TWI503462B - Presser foot of sewing machine - Google Patents

Description

Presser foot structure of sewing machine

The invention relates to a presser foot structure of a sewing machine, in particular to a presser foot structure which avoids wrinkles after the sewing of the cloth surface and maintains a good suture quality.

Conventional sewing machine presser foot structure, the pressure of the presser foot pressing the cloth surface is mostly constant, so when pressing the elastic fabric and the mesh fabric with different thickness or different material, the pressing force of the presser foot cannot be obtained properly. Adjustment. Since the presser foot cannot properly adjust the pressing force to position the cloth surface, the cloth surface tension is often too large or too small, so that the feed dog can not reliably pull the cloth to face forward, so after the sewing, the cloth surface often produces unevenness and Wrinkles cause poor stitch quality.

In order to effectively adjust the pressing force of the pressing foot, the prior art has developed a sewing machine capable of coaxially releasing the linear pressing mechanism and the pressing foot pressure control mechanism, such as the Patent No. 447534 of the Republic of China, which discloses a sewing machine linear pressing mechanism and Pressing foot pressure control mechanism, the patent control shaft of the suture tension adjusting device is arranged to be horizontally movable along the direction of pressing or releasing the suture to achieve the purpose of simultaneously releasing or pressing the suture pressure; The end of the control shaft is further provided with a line pressure release device, so that the cloth foot is actuated and the control shaft and the thread tension adjusting device are directly linked to release or restore the tension against the respective sutures.

However, in the above patent, the overall control of the suture tension mechanism with the suture pressure release The system is a complicated structure, which is not only difficult to manufacture, but also has a high overall structure cost, which needs to be improved.

In view of the above, the present inventors have made great efforts to study and cooperate with the application of the theory, and finally propose a present invention which is reasonable in design and effective in improving the above-mentioned defects.

It is an object of the present invention to provide a presser foot structure for a sewing machine which avoids wrinkles after the seam is sewn to maintain good sewing quality.

An object of the present invention is to provide a presser foot structure of a sewing machine, which is characterized in that the elastic pressing piece is used to adjust the pressing force of the elastic cloth and the mesh fabric which are different in the thickness of the cloth surface or the material. Maintain proper pressure to position the fabric.

In order to achieve the above object, the present invention is a presser foot structure of a sewing machine, comprising a presser foot and an elastic pressing piece. The presser foot comprises a fixing seat and a main pressing plate extending forward from a bottom surface of the fixing seat, and the elastic pressing piece The longitudinal extension extends along the main pressure plate, and the elastic pressing piece has opposite fixed ends and free ends. The fixed end is coupled to the presser foot, and the free end is located at the bottom surface of the main pressure plate and is in a free state.

Another object of the present invention is to provide a presser foot structure of a sewing machine which has a simple structure and is easy to manufacture, which not only reduces the overall cost of the product, but also has good suture quality.

Compared with the prior art, the presser foot structure of the sewing machine of the invention has the advantages of simple structure and low cost, and mainly combines the elastic pressing piece on the presser foot table, and extends the longitudinal direction to the bottom surface of the main pressure plate to be in a free state. When the sewing cloth is fed into the bottom surface of the main pressure plate, the elastic pressing piece is pressed and is to be sewn to facilitate the sewing; since the elastic pressing piece can be evenly treated Sewing the cloth, so that no excessive pressure is applied to the sewing cloth, so that the sewing thread with good quality is sewn; in addition, since the elastic pressing piece is pressed, it will be flat with the movable pressing plate. The average pressure is used to maintain a good positioning of the sewing cloth, and the utility of the invention is further enhanced.

1, 1a‧‧‧ presser foot structure

2‧‧‧Pressure rod

3‧‧‧Sitting sewing cloth

4‧‧‧Car plane

5‧‧‧Sewing needle

10, 10a, 10b, 10c‧‧‧ foot press

11, 11a, 11b, 11c‧‧‧ fixed seat

12, 12a, 12b, 12c‧‧‧ main pressure plate

120‧‧‧ pinhole

13‧‧‧Bend

130‧‧‧Combination hole

131‧‧‧ oblique block

14, 14', 14c‧‧‧ active platen

15‧‧‧ Spring

20, 20a‧‧‧ elastic tablet

200‧‧‧through slot

21, 21a‧‧‧ fixed end

22, 22a‧‧‧Free end

23‧‧‧Deduction Department

230‧‧‧Perforation

24‧‧‧ screws

The first figure is one of the three-dimensional appearance diagrams of the presser foot structure of the sewing machine of the present invention; the second figure is the second perspective view of the presser foot structure of the sewing machine of the present invention; the third figure is a three-dimensional exploded view of the presser foot structure of the sewing machine of the present invention. The fourth drawing is a two-dimensional exploded view of the presser foot structure of the sewing machine of the present invention; the fifth drawing is a schematic view of the presser foot structure of the sewing machine of the present invention; and the sixth figure is the use of the presser foot structure of the sewing machine of the present invention. 7 is a second embodiment of the presser foot structure of the sewing machine of the present invention; the eighth figure is another embodiment of the presser foot of the sewing machine of the present invention; and the ninth drawing is the presser foot of the sewing machine of the present invention. Another embodiment of the station.

The detailed description and technical content of the present invention are set forth in the accompanying drawings.

Please refer to the first and second figures, which are schematic perspective views of the presser foot structure of the sewing machine of the present invention; the present invention provides a presser foot structure 1 for a sewing machine, comprising a presser foot 10 and being fixed to the presser foot 10 An elastic sheet 20 on top. The presser foot 10 is coupled with a presser bar 2 that drives the presser foot 10 to move up and down.

Referring to the third and fourth figures, a perspective exploded view of the presser foot structure of the sewing machine of the present invention; the presser foot 10 includes a fixing base 11 and a main pressing plate extending forward from the bottom surface of the fixing base 11. In the present embodiment, the front end of the main pressure plate 12 extends with a bent portion 13 having a diagonal block 131 extending outwardly. The inclined block 131 is provided with a coupling hole 130.

Preferably, the presser foot 10 further includes at least one movable platen 14 that is movably connected to a side of the main platen 12 by a spring 15, and the movable platen is provided by the spring 15 14 The movable position can be adjusted on the side of the main pressure plate 12 to compress the sewing cloth (not shown).

In the present embodiment, the presser foot 10 includes a pair of movable pressure plates 14, 14' which are symmetrically disposed on two sides of the main pressure plate 12. In actual implementation, the presser table 10, a movable platen 14 may be disposed only on a single side of the main platen 12, or the presser foot table 10 may not be provided with any movable platen 14, and only the main platen 12 is pressed against the sewn cloth. It should be noted that the bottom surface of the movable platen 14 , 14 ′ is slightly lower than the bottom surface of the main pressure plate 12 (please refer to the second figure). Therefore, when the sewing machine to be sewn passes from the bottom surface of the main pressure plate 12 , The pair of movable platens 14, 14' will be adjusted according to the thickness of the sewing cloth to be provided, thereby providing appropriate pressure and space to facilitate the sewing work.

Furthermore, the elastic pressing piece 20 extends longitudinally along the main pressing plate 12, and the elastic pressing piece 20 has an opposite fixed end 21 and a free end 22, and the fixed end 21 is coupled to the pressing table 10. The free end 22 is in a free state on the bottom surface of the main pressure plate 11.

In this embodiment, the fixed end 21 is coupled to the main pressure plate 12, in more detail The manner in which the fixed end 21 is combined is as follows. The elastic pressing piece 20 has a fastening portion 23 which is bent and extended toward the oblique block 131 of the main pressure plate 12. The fastening portion 23 is provided with a through hole 230, and the fastening portion 23 is fastened to the inclined block 131. The through hole 230 is correspondingly located at the coupling hole 130 of the oblique block 131. Finally, a screw 24 is used, and the fixed end 21 of the elastic pressing piece 20 is coupled to the main body by the locking of the screw 24. The bent portion 13 of the pressure plate 12 is placed.

It is worth mentioning that the main pressure plate 12 is provided with a pinhole 120, which is arranged for a sewing needle to pass through. The elastic pressing piece 20 extends at least to the position of the pinhole 120, and the elastic pressing piece 20 is provided with at least one through groove 200 corresponding to the position of the pinhole of the main pressing plate 12; accordingly, when the elastic pressing piece 20 is pressed When the crucible is pressed, the elastic pressing piece 20 moves toward the main pressing plate 12 to fit the adjacent portion of the pinhole 120 to press the sewing cloth adjacent to the pinhole 120.

Referring to FIG. 5 and FIG. 6 again, FIG. 5 is a schematic view showing the pressing structure of the presser foot of the sewing machine of the present invention and a schematic view of the use thereof; the presser foot structure of the sewing machine of the present invention is used for pressing a sewing machine 3 to be sewn. . The sewing cloth 3 can be any material such as cotton cloth, elastic cloth or mesh fabric. The sewing machine 3 is placed on a platform 4 of the sewing machine, and the pressing table 10 is driven by the pressing foot 2 to be positioned above a distance of the plane 4 of the platform; in addition, a sewing needle 5 is positioned Above the pinhole 120 of the main platen 12, at this time, the elastic pressing piece 20 is naturally suspended between the main platen 12 and the to-be-sewn cloth 3.

When the presser foot 2 drives the presser foot 10 to move downward, the free end 22 of the elastic pressing piece 20 will be flat against the sewing cloth 3, and the sewing cloth 3 is pressed. At this time, the sewing needle 5 is aligned with the pinhole 120 of the main pressing plate 12 and the through slot 200 of the elastic pressing piece 20. The sewing cloth 3 can be fed into the bottom surface of the main pressing plate 12 by the elastic pressing. Piece 20 The pressure is pressed to facilitate the sewing.

Please refer to the seventh figure, which is a second embodiment of the presser foot structure of the sewing machine of the present invention; the embodiment is substantially the same as the first embodiment, the presser foot structure 1a of the sewing machine comprises a presser foot 10a and is fixed at the pressure An elastic pressing piece 20a on the footrest 10a. The presser foot 10a includes a fixing base 11a and a main pressing plate 12a extending forward from the bottom surface of the fixing base 11a. The elastic pressing piece 20a extends longitudinally along the main pressing plate 11a. The elastic pressing piece 20a has an opposite fixed end 21a and a free end 22a. The fixed end 21a is coupled to the pressing table 10a. The end 22a is in a free state on the bottom surface of the main pressure plate 11a.

The difference between the embodiment and the first embodiment is that the fixed end 21a of the elastic pressing piece 20a is coupled to the fixing seat 21a of the elastic pressing piece 20a. In the embodiment, the fixing end 21a is coupled to the fixing seat. On the rear side of the 11a, the free end 22a extends forward in the direction of the main platen 11a.

Referring to FIG. 8 again, it is another embodiment of the presser foot of the sewing machine of the present invention; in this embodiment, the presser foot 10b includes a fixing seat 11b and a front extending from the bottom surface of the fixing seat 11b. The main platen 12b differs from the previous embodiment in that the presser foot 10b is not provided with any movable platen, and the width of the main platen 12b is substantially equal to the width of the fixed seat 11b.

Referring to FIG. 9 again, it is a further embodiment of the presser foot of the sewing machine of the present invention. In this embodiment, the presser foot 10c includes a fixing base 11c and a front extending from the bottom surface of the fixing base 11c. The main pressing plate 12c is different from the previous embodiment in that the pressing table 10c is provided with a movable pressing plate 14c only on one side of the fixing base 11c, and the other side of the fixing seat 11c is laterally extended. To the fixed seat 11b The sides are the same width.

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the invention, and other equivalent variations of the patent spirit of the present invention are all within the scope of the invention.

2‧‧‧Pressure rod

3‧‧‧Sitting sewing cloth

4‧‧‧Car plane

5‧‧‧Sewing needle

10‧‧‧Foot table

12‧‧‧Main plate

120‧‧‧ pinhole

20‧‧‧Elastic compression tablets

22‧‧‧Free end

Claims (8)

A presser foot structure of a sewing machine, comprising: a presser foot, comprising a fixing seat, a main pressing plate extending forward from a bottom surface of the fixing seat; and at least one movable pressing plate, wherein the at least one movable pressing plate is disposed on the main pressing plate a side edge, and a bottom surface of the movable platen is lower than a bottom surface of the main pressure plate; and an elastic pressing piece extending longitudinally along the main pressure plate, the elastic pressing piece has an opposite fixed end and a free end, The fixed end is coupled to the presser foot, and the free end is in a free state on the bottom surface of the main pressure plate. The presser foot structure of the sewing machine of claim 1, wherein the fixed end is coupled to the main platen. The presser foot structure of the sewing machine according to claim 2, wherein a front end of the main pressure plate extends with a bent portion, and the fixed end is coupled to the bent portion. The presser foot structure of the sewing machine of claim 3, wherein the bent portion has an oblique block extending outwardly, the inclined block is provided with a coupling hole, and the elastic pressing piece has a bending and extending direction toward the oblique block. a fastening portion, the fastening portion is provided with a through hole, and the fastening portion is fastened to the oblique block, and the through hole is correspondingly located at the coupling hole. The presser foot structure of the sewing machine of claim 1, wherein the fixed end is coupled to the fixing base. The presser foot structure of the sewing machine according to claim 5, wherein the fixed end is coupled to a rear side of the fixing seat, and the free end extends forward toward the main pressing plate. The presser foot structure of the sewing machine of claim 1, wherein the presser foot platform comprises a pair of movable pressure plates, and the pair of movable pressure plates are symmetrically disposed on two sides of the main pressure plate. The presser foot structure of the sewing machine of claim 1, wherein the main pressure plate is provided with a pinhole, and the elastic pressing piece extends at least to the pinhole position to fit the pinhole, and the elastic pressing piece corresponds to the main body. At least one through slot is formed in the pinhole position of the pressure plate.