JPH0713346B2 - Tuft 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 sewing machine capable of sewing a free embroidery pattern by a cutting pile by freely changing the cloth feeding direction or an embroidery frame covered with cloth.
Driven by an automatic control device,
The present invention relates to an automatic embroidery sewing machine that sewes embroidery patterns with il .

[0002]

2. Description of the Related Art FIG. 8 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 rises, the pile yarn 17
Becomes a loop and is locked by the looper 6, the base cloth 15 is fed by one pitch by the feed dog 11, and the looper 6 returns.

With the above operation, the base portion of the looper 6, that is, the loop on the left side in FIG. 8 is cut by the vertical movement of the blade 10 to form a cut pile when the looper 6 has a plurality of loops arranged in order. It moves with the cloth 15.

[0007]

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 must be fed in a constant direction from the right side to the left side in FIG. 8, so that a sewing method other than the straight line sewing is impossible. An object of the present invention is to solve the above problems and to provide a tuft sewing machine in which the thread does not come off even if the cloth is sent in any direction and is sewn.

[0009]

In order to solve the above-mentioned problems, the present invention sandwiches a loop made of pile yarn hooked on a looper and cuts a single loop immediately after forming the loop with a knife. In addition, a loop holding piece that prevents the cut loop from coming off from the base cloth is rotatably attached to the side surface of the looper, or is scooped on the looper between the needle plate of the sewing machine and the lower looper. Even if a single loop immediately after loop formation is cut with a knife, sandwiching the broken loop, a structure that has a pair of openable loop holding pieces that prevents the cut loop from coming off the base cloth is adopted. did.

[0010]

In the first aspect of the invention, when the sewing machine needle descends and pierces the base cloth and projects downward, the looper scoops the pile yarn on the side of the sewing machine needle. Then the sewing needle rises,
At the same time when the loop is formed on the lower surface of the base cloth, the loop holding piece works to hold the loop by sandwiching it with the looper and the loop holding piece, and at the same time when the cloth moves one pitch and the sewing machine needle starts descending. When the base cloth is pierced, the blade moves and cuts the loop.

Further, in the case of the second aspect of the invention, when the sewing machine needle descends and pierces the base cloth and projects downward, the looper scoops the pile yarn on the side portion of the sewing machine needle. Next, the sewing machine needle rises to form a loop on the lower surface of the base cloth, and at the same time, the pair of loop holding pieces closes and holds the loop between the looper and the sewing machine needle, and then the cloth moves one pitch. At the same time when the sewing machine needle starts to descend, or when the sewing machine needle pierces the base cloth, the blade moves to cut the loop, and immediately after that, the holding piece opens and the sewing machine needle passes between them.

After that, when the looper scoops the pile yarn on the side portion of the sewing machine needle and the sewing machine needle rises, the pair of holding pieces are closed and the loop is held as in the previous case.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment shown in FIG. 1, 21 is a needle plate provided on a sewing machine bed 20, and a lower part thereof has a looper shaft 23 and a blade shaft 24 which reciprocally rotate in conjunction with the vertical movement of a needle bar 22.
And three of the loop holding piece drive shafts 25 are arranged. A looper 27 is attached to the upper end of the arm 26 fixed to the looper shaft 23.
Is fixed, and a cutting blade 29 is provided below the looper 27.

The arm 30 fixed to the tool shaft 24 has a tool 31
And the cutting blade 29 of the looper 27.
Thus, the loop locked by the looper 27 is cut.
Reference numeral 32 denotes a loop holding piece provided at the tip of the swinging piece 33 having an inverted L shape, which is attached to the vicinity of the base of the looper 27 by a shaft 34 so as to be swingable in the vertical direction.

The loop holding piece drive shaft 25 is for driving the holding piece 32. One end of the link 37 is rotatably connected to a piece 36 provided on a part of the outer circumference of the loop holding piece drive shaft 25.
3, the holding piece 32 is rotated by the reciprocating rotation of the shaft 25 so that the looper 2
Open and close for 7.

In addition, in the figure, 40 is a sewing machine needle, 41 is a needle insertion hole provided in the needle plate 21, 42 is a presser bar, 43 is a presser foot, and 44 is a base cloth stretched on an embroidery frame not shown. <br/> Ah is, thereby interlocking the embroidery frame to the automatic control device
Allows you to automatically sew embroidery patterns.

If the blade 31 is kept in contact with the portion of the cutting blade 29 of the looper 27 by a spring or the like, the position of the blade 31 is stabilized.

In the case of the above-mentioned embodiment, as shown in FIG. 3 (I), the sewing machine needle 40 in which the pile thread 45 is inserted penetrates the base cloth 44 and penetrates the insertion hole 41 of the needle plate 21, and is slightly raised to raise the needle 40.
When the pile yarn 45 on the side of the swells slightly, the looper 27 in the retracted position moves toward the needle 40, and the looper 27 moves to the position shown in FIG.
Scoop the pile yarn 45 on the side of the needle 40 as shown in FIG.

Next, as shown in FIG. 3 (III), when the needle 40 is pulled out onto the needle plate 21 and the base cloth 44, the pile yarn 45 retained by the looper 27 remains as a loop a, and at the same time, the loop holding piece 32. Is operated and the loop a is sandwiched and held by the looper 27 and the holding piece 32.

Next, as shown in FIG. 3 (IV), the base cloth 44 is advanced one pitch in an arbitrary direction, the looper 27 is also returned to its original position while the loop a is sandwiched, and the needle 40 pierces the base cloth 44. Pass through.

In this state, as shown by the chain line in FIG. 3 (IV), the blade 31 is lifted and looped by the looper 27.
The blade 31 is then lowered, and the holding piece 32 is shown in FIG.
It opens like (V) and the next loop formation begins. Figure 4
In the embodiment shown below, the loop is held by a pair of openable and closable loop holding pieces 46 and 47 provided between the looper 27 and the needle plate 21.

In this embodiment, the arm 26 is fixed to the looper shaft 23 as in FIG. 1, and the looper 27 is fixed to the arm 26. 50 is a rotary shaft of the sewing machine and is fully rotatable.
Three eccentric discs 51, 52, 53 are fixed to 0 as shown in FIG. In addition to this, another axis that is linked to the sewing machine is provided.
With the eccentric discs 51, 52, 53 by a cam provided on the shaft,
There are cases where the same operation is performed.

Reference numeral 55 is a vertical shaft fixed to the lower surface of the sewing machine bed 49, and upper and lower arms 56 and 57 which swing separately are attached to the shaft 55. The pins 59 and 60 fixed to the side portions of the bosses of the upper and lower arms 56 and 57 and the eccentric disc 5
Rings 61 and 62, which are rotatably fitted to the outer circumferences of 1 and 52, are connected by connecting rods 63 and 64.
Each arm 56, 57 is configured to swing.

Since the above mechanism changes the horizontal rotary motion into the vertical rotary motion, the sliding surfaces of the eccentric discs 51, 52 and the rings 61, 62 are made spherical, and the pins 59, 60 are made.
And the connecting portions of the connecting rods 63 and 64 are made universal so as not to overload the operating portion. 65 is bed 4
The above-mentioned loop holding piece 46 and the movable blade mounting base 67 are separately swingably attached by another vertical shaft fixed to the lower surface of 9.

One end of the holding piece 46 and the arm 56 and the mounting base 67 and the arm 57 are connected by connecting rods 70 and 71, respectively, so that the movements of the arms 56 and 57 are transmitted to the holding piece 46 and the mounting base 67. To do.

Reference numeral 72 in FIGS. 4 and 5 denotes a fixed blade mounting base, which is screwed to the lower surface of the bed 49 and has a tip as a loop holding piece 47 facing the loop holding piece 46, and a fixed blade 73 on the lower surface. It is screwed on. Further, as shown in FIG. 5, the mounting base 67 has its boss rotatably and vertically movable on the shaft 65, and a spring 75 on the receiving plate 74 at the lower end of the shaft 65 applies an upward force to the mounting base 67. In addition.

An arm 76 fixed to the movable tool mount 67
The movable blade 77 is fixed to the tip of the blade, and the blade 77 slides while pressing the lower surface of the fixed blade 73 with the force of the spring 75. A ring 54 rotatably fitted to the outer periphery of the eccentric disc 53 and an arm 69 fixed to the looper shaft 23 as shown in FIG. 6 are connected by a connecting rod 79, and the looper shaft 23 is reciprocated by the rotation of the hook shaft 50. It is configured to rotate.

In the case of the above embodiment, the looper 27 is retracted as shown in FIG. 7 (I), and the loop holding pieces 46, 4 are provided as shown in FIG.
7 is opened and the movable blade 77 is retracted as shown in FIG.
As shown in (I), the sewing machine needle 40 in which the pile thread 45 is inserted penetrates the base cloth 44 and penetrates the insertion hole 41 of the needle plate 21,
When the pile thread 45 on the side of the needle 40 is slightly raised and bulges a little, the looper 27 in the retracted position moves toward the needle 40 and the pile on the side of the needle 40 is moved as shown in FIG. 7 (II). Thread 4
Scoop 5

Next, as shown in FIG. 7 (III), when the needle 40 is pulled out onto the needle plate 21, the pile yarn 45 locked by the looper 27.
Remains as a loop a, and at the same time, the loop holding piece 46 operates to reach the position indicated by the chain line in FIG. 4, and the holding pieces 46 and 47 sandwich and hold the loop a.

Next, as shown in FIG. 7 (IV), the looper 27 is returned to its original position while holding the loop a between the holding pieces 46 and 47, and at the same time, the movable blade 77 works in the direction of the arrow in FIG. After cutting into a cut pile, the base cloth 44 is advanced in an arbitrary direction, then the sewing machine needle 40 is lowered,
At the same time when the needle 40 is pierced, the holding pieces 46 and 47 are opened, and the needle 40 passes between the holding pieces 46 and 47.
As in (V), the next loop forming process starts.

[0031]

According to the present invention, the loop holding piece is attached to the looper as described above, or the openable and closable loop holding piece is provided separately from the looper, so that the loop is held by the holding piece until the loop is cut by the blade. Therefore, it is not necessary to hold many loops in the looper as in the conventional case. Therefore, the advancing direction of the base cloth can be freely set, and embroidery sewing of any shape can be performed.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a first embodiment.

FIG. 2 is an enlarged perspective view of a looper portion of the above.

FIG. 3 is a vertical cross-sectional side view of each step showing the same loop forming order as above.

FIG. 4 is a partially cross-sectional bottom view showing a second embodiment.

FIG. 5 is a vertical sectional view taken along the line AA of the above.

6 is a sectional view taken along line BB of FIG.

FIG. 7 is a vertical cross-sectional side view of each step showing the order of forming a loop in the above.

FIG. 8 is a vertical sectional side view of a conventional example.

[Explanation of symbols]

 20 sewing machine bed 21 needle plate 22 needle bar 27 looper 31 knife 32 loop holding piece 40 sewing needle 44 base cloth 45 pile thread 46 loop holding piece 47 loop holding piece 49 sewing machine bed 73 fixed knife 77 movable knife

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.
In a tuft sewing machine that scoops the pile yarn on the side of the sewing machine needle that penetrates the base cloth and forms a loop on the lower surface of the base cloth, then cut the loop with a blade to make a cut pile,
A loop holding piece that prevents the cut loop from coming off from the base cloth even if a single loop immediately after loop formation is cut with a knife while sandwiching a loop made of pile yarn hooked on the looper, A tuft sewing machine rotatably attached to the side surface of the looper. 2. Even if a loop cut by the looper is sandwiched between the needle plate of the sewing machine and the looper under the loop and the single loop immediately after the loop is formed is cut with a blade, the cut loop is The tuft sewing machine according to claim 1, wherein a pair of openable and closable loop holding pieces are provided so as not to come off from the base cloth.