JP2824564B2 - Automatic thread cutting device of hook-type vertical multi-needle sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic thread cutting device for a hook needle vertical type multi-needle sewing machine, and more particularly to an automatic thread cutting device for a hook needle sewing machine having a plurality of vertical movements, the devices being simultaneously located at different positions. The hook needle and the sewing thread can be cut into a hook thread and a needle thread, respectively, and the cut hook thread end and the needle thread are provided with appropriate lengths. Furthermore, the thread cutting device of the hook needle vertical type multi-needle sewing machine of the present invention can reliably prevent the thread cutting device and members such as the sewing needle and the hook needle of the sewing machine from colliding with or interfering with each other, and the thread cutting can be performed. The object of the present invention such as stable and easy installation can be achieved.

[0002]

2. Description of the Related Art A multi-needle sewing machine is a model widely used in the sewing machine area, and in particular, a plurality of sewing needles above a sewing needle plate interlock with a plurality of needle threads, and a corresponding hook needle thread below the sewing machine needle plate interlocks with the same. Then, they intersect with each other to complete the sewing (ie, the so-called "chain-type" sewing), but the sewing principle and process are not the subject of the present application and will not be described. The automatic thread cutting device of the present application is used for a hook needle vertical type multi-needle sewing machine, and the hook needle of this sewing machine reciprocates back and forth in the direction of the sewing thread to interlock the hook thread. The technical problem that the present application seeks is that, when the sewing operation is bound, the needle thread and the hook needle thread are automatically cut, and the cut needle thread end and the hook needle thread end are in the same fixed position. To be fixed, and whether the remaining needle thread and hook needle thread ends have an appropriate length to make it convenient for the next sewing process.

[0003] A known thread cutting device of a multi-needle sewing machine mostly utilizes the swing of the angle of the thread cutting device to hook and sew a sewing thread and a hook needle thread to a fixed position, or to cut in a sewing direction. Utilizing a unidirectional reciprocating motion of a cutting blade installed at a right angle and beside the sewing line, a sewing thread or a hook needle thread is hooked, and further pulled to a fixed position for cutting. For example, the utility model application No. 75288507 of the Republic of China discloses a thread cutting device of a kind of a multi-needle sewing machine, in which a cutting blade of a thread cutting device is driven using an interlocking device to hook a sewing thread and a hook needle thread. Perform cutting and pinching operations. Also, for example, Republic of China Patent Application No. 811077878 discloses a kind of sewing machine thread cutting method and thread cutting device, in which a thread cutting device installed on the side of a sewing line is used to reciprocate in an oblique direction. Performs the hooking and cutting operations of the sewing thread and the hook thread.

[0004]

However, the known multi-needle thread cutting device basically has the following disadvantages. The movement trajectory of the member for catching (or hooking) the needle thread and the hook thread is an oscillating arc-shaped trajectory, and the hook needle easily collides and is damaged. Since the cut end of the thread is sandwiched, the gap between the catching member for the sewing thread and the hook sewing thread and the needle plate of the sewing machine cannot be largely separated. If it is too long, the interference of the hook will easily occur, and if it is too far, the cut thread end may be too long. Regardless of the angle-cut thread cutting device or the side-reciprocating-line thread cutting device, the length of the thread end after cutting varies, which is disadvantageous for the next sewing step.

[0005] The above-mentioned disadvantages are more remarkable especially in a hook-and-needle vertical multi-needle sewing machine. In view of this, the inventor of the present application has researched and created an automatic thread cutting device of this type of hook-type vertical multi-needle sewing machine, and has improved the above-mentioned disadvantages of the known art.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a novel automatic hook needle vertical multi-needle sewing machine, which can cut and cut a plurality of sewing threads and hook sewing threads at the same time. The thread ends of the previous hook thread and sewing thread can be sandwiched, and then the hook thread and sewing thread can be cut at the same time and fixed at a fixed position, which can be convenient for the next sewing process.

[0007] Another object of the present invention is to provide a new type of automatic vertical hook needle multi-needle sewing machine automatic thread cutting device, which cuts a cut sewing needle thread end and a hook needle thread end to a certain length. To make it convenient for the next sewing process.

It is another object of the present invention to provide a new type of automatic vertical needle multi-needle automatic thread cutting device, the installation of which is relatively simple and occupies unnecessary extra forehead space. This is advantageous for miniaturization of the sewing machine and does not interfere with the operation of other sewing machine members such as sewing needles and hooks.

[0009]

SUMMARY OF THE INVENTION The automatic thread cutting device of the vertical multi-needle sewing machine according to the present invention mainly includes a thread cutting section and a thread holding section. The thread cutting part is located in front of the sewing machine needle plate, and mainly includes one fixed blade and a plurality of movable blades (the number of movable blades is determined by the number of sewing needles of the sewing machine). The movable blade is driven by the power transmission mechanism to extend forward to hook the sewing thread and the hook sewing thread, further return them to the starting position, and cut the sewing thread and the hook sewing thread according to the fixed blade. . The thread holding portion is located below the sewing machine needle plate,
It mainly includes a plurality of hooks and claw claw assemblies (the number of hooks and claw claw assemblies is determined by the number of movable blades and the number of sewing needles of the sewing machine). In accordance with the operation, the hook needle is held between the hook hook and the hook by the hook claw elastic piece and the holding pin. When the thread cutting device returns to the origin, the sewing needle thread and the hook needle thread are cut at the same time, and the hook needle thread is It is put in a standby state after being pinched, so that it is convenient for the next sewing process to proceed. In addition, the cut needle thread ends are blown in a fixed direction on the needle plate side by an air pressure blow pipe installed on the side of the sewing needle, and are brought into a standby state, so that the next sewing process is facilitated. In addition, a plate-shaped yarn repelling plate device is installed between the needle plate and the yarn cutting section, and the operation is performed by horizontally moving the hook and the movable blade into and out of the yarn loop. To do.

The features and effects of the present invention will be described in detail below with reference to the accompanying drawings.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific example of the four-needle sewing machine shown in the drawings of the present invention will be described in detail below.

Referring to FIG. 1, an automatic thread cutting device 10 for a hook-and-needle vertical multi-needle sewing machine according to the present invention has a floor portion (be).
It is installed at the tail end of d) and is located just below the sewing needle, and the pneumatic or electromagnetic transmission mechanism 13 is installed at the tail end of the floor to drive the reciprocating motion of the thread cutting unit 11.

Referring to FIG. 2, the main part of the automatic thread cutting device of the hook needle vertical type multi-needle sewing machine according to the present invention comprises a thread cutting section 11.
And a yarn holding portion 12.

Still referring to FIG. 2 to FIG.
1 is located in front of the needle plate 14. In this specific example, the thread cutting unit 11 includes four movable blades 111, and the four movable blades 111 are fixed to the movable blade mounting plate 112 by screws,
In addition, it is held at a position where a certain interval is maintained. The movable blade mounting plate 112 is connected to a connecting rod 114 by an L-shaped connector 113.
The connecting rod 114 is connected to the transmission mechanism 13 to drive the movable blade 111 to reciprocate.

The fixed blade 115 of the thread cutting unit 11 is connected to the front end of the needle plate seat by an H-shaped fixed blade mounting plate 116.
The surface of the fixed blade mounting plate 116 is bent downward to the two protruding ends of the movable blade 111, and the elastic piece mounting plate 117 is connected to the two protruding ends. Abuts against the elastic piece 118 from below (see side views in FIGS. 10 and 11). The number and position of the elastic pieces 118
The purpose is to keep the movable blade 111 horizontal.

Referring to FIG. 2 and FIG.
Is located below the needle plate 14, and above it is the thread cutting portion 11.
And includes four hooks 121 and a thread hook claw assembly 120 as main parts. The position of the hook and thread hook claw assembly 120 is directly below the four movable blades 111 of the thread cutting unit 11. A hook 121 is installed on the assembly 120, and the hook thread 2 passes through a thread hole at the rear end of the hook. The claw thread claw 122 of the assembly 120 mainly includes a thread claw seat 123, a thread claw elastic piece 124, and a holding pin 125.
Of which the holding pin 125 is
3 and attached to the thread claw elastic piece 124. The hook 121 is also installed on the thread claw 123.

Claw 121 and claw thread claw assembly 120
Is attached to the mounting seat 126 and maintains a fixed position. The mounting seat 126 is connected to the hook transmission mechanism of the sewing machine, drives the reciprocating motion of the thread holding section 12, and performs the thread hooking operation of the hook 121 (see FIGS. 10 and 11). This part is a well-known sewing operation of the hook of the sewing machine and will not be described in detail here.

Referring to FIGS. 2, 3, 4 and 6, an integrally formed thread-repelling plate 21 is provided in front of the sewing machine needle plate 14, and four thread-repelling claws 22 are formed thereon. When repulsed, the loop of the hook needle thread is enlarged. The yarn repelling claw 22 is fixed to a yarn repelling plate interlocking shaft 23 below the fixed blade 115 of the thread cutting unit 11 (see FIG. 2), and the yarn repelling plate interlocking shaft 23 is driven by a transmission mechanism of the sewing machine to move left and right, Thereby, the yarn repelling plate 2
1 to move left and right.

Further, referring to FIG. 17, a pneumatic blowing tube 30 is provided on the right side of the sewing needle of the sewing machine, and the end of the cut sewing thread is blown to the left to make it convenient for the next sewing process.

[0020]

The thread cutting operation of the automatic thread cutting device 10 of the hook needle vertical type multi-needle sewing machine according to the present invention will be described below.

First, referring to FIGS. 3, 4, 8, 9, 10 and 11, when the sewing machine is stopped in order to cut the sewing thread and the hook needle thread and to take out the sewing product when the sewing is completed, the thread cutting device 10 is used. Is located at the top dead center (not shown) of the vertical movement so as not to collide with the sewing needle, and the lower thread holding portion 12 moves to a stake near one end of the thread cutting portion 11,
And the needle plate 14 is in a horizontal relationship (FIG. 11), and the movable blade 111 of the thread cutting portion 11 is located at the start position (FIGS. 3 and 8). When the transmission mechanism is activated to link the movement of the thread cutting unit 11, the movable blade 111 extends toward the hook 121 (FIG. 9), and finally reaches the dead point (FIGS. 4 and 8). Return to the starting position again. In this process, the movable blade 111 passes through the space in the center of the yarn repellent plate 21, and the operation of holding and cutting the yarn is completed in the process of the reciprocating movement.

Referring further to FIGS. 12 to 16,
The movable blade 111 and the repellent yarn plate 21 and the corresponding open eye needle 121 that
Exercise in a small gap between . When the thread cutting operation is started, the transmission mechanism 13 drives the movable blade 111 to drive the needle plate 1.
4 at this time, the tip 31 of the movable blade is
It moves toward the thread loop of the hook needle thread 2 that has escaped from the tip of the back hole of FIG. 1 (FIGS. 12 and 13). Looper thread 2 by the action of the left and right movement of the repellent yarn plate 21 (movement of the sewing direction perpendicular) to form an enlarged thread loop moves by being pressed by the left and right, easy movable blade tip 31 Ru been <br/> so that through the thread loop. At this time, the movable blade 111 continuously advances, separates the sewing thread 3 into right and left, and passes through the thread loop of the sewing thread 3 . Looper thread 2 by the movement towards the further prior of the movable blade 111, slides over the variable movable blade flange 32
It slides into the recess 33 after the protruding edge 32 (FIG. 14).
When the movable blade 111 moves forward and reaches the dead center, the sewing thread 3 and the hook needle thread 2 are already hooked together in the concave portion 33 of the movable blade 111.
And held (FIG. 15). At this point the movable blade
111 starts to return to its initial position. Of the movable blade 111
During the return from the dead point , the hook needle thread 2
And while being introduced into the gap between the retaining pin 125, Ru is sandwiched. At this time , the movable blade 111 continuously moves backward.
Subsequently , the sewing thread 3 and the hook thread 2 are pulled and moved toward the fixed blade 115 . When these yarns 2 and 3 has reached the fixed blade 115 to cut the needle thread 3 and looper thread 2 at the same time (Fig. 1
6) . But the free end of the looper thread 2, the assembly 120
It is more already pinched. The open eye needle 121 and the movable blade 111 of the present invention in the yarn cutting operation, the vertical direction (sewing direction in the same direction
To the reciprocating motion of direction), looper thread 2 Contact after cutting
And the sewing thread 3 leaves a free end of the same length, which is convenient for the next sewing process.

The above description is a specific example of the present invention and is not a restrictive description. Any modification or variation based on the spirit of the present invention and claims is still within the scope of the present application. For example, any connection method between various component members in the present invention can employ a method well known in the industry, and is not limited to a type of fixing with screws.

[Brief description of the drawings]

FIG. 1 is a perspective view of a correlated position in a sewing machine of an automatic thread cutting device for a hook-type vertical multi-needle sewing machine according to the present invention.

FIG. 2 is a three-dimensional exploded view of the automatic thread cutting device of the hook needle vertical type multi-needle sewing machine of the present invention.

FIG. 3 is a plan view of the thread cutting section of the present invention when the movable blade is not extended.

FIG. 4 is a plan view when the movable blade of the thread cutting section of the present invention is extended.

FIG. 5 is a perspective view of the hook and sewing needle claw assembly of the thread holding portion of the present invention, in a state where the hook needle is already held between the thread claw elastic piece and the holding pin.

FIG. 6 is a plan view of the thread-repellent plate of the present invention.

FIG. 7 is a right side view of the yarn repellent plate of FIG. 6;

FIG. 8 is a plan view showing the relative positions of the movable blade of the thread cutting portion of the present invention when the movable blade is not extended (solid line portion) and when the movable blade is extended to the dead center (dotted line portion). .

FIG. 9 is a plan view showing a relative position of a thread cutting portion of the present invention with a nearby member when the thread cutting portion extends toward a front of a movable blade.

FIG. 10 is a left side view showing a relative position of the thread cutting section and the thread holding section of the present invention when the movable blade is not extended.

FIG. 11 is a left side view showing a relative position when the movable blades of the thread cutting section and the thread holding section of the present invention extend to the dead center.

FIG. 12 is a plan view showing a state where the movable blade of the present invention moves toward the hook and needle thread loop.

FIG. 13 is a plan view showing a state where the movable blade of the present invention enters a hook needle thread loop.

FIG. 14 is a plan view showing where the movable blade of the present invention enters the hook needle thread loop and just enters the sewing thread thread loop.

FIG. 15 is a plan view showing a state before the movable blade of the present invention enters the sewing thread loop and reaches the dead center.

FIG. 16 is a plan view showing a state in which the movable blade of the present invention moves toward the start position by pulling the hook needle and the sewing needle and holding the hook needle between the thread claw elastic piece and the holding pin.

FIG. 17 is a front view showing a state in which the thread end of the sewing needle is blown to one side by a pneumatic blowing pipe after the completion of the thread cutting by the automatic thread cutting device of the hook needle vertical type multi-needle sewing machine of the present invention.

[Explanation of symbols]

2 ... hook needle thread 3 ... needle thread 10 ... thread cutting device of hook needle vertical type multi-needle sewing machine 11 ... thread Cutting section 12 Thread clamping section 13 Transmission mechanism 14 Needle plate 21 Thread-repellent plate 22 ··· Yarn repelling claw 23 ···· Yarn repelling plate interlocking shaft 30 ····· Pneumatic blowing tube 31 ····· Movable blade tip 32 ····· Movable blade protrusion Edge 33 ... Moveable blade recess 111 ... Movable blade 112 ... Movable blade mounting plate 113 ... L-shaped coupler 114 ... · Connecting rod 115 ···················································································································· ..Hooks and hook-and-claw assembles 121 ... hook needle 122 ... hook needle thread claw 123 ... thread claw seat 124 ... thread claw elastic piece 125 ... holding pin 126 ..... Mounting seat

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) D05B 65/02 D05B 61/00 D05B 65/06

Claims (4)

(57) [Claims] 1. A needle plate installed at a tail end of a floor of a sewing machine, and a needle plate
And located below the sewing needle, the following moieties (i) and (ii): (i) a thread cutting unit (11); wherein said yarn cutting part is located in front of the sewing machine needle plate (14) and a plurality Movable blade (11
The plurality of movable blades (111) are a movable blade mounting plate;
(116) to be fixed while maintaining its position: the movable blade (111) of said plurality of movable blade mounting plate is driven is connected <br/> to the transmission mechanism by a connecting rod (13) by said transmission kinematic mechanism And
The thread cutting section has a separate fixed blade (115) ; the fixed blade (115) is attached to a fixed blade mounting plate and the sewing needle plate (1).
The fixed blade mounting plate is provided with a resilient piece mounting seat (117) for accommodating a plurality of resilient pieces (118).
And volume, the elastic force piece is held in a horizontal position <br/> movable blade press from below the movable blade (111); the number of the elastic force piece (118) and position a plurality of movable blade (111) corresponding to; (b) the thread gripping portion (12); wherein the yarn clamping unit is in a position below the said sewing needle plate (14) and yarn cutting part (1
Confronts 1) and comprises a plurality of hooking needle a (121) and looper thread pawl assembly (120); said assembly (12
0) is the hook (121), the thread claw elastic piece (124)
And from the holding bin (125) contacting the thread claw elastic piece.
Made;該鉤needle and該鉤needle thread pawl assembly is installed in the hook needle thread clamp seat (123) co;該鉤needle and the looper thread pawl assembly (120) is attached to the mounting seat (126); said
The mounting seat (126) is connected to the hook transmission mechanism of the sewing machine ,
Accordingly, the assembly (120) performs a reciprocating motion in the vertical direction. The automatic thread cutting device of the vertical multi-needle sewing machine includes: When performing the thread cutting operation, the plurality of movable blades (111) is driven by the heat transfer <br/> kinematic mechanism (13) moves horizontally in the longitudinal direction toward the needle plate (14), whereas該鉤needle (121) is water parallel to the sewing needle plate (14) located in Tairai location, in the process leading to dead center movable blade is pre proceeds, the looper thread (2)
A set of multiple thread loops of the corresponding needle thread (3) is advanced separately through the movable blade to form a recess (33) in the movable blade.
The slides and retained therein; in the process of movable blade is to return to the position of starting from the dead point, between the該鉤needle thread (2) yarn claw resilient piece (124) and said retaining pin (125)
Is there the clamping together is introduced into the gap, so that when the movable blade is returning to the position of the start, <br/> with the sewing needle thread and該鉤needle thread to be cut at the same time, and wherein, Automatic thread cutting device for hook-type vertical multi-needle sewing machine. 2. One more integrally formed thread-repellent plate.
(21) ; the thread- repellent plate has a plurality of thread-repellent claws at its front end.
(22) and arranged in front of the sewing needle plate (14).
Is connected to the location has been repellent yarn plate interlocking shaft (23), said interlocking shaft
(23) is perpendicular to the sewing direction by the transmission mechanism of the sewing machine.
When driven to reciprocate left and right in the
The bent part of the hook thread (2) near the needle hole of 21) is large
Ku spread, automatic yarn cutting apparatus according to claim 1, wherein said movable blade and said Rukoto is to easily enter the curved Tsu portion of該鉤needle thread. It includes wherein further air blowpipe, said spray pipe is located on one side of the needle of the sewing machine, cut sewing needle thread (3)
2. The automatic thread cutting device according to claim 1, wherein the free end is blown in the opposite direction to facilitate the next sewing step. 4. A yarn cutting part of the transmission mechanism automatic thread cutting device according to claim 1, characterized in that the air operation Doshiki or electromagnetically driven.