JPH0819616B2 - Tuft stitch automatic embroidery 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 a tuft stitch automatic embroidery sewing machine capable of sewing a free embroidery pattern by a cutting pile by moving an embroidery frame stretched with cloth in an arbitrary direction by an automatic control device.

[0002]

2. Description of the Related Art FIG. 11 shows an essential part of a conventional tuft sewing machine. In this figure, 1 is a sewing machine bed, and on the lower part thereof, two looper shafts 3 and blade shafts 4 which are reciprocally rotated in conjunction with the vertical movement of the needle bar 2 are arranged.

A looper 6 is fixed to the upper end of the arm 5 fixed to the looper shaft 3, and a cutting blade 7 is provided below the looper 6. The arm 9 fixed to the other blade shaft 4 has a blade 1
0 is set. 11 is a feed dog and 12 is a presser bar 1 on the bed.
The presser foot at the lower end of 3 and 16 are sewing machine needles.

In the case of this conventional tuft sewing machine, the presser foot 1
The base cloth 15 at the lower part of 2 is fed in the direction of the arrow by the feed dog 11, and the sewing machine needle 16 penetrates the base cloth 15 together with the pile thread 17, and when the pile thread 17 descends below the base cloth 15, it swings to this portion. The moving looper 6 scoops the pile thread 17. Next, when the needle 16 moves up, the pile yarn 17 becomes a loop and is locked by the looper 6, and the feed dog 11
As a result, the base cloth 15 is fed by one pitch and the looper 6 returns.

With the above operation, the base portion of the looper 6, that is, the left side loop in FIG. 11, is cut by the vertical movement of the blade 10 to form a cut pile in a state where the looper 6 has a plurality of loops arranged in order. It moves with the cloth 15.

[0006]

As described above, in the conventional tuft sewing machine, the looper 6 is always cut from the front loop in a state in which a plurality of loops are locked. The reason is that the pile thread 1 immediately after being sewn on the base cloth 15
This is because the pile yarn 17 will come out of the needle hole when 7 is cut.

Therefore, in this conventional tuft sewing machine, the base cloth 15 has to be fed in a constant direction from right to left in FIG. 8, so that sewing methods other than straight line sewing are impossible. An object of the present invention is to solve the above-mentioned problems and provide an automatic embroidery sewing machine by tuft sewing in which there is no possibility that the thread will come off even if the cloth is fed in any direction and is sewn. It is to be.

[0008]

In order to solve the above-mentioned problems, the present invention eliminates at least one side of the needle drop portion in the sewing machine bed, and the missing portion has substantially the same height as the sewing machine bed. A support member with a narrow height upper surface is provided to support the cloth and the presser foot, and the pile that hangs from the base cloth is prevented from falling, and an opening is provided in the sewing machine bed for vertical movement of the needle bar. A looper that oscillates in an interlocking manner is provided so as to project above the opening above the sewing machine bed, and with this looper, the pile thread on the side of the sewing machine needle that penetrates the base cloth is scooped out, and the looper is moved to the lower surface of the base cloth that moves with the hoop. After forming the loop, the blade is used to cut a single loop immediately after forming the loop to form a cut pile, and on the bed, slightly higher and narrower than the upper surface of the looper. And a plurality of support members having a surface made to support the fabric and presser foot, and adopt a configuration which is adapted to prevent the collapse of the pile depending from the base fabric.

[0009]

Operation: When the sewing machine needle descends, pierces the base cloth and projects downward, and then the sewing machine needle begins to rise and a loop is formed on the lower surface of the base cloth, the tip of the looper causes the back edge of the needle to squeeze. Scoop a loop while passing.

When the needle and the balance reach the top dead center and the looper reaches the most advanced position, the swing piece operates and the blade cuts the pile yarn. After the pile thread is cut by the cutting blade of the looper and the blade of the rocking piece in this way, the needle and the balance are lowered, so that the thread does not come off.

In the above operation, the pile forming portion of the base cloth is supported by the narrow upper end surface of the supporting member, and the pile formed earlier moves vertically while hanging vertically on the portion without the supporting member. Move in the direction you want to go.

[0012]

EXAMPLE In the example shown in FIG. 1 to FIG.
Is a needle plate provided on the sewing machine bed 20, and a lower part of the bearing is provided with a looper shaft 23 and a blade driving shaft 24 which reciprocally rotate in conjunction with the vertical movement of the needle bar 22. The looper 26 is fixed to the upper end of the arm 25 fixed to the looper shaft 23,
A cutting edge 27 is provided below the looper 26.

A rear end of a swinging piece 31 which is swingably mounted by a shaft 30 on a side surface of a lower part of the looper 26 near the rear side and a blade driving shaft 2
The arm 32 fixed to 4 is connected by a link 33, and the swing piece 3
The blade 34 is fixed to the front side surface of 1.

The shaft 30 is fixed to the side surface of the looper 26 as shown in FIG. 4, and the boss 35 of the swing piece 31 is rotatably fitted to the shaft 30 and is fixed to the outer end of the shaft 30.
A pressing spring 37 is mounted between the rocking piece 31 and the rocking piece 31 in a compressed state.

Further, a guide piece 39 is integrally provided on the upper end of the cutting tool 34, and even if the cutting tool 40 is lowered and the cutting blade 40 is below the cutting blade 27, the guide piece 39 is provided on the side surface of the looper 26. Make sure it is crimped.

The needle plate 21 is semicircular as shown in FIG. 3, and has a notch 29 through which the sewing needle 19 at the lower end of the needle bar 22 penetrates. Further, the cloth presser 42 is fixed to the lower end of the presser frame 41 slidably fitted to the lower part of the needle bar 22. The cloth presser 42 is annular, and the sewing needle 19 moves up and down in the center thereof.

The sewing machine bed 20 is as shown in FIGS.
The base plate 43 is lowered to the left of the needle drop portion of the needle plate 21, and a bar-shaped support member 44 that supports a part of the lower side of the presser foot 42 is fixed on the base plate 43. The upper end of 44 and the upper surface of the needle plate 21 are flush with each other.

The presser frame 41 has the same function as the presser bar of a known sewing machine, and is pressed by the press spring 45.
The needle bar 22 provided on the sewing machine arm 46 moves up and down in conjunction with the up and down movement.

The operation of the above embodiment will be described with reference to FIG. 6. In FIG. 6 (I), the sewing machine needle 19 into which the pile thread 47 is inserted is stretched on a hoop (not shown) to form a base cloth 50.
Through the notch 29 of the needle plate 21 to reach the bottom dead center, and the looper 26 is at the most rear end position.

From this state, the needle 19 begins to rise and the needle 1
When the pile yarn 47 on the side of the needle 9 is slightly bulged, the tip of the looper 26 in the retracted position passes through the edge a of the needle 19 and, as shown in FIG. Scoop up

The looper 26 scooping the pile yarn 47 is shown in FIG.
As shown in (III), it further advances, but at this time, the thicker portion of the looper 26 having a larger cross-sectional area passes while expanding the loop. However, at this time, the supply of the pile yarn 47 is restricted by the action of a balance (not shown), and as a result, the thread tension becomes slightly tight and the seam is properly tightened.

That is, the looper type sewing machine has a sewing needle 19
Since the and the balance perform the same movement, the thread tightening action as described above is performed. Thus, when the sewing machine needle 19 and the balance reach the top dead center as shown in FIG. 6 (IV) and the looper 26 reaches the most advanced position, the pile yarn 47 causes the cutting blade 2
7 and the cutting edge 40 of the cutting tool 34 are put into the state of the maximum tension.

After the above state is reached, the swinging piece 31 moving together with the looper 26 moves with respect to the looper 26, and the blade 34 rises to cut the pile yarn 47 as shown in FIG. 6 (V). After the blade 34 moves and cuts the pile thread 47 as described above, both the sewing machine needle 19 and the balance descend.
The pile yarn 47 is not pulled up, the looper 26 retracts, and the pile yarn 47 does not come off from the base cloth 50 even when the blade 34 falls.

As shown in FIG. 7, the blade 3 of the looper 26
By providing the cutting blade 27 on the 4 side, the length c of the pile yarn 47 hooked on the looper 26 on the opposite side from the cutting blade 27 on the side of the cutting tool 34 becomes longer. That is, the pile yarn 47 on the side of the sewing machine needle 19 becomes long, which prevents the yarn from coming off.

In the embodiment shown in FIGS. 8 to 10, the bed 20 is provided one step lower than the conventional one, and an opening 55 is provided in a portion where the needle plate of the conventional sewing machine is provided. It is a projecting one. And
Instead of the conventional needle plate, like the solid line in FIG. 8 and the chain line in FIG.
Inverted L-shaped support member 56 and a plurality of rod-shaped support members 44
Are provided on both sides of the opening 55, and the upper surfaces of these are not covered by the looper 26.
Almost the same height as the upper surface of the conventional throat plate just above any upper side
As a matter of fact, the presser foot 42 is supported at these upper ends.
9 and instead of the support member 56.
By providing a rod-shaped support member 57 as shown by the solid line in FIG.
Along with the support member 44, a ring-shaped presser foot is supported by a plurality of rods.
It may be received by the holding member.

Instead of the conventional needle plate, an inverted L-shaped support member 56 and a plurality of rod-shaped support members 44 are provided on both sides of the opening, and the upper surfaces of these are slightly above the upper side of the looper 26 and the like. The presser foot 42 is supported at the upper end of the upper surface of the needle plate so as to have the same height as the upper surface of the needle plate.

As shown in FIGS. 9 and 10, the presser foot 4 is pressed.
2 is received by a plurality of rod-shaped support members, as shown in FIG.
Only the looper 26 and the blade 34 face the opening 55, and
The shaft 30, the washer 36, the spring 37, etc. on the lower surface of the bed 20.
Further down to make the opening 55 elongated as shown in FIG.
To bring the support member 57 closer to the other support member 44.
Can be. This embodiment also works in the same way as the first embodiment, but the vertically implanted pile becomes more free and collapses.
Will not be lost.

[0028]

[Effect] According to the present invention, the blade is attached to the swinging piece that moves together with the looper as described above, and when the sewing machine needle after loop formation reaches the top dead center, the blade is operated to cut the loop, so that the loop is formed. Even with just one piece, the cut pile will not come off.

Therefore, it is not necessary to hold a large number of loops in the looper as in the prior art, and the advancing direction of the base cloth can be set freely, so that embroidery sewing of any shape by tufting can be performed.

Further, a part of the cloth presser for pressing the base cloth is supported by the support member having the narrow upper end surface, and most of the lower surface of the cloth is the non-bearing surface. Therefore, since the pile hanging on the lower surface of the base cloth is kept vertical, there is an effect that there is no possibility that the pile falls over during sewing and that it is pierced by the next needle and sewn.

[Brief description of drawings]

FIG. 1 is a partial vertical front view of an embodiment.

FIG. 2 is a partially longitudinal side view of the above.

FIG. 3 is a partially cutaway plan view of the same.

FIG. 4 is an enlarged vertical sectional side view of a main part.

FIG. 5 is a perspective view of the same.

FIG. 6 is a vertical sectional front view of each step showing a cutting pile forming sequence.

FIG. 7 is a vertical sectional side view of a pile-formed state.

FIG. 8 is a partially longitudinal front view of another embodiment.

FIG. 9 is a partially longitudinal side view of the above.

FIG. 10 is a partially cutaway plan view of the same.

FIG. 11 is a partially longitudinal front view of a conventional example.

[Explanation of symbols]

 19 sewing machine needle 20 sewing machine bed 21 needle plate 22 needle bar 26 looper 27 cutting blade 30 shaft 31 swinging piece 34 knife 40 cutting blade 44 supporting member 47 pile thread 50 base cloth 55 opening 56 supporting member

Claims (2)

[Claims] 1. A sewing machine is provided at the bottom of a sewing machine bed with a looper that swings in conjunction with the vertical movement of a needle bar.
Scoop the pile thread on the side of the sewing machine needle that penetrates the base cloth, form a loop on the bottom surface of the base cloth that moves with the hoop, and then use a knife to cut a single loop immediately after forming the loop and cut the pile. At least one side of the needle drop portion in the sewing machine bed is cut off, and a supporting member having a narrow upper end surface having substantially the same height as the sewing machine bed is provided on the missing portion, and A tuft stitch automatic embroidery sewing machine that supports the work clamp and prevents the pile hanging from the base cloth from falling. 2. A sewing machine bed is provided with an opening, and a looper that swings in conjunction with the vertical movement of a needle bar is provided so as to project from the opening above the sewing machine bed. After scooping the pile yarn on the side and forming a loop on the lower surface of the base cloth that moves with the hoop, a single pile immediately after forming the loop is cut with a knife to form a cut pile, Is provided with a plurality of supporting members having a narrow upper end surface slightly higher than the upper surface of the looper to support the cloth and the cloth presser, and to prevent the pile hanging from the base cloth from falling down. sewing machine.