therefore, there are cases where slight differences in properties such as hardness or thickness in the fabric are partially caused, and there are also unique fabrics. The texture of the situation. Therefore, when the lower feed teeth are used to transport the front crotch opening formed by this kind of cloth, if only the front crotch opening is combined with the transport of the lower feed teeth to move mechanically in a fixed motion, it cannot be made by manual operation. The movement of the front crotch opening is generally adjusted according to the nature of the fabric. As a result, there may be local gatherings or wrinkles in the fabric of the front crotch opening due to the slight difference in the nature of the fabric parts or the unique texture of the fabric. There are such gatherings or wrinkles in the sewing machine. It is stuck in the front end of the sewing machine presser foot during sewing. In addition, the gathering or wrinkles of this kind of fabric tend to occur when the arc-shaped curved portion of the front crotch opening portion is hemmed and sewn into the curved hemming. Furthermore, for example, when the crotch opening part is hemmed before the zipper is attached, there is a case where the hemming is performed so as to cross the zipper chain cloth of the zipper. However, the zipper chain fabric is usually sewn to the fabric in a state where it overlaps the fabric of the front crotch opening portion, so a step difference is formed between the fabric of the front crotch opening portion and the zipper chain fabric. In addition, when a core cord part bulging in the thickness direction of the chain cloth is provided on the side edge of the zipper chain cloth, the step difference between the cloth of the front crotch opening and the zipper chain cloth is larger. If one side is automatically fed so that the side of the crotch opening is sewn before the step difference is formed between the zipper chain cloth, the step difference may be stuck in the sewing machine presser foot, or the sewing machine presser foot cannot cross the step difference. Failure to continue the hemming. In addition, the zipper chain fabric of a zipper has to fix and hold the zipper elements in a specific position in a specific posture, so for example, it is formed by increasing rigidity compared with the fabric of jeans. On the other hand, in recent years, the diversification of clothes has been developing, and jeans of thin and soft fabrics are also sold. However, when the zipper is installed on a thin and soft fabric as described above to form the front crotch opening, and the bottom feed teeth are used to intermittently transport the side while sewing, the difference between the zipper chain fabric and the fabric Due to the difference in rigidity, if only the lower feed teeth are used, it may not be possible to convey both the zipper chain cloth and the fabric properly. As a result, there are also cases where products with insufficient hemming are manufactured as defective products. . Furthermore, for example, as a cloth feeding mechanism of a sewing machine, in order to smoothly convey the front crotch opening, it is also conceivable to use the following mechanism as in Patent Document 1 or Patent Document 2 mentioned above: Both the front side and the bottom side are intermittently transported while sandwiching the front crotch opening. However, since the structure and control of such a cloth feeding mechanism are very complicated as described above, the manufacturing cost of the front crotch opening is increased. The present invention has been accomplished in view of the foregoing problems, and its object is to provide a sewing machine, a sewing device having the sewing machine, and a sewing method using the sewing machine, which can prevent the crotch opening with a zipper from being sewn. The article is stuck in the presser foot of the sewing machine, so that while the cloth feeding mechanism using the lower feeding tooth smoothly conveys the article to be sewn, the article is sewn by the sewing method such as hemming.

In order to achieve the above-mentioned object, the sewing machine provided by the present invention is a sewing machine that includes a support plate on which the article to be sewn is placed, a sewing machine presser foot that presses the article to be sewn toward the support plate, a sewing machine needle that moves up and down relative to the support plate, And contacting the sewing object from the lower surface side and intermittently conveying the lower feeding teeth of the sewing object. The most important feature of the above-mentioned sewing machine is that it is provided with the function of rotating while in contact with the sewing object. The article to be sewn is introduced into the guide roller between the support plate and the presser foot of the sewing machine, and the roller driving portion that continuously drives the guide roller to rotate, and the guide roller is used for the lower feed tooth of the article to be sewn. The cloth feeding direction is arranged at least on the upstream side than the position of the sewing machine needle. In such a sewing machine of the present invention, it is preferable that the introduction roller is in contact with the sewing object at a position more upstream than the position where the pressing surface of the sewing machine presser foot contacts the sewing object. In addition, in the sewing machine of the present invention, it is preferable that a drive control section that controls the drive of the roller drive section is arranged, and the drive control section makes the rotation speed of the lead-in roller and the lower feeding tooth used The cloth feed speed of the sewn object is controlled correspondingly, and the operation and stop of the roller drive unit are controlled corresponding to the sewing position of the sewn object. Furthermore, in the sewing machine of the present invention, it is preferable to arrange a roller moving part which moves the introduction roller to a contact position where the introduction roller contacts the sewing object, and the introduction roller is away from the sewing object And the roller moving part corresponds to the sewing position of the sewn object to move the introduction roller to the contact position or the remote position and hold it.

In the sewing machine of the present invention, it is preferable that the guide roller has a cylindrical shape with a fixed size in the radial direction from the shaft center of the guide roller to the outer periphery, and at least a part is provided from the shaft center of the guide roller to the outer periphery The size of the edge in the radial direction decreases toward one side of the axial direction. A conical shape or a spherical shape of a tapered portion.

Furthermore, it is preferable that the sewing machine of the present invention performs hemming stitching on the above-mentioned sewing object.

Furthermore, in the sewing machine of the present invention, it is preferable that a cutter section for cutting the article to be sewn is arranged, and the cutter section is arranged on the introduction roller in the cloth feeding direction by the lower feeding teeth. It is between the position of the above-mentioned object to be sewn and the position of the above-mentioned sewing machine needle.

In addition, according to the present invention, there is provided a sewing device having: a sewing machine having the above-mentioned structure; and an automatic conveying section, which can be accompanied by the use of the lower feed tooth when sewing the object to be sewn by the sewing machine The conveying of the sewing object causes the sewing object to automatically rotate in a fixed motion.

Next, the sewing method provided by the present invention uses a sewing machine to sew the above-mentioned article to be sewn. The sewing machine includes a support plate on which the article to be sewn is placed, and a sewing machine presser foot that presses the article to be sewn toward the support plate. The sewing machine needle that moves up and down on the support plate and the feed teeth that contact the sewing object from the lower surface side and transport the sewing object intermittently. The main feature of the sewing method is that it includes the following steps: using the sewing machine, The sewing machine further includes an introduction roller that guides the article to be sewn between the support plate and the presser foot of the sewing machine, and a roller drive unit that continuously drives the introduction roller to rotate; and sews at least a part of the article to be sewn. At this time, the introduction roller is brought into contact with the article to be sewn, and the introduction roller is continuously rotated by the roller drive unit, thereby introducing the article to be sewn between the support plate and the sewing machine presser foot. The sewing method of the present invention preferably includes synchronizing the feeding speed of the article to be sewn by the lower feeding teeth and the introduction speed of the article to be sewn by the introduction roller. In addition, the sewing method of the present invention preferably includes the following steps: using the crotch opening before the zipper is installed as the article to be sewn; using the sewing machine to overwhelm the front crotch opening; When the at least arc-shaped curved portion of the opening is sewn together, the introduction roller is brought into contact with the front crotch opening, and the introduction roller is continuously rotated by the roller drive. Furthermore, the sewing method of the present invention preferably includes the step of using the roller drive unit to perform the hemming of the straight side edges continuously formed from the curved portion on the front crotch opening. The driving of the roller is stopped, or the introduction roller is moved away from the front crotch opening.

The sewing machine of the present invention is provided with a support plate such as a needle plate, a sewing machine presser foot that is pressed against the object to be sewn (sewing object), a sewing machine needle, and a feed tooth under the object to be transported intermittently, by contacting the object to be sewn In this state, it rotates to guide the sewn product into the guide roller between the support plate and the sewing machine presser foot, and the roller drive unit that continuously drives the guide roller to rotate. In addition, the guide roller is arranged on the upstream side of the sewing machine needle in the feed direction of the sewing material by the lower feed tooth. According to such a sewing machine of the present invention, even if a local gathering or wrinkle occurs in the fabric of the sewn article along with the conveying of the sewing material such as the front crotch opening by the lower feed teeth, the gathered or wrinkled part can be introduced Before reaching between the support plate (needle plate) and the presser foot of the sewing machine, the continuously rotating lead-in roller contacts the part to correct aggregation or wrinkles, thereby returning the fabric to its normal (normal) state. Furthermore, by contacting the rotating lead-in roller with the sewing material, the contacted part can be continuously and forcibly fed between the support plate and the sewing machine presser foot. Therefore, it is difficult to cause the sewing material to get stuck in the sewing machine during sewing. The condition of the presser foot or support board. Also, for example, when sewing the crotch opening before attaching the zipper to the fabric, even if a step is formed between the fabric of the front crotch opening and the zipper chain cloth (especially the core rope portion of the zipper chain cloth) of the zipper It is also possible to use the continuously rotating lead-in roller to force not only the cloth or zipper chain cloth, but also the level difference between the two, to between the support plate and the sewing machine presser foot. Thereby, the sewing machine presser foot can smoothly pass the step difference of the front crotch opening part, and therefore, it is not easy to cause the step difference to be stuck on the sewing machine presser foot or the support plate. Furthermore, the cloth and zipper chain are guided between the support plate and the presser foot of the sewing machine by the continuously rotating guide roller, which can assist the conveying of the previous crotch opening by the lower feed teeth. Therefore, for example, even for cloth and zipper The difference in rigidity of the chain cloth can also be carried out while sewing both the cloth and the zipper chain cloth appropriately. Therefore, according to the sewing machine of the present invention, even if a complicated structure or control is not adopted for the cloth feeding mechanism, it is possible to use the lower cloth feeding teeth to smoothly convey the sewn material such as the front crotch opening with a zipper while sewing it up by overhemming. The iso-stitching method sews the object smoothly and stably. Furthermore, in the sewing machine of the present invention, it is possible to sew the object to be sewn except for the front crotch opening, and it is also possible to sew the object to be sewn by sewing methods other than hemming. In the sewing machine of the present invention, the guide roller is located in the feeding direction of the lower feeding tooth so as to meet the position of the sewing machine with the pressing surface of the sewing machine presser foot, preferably upstream of the sewing machine presser foot The position of the side edge is arranged so that the position on the upstream side is in contact with the sewing object. Thereby, by bringing the introduction roller into contact with the article to be sewn, and rotating the introduction roller by the roller drive unit, the article to be sewn can be stably fed between the support plate and the presser foot of the sewing machine. In addition, in the sewing machine of the present invention, a drive control unit that controls the drive of the roller drive unit is arranged. The drive control unit can make the rotation speed of the lead-in roller correspond to the feed speed of the article to be sewn by the lower feeding teeth, so that the lead-in speed of the article to be sewn using the lead-in roller and the article to be sewn by the lower feeding teeth The feeding speed is controlled in a synchronized manner. Thereby, the feed roller can be used to stably and effectively assist the conveying of the sewn by the lower feeding teeth. In addition, it is possible to prevent the sewing material from being excessively fed under the presser foot of the sewing machine by the introduction roller, or the sewing material is caught in the introduction roller or partially elongated due to insufficient rotation of the introduction roller. Circumstances, so as to smoothly sew. Furthermore, the drive control unit of the present invention can control the operation and stop of the roller drive unit corresponding to the sewing position of the sewn article. With this, for example, when sewing a sewn with a straight side edge portion and an arc-shaped side edge portion (curve portion), it is possible to wrap the arc-shaped side edge portion. When the side seam is being sewn, the introduction roller is rotated to positively feed the sewn under the sewing machine's presser foot. On the other hand, when the straight side edge part (straight part) is hemmed, the operation of the roller driving part can be stopped to make the introduction roller free. Thereby, it is possible to temporarily interrupt the feeding operation of the sewn article by the guide roller, and sew the linear side edge only by the conveyance of the sewn article by the lower feed tooth. As a result, It is possible to sew the object to be sewn efficiently, and it is possible to suppress the occurrence of defects due to the feeding of the guide roller when sewing at a relatively fast speed. Furthermore, in the sewing machine of this invention, the roller moving part which moves the lead-in roller to the contact position where the lead-in roller comes into contact with the object to be sewn, and the distance away position where the lead-in roller is away from the object to be sewn is arranged. The roller moving part can move the guide roller to the contact position or the distant position and hold it corresponding to the sewing position of the sewn object. Thereby, even if the introduction roller is continuously rotated by the roller drive unit, it is possible to temporarily stop the introduction roller by keeping the introduction roller away from the side edge part (straight part) when hemming and sewing. The feeding action of the sewn material by the guide roller. Thereby, it is possible to sew the object to be sewn efficiently, and it is possible to suppress the occurrence of defects due to the feeding of the guide roller when sewing at a relatively fast speed.

The introduction roller of the present invention has a cylindrical shape with a fixed size in the radial direction from the shaft center of the introduction roller to the outer periphery. Thereby, the rotating lead-in roller can be stably brought into contact with the article to be sewn, and the article to be sewn can be smoothly fed under the presser foot of the sewing machine. In addition, the introduction roller of the present invention may have a conical shape or a spherical shape in which at least a part of the introduction roller has a tapered portion whose size in the radial direction from the shaft center to the outer periphery of the introduction roller decreases toward one side of the axial direction. For example, in the case of hemming the arc-shaped side edges of the object to be sewn, the object to be sewn is rotated while sewing. In this case, by forming the introduction roller into a conical shape or a spherical shape, it is possible to prevent the introduction roller from getting caught in the sewing object when the sewing object is rotated. Therefore, the rotating introduction roller can be brought into contact with the sewing object. On one side, the sewing object is smoothly rotated on the support plate.

The sewing machine of the present invention as described above is particularly suitable for the case where the sewn objects are hemmed together.

Furthermore, in the sewing machine of this invention, the cutter part which cuts a sewing object is arrange|positioned. The cutter part is arranged between the position where the guide roller contacts the sewing object and the position of the sewing machine needle in the cloth feeding direction using the lower feeding teeth. In this type of sewing machine, by supplying the sewn under the guide roller, the sewn product can be cut into a specific shape by the cutter part, and the sewing product can be cut by the cutter part. The formed side edges are sewn together. Therefore, it is possible to efficiently hem the specific position of the sewn.

In addition, according to the present invention, there is provided a sewing device having: a sewing machine having the above-mentioned structure; and an automatic conveying section that can be sewn with the lower feed teeth when the sewing machine is used to sew the object The conveying of the object causes the object to be sewn to automatically rotate in a fixed motion on the same plane as the upper surface of the support plate. Here, the term "automatic" means that the work is performed automatically by a machine regardless of manpower. According to the sewing device of the present invention, by placing the sewing object such as the front crotch opening at a specific position, for example, the direction of the sewing object is not adjusted by the operator by manual operation, and the sewing object It does not get stuck in the presser foot of the sewing machine, and it can automatically and stably sew the object to be sewn by sewing methods such as hemming. Therefore, it is possible to further reduce the manufacturing cost or to further stabilize the quality of the product. Secondly, in the sewing method provided by the present invention, a sewing machine is used to sew the article to be sewn. The sewing machine is equipped with a support plate, a sewing machine presser foot that presses against the article to be sewn, a sewing machine needle, and intermittently conveys the article to be sewn. The teeth, by rotating in the state of being in contact with the sewn, guide the sewn into the guide roller between the support plate and the sewing machine presser foot, and a roller drive unit that continuously drives the guide roller to rotate. In addition, when sewing at least a part of the sewing product, the introduction roller is brought into contact with the sewing product, and the introduction roller is continuously rotated by the roller drive unit, thereby introducing the sewing product between the support plate and the sewing machine presser foot . By this, for example, even if a local gathering or wrinkle occurs in the fabric of the sewn, the continuously rotating guide roller can contact the part to correct the gathering or wrinkle, and the contacted part can be continuously and forcibly fed to the support Between the plate and the presser foot of the sewing machine, it is not easy to cause the sewn product to get stuck on the presser foot or support plate of the sewing machine during sewing. Also, for example, when sewing the crotch opening part before installing the zipper on the fabric, it is not easy to produce a step difference between the fabric formed in the front crotch opening part and the zipper chain cloth of the zipper stuck in the sewing machine foot or support Board situation. and then. The cloth and zipper chain are guided between the support plate and the presser foot of the sewing machine by the continuously rotating guide roller, which can assist the conveying of the front crotch opening by the lower feed teeth, so that the cloth and zipper chain can be conveyed appropriately. Sewing on both sides of the cloth. Therefore, according to the sewing method of the present invention, even if a complicated structure or control is not used for the cloth feeding mechanism, it is possible to use the lower cloth feeding teeth to smoothly convey the sewn material such as the front crotch opening with the zipper, and to use the hemming This sewing method is used to sew the object smoothly and stably. In the sewing method of the present invention, the feeding speed of the article to be sewn by the lower feeding teeth is synchronized with the introduction speed of the article to be sewn by the introduction roller. Thereby, the feed roller can be used to stably and effectively assist the conveying of the sewn by the lower feeding teeth. In addition, it is possible to prevent the sewing material from being excessively fed under the presser foot of the sewing machine by the introduction roller, or the sewing material is caught in the introduction roller or partially elongated due to insufficient rotation of the introduction roller. Circumstances, so as to smoothly sew. In addition, the sewing method of the present invention is particularly suitable when the crotch opening before the zipper is attached is used as the object to be sewn to wrap the front crotch opening. Furthermore, when an arc-shaped curved portion is formed on the side edge of the front crotch opening, if the hemming is sewn by the previous sewing method, only the lower feed tooth is used to transport the curved portion. The front crotch opening is gathered or wrinkled, and the front crotch opening is likely to be caught in the presser foot of the sewing machine. However, in the sewing method of the present invention, when the curvilinear part of the front crotch opening is hemmed, the guide roller and the front crotch The openings are in contact with each other, and the introduction roller is continuously rotated by the roller drive, so that the front crotch opening is not easily caught in the sewing machine presser foot. Therefore, the side edge of the front crotch opening can be smoothly and stably sewn. Close up. Furthermore, in the sewing method of the present invention, when hemming the straight side edges continuously formed from the curved portion in the front crotch opening portion, the driving of the guide roller by the roller driving unit is stopped or the guide The roller is away from the front crotch opening. With this, it is possible to temporarily interrupt the feeding operation of the sewn product by the introduction roller when hemming the straight side edge (straight portion) provided on the sewn product, etc. Efficiently sew the object to be sewn. In addition, it is possible to suppress the occurrence of malpractice due to the feeding of the guide roller when sewing at a relatively fast speed.

Hereinafter, the embodiments of the present invention will be described in detail while enumerating embodiments and referring to the drawings. In addition, the present invention is not limited to the embodiments described below, and various changes can be made as long as it has substantially the same configuration as the present invention and has the same effects. [Embodiment] Fig. 1 is a front view showing the sewing device of this embodiment. Figures 2 and 3 show a perspective view and a side view of the sewing machine of the sewing device. Figures 4 and 5 are cross-sectional views of the structure around the sewing machine needle of the sewing machine viewed from the left and right sides. Furthermore, in the following description, the front-rear direction is the direction in which the sewing machine is conveyed by the lower feed teeth, and the direction of conveying the sewn (the direction on the back side in Fig. 1) is set to the rear, and the reverse The direction (the direction of the front side in FIG. 1) is set to the front. The vertical direction is the direction orthogonal to the flat placement surface of the support plate, and the direction of the side where the sewing machine needle is arranged relative to the support plate (the upper direction in Figure 1) is set to the upward direction, and the lower position is relative to the support plate. The direction of the side of the feed tooth (the lower direction in Figure 1) is set to the downward direction. The left and right direction is the direction orthogonal to the cloth feeding direction of the sewn and parallel to the placement surface of the support plate. In the case of this embodiment, the left side and the right side when the sewing machine is viewed from the front side as shown in FIG. 1 are set to the left and right directions, respectively. The sewing device 1 (also called the overlocking device) of this embodiment, as shown in Figures 1 and 2, has a sewing machine (overlocking machine) 10 for overlocking the sewing object (sewing object), and a sewing machine 10 The connected table (work table) 3, and the automatic conveying part that can press the sewing object placed on the specific position on the table 3 from above and make the sewing object move and rotate according to the preset activity 5. In this case, the upper surface of the platen 3 is formed flat. In such a way that the upper surface of the table 3 and the mounting surface of the following support plate (needle plate) 19 of the sewing machine 10 form the same plane, the table 3 is connected to the base 11 of the sewing machine 10 and is connected by an unillustrated The support department supports the platen 3. Furthermore, in the present invention, the table (work table) of the sewing device can also be integrally formed with the support plate of the sewing machine (in other words, a part of the table (work table) of the sewing device can also be used as the support plate of the sewing machine ).

The automatic conveying unit 5 of this embodiment has an automatic arm (robotic arm) 5a shown in FIG. 1, an arm drive mechanism (not shown) that moves the automatic arm portion 5a, and a control unit (not shown) that controls the arm drive mechanism (computer). In addition, the automatic conveying part 5 of this embodiment is preset (programmed) by automatically performing various actions such as the following actions as follows: the automatic arm 5a presses the sewn object on the table 3 from the top ( The front crotch opening part (fly-parts) 50) is moved from a specific position to the sewing start position by a fixed motion; after starting to sew with the sewing machine 10, the automatic arm 5a presses the sewing object against the sewing machine The cloth feeding speed of 10 makes it move accordingly; while the automatic arm 5a presses the sewing object in sewing, and rotates it at a specific point in time; and after the sewing by the sewing machine 10 is finished, use the automatic arm 5a The sewn product is transported to the collection part not shown. That is, the automatic conveying part 5 of this embodiment is provided with an automatic moving part capable of automatically moving the sewing object (front crotch opening 50) in a fixed path, and capable of automatically rotating the sewing object in a fixed motion at a fixed point in time The automatic handling department.

Furthermore, the automatic conveying part 5 of the present invention may be formed in a manner that at least automatically rotates the object to be sewn during sewing at a specific time point, and the specific structure of the automatic conveying part 5 is not particularly limited. For example, as the automatic conveying unit 5 of the present invention, a part of the sewing device described in Patent Document 3 or a part of the sewing device described in Patent Document 4 may be used.

The sewing machine 10 of this embodiment has a base portion 11 as a base, a leg portion 12 erected upward from the right side end of the base portion 11, and a leg portion from the upper end of the leg portion 12 to the left and the base The arm portion 13 extends substantially parallel to the portion 11.

The front end (left end) of the arm 13 in the sewing machine 10 protrudes backward obliquely downward, and a needle holder 16 with two sewing machine needles 15 and a pressing rod 17 are arranged. In this case, the needle holder 16 can be supported by a needle holder driving mechanism (not shown) to move up and down along the protruding direction of the needle holder 16 (rear obliquely downward). Furthermore, the sewing machine needle 15, the needle holder 16, and the needle holder driving mechanism of the present embodiment are formed in substantially the same manner as the previous general sewing machine that performs hemming. A sewing machine presser foot 18 is attached to the pressing rod 17. The sewing machine presser foot 18 can be held at the pressing position for pressing the sewing object (front crotch opening portion 50), and ascending and installing away from the ascending position (distance position) of the sewing object. In addition, the sewing machine presser foot 18 has: a presser body 18a, which presses against the object to be sewn, and a presser foot tip end 18b, which is arranged on the rear side of the presser body 18a (upstream in the feed direction of the sewing object) Side), and bend upward so as to easily introduce the sewn under the pressing body 18a. Therefore, the pressing surface pressed by the sewing machine presser foot 18 against the object to be sewn is basically formed by the lower surface of the presser body 18a. The front end portion 18b of the presser foot is provided with a notch-shaped accommodating recess into which a part of the introduction roller 31 described below is inserted and accommodated. At the left end of the machine base 11 in the sewing machine 10, a support plate (needle plate) 19 on which the sewing object is placed, and a plate fixing part 21 for connecting and fixing the plate 3 are arranged. The platen fixing portion 21 is set lower from the upper surface of the support plate 19 through a step difference, so that the upper surface (mounting surface) of the support plate 19 and the upper surface of the platen 3 are arranged on a single plane. In the side end on the left side of the base portion 11, a lower feeding tooth 22, a thread hook (not shown), and a cutter portion 23 (refer to FIG. 5) that cut the sewn immediately before sewing are arranged. The lower feeding teeth 22 are arranged to move in a fixed behavior in the front-rear direction and the up-down direction by a feeding-gear drive mechanism not shown. By moving the lower cloth feed teeth 22 and contacting the sewing object from the lower surface side, the sewing object can be intermittently conveyed forward (downstream). Here, the so-called intermittently conveying the article to be sewn refers to alternately repeating the conveying state in which the lower feeding teeth 22 contact the article to be sewn and moving the article to be sewn at a fixed distance and the feeding state without using the lower feeding teeth 22. The stop state of the movement of the sewing product. The thread hook not shown in the figure can be moved in a specific behavior by using the thread hook driving mechanism, and cooperates with the two sewing machine needles 15 to form a seam for the hemming of the sewing object. The cutter part 23 of this embodiment is located in the cloth feed direction (front-rear direction) of the sewing machine, and is arranged at the position of the sewing machine needle 15 and the position where the following introduction roller 31 contacts the sewing product (in other words, the following roller body 31a lower end position) between. Moreover, the cutter part 23 has a fixed knife (lower knife) 23a and a movable knife (upper knife) 23b as shown in FIG. The fixed knife 23a of the cutter part 23 is arrange|positioned so that the cutting edge may become the same height position (position in the up-down direction) as the upper surface of the support plate 19. As shown in FIG. The movable knife 23b is in a state where a part of the movable knife 23b protrudes upward from the upper surface of the support plate 19, and is arranged to be movable up and down by a movable knife drive mechanism not shown. Furthermore, the cutting blade of the movable knife 23b is provided so that it may incline diagonally upwards toward the back. In the cutter portion 23, the movable knife 23b is in contact with the side surface of the fixed knife 23a while moving up and down, so that the cutting edge of the movable knife 23b and the cutting edge of the fixed knife 23a can be used to transport the sewn material forward Cut off in order. Furthermore, the sewing machine 10 of this embodiment is provided with one or more drive sources (sewing machine motors, etc.) that drive the various drive mechanisms described above, or a control unit that controls the drive sources. Furthermore, the sewing machine 10 of this embodiment is provided with an introduction roller 31 that guides the article to be sewn between the support plate 19 and the sewing machine presser foot 18, a roller holding portion 32 that rotatably holds the introduction roller 31 at a specific position, and The roller drive part 33 which rotates and drives the introduction roller 31, and the drive control part which is not shown in figure which controls the drive of the roller drive part 33. In this case, the roller holding portion 32 is fixed to the support plate 19. The introduction roller 31 has a cylindrical roller body 31 a and a rotation shaft portion 31 b extending from the roller body 31 a to the right, and the rotation shaft portion 31 b of the introduction roller 31 is pivotally supported by the roller holding portion 32. In addition, at the right end of the rotating shaft portion 31b of the introduction roller 31, a first pulley 34 on which a belt is wound 36 is arranged. The roll body 31a of the introduction roll 31 has a metal roll core portion 31c that is circular as shown in FIG. 4 when viewed from the left and right direction, and is arranged on the outside of the roll core portion 31c and is made of polyurethane or the like. The resin-formed annular outer peripheral edge portion 31d, and the synthetic resin outer peripheral edge portion 31d directly contacts the upper surface of the sewing object. In this case, the introduction roller 31 is held in the height direction (up and down direction) by the roller holding portion 32 at a position where the roller body 31a and the object to be sewn are properly contacted, and a space for the sewn is formed between the roller body 31a and the support plate 19 A moderate gap through which things pass. In addition, the introduction roller 31 is positioned so that the downstream end (front end) of the roller body 31a is located more upstream (rear) than the sewing machine needle 15 in the cloth feeding direction (front-rear direction) of the sewn, and further The movable knife 23b of the cutter part 23 is arranged further to the upstream side (rearward). Furthermore, in this embodiment, the introduction roller 31 is arranged in a state where a part of the roller body 31a is inserted into the receiving recess of the sewing machine presser foot 18, and the downstream end (front end) of the roller body 31a is arranged to be lower than the sewing machine presser. The upstream end (rear end) of the leg 18 is closer to the downstream (forward) side. In this case, the outer peripheral surface of the roller body 31a arranged at the lower end is arranged on the pressing surface of the sewing machine presser foot 18 (that is, the lower surface of the presser body portion 18a) in the feeding direction (front-rear direction) of the sewing product. ) Is closer to the upstream side, whereby the roller body 31a can be sewn at a position that is more upstream than the contact position of the pressing surface of the sewing machine presser foot 18 with the object being sewn.物contact. The roller driving part 33 of this embodiment is fixed to the leg part 12 of the sewing machine 10 via a bracket or the like. The second pulley 35 is arranged on the drive shaft of the roller drive section 33. The second pulley 35 is connected to the first pulley 34 provided on the rotating shaft portion 31b of the introduction roller 31 via the belt 36, whereby the power (rotation) of the roller drive portion 33 is transmitted to the introduction roller 31. By providing the roller drive unit 33 in this way, the introduction roller 31 can be rotated and driven by a simple structure, and the rotation control of the introduction roller 31 (drive control of the roller drive unit 33) can be easily and stably performed. Furthermore, in the present invention, the roller drive unit 33 as described above may not be provided, and for example, by connecting the rotating shaft portion 31b of the guide roller 31 to the driving source (e.g., sewing machine motor) of the sewing machine 10 via an electromagnetic clutch or the like, The power of the driving source (the rotation of the sewing machine motor) is transmitted to the introduction roller 31 to drive the introduction roller 31 to rotate. Moreover, in this case, the drive rotation (ON) and stop (OFF) of the introduction roller 31 can be switched by the control of the electromagnetic clutch. The drive control unit of the roller drive unit 33 is formed to be able to control the rotation speed of the introduction roller 31 by the control of the drive of the roller drive unit 33. Thereby, the drive control unit can synchronize the introduction speed (feeding) of the article to be sewn under the presser foot 18 of the sewing machine by the introduction roller 31 and the feeding speed of the article to be sewn by the lower feeding teeth 22. The rotation speed of the lead-in roller 31 is appropriately controlled according to the feeding speed by the lower feeding teeth 22. Here, the introduction speed of the article to be sewn by the introduction roller 31 refers to the speed at which the article to be sewn is introduced between the presser foot 18 and the support plate 19 of the sewing machine when the introduction roller 31 contacts the article to be sewn and rotates. In addition, the drive control unit of the roller drive unit 33 is formed to be able to control the operation (ON) and stop (OFF) of the roller drive unit 33. Thereby, the introduction roller 31 can be held rotatably by stopping the roller drive section 33. Therefore, for example, when the article to be sewn is conveyed by the lower feeding teeth 22, when the roller driving section 33 is stopped while the guide roller 31 is in contact with the article to be sewn, the gap between the article and the article can be generated The friction rather than the drive of the roller drive unit 33 causes the guide roller 31 to rotate in a driven manner. Next, the method of automatically performing the sewing step (overlocking step) is described. The sewing step (overlocking step) uses the sewing device 1 of this embodiment described above, while cutting off the crotch opening 50 before the zipper 51 is installed. While facing the side edge of the crotch opening 50 before being cut, hemming is performed. First, as shown in FIG. 6, the crotch opening 50 before the crotch opening 50 has a rectangular shape in a plan view, and the side edges of the short side of the crotch opening 50 in the rectangular shape are fed along the cloth feeding teeth 22. It is placed in a specific position on the platen 3 in a direction-like direction. At this time, the left and right element rows of the zipper 51 of the front crotch opening 50 are engaged, and the front crotch opening 50 is placed on the table 3 without bending the fabric 53 of the front crotch opening 50 in a straight state. Furthermore, the placement of the front crotch opening 50 can be performed manually by an operator, or it can be mechanically and automatically performed by a supply device of the crotch opening 50, which is not shown, regardless of manpower. Also, at this time, the sewing machine presser foot 18 of the sewing machine 10 is maintained at a raised position away from the object to be sewn. After placing the front crotch opening 50 at a specific position on the table 3, the automatic arm 5a of the automatic conveying part 5 shown in FIG. 1 moves above the front crotch opening 50, as shown in the two-point chain in FIG. As shown by the line, the front crotch opening 50 is pressed and held from above. Then, the automatic arm portion 5a moves while pressing the front crotch opening 50 from above, so that the sewing start part of the front crotch opening 50 where the hemming starts to pass between the support plate 19 and the introduction roller 31, and It is arranged at a position (sewing start position) that can be sandwiched between the upper part of the pressing surface of the support plate 19 and the presser foot 18 of the sewing machine. At the same time, using the automatic arm 5a of the automatic conveying unit 5, the longitudinal direction of the front crotch opening 50 is orthogonal to the cloth feeding direction by the lower feed teeth 22 (the short side of the front crotch opening 50 The side edge portion of the lower cloth feed tooth 22 maintains the direction (posture) of the front crotch opening 50 in a manner parallel to the cloth feeding direction. In addition, the above-mentioned movement of the automatic arm part 5a of the automatic conveyance part 5 is controlled by the control part of the automatic conveyance part 5 which is not shown in figure. After the front crotch opening 50 is moved and held at the sewing start position, the sewing machine presser foot 18 of the sewing machine 10 is automatically lowered and held at the pressing position. Thereby, the sewing machine presser foot 18 presses the sewing start part of the front crotch opening 50 from the upper surface side toward the support plate 19, and the support plate 19 and the sewing machine presser foot 18 clamp the sewing start part. In addition, at this time, for example, by temporarily bending the zipper chain cloth 52 of the zipper 51 on the side close to the sewing start part, so that it is located on the upper side or the lateral side of the sewing machine presser foot 18, the zipper chain can be The cloth 52 is hemmed, and the hemming is not hemmed (refer to FIGS. 9 and 10). Furthermore, in the present invention, whether to hem the zipper chain cloth 52 of the zipper 51 can be arbitrarily selected according to the use of the crotch opening 50 before being manufactured. After the sewing machine presser foot 18 presses the sewing start part of the front crotch opening 50, the guide roller 31, the lower feed tooth 22, the cutter part 23, the sewing machine needle 15 (needle seat 16), the thread hook, etc. correspond to each The driving part of the operation and drive them. Thereby, the intermittent conveyance of the front crotch opening 50 using the lower feed teeth 22 is started, and the sewing machine needle 15 or the thread hook is moved in accordance with the conveyance performed by the lower feed teeth 22, thereby, the front The side edge portion (the first straight portion 55a) on the short side of the crotch opening portion 50 starts to be hemmed (refer to FIG. 7). At the same time, the introduction roller 31 contacts the front crotch opening portion 50 and rotates, and the rotation friction force of the introduction roller 31 guides the front crotch opening portion 50 between the sewing machine presser foot 18 and the support plate 19. Thereby, the front crotch opening 50 is forcibly fed between the sewing machine presser foot 18 and the support plate 19, and the conveying of the front crotch opening 50 by the lower feeding teeth 22 is assisted. Therefore, it is possible to suppress occurrence of troubles such as the front crotch opening 50 being caught between the sewing machine presser foot 18 and the support plate 19. In this case, in the introduction roller 31 of this embodiment, the roller body 31a is formed in a cylindrical shape. Therefore, the outer peripheral surface of the rotating roller body 31a can be firmly contacted with the front crotch opening 50, and the introduction roller can be used 31. The feeding operation of the front crotch opening 50 is performed stably. Particularly in this embodiment, when the side edges of the linear shape such as the first straight portion 55a of the front crotch opening portion 50 or the second straight portion 55c described below are hemmed together, the introduction roller 31 can be used to stably Carry in. Moreover, when the introduction roller 31 is used to feed the front crotch opening 50 as described above, the rotation speed of the introduction roller 31 is such that the introduction roller 31 guides the front crotch opening 50 to the sewing machine presser foot 18 and the support plate. The introduction speed between 19 (the feeding speed of the front crotch opening 50) is synchronized with the feeding speed of the crotch opening 50 before the bottom feeding teeth 22. The driving control part of the roller driving part 33 and the bottom feeding The feeding speed of the crotch opening 50 before the cloth teeth 22 is controlled accordingly. Here, the so-called intermittent feeding speed of the crotch opening 50 before being carried out by the lower feeding teeth 22 is synchronized with the continuous feeding speed of the introduction roller 31, and refers to the above 2 per unit time (specific time) The speed becomes the same size. This prevents excessive introduction of the front crotch opening 50 under the sewing machine presser foot 18 by the introduction roller 31, or insufficient rotation of the introduction roller 31 (insufficient feeding of the front crotch opening 50). When the crotch opening 50 is caught by the introduction roller 31 or the like or the front crotch opening 50 is partially elongated, the sewing can be performed smoothly. In this embodiment, as a step of sewing (overlocking) a front crotch opening portion 50, the following steps are performed: The first sewing step is from the sewing start portion of the front crotch opening portion 50 The straight side edge part (the first straight part 55a) of the short side is sewn straightly; the second sewing step (curve overlocking step) is after the first sewing step, one side uses the cutter part 23 Cut the side edge of the front crotch opening 50 into an arc shape, and hem and sew along the side edge (curved portion 55b) formed in the arc shape; and the third sewing step, which is After the second sewing step, the side edge of the front crotch opening 50 is cut linearly by the cutter portion 23, and the side edge portion (the second linear portion 55c) formed in a linear shape is wrapped along the side edge portion (the second linear portion 55c). The edges are sewn together. Furthermore, in this embodiment, when the first straight portion 55a, which is a part of the side edge portion on the short side of the front crotch opening 50, is hemmed in the first sewing step, cutting is not used The organ part 23 performs cutting processing of the front crotch opening 50. However, in the present invention, in the first sewing step, while cutting the front crotch opening 50 from the sewing start portion of the front crotch opening 50 into a straight or curved shape by the cutter part 23, The side edges formed by this cutting are hemmed together. In the above-mentioned first sewing step of this embodiment, the front crotch opening 50 is fed under the sewing machine presser foot 18 by the introduction roller 31, and the first straight portion 55a of the front crotch opening 50 is hemmed. Sew together. In this way, by using the introduction roller 31 to feed the front crotch opening 50, for example, even if the front crotch opening 50 is conveyed by the lower feed teeth 22, the cloth 53 in the front crotch opening 50 is partially gathered. Or wrinkles, before the gathered or wrinkled part is introduced between the support plate 19 and the sewing machine presser foot 18, the continuously rotating introduction roller 31 contacts the part to correct the gathered or wrinkled, so that the cloth 53 can return to normal The (usual) state. Furthermore, by the rotating introduction roller 31 contacting the front crotch opening 50, the contacted part can be continuously and forcibly fed between the support plate 19 and the sewing machine presser foot 18 in a sliding manner. During sewing, troubles such as the front crotch opening 50 getting stuck in the sewing machine presser foot 18 or the support plate 19 are less likely to occur. Furthermore, in this first sewing step, after the cloth 53 (the cloth 53 on the left side) of the crotch opening 50 before the zipper cloth 52 (the zipper cloth 52 on the left) one of the zippers 51 is attached , The other zipper chain cloth 52 (the zipper chain cloth 52 on the right side) of the zipper 51 and the cloth 53 (the cloth 53 on the right side) of the crotch opening 50 before the other zipper chain cloth 52 is installed are continuously stitched. . In this case, in order to overlap the zipper chain cloth 52 on the right side with the cloth 53 on the right side, the front crotch opening 50 is formed with a step equivalent to the thickness of the zipper chain cloth 52 (especially the difference in the thickness of the zipper chain cloth 52). The thickness of the core rope at the edge of the chain cloth side is equivalent to the step difference). In the first sewing step of this embodiment, even when the hemming is performed from the fabric 53 on the left to the zipper chain 52 on the right and the fabric 53 on the right, the step as described above is formed in the front crotch opening 50 It is also possible to forcibly feed the front crotch opening 50 under the sewing machine presser foot 18 by using the introduction roller 31 to prevent the step difference of the front crotch opening 50 from being caught by the sewing machine presser foot 18, thereby the sewing machine presser foot 18 Smoothly cross the step difference of the front crotch opening 50. Furthermore, when the overlapped right side zipper cloth 52 and the right side cloth 53 are hemmed, for example, even if the flexibility of the cloth 53 is high, there is a difference in rigidity between the cloth 53 and the zipper chain 52. At this time, it is also possible to feed in the front crotch opening 50 by the introduction roller 31, and while appropriately conveying both the cloth 53 and the fastener chain 52, the hemming can be stably and smoothly sewn. Furthermore, in the first sewing step of this embodiment, it is also possible to stop the driving of the guide roller 31 by the roller drive unit 33 and interrupt the feeding operation by the guide roller 31, while placing the guide roller 31 in and When the front crotch opening portion 50 is in contact with the front crotch opening portion 50, it is driven and rotated by the conveyance of the front crotch opening portion 50, and the hemming is sewn. After performing the above-mentioned first sewing step at a predetermined distance on the side edge of the short side of the front crotch opening portion 50 of the rectangular shape, the second sewing step is continuously performed. In the second sewing step, the automatic arm portion 5a of the automatic conveying unit 5 is pressed against the front crotch opening 50 from above, and as shown in FIGS. 7-9, the front crotch opening 50 is placed on the support plate 19 The upper surface and the upper surface of the table 3 are rotated at a specific rotation speed, whereby the cutter portion 23 of the sewing machine 10 is used to move from the side edge of the short side of the crotch opening portion 50 to the long side of the rectangular shape. The side edge part cuts the front crotch opening 50 so as to bend into an arc shape. At the same time, the side edge portion (curved portion 55b) of the arc shape formed by the cutting is overwrapped (curved overlock). In the second sewing step, the introduction roller 31 is continuously used to feed the front crotch opening 50 from the first sewing step. However, in the second sewing step, the front crotch opening 50 is made to use the lower cloth feed teeth 22. Compared with the first sewing step, the feeding speed of the cloth is reduced, and the introduction speed (feeding speed) of the crotch opening 50 before the introduction roller 31 is made to be the same as that of the lower feeding teeth 22 by the drive control section of the introduction roller 31 The feed speed is synchronized with the deceleration. In this second sewing step, as described above, the front crotch opening 50 is rotated by the automatic arm 5a of the automatic conveying unit 5, and the hemming is sewn together. Therefore, it is considered that, for example, if the lower feed tooth is used The cloth feed speed of 22 is set to the same speed as the first sewing step. Due to the influence of the pressing of the presser foot 18 of the sewing machine, it is easier to produce localized patterns in the fabric 53 of the front crotch opening 50 than in the first sewing step. Gather or fold. However, as described above, the feeding speed by the lower feeding teeth 22 in the second sewing step and the lead-in speed (feeding speed) by the lead-in roller 31 in the second sewing step are made slower than in the first sewing step, thereby eliminating the use of the lead-in roller 31. In addition to the effect of the previous feeding of the crotch opening portion 50, the fabric 53 of the front crotch opening portion 50 is less likely to gather or wrinkle. Thereby, while the front crotch opening portion 50 is rotated, while facing the curved portion 55b of the front crotch opening portion 50, the hemming can be stitched stably and smoothly. After performing the above-mentioned second sewing step at a specific distance, the third sewing step is continuously performed. In the third sewing step, while pressing the front crotch opening 50 by the automatic arm 5a, the front crotch opening 50 is moved parallel to the cloth feeding direction of the sewing machine 10, thereby, as shown in FIG. 10, The side edge portion of the front crotch opening 50 can be cut linearly by the cutter portion 23, and it can be continuously performed along the side edge portion (the second linear portion 55c) that is formed linearly by the cutting The hemming is sewn to the side edge of the short side of the front crotch opening 50. In addition, in FIG. 10, the illustration of the automatic arm 5a is omitted. In the third sewing step, the feed speed by the lower feed teeth 22 is set faster than the second sewing step, preferably faster than the first sewing step, and the use of the roller drive unit is stopped. 33, the introduction roller 31 is driven, and the previous feeding operation of the crotch opening 50 by the introduction roller 31 is temporarily interrupted. Here, the term “stopping the introduction roller 31 and interrupting the feeding operation” means that the driving of the introduction roller 31 by the roller drive unit 33 is continuously stopped while the lower feeding teeth 22 are intermittently conveyed two or more times. In addition, when the feeding operation is interrupted, the introduction roller 31 comes into contact with the crotch opening 50 before being intermittently conveyed by the lower feeding teeth 22. Therefore, the introduction roller 31 itself is driven by the friction force between the introduction roller 31 and the front crotch opening portion 50 instead of being driven by the roller drive portion 33, and corresponds to the transportation (movement) of the front crotch opening portion 50 Intermittent rotation. In the third sewing step of this embodiment, the feeding speed of the lower cloth feeding teeth 22 can be increased as described above, and the sewing speed of the hemming of the front crotch opening 50 can be increased, thereby enabling The hemming is sewn efficiently. In addition, with the increase in sewing speed, for example, it is possible to prevent the front crotch opening 50 from being easily generated due to the difference between the intermittent feeding by the lower feeding teeth 22 and the continuous feeding by the introduction roller 31. In the case of jamming and other maladies, the second straight portion 55c of the front crotch opening portion 50 is stitched stably and smoothly. Furthermore, in the third sewing step, as necessary, the introduction roller 31 may be driven by the roller driving unit 33, and the front crotch opening 50 may be fed in by the introduction roller 31, while hemming may be performed. According to the sewing method of the present embodiment as described above, even if the crotch opening 50 before the arc-shaped curved portion 55b is automatically transported (moved at the same time), the automatic hemming step of hemming and sewing is performed. Furthermore, even if there is a difference in rigidity between the fabric 53 of the front crotch opening 50 and the fastener chain 52 of the zipper 51, the front crotch opening 50 can be continuously and forcibly fed in by the rotation of the introduction roller 31 To between the support plate 19 and the sewing machine presser foot 18. Therefore, even if the lower cloth feeding teeth 22 are generally used as the simple structure of the cloth feeding mechanism of the front crotch opening 50, it is possible to effectively prevent the front crotch opening 50 from getting stuck in the sewing machine presser foot 18 or support during sewing. The plate 19 conveys both the cloth 53 and the zipper chain 52 appropriately, while facing the side edge of the front crotch opening 50 smoothly and stably and automatically hem stitching. And after the first to third sewing steps as described above are performed and the hemming (overlocking) of the front crotch opening 50 is completed, the front crotch opening is pressed from above by the automatic arm 5a 50 conveys it to the recovery part not shown, and the crotch opening part 50 before the hemming is stored in the recovery part. Thereby, the crotch opening part 50 before hemming along the side edge part provided with the arc-shaped curve part 55b is produced. In addition, simultaneously with the recovery of the front crotch opening 50 as described above, a rectangular front crotch opening 50 is placed on the table 3 as shown in FIG. position. By repeatedly performing the above-mentioned steps, a plurality of front crotch openings 50 can be automatically sewed smoothly and stably. Therefore, it is possible to achieve the efficiency of selvedge and reduce the manufacturing cost of the front crotch opening 50. In addition, since the crotch opening 50 before the arc-shaped curved portion 55b is formed on the side edge portion, the hemming stitching can be automatically and mechanically repeated without manpower, so it is not easy to implement the hemming There is a difference in quality among the plurality of front crotch openings 50 that are gathered together. Furthermore, in the introduction roller 31 arranged in the sewing machine 10 of the above-mentioned embodiment, as shown in FIG. 2 etc., the roller body 31a contacting the front crotch opening 50 is formed in a cylindrical shape with the rotation axis as the axis. However, the introduction roller in the present invention may also be formed in such a way that the roller body contacting the front crotch opening has the shape shown in FIG. 11 or the shape shown in FIG. 12, for example. For example, the roll body 38a of the introduction roll 38 of the modified example shown in FIG. 11 is formed as a cone having a tapered portion whose size in the radial direction from the shaft center of the roll body 38a to the outer periphery gradually decreases toward one side (left side) of the axial direction. Type shape. In addition, the roll body 39a of the introduction roll 39 shown in FIG. 12 is formed in a spherical shape. The introduction rollers 38, 39 having the roller bodies 38a, 39a shown in FIG. 11 or 12 are compared with the introduction roller 31 of the above-mentioned embodiment, although the contact area of the rotating roller bodies 38a, 39a and the front crotch opening 50 is larger. It is small, but it is formed so that the outer peripheral surface of the roller body 38a, 39a becomes a curved surface which curves with respect to the left-right direction. Furthermore, in the case of the introduction roller 38 in FIG. 11, although the ridge portion (edge portion) is arranged on the contact surface of the roller body 38a that is in contact with the front crotch opening 50, the ridge portion of the roller body 38a is similar to that of the above embodiment The ridgeline portion of the introduction roller 38 is formed more gently than that. On the other hand, in the case of the introduction roller 39 in FIG. 12, the entire contact surface of the roller body 39a that is in contact with the front crotch opening 50 is formed as a smooth curved surface without a ridge portion. Therefore, the front crotch opening portion 50 is fed in by the introduction rollers 38, 39 having the roller body 38a of FIG. 11 or the roller body 39a of FIG. 12, and the curved portion 55b of the front crotch opening portion 50 is bounded. When sewing, even if the front crotch opening 50 is rotated on the upper surface of the support plate 19, the roller bodies 38a, 39a are less likely to be caught in the roller body 31a of the introduction roller 31 (FIG. 2) of the above embodiment Front crotch opening 50. Thereby, for example, the sewing speed in the second sewing step described above can be increased, and the hemming of the front crotch opening 50 can be efficiently performed in a shorter time. Furthermore, in the above-mentioned embodiment, in the third sewing step of hemming the second straight portion 55c of the front crotch opening portion 50 using the sewing machine 10, the driving of the introduction roller 31 by the roller drive portion 33 is stopped Then, the previous feeding operation of the crotch opening 50 by the introduction roller 31 is interrupted. In this regard, in the present invention, for example, in addition to the structure of the sewing machine 10 of the above-mentioned embodiment, a roller moving part not shown may be further provided, which can move the roller body 31a of the guide roller 31 to the roller body. 31a is in contact with the front crotch opening portion 50 and is rotatable contact position (e.g., a lowered position), and the roller body 31a is away from the front crotch opening portion 50 without contacting the front crotch opening portion 50 and is rotatable away (e.g., rising Position) and keep it. In the case of a sewing machine equipped with such a roller moving part, for example, in the first sewing step of wrapping the first straight portion 55a of the front crotch opening portion 50, and wrapping the curved portion 55b of the front crotch opening portion 50 In the second sewing step of side stitching, the roller body 31a of the guide roller 31 can be moved to the contact position (down position) and held by the roller moving part, so that the roller body 31a and the front crotch opening 50 In contact, as in the case of the above-mentioned embodiment, the forward crotch opening 50 is stably carried out by the introduction roller 31. Furthermore, in the third sewing step of hemming the second straight portion 55c of the front crotch opening portion 50, the roller body 31a of the introduction roller 31 is moved to the distant position (rising position) by using the roller moving portion And hold it, even if the drive of the introduction roller 31 by the roller drive unit 33 is not stopped (in other words, even if the drive of the introduction roller 31 is continued by the roller drive unit 33 to continuously rotate the roller body 31a), the roller body 31a is still Since it is not in contact with the front crotch opening 50, the feeding operation of the front crotch opening 50 by the introduction roller 31 can be temporarily interrupted. In this way, in the third sewing step where the sewing speed (the feeding speed of the lower feeding teeth 22) is relatively fast, the roller body 31a of the introduction roller 31 can be completely separated from the front crotch opening 50, thereby reliably preventing the introduction The roller 31 is caught in the front crotch opening 50 and other defects, so that the third sewing step can be performed more smoothly and stably.

1‧‧‧Sewing device (overlocking device) 3‧‧‧Table (work table) 5‧‧‧Automatic conveying part 5a‧‧‧Automatic arm (mechanical arm) 10‧‧‧Sewing machine (lock stitching machine) 11 ‧‧‧Machine base 12‧‧‧Pole 13‧‧‧Arm 15‧‧‧Sewing machine needle 16‧‧‧Needle seat 17‧‧‧Pressing bar 18‧‧‧Sewing machine presser foot 18a‧‧‧Pressing script Body 18b‧‧‧Presser foot front end 19‧‧‧Support plate (needle plate) 21‧‧‧Table fixing part 22‧‧‧Lower feed tooth 23‧‧‧Cutter part 23a‧‧‧Fixed knife ( Bottom knife) 23b‧‧‧Movable knife (upper knife) 31‧‧‧Introduction roller 31a‧‧Roll body 31b‧‧‧Rotating shaft part 31c‧‧‧Roll core part 31d‧‧‧Outer peripheral edge part 32‧‧‧ Roll holding part 33‧‧‧Roll driving part 34‧‧‧First pulley 35‧‧‧Second pulley 36‧‧‧Belt 38‧‧‧Introduction roller 38a‧‧‧Roll body 39‧‧‧Introduction roller 39a‧‧ ‧Roller body 50‧‧‧Front crotch opening 51‧‧‧Zipper 52‧‧‧Zipper chain 53‧‧‧Fabric 55a‧‧‧First straight part 55b‧‧‧Curved part 55c‧‧‧Second straight part

Fig. 1 is a front view showing a sewing device with a sewing machine and an automatic conveying part according to an embodiment of the present invention. Figure 2 is a perspective view of the sewing machine. Figure 3 is a side view of the sewing machine. Fig. 4 is an enlarged cross-sectional view showing an enlarged main part of the sewing machine. Figure 5 is a cross-sectional view of the main part of the sewing machine viewed from the side of the leg. Fig. 6 is a schematic diagram schematically showing a state before the front crotch opening is placed at a specific position of the sewing device. Fig. 7 is a schematic diagram schematically showing a state where the front crotch opening is placed at a specific position of the sewing device and pressed by the presser of the sewing machine. Fig. 8 is a schematic diagram schematically showing a state where the first straight portion of the front crotch opening portion is hemmed together. Fig. 9 is a schematic diagram schematically showing a state in which the curvilinear portion of the front crotch opening is hemmed together. Fig. 10 is a schematic diagram schematically showing a state where the second straight portion of the front crotch opening portion is hemmed together. Fig. 11 is an enlarged perspective view showing an enlarged main part of a sewing machine according to a modification of the present invention. Fig. 12 is an enlarged perspective view showing an enlarged main part of a sewing machine according to another modification of the present invention.

3‧‧‧Plate (workbench)

10‧‧‧Sewing machine (lock stitch machine)

11‧‧‧Framework

12‧‧‧Pole

13‧‧‧Arm

15‧‧‧Sewing machine needle

16‧‧‧Needle seat

17‧‧‧Press rod

18‧‧‧Sewing machine presser foot

19‧‧‧Support board (needle board)

21‧‧‧Table fixing part

31‧‧‧Introduction roller

31a‧‧‧Roller body

32‧‧‧Roller holding part

33‧‧‧Roller drive

34‧‧‧The first pulley

35‧‧‧The second pulley

36‧‧‧Belt

Claims (12)

A sewing machine, which is a sewing machine (10), is provided with a support plate (19) on which a sewn object (50) is placed, a sewing machine presser foot (18) that presses the sewn object (50) toward the support plate (19), The sewing machine needle (15) that moves up and down with respect to the support plate (19), and the lower feed tooth (22) that contacts the sewing object (50) from the lower surface side and intermittently conveys the sewing object (50) , Characterized in that: the sewing machine (10) is equipped with the sewing machine (10) by rotating in a state in contact with the sewing object (50) to introduce the sewing object (50) to the support plate (19) and the sewing machine presser foot ( 18) between the introduction rollers (31, 38, 39) and the introduction rollers (31, 38, 39) to move the sewing object (50) from the upstream side of the sewing machine needle (15) to the downstream side In the direction of rotation, the roller driving section (33) that continuously drives the introduction rollers (31, 38, 39) to rotate, and the introduction of the introduction rollers (31, 38, 39) in the sewing object (50) The lower feeding tooth (22) is arranged at least upstream of the position of the sewing machine needle (15) in the feeding direction. Such as the sewing machine of claim 1, wherein the above-mentioned introduction roller (31, 38, 39) is located at a position more upstream than the position where the pressing surface of the above-mentioned sewing machine presser foot (18) meets the above-mentioned sewing object (50) and The above-mentioned to-be-sewn (50) touches. For example, the sewing machine of claim 1 or 2, which is equipped with a drive control unit that controls the drive of the roller drive unit (33), and the drive control unit makes the rotation speed of the introduction roller (31, 38, 39) and The feeding speed of the sewing object (50) is controlled by the lower feeding tooth (22) corresponding to that of the upper The sewing position of the sewing object (50) corresponds to the operation and stopping of the roller drive unit (33). Such as the sewing machine of claim 1 or 2, which is equipped with a roller moving part that moves the introduction roller (31, 38, 39) to the introduction roller (31, 38, 39) and the sewing object (50 ) The contact position of the contact, and the position of the introduction roller (31, 38, 39) away from the sewing object (50), and the roller moving part corresponds to the sewing position of the sewing object (50) to make the The introduction rollers (31, 38, 39) move to the contact position or the distance position and hold it. The sewing machine of claim 1 or 2, wherein the introduction roller (31, 38, 39) has a cylindrical shape whose radial dimension from the shaft center of the introduction roller (31, 38, 39) to the outer periphery is a fixed size , At least a part of the introduction roller (31, 38, 39) has a conical shape or a spherical shape with a tapered portion whose size in the radial direction from the axial center to the outer peripheral edge decreases toward one side of the axial direction. Such as the sewing machine of claim 1 or 2, which is to hem the above-mentioned sewn article (50). For example, the sewing machine of claim 6, which is equipped with a cutter part (23) for cutting the sewing article (50), and the cutter part (23) is used for the cloth feeding by the lower feeding tooth (22) In the direction, it is arranged between the position where the introduction rollers (31, 38, 39) contact the object to be sewn (50) and the position of the sewing machine needle (15). A sewing device, characterized by having: a sewing machine such as any one of claims 1 to 7 (10); and an automatic conveying portion (5), which can accompany the sewing object (50) performed by the lower feeding tooth (22) when the sewing machine (10) is used to sew the sewing object (50) ) Is conveyed so that the sewing object (50) is automatically rotated in a fixed motion. A sewing method that uses a sewing machine (10) to sew an article (50) to be sewn. The sewing machine (10) is provided with a support plate (19) on which the article to be sewn (50) is placed, and the article to be sewn ( 50) The sewing machine presser foot (18) that is pressed toward the support plate (19), the sewing machine needle (15) that moves up and down with respect to the support plate (19), and the sewing machine needle (15) touches the sewing object (50) from the lower surface side and intermittently The lower feed tooth (22) of the sewing object (50) is transported sexually, and the sewing method is characterized by including the following steps: using the sewing machine (10), the sewing machine (10) is further provided with the sewing object (50) ) Guide rollers (31, 38, 39) between the support plate (19) and the sewing machine presser foot (18), and turn the guide rollers (31, 38, 39) toward the sewing object (50) ) A roller driving section (33) that continuously rotates and drives the introduction rollers (31, 38, 39) from the upstream side of the sewing machine needle (15) to the downstream side; and for the sewing machine When sewing at least a part of (50), the introduction rollers (31, 38, 39) are brought into contact with the sewing object (50), and the introduction rollers (31, 38, 39) are driven by the roller drive unit (33). ) Continuously rotating, thereby introducing the sewing object (50) between the supporting plate (19) and the sewing machine presser foot (18). Such as the sewing method of claim 9, which includes adjusting the feeding speed of the sewing article (50) using the lower feeding teeth (22) and the sewing article (31, 38, 39) using the introduction rollers (31, 38, 39). 50) The import speed is synchronized. Such as the sewing method of claim 9 or 10, which includes the following steps: using the crotch opening (50) before the zipper (51) is installed as the sewing object (50); using the sewing machine (10) to align the front crotch opening (50) performing hemming; and when performing the hemming of at least the arc-shaped curved portion (55b) formed in the front crotch opening portion (50), the introduction rollers (31, 38, 39) ) Is in contact with the front crotch opening portion (50), and the introduction roller (31, 38, 39) is continuously rotated by the roller drive unit (33). Such as the sewing method of claim 11, which includes the hemming of the straight side edge portion (55c) continuously formed from the curve portion (55b) in the front crotch opening portion (50), using the The driving of the introduction rollers (31, 38, 39) by the roller drive unit (33) is stopped, or the introduction rollers (31, 38, 39) are moved away from the front crotch opening (50).

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