WO2015090112A1 - Presser foot and sewing machine - Google Patents

Abstract

Disclosed is a presser foot and a sewing machine using the presser foot. The presser foot comprises a presser shank (10) detachably connected to a sewing machine, and a presser block (20) fixed at the lower end of the presser shank, wherein a side plate (30) is fixed along the lengthwise direction of a side edge of one side of the presser block, and an outer side face of the side plate has a cutter guide face (31) extending from top to bottom; an edge of the bottom part of the side plate has a curved part (32) curving towards the inside of the bottom face of the presser block, and a guiding channel (40) formed between the curved part and the bottom face of the presser block and extending forwards and backwards along the lengthwise direction of the presser block. The sewing machine has a driving shaft for driving a needle stem to move up and down, a cutter moving synchronously with the needle stem is also detachably mounted on the driving shaft, and the cutter cooperates with the cutter guide face.

Description

 Presser foot and sewing machine

Technical field

The invention relates to the technical field of sewing machine equipment, in particular to a presser foot and a sewing machine for sewing a double-layer fabric and simultaneously removing excess lace.

Background technique

Referring to FIG. 1 , a conventional sewing machine presser foot is provided in the prior art, which has a pressing rod 1 for detachably connecting with a sewing machine, and a pressing block 2 fixed at a lower end of the pressing rod, the front end of the pressing block 2 And the back end is slightly tilted to facilitate feeding. In the sewing machine using the conventional presser foot, when the edge of the double-layer fabric is sewn, for example, the upper layer is a flower-shaped piece having a special tooth on the edge, and when the lower layer is a bud silk yarn, the edge of the lower layer bud yarn needs to exceed the pattern. After the piece is sewn by the presser foot along the edge of the flower-shaped piece, the excess bud yarn of the edge needs to be manually trimmed and removed, which is not only time-consuming and labor-intensive, but also the unevenness of the trim after the trimming is uneven, after the stitching Double-layer fabrics used in ready-to-wear garments (such as bras and underpants) will seriously affect the appearance of the product.

Summary of the invention

In order to overcome the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide a presser foot and a sewing machine for sewing a double-layered fabric and neatly removing excess lace.

In order to achieve the above object, the present invention adopts the following technical solutions:

A presser foot comprising a pressing rod detachably connected to a sewing machine and a pressing block fixed at a lower end of the pressing rod, wherein: one side edge of the pressing block is fixed with a side plate along a length direction, and the side plate The outer side surface has a cutter guiding surface extending from the top to the bottom; the bottom edge of the side panel has a bent portion bent toward the inner side of the bottom surface of the pressing block, the bent portion and the pressing block Guide channels extending forward and backward along the length direction of the compact are formed between the bottom surfaces.

Preferably, a portion of the bottom surface of the pressing block corresponding to the guiding passage has a groove extending forward and backward along the length direction, and the bent portion is located in the groove.

More preferably, the bottom surface of the bent portion is slightly higher than the bottom surface of the compact. The height difference between the bottom surface of the bent portion and the bottom surface of the pressing block is less than or equal to 1 mm.

In a specific embodiment, the front portion of the compact has an arcuate transition surface extending from a front end of the guide passage to a side of the other side of the compact.

The front and rear ends of the side plate respectively have a connecting portion fixedly connected to the pressing block. The connecting portion and the compact are connected by welding.

The invention also provides a sewing machine using the above-mentioned presser foot, the sewing machine having a drive shaft for driving the needle bar to move up and down, wherein the drive shaft is detachably mounted with a cutting action synchronously with the needle bar a knife that cooperates with the cutter guide surface.

Compared with the prior art, the present invention has the following advantages: when the sewing machine with the presser foot is used for the seaming of the double-layer fabric, the upper flower-shaped panel is separated from the lower-layer bud yarn by the bent portion of the side panel, The upper flower pattern piece is fed through the guiding channel of the presser foot, and the lower layer bud wire yarn is fed from the bottom surface of the presser foot and the bottom surface of the side part of the side plate. When the stitching is performed, the cutter moves up and down synchronously with the needle bar, and the cutting blade is along the side plate. The cutting edge of the cutter guides the lower edge of the lower bud silk yarn to ensure that the slit is smooth and round; and the presser foot can prevent the cutter from damaging the teeth of the upper flower pattern piece, and ensure that the double layer cloth has the seam after the seam Uniform mouth; using the presser foot and sewing machine of the invention, the production efficiency is greatly improved, the labor intensity caused by manual trimming is reduced, and the problem of uneven edge cut of the flower piece caused by manual work is improved.

DRAWINGS

FIG. 1 is a schematic structural view of a conventional presser foot of the prior art.

Figure 2 is a perspective view of the presser foot of the present invention at a first viewing angle.

Figure 3 is a perspective view of the presser foot of the present invention in a second set of viewing angles.

Figure 4 is a front elevational view of the presser foot of the present invention.

Figure 5 is a bottom plan view of the presser foot of the present invention.

Figure 6 is a schematic view showing the operation of the presser foot of the present invention when it is used in a sewing machine.

detailed description

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

1 to 5, a presser foot includes a press bar 10 detachably coupled to a sewing machine, and a press block 20 fixed to a lower end of the press bar 10, and a side edge of the press block 20 is fixed with a side plate 30 along a length direction thereof. The outer side surface of the side plate 30 has a cutter guiding surface 31 extending from the top to the bottom; the bottom edge of the side panel 30 has a bent portion 32 bent toward the inner side of the bottom surface of the pressing block, and the bending portion 32 and the pressing portion A guide passage 40 extending forward and backward along the longitudinal direction of the clamp 20 is formed between the bottom surfaces of the blocks 20. The bottom surface of the pressing block 20 corresponding to the portion of the guiding passage 40 has a groove 21 extending forward and backward in the longitudinal direction, and the bent portion 32 is located in the groove 21. The bottom surface of the bent portion 32 is slightly higher than the bottom surface of the press block 20. When the side plate 30 is attached, the difference in height between the bottom surface of the bent portion 31 and the bottom surface of the press block 20 is less than or equal to 1 mm.

In the present embodiment, the front portion of the pressing block 20 has an arc-shaped transition surface 22 extending from the front end of the guiding passage 40 toward the other side of the pressing block 20, so as to facilitate the upper sewing pattern when starting the sewing. The teeth are placed in the guide channel 40.

The front end of the side plate 30 has a front connecting portion 33 which is welded to the front end surface of the pressing block 20. The rear end of the side plate 30 has a rear connecting portion 34, and the rear connecting portion 34 is welded to the upper end surface of the rear end of the pressing block 20.

As shown in FIG. 5, in the present embodiment, the bent portion 31 of the side plate 30 has a front portion width greater than a rear portion width along the longitudinal direction of the press block 20. The front edge of the bent portion 31 has an arcuate transition.

Referring to FIG. 6, the present invention further provides a sewing machine using the above-mentioned presser foot, the sewing machine having a drive shaft (not shown) for driving the needle bar up and down, the drive shaft being detachably mounted and The cutter 50 is synchronized with the cutter 50, and the cutter 50 is engaged with the cutter guide surface 31 of the side plate 30.

When the sewing machine is used for sewing the upper layer of the flower-shaped panel 61 and the lower layer of the double-layer fabric 60 which is the bud yarn 62, the flower-shaped panel 61 is separated from the bud yarn 62 by the bent portion 32 of the side panel 30. The edge of the upper flower pattern piece 61 is fed through the guide channel 40 of the presser foot, and the flower teeth are protected under the blockage of the side plate 30 to avoid being cut by the cutter 50. The lower layer of bud yarn 60 is fed from the bottom surface of the pressing block 20 and the bottom surface of the bent portion 32 of the side plate 30, and the cutter 50 is moved up and down in synchronization with the needle bar during sewing (the direction of the arrow in Fig. 6), and the cutting blade 50 is along When the cutter guide surface 31 of the side plate 30 is cut downward, the excess edge of the lower layer bud yarn 62 is cut off to make the slit smooth and round.

By adopting the presser foot and the sewing machine of the invention, the production efficiency is greatly improved, the labor intensity of manual trimming is reduced, and the defects of uneven and uneven lace edges caused by manual work are improved.

The above embodiments are only intended to illustrate the technical idea and the features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention. Equivalent changes or modifications made to the spirit of the spirit should be covered by the scope of the present invention.

Claims (8)

 1. A presser foot comprising a pressing rod detachably connected to a sewing machine and a pressing block fixed at a lower end of the pressing rod, wherein: one side edge of the pressing block is fixed with a side plate along a length direction, and the side plate The outer side surface has a cutter guiding surface extending from the top to the bottom; the bottom edge of the side panel has a bent portion bent toward the inner side of the bottom surface of the pressing block, the bent portion and the pressing block Guide channels extending forward and backward along the length direction of the compact are formed between the bottom surfaces. 2. A presser foot according to claim 1, wherein a bottom surface of the pressing block corresponding to the guiding passage has a groove extending forward and backward in the longitudinal direction, and the bent portion is located in the groove Inside. 3. A presser foot according to claim 2, wherein the bottom surface of the bent portion is slightly higher than the bottom surface of the compact. 4. A presser foot according to claim 3, wherein a difference in height between the bottom surface of the bent portion and the bottom surface of the press block is less than or equal to 1 mm. 5. A presser foot according to any one of claims 1 to 4, characterized in that the front portion of the press block has an arc extending from the front end of the guide passage toward the other side of the press block Shape transition surface. 6. A presser foot according to any one of claims 1 to 4, characterized in that the front and rear ends of the side plates each have a connecting portion fixedly connected to the pressing block. 7. A presser foot according to claim 6, wherein the connecting portion is connected to the press block by welding. A sewing machine using the presser foot according to claim 1, wherein the sewing machine has a drive shaft that drives the needle bar to move up and down, wherein the drive shaft is detachably mounted with a cutter, the cut The knife cooperates with the cutting surface of the cutter.