CN221167024U - Little bird nest movable knife and sewing machine thread cutting mechanism - Google Patents

Abstract

The utility model provides a movable knife with less bird nest and a thread cutting mechanism of a sewing machine, which comprises a movable knife body, wherein the movable knife body is provided with a seam lifting thread cutting edge, a first knife clamp thread part, a seam lifting thread hooking groove and a seam lifting thread passing groove, the seam lifting thread cutting edge and the seam lifting thread cutting edge are shared thread cutting edges, the first knife clamp thread part is arranged on the surface of the movable knife body and is used for clamping an upper thread head, and the seam lifting thread hooking groove and the seam lifting thread passing groove are both used for allowing a needle in the sewing machine to pass. When the needle passes through the needle-lifting thread-hooking groove, the needle is firstly used for leading the upper thread end to the lower part of the movable knife with less bird nest, then the first knife-holder thread part is used for clamping the upper thread end, the needle is used for moving up and down at the position of the needle-lifting thread-passing groove, after the needle number is set for the needle number for lifting, the upper thread end is cut by the thread-lifting cutting edge, thereby preventing the upper thread end from winding to form the bird nest and effectively avoiding the upper thread from falling off during the lifting. When the sewing is finished and the thread is cut, the upper thread and the bottom thread are cut by the cutting edge of the thread after sewing.

Description

Little bird nest movable knife and sewing machine thread cutting mechanism

Technical Field

The utility model relates to the technical field of sewing machines, in particular to a movable knife with less bird nest and a thread cutting mechanism of a sewing machine comprising the movable knife with less bird nest.

Background

The lockstitch sewing machine is a sewing machine capable of forming lockstitch, is widely applied to various sewing process scenes, and can meet the sewing requirements of various fabrics. However, in the process of forming the primary lock stitch, the lockstitch machine often brings the bottom thread under the stitching material, and the bottom thread is interweaved and wound, and the length of the upper thread brought down is different, so that the scope of interweaving and winding under the lockstitch machine is different, and the characteristics are changed into a bird nest in the industry. Bird nest formed by the first part of the sewing is unattractive and is not accepted, especially for high quality clothing. At present, the following two methods are available for processing bird nests in the early stage of sewing.

The manual removal is carried out in the first mode, but the labor intensity of workers is greatly increased in the first mode, the labor cost is high, the input cost is high, the waste time is high, and the efficiency is low.

The second mode adopts the little bird nest thread cutting device for cut the section line end when playing the seam, but current little bird nest thread cutting device very easily appears the upper thread and takes off the phenomenon of line after playing the seam and cut the line, causes follow-up can not form good stitch, reduces sewing quality.

Therefore, the technology and method for removing bird nests or less bird nests in the market at present cannot well meet the requirements of customers on sewing quality.

Disclosure of utility model

In view of the above-mentioned drawbacks of the prior art, the present utility model aims to provide a movable knife with less bird nest, which can not only realize less bird nest for starting the seam and trimming at the end of the seam, but also reliably avoid the needle thread from being stripped.

In order to achieve the above purpose, the utility model provides a movable knife with less bird nest, comprising a movable knife body, wherein the movable knife body is provided with a seam lifting cutting edge, a seam post cutting edge, a first knife holder line part, a seam lifting hook line groove and a seam lifting needle passing groove, the seam lifting cutting edge and the seam post cutting edge are shared cutting edges, the first knife holder line part is arranged on the surface of the movable knife body and is used for clamping an upper line head, and the seam lifting hook line groove and the seam lifting needle passing groove are both used for a needle in a sewing machine to pass through.

Further, the seam lifting needle passing grooves are distributed between the common cutting edge and the seam lifting hook grooves, and the seam lifting needle passing grooves are groove bodies formed in the movable cutter body.

Further, along the direction perpendicular to the side-by-side direction of the seam lifting hook slot, the seam lifting needle passing slot and the shared cutting edge, the movable cutter body is provided with a supporting part at the inner side of the seam lifting needle passing slot.

Further, the seam lifting needle passing grooves are distributed on one side, back to the seam lifting hook groove, of the common cutting edge, and the seam lifting needle passing grooves are empty areas formed on the outer periphery of the movable cutter body.

Further, the seam starting and needle passing groove is arranged close to the common cutting edge, a transition surface distributed between the seam starting and needle passing groove and the common cutting edge is arranged at the outer edge of the movable cutter body, and the transition surface is an inclined surface or an arc surface.

Further, the seam-lifting needle passing groove is arranged far away from the common cutting edge.

Further, the movable cutter body is an arc cutter body; along the circumference of the movable cutter body, the seam lifting and hooking groove, the seam lifting and penetrating groove and the shared shearing edge are distributed on the same circumference of the movable cutter body.

Further, a seam lifting groove is arranged on the surface of the movable cutter body, and the seam lifting groove is connected between the shared cutting edge and the seam lifting groove.

Further, the movable cutter body is further provided with a thread dividing groove and a thread cutting and branching tip, the shared thread cutting edge and the thread cutting and branching tip are respectively arranged on two sides of the movable cutter body, the thread dividing groove is distributed between the shared thread cutting edge and the thread cutting and branching tip, and the direction of the thread dividing groove is opposite to the feeding direction when the sewing machine is in forward sewing.

Further, the surface of the movable cutter body is provided with a post-sewing wire containing groove, and the post-sewing wire containing groove is connected between the shared shearing cutting edge and the wire distributing groove.

Further, the movable cutter body is provided with a protruding cutting edge bulge at the position of the common cutting edge, and part of the edge bulge forms the common cutting edge.

The utility model also provides a thread cutting mechanism of the sewing machine, which comprises a fixed cutter, a thread clamping component and a movable cutter with less bird nest, wherein the fixed cutter is fixedly arranged, the thread clamping component is fixedly arranged, and the movable cutter can move in a direction approaching to or far from the fixed cutter;

when the movable cutter body moves towards the direction close to the fixed cutter, the common shearing line cutting edge can be meshed with the fixed cutter;

When the seam lifting and passing needle groove on the movable cutter body moves to the position right below the needle in the sewing machine, the common thread cutting edge is not meshed with the fixed cutter, and the first cutter clamping part is abutted with the thread clamping part, and a thread clamping seam for clamping the upper thread head is formed between the first cutter clamping part and the thread clamping part.

Further, the thread clamping component is a thread clamping piece arranged by an independent fixed cutter; along the radial direction of a rotating shuttle in the sewing machine, the movable knife with less bird nest, the fixed knife and the thread clamping piece are distributed in sequence from inside to outside, and the first tool holder thread part is arranged on the upper surface of the movable knife body facing the thread clamping piece.

Further, the wire clamping component is a second tool holder wire part integrally arranged on the fixed tool; along the radial direction of a rotating shuttle in the sewing machine, the movable knife with less bird nest and the fixed knife are distributed in sequence from inside to outside, and the first knife clamping line part is arranged on the upper surface of the movable knife body facing the fixed knife.

Further, the wire clamping component is a wire separation sheet arranged by an independent fixed cutter; the thread separation sheet, the movable knife with less bird nest and the fixed knife are distributed in sequence from inside to outside along the radial direction of the rotating shuttle in the sewing machine, and the first knife holder thread part is arranged on the lower surface of the movable knife body facing the thread separation sheet.

Further, the sewing machine thread cutting mechanism further comprises a thread cutting driving source, a thread cutting driving shaft rotatably supported in the sewing machine bottom plate, a thread cutting transmission crank fixed on the thread cutting driving shaft, a thread cutting connecting rod and a movable cutter frame rotatably supported in the sewing machine bottom plate, the thread cutting driving source is connected with the thread cutting driving shaft, two ends of the thread cutting connecting rod are respectively hinged with the thread cutting transmission crank and the movable cutter frame, and the movable cutter body is fixed on the movable cutter frame.

As described above, the movable knife with less bird nest and the thread cutting mechanism of the sewing machine have the following beneficial effects:

When the needle is used for starting the seam, firstly, the needle passes through the seam starting thread hooking groove, the upper thread end is brought to the lower part of the movable knife with less bird nest, then the upper thread end is clamped by the first knife holder thread part, the needle moves up and down at the seam starting thread passing groove, after the needle number is set for starting the seam, the upper thread end is cut by the seam starting cutting edge, so that the formation of bird nest by winding the upper thread end is prevented, and the upper thread is cut after the needle number is set for starting the seam by the clamping of the first knife holder thread part, so that the upper thread is effectively prevented from falling off during the seam starting. When the sewing is finished and the thread is cut, the upper thread and the bottom thread are cut by the cutting edge of the thread after sewing. Therefore, the application can realize the small bird nest for starting the seam and the trimming at the end of the sewing, can reliably avoid the upper thread from falling off during the starting seam, realize the stable effect of the small bird nest for starting the seam and the normal starting seam, ensure the beautiful appearance of the stitch and reduce the manual trimming of the thread ends. In addition, the application sets the seam starting cutting edge and the seam finishing cutting edge as the same shared cutting edge, so that the application can be better applied to the single-acting knife single-fixed knife thread cutting mechanism with the most traffic in the existing sewing machine, namely, the traditional single-acting knife single-fixed knife thread cutting mechanism is changed into the application by less modification.

Drawings

FIGS. 1a and 1b are schematic diagrams illustrating a structure of a bird nest-less movable blade according to an embodiment of the present utility model at different viewing angles.

Fig. 2a and 2b are schematic structural views of a second embodiment of the bird nest-less movable blade according to the present utility model at different angles.

FIG. 3 is a schematic diagram of a third embodiment of a bird nest-less movable blade.

FIG. 4 is a schematic diagram of a fourth embodiment of a bird nest-less movable blade of the present utility model.

FIG. 5 is a schematic diagram of a fifth embodiment of a bird nest-less movable blade.

FIG. 6 is a schematic diagram of a sixth embodiment of a less bird nest moving blade.

FIG. 7 is a schematic view of a seventh embodiment of a bird nest-less movable blade.

Figure 8 is a schematic diagram of an embodiment eight of the bird nest-less movable blade of the present utility model.

FIG. 9 is a schematic view of a first embodiment of a thread cutting mechanism of a sewing machine according to the present utility model, which is configured with the first embodiment of the bird nest-less movable knife of FIG. 1.

Fig. 10 is a state diagram of fig. 9 at the time of the first needle being slit.

FIG. 11 is a schematic view of a second embodiment of a thread cutting mechanism of a sewing machine according to the present utility model, in which the first embodiment of the thread cutting mechanism is provided with a first embodiment of a movable knife with less bird nest shown in FIG. 1.

Description of element reference numerals

10. Movable cutter body

101. First tool holder line part

102. Thread hooking groove for starting seam

103. Needle slot for starting seam and passing needle

104. Shared cutting edge

105. Support part

106. Seam-lifting line-holding groove

107. Wire dividing groove

108. Line containing groove after sewing

109. Cutting wire and branching tip

110. Transition surface

111. Edge bulge

112. Bump through hole

113. Blade lifting wing

20. Machine needle

30. Fixed knife

40. Wire clamping sheet

50. Branching sheet

61. Movable knife rest

62. Wire cutting driving shaft

63. Wire cutting transmission crank

64. Wire cutting connecting rod

Detailed Description

Further advantages and effects of the present utility model will become apparent to those skilled in the art from the disclosure of the present utility model, which is described by the following specific examples.

It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the utility model to the extent that it can be practiced, since modifications, changes in the proportions, or adjustments of the sizes, which are otherwise, used in the practice of the utility model, are included in the spirit and scope of the utility model which is otherwise, without departing from the spirit or scope thereof. Also, the terms such as "upper", "lower", "left", "right", "middle", etc. are used herein for convenience of description, but are not to be construed as limiting the scope of the utility model, and the relative changes or modifications are not to be construed as essential to the scope of the utility model.

It will also be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or be indirectly connected to the other element through intervening elements.

Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present application.

The utility model relates to the technical field of sewing machines, in particular to a movable knife with less bird nest and a thread cutting mechanism of a sewing machine comprising the movable knife with less bird nest. In general, a sewing machine is provided with a needle 20 that can reciprocate up and down and a rotatable rotating shuttle. In the following embodiment, the axial direction of the rotating shuttle is defined as the left-right direction, the extending direction of the needle 20 is defined as the up-down direction, the direction orthogonal to both the left-right direction and the up-down direction is defined as the front-back direction, and the front direction is the moving direction of the sewing material when the sewing machine is forward sewing.

As shown in fig. 9, the thread cutting mechanism of the sewing machine according to the present utility model comprises a fixed knife 30, a fixed thread clamping member, and a movable knife with less bird nest; the movable cutters with less bird nest are distributed on the inner side, namely the lower side of the fixed cutter 30 along the radial direction of the rotating shuttle. As shown in fig. 1a and 1b, or as shown in fig. 2a and 2b, the movable knife with less bird nest comprises a movable knife body 10, a seam lifting cutting edge, a seam post-cutting edge, a first knife holder line part 101, a seam lifting hook line groove 102 and a seam lifting needle passing groove 103 are arranged on the movable knife body 10, the seam lifting cutting edge and the seam post-cutting edge are shared cutting edges 104, the first knife holder line part 101 is arranged on the surface of the movable knife body 10 and is used for clamping an upper line thread head, and the seam lifting hook line groove 102 and the seam lifting needle passing groove 103 are both used for allowing a needle 20 in a sewing machine to pass. The movable knife body 10 can move in a direction approaching or separating from the fixed knife 30, and the movable knife body 10 moves to enable the seam lifting and hooking groove 102 to move to be right below the needle 20 in the sewing machine, enable the seam lifting and passing groove 103 to move to be right below the needle 20 in the sewing machine, or enable the common cutting edge 104 to be meshed with the fixed knife 30.

The seam lifting and trimming process of the seam trimming mechanism of the sewing machine comprises the following steps:

1. Before the first needle is sewn by the sewing machine or in the process that the first needle 20 is sewn by the sewing machine moves downwards, the movable cutter body 10 moves to enable the sewing hooking groove 102 to move to be right below the needle 20 in the sewing machine; thus, when the first needle 20 of the sewing machine moves downwards, the needle 20 passes through the needle lifting thread hooking groove 102 with the upper thread downwards, and the upper thread end on one side of the needle 20 is brought under the movable knife with less bird nest under the action of the rotating shuttle.

2. The needle 20 moves up from the stitch hooking groove 102 to withdraw the needle thread head from a part, when the needle 20 moves up from the movable knife with less bird nest, the movable knife body 10 moves to move the stitch hooking groove 103 to the position right below the needle 20 in the sewing machine, at this time, the first holder thread part 101 abuts against the thread clamping member to clamp the needle thread head in the thread clamping seam formed by the first holder thread part 101 and the thread clamping member, and the common thread cutting edge 104 is not meshed with the fixed knife 30, so that the needle thread head is in a clamped but not sheared state.

3. The sewing machine starts the second needle, the needle 20 passes through the starting needle passing groove 103 downwards, as shown in fig. 10, the needle material is moved downwards for the second time, the upper thread and the lower thread are interweaved to form a thread knot, and the lower thread can be separated from the starting needle passing groove 103; the sewing machine starts the third needle and … until the starting stitch is full by a set number of needles.

4. The movable cutter body 10 moves in a direction approaching the stationary cutter 30 until the common shearing edge 104 is engaged with the stationary cutter 30 to shear the line ends. Then, the movable blade body 10 moves in a direction away from the fixed blade 30 until moving to the initial position, and the movable blade with less bird nest is reset.

The thread trimming process of the thread trimming mechanism of the sewing machine at the end of sewing comprises the following steps:

After the needle 20 is moved up at the end of sewing, the movable cutter body 10 moves in a direction approaching the fixed cutter 30, carrying the bottom thread and the upper thread together in a direction approaching the fixed cutter 30, until the common cutting edge 104 is engaged with the fixed cutter 30, cutting the upper thread and the bottom thread. Then, the movable blade body 10 moves in a direction away from the fixed blade 30 until moving to the initial position, and the movable blade with less bird nest is reset.

The application can cut the thread end of the thread at the beginning of the seam, cut the thread and the bottom thread at the end of the seam, and the thread end of the upper thread left on the seam material is short after the thread end of the upper thread is cut at the beginning of the seam, thereby preventing bird nest from forming. Therefore, the application can realize the small bird nest for starting the seam and the thread trimming at the end of the sewing, and can realize the thread trimming after the set needle number of starting the seam and the trimming of the thread trimming by clamping the thread trimming on the surface of the first cutter holder thread part 101 before the thread trimming of the seam, thereby effectively avoiding the thread off during the seam starting, realizing the stable effect of the small bird nest for starting the seam and the normal seam starting, ensuring the beautiful appearance of the stitch and reducing the manual trimming of the thread trimming on the premise of preventing the winding of the thread trimming of the surface of the thread trimming.

In addition, the most popular thread cutting mechanism in the existing sewing machine is a single-acting-blade fixed-blade structure, namely a rotatable acting blade and a fixed blade which are fixedly arranged are configured for cutting a thread and a bottom thread when the sewing is finished. Obviously, the movable knife in the existing thread cutting structure is provided with the thread cutting edge after sewing, the thread cutting edge after sewing and the thread cutting edge after sewing are set to be the same shared thread cutting edge 104, the modification to the existing movable knife can be reduced as much as possible, the structure of the movable knife with fewer bird nests is simplified, the thread cutting mechanism of the single movable knife single fixed knife 30 with the most traffic in the existing sewing machine can be better applied, the modification cost is reduced, and the implementation is convenient.

Further, in this embodiment, the movement mode of the movable knife with less bird nest is rotation. Based on this, as shown in fig. 9, the sewing machine thread cutting mechanism further includes a thread cutting driving source, a thread cutting driving shaft 62 rotatably supported in the sewing machine base plate, a thread cutting transmission crank 63 fixed on the thread cutting driving shaft 62, a thread cutting link 64, and a movable blade holder 61 rotatably supported in the sewing machine base plate; the wire cutting driving source is a motor, preferably a stepping motor, and is connected with the wire cutting driving shaft 62 to drive the wire cutting driving shaft 62 to rotate; two ends of the wire cutting connecting rod 64 are respectively hinged with the wire cutting transmission crank 63 and the movable knife rest 61, and the right end part of the movable knife body 10 is fixed on the movable knife rest 61 through screws, so that two fixing holes are formed in the right end part of the movable knife body 10. The fixed knife 30 is fixedly arranged at the rear side of the needle 20, and the less bird nest movable knives are distributed at the front side of the needle 20 in an initial state; when the line cutting driving source drives the line cutting driving shaft 62 to rotate, the line cutting driving crank 63 rotates along with the line cutting driving shaft 62, the line cutting connecting rod 64 drives the movable knife rest 61 to rotate back and forth, and the movable knife body 10 rotates along with the movable knife rest 61, so that the movable knife with less bird nest is driven to rotate back to be close to the fixed knife 30 or to rotate forward to be far away from the fixed knife 30.

Further, as shown in fig. 1a and 1b, or as shown in fig. 2a and 2b, the movable blade body 10 is a circular arc blade body, and the extending track of the circular arc blade body is substantially consistent with the rotating track thereof. The movable cutter body 10 is also provided with a thread dividing groove 107, the left end side of the rear edge of the movable cutter body 10 is also provided with a thread cutting and dividing tip 109, the thread cutting and dividing tip 109 is distributed at the rear side of the thread dividing groove 107, and the direction of the thread dividing groove 107 is opposite to the feeding direction when the sewing machine is in forward sewing, namely the opening of the thread dividing groove 107 is backwards; when the thread cutting is completed, the thread cutting tip 109 passes through the upper thread loop, and then the lower thread and the upper thread on the cut side slide into the thread groove 107. Preferably, the seam lifting and hooking grooves 102 and the branching grooves 107 are all distributed on the rear side of the common cutting edge 104, and the seam lifting and hooking grooves 102 are arranged on the front side of the branching grooves 107 and are adjacent to the branching grooves 107, so that the seam lifting and hooking grooves 102 and the branching grooves 107 are two independent grooves, and the common cutting edge 104, the seam lifting and hooking grooves 102 and the branching grooves 107 are sequentially arranged from front to back. Of course, in other embodiments, the seam hooking groove 102 may be disposed in the branching groove 107, and share the groove body at the branching groove 107.

Preferably, as shown in fig. 1a and 1b, or as shown in fig. 2a and 2b, the upper surface of the movable cutter body 10 is provided with a seam-lifting line accommodating groove 106 and a seam-rear line accommodating groove 108, the seam-lifting line accommodating groove 106 and the seam-rear line accommodating groove 108 extend front and back, the front and rear ends of the seam-lifting line accommodating groove 106 are connected between the common cutting edge 104 and the seam-lifting hook line groove 102, and the front and rear ends of the seam-rear line accommodating groove 108 are connected between the common cutting edge 104 and the branching groove 107. Based on the structure that the seam-lifting hook wire groove 102 is arranged at the front side of the wire-dividing groove 107, the seam-lifting containing wire groove 106 is a part of the seam-rear containing wire groove 108. When the upper thread ends are cut by the seam, the partially drawn upper thread ends are accommodated in the seam-lifting accommodating groove 106 on the upper surface of the movable cutter body 10, so that the upper thread ends are prevented from being wound under the movable cutter with less bird nest. When the cut and the base thread are finished, both the upper thread and the base thread are accommodated in the post-sewing thread accommodating groove 108 on the upper surface of the movable cutter body 10.

Further, in the preferred embodiments of the bird nest-less movable blade, the common cutting edge 101 is preferably formed by: as shown in fig. 1a and 1b, or as shown in fig. 2a and 2b, the movable blade body 10 is provided with an upwardly protruding cutting edge bulge 111 at the common cutting edge 104, and the front-section part edge of the cutting edge bulge 111 constitutes the common cutting edge 104. In addition, the cutting edge bulge 111 is provided with a bulge through hole 112 penetrating up and down, the bulge through hole 112 has a circular hole structure, and the bulge through hole 112 has a conventional structure on the conventional movable cutter body 10. Meanwhile, a lifting blade 113 can be integrally arranged on the right side of the rear edge of the movable blade body 10, the lifting blade 113 acts on the fixed blade 30, and the fixed blade 30 is lifted upwards, so that the common shearing line cutting edge 101 is better meshed with the cutting edge on the fixed blade 30.

Further, in the bird nest reducing movable blade according to the present application, the first cutter holder wire part 101, the stitch raising and hooking groove 102 and the stitch raising and passing groove 103 are provided in various manners, and accordingly, the bird nest reducing movable blade has various embodiments, and several preferred embodiments of the bird nest reducing movable blade are provided below.

Embodiment one of a movable knife with less bird nest

In the first embodiment of the movable blade with less bird's nest, as shown in fig. 1a and 1b, the seam lifting and hooking grooves 102 are arranged close to the parting groove 107 and are distributed between the common cutting edge 104 and the parting groove 107, the seam lifting and hooking grooves 103 are distributed between the common cutting edge 104 and the seam lifting and hooking groove 102, and the seam lifting and hooking grooves 103 are groove bodies arranged on the movable blade body 10, so that the common cutting edge 104, the seam lifting and hooking grooves 103, the seam lifting and hooking grooves 102 and the parting groove 107 are sequentially arranged from front to back.

Preferably, the stitch-starting and needle-passing groove 103 is a horn-shaped open groove structure extending leftwards to the left edge of the movable cutter body 10, and the stitch-starting and needle-passing groove 103 is an open groove structure opening leftwards. In addition, in the first embodiment of the movable blade with less bird's nest, the movable blade body 10 is provided with the supporting portion 105 on the right side of the stitch raising and passing groove 103 along the direction perpendicular to the side-by-side direction of the stitch raising and passing groove 102, the stitch raising and passing groove 103 and the common cutting edge 104, that is, along the left-right direction, and the supporting portion 105 enables the stationary blade 30 and the below-described thread clamping blade 40 to smoothly transition on the movable blade body 10. The first tool holder wire part 101 is distributed between the stitch raising and passing groove 103 and the stitch raising and hooking groove 102, and then the first tool holder wire part 101 is arranged at the front side of the stitch raising and hooking groove 102 and is arranged adjacent to the stitch raising and hooking groove 102.

Preferably, the bulge through hole 112, the stitch-raising thread groove 102 and the stitch-raising needle passing groove 103 are not communicated with each other. Along the circumferential direction of the movable cutter body 10, the stitch lifting and hooking groove 102, the stitch lifting and passing groove 103 and the common cutting edge 104 are distributed on the same circumferential line of the movable cutter body 10.

Embodiment two of movable knife with less bird nest

The second embodiment of the bird's nest-less movable blade differs from the first embodiment of the bird's nest-less movable blade in that the set positions of the stitch passing groove 103 and the first holder wire part 101 are different. In the second embodiment of the movable blade with less bird's nest, as shown in fig. 2a and 2b, the stitch raising and passing grooves 103 are distributed on the front side of the common cutting edge 104, which faces away from the stitch raising and passing groove 102, the stitch raising and passing grooves 103 are empty areas formed on the outer periphery side of the movable blade body 10, the empty areas are distributed on the left front end side of the movable blade body 10, and the common cutting edge 104 is disposed near the edge of the left front end side of the movable blade body 10, that is, the stitch raising and passing grooves 103 and the common cutting edge 104 are disposed adjacently. Preferably, the first holder line part 101 is provided at the rear side of the common cutting edge 104 and is provided adjacent to the common cutting edge 104. Since the stitch-lifting needle-passing groove 103 is formed on the outer peripheral side of the movable cutter body 10, the movable cutter body 10 is free from grooving between the common cutting edge 104 and the stitch-lifting thread-hooking groove 102, so that the stationary cutter 30 and the thread clamping piece 40 described below can be smoothly transited on the movable cutter body 10.

Embodiment III of movable knife with less bird nest

As shown in fig. 3, in the third embodiment of the bird nest-less movable blade, the bulge through hole 112 is used as the seam-raising and hooking groove 102, that is, the bulge through hole 112 forms the seam-raising and hooking groove 102. Thus, the existing hole structure on the movable cutter body 10 is utilized as the seam lifting and hooking groove 102, so that the structure can be simplified, the additional groove body forming the seam lifting and hooking groove 102 is omitted from being additionally arranged on the movable cutter body 10, the cost is reduced, the third embodiment of the movable cutter with less bird nest can be well applied to the existing movable cutter, and the transformation cost is reduced.

Further, in the third embodiment of the bird nest-less movable blade, as shown in fig. 3, the stitch raising and passing groove 103 is a hollow area formed on the front edge side of the movable blade body 10, and then the stitch raising and passing groove 103 is disposed adjacent to the common cutting edge 104 and the stitch raising and hooking groove 102. Preferably, the outer edge of the movable cutter body 10 is provided with a transition surface 110 distributed between the stitch-lifting needle passing groove 103 and the common shearing edge 104, the transition surface 110 is an inclined surface or an arc surface, and the transition surface 110 is in smooth transition connection with the outer edge of the peripheral movable cutter body 10. After the thread cutting is completed at the end of sewing, the movable cutter body 10 rotates forward to reset, and in the process, the transition surface 110 slightly separates the bottom thread to prevent the bottom thread from being pulled. Along the circumferential direction of the movable cutter body 10, the stitch-lifting needle-passing groove 103, the common shearing edge 104, the stitch-lifting thread-hooking groove 102 and the thread-branching groove 107 are distributed on the same circumferential line of the movable cutter body 10 and are sequentially distributed from front to back. In addition, only the post-sewing thread accommodating groove 108 is formed on the upper surface of the movable cutter body 10, but the thread accommodating groove 106 is not formed, the front end and the rear end of the post-sewing thread accommodating groove 108 are respectively connected between the shared thread cutting edge 104 and the thread dividing groove 107, and the post-sewing thread accommodating groove 108 is used for accommodating the upper thread and the lower thread when the thread cutting is finished during sewing. The first holder line part 101 is provided on the upper surface of the cutting edge bulge 111, and is distributed on the front side of the common cutting edge 104.

Embodiment IV of movable knife with less bird nest

As shown in fig. 4, the seam lifting and hooking groove 102 is disposed away from the common cutting edge 104, the seam lifting and hooking groove 102 is not communicated with the bulge through hole 112, the common cutting edge 104 is close to the front side of the movable cutter body 10, the seam lifting and hooking groove 102 is close to the rear side of the movable cutter body 10, and the branching grooves 107 are distributed between the common cutting edge 104 and the seam lifting and hooking groove 102. The stitch-lifting and needle-passing groove 103 is a hollow region formed on the front edge side of the movable blade body 10. Preferably, the upper surface of the movable cutter body 10 is provided with a seam-lifting line containing groove 106 and a seam-rear line containing groove 108, the front end and the rear end of the seam-lifting line containing groove 106 are connected between the common cutting edge 104 and the seam-lifting hook line groove 102, and the front end and the rear end of the seam-rear line containing groove 108 are respectively connected between the common cutting edge 104 and the branching groove 107. The common cutting edge 104, the branching groove 107 and the seam lifting hook groove 102 are sequentially arranged from front to back, so that the seam rear containing groove 108 is a part of the seam lifting containing groove 106. In the fourth embodiment of the movable cutter body 10, since the seam lifting hook slot 102 is disposed away from the common cutting edge 104, more upper thread ends can be drawn out to the upper surface of the movable cutter body 10 during the seam lifting and cutting process, and the upper thread ends are accommodated in the seam lifting and accommodating slot 106.

Embodiment five of movable knife with less bird nest

It differs from the three embodiment of the bird nest less movable blade only in that: as shown in fig. 5, the seam-raising and hooking grooves 102 are distributed between the bulge through holes 112 and the branching grooves 107, the seam-raising and hooking grooves 102 are arranged adjacent to the bulge through holes 112, and the seam-raising and hooking grooves 102 are through grooves penetrating up and down and are of a closed groove structure. The sewing thread hooking groove 102 is not communicated with the bulge through hole 112, and the sewing thread hooking groove 102 is a waist-shaped hole extending forwards and backwards. In addition, a seam forming groove 106 may be formed on the upper surface of the movable cutter body 10, and the front and rear ends of the seam forming groove 106 are connected between the common cutting edge 104 and the seam forming groove 102.

Embodiment six of movable knife with less bird nest

It differs from the fifth embodiment of the bird nest less movable blade only in that: as shown in fig. 6, the front end of the sewing thread groove 102 extends forward to the rear end of the bulge through hole 112, that is, the sewing thread groove 102 communicates with the bulge through hole 112, and the two are combined into an integral structure.

Embodiment seven of movable knife with less bird nest

It differs from the fifth embodiment of the bird nest less movable blade only in that: as shown in fig. 7, the seam lifting hook slot 102 is an open slot structure with an opening on the left side, and the left end of the seam lifting hook slot 102 extends to the left edge of the movable cutter body 10.

Embodiment eight of movable knife with less bird nest

It differs from the fifth embodiment of the bird nest less movable blade only in that: as shown in fig. 8, the seam hooking groove 102 is a circular hole.

Further, in the thread cutting mechanism of the sewing machine according to the present application, various thread clamping members are provided, and accordingly, the thread cutting mechanism of the sewing machine is provided with a plurality of embodiments.

Such as: in the first embodiment of the thread cutting mechanism of the sewing machine, as shown in fig. 9, the thread clamping member is a thread clamping piece 40 provided with an independent fixed knife 30; along the radial direction of a rotating shuttle in the sewing machine, the movable knife with less bird nest, the fixed knife 30 and the thread clamping piece 40 are sequentially distributed from inside to outside, the first knife clamping thread part 101 is arranged on the upper surface of the movable knife body 10 facing the thread clamping piece 40 and matched with the thread clamping piece 40, and the upper side of the movable knife with less bird nest clamps the upper thread head.

And, for example: in the second embodiment of the thread cutting mechanism of the sewing machine, the thread clamping member is a second thread clamping part integrally provided on the stationary blade 30; along the radial direction of a rotating shuttle in the sewing machine, the movable knife with less bird nest and the fixed knife 30 are distributed in sequence from inside to outside, the first knife clamping line part 101 is arranged on the upper surface of the movable knife body 10 facing the fixed knife 30 and is matched with the second knife clamping line part of the fixed knife 30, and the upper line head is clamped on the upper side of the movable knife with less bird nest.

For another example: in a third embodiment of the thread cutting mechanism of the sewing machine, as shown in fig. 11, the thread clamping component is a thread separating sheet 50 arranged on the independent fixed knife 30; the thread separating sheet 50, the movable knife with less bird nest and the fixed knife 30 are distributed in sequence from inside to outside along the radial direction of the rotating shuttle in the sewing machine, the first knife clamping thread part 101 is arranged on the lower surface of the movable knife body 10 facing the thread separating sheet 50 and matched with the thread separating sheet 50, and the upper thread head is clamped at the lower side of the movable knife with less bird nest.

Further, the thread cutting mechanism of the sewing machine further comprises an air suction pipe fixedly arranged, wherein the air suction pipe and the fixed knife 30 are arranged on the same side, namely, are arranged on the rear side of the needle 20, and an air suction inlet of the air suction pipe is aligned with the stitch lifting thread hooking groove 102 and/or the stitch lifting thread containing groove 106 and is used for pre-capturing the upper thread ends and collecting the cut upper thread ends when the stitch lifting thread is cut.

Taking the embodiment of the thread cutting mechanism of the sewing machine with less bird nest moving blades as an example, the thread clamping piece 40 is taken as an example, the working principle of the thread cutting mechanism of the sewing machine is described as follows.

1. In the initial state, the movable knife with less bird nest is arranged at the front side of the needle 20, and the fixed knife 30 is arranged at the rear side of the needle 20.

2. The thread cutting driving source drives the movable cutter body 10 to rotate backwards, so that the thread hooking groove 102 moves to the position right below the needle 20 in the sewing machine. When the first needle 20 moves downwards, the needle 20 moves downwards from the thread hooking groove 102 and then upwards, and the thread end of the upper thread passes through the thread hooking groove 102 downwards and is pulled out upwards by combining with the thread hooking of the rotating shuttle. When the needle 20 moves up to a certain position, the thread cutting driving source drives the movable cutter body 10 to continuously rotate backwards, so that the stitch-lifting and passing needle groove 103 moves to the position right below the needle 20 in the sewing machine, and meanwhile, the first cutter thread clamping part 101 contacts with the thread clamping piece 40 to clamp the upper thread head. The sewing machine starts to sew the second needle, the needle 20 moves downwards from the starting and passing needle groove 103 and then moves upwards, the upper thread and the lower thread are interwoven to form a thread knot, and the lower thread can be separated from the starting and passing needle groove 103. After the stitch setting is performed, the movable cutter body 10 is driven by the thread cutting driving source to continue to rotate backwards until the shared thread cutting edge 104 is meshed with the fixed cutter 30, thread ends of the thread are cut, the cut thread ends of the thread are sucked away by the air suction pipe, and the thread ends of the thread are prevented from being wound on the rotating shuttle or the stitch again. The wire cutting driving source drives the movable cutter body 10 to rotate forwards and reset.

3. Needle 20 is again moved down and the stitch is normally formed.

4. When the sewing is finished and the thread is cut, the thread cutting driving source drives the movable cutter body 10 to rotate backwards, and the thread cutting tip 109 firstly penetrates through the upper thread loop; as the movable cutter body 10 continues to rotate backward, the bottom thread and the upper thread cut on one side slide into the thread dividing groove 107, and then the bottom thread and the upper thread are accommodated in the post-sewing thread accommodating groove 108; when the common cutting edge 104 is engaged with the stationary knife 30, the upper thread and the lower thread are cut. The wire cutting driving source drives the movable cutter body 10 to rotate forwards and reset.

In summary, the present utility model effectively overcomes the disadvantages of the prior art and has high industrial utility value.

The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Therefore, it is intended that all equivalent modifications and changes which a person having ordinary skill in the art can accomplish without departing from the spirit and technical spirit of the present utility model are to be covered by the claims of the present utility model.

Claims (16)

1. The utility model provides a little nest activity sword, includes activity cutter body (10), its characterized in that: the movable cutter body (10) is provided with a seam lifting cutting edge, a seam post-cutting edge, a first cutter holder line part (101), a seam lifting hook line groove (102) and a seam lifting needle passing groove (103), the seam lifting cutting edge and the seam post-cutting edge are shared cutting edges (104), the first cutter holder line part (101) is arranged on the surface of the movable cutter body (10) and is used for clamping an upper line thread head, and the seam lifting hook line groove (102) and the seam lifting needle passing groove (103) are both used for allowing a needle (20) in a sewing machine to pass through.

2. The bird nest reducing movable knife as claimed in claim 1, wherein: the seam lifting and needle passing grooves (103) are distributed between the common cutting edge (104) and the seam lifting and needle hooking grooves (102), and the seam lifting and needle passing grooves (103) are groove bodies formed in the movable cutter body (10).

3. The bird nest reducing movable knife as claimed in claim 2, wherein: along the direction perpendicular to the side-by-side direction of the seam lifting and hooking groove (102), the seam lifting and passing groove (103) and the shared shearing edge (104), the movable cutter body (10) is provided with a supporting part (105) at the inner side of the seam lifting and passing groove (103).

4. The bird nest reducing movable knife as claimed in claim 1, wherein: the seam lifting and needle passing grooves (103) are distributed on one side of the common cutting edge (104) back to the seam lifting and needle hooking groove (102), and the seam lifting and needle passing grooves (103) are empty areas formed on the outer periphery of the movable cutter body (10).

5. The bird nest reducing movable blade of claim 4, wherein: the seam starting and needle passing groove (103) is arranged close to the common cutting edge (104), a section of transition surface (110) distributed between the seam starting and needle passing groove (103) and the common cutting edge (104) is arranged at the outer edge of the movable cutter body (10), and the transition surface (110) is an inclined surface or an arc surface.

6. The bird nest reducing movable knife as claimed in claim 1, wherein: the stitch-lifting needle-passing groove (103) is arranged far away from the shared cutting edge (104).

7. The bird nest reducing movable knife as claimed in claim 1, 2 or 4, wherein: the movable cutter body (10) is an arc cutter body; along the circumference of the movable cutter body (10), the seam lifting and hooking groove (102), the seam lifting and penetrating groove (103) and the shared cutting edge (104) are distributed on the same circumference of the movable cutter body (10).

8. The bird nest reducing movable knife as claimed in claim 1, wherein: the surface of the movable cutter body (10) is provided with a seam lifting groove (106), and the seam lifting groove (106) is connected between the shared cutting edge (104) and the seam lifting groove (102).

9. The bird nest reducing movable knife as claimed in claim 1, wherein: still be equipped with branch line groove (107) and cut line separated time point portion (109) on movable cutter body (10), common cutting edge (104) and cut line separated time point portion (109) are established respectively in the both sides side of movable cutter body (10), branch line groove (107) distribute between common cutting edge (104) and cut line separated time point portion (109), the orientation of branch line groove (107) is opposite with the pay-off direction when sewing machine is just sewed.

10. The bird nest reducing movable knife as claimed in claim 9, wherein: the surface of the movable cutter body (10) is provided with a post-sewing wire containing groove (108), and the post-sewing wire containing groove (108) is connected between the shared cutting edge (104) and the wire distributing groove (107).

11. The bird nest reducing movable knife as claimed in claim 1, wherein: the movable cutter body (10) is provided with a protruding cutting edge bulge (111) at the position of the common cutting edge (104), and part of the edge of the cutting edge bulge (111) forms the common cutting edge (104).

12. The utility model provides a sewing machine thread trimming mechanism, includes fixed stationary knife (30) of setting, its characterized in that: the movable knife body (10) can move towards or away from the fixed knife (30);

When the movable cutter body (10) moves towards the direction approaching to the fixed cutter (30), the common shearing edge (104) can be meshed with the fixed cutter (30);

When the seam-lifting and needle-passing groove (103) on the movable cutter body (10) moves to the position right below the needle (20) in the sewing machine, the shared thread-cutting edge (104) is not meshed with the fixed cutter (30), and the first cutter clamping part (101) is abutted with the thread clamping part, and a thread clamping seam for clamping the upper thread head is formed between the first cutter clamping part and the thread clamping part.

13. The sewing machine thread cutting mechanism of claim 12, wherein: the thread clamping component is a thread clamping sheet (40) arranged on the independent fixed knife (30); along the radial direction of a rotating shuttle in the sewing machine, the movable knife with less bird nest, the fixed knife (30) and the thread clamping piece (40) are distributed in sequence from inside to outside, and the first tool clamping thread part (101) is arranged on the upper surface of the movable knife body (10) facing the thread clamping piece (40).

14. The sewing machine thread cutting mechanism of claim 12, wherein: the thread clamping component is a second tool holder thread part integrally arranged on the fixed tool (30); along the radial direction of a rotating shuttle in the sewing machine, the movable knife with less bird nest and the fixed knife (30) are sequentially distributed from inside to outside, and the first knife clamping line part (101) is arranged on the upper surface of the movable knife body (10) facing the fixed knife (30).

15. The sewing machine thread cutting mechanism of claim 12, wherein: the wire clamping component is a wire separating sheet (50) arranged on the independent fixed knife (30); the branching piece (50), the movable knife with less bird nest and the fixed knife (30) are distributed in sequence from inside to outside along the radial direction of the rotating shuttle in the sewing machine, and the first knife clamping line part (101) is arranged on the lower surface of the movable knife body (10) facing the branching piece (50).

16. The sewing machine thread cutting mechanism of claim 12, wherein: the sewing machine further comprises a thread cutting driving source, a thread cutting driving shaft (62) rotatably supported in the sewing machine bottom plate, a thread cutting transmission crank (63) fixed on the thread cutting driving shaft (62), a thread cutting connecting rod (64) and a movable knife rest (61) rotatably supported in the sewing machine bottom plate, wherein the thread cutting driving source is connected with the thread cutting driving shaft (62), two ends of the thread cutting connecting rod (64) are respectively hinged with the thread cutting transmission crank (63) and the movable knife rest (61), and the movable knife body (10) is fixed on the movable knife rest (61).