JP5535980B2 - ROCK SEWING MACHINE, SEWING METHOD USING THE SAME, AND SEWING PRODUCT SEWED BY THE METHOD - Google Patents

Description

    The present invention relates to a lock sewing machine, and in particular, a field of manufacturing and providing a lock sewing machine that can be swung, and a sewing product that is sewn by that, as well as transportation, storage, assembly, and the like. From the field of providing and selling equipment and equipment necessary for installation, materials such as wood, stone, various fibers, plastics, various metal materials, etc. required for such materials, machinery and parts are provided. Field, the field of electronic components incorporated in them, the field of control-related equipment that integrates them, the field of various measuring instruments, the field of the equipment, the power machine that moves the instrument, the electric power that is the energy and the electricity, the energy source Fields generally referred to as industrial machinery, such as fields, and testing and researching those facilities and equipment, and also involved in their display, sales, import and export Fields related to the collection, transportation, etc. of waste debris generated by the operation of equipment, equipment used to build them, and equipment, and recycling that efficiently reuses such waste debris There are no technical fields that are not related to other fields, such as new fields that cannot be envisaged at this time.

(Points of interest)
The process of sewing the hem of the garment is usually performed in the procedure of edge stitching using a lock sewing machine and then scooping and finishing using a rake sewing machine. As shown in the perspective view of the stitched fabric, when stitching two pieces of fabric W, W which are edged stitches X, X, the edge stitches X, X of the fabrics W, W are more Sew stitches slightly closer to the center of each fabric W and W are straight-sewn Y with a main sewing machine, and then sew stitches Z and Z between each edge stitch X, X and the straight stitching Y place with a rake sewing machine However, it is necessary to prepare various sewing machines such as a lockstitch machine, a lock sewing machine, and a rake sewing machine, and an employee who is skilled in the operation of these sewing machines must work through the respective steps in order. The key to increase production costs It had become.

(Conventional technology)
(Conventional technology)
Reflecting this situation, proposals that can be used to overcome this situation are not unheard of.
For example, as represented by the one proposed in Patent Document 1 (1) below, an overlock sewing needle bar is provided with an edge stitching needle and a main stitch stitching needle in parallel. Safety sewing consisting of sewing and main sewing can be performed in one process, or a needle bar holding a plurality of needles, two or three rules as seen in the same patent document 1 (2) In an overlock sewing machine equipped with a part and forming an edge seam and double ring seam on the sewing product, the cloth feed direction of the sewing product and the vertical reciprocation direction of the needle bar in the direction substantially orthogonal to the sewing machine A needle bar moving mechanism for moving the needle bar is provided, which has both an edge stitching function and a zigzag stitching function, and is capable of various pattern sewings. Removable sewing unit with sewing mechanism Next, when producing a single-function sewing machine, the assembly becomes easy. When producing a composite sewing machine, the desired sewing can be performed simply by connecting a sewing unit having a predetermined single function to the sewing machine body. In some cases, the structure is simple and easy to use, and it is possible to reduce failures and misoperations.

However, the edge stitches and the main stitches that can be formed in the same sewing process as shown in the former patent document 1 (1) are used for the needle bar of the overlock sewing machine and the edge stitches are used for the stitching. The needle and the needle for main sewing are provided side by side, and the upper looper and the lower looper are arranged accordingly, and the structure is naturally complicated, and it is easy to cause price increases, breakdowns, and erroneous operations. There is a drawback that the maintenance work becomes difficult, and, as represented by Patent Document 1 (2), an overlock sewing machine having both an edge stitching function and a zigzag stitching function is also A plurality of needles are provided side by side, and the structure is complicated and the cost is increased. On the other hand, the sewing unit of Patent Document 1 (3) is detachably connected. Therefore, when it is possible to sew with a plurality of types of stitches, it is necessary to proceed with the sewing work step by step while changing the various sewing units. There was a drawback that the number of work steps increased with each recombination.
(1) JP-A-8-24451 (2) JP-A 2001-340675 (3) JP-A-9-84975

(Awareness of problems)
As described above, there are a number of overlock sewing machines that can form a main stitch and a staggered seam in parallel in the same process as the previously proposed edge stitches. The needle of the book must be attached, leaving the problem of increasing the price due to the complexity of the structure and increasing the sewing cost, and has been flexible for various users for many years. In order to cope with the development and production of high-quality clothing and miscellaneous sewing products, we continue to provide them. Can be easily changed and adjusted to improve the design of the edge stitching seam, to make it possible to form a false seam in the same process as the edge stitching, and to Structure itself to simplify every configuration which is adapted to be provided at low cost, it has been led to keenly the possibility of further improvement.

(Object of invention)
Therefore, the present invention enables even a lock sewing machine having a needle swing mechanism with a single needle to easily adjust the edge width of the edge stitching seam, and is excellent in aesthetics by reliably preventing jumping. Judging from the new lock sewing technology that can realize a variety of shell lock seams and whether it is possible to develop a sewing product using the same, we started its development and research quickly, trial and error over many years, and many trial productions As a result of repeating the experiment, this time, the needle lowering device for the lock sewing machine with the new structure, the needle plate for the lock sewing machine with the new structure, and the new structure manufactured using the lock sewing machine incorporating them are finally shown. The present invention has succeeded in realizing a sewn product, and the configuration thereof will be described in detail below together with an embodiment representing the present invention shown in the drawings.

(Structure of the invention)
As clearly understood from the embodiments representing the present invention shown in the drawings, the needle lowering device for a lock sewing machine of the present invention basically includes the following configuration.
That is, a needle bar that can move up and down along the sewing machine body guide is provided, and the middle part between the upper and lower ends of the lowering lever is pivoted to the right or left of the needle bar at a predetermined distance. The base end of the needle bar moving arm is pivotably pivoted to the pivot, and the base end of the auxiliary arm is pivotally pivoted to the lower end of the lowering lever. The tip of the moving arm is pivotally attached to the upper back of the needle bar lowering base and the tip of the auxiliary arm is pivotally attached to the lower back of the needle bar lowering base, respectively, and is opposite to the back of the needle bar lowering base. The base end of the connecting plate is pivotally attached to the front surface that is the side of the glue, and the tip of the connecting plate is pivotally attached to the middle of the needle bar. The needle swing mechanism is connected to the upper end of the lowering lever. When tilted, the amount of descent of the needle bar increases, and the needle swing mechanism moves the upper end of the descent lever opposite to the needle bar. When crocodile inclined, a needle dropping device for sewing machine according to the gist of the structure was made as as drop adjustable to reduce the amount of drop in the needle bar.

(Related invention 1)
In relation to the above-described lock sewing machine needle lowering device, the present invention includes a lock sewing machine needle plate that can be incorporated in the lock sewing machine having the needle swinging mechanism together with the lock sewing machine needle lowering device.
That is, the width of the needle is determined by the lateral width dimension, the needle drop groove formed adjacent to the claw portion that determines the thread tightening by the longitudinal length dimension is a left-right inverted L shape, and the left and right long dimension of the bottom of the needle drop groove is the needle. A needle plate for a lock sewing machine having a configuration that is set to a swing width dimension.

(Related invention 2)
The present invention relates to the needle lowering device for lock sewing machine and the needle lowering device for lock sewing machine of the present invention, and the present invention relates to the needle lowering device for lock sewing machine and the needle swing mechanism incorporating the needle lowering device for lock sewing machine. The sewing product manufactured with the lock sewing machine which has this is also included, The structure is as follows.
That is, the lock lock sewing machine needle lowering device according to the present invention and the lock sewing machine having a needle swinging mechanism incorporating the lock sewing machine needle plate are used, and the shell lock is locked every time one or a plurality of stitches of the shell lock stitch forming the overlock stitch. A lock sewing machine needle lowering device and a needle incorporating a lock sewing machine needle plate, the gist of which is a structure in which continuous stitching is performed so that the width of one or a plurality of stitches is enlarged. This is a sewn product by a lock sewing machine having a swing mechanism.

    When this sewing product is shown in different expressions, the lock sewing machine needle lowering device of the present invention and the lock sewing machine having a needle swing mechanism incorporating the lock sewing machine needle plate are used, and the shell lock seam corresponding to the overlock stitching is used. For each one or more stitches, the first overlock width of the shell lock seam is expanded, and the needle thread seam of the shell lock seam with the expanded overburden is also used as a lace stitch, and the overlock stitch and the sew stitch are substantially Can be said to be a sewing product using a lock sewing machine having a needle lowering device for a lock sewing machine and a needle swinging mechanism incorporating a needle plate for the lock sewing machine. it can.

    As described above, according to the needle lowering device for a lock sewing machine of the present invention, unlike the conventional configuration, it has a unique characteristic configuration as described above. When sewing while changing the width of the rim, it is possible to automatically and appropriately adjust the deficiency of the needle bar lowering amount that causes jumping. However, since it is a mechanical type that eliminates these harmful effects, can achieve a very good product rate, and is interlocked with the needle swing mechanism, it is significantly higher than that by electronic control. It can be manufactured at low cost, has no malfunction, has excellent durability, is excellent in maintainability and is economical.

    In addition, according to the needle plate for the lock sewing machine of the present invention, the claw portion determines the overhang width by its left and right width dimension, determines the thread tightening by the front and rear long dimension, and the left and right inverted L-shaped needle drop groove The length of the bottom left and right sides is set as the needle swing width dimension, and it is possible to sew smoothly and stably while changing the edge overhang width, and the operation of the lock lowering device for the lock sewing machine of the present invention is stabilized, and sewing is performed. This will greatly improve the yield rate of goods.

    And, the sewn product of the present invention makes the shape of the shell lock seam that forms overlock stitching, which is completely new and excellent in aesthetics not seen in the past, and can be clearly differentiated from other products, Furthermore, the shape of the shell lock seam can also be changed by changing the number of stitches that change the overhang width, etc., realizing a wide variety of unique product development, and compared to conventional products. Thus, it has a great feature that it can greatly reduce the number of manufacturing steps and the production cost.

    Further, the sewn product included in the present invention is that the first overlock width of the shell lock seam is enlarged, and the needle thread seam of the shell lock seam with the enlarged overlock width doubles as a garment stitch. Overlock stitching and festival stitching can be performed continuously so that they can be completed in a single sewing process, and the aesthetics of the shell lock seam equivalent to overlock stitching can be greatly enhanced, and the process of false stitching Is not required, and it is possible to greatly reduce the number of sewing steps and greatly reduce the production cost.

In implementing the present invention having the above-described configuration, the best or desirable mode will be described.
The lock sewing machine needle lowering device automatically adjusts the needle bar lowering amount according to the operation of the lock sewing machine's needle swing mechanism, stabilizes the seam, and has the function of reliably preventing the occurrence of skipping. When the needle swing mechanism or its interlocking mechanism tilts the upper end of the lowering lever toward the needle bar, the amount of lowering of the needle bar increases, and the needle swinging mechanism or the interlocking mechanism increases the upper end of the lowering lever to the needle bar. When the needle is tilted on the opposite side, the amount of descent must be adjustable so as to reduce the amount of descent of the needle bar.

    The needle bar of the lock sewing machine needle lowering device can be detachably mounted with one or more needles, and the amount of needle drop can be automatically adjusted according to the operation of the lock sewing machine needle lowering device. The lowering lever receives the input from the needle swinging mechanism or its interlocking mechanism, and the needle bar moving arm and auxiliary The arm has a function to transmit a desired operating force in a predetermined direction, and the right and left sides of the lower end of the lowering lever are pivoted to the right and left sides of the needle bar at the appropriate position on the sewing machine body. The base end of the needle bar moving arm is pivotally attached to the pivot shaft, and the base end of the auxiliary arm is pivotally pivotally attached to the lower end of the lowering lever. There must be.

    The needle bar moving arm and auxiliary arm receive the input from the lowering lever and have the function of transmitting the desired operating force to the needle bar lowering base in the specified direction. The base end of the needle bar moving arm is pivotably attached, and the base end of the auxiliary arm is pivotally attached to the lower end of the lowering lever, while the tip of the needle bar moving arm is attached to the needle bar lowering base. The tip of the auxiliary arm must be pivotally attached to the lower back of the needle bar lowering base, and the needle bar lowering base must be attached to the needle bar moving arm and auxiliary arm. The connection plate is responsible for transmitting the operating force to the connection plate. The connection plate is responsible for giving the desired regulation to the amount of needle bar lowering in response to input from the needle bar lowering base. At the end, the front part of the needle bar lowering base is pivoted, and The tip of the connection plate to be taken as those pivotally mounted in the middle position of the needle bar.

    The needle plate for the lock sewing machine is capable of regulating the overhang width and thread tightening, and can guide the needle drop of the needle swing function, and can perform stable sewing even when the edge overhang width is changed. The claw part of the lock sewing machine throat plate functions to regulate the overhang width and thread tightening, and the tightness should be determined by the overhang width and the longitudinal length of the claw section. Needle drop groove formed adjacent to the claw part has the function of guiding the needle drop of the needle swing function and must be L-shaped in the left and right direction. The long dimension should be set to the needle swing width dimension.

The lock sewing machine needle lowering device and the lock sewing machine having a needle swinging mechanism incorporating the lock sewing machine needle plate form an edged seam with excellent design and are reliably prevented from being released. One or a plurality of stitches of shell lock stitches that form overlock stitches as shown in the embodiments to be described later, fulfilling a function that can achieve functionality and external aesthetics that cannot be obtained by sewing according to the prior art. It is possible to increase the overlock width of one or a plurality of shell lock seams every time, and the shell lock seams for every one or more perforations of the shell lock seams corresponding to the overlock seams. In addition to increasing the width of the one or more stitches, the needle thread seam of the shell lock seam with the increased width of the stitch is also used as a lace stitch. In addition to being able to perform continuous stitching so that the stitching and the stitching can be completed in a single sewing process, various stitching and stitching conditions other than those can be obtained by changing the margin width conditions of the stitching stitches. And so on.
In the following, the structure of the present invention will be described in detail together with an embodiment representative of the present invention shown in the drawings.

The drawings show several typical embodiments embodying the technical idea of a lock sewing machine needle lowering device, a lock sewing machine needle plate, and a lock sewing machine incorporating them according to the present invention. is there.
It is a front view which shows the needle | hook lowering apparatus for lock sewing machines which raised the needle bar. It is a front view which shows the needle | hook lowering apparatus for lock sewing machines which lowered | hung the needle bar. It is a top view which shows the needle plate for lock sewing machines compared with a conventional type. It is a top view which shows an auxiliary nail compared with a conventional type. It is a perspective view which shows an example of the shell lock seam of a sewn product. It is a perspective view which shows the other example of the shell lock seam of a sewn product. It is a top view which shows the change of the overburden width of a sewing product. It is a top view which shows the other change of the overlock width of a sewing product. It is a perspective view which shows the sewing process of the warp stitch which doubles as a stitching. It is a perspective view which shows the sewing product which finished sewing. It is a perspective view which shows the sewn product which sewn two sheets. It is a perspective view which shows the conventional sewing product.

    1 is a front view of the needle lowering device for a lock sewing machine shown with the needle bar raised in FIG. 1, and a front view of the needle lowering device for the lock sewing machine shown with the needle bar lowered in FIG. The lowering lever 4 is pivotally attached to one place, the needle bar moving arm 5 base end is pivotally attached to the pivot 40, and the auxiliary arm 50 base end is pivotally attached to the lower end of the lowering lever 4. Each of the 50 tips is pivotally attached to an appropriate position of the needle bar lowering base 6, and a connection plate 60 pivotally attached to the needle bar lowering base 6 is pivotally attached to the needle bar 3. FIG. 2 shows a typical embodiment of the lock sewing machine needle lowering device according to the present invention, in which the lowering amount of the needle bar 3 can be automatically adjusted according to the tilt.

As can be clearly understood from FIGS. 1 (a), 1 (c) and FIGS. 2 (b), 2 ( d) , the lock sewing machine needle lowering device 2 of the present invention can Along with a mechanism (not shown), the needle 10 can be moved up and down along the guide unit 10 which is capable of swinging the needle, and a needle bar 3 provided with a needle mounting part (not shown) and a needle set screw is incorporated at the lower end of the bar. An appropriate position between the upper and lower ends of the lowering lever 4 is pivotally attached to the appropriate position of the needle swing mechanism of the sewing machine main body 1 at a predetermined distance from either the left or right side of the needle bar 3 by the pivot 40, and the pivot 40 The base end of the needle bar moving arm 5 is pivotally attached to the lower end of the lowering lever 4, and the base end of the auxiliary arm 50 is pivotally attached to the lower end of the lowering lever 4. The tip of the auxiliary arm 50 is placed on the back of the needle bar lowering base 6 and the needle bar lowering base 6 Further, the base end of the connecting plate 60 is pivotally attached to the front part opposite to the back part of the needle bar lowering base 6, and the connecting plate 60 is pivotally attached to the lower part of the connecting part 60. As shown in FIG. 1 (c), the upper end of the lowering lever 4 is connected to a needle swinging mechanism (not shown) from the state of FIG. 1 (a). When the needle bar 3 is interlocked and tilted, the amount of lowering of the needle bar 3 is increased as shown in FIG. 2 (d), and from the state of FIG. 1 (c), FIG. As shown in FIG. 2, when the needle swing mechanism tilts the lower lever upper end 4 opposite to the needle bar 3, the lowering amount decreases so as to reduce the lowering amount of the needle bar 3 as shown in FIG. It can be adjusted automatically.

Further, the lock sewing machine needle plate 7 of the present invention shown in FIG. 3 (a) is oversized with a lateral width so that it can be clearly discriminated as compared with the conventional type shown in FIG. 3 (b). The needle drop groove 71 formed adjacent to the claw portion 70 that determines the width and determines the thread tightening with the front and rear length dimensions is a left-right inverted L-shape, and the bottom left and right length dimension of the needle drop groove 71 is the needle swing width dimension. It is supposed to be set.
The auxiliary claw 8 shown in FIG. 4 (a) is for the conventional auxiliary claw 8 having a single needle groove shown in FIG. 4 (b), and for the two needles shown in FIG. 4 (c). Unlike the conventional auxiliary claw 8 in which the groove is formed, the claw portion 80 for eliminating the needle grooves 81 and 81 and providing a stable thread tension of the upper thread is formed.

    The sewing product 9 of the present invention shown in FIGS. 5 and 6 is sewn using the lock sewing machine 1 of one needle incorporating the lock sewing machine needle lowering device 2 and the lock sewing machine needle plate 7 of the first embodiment. As shown by the needle thread A, the upper looper thread B, and the lower looper thread C in FIG. 5, the fixed number of one or more stitches of the shell lock stitches X, X,... This is one specific example of what is continuously sewn so that one or a plurality of overlock widths of the shell lock seam are enlarged.

    Further, the sewing product 9 of the present invention shown in FIG. 7 has a wave-like contour shape by combining three or more kinds of over-width dimensions between the difference F between the over-width dimension D and the over-width dimension E. Are formed by continuous stitching, and the sewing product 9 of the present invention shown in FIG. 8 has a small over-width dimension D and a large over-width dimension E. In this case, the shell lock seams X, X,..., Which are alternately arranged every three seams and have an uneven contour shape, are continuously sewn.

    Further, as shown in FIG. 9, the finished line G of the fabric W is folded in a mountain, the surface W1 is folded in a valley at the stitching position, and a plurality of shell lock stitches X, X,. For each stitch setting, the second overlock width of the shell lock seams X, X,... Is expanded, and the needle thread seams H of the shell lock seams X1, X1 with the increased overwidth are formed as valley folds on the surface W1. The lace stitching position is scooped so that it also serves as a festival seam. When the fabric W is developed as shown in the solid line arrow in FIG. 9 and FIG. 10, the edge stitches X, The sewing product 9 is obtained by continuously sewing X,..., And the stitches H, H,... In a single sewing process.

    Furthermore, as shown in FIG. 11, the edges of the two fabrics W, W are linearly stitched together at positions of a predetermined width from the edges of the two fabrics W and W, and as shown in FIG. 9 and FIG. It is also possible to obtain a sewing product 9 that is obtained by continuously sewing overlock stitches X, X,... And festival stitches H, H,.

(Operation / Effect of Example 1)
In the lock sewing machine needle lowering device 2 of the present invention, the upper end of the lowering lever 4 is interlocked with the operation of the sewing machine body 1 needle swinging mechanism (not shown) as shown by the two-dot chain line arrow in FIG. When the needle bar 3 is inclined opposite to the needle bar 3, the lowest lowering position of the needle bar 3 is automatically restricted to the lowering position small position J as shown in FIG. When the upper end of the lowering lever 4 is interlocked with the operation of the sewing machine body 1 needle swinging mechanism (not shown) and the needle bar 3 is tilted as shown in FIG. Thus, the lowest lowering position of the needle bar 3 is automatically restricted to the large lowering position K. When the needle bar 3 is at the center position by the needle swing mechanism (not shown), FIG. ) And FIG. 2 (b), and the needle bar 3 is moved in the horizontal direction by a predetermined overhang width by a needle swing mechanism (not shown). If the can work as shown in FIG. 1 (c) and FIG. 2 (d), and capable reliably prevent occurrence of a defective sewing by jump eyes.

    As shown in FIG. 3A, the lock sewing machine needle plate 7 of the present invention can determine the overhang width by the left and right width dimensions of the claw portion 70, and can determine the thread tightening by the front and rear length dimensions. The needle drop groove 71 having a left-right reversal L-shape has a needle swing width dimension set at the bottom left and right long dimension, and stable sewing even when the edge overhang width is changed within the bottom left and right long dimension range. This is advantageous in that the yield rate of sewn products can be significantly increased.

    The auxiliary claw 8 shown in FIG. 4 (a) is an obstacle of a needle (not shown) that moves left and right by the movement of the needle bar 3 accompanying the change in the over-width of the needle swing mechanism (not shown). 4 (b) and 4 (c), the concave grooves 81 and 81 in the conventional type are abolished, and the thread tension of the upper thread is stabilized by leaving the claw portion 80. It is possible to increase the yield rate of sewn products.

(Operation / Effect of Example 2)
On the other hand, the sewing product 9 included in the present invention includes a lock sewing machine needle lowering device 2 according to the present invention and a needle incorporating the lock sewing machine needle plate 7 according to the present invention, as shown in FIGS. Using a lock sewing machine 1 having a swing mechanism (not shown), a plurality of overlock widths of the shell lock seams X, X,... (Dimension E in FIGS. 7 and 8) is continuously sewn so as to be enlarged, and the stitches X and X of unique shapes that have not been seen in the past are formed on the front and back of the fabric W edge. ,... Can be formed and the aesthetics of the stitched seams X, X,.

    Further, in the sewing product 9 included in the present invention, as shown in FIGS. 9 and 10, the lock sewing machine needle lowering device 2 of the present invention and the lock sewing machine needle plate 7 of the present invention are provided. Using a lock sewing machine 1 having a built-in needle swing mechanism (not shown), the first overlock width of the shell lock seam X is set for each set of shell lock seams X, X,. The needle thread seam H of the shell lock seam X, which has been enlarged and the width of the overlock, is also used as a lace stitch, and the overlock stitches X, X,... And the lace stitches H, H,. Since it is assumed that it is continuously sewn so that it can be completed in the sewing process, until now, after performing overlock sewing, it was necessary to carry out a separate sewing process, which was then sewn into one piece. Craft It can be done at once, and the manufacturing man-hours and production costs can be greatly reduced, and the contour shape of the shell lock seams X, X, ... on the edge is unique and excellent in aesthetics. Differentiation can be achieved.

    Furthermore, as shown in FIG. 11, the sewing product 9 in which the edges of the two fabrics W, W are stitched together can also perform overlock stitching and festival stitching in the same sewing process. Man-hours and production costs can be significantly increased.

(Conclusion)
As described above, the lock sewing machine needle lowering device and the lock sewing machine needle plate of the present invention, as well as the sewn product using the lock sewing machine incorporating the lock sewing machine, can achieve the intended purpose evenly by the novel configuration. Moreover, the lock sewing machine needle lowering device and the lock sewing machine needle plate are easy to manufacture, and can be mass-produced with a simple structure at a low cost compared to a lock sewing machine having a conventional needle swing mechanism. In addition to being economical, the sewing workability can be greatly improved. So far, sewing products that could not be produced without going through multiple processes are much more efficient and high quality. The sewing industry and the sewing machine industry, which seeks to reduce labor costs and improve production efficiency, are more productive, have fewer failures, and are highly operated. The sewing machine that wants to provide a sewing machine that has a sewed edge, and a new design for edge stitches, as well as general households that want an easy-to-handle and inexpensive sewing machine, are widely used, It is expected to become popular.

1 Sewing machine
10 Same guide part 2 Needle lowering device for lock sewing machine 3 Needle bar 4 Lowering lever
40 Axis 5 Needle bar moving arm
50 Same auxiliary arm 6 Needle bar lowering base
60 Same connecting plate 7 Needle plate for lock sewing machine
70 Same nail
71 Needle drop groove 8 Auxiliary claw
80 Same nail
81 Groove for the same needle 9 Sewing product A Needle thread B Upper looper thread C Lower looper thread D Overhang width small dimension E Overlock width large dimension F Dimensional difference G Finished line H Needle thread seam J Descent amount small position K Descent amount large position W Fabric
W1 Same fabric surface X Edge over stitching Y Sewing Z Festival stitch

Claims (4)

A needle bar that can move up and down is provided along the sewing machine body guide, and the middle part between the upper and lower ends of the lowering lever can be pivoted to the right and left sides at a predetermined distance on either side of the needle bar. The base end of the needle bar moving arm is pivotably attached to the pivot, and the base end of the auxiliary arm is pivotally pivoted to the lower end of the lowering lever. The tip of the needle bar is mounted on the back of the needle bar lowering base and the tip of the auxiliary arm is pivotally mounted on the lower part of the needle bar lowering base so that it can swing left and right. When the base end of the connecting plate is pivotally attached to the front surface, and the tip of the connecting plate is pivotally attached to the middle of the needle bar, the needle swing mechanism tilts the upper end of the lowering lever to the side of the needle bar. , Increase the needle bar lowering amount, and the needle swing mechanism will move the upper end of the lowering lever to the opposite side of the needle bar. When oblique, sewing machine, characterized in that shall become incorporate as drop adjustable and the needle dropping apparatus to reduce the amount of drop in the needle bar. The needle drop groove that is formed adjacent to the claw that determines the tightness by the front and rear long dimensions is determined by the left and right width dimensions, and the left and right long dimension of the bottom side of the needle drop groove is the needle swing width. The lock sewing machine according to claim 1, wherein a lock sewing machine needle plate set to have dimensions is incorporated . Using the lock sewing machine according to any one of claims 1 and 2, for each one or more stitches of the shell lock seam corresponding to the overlock stitch, the first overlock width of the shell lock seam is increased and the overlock A sewing method characterized in that the needle thread seam of the shell lock seam having an enlarged width also serves as a lace stitch, and is continuously sewed so that the over stitching and the lace stitch are substantially completed in one sewing process . A sewing product that is sewn by the sewing method according to claim 3 .

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