CN100460581C - Thread rewinding device for sewing machine - Google Patents

Abstract

A thread rewinding device of a sewing machine, which can select the first suture path (R1) from the thread shaft (5) to the needle (9) through the swing thread take-up lever (14), the needle bar thread take-up lever (16) and the thread rewinding path (R1) from the thread spool (5) Pass through the swing thread take-up lever (14) to reach the (2) suture path (R2) of the machine needle (9), and be provided with the thread rewinding hole (14bc) configured by the swing thread take-up lever (14) The swinging thread take-up lever thread hanging plate (17) is at a position away from the needle side and can hang the thread (T) for which the thread path (2) is selected. The thread rewinding device of this sewing machine can select the most appropriate thread rewinding control.

Description

Thread rewinding device for sewing machine

technical field

The invention relates to a thread rewinding device of a sewing machine, which comprises a needle bar that moves up and down in conjunction with an upper shaft and a needle is installed at its lower end, is fixed on the upper end of the needle bar and has a Needle bar thread take-up lever with multiple thread rewinding holes to control the amount of suture pouring out, set on the side of the sewing machine head and having multiple thread rewinding holes that can pass through sutures on one end side, and reciprocatingly swings around the other end side Therefore, the swing thread take-up lever that controls the amount of suture thread is poured out, and can choose the first suture route from the thread reel to the above-mentioned machine needle through the above-mentioned swing thread take-up lever and the above-mentioned needle bar thread take-up lever and from the bobbin through the above-mentioned swing. The thread take-up lever reaches the second thread path of the needle above.

Background technique

A conventional sewing machine is provided with a thread unwinding device for controlling the amount of thread unwound toward the needle. This well-known thread rewinding device includes a needle bar thread take-up lever fixed on the upper end of the needle bar, a swing thread take-up lever that is synchronous with the needle bar and reciprocatingly swings, and the suture from the bobbin passes through the swing thread take-up lever and the needle bar The thread take-up lever reaches the needle. Then, with the coordinated action of the swing thread take-up lever and the needle bar thread take-up lever, the amount of suture pouring out is controlled.

In this regard, the device described in JP-A-11-76671 communiqué omits the needle bar thread take-up lever fixed on the upper end of the needle bar, and only uses the swing thread take-up lever to control the pouring out amount of suture.

When the needle bar thread take-up lever and the swing thread take-up lever are used to control the amount of suture pouring out, thread breakage does not occur due to the long suture path. However, since the amount of expansion and contraction of the suture becomes larger, the actual tension does not follow the value set by the thread adjustment mechanism, so that the thread supply from the bobbin side is not smooth, and as a result, a stiff stitch without slack is formed.

On the other hand, when only the swinging thread take-up lever is used to control the amount of suture pouring out, since the suture path is short, the tension of the suture is easily transmitted to all the sutures and the suture is supplied smoothly, and a slightly loose softness can be formed. of the stitches. However, when the amount of thread consumption changes rapidly due to changes in the thickness of the fabric, the expansion and contraction of the thread cannot be absorbed, and thread breakage may occur.

【Patent Literature】

Japanese Patent Application Publication No. 11-76671 (Fig. 1)

Like this, conventional one-sided thread rewinding device has the problem of easily forming hard stitches though it is difficult to break the thread due to its long suture path. In addition, the thread rewinding device on the other hand has a problem of easy thread breakage, although it can form soft stitches due to its short suture path.

The operator should prepare multiple sewing machines with thread rewinding devices with different performances. When the main purpose is to prevent thread breakage, or when the softness and hardness of the stitches are the main thing, just choose the one with the most suitable thread rewinding device for the purpose. A sewing machine will do. However, for this purpose, it is necessary to prepare and store many sewing machines, which not only increases the cost but also reduces the operability.

In order to solve the above problems, the present invention aims to provide a thread rewinding device that can use a sewing machine to select the most suitable thread rewinding control according to the purpose of preventing thread breakage or stitches being soft or hard, especially easy to adjust its thread rewinding device. trace device.

Contents of the invention

In order to solve the above-mentioned problems, the thread rewinding device of the sewing machine according to the present invention 1 includes: a needle bar 21 which moves up and down in conjunction with the upper shaft and has a machine needle installed at its lower end, and is fixed on the upper end of the needle bar And there are multiple thread-returning holes that can pass through the sutures, the needle bar thread take-up lever 16 that controls the amount of sutures to be poured out, and are arranged on the side of the sewing machine head, and one end side has multiple thread-returning holes that pass through the sutures And take the other end side as the center to reciprocate the swing thread take-up lever 14 to control the pouring amount of the suture;

You can select the first thread path R1 from the bobbin to the needle through the swing thread take-up lever and the needle bar thread take-up lever and the second stitch from the bobbin to the needle through the swing thread take-up lever line path R2,

A swing thread take-up plate 17 is provided at a position closer to the needle side than the thread rewinding hole of the swing thread take-up, and capable of hanging the thread of the second thread path selected.

According to the thread rewinding device of the sewing machine of the present invention 1, the thread take-up lever thread hanging plate is swung, and the thread is not hung up when the first thread path is used to form a stitch, but is hung up when the second thread path is used to form a stitch. stitches. That is, the thread take-up lever thread hanging plate is swung to only perform thread lifting and thread rewinding control when using the second thread path, and not perform thread lifting and thread rewinding control when using the first thread path. Therefore, since it is not necessary to consider the influence of the swinging thread take-up lever thread hanging plate when adjusting the stitches when using the first stitching path, it is easy to adjust the stitches.

The thread rewinding device of the sewing machine according to the present invention 2 is the thread rewinding device of the sewing machine according to the present invention 1, further comprising: being arranged at a position closer to the needle side than the swing thread take-up lever thread hanging plate and having Auxiliary thread guides 18 respectively corresponding to a plurality of thread holes of the reversing thread holes of the swinging thread take-up lever,

The suture path connecting the center of the reversing thread hole of the swinging thread take-up lever and the corresponding center of the thread hole of the auxiliary thread guide is consistent with the swing track surface of the swinging thread take-up lever.

According to the thread rewinding device of the sewing machine of the present invention 2, when the second thread path is used for sewing, even if the swing thread take-up lever reciprocates, the thread does not swing from side to side, so a stable amount of thread can be obtained.

The thread rewinding device of the sewing machine according to the present invention 3 is the thread rewinding device of the sewing machine according to the present invention 2, characterized in that: the thread hole of the auxiliary thread guide is formed with a thread that can be introduced from the needle side The notch part 18bb.

According to the thread rewinding device of the sewing machine of the present invention 3, the threading operation is easy.

The thread rewinding device of the sewing machine according to the present invention 4 is the thread rewinding device of the sewing machine according to the present invention 2 or 3, characterized in that the auxiliary thread guide is supported on the frame so that it can move up and down or left and right and fixed in the specified position.

According to the thread rewinding device of the sewing machine of the present invention 4, by adjusting the position of the auxiliary thread guide, the suture path can be changed and the amount of thread output can be adjusted

Description of drawings

Fig. 1 is a perspective view of a first embodiment of the present invention.

FIG. 2 is an enlarged view of a thread-reversed portion in FIG. 1 .

FIG. 3 is a diagram showing a change in the suture route when the auxiliary thread guide 18 is moved.

Fig. 4 is a detailed view of a second suture route viewed from the panel side.

Fig. 5 is a detailed view of the auxiliary thread guide.

In the figure: needle bar—21, 16—needle bar thread take-up lever, 14—swing thread take-up lever, R1—first suture path, R2—second suture path, 17—swing thread take-up lever thread hanging plate, 18 - Auxiliary wire guide, 18bb - Notch.

Detailed ways

A first embodiment of the present invention will be described with reference to FIGS. 1 to 4 . In addition, only one suture T and one bobbin 5 are illustrated in the drawings, and other sutures and bobbins are omitted.

Fig. 1 shows a sewing machine 1 for decorative sewing or chain stitch decorative sewing as an example of the present invention. This decorative stitch sewing machine 1 is provided with a thread rewinding device 11 for performing a thread pulling operation for pulling the thread T and a thread rewinding operation for loosening the thread T. The frame of the decorative stitch sewing machine 1 is composed of a base plate 2 , a body portion 3 extending upward from the right side of the base plate, and a machine head 4 extending from the body portion 3 parallel to the base plate 2 .

Further, on the upper portion of the decorative stitch sewing machine 1, a bobbin 5 supported by a bobbin stand (not shown) is disposed. In addition, facing the operator, thread regulators 6, 7, 8 are arranged on the body portion 3 of the sewing machine from the upper side. The three thread regulators 6 on the upper side apply tension to the suture T passing through the three machine needles 9 respectively. In addition, the thread adjuster 7 on the lower side applies tension to the upper decorative thread passed through the upper decorative thread divider 10 , and the thread adjuster 8 applies tension to the shuttle thread disposed inside the bottom plate portion 2 .

An upper shaft (not shown) is incorporated in the machine head 4, and the needle bar 21 is connected to the upper shaft. Needle bar 21 has fixed 3 machine needles 9 at its lower end. The upper decorative thread divider 10 is arranged on the jaw portion of the machine head 4 on which the needle bar 21 is arranged. The upper decorative thread divider 10 is connected to an upper shaft (not shown in the figure), and moves back and forth on the surface side of the sewn object in conjunction with the needle 9 . In addition, the shuttle, which is not shown in the figure, is installed in the bottom plate portion 2, and swings in the Y direction perpendicular to the sewing direction X on the back side of the sewn product in conjunction with the needle 9. Therefore, the upper decorative thread splitter 10 forms decorative stitches while tangling the upper decorative thread on the stitches formed by the coordinated action of the three machine needles 9 and the machine shuttle.

The thread rewinding device 11 located on the machine head 4 is equipped with the following devices sequentially on the suture line from the thread regulator 6 to the machine needle 9: that is, the oil supply device 12, the movable thread guide 13, the swing thread take-up Bar 14, swing thread take-up lever thread hanging plate 17, auxiliary thread guide 18, the needle bar thread take-up lever 16 that is located at needle bar 21 tops, the needle bar thread take-up lever thread hanging plate 15 that is located at its bottom. In addition, only one suture T is shown in the drawing, but usually, the thread rewinding device 11 performs thread lifting and rewinding of three sutures T.

The above-mentioned oil supply device 12 has an oil supply part 12a containing silicone oil as a lubricant, and a felt impregnated with silicone oil is incorporated in the oil supply part 12a. When the suture T passes through the oil supply device 12, it comes into contact with the felt and is coated with silicone oil. In addition, on the downstream side (left side in the drawing) of the suture path of the oil supply part 12a, the lead part 12b and the extension part 12c bent into an L-shape are fixed, and three thread holes are formed on the lead part 12b. On the extension portion 12c facing the operator, a long hole 12d is formed in the Y direction.

The movable thread guide 13 provided on the downstream side of the suture path of the guide portion 12b is composed of a support body 13a and three guide rods 13b formed with thread holes at the upper end thereof. Each lead rod 13b is vertically supported by a through hole formed in the vertical direction of the support body 13a, and is fixed at a predetermined position by a screw.

Moreover, the support body 13a is fixed to the extension part 12c by the screw 24 which penetrates the long hole 12d of the extension part 12c. The screw 24 is moved along the elongated hole 12d and fixed at a predetermined position to adjust the Y-position of the supporting body 13a in the left-right direction in the drawing. By adjusting the left and right positions of the support body 13a or the up and down positions of the guide bar 13b, the amount of thread lifting and rewinding can be adjusted.

The swing thread take-up lever 14 is composed of a swing base 14a and a swing arm 14b extending from the swing base 14a in the Y direction. The swing base 14a is fixed on one end side of the drive shaft 19 connected to the upper shaft not shown in the figure. When the upper shaft rotates, the drive shaft 19 moves and swings, and the swing thread take-up lever 14 swings up and down around the drive shaft 19. .

The rear end side of the swing arm 14b is fixed to the swing base 14a, and the front end side is bent toward the operator. Three thread rewinding holes 14bc are formed in the bent portion 14ba, and the sutures T passed on the three needles 9 are passed through. The thread lifting operation and the thread rewinding operation of the suture T passing through the three thread rewinding holes 14bc are performed by the swing of the oscillating thread take-up lever 14 centered on the drive shaft 19 .

On the downstream side of the swing thread take-up 14, that is, at a position away from the needle side from the thread reversing hole 14bc formed at the front end of the swing thread take-up, a swing thread take-up plate 17 is sequentially arranged toward the needle 9. And auxiliary wire guide 18.

The swinging thread take-up lever thread hanging plate 17 is arranged on the side close to the machine needle by the thread rewinding hole 14bc of the swinging thread take-up lever 14, that is, on the outside of the swing track of the swinging thread take-up lever 14. The swinging thread take-up lever thread hanging plate 17 is composed of a main body portion 17a fixed on the sewing machine head side 4 facing the operator and a thread hanging portion 17b extending from the main body portion to the operator. On the main body portion 17a, a long hole 17c is formed along the up-down direction. The swinging thread take-up rod thread hanging plate 17 can slide along the elongated hole 17c, and is fixed at a prescribed position by the screw passing through the elongated hole 17c.

The auxiliary thread guide 18 is disposed on the side closer to the needle than the swing thread take-up plate 17 . The auxiliary thread guide 18 is composed of a main body portion 18a fixed to the side surface 4 of the sewing machine head, and a wire portion 18b extending from the main body portion toward the operator. On the body portion 18a, a long hole 18c is formed in the up-down direction through which the screw 20 passes. The auxiliary thread guide 18 can slide vertically through the long hole 18c and the screw 20, and is fixed at a predetermined position of the sewing machine head 4 by the screw 20. And, by the adjustment of the upper and lower positions of the swinging thread take-up lever thread hanging plate 17 and the auxiliary thread guide 18, the thread lifting amount and the thread rewinding amount can be adjusted.

In addition, three wire holes 18d are formed in the wire portion 18b of the auxiliary wire guide 18 . The three wire holes 18d correspond to the three thread-reversing holes 14bc of the swing thread take-up lever 14, respectively. And, along the Y direction perpendicular to the cloth feeding direction X, a suture path R2 is formed connecting the center of the reversing hole 14bc of the swinging thread take-up lever 14 and the center of the thread hole 18d of the corresponding auxiliary thread guide.

The needle bar 21 supported on the machine head 4 so as to be able to move up and down moves up and down in conjunction with the upper shaft, and the needle 9 is installed at the lower end thereof. The needle bar thread take-up lever 16 fixed to the upper end of the needle bar 21 extends from the needle bar 21 to the operator's side (the front side in the drawing), and three thread rewinding holes 16a are formed in its central part. Corresponding to the three sutures T respectively.

Near the sewing machine head 4 upper end side of the needle bar thread take-up bar 16, the needle bar thread take-up bar thread hanging plate 15 is fixed. The needle bar thread take-up bar thread hanging plate 15 is U-shaped when viewed from the upper side, and the suture T is passed through the U-shaped space. In addition, a suture guide 22 is fixed to the lower end side of the jaw portion of the hand piece 4 . The thread T is guided to the needle 9 after passing through the thread guide 22 .

Next, the operation of the first embodiment will be described.

In the first embodiment, either of the two suture paths R1, R2 can be selected.

The first thread path R1 is from the bobbin 5 through the thread adjuster 6, the oil supply device 12, the guide rod 13b, the rewinding hole 14bc of the swing thread take-up lever 14, the outside of the needle bar thread take-up lever thread hanging plate 15, the needle The thread reversing hole 16a of the rod thread take-up lever 16, the inner side of the needle bar thread take-up lever thread hanging plate 15, and the path where the thread guide 22 reaches the machine needle 9.

In addition, the second suture path R2 is the hanging thread from the bobbin 5 through the thread regulator 6, the oil supply device 12, the guide rod 13b, the thread rewinding hole 14bc of the swinging thread take-up lever 14, and the thread hanging plate 17 of the swinging thread take-up lever. The upper side of the part 17b, the rewinding hole 18ba of the auxiliary thread guide, and the thread guide 22 reach the path of the machine needle 9.

And, when the first thread path R1 is selected, the swinging thread take-up lever 14 and the needle bar thread take-up lever 16 are driven to control the amount of thread lifting and rewinding in conjunction with the upper shaft of the sewing machine. In addition, when the second thread path R2 is selected, the thread take-up lever 14 is driven to swing in conjunction with the upper shaft of the sewing machine to control the amount of thread lifting and rewinding.

Since the first suture route R1 is longer than the suture route of the second suture route R2, it is selected for preventing thread breakage. On the contrary, since the second stitching path R2 is shorter than the stitching path of the first stitching path R1, it is selected when it is desired to form soft stitches.

According to the first embodiment, the swing thread take-up plate 17 is arranged on the needle side of the thread rewinding hole 14bc of the swing thread take-up 14, that is, on the outside of the swing trajectory of the swing thread take-up 14.

Swing thread take-up lever thread hanging plate 17, suture thread T is not hung up when using the first suture path R1 to form stitches, and suture thread T is hung up when using the second suture path R2 to form stitches. That is, because the swing thread take-up lever thread hanging plate 17 only performs thread lifting and thread rewinding control when using the second suture path R2, and does not perform thread lifting and thread rewinding control when using the first suture path R1, so in When adjusting the stitches while using the first thread path R1, the influence of the swinging thread take-up lever thread hanging plate 17 can be ignored, so the stitches can be easily adjusted. The so-called stitch adjustment refers to changing the suture route, suture tension, etc., when changing hard stitches to soft stitches, or adjusting the size of thread loops to prevent thread skipping.

In addition, when the first thread path R1 is used, since the thread T is not caught on the swingable thread take-up lever 14, a new thread bending point does not occur, so thread breakage does not occur.

And, the thread rewinding hole 14bc of the swing thread take-up lever 14 swings up and down in the Y direction. In addition, the second thread path R2 passing through the guide bar 13b, the thread rewinding hole 14bc of the swing thread take-up lever 14, and the thread rewinding hole 18ba of the auxiliary thread guide is located on a straight line along the Y direction. When forming stitches using the second thread path R2, even if the swing thread take-up lever 14 swings back and forth, since the thread T does not swing left and right, a stable thread lifting amount can be obtained.

The present invention is not limited to the above-described embodiments, and various changes can be made.

For example, as shown in FIG. 5( a ), an auxiliary wire guide 18 is formed with a thread-reversing hole 18 d. In addition, as shown in Figure 5(b), when a notch 18bb that is gradually narrowed from the needle side to the thread rewinding hole 18d (shown in the Z direction) is provided, the threading operation becomes easier, and the threading operation becomes easier during sewing. There is no need to worry about sutures coming out.

In addition, while the swinging thread take-up lever 14 swings up and down in the Y direction, the second suture path R2 connecting the center of the rewinding hole 14bc of the swinging thread take-up lever 14 and the thread hole center of the corresponding auxiliary thread guide 18 is located along the Y direction. Direction 1 on a straight line. Instead, the swing track surface of the thread rewinding hole 14bc of the swing thread take-up lever 14 is in the direction of the second suture route R2, not limited to the Y direction, as long as the swing track surface of the swing thread take-up lever 14 is consistent with the direction of the second suture route That's it.

In addition, the auxiliary thread guide 18 has long holes 18c formed in the vertical direction, but instead, long holes may be formed in the left-right direction (Y direction), so that the auxiliary thread guide can be easily adjusted in the left-right direction.

In addition, it is also conceivable to mount the swing thread take-up lever thread plate 17 and the auxiliary thread guide 18 on a mounting plate fixed to the sewing machine head 4 . At this time, the mounting plate can be adjusted in the up and down direction relative to the sewing machine head, and the swing thread take-up lever thread hanging plate 17 and the auxiliary thread guide 18 can also be easily adjusted to the left and right on the mounting plate. It may also be considered that the up-down direction and the left-right direction are the same direction.

(invention effect)

As mentioned above, according to the present invention 1, the thread take-up lever thread hanging plate is swung, and the suture is not hung when the first suture path is used to form a stitch, but the suture is hung when the second suture path is used to form a stitch. . That is, the thread take-up lever thread hanging plate is swung to only perform thread lifting and thread rewinding control when using the second thread path, and not perform thread lifting and thread rewinding control when using the first thread path. Therefore, when using the first suture path for stitch adjustment, the stitches can be easily adjusted regardless of the influence of the swinging thread take-up lever thread hanging plate.

According to the second invention, when the second suture path is used to form stitches, even if the oscillating thread take-up lever swings back and forth, the suture does not swing left and right, so a stable thread lifting amount can be obtained.

According to the present invention 3, the threading operation can be made easy.

According to the present invention 4, by adjusting the position of the auxiliary thread guide, the suture path can be changed and the amount of thread lifting can be adjusted.

Claims (4)

1. the line falling device of a Sewing machines is characterized in that, comprising:

Move up and down with last axle interlock and be equipped with in its lower end eedle shank and

Be fixed in the upper end of described shank and have a plurality of line fallings hole that can pass suture, the control suture amount of pouring out the shank thread take-up tension lever and

Be located at the head of sewing machine side, one distolateral have a plurality of line fallings hole of passing suture and distolateral with another be that the swing thread take-up tension lever that reciprocally swinging is controlled the amount of pouring out of suture is carried out at the center;

Can select to arrive the 1st suture path of described eedle and pass through the 2nd suture path that described swing thread take-up tension lever arrives described eedle through described swing thread take-up tension lever and described shank thread take-up tension lever from bobbin from bobbin;

Be provided with the position that is disposed at than the more close eedle side in line falling hole of described swing thread take-up tension lever, and can hang up the swing thread take-up tension lever thread gripping-board of the suture in selecteed described the 2nd suture path.

2. the line falling device of Sewing machines according to claim 1, it is characterized in that, also comprise: be configured in than the position of the more close eedle side of described swing thread take-up tension lever thread gripping-board and have the auxiliary conductor device in a plurality of lines hole in the line falling hole that corresponds respectively to described swing thread take-up tension lever

The center, line falling hole that connects described swing thread take-up tension lever reaches the suture path at center, line hole of corresponding described auxiliary conductor device with it, and is consistent with the swinging track face of described swing thread take-up tension lever.

3. the line falling device of Sewing machines according to claim 2 is characterized in that: on the line hole of described auxiliary conductor device, be formed with the notch part that can import suture from the eedle side.

4. according to the line falling device of claim 2 or 3 described Sewing machiness, it is characterized in that: described auxiliary conductor device, can move up and down or side-to-side movement be supported on the frame and be fixed in assigned position.

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