JPH09299675A - Sewing machine for sewing machine - Google Patents

Abstract

(57) Abstract: [PROBLEMS] To provide a sewing thread processing device of a sewing machine, which can improve operability and certainty in threading a sewing needle through a stitch hole. SOLUTION: During threading, a sewing thread T fed from a thread supply source is locked to a thread locking portion 51 of a threading device 7 and is also held between a thread guide plate 81 and a holding plate 79. The thread ends are cut by the thread cutting section 69. Then, by moving the threading device 7 from the upper position to the lower position, in connection with this lowering operation,
The operating member 65 rotates the release lever 61, and the release portion 71 operates the holding plate 79 to release the sewing thread holding action to release the thread end side of the sewing thread T, and the threading device operates. The threading hook portion 5 is rotated in the lower position.
5 is inserted into the eyelet of the sewing needle together with the thread T, and the thread T
The threading action is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing thread processing device for a sewing machine, which is provided with a threading device for threading a thread through the eye of a sewing needle.

[0002]

2. Description of the Related Art Conventionally, there has been known a sewing machine equipped with a threading device for threading a thread through a hole of a sewing needle. A threading hook that can be threaded, a thread locking portion for supplying the thread in the vicinity of the eyelet in a tensioned state, and a thread gripping portion are provided, and the thread that is stretched near the eyelet is provided at the tip of the hook. It has also been proposed that the threading hooks are hooked inside the opening and then the threading hook is released from the eyelet to thread the thread into the eyelet.

Then, as a thread end processing after the thread is guided to the threading device, a thread cutting section and a thread holding section are provided on the side surface of the face plate.

With respect to the structure and operation of this thread holding portion,
This will be described with reference to FIGS. 5A, 5B and 6.

As shown in FIG. 5 (a), an operator holds the end of the sewing thread w drawn from a thread spool (not shown) with a finger or the like before sewing and along the thread guide groove 100 and the thread guide groove 110. When guided, the sewing thread w is first locked by the thread locking portion 120 and then guided by the thread gripping portion 130. Thereafter, the sewing thread w is guided to the face plate side surface 140, guided to the thread holding section 150, and the thread cutting section 160 cuts the sewing thread w, as shown in FIG. 5B. In the thread holding portion 150, as shown in FIG. 6, the sewing thread w is held between the pressing plate 180 and the receiving plate 190 which are urged by the spring 170 to be installed in the face plate side surface 140 direction.

[0006]

However, the holding pressure of the thread holding portion 150 changes depending on the thickness of the sewing thread w,
When the holding pressure is high, the thread w is not easily removed from the thread holding part 150 when the threading device is lowered, and the thread w is disengaged from the thread gripping part 130. When the holding pressure is low, the thread cutting part 160 is released. When thread cutting is performed with, the sewing thread w slips out and the cut surface is fluffed, and the holding pressure in the thread holding portion 150 causes the threading performance to be unstable.

The present invention has been made in order to solve the above-mentioned problems, and provides a sewing thread processing device for a sewing machine which can improve operability and certainty in threading a needle through a stitch hole. It is intended to be provided.

[0008]

In order to achieve this object, a sewing machine for a sewing machine according to a first aspect of the present invention is provided with a sewing thread supplied in the vicinity of a stitch hole of a sewing needle at a tip portion thereof. A threading hook portion that can be caught and caught inside the opened opening, and the thread can be inserted into the eye hole of the sewing needle, and the thread approaches the sewing needle while the thread is locked during threading, and It has a thread locking portion that conveys the thread to a position corresponding to the eye of the sewing needle, and a thread gripping portion that holds the thread locked by the thread locking portion, and the thread can be threaded through the eye hole of the sewing needle. Between the lower position and an upper position separated from the lower position, and a threading device rotatably supported at the lower position, and a sewing thread gripped by the thread gripping portion. A thread cutting means for cutting at a position separated by a predetermined distance from the thread cutting means, the thread cutting means and the thread grip. And a thread holding means for holding the thread after cutting, which is particularly provided in connection with the operation of lowering the threading device from the upper position to the lower position. The sewing machine is provided with a suture releasing means for releasing the suture holding operation of the suture holding means.

According to the suture processing device of the present invention, during threading, the thread fed from the thread supply source is locked to the thread locking portion of the thread threading device and is also held by the thread holding means. The thread ends are cut by the thread cutting means. Then, by moving the threading device from the upper position to the lower position, the suture releasing means releases the suture holding action of the suture holding means in association with the lowering operation, and the suture end side of the suture is released. Is released, and the threading device is rotated in the lower position so that the threading hook portion is inserted into the eyelet hole of the sewing needle together with the sewing thread, and the threading action of the sewing thread is performed. In this case, the thread holding means holds the thread firmly at the time of cutting the thread and after the thread is cut, and when the threading device descends, the thread holding means opens the thread holding means to release the thread. The sewing thread held by the holding means is reliably released.

According to the sewing machine according to the second aspect of the present invention, the sewing thread releasing means has an operating position for releasing the sewing thread holding action of the thread holding means and an inactive position for not releasing the same action. An operation for moving the release member from the inoperative position to the working position when the threading device is lowered from the upper position to the lower position. It has a member. Therefore, when the threading device is lowered from the upper position to the lower position, the operating member moves the releasing member from the inoperative position to the operating position, so that the releasing member is moved to the lowering operation of the threading device. The sewing thread can be surely released by interlocking surely.

According to another aspect of the present invention, there is provided a sewing machine according to a third aspect of the present invention, wherein the base of the releasing member is movably supported between the working and non-working positions of the sewing machine body. It is constituted by one release lever having a releasing portion for operating the thread holding means and an engaging portion operated by the operating member. Therefore, since the release member is composed of the one release lever,
The structure centering on the release lever can be simplified and the sewing thread holding action of the thread holding means can always be released accurately at a predetermined timing by eliminating the transmission error of the operating force.

Further, a sewing machine according to a fourth aspect of the present invention is provided with a spring means for always arranging the release member in the inoperative position. Therefore, the sewing thread once held by the thread holding means is not released from the thread holding means unless the threading device is lowered from the upper position to the lower position, so that the sewing thread is not released carelessly. Therefore, a predetermined threading action can always be reliably performed.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments embodying a sewing thread processing device for a sewing machine according to the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a sewing thread processing device of a sewing machine according to this embodiment, and FIG. 2 is a perspective view showing a part of a threading device in particular.

As shown in FIG. 1, the needle bar base 1 has a needle bar 3
A threading rod 5 is rotatably supported around the axis of the threading rod 5 in parallel with and is slidable in the vertical direction. And
At the lower end of the threading rod 5, a thread locking portion 51 and a thread gripping portion 53 are provided.
And a threading device 7 having a threading hook portion 55.

On the other hand, on the upper side of the threading rod 5, as shown in FIG. 2, an operating pin 9 is inserted and fixed so as to penetrate the threading rod 5 in the axial direction. A hollow operating punch 11 is slidably inserted into the threading rod 5, and a compression spring 13 is interposed between the operating pin 9 and the operating punch 11. Further, a guide groove 15 is formed on the outer periphery of the operating punch 11 so as to extend upward in an arc shape along the outer periphery, and one end of the operating pin 9 is engaged with the guide groove 15. There is.

Further, at the upper end of the operating punch 11, the threading rod 5
Is formed on the outer periphery of the actuating punch 11, and is integrally formed on the spring table 19 and a moving base 21 described later. A spring 23 is stretched between a spring hook (not shown),
The operating pestle 11 is biased upward. A thread guide 57 is attached to the lower end of the needle bar base 1 which slidably supports the threading rod 5 in which the operating punch 11 is inserted, and the upper end of the needle bar base 57 is attached to the lower end of the needle bar base 1.
As shown in FIG. 1, one end of an L-shaped support shaft 25 is rotatably inserted while being prevented from coming off. The other end of the support shaft 25 is inserted into a threading support frame 27 fixed to a sewing machine frame (not shown) so as to be rotatable and prevented from coming off by a set screw 29. Then, the threading support frame 27
A guide rod 31 is fixed in parallel with the threading rod 5, and a movable base 21 provided separately from the operating punch 11 is slidably inserted into the guide rod 31.

A groove 33 extending along the sliding direction is formed on the moving base 21, and a pin 35 provided upright on the guide rod 31 is engaged with the groove 33 to slide the moving base 21. In case of, the rotation is stopped. In addition, the abutment portion 17 is provided on the upper end of the movable table 21 when the movable table 21 projects toward the operating punch 11 and slides.
Is formed with a protrusion 37 that can come into contact with. In the present embodiment, the movable table 21 is assembled so that the predetermined distance L is formed between the protrusion 37 and the contact portion 17 when the movable table 21 is at the uppermost position shown in FIG. It is possible to implement even if the protrusion 37 and the contact portion 17 are in contact with each other without forming the predetermined distance L.

The movable table 21 is provided with a rack portion 39 having teeth formed in the sliding direction. A pinion gear 41 rotatably supported by the threading support frame 27 is meshed with the rack portion 39. The pinion gear 41 is integrated with the helical gear 43, and the helical gear 43 is meshed with a worm gear 47 attached to the rotation shaft of a pulse motor 45 attached to the threading support frame 27. Has been done. The worm gear 47, the helical gear 43, the pinion gear 41, and the rack portion 39 constitute a transmission mechanism 49.

Next, the thread processing device of this embodiment will be described. Thread holding section 8 constituting the thread holding means of the present invention
5 and the thread cutting portion 69 which constitutes the thread cutting means are provided on the side surface of the face plate 2 above the terminal end portion of the thread guiding groove 91. Further, the releasing member 9 which constitutes the sewing thread releasing means of the present invention.
3 is provided inside the side surface of the face plate 2. Thread holding part 8
5 is a thread guide plate 81 having a guide shaft 73, and a holding plate 79, one of which is urged toward the thread guide plate 81 by a compression spring 77 held by an E ring 75 fixed to the guide shaft 73. It is composed of. Further, the thread cutting section 69 is on the front side (the front side of the sewing machine) of the thread holding section 85.
In addition, the cutter 87 is provided on the downstream side of the yarn holding portion 85 and has the blade surface facing upward.

The release member 93 is composed of a single release lever 61 rotatably supported by a support shaft 67 attached to the face plate 2. The release lever 61 is a torsion spring 59 that constitutes the spring means of the present invention.
Is always biased in the Y direction shown in FIG. Then, the release lever 61 causes the torsion spring 5 to
The face plate 2 is urged in the Y direction by 9
Is in contact with a stopper 95 that is integrally provided on the
A releasing portion 71 that presses the holding plate 79 to open the holding plate 79 is provided at the lower end of the contacting side, and the other end is in contact with the operating member 65 protruding from the lower end of the moving base 21 in the direction of the face plate 2. The engaging portions 63 contacting each other are formed by bending.

Next, the threading operation as a preparatory work and the operation of the thread end holding device prior to sewing will be described.

First, the user of the sewing machine is shown in FIG.
As shown in (d), the sewing thread T fed from a thread spool (not shown) and hung on the balance is guided in order. And FIG.
As shown in (a), the sewing thread T is introduced into the thread guide groove 4 and then guided into the thread guide groove 91. At this time, the sewing thread T is bent by the thread guide 57 and guided horizontally. Subsequently, FIG.
As shown in (b), the yarn end is guided in the direction of arrow a and brought to the end point of the yarn guide groove 91. In this process,
The sewing thread T is locked by the thread locking portion 51 arranged in the threading device 7, and then is gripped by the thread gripping portion 53. Then, as shown in FIG. 3C, the sewing thread T guided to the end point portion of the thread guide groove 91 is brought to the thread cutting section 69 by winding the thread holding section 85 around a half circumference. By doing so, the sewing thread T is compressed between the thread guide plate 81 and the holding plate 79.
It is held firmly by the holding pressure of 7. Further, as shown in FIG. 3D, when the sewing thread T is pulled in the direction of the arrow b, the upstream side of the sewing thread T is firmly held by the thread holding portion 85, so that the cut surface does not fluff and the thread cutting portion 6 does not fluff.
Thread cutting can be easily performed by the cutter 87 of No. 9.

When the sewing machine user presses a threading switch (not shown) after the above-described thread hooking, the pulse motor 45 of the transmission mechanism 49 is rotationally driven, and the moving base 21 is slid downward from the upper position. Move a predetermined distance L and move to the moving table 2
The protrusion 37 of No. 1 abuts on the contact portion 17 of the actuating pestle 11 to lower the actuating pestle 11.

At this time, as shown in FIG. 4 (a), the operating member 65 pushes the convex portion 63 of the release lever 61 in the direction of arrow e, so that the release lever 61 resists the action of the torsion spring 59. Since it is rotated and the releasing portion 71 pushes the contact portion 89 of the holding plate 79, the holding plate 79 pivotally supported by the oval hole 83 has the end surface of the thread guide plate 81 as a fulcrum and the guide shaft 73.
Is used as a guide to open and open in the direction of arrow d. This open state continues while the operating member 65 is descending and pushing the convex portion 63, and as shown in FIG.
1 is lowered, the threading rod 5 is lowered via the compression spring 13, the guide groove 15, and the actuating pin 9, and the threading device 7 is also lowered together with the lowering of the threading rod 5, so that in the thread gripping portion 53. The threading device 7 holding the sewing thread T pulls the thread end of the sewing thread T out of the thread holding portion 85. Then, the threading device 7 reaches the lowermost position while holding the sewing thread T and performs threading.

[0026]

As is apparent from the above description, according to the suture processing device of the first aspect of the present invention, when the threading device is lowered, the suture releasing action of the suture releasing device by the suture releasing device is performed. By releasing, the yarn is reliably pulled out from the yarn holding means regardless of the holding pressure of the yarn holding means. Further, at the time of thread cutting, the thread can be held by the thread holding means while firmly holding the thread, so that the work can be easily performed without fuzz on the cut surface. In this way, the operability and certainty in threading are improved by setting the thread holding means in the held state when the thread is threaded and in the open state when the threading device is lowered.

Further, according to the sewing machine thread processing apparatus of the second aspect, the sewing thread releasing means has an operating position for releasing the sewing thread holding action of the thread holding means and an inactive position for not releasing the same action. An operation for moving the release member from the inoperative position to the working position when the threading device is lowered from the upper position to the lower position. Since the member is provided, when the threading device is lowered from the upper position to the lower position, the operating member can move the releasing member from the inoperative position to the operating position. The lowering operation of the threading device can be reliably interlocked.

According to a sewing machine according to a third aspect of the present invention, the base of the releasing member is movably supported between the working and non-working positions with respect to the main body of the sewing machine. Since it is constituted by one release lever having a release portion for operating the yarn holding means and an engagement portion operated by the operating member, the configuration centered on this release lever can be simplified. At the same time, it is possible to eliminate the error in transmitting the operating force and always release the sewing thread holding action of the thread holding means accurately at a predetermined timing.

Further, according to the sewing thread processing device of the sewing machine of the fourth aspect, since the release member is provided with the spring means for always arranging the release member in the inactive position, the sewing member is once held by the thread holding means. Unless the threading device is lowered from the upper position to the lower position, the sewing thread is not released from the thread holding means, and therefore, there is no inadvertent release of the sewing thread, and a predetermined threading action is always ensured. It can be carried out.

[Brief description of drawings]

FIG. 1 is a perspective view of a sewing thread processing device of a sewing machine according to the present embodiment.

FIG. 2 is a perspective view of a thread processing device, particularly a threading device.

FIG. 3 is an explanatory diagram showing a series of yarn hooking operations.

FIG. 4 is an explanatory diagram showing the operation of the thread processing device.

FIG. 5 is an explanatory diagram showing an operation of a conventional yarn holding section.

FIG. 6 is an explanatory diagram showing a configuration of a conventional yarn holding section.

[Explanation of symbols]

 7 threading device 51 thread locking part 53 thread gripping part 55 threading hook part 59 torsion spring 61 release lever 69 thread cutting part 71 release part 79 holding plate 81 thread guide plate 85 thread holding part 93 release member T sewing thread

Claims (4)

[Claims] 1. A threading hook capable of catching a sewing thread supplied in the vicinity of a hole of a sewing needle inside an opening provided at a tip end thereof and inserting the sewing thread into the hole of the sewing needle. Part, a thread locking portion which approaches the sewing needle in a state where the sewing thread is locked during threading, and carries the sewing thread to a position corresponding to the eye hole of the sewing needle, and is locked by the thread locking portion. A thread gripping portion for gripping the sewing thread, and is vertically movable between a lower position where the thread can be threaded through the eye of the sewing needle and an upper position separated from the lower position, and is rotatable at the lower position. The threading device is supported, thread cutting means for cutting the sewing thread gripped by the thread gripping part at a position separated from the thread gripping part by a predetermined distance, and provided between the thread cutting means and the thread gripping part. And a thread holding device for holding the thread after the cutting, In the sewing machine, the thread processing device is provided with a thread releasing means for releasing the thread retaining action of the thread retaining means in association with the operation of lowering the threading device from the upper position to the lower position. . 2. The thread releasing device is constituted by a releasing member movable between an operating position for releasing the thread holding operation of the thread holding means and an inactive position for not releasing the operation. The sewing machine according to claim 1, further comprising an operating member that moves the release member from the inoperative position to the operating position when the threading device is lowered from the upper position to the lower position. Thread processing device. 3. The release member has a base portion movably supported between the working and non-working positions with respect to the sewing machine main body, and is operated by the release member and the operating member for operating the thread holding means. 3. The sewing thread processing device for a sewing machine according to claim 2, wherein the release lever is constituted by one release lever having an engaging portion. 4. A spring means for constantly disposing the release member in the inoperative position.
Alternatively, the sewing thread processing device of the sewing machine according to item 3.