WO2019101033A1

WO2019101033A1 - Sewing machine and bird's nest prevention device thereof, and sewing machine presser foot

Info

Publication number: WO2019101033A1
Application number: PCT/CN2018/116154
Authority: WO
Inventors: 姜进元; 李志朝
Original assignee: 强信机械科技(莱州)有限公司
Priority date: 2017-11-27
Filing date: 2018-11-19
Publication date: 2019-05-31

Abstract

A sewing machine and a bird's nest prevention device thereof, and a sewing machine presser foot. The bird's nest prevention device comprises a line hooking component (2), a driving member, a mounting frame assembly (4), a first connecting rod (5), a line hooking connecting plate (6), a second connecting rod (7) and an air suction pipe (8); the driving member comprises a driving member body and a driving rod, the driving member body being mounted on the mounting frame assembly (4); a first end of the first connecting rod (5) is hinged to the mounting frame assembly (4); a second end of the first connecting rod (5) is hinged to a first end of the line hooking connecting plate (6), and the tail part of the line hooking component (2) is mounted on a second end of the line hooking connecting plate (6); two ends of the second connecting rod (7) are respectively hinged to the middle part of the first connecting rod (5) and the driving rod; the air suction pipe (8) is mounted on the mounting frame assembly (4) and located below the line hooking connecting plate (6), the line hooking component (2) can move along the top wall of the air suction pipe (8), ends of the line hooking component (2) have hook-shaped portions (22) for hooking lines, and the pipe port of the air suction pipe (8) is arranged toward the hook-shaped portions (22). Connecting a cylinder (3) with the line hooking component (2) by means of a connecting-rod connection method can ensure that the line hooking component (2) outputs blades quickly and the position of blade outputting is stable. A semicircular blade (3') is arranged inside the sewing machine presser foot, being able to ensure smooth and stable line cutting, reducing blade wearing, and having short cut threads.

Description

Sewing machine and its anti-bird nest device, sewing machine presser foot

This application is submitted to the Chinese Patent Office on November 27, 2017, the application number is 201721609145.7, the invention name is “sewing machine and its anti-bird nest device”, and the Chinese Patent Office is submitted to the Chinese Patent Office on June 26, 2018, and the application number is 201102989118.5. The priority of the two Chinese patent applications of "a sewing machine presser foot" is incorporated herein by reference.

Technical field

The present invention relates to the field of sewing equipment, and in particular to a sewing machine, a bird nest prevention device thereof, and a sewing machine presser foot.

Background technique

Sewing is an important processing procedure for products such as garments and hats. Sewing equipment is usually required in the sewing process. The sewing machine is also called a flat car. It is a kind of sewing machine. It mainly uses a sewing thread to form a kind on the sewing material. Stitch, which makes one or more layers of sewing material intertwined or stitched. It is usually divided into two types: thin material and thick material. The flat sewing machine can sew cotton, hemp, silk, wool, rayon and other fabrics as well as leather and plastic. Paper and other products, thin materials are generally used for knitting, underwear, shirts, uniforms, etc., thick materials are generally used in all kinds of sportswear, jeans, fashion, coats, shoes and hats, leather, luggage and so on. The bird's nest phenomenon refers to the situation where the upper thread is left on the presser foot surface and the bottom thread appears at the beginning of the stitching machine, which seriously affects the appearance of the product and the quality of the sewing. In order to avoid the bird nest, it is usually necessary to use the anti-bird nest phenomenon. Bird's nest device.

At present, the market anti-bird nest device is equipped with a wire grabbing device on the side, which has a slightly larger structure and affects the operation. The speed of catching lines is slow, which affects work efficiency.

In addition, the sewing machine presser foot is an indispensable part in the feeding mechanism of the sewing machine. Various types of sewing machine presser foot play an important role in the production process, such as sewing machine pressure for the slash line and the hidden zipper. Foot, pleating sewing machine presser foot, etc. It is very important to use different sewing machine presser feet in different sewing operations.

The applicant has previously disclosed a flat sewing machine anti-bird nest device by the publication number CN105544098A, and specifically discloses that a shallow groove is arranged in the middle of the presser foot bottom plate, and a round knife is embedded in the shallow groove, and between the two presser feet of the presser foot bottom plate A slit through which the suture thread can be inserted is provided, and a circumferential edge of the circular knife covers a part of the slit. However, there is still room for improvement in this structure: the gap through which the suture thread penetrates is located on the side of the two toe stitches with the bottom surface of the presser foot, so that the thread entry is not smoothly smoothed, and in the round knife, the circle where the cutting thread actually acts is occupied by the circle. A small part of the knife occupies a large area of the bottom plate of the presser foot, which causes waste of the processing technology. Also, the stitch line transmitted from the gap meets the front side of the blade of the round knife, and the action of the broken line is "cut". The force required for "cutting" is greater and the round knife wears faster.

Summary of the invention

SUMMARY OF THE INVENTION A primary object of the present invention is to provide an anti-bird nest device for a sewing machine which has a small structure and a fast thread catching speed.

Another object of the present invention is to provide a sewing machine having the above-described bird nest prevention device for a sewing machine.

In order to achieve the above main object, the present invention provides an anti-bird nest device for a sewing machine, comprising a wire hook component, a driving component, a mounting frame assembly, a first connecting rod, a wire hooking plate, a second connecting rod and an air suction tube; the driving component comprises a driving body and a driving rod, the driving body is mounted on the mounting frame assembly; the first end of the first connecting rod is hinged with the mounting frame assembly; the second end of the first connecting rod is hinged with the first end of the wire hooking plate, the line The second end of the hooking plate is installed at the tail end of the hook component; the two ends of the second link are respectively hinged with the middle of the first link and the driving rod; the suction pipe is mounted on the mounting frame assembly and located below the wire hook component, the driving component The drive line hook member moves along the top wall of the suction duct, and the end portion of the hook member has a hook portion for the hook line, and the nozzle of the suction duct is disposed toward the hook portion.

Another object of the present invention is to disclose a sewing machine presser foot that overcomes the deficiencies of the prior art, and the technical solution adopted is:

A sewing machine presser foot comprising a presser foot bottom plate and a presser foot hinge hinged to the presser foot bottom plate, the presser foot bottom plate comprising a left toe and a left toe, wherein the left toe and the left toe are provided with a stitch seam, wherein: a line slot on the bottom plate of the presser foot, on which the seam line passes, a through-line groove that communicates with the needle slit and smoothly transitions, and a shallow groove in the middle of the presser foot bottom plate, the shallow groove A half ring blade is placed inside, and a pressure plate is placed on the half ring blade.

Compared with the prior art, the present invention improves the original anti-bird's nest presser foot, and changes the cutting position of the blade from the original intermediate position to the side, and changes to cut, and changes the original cross-line groove from the original side to the original side. The center position ensures smooth and stable secant cut, reduces blade wear and has a short secant line.

In order to achieve the above other object, the present invention provides a sewing machine comprising a sewing machine head and an anti-bird nest device for a sewing machine, wherein the anti-bird nest device for the sewing machine is mounted on one side of the sewing machine head, wherein the anti-bird nest device for the sewing machine is as described above The anti-bird nest device of the sewing machine; or / and the sewing machine presser foot described above.

It can be seen from the above scheme that the connection of the cylinder and the wire hook component by the link type connection method ensures that the wire hook component is quickly cut out and the cutting position is stable. In addition, the wire hook component is separated from the presser foot for easy installation and easy replacement.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a structural schematic view showing the state in which the wire hook member of the embodiment of the anti-bird nest device for a sewing machine of the present invention is not cut out.

Fig. 2 is a structural schematic view showing the first angle of the state in which the wire hook member of the embodiment of the anti-bird nest device for a sewing machine of the present invention is cut.

Fig. 3 is a structural view showing the second angle of the state in which the wire hook member of the embodiment of the anti-bird nest device for a sewing machine of the present invention is cut.

Figure 4 is a partial enlarged view of a portion A in Figure 3.

Figure 5 is a schematic view showing the structure of the presser foot of the sewing machine of the present invention.

Figure 6 is a schematic view showing the structure of the presser foot bottom plate of the present invention.

Fig. 7 is a structural schematic view showing another perspective of the presser foot plate of the present invention.

Figure 8 is a schematic view showing the structure of a semi-annular blade of the present invention.

Figure 9 is a schematic view showing the structure of a presser blade of the present invention.

Figure 10 is a schematic view showing the structure of the presser foot of the present invention.

Detailed ways

Referring to Fig. 1, the sewing machine of the present embodiment includes a sewing machine head 1, a presser foot 12, and a thread cutting mechanism. The anti-bird nest device of the sewing machine is mounted on one side of the sewing machine head 1. The birdproof nest device includes a wire hook member 2 and a driving member. The mounting frame assembly 4, the first link 5, the wire hooking plate 6, the second link 7, and the suction duct 8. The bird nest device is fixedly mounted on the sewing machine head 1 by a mounting frame assembly 4.

The driving member includes a driving body and a driving rod. Preferably, the driving member is a cylinder 3, the driving member body is a cylinder body 31, and the driving rod is a piston rod 32. The driving body is mounted on the mounting frame assembly 4, the first end of the first connecting rod 5 is hinged with the mounting bracket assembly 4, and the second end of the first connecting rod 5 is hinged with the first end of the wire hooking plate 6, the first connection The rod 5 is a curved rod whose central portion is curved away from the side of the cylinder 3, and the first end of the first link 5 is located above the second end of the first link 5 in the Z direction. The end of the hook member 2 is mounted at the second end of the hooking plate 6, the end of the second link 7 is hinged to a position near the middle of the first link 5, and the other end of the second link 7 is hinged to the piston rod 32.

Referring to Figures 2 and 3, the mounting bracket assembly 4 includes a first mounting bracket 41, a second mounting bracket 42 and a third mounting bracket 43 that are fixedly coupled in sequence. The first mounting bracket 41 is fixed to the sewing machine head 1, and the cylinder housing 31 Fixed to the third mounting frame 43, the first end of the first link 5 is hinged to the third mounting frame 43.

The first mounting frame 41 is further provided with two first strip-shaped openings 412 extending in the Y direction. Two first threaded holes 11 are defined in the sewing machine head 1 at positions corresponding to the first strip-shaped openings 412. The first screw (not shown) sequentially passes the first screw hole 412 and the first strip opening 412 to fix the first mounting bracket 41 to the sewing machine head 1.

The first mounting bracket 41 is provided with two second strip-shaped openings 411 extending in the X direction, and the second mounting bracket 42 is provided with two second threaded holes at positions corresponding to the second strip-shaped openings 411 ( Not shown), the second screw (not shown) sequentially connects the first mounting bracket 41 and the second mounting bracket 42 through the second threaded hole and the second strip opening 411.

The second mounting frame 42 defines two third strip-shaped openings 421 extending in the Z direction. The third mounting bracket 43 defines a third threaded hole 431 at a position corresponding to the third strip-shaped opening 421. The three screws sequentially connect the second mounting bracket 42 to the third mounting bracket 43 through the third threaded hole 431 and the third strip-shaped opening 421. The cylinder 3, the first link 5, the wire hooking plate 6, the second link 7, and the suction pipe 8 are adjusted by adjusting the positional relationship between the first mounting frame 41, the second mounting frame 42, and the third mounting frame 43. The location of the space.

The tail portion of the hook member 2 is provided with a through hole 21, and the second end of the hooking plate 6 has a connecting portion 61 perpendicular to the longitudinal direction of the hook member 2, and the connecting portion 61 is inserted into the through hole 21.

The suction pipe 8 is mounted on the mounting frame assembly 4 and located below the wire hook member 2. The top wall of the suction pipe 8 is provided with a guiding groove 81 extending in the longitudinal direction of the hook member 2, and the cylinder 3 driving line The hook member 2 moves along the guide groove 81. The end of the hook member 2 has a hook portion 22 for the hook line. When the hook member 2 is in the initial state, that is, when the hook member does not protrude from the guide groove 81, the nozzle 82 of the suction duct 8 It is disposed toward the hook portion 22.

The first mounting portion 911 and the limiting portion 912 are fixed to the mounting bracket assembly 4, and the first fixing portion 911 is fixedly connected to the third mounting bracket 43. The seat portion 912 is located above the guide groove 81 and extends along the guide groove 81, and the stopper portion 912 abuts against the wire hook member 2. The suction pipe 8 is provided with a second pressure spring 92. The second pressure spring 92 includes a second fixing portion 921 and a pressing portion 922 which are perpendicular to each other. The second fixing portion 921 is fixedly connected to the suction pipe 8 to apply pressure. The portion 922 abuts on the limiting portion 912. An end of the limiting portion 912 adjacent to the hook portion 22 has an arcuate portion 9121. The curved portion 9121 is recessed into the groove 81. The pressing portion 922 is provided with an abutting portion 9221 at a position corresponding to the curved portion 9121. a gap is formed between the pressing portion 922 and the limiting portion 912, the abutting portion 9221 is bent toward the limiting portion 912 side, and the abutting portion 9221 guides the curved portion 9121 into the groove 81, thereby the wire hook member 2 is restricted in the guide groove 81, and an excessive force is not applied to the hook member 2 to cause the hook member 2 to be blocked.

Next, the operation of the anti-bird nest device for a sewing machine of the present embodiment will be described as follows.

After the sewing is completed, the thread is cut by the thread cutting mechanism. When the presser foot 12 has not been lifted, the piston rod 32 of the cylinder 3 drives the second link 7 to swing, and the second link 7 drives the first link 5 to swing. A link 5 drives the wire hooking plate 6 to swing, and the wire hook member 2 is fixedly connected with the wire hooking plate 6, and the wire hook member 2 moves along the guiding groove 81 to the presser foot 12 under the driving of the wire hooking plate 6, The hook of the upper thread is hooked by the hook portion 22 and then returned to the initial position, and the air suction tube 8 sucks the thread end and the sewing machine starts normal sewing.

It can be seen from the above scheme that the anti-bird nest device for the sewing machine connects the cylinder and the wire hook component by means of a link type connection, which can ensure that the wire hook component is quickly cut out and the cutting position is stable. In addition, the wire hook component is separated from the presser foot for easy installation and easy replacement.

Furthermore, the present invention also provides a sewing machine presser foot, referring to FIG. 5 to FIG. 10, the sewing machine presser foot comprises a presser foot bottom plate 1', and a presser foot handle 2' hinged with the presser foot bottom plate, the presser foot bottom plate 1' includes a left toe 1 '1 and a left toe 1 '2, and a stitch 1'3 is disposed between the left toe 1 '1 and the left toe 1 '2, wherein the presser foot base 1' An extension line of the stitch 1'3 is provided with a through-line crossing, a threaded groove 1'4 communicating with the needle slit 1'3 and smoothly transitioning, and a rounded rectangle is arranged in the middle of the presser foot bottom 1' a shallow groove 1'5, a bottom of the rounded rectangular shallow groove 1'5 is provided with a semicircular shallow groove 1'6, a chord of the semicircular shallow groove 1'6 and the rounded rectangular shallow groove 1'5 One long side coincides, the crossing groove 1'4 intersects the arc of the semicircular shallow groove 1'6; the semicircular shallow groove 1'6 is built into the semicircular ring 3', the rounded corner The rectangular shallow groove 1'5 is built in a press plate 4' that presses against the half ring blade 3'. A wire groove 2'1 is provided at the corner of the presser foot 2' of the wire passing groove 1'4.

Of course, the sewing machine necessarily includes the sewing machine head, the anti-bird nest device for the sewing machine and the presser foot. At the same time, the above-mentioned anti-bird nest device and the presser foot are used, and the technical effect of the sewing machine is better.

It should be noted that the above embodiments are only for explaining the present invention and are not intended to limit the technical solutions described in the present invention. Although the present specification has been described in detail with reference to the above embodiments, those skilled in the art It should be understood that the invention may be combined with, modified, or equivalently substituted by those skilled in the art without departing from the spirit and scope of the invention. .

Claims

An anti-bird nest device for a sewing machine, comprising: a wire hook component, a driving component, a mounting frame assembly, a first connecting rod, a wire hooking plate, a second connecting rod and an air suction pipe;

The driving member includes a driving body and a driving rod, the driving body is mounted on the mounting assembly, and the first end of the first connecting rod is hinged with the mounting assembly, the first connecting rod The second end is hinged with the first end of the wire hooking plate, the tail of the wire hook component is mounted at the second end of the wire hooking plate, and the two ends of the second link are respectively connected with the first link The middle portion and the drive rod are hinged;

The suction duct is mounted on the mounting bracket assembly and located below the wire hook member, and the driving member drives the wire hook member to move along a top wall of the suction pipe, the wire hook component The end has a hook for the hook line, the nozzle of the suction duct being disposed towards the hook.
The anti-bird nest device for a sewing machine according to claim 1, wherein:

The mounting bracket assembly includes a plurality of mounting brackets fixedly connected in sequence, and the driving member body is fixed to one of the mounting brackets.
The anti-bird nest device for a sewing machine according to claim 2, wherein:

One of the two adjacent mounting brackets is provided with a strip-shaped opening, and the other of the mounting brackets is provided with a threaded hole at a position corresponding to the strip-shaped opening, and the fasteners are sequentially Two adjacent mounting brackets are fixedly coupled together through the threaded bore and the strip opening.
The anti-bird nest device for a sewing machine according to any one of claims 1 to 3, characterized in that:

A through hole is defined in a tail portion of the wire hook component, and a second end of the wire hooking plate is inserted into the through hole.
The anti-bird nest device for a sewing machine according to any one of claims 1 to 3, characterized in that:

A guide groove is defined in the top wall of the suction pipe, the guide groove extends in a length direction of the wire hook member, and the driving member drives the wire hook member to move along the guide groove.
The anti-bird nest device for a sewing machine according to claim 5, wherein:

a first pressure spring piece is disposed on the mounting frame assembly, the first pressure spring piece includes a first fixing portion and a limiting portion that are perpendicular to each other, and the first fixing portion is fixedly connected to the mounting frame assembly. The limiting portion is located above the guiding groove and extends along the guiding groove, and the limiting portion abuts on the wire hook member.
The anti-bird nest device for a sewing machine according to claim 6, wherein:

The suction pipe is provided with a second pressure spring piece, and the second pressure spring piece includes a second fixing portion and a pressing portion perpendicular to each other, and the second fixing portion is fixedly connected with the suction pipe. The pressing portion abuts on the limiting portion.
The anti-bird nest device for a sewing machine according to claim 7, wherein:

One end of the limiting portion adjacent to the hook portion has an arc portion, and the arc portion is recessed into the guiding groove, and one end of the pressing portion is provided with an abutting portion, and the abutting portion The curved portion is pushed into the guide groove.
The anti-bird nest device for a sewing machine according to any one of claims 1 to 3, characterized in that:

The driving member is a cylinder, the driving member body is a cylinder body, and the driving rod is a piston rod.
A sewing machine presser foot comprising a presser foot bottom plate (1'), a presser foot handle (2') hinged to the presser foot bottom plate, the presser foot bottom plate (1') comprising a left toe (1'1) and a left toe ( 1'2), a needle slit (1'3) is disposed between the left toe (1'1) and the left toe (1'2), characterized in that: the presser foot bottom plate (1'), the The extension line of the needle slit (1'3) is provided with a suture line crossing, a wire groove (1'4) communicating with the needle slit (1'3) and smoothly transitioning, on the presser foot plate (1' a shallow groove (1'6) is disposed in the middle portion, a semi-annular blade (3') is placed in the shallow groove (1'6), and a pressing blade (4' is placed on the semi-annular blade (3') ).
A sewing machine presser foot according to claim 10, characterized in that: in the middle of the presser foot bottom plate (1'), a rounded rectangular shallow groove (1'5) is provided, and the rounded rectangular shallow groove (1'5) The shallow groove (1'6) is provided at the bottom, the shallow groove (1'6) is a semicircular ring shape, the chord of the shallow groove (1'6) and the rounded rectangular shallow groove (1'5) One of the long sides coincides, and the presser plate (4') is placed in the rounded rectangular shallow groove (1'5).
A sewing machine presser foot according to claim 10, wherein a wire groove (2'1) is provided at a corner of said presser foot (2') facing said wire passing groove (1'4) .
A sewing machine comprising a sewing machine head and a birdproof nesting device for a sewing machine, wherein the sewing machine is mounted on one side of the sewing machine head with an anti-bird nest device, wherein the sewing machine anti-bird nest device is according to any one of claims 1 to The anti-bird nest device for a sewing machine according to the invention; or/and the sewing machine further comprising the sewing machine presser foot according to any one of claims 10 to 12.