TWI580836B - Flat car sewing machine sewing elastic fabric body - Google Patents

Description

Flat sewing machine sewing elastic fabric mechanism

The invention relates to a needle plate and a presser foot of a sewing machine, in particular to a needle plate and a presser foot which are applied to a flat sewing machine and respectively have a tongue.

With the development of textile technology, a variety of functional fabrics have been developed. In the case of elastic fabrics, elastic fabrics are widely used in warm clothing, cool sensibilities or women's underwear that are worn close to the body, and their highly extended characteristics give people a comfortable feeling.

However, the high-extensibility characteristics of the elastic fabrics previously revealed that the existing sewing machines cannot be sewn. In the case of a flat sewing machine, in the process of sewing work, a yarn is guided by a bur to form a loop with a bottom thread, and the loop is formed on the cloth surface. However, the existing flat sewing machine forms a fixed amount of the yarn loop, and the thread amount thereof is set to the sewing machine to the fabric which does not have elastic function. Once the sewing elastic function fabric, the amount of the small loop yarn will cause the elastic functional fabric to be affected by the stitching. The effect is to shrink into a strip shape, which causes the original flat fabric to have a strip-like contraction, which obviously affects the appearance after the seam. Therefore, the existing sewing machine manufacturers do not implement the sewing of the elastic fabric by the flat sewing machine, but as the design of the clothing changes, this is a problem that cannot be underestimated and needs to be improved.

The main object of the present invention is to solve the problem that the conventional flat sewing machine cannot be sewn elastic fabric.

In order to achieve the above object, the present invention provides a sewing machine elastic sewing mechanism for a flat sewing machine, comprising a needle plate, a presser foot bearing carrying a presser foot and being driven to drive the presser foot to perform a reciprocating stroke with respect to the needle plate. And a needle shaft that carries a needle and is driven to drive the needle to perform a sewing stroke with respect to the needle board, the needle board has a pair of needle projection positions to provide the needle to the seam Retrieving a first lower needle region therein, and at least one lower needle tongue disposed in the first lower needle region, the presser foot having a pair of first lower needle regions to be opened and providing the needle a second lower needle region in which the sewing stroke is reciprocally shuttled, and at least one upper needle tongue disposed in the second lower needle region and corresponding to the lower latch tongue, the lower latch tongue having a first face facing the presser foot a plane and a first guiding slope extending from the first plane and extending away from the presser foot, the first guiding oblique mask having a positive slope, the upper tongue having a second plane facing the needle plate and a Connecting the second plane and facing a second guiding inclined surface extending from the needle plate direction, the second guiding oblique mask has a negative slope, and the upper locking tongue is in contact with the lower locking tongue in the reciprocating stroke, and the first guiding inclined surface and the first guiding inclined surface The second guiding slope increases the amount of thread of a loop.

In an embodiment, the upper latch is disposed on a side of the second lower needle region facing the presser foot and the presser foot shaft, and the lower latch is disposed at a projection position corresponding to the upper latch The first lower needle area.

In one embodiment, the lower latch is assembled to the needle plate by a separate member, the needle plate having a first mounting slot in the first lower needle region for providing the lower latch assembly, the upper latch is The presser foot is assembled as a separate member having a second mounting slot in the second lower needle region that provides assembly of the upper latch.

In an embodiment, the lower latch is integrally formed by the needle plate, and the upper latch is integrally formed by the presser foot.

In one embodiment, the needle plate has a plurality of lower latches, and any two of the lower latches are spaced apart by a pitch, the presser foot having a plurality of upper latches, and wherein the upper latches are spaced apart by the spacing, and each One of the upper latches respectively corresponds to one of the lower latches.

In one embodiment, the lower latch has a third plane parallel to the first plane and coupled to the first guiding ramp, the upper latch having a second plane parallel to the second plane and the second guide The fourth plane that connects the slopes.

The above technical solution has the following features compared with the conventional technology: the upper body and the lower needle are respectively disposed on the presser foot and the needle plate, and the upper and lower needles are in the middle of the sewing process. At the moment of the tongue contact, the yarn guided by the needle will be wound around the upper tongue and the lower needle to form a loop, and the loop amount of the loop is more than that of the conventional upper and lower latches. In the process of sewing the elastic fabric of the sewing machine, the increase of the amount of the yarn loop can make the elastic fabric not have the problem that the compressed cloth surface is strip-shaped after the sewing.

1‧‧‧ needle board

11‧‧‧First needle area

12‧‧‧lower tongue

121‧‧‧ first plane

122‧‧‧First guiding bevel

123‧‧‧ third plane

13‧‧‧First installation slot

2‧‧‧Pressure foot shaft

21‧‧‧Foot presser

211‧‧‧Second lower needle area

212‧‧‧Upper tongue

213‧‧‧ second plane

214‧‧‧Second guiding bevel

215‧‧‧Second installation slot

216‧‧‧fourth plane

3‧‧‧needle shaft

31‧‧‧ burs

4‧‧‧ yarn loop

5‧‧‧Flexible fabric

Figure 1 is a schematic view showing the structure of an embodiment of the present invention.

2 is a schematic structural view of a portion of a head of an embodiment of the present invention.

3 is a schematic view showing the structure of a presser foot and a needle plate according to an embodiment of the present invention.

4-1 is a schematic view (1) of a continuous sewing machine according to an embodiment of the present invention.

4-2 is a schematic view of a continuous sewing machine (2) according to an embodiment of the present invention.

4-3 is a schematic view (3) of a continuous sewing of a vehicle according to an embodiment of the present invention.

Figure 5-1, the finished sewing diagram of the sewing elastic fabric of the sewing machine sewing machine.

Fig. 5-2 is a completed sewing diagram of the sewn elastic fabric of the present invention.

Fig. 6 is a structural schematic view showing a presser foot and a needle plate according to another embodiment of the present invention.

Fig. 7 is a structural schematic view (I) of a presser foot and a needle plate according to another embodiment of the present invention.

Figure 8 is a structural schematic view of a presser foot and a needle plate according to another embodiment of the present invention (2).

The detailed description and technical contents of the present invention will now be described with reference to the following drawings: Referring to FIG. 1 and FIG. 2, the present invention provides a sewing elastic sewing mechanism for a flat sewing machine, wherein the flat sewing machine can also be called a zigzag car or a person. The invention is provided in the position of the machine head, and has a needle plate 1, a presser foot shaft 2 and a needle shaft 3, wherein the presser foot shaft 2 carries a presser foot 21, the presser foot The shaft 2 is driven by a drive link (not shown) to reciprocate the presser foot 21 relative to the needle plate 1. The yoke shaft 3 carries a yoke 31, and the yoke shaft 3 The stylus 31 is driven by the drive link to perform a sewing stroke with respect to the needle plate 1.

Referring to FIG. 3 to FIG. 4-1, the needle board 1 of the present invention has a pair of first needle area 11 in which the projection position of the needle 31 is opened to provide reciprocal shuttle of the needle 31 in the sewing stroke. And at least one lower latch 12 disposed in the first lower needle region 11, the presser foot 21 having a pair of first lower needle regions 11 to be opened and providing the stylus 31 to reciprocate during the sewing stroke The second lower needle region 211 therein and at least one upper needle 212 disposed in the second lower needle region 211 and corresponding to the lower needle tongue 12. More specifically, the lower latch 12 has a first plane 121 facing the presser foot 21 and a first guiding ramp 122 that connects the first plane 121 and extends away from the presser foot 21 . The first plane 121 has a horizontal height equal to the horizontal height of the needle plate 1. The first guiding slope 122 is away from the end of the first plane 121 away from the end edge of the first lower needle region 11. The foot 21 extends in the direction. On the other hand, the upper latch 212 has a second plane 213 facing the needle plate 1 and a second guiding ramp 214 that connects the second plane 213 and extends away from the needle plate 1. The second plane 213 is located at an opposite bottom edge of the presser foot 21, the horizontal height of which is equal to the horizontal height of the bottom edge of the presser foot 21, and the second guiding slope 214 is away from the second plane 213. One side of the end edge of the second lower needle region 211 extends away from the needle plate 1 direction. Further, the upper latch 212 is disposed on a side of the second lower needle region 211 facing the presser foot 21 and the presser foot shaft 2, and the lower latch 12 corresponds to the projection of the upper latch 212 The position is set in the first lower needle region 11. In one embodiment, the lower latch 12 is assembled to the needle plate 1 as a separate member. The needle plate 1 has a first mounting groove 13 for providing the lower latch 12 in the first lower needle region 11. . The upper latch 212 is also assembled to the presser foot 21 by a separate member. The presser foot 21 has a second mounting slot 215 for providing the upper latch 212 in the second lower needle region 211. Further, the lower latch 12 can be assembled on the needle plate 1 in a screwed manner, and the upper latch 212 can also be screwed onto the presser foot 21 . In addition, in an embodiment, the lower latch 12 may be integrally formed by the needle plate 1, and the upper latch 212 is integrally formed by the presser foot 21.

Referring to FIG. 4-1, the first guiding slope 122 of the lower latch 12 of the present invention has a positive slope, and the second guiding slope 214 of the upper latch 212 has a negative slope. When the upper latch 212 contacts the lower latch 12 during the reciprocating stroke, the first guiding ramp 122 and the second guiding ramp 214 together form a wire tapered structure, and the wire tapered structure Increase the amount of thread of a loop 4. Referring to FIG. 4-1 to FIG. 4-3, more specifically, the stylus 31 is in the process of performing the sewing stroke, and the upper needle 212 is simultaneously with the lower needle at the moment of the lower needle of the stylus 31. The wire 12 is in contact with the second lower needle region 11 and the second lower needle region 211 to form the wire tapered structure, and a yarn guided by the needle 31 is connected to a bottom line, and The loop 4 is formed on the wire tapered structure, and the loop 4 is continuously driven by the sewing operation to be separated from the thin end of the tapered structure of the wire to complete the sewing of the stage. Referring to FIG. 5-1 and FIG. 5-2, as shown in the figure, in the process of the sewing operation, the lower needle tongue 12 and the upper needle tongue 212 are provided with the wire tapered structure. Increasing the amount of wire when the loop 4 is formed, so that when the present invention sewn an elastic fabric 5, the The amount of wire added by the yarn loop 4 can specifically avoid the ductility of the elastic fabric 5 itself, and after the sewing is completed, the thread amount of the loop 4 is too short and the problem that the compressed cloth surface is strip-shaped occurs.

The slope of the first guiding slope 122 and the second guiding slope 214 of the present invention may be adjusted according to the amount of line to be increased. For example, when the amount of line is to be increased compared to the starting line amount, The slope of the first guiding slope 122 and the second guiding slope 214 may be increased, and the tapered structure of the wire formed by the first guiding slope 122 and the second guiding slope 214 may be expanded. On the other hand, if the amount of the line is to be reduced by the amount of the line compared to the initial line amount, the slope of the first guiding slope 122 and the second guiding slope 214 is decreased, so that the first guiding slope 122 and the second guiding The tapered structure of the wire formed by the slope 214 is relatively slender. Referring to FIG. 6 , in an embodiment, the lower latch 12 further has a third plane 123 parallel to the first plane 121 and connected to the first guiding slope 122 . The upper latch 212 has A fourth plane 216 parallel to the second plane 213 and coupled to the second guiding ramp 214. In this embodiment, the stylus 31 guides the yarn to form the position of the loop 4, and may also be in the third plane 123 and the fourth plane 216, and then the loop 4 is driven by the sewing operation. The first guiding slope 122 is disengaged from the second guiding slope 214. Thereby, a greater amount of wire is produced than the amount of wire added to the tapered structure of the wire.

According to the present invention, the lower latch 12 and the upper latch 212 can be implemented in multiple numbers, and the number can be adjusted according to the needle stitch requirement, as shown in FIGS. 7 and 8. Further, when the needle plate 1 has a plurality of the lower latches 12, any of the lower latches 12 will be spaced apart by a pitch which will be appropriately adjusted according to the requirements of the sewing operation. The number of the upper latches 212 on the presser foot 21 corresponds to the number of the lower latches 12, and any two of the lower latches 12 are also spaced apart by the spacing, and each of the upper latches 212 is respectively associated with one of them. The lower latch 12 corresponds. Furthermore, the lower latches 12 or the upper latches 212 can be respectively formed on a latching piece, as shown in FIG. 3, FIG. 7 and FIG. 8, the design of the latching tongue can be simplified. The setting of the latch 12 or the upper latches 212. Furthermore, the present invention The lower latch 12 and the upper latch 212 can also change the thickness of the loop 4 by respectively adjusting the thickness of the loop 4 .

The present invention has been described in detail above, but the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Variations and modifications are still within the scope of the patents of the present invention.

1‧‧‧ needle board

11‧‧‧First needle area

12‧‧‧lower tongue

13‧‧‧First installation slot

2‧‧‧Pressure foot shaft

21‧‧‧Foot presser

211‧‧‧Second lower needle area

212‧‧‧Upper tongue

215‧‧‧Second installation slot

Claims (6)

The utility model relates to a sewing elastic sewing mechanism for a flat sewing machine, comprising a needle plate, a presser foot bearing carrying a presser foot and being driven to drive the presser foot to perform a reciprocating stroke with respect to the needle plate, and a bearing needle and receiving a needle shaft for driving the needle to perform a sewing stroke with respect to the needle board, wherein the needle board has a pair of needle projection positions to provide the needle to reciprocate in the sewing stroke Shuttleing a first lower needle region therein, and at least one lower latch disposed in the first lower needle region, the presser foot having a pair of first lower needle regions to be opened and providing the bur during the sewing stroke Reciprocatingly shuttles a second lower needle region therein, and at least one upper latch disposed in the second lower needle region and corresponding to the lower latch, the lower latch having a first plane facing the presser foot and a connection The first plane and the first guiding slope extending away from the presser foot, the first guiding oblique mask has a positive slope, the upper tongue has a second plane facing the needle plate and a connecting the second Plane and away from the needle board An extended second guiding slope having a negative slope, the upper tongue contacting the lower tongue in the reciprocating stroke to jointly use the first guiding slope and the second guiding slope Increase the amount of wire in a loop. The sewn elastic sewing mechanism of the flat sewing machine according to claim 1, wherein the upper latch is disposed on a side of the second lower needle region facing the presser foot and the presser shaft. The lower latch is disposed in the first lower needle region corresponding to the projected position of the upper latch. The sewn elastic sewing mechanism of the flat sewing machine according to claim 1 or 2, wherein the lower latch is assembled to the needle plate by a separate member, the needle plate having a provided in the first lower needle region The lower needle set A first mounting slot is mounted, the upper latch being assembled to the presser foot by a separate member, the presser foot having a second mounting slot in the second lower needle region for providing the upper latch assembly. The sewn elastic sewing mechanism for a flat sewing machine according to claim 1 or 2, wherein the lower latch is integrally formed by the needle plate, and the upper latch is integrally formed by the presser foot. The sewn elastic sewing mechanism for a flat sewing machine according to claim 1, wherein the needle plate has a plurality of lower latches, and the lower latches are spaced apart by a pitch, the presser foot having a plurality of upper latches. Any two of the upper latches are spaced apart by the spacing, and each of the upper latches respectively corresponds to one of the lower latches. The sewn elastic sewing mechanism of the flat sewing machine according to claim 1 or 5, wherein the lower latch has a third plane parallel to the first plane and connected to the first guiding slope, The latch has a fourth plane that is parallel to the second plane and that is coupled to the second guide ramp.