JP2594885B2 - Multi-needle sewing machine thread cutting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thread cutting device for a multi-needle sewing machine. In detail, it is possible to reliably prevent collision and mutual interference between the thread cutting device and the hook that moves horizontally and linearly in the sewing machine, and perform sewing, thread cutting,
The present invention relates to a thread cutting device capable of securing a thread and securing re-sewing.

[0002]

2. Description of the Related Art Multi-needle sewing machines have been widely used for a long time.
Used in houses and factories. Sewing of multi-needle sewing machine
Most of the needles are above the sewing needle plate.
Pull down, there is one hook thread below the needle plate.
The manufacturing method, principle and operation process are not considered in this application.
Omitted. It is considered that the sewing is complete
Is completed, the thread is cut once, engaged again and spliced.
Sewing is performed continuously. Thread cutting of well-known multi-needle sewing machine
As the device, Taiwan Utility Model Application No. 75288507
is there. The application discloses a thread cutting device for a multi-needle sewing machine.
I have. FIG. 1 of the application As shown in FIG. 3 and FIG.
By interlocking the cutting blade 2 of the yarn cutting device with 30 as shown in FIG.
4 and 5 with respect to the yarn 61 during the angle operation process.
Hack. Cut and pinch the thread 61 after sewing in each paragraph
Sandwiched between the plate 25 and the catching member 13 to facilitate the next sewing operation.
To be useful.

[0003]

When the yarn is subjected to an operation process as shown in FIG. 9 of the above-mentioned Taiwanese application using the whole mechanism of the invention, it is convenient for hooking, cutting, and pinching, but it is basic. The following disadvantages exist: (1) The movement trajectory of the capturing member is an oscillating arc-shaped trajectory.
It easily collides with the hook and breaks. (2) It is necessary to pinch the thread, and the catching member cannot be largely separated from the needle plate, and it is possible to ensure that the thread is pinched only when approaching very close. Therefore, they are too close to each other and easily interfere with the hook, and if they are too far apart, the cut end of the hook is too long.

In view of this, the inventor of the present invention has gained many years of production and experience of customer claims, and has made research and improvements.
Finally, a thread cutting device for a multi-needle sewing machine according to the present invention which has solved the above-mentioned known disadvantages has been created.

Accordingly, a main object of the present application is to provide a thread cutting device for a multi-needle sewing machine.

[0006]

The thread cutting device of the present invention is mounted below a needle plate of a multi-needle sewing machine mechanism, and a thread cutting device portion is provided above the needle plate, and the thread cutting device portion is an interlocking device portion. , Exercised by the pinch remover part, the standby position,
Performs a series of linear reciprocating motions such as hooking the front body, cutting backward, pinching the thread, and removing the pinch.

A feature of the present invention is that a thread pinching device portion is provided at an appropriate position on the side of the thread cutting device portion, whereby the cut end of the hooked needle is instantly released, and at the same time, the thread pinching device is used. The thread is clamped to facilitate the next sewing operation.

Another feature of the present invention is that the thread cutting device portion is far away before starting the thread cutting operation, does not disturb the sewing process of the sewing needle and the hook needle, and when the thread cutting operation is started. The sewing needle moves up to the top dead center, the hook moves to the left dead center, and all the threads are loosened.The thread cutting device starts to operate at this time, and the upper and lower cutting blades for cutting the thread At the same time to the fixed point position, extending the lower cutting blade from this fixed point position to capture the needle thread and the hook needle thread, at this time, the lower cutting blade first pushes open the elastic piece on the thread pinching device part, Furthermore, the hook needle thread is drawn between the pin of the thread pinching device portion and the resilient piece that is pushed open by the lower curved guide piece provided at the tip of the lower cutting blade, and thereafter the needle thread is hooked on the lower cutting blade. The thread continues to retreat to the fixed position of the upper Further first needle thread was cut to the upper cutting edge and then cutting the looper thread. The cut hook thread is pinched by the pin of the thread pinching device portion and the elastic piece that has returned to the original position, and prepares for the next sewing.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS The objects and features of the present invention will be described in detail with reference to the accompanying drawings, in which: FIG.

FIGS. 1, 2 and 3 show an optimum embodiment of the present invention. A plate body 10, a thread cutting device portion 20, an interlocking device portion are provided below a needle plate of a wheel mechanism of a multi-needle sewing machine. 3
0, including the thread clamp device portion 80. The plate 10 is provided with an arrangement groove 11 and two projecting shafts 13, 14, and a return spring 140 is provided on the projecting shaft 14. The protruding shaft 14 is fixed to the plate body 10 in accordance with the spring seat 1400.
402 is provided. The stop 170 is Ke set <br/> the projecting shaft 17, the stop is controlled by a spring 171.

The thread cutting device section 20 has a lower cutting blade slide 21 and an upper cutting blade slide 22 provided side by side. A lower cutting blade 210 is provided at one end A of the lower cutting blade slide 21 therein. Is provided. As shown in FIG. 4, the lower cutting blade includes a front hook portion 2100 and a rear hook portion 2101, and a lower curved guide piece 2102 is provided at a cutting edge of the front hook portion 2100. The lower curved guide piece 2102 is an inclined side surface that extends rearward from the tip. The upper cutting edge 220 is also provided at one end B of the upper cutting blade slide 22, but the holding piece 221 is provided on the lower surface to hold the lower cutting blade 210. In this apparatus, the other end portions C and D of the two slides are arranged in parallel in the plate body arrangement groove 11, and the lower cutting edge 210 is arranged between the upper cutting edge 220 and the holding piece 221. Each of the other ends C of the slide is provided with a convex handle 211, and the upper cutting blade slide 22 is provided with a push rod 223 substantially at the center thereof. It is used for returning to the original position after the cutting blade moves, and a positioning guide 225 is provided to serve as a base for positioning the push rod 223.

The interlocking device portion 30 has a long plate shape, is covered by the protruding shaft 13 of the plate body 10, and swings around the protruding shaft 13 as a fulcrum. A long groove 31 is provided at an end F of the interlocking device portion, and the convex pattern 211 of the lower cutting blade slide is attached to the long groove 3.
1 and a long groove 32 is also provided at another end E,
The evangelism of the sewing machine (not shown) is received. The interlocking portion is interlocked by a protruding shaft 33 projecting from the center.

Referring to FIG. 3, the thread pinching device portion 80 is installed in a mounting groove 91 of a mounting seat 90,
The mounting seat 90 is installed on the machine body of the sewing machine. They include a mounting plate 800, a pin 803 is provided at one end of the mounting plate 800, and can be swung by a convex shaft 8041 and a fixed elastic piece 802.
The mounting plate 800 is set in the mounting groove 91 of the mounting seat 90 by the fixing spring 801 and the screws 8043 and 8044. The elastic piece 802 is provided with a convex edge 8022, and in a normal state, the convex edge 8022 is pressed by the spring 801.
22 and the pin 803 are pressed against each other, and
Is provided with a butting lid 8021 at the end thereof, which is located just above the pin 803.

The continuous operation of the thread cutting operation of the thread cutting device of the multi-needle sewing machine according to the present invention will be described below with reference to FIGS.

FIG. 5 shows a yarn cutting standby position. At this time, the interlock device portion 30 driven by a cylinder (not shown) pulls the lower cutting blade slide 21 backward in conjunction with the lower cutting blade slide 21, and the elasticity of the spring 140 and the spring 1402 causes the upper cutting blade slide 22 to move forward. Pressing, the protruding edge 214 and the protruding edge 224 are brought into close contact with one point, and the state of the standby position is established.

FIG. 6 shows the continuous operation of thread hooking. Upon command, the cylinder pulls interlocking section 30 and pushes lower cutting blade slide 21 forward, and upper cutting blade slide 22 is also simultaneously pushed forward by the resilience of springs 140 and 1402, causing upper cutting blade slide 22 to move forward. To maintain sufficient elasticity. At this time, the convex shaft 33 of the interlocking device 30 pushes the step piece 1401 to rotate in the angular direction of the spring seat 1400 to increase the elasticity of the spring, and at the same time, the stopper 170 rotates by the drive of the spring 171. , And is stopped at a fixed position by the action of a stopper, so that a certain sufficient elasticity is maintained. At this time, the upper cutting blade slide 21 is also brought into close contact with the protruding edges 224 and 214 by the interlocking of the interlocking device portion 30, and is moved to a predetermined position to be positioned.

FIG. 7 shows a yarn cutting operation. In a state where the upper cutting blade slide 22 is positioned at the fixed point, the lower cutting blade 210 is again driven to the left dead point by the interlocking unit 30, and the rear hooking portion 2101 of the lower cutting blade 210 is driven.
Then, the needle thread 60 and the hook needle thread 61 are captured by using the front hook part 2100, and then the interlocking device 30 is operated in the opposite direction, and the lower cutting blade 210 is pulled back to perform the cutting operation. Referring to FIGS. 10, 11, and 12, lower cutting edge 2
10 front hook portion 2100 and rear hook portion 2101
In the process of extending forward to capture the hook needle thread 61 and the needle thread 60, the lower cutting blade 210
It hits the elastic piece 802 of 0 and pushes it open.
At the same time, the hook needle thread 61 is pushed downward by the lower curved guide piece 2102 of the lower cutting blade 210 along the inclined side surface of the lower curved guide piece 2102 by the pin 803 of the thread pinching device portion 80 and the lower cutting blade 210. Between the elastic pieces 802. Also, the abutting lid 8 at the end of the elastic piece 802
021 also guides the hook needle 61 to the pin 803
The hook needle thread can be inserted between the elastic piece 802 and the hook needle thread 61 and can be prevented from separating from the gap. (The operation of the needle thread 60 is omitted in FIGS. 10 to 13 for clarity of the drawings.)

FIG. 8 shows that the lower cutting blade 210 and the upper cutting blade 220 positioned at a fixed point constitute a cutting mechanism. First, the needle thread 60 located at the rear hook portion 2101 is cut, and then the front thread is cut further. This is an operation of cutting the hook needle thread 61 located on the hook portion 2100. At this time, referring to FIG. 13, the lower cutting edge 210 returns from the left fixed point,
In the process of cutting the needle thread 60 and the hook needle thread 61 together with the upper cutting blade 220 positioned at the fixed point, the lower cutting blade 210 separates from the elastic piece 802 of the thread pinching device portion 80, so that the elastic piece 802 becomes a thread. Under the restraint of the spring 801 of the pinching device portion 80, the protruding edge 8 of the elastic piece 802 is formed.
022 is returned to be in a state of pressing against the pin 803,
Thus, the cut hook needle thread 61 located between the protruding edge 8022 and the pin 803 is clamped.

Thereafter, as shown in FIG.
0 swings back to the original position, and the upper cutting blade 22,
The lower cutting blade 21 is linked to return to the original standby position,
The cut hook needle thread 61 has already been clamped between the pin 803 and the elastic piece 802 of the thread clamp device portion 80. In this way, at the time of the next sewing, the thread ends are smoothly tied, and the sewing is performed in a cycle without any detachment.

[0020]

The effects of the present invention are as follows. (1) The present invention can move the upper cutting blade slide to the maximum and avoid the possibility of collision when the hook moves horizontally. Upper cutting blade slide 2 for the first time when cutting yarn
The lower cutting blade slide 20 and the lower cutting blade slide 210 are sent together to the home position, whereupon the lower cutting blade 21 is extended to capture the needle thread 60 and the hook needle thread 61 and pull them back to the home position, Upper cutting edge 2 waiting here
The thread cutting operation is performed by the operation of 2. For this reason, the cut end of the hooked thread becomes the shortest. (2) The hook needle thread 61 cut after the thread cutting operation is completed
Is pinched by the pin 803 of the thread pinching device portion 80 and the protruding edge 8022 of the elastic piece 802. In preparation for the next sewing, the thread ends are smoothly tied and never detached. (3) The structure of the thread pinching device portion 80 of the present invention is simple, easy to manufacture, and can exert good effects.
It has industrial utility value.

In view of the foregoing, the present invention overcomes many of the conventional disadvantages described above using a thread pinch device portion, and provides the objects and advantages of the invention.

However, the drawings and descriptions disclosed above are merely preferred embodiments of the present application, and modifications or equivalent changes made by those skilled in the art based on the spirit of the present application may still be applied to the present application. Should be wrapped around.

[Brief description of the drawings]

FIG. 1 is a three-dimensional exploded view of a local member of a thread cutting device of a multi-needle sewing machine of the present application.

FIG. 2 shows an assembled three-dimensional view of FIG. 1 of the present application.

FIG. 3 is a three-dimensional exploded view of a thread pinching device portion of the thread cutting device of the multi-needle sewing machine of the present application.

FIG. 4 is a perspective view of a lower cutting blade of a thread cutting device portion of the multi-needle sewing machine of the present application.

FIG. 5 shows a continuous continuous operation of the thread cutting device portion and the interlocking device portion of the thread cutting device of the multi-needle sewing machine of the present application.

FIG. 6 shows a continuous operation of hooking a thread in a thread cutting device portion and an interlocking device portion of the thread cutting device of the multi-needle sewing machine of the present application.

FIG. 7 shows a continuous operation of cutting the thread cutting device portion and the interlocking device portion of the thread cutting device of the multi-needle sewing machine of the present application.

FIG. 8 shows a continuous operation of clamping the thread cutting device portion and the interlocking device portion of the thread cutting device of the multi-needle sewing machine of the present application.

FIG. 9 shows a continuous operation of returning the thread cutting device portion and the interlocking device portion of the thread cutting device of the multi-needle sewing machine of the present application.

FIG. 10 shows a continuous operation of hooking a thread in a thread cutting device portion and a thread pinching device portion of the thread cutting device of the multi-needle sewing machine of the present application.

FIG. 11 shows a continuous operation of hooking a thread in a thread cutting device portion and a thread pinching device portion of the thread cutting device of the multi-needle sewing machine of the present application.

FIG. 12 shows a continuous operation of cutting the thread cutting device portion and the thread pinching device portion of the thread cutting device of the multi-needle sewing machine of the present application.

FIG. 13 shows a continuous operation of clamping the thread cutting device portion and the thread clamping device portion of the thread cutting device of the multi-needle sewing machine of the present application.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Plate body 11 Arrangement groove 13,14,17 Projection shaft 20 Thread cutting device part 30 Interlocking device part 80 Thread pinching device part 21 Lower cutting blade slide 22 Upper cutting blade slide 210 Lower cutting blade 220 Upper cutting blade 214,224 Convex edge 221 Holding piece 223 Push rod 225 Positioning guide 211 Projection pattern 2100 Front hook part 2101 Rear hook part 2102 Lower curved guide piece 31, 32 Long groove 33 Convex axis 140 Return spring 1400 Spring seat 1401 Step piece 1402 Spring 170 Stopper 171 Spring 800 Mounting Plate 801 Fixed spring 802 Resilient piece 803 Pin 8021 Butt cover 8022 Convex edge 8041 Convex shaft 8042, 8043, 8044 Screw 90 Mounting seat 91 Mounting groove 60 Needle thread 61 Hook needle thread

Claims (1)

(57) [Claims] 1. A thread cutting device for a multi-needle sewing machine in which a hook provided below a needle plate of the multi-needle sewing machine reciprocates horizontally and linearly. (A) A plate body 10; a plurality of protruding shafts 13, 14 and 17 are provided, condensate kissing pulling 140 is provided on one of the projecting shaft 14 therein, the return spring by a spring seat 1400 and the plurality of protruding shafts is fixed to the plate member 10, the spring seat is provided with stepped piece 1401 and the spring 1402, stop 170 another in one of said plurality of protruding shafts are provided, et al is,該止
The tool is controlled by another spring 171
That; (ii) lower cutting blade slide 21 and the upper cutting blade slide 2
A lower cutting blade 210 at one end A of the lower cutting blade slide, the lower cutting blade comprising front and rear hooks 2100, 2;
101, a lower curved guide piece 2102 is provided at a cutting edge of the front hook portion to form a cutting edge that develops an inclined side surface; and one end B of the upper cutting blade slide also has an upper portion. The cutting blade 220 is provided, and is abutted by the spring seat 1400, the step piece 1401, and the spring 1402 of the plate body 10, and is restrained by the stopper 170. The holding piece 221 is provided on the lower surface, and the lower cutting blade 2 is provided.
The device part 20 has the other ends C and D of the two slides arranged in parallel in the arrangement groove 11 of the plate body, and the lower cutting edge 210 has the upper cutting edge 220 The two slides are each provided with one convex edge so that they can be restrained by each other, and a convex handle 221 is provided at an end C of the lower cutting blade slide 21. The upper cutting blade slide 22 is provided with a push rod 223 at substantially the center thereof, and the push rod 223 is abutted by a return spring 140 on the main body projecting shaft 14; The device portion is covered by one protruding shaft 13 in the plate body 10 and swings with the protruding shaft as a fulcrum, and a long groove 31 is provided at one end F thereof, Cutting blade slide convex pattern 21
1 is fitted in the slot; another slot E is also
2 is provided to receive the transmission power of the cylinder by the projecting shaft 33 and the arrangement hole projecting at the center of the interlocking device portion; the interlocking device portion is protruded at the center portion. The protruding shaft 33 pushes the step piece 1401 of the plate body when the interlocking portion swings, turning the angular direction of the spring seat 1400 to increase the elasticity of the return spring. (D) a thread pinching device portion 80 including a mounting plate 800; a pin 803 is provided at one end of the mounting plate, and a convex shaft 8041 and a screw 804 are provided on the surface of the mounting plate.
2, 8043, 8044 installed; elastic on the convex axis
A piece 802 is provided, the resilient piece having a ridge 8022 and a butting lid 8021 at its end, which is located just above the pin; the screw fixes the spring 801 there to, said spring wherein by pressing the elastic piece is together pressed against the tongue with the pin of the elastic force pieces; mounting plate member is mounted in the mounting groove 91 of the mounting seat 90; has, here Then, the yarn cutting device section 20 starts the operation of cutting the yarn.
Before starting, it is far away and disturbs sewing process of sewing needle and hook.
When the thread cutting operation is started without
Ascends, needle moves to dead center, and all threads are loosened
The thread cutting device starts operating only at this time.
Cutting the upper cutting edge 220 and the lower cutting blade 210
At the same time, it is sent to the fixed point position, and from this fixed point position,
Extend the lower cutting blade to catch the needle thread and hook
At this time, the lower cutting blade first
Push open the force piece 802 and further set it at the cutting edge of the lower cutting blade.
The hook needle thread is
The pin 803 of the thread pinching device portion and the elastic piece pushed open.
After that, the needle thread is pulled into the lower cutting blade.
Hooked, and the hook thread continues to move to the fixed point of the upper cutting edge.
Back to the standby position, and further align with the upper cutting blade.
The above thread cutting device, characterized by first cutting the needle thread and then cutting the hook needle thread .