TWI414659B - And a sewing machine having an upper decorative sewing mechanism - Google Patents

Abstract

At the vicinity of the front end part of the upper decorative rib curved needle when the upper decorative rib curved needle moves backwards from the position of advancing end to the vicinity of the retreating end in company with the beginning of the tailoring, the upper decorative rib part which is openly arranged between the upper decorative rib disconnecting device and the upper decorative rib guiding piece is pressed downwards by the line upper compressing piece that is integratedly extending-arranged at the lower end part of the upper decorative rib guide, thereby the hitching holding of the upper decorative rib curved needle to the upper decorative rib in the tailoring action of the first stitch, and is irrelevant with the state of the cutting end of the needlework and the kind of the used needlework, and the preset stitch seam can be formed credibly and favorably from the first stitch.

Description

Sewing machine with upper decorative seam mechanism

The present invention is applicable to a sewing machine having an upper decorative stitch mechanism in which stitches are formed by a plurality of needle threads, a thread hook line, and an upper decorative thread, for example, a multi-needle flat seam sewing machine of three needles.

In the prior art, for example, Japanese Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. Many cases, that is, have: a plurality of pins, juxtaposed in a direction crossing the feeding direction and arranged to reciprocate up and down; a pressing member; an upper decorative wire guide fixedly supported on the arm and the upper decorative line The upper side is guided toward the stitch forming region under the pressing member; the upper decorative wire hook has a hooking portion hooking the upper decorative line portion between the upper decorative wire guide and the pressing member, and is provided In order to move in and out along the parallel direction of the plurality of pins, the movement is freely movable so that the hook is attached to the upper side of the hook line to the direction of the feeding direction; and the upper decorative line cutting device is at the end of the sewing. The needle reaches a top dead center or a vicinity thereof, and is tensioned between the hook line portion of the upper decorative wire hook and the upper decorative wire guide in a state where the upper decorative wire hook is moved to the entry and exit end. Above Rear trim line portion is hooked, pulling upward and rearward obliquely cut, and, holding the wire ends are cut on the side of the decorative lines.

According to the sewing machine including the upper side decorative seam mechanism of the above-described constituent member, the upper decorative thread is transmitted through the upper decorative line guide from the stitch forming region under the pressing member to the right oblique direction during the normal sewing operation. The upper part is moved in and out by the hook line of the upper side of the hook line, and is pulled to the left by the hook line of the line hook. When the line hook reaches the entrance and exit end, the needle of the left side of the plurality of stitches is lowered and moved to the left side. In the upper decorative wire coil (formed between the hook wire portion and the upper decorative wire guide), and the needle at the right end of the parallel direction is lowered and moved to the near side of the upper decorative wire coil, and the wire hook is retracted thereafter When the movement is moved, the upper side decorative line is released from the hook line portion, and the needle thread forming region under the pressing member is pressed by the right end needle thread supplied to the right end needle, and is sewn on the cloth to form a predetermined stitch.

However, the conventional sewing machine having the upper decorative sewing mechanism proposed in each of the above-mentioned patent publications is based on the premise that the upper decorative thread is hooked to the hook line when the upper decorative thread hook is moved in and out. To the left, when the hook of the hook reaches the entrance and exit end, the upper side trim loop is formed between the hook line portion and the upper trim line guide by the positive and stable stitches, and the upper side decoration is released from the hook line portion of the hook. The thread is pressed by the needle thread at the right end under the stitch forming region under the pressing member, so that the predetermined stitch can be formed continuously and surely, in other words, the sewing operation can be normally performed from the sewing operation of the first stitch. In the case of the sewing of the current cloth, the initial stitch forming operation (hereinafter referred to as the first stitch sewing operation) at the time of starting the sewing of the next cloth is completely ignored.

In other words, the case where the upper decorative thread is not reliably hooked to the hook portion of the upper decorative thread hook is not taken into consideration in the sewing operation of the first stitch. Therefore, when the upper decorative thread is not hooked to the hook line portion of the upper decorative thread hook during the sewing operation of the first stitch, the predetermined stitch of the upper decorative thread to the needle thread is not formed, and the so-called jump occurs. In addition to the first stitch, the thread does not form a predetermined stitch during the sewing operation after the second stitch, and as a result, there is a possibility that a defective product is produced.

In the conventional sewing machine having the upper decorative sewing mechanism, the reason why the jumper cannot be formed by forming the predetermined stitch by the sewing operation of the first stitch, and the explanation of the main part will be described in detail below.

That is, when the sewing of the sewing operation of the preceding cloth is completed, as shown in Fig. 7(A), the upper decorative line 3 portion (the hook line portion 1a spanning the upper decorative wire hook 1 and the fixed support to the arm ( Illustrated in the drawing, the line guide long holes 2a of the upper side decorative wire guide 2 are tightened by the movable blade 4a of the upper decorative wire cutting device 4, and are pulled obliquely rearward and upward, and are cut. The line end of the cut-off upper side decorative wire 3 is held, and is supplied to a plurality of needles 6L, 5M, 5R (which are arranged in a direction crossing the feeding direction) 6R is cut under the pressing member by a well-known wire cutting device (not shown), and the end portions 61, 6m, and 6r of the needles 6L, 6M, and 6R after the cutting are moved to the needles 5L and 5M, as the case may be. Above the side of the 5R, so that the end portions 6l, 6m, 6r are not removed from the pressing member hole by a needle scraper (wiper, as explained hereinafter) which moves slightly along the upper surface of the pressing member, thereby hindering the next cloth. insert. At this time, the relationship between the needle thread 6R inserted into the pinhole of the right end needle 5R and the upper decorative line 3 among the parallel stitches 5L, 5M, and 5R is as shown in Fig. 9(A), and the end portion 6r of the right end needle thread 6R is made. The state of the free end is located behind the upper decorative line 3, that is, after the transfer direction X of the cloth 20.

When the sewing machine is operated in this state and the sewing of the next cloth 20 is started, as shown in Fig. 7(B), the upper decorative thread hook 1 is retracted from the position at the entrance and exit end thereof, and is attached to the upper side of the needle fixing member 7. The decorative lane 8 moves downward in synchronization with the needles 5L, 5M, and 5R, and then, as shown in Fig. 7(C), the upper decorative thread hook 1 reaches the retracted end and enters and exits in the direction of the needles 5L, 5M, and 5R. After the movement, the needles 5L, 5M, 5R and the upper decorative lane 8 reach their bottom dead center and then move upward. At this time, the end portions 61, 6m, and 6r of the needle threads 6L, 6M, and 6R (cut under the presser member or moved to the side of the needles 5L, 5M, and 5R after being cut) are located in the presser member. The upper side is in a free state without tension, so as shown in Fig. 9(B), the free ends 6l, 6m, 6r of the moving needles 6L, 6M, 6R are pulled to the upper decorative line with the lowering of the needles 5L, 5M, 5R. 3 under the tension position.

Next, when the upper decorative thread hook 1 is moved in and out, there is no problem if the hook line 1a can be hooked on the upper decorative line 3, but actually, the needles 5L, 5M, 5R and the upper decorative thread hook 1 The relationship of the timing of the action (set such that it can form a good stitch), the upper decorative lane 8 has risen before the hook portion 1a hooks the portion of the upper decorative line 3, and since the upper decorative lane 8 Ascending, the upper decorative line 3 portion is pulled slightly above the hooking line portion 1a of the upper decorative thread hook 1 as shown in Fig. 7(C), so that the upper decorative line 3 portion cannot be hooked to the upper side decoration. The hook line portion 1a of the thread hook 1 or the hook is unlikely to be hooked even if it can be hooked. When the upper decorative thread hook 1 reaches the entrance and exit end, as shown in Fig. 7(D), it cannot be An upper decorative wire loop is formed between the hook line portion 1a and the upper decorative wire guide 2, and the end portion 6r of the right end needle thread 6R is held as shown in FIG. 9(C) as the needles 5L, 5M, and 5R rise. The state of being pulled down to the lower portion of the upper decorative line 3 is captured at the end portion 6r of the needle thread 6R after the lower hook wire hook 19 3 become the front of the decorative lines on the upper side relationship. Further, in order to make the state of FIG. 7(D) clearer, the enlarged state of FIG. 7(D) is shown in FIG.

In the state shown in Fig. 8, even if the needles 5L, 5M, and 5R are lowered, the end portions 61, 6m, and 6r of the needle threads 6L, 6M, and 6R are held by the lower portion of the presser member to be attached to the cloth 20, and the upper decorative line is held. 3, while maintaining the vicinity of the end portions 6l, 6m of the needle thread 6L, 6M at the left end and the middle, and the state behind the end portion 6r of the needle thread 6R at the right end, when the next needle 5L, 5M, 5R descends, The upper decorative wire 3 cannot be partially pressed under the pressing member by the right end needle thread 6R. Therefore, although the stitches of the needle threads 6L, 6M, and 6R and the lower thread hook line can be formed, the predetermined stitches that catch the upper side decorative thread 3 cannot be formed, and not only the sewing operation of the first stitch but also the sewing operation thereafter cannot be formed. With established stitches, there will be problems with sewing defects.

In particular, even when the cut ends of the needle thread are not moved to the side above, when the needle threads 6L, 6M, and 6R having stretchability are used, the needle threads 6L, 6M, and 6R that are cut at the end of the sewing are shrunk. Since the end portions 6l, 6m, and 6r are shortened, the positional relationship between the needle threads 6L, 6M, and 6R and the upper decorative wire 3 portion is in the state shown in Figs. 7(D) and 9(C), resulting in the upper decorative line 3 It is more difficult to press down the stitch forming region under the pressing member, which causes a problem that a predetermined stitch cannot be formed at all during the first stitching and the subsequent sewing operation.

The present invention has been made in view of the above circumstances, and it is an object of the invention to provide a sewing machine having an upper decorative sewing mechanism, in which the hook of the upper decorative thread hook is securely held and stabilized during the sewing operation of the first stitch, regardless of the sewing thread at the end of sewing. The condition of the cut end and the type of the needle thread to be used can form a predetermined stitch from the first stitch.

A sewing machine having an upper decorative seam mechanism according to the first aspect of the invention of the first aspect of the present invention is provided with: a plurality of needles arranged in a direction crossing the feeding direction and arranged to reciprocate up and down a pressing member; an upper decorative wire guide fixedly supported by the arm and guiding the upper decorative line from the upper direction to the stitch forming area under the pressing member; the upper decorative thread hook having the hook on the upper decorative side a hooking portion of the upper decorative line portion between the wire guide and the pressing member, and is arranged to move in and out along the parallel direction of the plurality of pins, so as to be hooked to the upper decorative line of the hooking portion And the upper side decorative line cutting device reaches the top dead center or the vicinity thereof at the end of the sewing, and the upper decorative wire hook moves to the inlet and outlet ends, and The hook line portion spanning the upper decorative wire hook and the upper decorative wire guide are hooked by the upper side decorative line portion, and then pulled obliquely to the upper rear side and cut, and the cut upper side is maintained Decorative line a wire end; the upper side decorative wire hooking auxiliary mechanism is provided when the upper decorative wire hook is retracted from the entry and exit position to start near the retreating end with the sewing start, and the upper decorative line is The portion is pressed downward so that the upper decorative line portion spanning between the upper decorative line cutting device and the upper decorative wire guide is hooked to the hook portion of the upper decorative wire hook.

Moreover, the sewing machine having the upper decorative seam mechanism of the present invention of the second aspect of the patent application scope of the present invention has a plurality of needles arranged in a direction intersecting the feeding direction and is provided The upper and lower reciprocating movements are free; the upper fabric guide is fixedly supported on the arm and guides the upper decorative line from the upper direction to the stitch forming area under the pressing member; the upper decorative thread hook has a hook a hook line portion located on the upper decorative line portion between the upper decorative wire guide and the pressing member, and is arranged to move in and out along the parallel direction of the plurality of pins, so as to be hooked to the hook portion The upper side decorative line is drawn out to the direction of the feeding direction; and the upper decorative line cutting device reaches the top dead center or the vicinity thereof at the end of the sewing, and the upper decorative wire hook moves to the inlet and outlet ends a state in which the hook line portion of the upper decorative wire hook and the upper decorative wire guide are hooked by the upper side decorative line portion, and then pulled obliquely to the upper rear side and cut, and the holder is kept Cut off a wire end of the side decorative line; characterized in that: in the vicinity of the front end portion of the upper decorative wire hook, a hook portion is provided opposite to the hook wire portion to form a wire entrance and exit, and the hook wire can be attached to the upper side When the sewing starts to retreat from the entry and exit position to reach the vicinity of the retracting end, hooking the upper decorative line portion that is hooked between the upper decorative line cutting device and the upper decorative wire guide; The upper decorative line pressing mechanism is synchronized with the downward movement of the needle to press the upper decorative line portion between the upper decorative wire hook cutting device and the upper decorative wire guide to be pressed downward It is assisted to hook to the hook portion near the front end portion of the upper decorative wire hook.

According to the first and second inventions having the above-described features, the upper decorative line portion is hooked and held between the hook line portion (moved to the entrance and exit end) of the upper decorative thread hook and the upper decorative line cutting device. When the sewing is completed, the sewing operation of the first stitch of the next cloth is started, and when the upper decorative thread hook is retracted from the entry and exit position and reaches the vicinity of the retracted end, the upper decorative line hooking auxiliary mechanism or The upper decorative wire pressing mechanism presses the upper decorative wire portion downward, so that it can reliably and stably hook the hook line portion or the hook portion of the upper decorative wire hook. Thereby, in the state in which the upper decorative wire hook reaches the entry and exit end next time, the upper side decorative line portion between the hook line portion or the hook portion and the upper side decorative line cutting device is formed with a right end needle as a bend. The curved portion of the center is such that the curved line portion is located in front of the cut end of the needle thread. Therefore, even if the end portion of the needle thread is cut under the pressing member at the end of the sewing, or the needle end portion which is moved to the side of the needle after the cutting is in a free state, even if the needle thread is used for the expansion and contraction The end portion of the needle thread after cutting is made very short, and the bending line portion of the upper decorative line can be reliably pressed under the pressing member by the needle and the needle thread at the right end when the needle is moved downward, and the needle can be removed from the first needle. The action does form an established stitch that the upper side trim line, the needle thread, and the lower line hook line hold each other. In addition, as described above, the upper decorative thread can be pressed under the pressing member by the first stitch, and it is a matter of course that a predetermined stitch can be surely formed after the second stitch, and the effect of eliminating the occurrence of the sewing defective product can be exhibited.

In the sewing machine of the sewing machine having the upper decorative sewing mechanism according to the first aspect of the present invention, the upper decorative wire hooking assisting mechanism is configured to press the upper decorative wire portion downward in synchronization with the downward movement of the needle, for example, by the line pressing. In the sheet structure, the line pressing piece is integrally extended downward from the upper decorative line which is mounted on the needle fixing member and reciprocally moved up and down. When the upper decorative line reaches the moving end below, the line can be inserted from the top to the bottom. Moving in the long hole for guiding the wire of the upper decorative wire guide, pressing the upper decorative wire portion downward to hook the hook portion of the upper decorative wire hook (No. 3 of the patent application), or The wire pressing member is attached to the side of the needle fixing member and protrudes downward. When the needle and the needle fixing member reach the moving end below, the upper side can be abutted. Decorating the wire portion and pressing the upper decorative wire portion downward to hook the hook portion of the upper decorative wire hook (No. 5 of the patent application), the upper decorative wire hooking auxiliary mechanism is not required to be used up and down Special mobility The drive mechanism can be configured to be simple and inexpensive, and can also appropriately set and maintain the timing of the hook with the needle or the upper decorative thread, and can achieve the intended purpose even after long-term use.

Further, the upper side decorative line pressing mechanism of the sewing machine having the upper decorative sewing mechanism of the second invention of the second invention provided with the hook portion in the vicinity of the front end portion of the upper decorative thread hook is capable of being pressed downward. The wire is pressed down, and the wire pressing piece is integrally extended downward from the upper decorative line which is mounted on the needle fixing member to reciprocate upward and downward, and when the upper decorative line reaches the moving end below, Inserting into the long hole for guiding the wire of the upper decorative wire guide in the downward direction to press the upper decorative wire portion downward to assist the hook portion hooked to the front end portion of the upper decorative wire hook (patent application) In the fourth item), the upper decorative line pressing mechanism is constituted by a linear pressing member attached to the side of the needle fixing member and protruding downward, when the needle and the needle fixing member reach downward When the vicinity of the moving end, the upper decorative line portion can be abutted against the upper decorative line portion to be pressed downward to assist the hook portion in the vicinity of the front end portion of the upper decorative wire hook (Japanese Patent Application No. 6) Item) In addition, a special driving mechanism for moving the upper decorative wire pressing mechanism up and down is not required, and the entire structure can be made simple and inexpensive, and the action of hooking with the needle or the upper decorative thread can be appropriately set and maintained. Timing, even if used for a long time can still achieve the purpose of the period.

Further, the upper decorative wire hooking assisting mechanism or the upper decorative wire pressing mechanism may be configured such that the upper decorative wire cutting device itself is moved downward to press the upper decorative wire portion downward to hook the upper decorative portion. The hook portion of the wire hook, or the hook portion of the hook near the front end of the upper decorative wire hook.

Other configurations and effects will be apparent from the following description of the embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing a whole of a three-needle vertical tube flat sewing machine of an example of a sewing machine having an upper decorative sewing mechanism, Fig. 2 is an enlarged perspective view of a main portion thereof, and Fig. 3 is a view showing the configuration, operation and arrangement of main parts. Magnified perspective view. In the following description, members that are the same as those described in FIGS. 7(A) to (D) and FIGS. 9(A) to (C) are denoted by the same reference numerals.

In FIGS. 1 to 3, the 5L, 5M, and 5R series 3 needles are mounted side by side in the direction intersecting the feeding direction X through the needle fixing member 7 to the needle bar 10 (coupling with the sewing machine main shaft provided in the arm 9 ( The lower end portions of the lower and lower reciprocating movements are omitted, and the needle threads 6L, 6M, and 6R are supplied, respectively. 11-series cylindrical column, on which the needle plate 12 is fixed, and a sewing part or mechanism is formed inside (the following line hook for hook line (refer to FIG. 9) or feeding teeth, etc. These instructions). The 13-type presser is configured to be movable through the pressure bar 14 at a lowered position (pressing the sewing cloth from the upper side to the needle plate 12) and the rising position (removing the cloth), and the three pins 5L, 5M are formed. The needle drop portion into which the 5R is inserted and the needle thread 6L, 6M, and 6R and the through hole 13a of the thread passing portion through which the upper decorative wire 3 passes.

2 is fixedly supported by the arm 9 and extended to the lower upper side decorative wire guide, and at the lower end portion thereof, as shown in FIG. 3, a wire guiding long hole 2a is formed for substantially making the upper decorative wire 3 in the front-rear direction. The card is inserted and can be moved and guided to be sent out. The upper decorative track of the 8 series has a wire hole 8a through which the upper decorative wire 3 is inserted in the vicinity of the lower end portion thereof so as to be reciprocally movable in the vertical direction in synchronization with the needles 5L, 5M, and 5R attached to the needle fixing member 7.

At the lower end portion of the upper decorative lane 8, an upper decorative line pressing mechanism is formed, that is, the linear pressing piece 8b (the vertical guiding hole for inserting the upper decorative wire guide 2 from the upper side downward) 2a) is integrally extended downwardly, and when the downward movement of the needles 5L, 5M, and 5R is synchronized to cause the upper decorative lane 8 to reach the moving end below, the wire 8b is inserted downwardly from above by the wire The inside of the wire guiding long hole 2a of the upper decorative wire guide 2 is inserted into the wire hole 8a, and is hooked between the upper decorative wire guide 2 and the upper decorative wire cutting device 4, which will be described later. The upper part of the decorative line 3 is pressed downward. Further, the line guiding long hole 2a of the upper decorative wire guide 2 is enlarged so that the wire pressing piece 8b can be inserted and moved up and down.

1 is an upper decorative wire hook, the base end portion of which is fixed to the holder 16 fixed to the longitudinal axis 15, and the lower portion is bent substantially in the horizontal plane and curved in front of the 3 needles 5L, 5M, 5R. The arc shape is interlocked and moved back and forth on the needle bar 10 to move in and out along the arc-shaped path of the front surface of the three pins 5L, 5M, and 5R. On the upper side of the vicinity of the front end portion of the upper decorative wire hook 1, as shown in FIG. 3, a hook portion 1a is formed, that is, it will be located across the upper decorative wire guide 2 and the pressing cloth during the normal sewing operation. The upper side decorative line 3 of the oblique portion between the stitch forming regions at the lower portion of the piece 13 is hooked and pulled out to the left position of the left end needle 5L of the three pins 5L, 5M, 5R.

A hook portion 18 is provided on the upper side of the upper decorative wire hook 1 and on the front end side of the hook wire portion 1a, and the upper decorative wire hook 1 is retracted from the entry and exit position with the start of the sewing operation. When it reaches the vicinity of the retreat end, it hooks over the hooked upper side trimming line 3 between the upper side trimming wire guide 2 and the upper side trimming line cutting device 4. The hook portion 18 is composed of a rising portion 18a (standing from the upper front end of the upper decorative wire hook 1), an intermediate portion 18b (parallelly extending from the upper side of the upper decorative wire hook 1), and a lower curved portion 18c (extending downward) In the configuration, a line entrance/exit portion 18d that faces the opening of the hook line portion 1a is formed between the lower end portion of the lower curved portion 18c and the upper surface of the upper decorative wire hook 1.

Further, the upper decorative wire cutting device 4 is moved in the upper decorative wire 3 portion (the hook wire portion 1a of the upper decorative wire hook 1 that is moved to the entrance and exit end when the slit is completed) and the upper decorative wire guide The movable blade 4a and the fixed blade 4b which are tensioned between the two guide long holes 2a are formed, and the upper side decorative wire 3 portion is cut by the two blades 4a and 4b, and the cut is cut. The wire end of the upper decorative wire 3 is held by the wire end holding spring 4c and the wire holding assist spring 4d.

Next, the upper side decorative joint operation of the three-cylinder vertical tube flat sewing machine configured as described above will be described with reference to Fig. 4 .

Fig. 4(A) shows the state in which the sewing is completed at the end of the sewing operation of the preceding cloth, and the hook line portion 1a and the upper side of the upper decorative thread hook 1 are completely identical to the state shown in Fig. 7(A). The upper decorative line 3 between the wire guiding long holes 2a of the wire guide 2 is partially tensioned, and the end portions 61, 6m of the needle wires 6L, 6M, 6R which have been cut or moved to the side are cut. 6r is located in a free state behind the upper decorative line 3 portion.

When the sewing machine is operated in this state and the sewing of the next cloth is started, as shown in Fig. 4(B), the upper decorative thread hook 1 is retracted from the position of the entrance and exit, and the needles 5L, 5M, 5R and the upper side are provided. The decorative lane 8 is synchronously lowered and moved, and when it reaches the moving end, the linear pressing piece 8b is inserted into the long hole 2a for guiding the wire of the upper decorative wire guide 2 from the upper side to the lower side, thereby being inserted into the wire guide hole 2a. The wire hole 8a is pressed downward along a portion of the upper decorative wire 3 that is hooked between the upper decorative wire guide 2 and the upper decorative wire cutting device 4.

Next, as shown in FIG. 4(C), the upper decorative wire hook 1 reaches the retracted end and then moves in and out of the parallel direction of the needles 5L, 5M, 5R, and when the needles 5L, 5M, 5R and the upper decorative line After the road 8 reaches its bottom dead center, it starts to move upward, but at this time, that is, when the upper side decorative wire hook 1 reaches the retracting end, the upper side decorative line 3 partially enters the upper decorative line in a state of being pressed downward. The hook portion 18 at the front end of the hook 1 is hooked by the hook portion 18, and is sequentially pulled out in accordance with the movement of the upper side decorative thread hook 1.

Further, in the state where the upper decorative thread hook 1 reaches the entry and exit end next time, as shown in FIG. 4(D), the hook portion 18 is hooked to pull out the upper side decorative line 3 at the hook portion 18 and the upper side decoration. The portion of the upper decorative line 3 between the wire cutting devices 4 is bent rearward from the front end of the right needle 5R to form a curved portion 3a centering on the right end needle 5R, between the curved portion 3a and the hook portion 18 The upper side decorative line portion 3b is located in front of the needle thread 6R at the right end. Further, in order to make the state of FIG. 4(D) easier to understand, the state in which FIG. 4(D) is enlarged is shown in FIG. 5.

In this state, the needles 5L, 5M, and 5R are moved downward once, and the end portions 61, 6m, and 6r of the respective needle threads 6L, 6M, and 6R are connected to the cloth 20 at the lower portion of the presser member 13 and held (see FIG. 9). Then, the needles 5L, 5M, and 5R are moved downward, and the downward movement of the needles 5L, 5M, and 5R is caused by the right end needle 5R and the needle thread 6R, and the curved line portion 3a of the upper decorative thread 3 is as shown in Fig. 4(E). The stitch forming region under the pressing member 13 is reliably pressed, and the predetermined needle for winding the upper decorative thread 3, the respective needle threads 6L, 6M, and 6R and the lower thread hook line can be surely formed from the action of the first needle. trace.

When the stitching operation of the first stitch is formed into a predetermined stitch as described above, the upper decorative thread 3 is formed between the stitch forming region of the lower portion of the presser member 13 and the long guide hole 2a for guiding the upper decorative wire guide 2. In the state in which the posture is hooked to the right obliquely upward, the sewing operation after the second stitch is repeated with the movement of the upper decorative thread hook 1, and the hook portion 1a of the hook 1 is hooked to the upper decorative thread 3 The role of the left side, but indeed, smoothly formed the established stitch.

Further, although not shown in the drawings, in the movement of the upper decorative thread hook 1 from FIG. 4(D) to FIG. 4(E), the portion of the decorative line 3 hooked to the upper side of the hook portion 18 naturally comes from the hook portion 18. The line entrance and exit portion 18d is separated and released.

Therefore, even if the end portions of the needle threads 6L, 6M, and 6R are cut off at the lower portion of the presser 13 at the end of sewing, or are moved upward toward the sides of the needles 5L, 5M, and 5R after cutting, or even The needle thread ends 61, 6m, and 6r after cutting are extremely short by using the flexible needles 6L, 6M, and 6R, and are attached to the upper decorative line by the sewing operation of the first stitch of the next cloth. The function of the hook portion 18 at the front end portion of the wire hook 1 can surely hook the upper side decorative wire 3 portion to form the curved portion 3a as described above, so that the upper side decorative line portion 3b between the curved portion 3a and the hook portion 18 is located at the right end. The front side of the needle thread 6R and the upper decorative thread 3 are reliably pressed against the needle formation region under the pressing member 13, so that the decorative thread 3, the needle thread 6L, 6M, 6R and the lower thread hook line can be surely formed from the operation of the first needle. It is also possible to form a predetermined stitch after the second stitch, and it is possible to eliminate the occurrence of the defective sewing product.

Further, in the above-described embodiment, the upper decorative line pressing mechanism (the hook hole 8a inserted into the upper decorative lane 8 and being hooked between the upper decorative wire guide 2 and the upper decorative wire cutting device 4 is hooked The upper side decorative line 3 portion is pressed downward to assist the upper side decorative wire 3 to be hooked by the hook portion 18, and the wire guiding long hole 2a for inserting the upper decorative wire guide 2 from above to below is used. The inner wire pressing piece 8b is integrally formed on the lower end portion of the upper side decorative track 8. Alternatively, as shown in FIG. 6, a substantially L shape protruding downward may be attached to the left side surface of the needle fixing member 7. The line presses the member 21.

When the wire pressing member 21 is used as shown in FIG. 6, when the needles 5L, 5M, 5R and the needle fixing member 7 reach the vicinity of the moving end below, the wire pressing member 21 abuts against the upper decorative wire. The guide member 2 and the upper decorative wire cutting device 4 are hooked between the upper side decorative wires 3 and close to the line portion of the upper decorative wire cutting device 4 to assist the upper decorative wire 3 to be hooked by the hook portion 18, and Similarly to the above-described embodiment, a predetermined stitch can be surely formed from the sewing operation of the first stitch.

Further, in the above-described embodiment, the hook portion 18 is provided at the end portion of the upper decorative wire hook 1 so as to face the original hook portion 1a, and the wire pressing piece 8b or the wire pressing member 21 is provided. In the sewing operation of the first stitch, the hook portion 18 is assisted in hooking the upper decorative wire 3, but instead of the configuration, the hook portion 18 may not be provided at the front end of the upper decorative wire hook 1, and only the original hook line may be provided. The portion 1a, on the other hand, is additionally provided with a lower side decorative line hooking assisting mechanism, that is, by additionally driving up and down with the needles 5L, 5M, 5R and the needle bar 10, the upper side decoration can be spanned The wire guide 2 and the upper decorative wire cutting device 4 are hooked by the upper side decorative wire 3 to be pressed downward so as to be hooked to the hook wire portion 1a of the upper decorative wire hook 1.

Further, the upper decorative wire hooking assisting mechanism can move the upper decorative wire cutting device 4 downward as shown in the above embodiment, and the upper decorative wire 3 can be pressed downward so that it can be hooked. The hook line portion 1a of the hook 1 of the upper side is decorated. In other words, the upper decorative wire cutting device 4 may be configured to be movable up and down so as to be used as the upper decorative wire hooking assisting mechanism.

However, in order to provide the above-described upper side decorative thread hooking assisting mechanism or the upper side trimming line cutting device 4 as the upper side decorative thread hooking assisting mechanism, it is necessary to press the upper decorative wire lowering mechanism, for example, a pneumatic cylinder or the like. Or the special drive mechanism for moving the upper decorative wire cutting device 4 up and down, and it is necessary to appropriately set the operation timings of the needles 5L, 5M, 5R or the upper decorative wire hook 1 and the like, and it is necessary to periodically adjust and maintain, so that the setting timing is often generated. Abnormal. From this point of view, the configuration shown in each of the above embodiments is preferable in terms of structure, cost, and even maintenance.

Further, in the above embodiment, the present invention is applied to a three-cylinder vertical flat sewing machine, but the present invention is not limited thereto, and can be applied to a flat front type flat sewing machine or a cylindrical front type flat sewing machine.

1. . . Upper decorative thread hook

1a. . . Hook line

2. . . Upper decorative wire guide

2a. . . Long hole for wire guiding

3. . . Upper decorative line

3a. . . Curved part

3b. . . Upper decorative line section

4. . . Upper decorative line cutting device

4a. . . Movable knife

4b. . . Fixed knife

4c. . . Wire end retaining spring

4d. . . Wire retention auxiliary spring

5L, 5M, 5R. . . needle

6L, 6M, 6R. . . sewing

6l, 6m, 6r. . . Needle end

7. . . Needle fixing

8. . . Upper decorative line

8a. . . Line hole

8b. . . Line press

9. . . Arm

10. . . Needle bar

11. . . Cylinder head

12. . . Needle plate

13. . . Pressing piece

13a. . . Through hole

14. . . Pressure bar

15. . . Vertical axis

16. . . Clamp

18. . . Hook

18a. . . Erect

18b. . . Middle part

18c. . . Bend

18d. . . Line entrance and exit

19. . . Lower hook line hook

20. . . cloth

twenty one. . . Line pressing member

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing a whole of a three-cylinder longitudinal flat-slit sewing machine which is an example of a sewing machine having an upper decorative sewing mechanism according to the present invention.

Fig. 2 is an enlarged perspective view of the main part of the sewing machine.

Fig. 3 is an enlarged perspective view showing the configuration, operation, and arrangement of the main parts of the sewing machine.

4(A) to 4(E) are explanatory views of main parts of the upper side decorative sewing operation of the first stitch.

Fig. 5 is an enlarged view showing the state of Fig. 4(D).

Fig. 6 is an enlarged view showing a main part of another embodiment of the sewing machine having the upper decorative seam mechanism of the present invention.

7(A) to 7(D) are explanatory views of the main part of the upper side decorative sewing operation of the first needle of the sewing machine having the upper decorative sewing mechanism.

Fig. 8 is an enlarged view showing the state of Fig. 7(D).

9(A) to 9(C) are explanatory views showing the positional relationship between the upper decorative line and the needle thread.

1. . . Upper decorative thread hook

1a. . . Hook line

2. . . Upper decorative wire guide

2a. . . Long hole for wire guiding

3. . . Upper decorative line

3a. . . Curved part

3b. . . Upper decorative line section

4. . . Upper decorative line cutting device

4a. . . Movable knife

4b. . . Fixed knife

4c. . . Wire end retaining spring

4d. . . Wire retention auxiliary spring

5L, 5M, 5R. . . needle

6L, 6M, 6R. . . sewing

6l, 6m, 6r. . . Needle end

18. . . Hook

Claims (8)

The sewing machine with the upper decorative sewing mechanism has a plurality of needles arranged in a direction crossing the feeding direction and arranged to reciprocate up and down; the pressing member; the upper decorative wire guide is fixedly supported on the arm and Leading the upper decorative line from the upper direction to the stitch forming area under the pressing member; the upper decorative thread hook having hooks hooking the upper decorative line portion between the upper decorative line guide and the pressing member a line portion, and is arranged to move in and out along the parallel direction of the plurality of needles, so that the hook is attached to the upper side of the hook line in a direction crossing the feeding direction; and the upper decorative line is cut a breaking device, the needle of the plurality of needles reaching the top dead center or the vicinity thereof at the end of the sewing, and the hook line portion crossing the upper decorative wire hook and the state of the upper side decorative wire hook moving to the entry and exit end After the upper side decorative wire guide is hooked by the upper side decorative line portion, the upper side of the decorative line is pulled obliquely upward and cut, and the line end of the upper side decorative line is kept; and the upper side is provided Decorative line hook The auxiliary mechanism is configured to press the upper decorative line portion downward when the upper decorative thread hook is retracted from the position of the entrance and exit to the vicinity of the retracting end, so as to be cut across the upper decorative line. The upper decorative line portion between the device and the upper decorative wire guide is hooked to the hook line portion of the upper decorative wire hook. The sewing machine with the upper decorative sewing mechanism has a plurality of needles arranged in a direction crossing the feeding direction and arranged to reciprocate up and down; the pressing member; the upper decorative wire guide is fixedly supported on the arm and Leading the upper decorative line from the upper direction to the stitch forming area under the pressing member; the upper decorative thread hook having the hooking on the upper decorative line guide and the pressing member The hook line portion of the upper side decorative line portion is arranged to move in and out along the parallel direction of the plurality of needles, so that the hook is attached to the upper side of the hook line portion and the decorative line is crossed to the feeding direction. And a direction of the upper decorative line cutting device, the plurality of needles reaching the top dead center or the vicinity thereof at the end of the sewing, and the state in which the upper decorative wire hook is moved to the entry and exit end, the upper side decoration is crossed After the hook line portion of the wire hook and the upper decorative wire guide are hooked by the upper decorative line portion, the wire is pulled obliquely upward and cut upward, and the line of the upper decorative line is cut. The end portion is provided with a hook portion adjacent to the front end portion of the upper side decorative wire hook and opposite to the hook line portion to form a line entrance and exit, wherein the upper side decorative thread hook can be started with the sewing When the entry and exit position is retracted and moved to the vicinity of the retracted end, the upper decorative line portion that is hooked between the upper decorative line cutting device and the upper decorative wire guide is hooked; and the upper decorative line is pressed Institution, which is synchronized with the complex The downward movement of the needle is pressed across the upper side decorative line portion between the upper decorative wire hook cutting device and the upper decorative wire guide to assist the hook to the upper decorative line. Hook near the front end of the hook. A sewing machine having an upper decorative stitching mechanism according to the first aspect of the invention, wherein the upper decorative thread hooking auxiliary mechanism is constituted by a linear pressing piece which is mounted on the needle fixing member and reciprocated up and down. The upper side decorative line extends integrally downward, and when the upper decorative line reaches the moving end below, the upper decorative line can be inserted into the long hole for guiding the upper decorative line guide from the upper side to the lower side. The upper decorative line portion is pressed downward to be hooked to the hook line portion of the upper decorative wire hook. A sewing machine having an upper decorative stitching mechanism according to claim 2, wherein the upper decorative thread pressing mechanism is constituted by a linear pressing piece which is reciprocated up and down from the needle fixing member. The upper decorative lane extends integrally downward, and when the upper decorative lane reaches the moving end downward, the upper guiding wire can be inserted into the long hole for guiding the upper decorative wire guide from the upper side to the lower side to The upper decorative line portion is pressed downward to assist the hook portion hooked to the hook portion near the front end portion of the upper decorative wire hook. A sewing machine having an upper decorative seam mechanism according to the first aspect of the invention, wherein the upper decorative thread hook hooking auxiliary mechanism is constituted by a wire pressing member attached to a side portion of the needle fixing member The lower side protrudes, and when the needle and the needle fixing member reach the moving end toward the lower side, the upper side decorative line portion can be abutted against the upper side decorative line portion to be pressed downward to hook the hook line portion of the upper decorative wire hook. A sewing machine having an upper decorative stitching mechanism according to claim 2, wherein the upper decorative thread pressing mechanism is constituted by a wire pressing member attached to a side portion of the needle fixing member to protrude downward When the needle and the needle fixing member reach the vicinity of the moving end below, the upper decorative line portion can be abutted against the upper decorative line portion to press downward to assist the hook to the front end of the upper decorative thread hook. Hooks nearby. A sewing machine having an upper decorative stitching mechanism according to the first aspect of the invention, wherein the upper decorative thread hooking assisting mechanism is capable of pressing the upper decorative wire portion downward by the upper decorative wire cutting device itself Below, the hook line portion hooked to the upper decorative wire hook. A sewing machine having an upper decorative stitching mechanism according to the second aspect of the invention, wherein the upper decorative thread pressing mechanism can move the upper decorative wire portion downward by the upper decorative wire cutting device itself moving downward To assist in hooking the hook portion near the front end of the upper decorative wire hook.