JPH0819615B2 - Tuft stitch automatic embroidery sewing machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an embroidery frame covered with cloth, which is moved in any direction by an automatic control device.
The present invention relates to a tuft stitch automatic embroidery sewing machine capable of sewing a free embroidery pattern using a cut pile on the upper surface of a base cloth.

[0002]

2. Description of the Related Art FIG. 14 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 loop on the left side in FIG. 12, 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 an orderly manner. 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.

For this reason, in this conventional tuft sewing machine, the base cloth 15 must be fed in a constant direction from right to left in FIG. 14, so that sewing methods other than straight line sewing are impossible. The object of the present invention is to solve the above problems and to prevent the thread from slipping out even if the cloth is sent in any direction and is sewn and the pile is formed on the upper part of the base cloth. It is an object of the present invention to provide an automatic embroidery sewing machine by tuft sewing, which can be seen clearly, and the height of the pile can be changed without the pile falling.

[0008]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention is directed to an upward needle bar having an upward sewing needle fixed to the upper end of a lower portion of an automatic embroidery frame which is movable in any direction, and its drive. Means and a ring-shaped cloth receiver for receiving the base cloth stretched on the hoop, and the upper part of the hoop is a looper which swings in conjunction with the vertical movement of the needle bar, and its driving means, On the outside of the looper, a plurality of cloth pressing protrusions for pressing the upper part of the base cloth received by the cloth receiver against the cloth receiver are provided, and a sewing machine needle penetrating the base cloth by the looper is provided on a side part of the looper. After scooping the pile yarn on the side of the, forming a loop on the upper surface of the base fabric that moves with the hoop, and then providing a blade to cut a single loop immediately after the loop formation to make a cutting pile. , Looper And any height position of the tool and the presser foot projection was also employed as the structure capable of adjusting the height of the pile as adjustable.

[0009]

[Function] When the sewing machine needle rises together with the needle bar, pierces the base cloth and projects above it, and then the sewing machine needle begins to descend, a loop is formed on the upper surface of the base cloth, and the tip of the looper is attached to the back surface of the needle. Scoop a loop while passing through the Eguri.

When the lowered needle and the balance reach the bottom dead center and the looper reaches the most advanced position, the blade works to cut the pile yarn. After the pile thread has been cut by the cutting blade of the looper and the blade in this way, the needle and the balance ascend and the thread does not fall out.

In the above operation, since the pile forming portion of the base cloth is only supported by the narrow lower end surface of the cloth pressing protrusion, the pile formed earlier stands upright at the portion without the cloth pressing protrusion. It moves with the base cloth as it is.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment shown in FIGS. 1 and 2, A is an embroidery frame arranged on a sewing machine bed 20, which comprises an outer frame 22 and an inner frame 23. In the illustrated example, similar to a general multi-head type automatic embroidery sewing machine, an automatic control device has an embroidery frame attachment plate 24 that moves back and forth, left and right, and this attachment plate 24 is provided with a plurality of openings for attaching the embroidery frame. The embroidery frame A having the base cloth 25 stretched in advance is attached to the opening, and the embroidery frame A is moved together with the embroidery frame attachment plate 24 to perform embroidery sewing.

Reference numeral 26 is an upper arm fixed to the upper portion of the sewing machine bed 20, and 27 is a lower arm fixed to the lower portion of the bed, and a needle bar 30 is attached to the end portion of the lower arm 27 so as to be vertically movable. The needle bar 30 has a lower shaft 31 driven by a driving means (not shown) attached to the lower arm 27, and drives the lower shaft 31 via a transmission means 32 composed of a link and a crank. The sewing machine needle 33 is fixed to.

Reference numeral 34 denotes an elevating frame which is attached to the needle bar 30 so as to be movable up and down so as not to rotate, and a ring-shaped cloth receiver 35 for receiving the lower surface of the base cloth 25 is provided at the upper end thereof. Pass the cloth through the sewing machine bed 20
An opening 36 into which 5 is inserted is provided.

The elevating frame 34 is movable up and down with respect to the needle bar 30 within a certain range, and a spring 37 for pushing the elevating frame 34 upward is provided.

Reference numeral 40 denotes a looper provided at the end of the upper arm 26. The looper 40 swings around a shaft 41. The shaft 41 is fixed to the upper arm 26, and details thereof are shown in FIGS. 3 to 5.

The looper 40 is fixed to the lower end of an oscillating body 42 having an intermediate portion rotatably attached to a shaft 41. Also, axis 4
1, another swing plate 46 is swingably mounted, and further, a pin 45 at one end of a swing piece 44 swingably mounted on a part of the swing body 42 by a shaft 43 swings on the shaft 41. The oscillating plate 4 is movably attached to the cam hole 47 provided in the oscillating plate 46 so that the oscillating piece 4
A blade 50 is fixed to the other side surface of the blade 4.

The shaft 43 is fixed to the side surface of the rocking body 42 as shown in FIG. 6, and the boss 49 of the rocking piece 44 is rotatably and slidably fitted on the shaft 43 and fixed to the outer end of the shaft 43. A pressing spring 53 is mounted in a compressed state between the washer 52 and the swing piece 44.

Further, a guide piece 54 is integrally provided at the lower end of the blade 50 so that even if the blade 50 rises and the cutting edge 55 is below the cutting edge 39, the guide piece 54 is located on the side surface of the looper 40. Make sure it is crimped.

An upper shaft 51 is rotatably mounted on the upper side of the upper arm 26, and the upper shaft 51 and the lower shaft 31 are interlocked by an appropriate interlocking device such as a bevel gear, a worm gear, and a timing belt.

Reference numerals 60 and 61 denote eccentric discs fixed to the upper shaft 51. Rings 62 and 63 rotatably fitted on the outer periphery of the discs and pins 64 and 65 provided on the oscillator 42 and the oscillator plate 46 are connected to each other by a connecting rod 66. , 67, and the rocking body 42 and the rocking plate 46 are rocked with the rotation of the upper shaft 51.

Since the above-mentioned mechanism changes the rotational movement of the horizontal upper shaft 51 into the oscillating movement of the oscillating body 42 and the oscillating plate 46 about the axis 41 which is orthogonal to the eccentric disc 60. , 61 and the rings 62, 63 are made spherical, or the connecting portions of the pins 64, 65 and the connecting rods 66, 67 are made universal so as to prevent the operating portion from being overloaded.

A cam shaft 56 is rotatably mounted in the upper arm 26, and an eccentric cam 57 at the tip of the shaft 56 raises and lowers an elevating frame 59 in the tip of the upper arm 26.

The elevating frame 59 has a guide portion 6 provided on the rear surface thereof.
9 is mounted between the left and right guide rails 70 as shown in FIG.

A mounting plate 71 at the lower end of the elevating frame 59 is also provided.
3 and 4, an opening 72 into which the looper 40 and the blade 50 are inserted is provided, and a plurality of cloth pressing projections 73 are provided on both sides of the opening 72 so as to face the cloth receiver 35.

The cam shaft 56 is rotated by a manually operated handle at an arbitrary angle to adjust the height position of the presser foot projection 73, and by a stepping motor or the like.
When the position of the pile is adjusted, or the stepping motor is appropriately driven by the automatic control device, the height of the protrusion 73 can be automatically changed to form a three-dimensional pattern having different pile heights.

It should be noted that when the embroidery frame A or the like is replaced, it will be a hindrance if the cloth receiver 35 projects above the bed 20, so that the iron piece 77 is fixed to the elevating frame 34 as shown in FIGS. The arm 27 is provided with an electromagnet 79 for adsorbing the iron piece 77. When the sewing machine is in operation, the electromagnet 79 is demagnetized. When the sewing machine stops operating, the signal from the sensor excites the electromagnet 79 to adsorb the iron piece 77. The cloth receiver 35 may be retracted from the upper surface of the bed 20.

The operation of the above embodiment will be described with reference to FIG. 8. In FIG. 8 (I), the sewing machine needle 33 into which the pile thread 21 is inserted is stretched on the embroidery frame A as shown in FIGS. The base cloth 25 is pierced, and it passes through between the projections 73 upward to reach the top dead center, and the looper 40 is at the most rear end position.

From this state, the needle 33 begins to descend and the needle 3
When the pile yarn 21 on the side of No. 3 is slightly bulged, the tip of the looper 40 in the retracted position passes through the aggression a (FIG. 9) of the needle 33 and passes through the side of the needle 33 as shown in FIG. 8 (II). Scoop up the pile thread 21.

The looper 40 scooping the pile yarn 21 is shown in FIG.
As shown in (III), it further advances, but at this time, the thicker portion of the looper 40 having a larger cross-sectional area passes while expanding the loop. However, at this time, the supply of the pile yarn 21 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, in the sewing machine of this embodiment, the sewing machine needle 33 and the balance perform the same motion, and when the sewing machine needle 33 descends, the balance not shown in the drawing also descends and is inserted into the tip thereof. Since the pile yarn 21 is not loosened, the above-described yarn tightening action is performed. In this way, the sewing needle 3
3 and the balance reach bottom dead center as shown in Fig. 6 (IV), and looper 4
When 0 is at the most forward position, the pile yarn 21 moves to the looper 4
It enters the space between the cutting edge 39 of 0 and the cutting edge 55 of the cutting tool 50, and becomes the most tense state.

After the above state, the swinging piece 44 that was moving together with the looper 40 moves with respect to the looper 40 by the action of the pin 45 of the swinging piece 44 and the cam hole 47 of the swinging plate 46. The blade 50 descends and cuts the pile yarn 21 as shown in FIG. 8 (V). After the cutting tool 50 moves to cut the pile yarn 21 as described above, the sewing machine needle 33 and the balance are both raised, so that the pile yarn 21 is not pulled down.
Even if the looper 40 retracts and the blade 50 rises, the pile yarn 21
Cannot be removed from the base cloth 25.

Incidentally, as shown in FIG. 9, the pile thread 21 applied to the looper 40 by facing the cutting edge 55 of the blade 50 with the cutting edge 39 provided on the looper 40 on the side of the blade 50.
The length c on the opposite side of the cutting blade 35 is longer than the length b on the side of the cutting tool 50. That is, the pile yarn 21 on the side of the sewing machine needle 33 becomes long, which prevents the yarn from coming off.

In the above embodiment, when the cam shaft 56 is rotated to move the elevating frame 59 up and down, the cloth pressing projection 73 moves up and down, and the base cloth 25 and the looper 40 sandwiched by the projection 73 and the cloth receiver 35. The vertical distance of the pile changes, and the height of the pile formed by the looper 40 operating at a fixed position changes.

In the above embodiment, the looper 40 swings at a fixed position and the cloth pressing projection 73 moves up and down.
The embodiment of FIGS. 12 to 12 shows that the height of the looper 40 is changed while keeping the presser foot projection 73 at a constant height.

That is, in FIGS. 11 and 12, a rectangular tube-shaped lifting frame 74 is attached to the front portion of the upper arm 26, and a guide portion 69 at the rear portion thereof is attached between the left and right rails 70 shown in FIG. Ascending and descending freely, and this elevating frame 74 is used for the eccentric cam 5
Use 7 to move up and down.

In the case of this embodiment, the shaft 41 is fixed to the elevating frame 74 so as to move up and down together, and the same device as that shown in FIG. 3 is provided on the shaft 41.

In this embodiment, as shown in FIG. 10, two universal joints B are interposed so that the front portion of the upper shaft 51 can move up and down together with the elevating frame 74.

A mounting plate 75 is provided below the front end of the upper arm 26, the lower parts of the looper 40 and the blade 50 are projected from the openings 76 provided in the mounting plate 75, and a plurality of cloth pressing projections are provided on both sides of the opening 76. 73 is provided.

In this embodiment, the looper 40, the blade 50, and the like move up and down together with the elevating frame 74 that moves up and down by the rotation of the cam shaft 56, and the cloth pressing projection 73 does not move. Is adjusted. In this embodiment as well, the pile forming operation is the same as that shown in FIG.

The embroidery frame A is shown in FIGS. 1, 2 and 10.
In the case of, the base cloth 25 is stretched on the upper side, as shown in FIG.
It may be stretched to the lower portion as in the conventional case. In this case, the receiving edge 2 is placed on the lower inside of the opening of the hoop attachment plate 24.
9 is provided and the hoop A may be placed on it.

[0042]

According to the present invention, since the pile is formed on the base cloth as described above, the pile formation state can be seen well even during sewing. Also, the bottom surface of the base cloth is received by a ring-shaped cloth receiver,
Since the upper portion is only pressed by the plurality of cloth pressing protrusions, the area required for holding the base cloth is extremely small, the function of the base cloth is facilitated, and the formed pile is not likely to be fallen down. Furthermore, since the height of the pile can be freely adjusted, it is possible to obtain a three-dimensional pattern of piles having different heights.

[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 an enlarged vertical sectional front view of a main part.

[Fig. 4] Similarly, a partially cutaway bottom view

FIG. 5 is an enlarged side view of the internal mechanism.

FIG. 6 is an enlarged vertical side view of the blade mounting portion.

FIG. 7 is a perspective view of a looper and a blade.

FIG. 8 is a vertical sectional front view of each step showing the order of forming a cut pile.

FIG. 9 is an enlarged vertical side view of the pile formation state.

FIG. 10 is a partially longitudinal front view of another embodiment.

FIG. 11 is an enlarged vertical sectional front view of the main part of the same.

12 is a cross-sectional bottom view taken along the line II of FIG.

FIG. 13 is an enlarged vertical sectional front view showing another example of the hoop.

FIG. 14 is a partially longitudinal side view of a conventional example.

[Explanation of symbols]

 A Embroidery frame 21 Pile thread 25 Base cloth 30 Needle bar 31 Lower shaft 32 Transmission means 33 Sewing machine needle 35 Cloth receiver 40 Looper 41 Shaft 42 Swing body 44 Swing piece 45 pin 46 Swing plate 47 Cam hole 51 Upper shaft 59 Elevating frame 60 eccentric disc 61 eccentric disc 62 ring 63 ring 66 connecting rod 67 connecting rod 71 mounting plate 73 cloth pressing protrusion 74 lifting frame 75 mounting plate

Claims (3)

[Claims] 1. An upward needle bar having an upward sewing needle fixed to the upper end, a driving means for the needle bar, and a ring shape for receiving a base cloth stretched on the embroidery frame, at the lower part of an automatic hoop which is movable in any direction. A cloth receiver is provided, and a looper that swings in conjunction with the vertical movement of the needle bar and its driving means are provided on the upper part of the hoop, and a base cloth received by the cloth receiver on the outside of the looper. A plurality of cloth pressing projections for pressing the upper part against the cloth receiver are provided, and the looper is provided on the side of the looper to scoop the pile thread on the side of the sewing machine needle penetrating the cloth and move with the hoop. A tuft stitch automatic embroidery sewing machine provided with a blade that forms a loop on the upper surface of the above and then cuts a single loop immediately after the loop formation to form a cutting pile. 2. A plurality of cloth pressing projections are provided on a lower portion of an elevating frame which is attached so that the looper and the blade can be operated at a fixed position and is movable to an arbitrary height with respect to the looper and the blade. The tuft stitch automatic embroidery sewing machine according to claim 1. 3. The tuft sewing according to claim 1, wherein the looper and the blade are attached to an elevating frame which is movable to an arbitrary height, and the plurality of cloth pressing protrusions are provided on a lower portion of an attachment plate in a fixed position. Automatic embroidery sewing machine.