阅读说明：本技术 一种有飞梭底线的手持缝纫机及其运动方式 (Handheld sewing machine with flying shuttle bobbin thread and motion mode thereof ) 是由 张帅 张振国 王济 蔡雄飞 冯丽娟 谢雅典 孙媛媛 于 2020-06-16 设计创作，主要内容包括：本发明公开了一种有飞梭底线的手持缝纫机及其运动方式,包括联动机构,底座,压梁,其中；在压梁一端头安装有缝纫机针拧入定针螺栓固定,压梁侧面上装有调线纽,调线纽连接压梁内的线轮,压梁腹部连接压缩弹簧一端,压缩弹簧另一端连接底座,压梁卡入底座插入轴铰接,底座内安装有联动机构,联动机构连接压梁,压梁固定连接压脚。其运动方式是,压梁带动联动机构,本发明上下双线,操作灵活,缝制效果好,便于携带。(The invention discloses a hand-held sewing machine with a flying shuttle bottom line and a motion mode thereof, comprising a linkage mechanism, a base and a pressing beam, wherein the base is provided with a plurality of guide rails; the sewing machine needle is installed at one end head of the pressing beam and screwed into the fixed needle bolt for fixing, a thread adjusting button is installed on the side face of the pressing beam and connected with a thread wheel in the pressing beam, the belly of the pressing beam is connected with one end of a compression spring, the other end of the compression spring is connected with a base, the pressing beam is clamped into the base and hinged with an insertion shaft, a linkage mechanism is installed in the base and connected with the pressing beam, and the pressing beam is fixedly connected with a pressing foot. The motion mode is that the pressing beam drives the linkage mechanism, and the sewing machine has the advantages of upper and lower double lines, flexible operation, good sewing effect and portability.)

1. A hand-held sewing machine with a shuttle bottom thread comprises a linkage mechanism (1), a base (2) and a pressing beam (3), and is characterized in that; install sewing machine needle (4) at press beam (3) one end and twist and decide needle bolt (5) fixed, be equipped with on press beam (3) side and transfer line button (7), transfer line button (7) and connect the line wheel in press beam (3), press beam (3) belly connection compression spring (8) one end, base (2) are connected to compression spring (8) other end, press beam (3) card is gone into base (2) and is inserted the axle and articulate, install linkage (1) in base (2), press beam (3) are connected to linkage (1), press beam (3) fixed connection presser foot (6).

2. The hand-held sewing machine with a fly shuttle bobbin thread according to claim 1, wherein the linkage mechanism (1) is composed of a shifting fork (9), a clamping plate A (10), a crank throw A (11), a branch pull rod A (12), a feed dog seat (13), a feed dog (14), a clamping plate B (15), a branch pull rod B (16), a cam (17), a fly shuttle (18), a fly shuttle seat (19), a crank throw B (20), a power rod (21), a crank throw C (22), a branch pull rod B (23) and a crank throw D (24), the power rod (21) and the crank throw C (22) are respectively clamped between the clamping plate A (10) and the clamping plate B (15), one end of the branch pull rod B (23) is hinged at the upper end of the crank throw C (22), one end of the crank throw A (11) is hinged at the other end of the crank throw B (23), and the crank A (11) is inserted into a pin to connect the clamping plate A (10) and the clamping plate B (15), one end of a branch pull rod A (12) is hinged to the other end of a crank throw A (11), the other end of the branch pull rod A (12) is hinged to a cloth feeding tooth seat (13), cloth feeding teeth (14) are arranged on the cloth feeding tooth seat (13), two cams (17) are placed below the cloth feeding tooth seat (13), the two cams (17) are respectively inserted into a pin to connect a clamping plate A (10) and a clamping plate B (15), the two cams (17) are respectively hinged to two ends of the branch pull rod B (16), one end of the branch pull rod B (16) is hinged to a crank throw D (24), the crank throw D (24) is inserted into a pin to connect the clamping plate A (10) and the clamping plate B (15), flying shuttle seats (19) are placed on raised lines arranged on the clamping plate A (10) and the clamping plate B (15), flying shuttles (18) are placed in the flying shuttle seats (19), one end of the crank throw B (20) is inserted into the lower portion of the flying shuttle seats (19), and the other end of, The lower end of the power rod (21) is inserted into one end of a pin connecting shifting fork (9), the middle part of the shifting fork (9) is inserted into a pin connecting clamping plate A (10) and a clamping plate B (15), and a lever arranged at the lower end of the pressing beam (3) is inserted into a rotating sleeve arranged at the other end of the shifting fork (9).

3. A movement mode of a hand-held sewing machine with a fly shuttle bobbin thread is characterized in that;

1) the cloth feeding tooth (14) is located at the highest position, the cam (17) is located at the vertical state flying shuttle (18), the flying shuttle seat (19) is located at the right position, when sewing is carried out, when the beam (3) is pressed downwards by hand, the shifting fork (9) drives the power rod (21) to move downwards, a contact shoulder i (32) of the power rod (21) is pressed against a contact point h (31) of the crank D (24) to enable the crank D (24) to shift the branch pull rod B (16) rightwards, the cam (17) is driven by the branch pull rod B (16) to rotate around the axis of the cam in the clockwise direction until the cam rotates to the lowest position of the cam, so that the cloth feeding tooth seat (13) is vertically dropped below a sewing plane, and the presser foot (6) and the cloth at the moment also drop along with the cloth feeding tooth seat (13), and finally the cam is located on the plane of the base (2);

2) when the power rod (21) continues to move downwards, the contact shoulder f (28) of the power rod (21) pushes against a contact e (29), the contact e (29) drives a crank throw C (22) to move, the crank throw C (22) drives a branch pull rod B (23) to move, the branch pull rod B (23) drives a crank throw A (11), the crank throw A (11) drives a branch pull rod A (12) to push the cloth feeding tooth seat (13) to a right terminal point, and the cloth feeding tooth seat is waited to rise again next time;

3) meanwhile, a contact shoulder B (26) of the power rod (21) is abutted against a contact a (27), the contact a (27) drives a crank throw B (20) to rotate in the anticlockwise direction, and the crank throw B (20) drives a shuttle flying seat (19) to fly a shuttle (18) from the right position to the left position;

4) when the needle point of the sewing machine needle (4) starts to move downwards from the upper dead point until the needle point of the sewing machine needle (4) is 1 mm away from the shown presser foot (6), the actions of 1), 2) and 3) are finished until the needle point of the sewing machine needle (4) reaches the lower dead point, and the actions are all in the state;

5) when the pressing beam (3) is released by a hand, the sewing machine performs lower half part sewing work under the action of the elastic force of the compression spring (8), the shifting fork (9) shifts the power rod (21) to move upwards under the action of the compression spring (8), the contact c (25) on the power rod (21) is positioned below the contact a (27), when the power rod (21) moves upwards, the contact c (25) pushes against the contact a (27), and the crank B (20) drives the fly shuttle seat (19) to fly the fly shuttle (18) from the left position to the right position of the figure, so that the aim of enabling the fly shuttle to pass through the upper thread is fulfilled;

6) when a contact shoulder i (32) on the power rod (21) reaches the position below a contact point h (31), and the power rod (21) moves upwards, a contact shoulder g (33) pushes the contact point h (31) to drive a crank D (24) to rotate in the anticlockwise direction, so that a branch traction rod B (16) is pulled to move rightwards, a cam (17) rotates leftwards according to the axis of the cam to become an upright state, and a presser foot (6) and a cloth feeding tooth seat (13) are lifted vertically upwards to prepare for horizontal cloth feeding;

7) when the cloth feeding tooth holder (13) is in an upright state, the contact shoulder d (30) on the power rod (21) just pushes the contact point e (29) upwards from the lower direction, so that the crank C (22) is driven to drive the branch pull rod B (23) to move, the branch pull rod B (23) drives the crank A (11), and the crank A (11) drives the branch pull rod A (12) to horizontally move the cloth feeding tooth holder (13) leftwards, so that the work of feeding cloth forwards is completed;

8) when the sewing machine needle (4) starts to lift upwards at the bottom dead center, when the needle point of the sewing machine needle (4) rises by 1.5 mm, the upper thread on the sewing machine needle (4) forms a thread sleeve, the threading action of the shuttle (11) is performed at the moment, the sewing machine needle (4) continues to rise at the moment, and when the height of the needle point of the sewing machine needle (4) exceeds the upper plane of the presser foot (6) of the sewing machine needle (4) by 2 mm, the vertical rising action and the horizontal leftward cloth feeding action of the cloth feeding tooth seat (13) are performed.

4. A hand-held sewing machine with a fly bobbin thread as claimed in claim 1, characterised in that the fly (18) is olive shaped and moves side to side over a recess provided in the fly seat (19).

5. A hand-held sewing machine with a fly bobbin thread as claimed in claim 1 wherein the fly base (19) is movable to the left and right.

6. A hand-held sewing machine with a fly bobbin thread according to claim 1 wherein the power bar (21) is of a convex curved type and is movable up and down.

Technical Field

The invention belongs to the technical field of machinery, and particularly relates to a handheld sewing machine with a flying shuttle bobbin thread, and a motion mode of the sewing machine.

Background

Sewing machines are the most basic sewing devices in garment production, used for almost all garment products. A sewing machine is primarily a machine that uses one or more sewing threads to form one or more stitches in a material to be sewn, thereby interweaving or stitching one or more layers of material. The sewing machine is mainly used in the industries of clothes, cases, leather, shoes and the like, can also sew fabrics such as cotton, hemp, silk, wool, artificial fiber and the like, plastics, paper and other products, and sews neat, beautiful, uniform, flat and firm stitches with the simplest stitches, and has the advantages of high sewing speed, simple and convenient operation, simple and understandable use.

At present, in the industry of sewing machines, the sewing machines are developed, and the types, models and styles of the sewing machines are full of precious. However, the general classification is divided into two major categories, namely, a home-use sewing machine and an industrial-use sewing machine. The popularity of home sewing machines is unprecedented, and it has become an essential daily necessity for people to sew clothes. The household sewing machine generally comprises a head part, a table part and a frame part, and the sewing machine has the advantages of complex structure, more parts, large volume and higher cost. In use, it is not a very sophisticated technique for the user, but it must have a certain basic knowledge and skill to operate. Before each use, the thread and sewing needle are selected according to the properties of the sewed article, such as material, hardness and thickness of the article, and then accurately installed and adjusted according to the mentioned conditions to make the sewed article in a relatively fixed position.

Although some household sewing machines are made very small, exquisite and portable, the sewing machines are still inconvenient to carry and use in the carrying process because the sewing machines are operated and used in relatively fixed places in use. Therefore, people often prefer to sew by hand and do not start the sewing machine for simple sewing, especially for people who do not know the operation method of the sewing machine, or people mail small articles, travel, simple sewing of small families and the like. The manual sewing work obviously has low efficiency, wastes time and labor, has poor sewing quality, is very irregular and is not firm.

In order to minimize the inconvenience of the pure manual labor, many people and volunteers put forward various manual mini-sized sewing machines and have products popular on the market. The structure of the door is composed of a machine body, an upper bridge, a force rod, a lever, a spring and the like, and the bottomless shuttle sewing is realized by using a combined swing cam hook, wherein the simplest method is that no combined swing cam hook is used, but a static spring hook is used for hooking the thread. However, these products are all single thread sewn. The stitches made by single-thread sewing are in the form of loops, and are easily loosened once they come off the thread end, which is the biggest disadvantage of single-thread sewing. In addition, some manual miniature sewing machines are inflexible in operation, often cause thread jamming and have rough sewing effect.

Disclosure of Invention

The invention aims to overcome the defects and provide the portable handheld sewing machine with the flying shuttle bobbin thread, which has the advantages of flexible operation, good sewing effect and convenient carrying.

The purpose of the invention and the main technical problem of solving the invention are realized by adopting the following technical scheme:

the invention relates to a hand-held sewing machine with a flying shuttle bottom line, which comprises a linkage mechanism, a base and a pressing beam, wherein the base is fixedly connected with the base; the sewing machine needle is installed at one end head of the pressing beam and screwed into the fixed needle bolt for fixing, a thread adjusting button is installed on the side face of the pressing beam and connected with a thread wheel in the pressing beam, the belly of the pressing beam is connected with one end of a compression spring, the other end of the compression spring is connected with a base, the pressing beam is clamped into the base and hinged with an insertion shaft, a linkage mechanism is installed in the base and connected with the pressing beam, and the pressing beam is fixedly connected with a pressing foot.

The linkage mechanism consists of a shifting fork, a clamping plate A, a crank throw A, a branch pull rod A, a cloth feeding tooth seat, a cloth feeding tooth, a clamping plate B, a branch pull rod B, a cam, a shuttle seat, a crank throw B, a power rod, a crank throw C, a branch pull rod B and a crank throw D, wherein the power rod and the crank throw C are respectively clamped between the clamping plate A and the clamping plate B, the upper end of the crank throw C is hinged with one end of the branch pull rod B, the other end of the branch pull rod B is hinged with one end of the crank throw A, the crank throw A is inserted into the pin connecting clamping plate A and the clamping plate B, the other end of the crank throw A is hinged with one end of the branch pull rod A, the other end of the branch pull rod A is hinged with the cloth feeding tooth seat, the cloth feeding tooth is arranged on the cloth feeding tooth seat, the two cams are respectively inserted into the pin connecting clamping plate A and the clamping plate B, the two cams are respectively hinged with the two ends of the branch pull rod B, one, The clamp plate B is characterized in that a flying shuttle seat is arranged on raised lines arranged on the clamp plate A and the clamp plate B, a flying shuttle is arranged in the flying shuttle seat, one end of a crank B is inserted below the flying shuttle seat, the other end of the crank B is inserted into a pin to connect the clamp plate A and the clamp plate B, the lower end of a power rod is inserted into a pin to connect one end of a shifting fork, the middle part of the shifting fork is inserted into the pin to connect the clamp plate A and the clamp plate B, and a lever arranged at the lower end of a pressing beam is inserted into a.

A motion mode of a hand-held sewing machine with a fly bobbin thread, wherein;

1) when the cloth feeding tooth is located at the highest position, the cam is located at the vertical state flying shuttle, the flying shuttle seat is located at the right position, when the sewing work is carried out, when a hand presses the beam downwards, the shifting fork drives the power rod to move downwards, the contact shoulder i of the power rod pushes against the contact point h of the crank D to enable the crank D to shift the branch pull rod B rightwards, the cam rotates clockwise around the axis of the cam under the driving of the branch pull rod B until the cam rotates to the lowest position of the cam, so that the cloth feeding tooth seat vertically falls below a sewing plane, and the presser foot and the cloth at the moment fall along with the cloth feeding tooth seat and finally fall on the plane of the base;

2) when the power rod continues to move downwards, the contact shoulder f of the power rod pushes the contact e, the contact e drives the crank C to move, the crank C drives the branch pull rod B to move, the branch pull rod B drives the crank A, and the crank A drives the branch pull rod A to push the cloth feeding tooth holder to the right end point to wait for rising again next time;

3) meanwhile, a contact shoulder B of the power rod is abutted against a contact a, the contact a drives a crank throw B to rotate in the anticlockwise direction, and the crank throw B drives a shuttle flying seat to fly the shuttle from the right position to the left position;

4) and when the needle point of the sewing machine needle starts to move downwards from the upper dead point until the needle point of the sewing machine needle is 1 mm away from the shown presser foot, the actions of 1), 2) and 3) are finished until the needle point of the sewing machine needle reaches the lower dead point, and the states are all the states.

5) When the pressing beam is released by a hand, the sewing machine performs sewing work of the lower half part under the action of the elasticity of a compression spring, a shifting fork shifts a power rod to move upwards under the action of the compression spring, a contact c on the power rod is positioned below a contact a, when the power rod moves upwards, the contact c is pressed against the contact a, a crank throw B drives a shuttle flying seat to fly a shuttle from a left position to a right position of a diagram, and the aim of enabling the shuttle flying to penetrate through an upper line is fulfilled;

6) when the contact shoulder i on the power rod reaches the position below the contact h and the power rod moves upwards, the contact shoulder g pushes against the contact h to drive the crank D to rotate in the anticlockwise direction, so that the traction branch pull rod B moves rightwards, the cam rotates leftwards according to the axis of the cam to become an upright state, and the presser foot and the feed dog seat are vertically lifted upwards to prepare for horizontal feed;

7) when the cloth feeding tooth seat is in an upright state, the contact shoulder d on the power rod just pushes the contact e upwards from the lower direction, so that the crank C is driven to drive the branch pull rod B to move, the branch pull rod B drives the crank A, and the crank A drives the branch pull rod A to horizontally move the cloth feeding tooth seat leftwards, so that the work of feeding cloth forwards is completed;

8) when the needle point of the sewing machine starts to lift upwards at the bottom dead center and rises 1.5 mm, the upper thread on the sewing machine forms a thread sleeve, the operation of flying shuttle threading is performed at the moment, the sewing machine needle continues to rise at the moment, and when the height of the needle point of the sewing machine exceeds the upper plane of the sewing machine needle presser foot by 2 mm, the vertical rising operation and the horizontal leftward cloth feeding operation of the cloth feeding tooth seat are performed.

The shuttle is olive-shaped and can move left and right on a groove arranged on the shuttle seat.

The shuttle seat can move left and right.

The power rod is provided with a plurality of convex curves which can move up and down.

Compared with the prior art, the invention has obvious beneficial effects; the technical scheme shows that: a sewing machine needle is installed at one end head of a pressing beam and screwed into a fixed needle bolt for fixing, a thread adjusting button is installed on the side face of the pressing beam and connected with a thread wheel in the pressing beam, the belly of the pressing beam is connected with one end of a compression spring, the other end of the compression spring is connected with a base, the pressing beam is clamped into a base and hinged with an insertion shaft, a linkage mechanism is installed in the base and connected with the pressing beam, and the pressing beam is fixedly connected with a pressing foot. When the cloth feeding tooth is positioned at the highest position, the cam is positioned at the vertical state flying shuttle and the flying shuttle seat is positioned at the right position, when the sewing work is implemented, when a hand presses the beam downwards, the shifting fork drives the power rod to move downwards, the contact shoulder i of the power rod pushes against the contact point h of the crank D to enable the crank D to stir the branch pull rod B rightwards, the cam rotates clockwise around the axis of the cam under the driving of the branch pull rod B until the cam rotates to the lowest position of the cam, so that the cloth feeding tooth seat vertically falls below a sewing plane, and the presser foot and the cloth at the moment also fall along with the cloth feeding tooth seat and finally fall on the plane of the base;

when the power rod continues to move downwards, the contact shoulder f of the power rod is abutted to contact e, the contact e drives the crank throw C to move, the crank throw C drives the branch pull rod B to move, the branch pull rod B drives the crank throw A, and the crank throw A drives the branch pull rod A to push the cloth feeding tooth holder to the right end point to wait for rising again next time; meanwhile, a contact shoulder B of the power rod is abutted against a contact a, the contact a drives a crank throw B to rotate in the anticlockwise direction, and the crank throw B drives a shuttle flying seat to fly the shuttle from the right position to the left position; when the needle point of the sewing machine needle moves downwards from the upper dead point until the needle point of the sewing machine needle is 1 mm away from the shown presser foot, the actions of 1), 2) and 3) are finished until the needle point of the sewing machine needle reaches the lower dead point, and the state is the same. When the pressing beam is released by a hand, the sewing machine performs lower half part sewing work under the action of the elasticity of a compression spring, a shifting fork shifts a power rod to move upwards under the action of the compression spring, a contact c on the power rod is positioned below a contact a, when the power rod moves upwards, the contact c is pressed against the contact a, a crank throw B drives a shuttle flying seat to fly a shuttle from a left position to a right position of a diagram, and the aim of enabling the shuttle flying to penetrate through an upper thread is fulfilled; when the contact shoulder i on the power rod reaches the position below the contact h and the power rod moves upwards, the contact shoulder g pushes against the contact h to drive the crank throw D to rotate in the anticlockwise direction, so that the traction branch pull rod B moves rightwards, the cam rotates leftwards according to the axis of the cam to become an upright state, and the presser foot and the cloth feeding tooth seat are vertically lifted upwards to prepare for horizontal cloth feeding; when the cloth feeding tooth seat is in an upright state, the contact shoulder d on the power rod just props up the contact e from the lower direction, so that the crank C is driven to drive the branch pull rod B to move, the branch pull rod B drives the crank A, and the crank A drives the branch pull rod A to horizontally move the cloth feeding tooth seat leftwards, and the work of feeding cloth forwards is completed; when the sewing machine needle starts to lift upwards at the bottom dead center, when the needle point of the sewing machine needle rises by 1.5 mm, the upper thread on the sewing machine needle forms a thread sleeve, the action of flying shuttle threading is performed at the moment, the sewing machine needle continues to rise at the moment, and when the height of the needle point of the sewing machine needle exceeds the upper plane of the sewing machine needle presser foot by 2 mm, the vertical rising action and the horizontal leftward cloth feeding action of the cloth feeding tooth seat are performed. The upper and lower double lines are realized, the operation is flexible, the sewing effect is good, and the carrying is convenient.

Drawings

FIG. 1 is a schematic structural diagram 1 of the present invention;

FIG. 2 is a schematic structural diagram of the present invention 2;

FIG. 3 is a schematic structural view of a linkage mechanism according to the present invention;

FIG. 4 is a schematic view of the linkage mechanism of the present invention with the clamping plate B removed;

FIG. 5 is a front view of the linkage mechanism of the present invention with clamping plate B removed;

FIG. 6 is a schematic view of the feed dog seat and feed dog of the present invention;

FIG. 7 is a top view of a feed dog seat, feed dog of the present invention;

FIG. 8 is a schematic structural view of a branch pull rod B and a cam of the present invention;

FIG. 9 is a schematic structural diagram of a shuttle and a shuttle seat according to the present invention;

fig. 10 is a plan view of the shuttle and the shuttle seat of the present invention.

Reference numerals:

1. the cloth feeding device comprises a linkage mechanism, 2 bases, 3, a pressure head, 4, a needle, 5, a bolt, 6, a pressure foot, 7, a wire adjusting wheel, 8, a spring, 9, a shifting fork, 10, clamp plates A, 11, a crank throw A, 12, branch pull rods A, 13, a cloth feeding tooth seat, 14, a cloth feeding tooth, 15, clamp plates B, 16, branch pull rods B, 17, a cam, 18, a shuttle, 19, a shuttle seat, 20, a crank throw B, 21, a power rod, 22, a crank throw C, 23, branch pull rods B, 24, a crank throw D, 25, contacts C, 26, contact shoulders B, 27, contacts a,28, contact shoulders f,29, contacts e, 30, contact shoulders D, 31, contacts h, 32, contact shoulders i, 33 and contact shoulders g.

Detailed Description

The details of the embodiments, structures, features and functions according to the present invention are described in the following detailed description and the preferred embodiments.

The invention relates to a hand-held sewing machine with a flying shuttle bottom line, which comprises a linkage mechanism 1, a base 2 and a pressing beam 3, wherein the base is provided with a base; a sewing machine needle 4 is installed at one end of a press beam 3 and is screwed into a fixed needle bolt 5 for fixing, a thread adjusting button 7 is installed on the side face of the press beam 3, the thread adjusting button 7 is connected with a thread wheel in the press beam 3, the belly of the press beam 3 is connected with one end of a compression spring 8, the other end of the compression spring 8 is connected with a base 2, the press beam 3 is clamped into the base 2 and is inserted into a shaft for hinging, a linkage mechanism 1 is installed in the base 2, the linkage mechanism 1 is connected with the press beam 3, and the press beam 3 is fixedly connected with.

The linkage mechanism 1 consists of a shifting fork 9, a clamping plate A10, a crank throw A11, a branch pull rod A12, a cloth feeding tooth seat 13, a cloth feeding tooth 14, a clamping plate B15, a branch pull rod B16, a cam 17, a flying shuttle 18, a flying shuttle seat 19, a crank throw B20, a power rod 21, a crank throw C22, a branch pull rod B23 and a crank throw D24, wherein the clamping plate A10 and the clamping plate B15 are respectively clamped between the power rod 21 and the crank throw C22, the upper end of the crank throw C22 is hinged with one end of a graft pull rod B23, the other end of the branch pull rod B23 is hinged with one end of a crank throw A11, the crank throw A11 is inserted into a pin connecting clamping plate A10 and the clamping plate B15, the other end of the crank throw A15 is hinged with one end of the graft pull rod A15, the other end of the branch pull rod A15 is hinged with the cloth feeding tooth seat 13, the cloth feeding tooth seat 13 is provided with a cloth feeding tooth 14, two cam clamping plates A17 are inserted into two clamping plates B3617, the two ends of the two clamping plate B15 and the two ends of the branch pull rod B15, the crank throw D24 is inserted into the pin connecting splint A10 and the splint B15, the flying shuttle seat 19 is arranged on the convex strips arranged on the splint A10 and the splint B15, the flying shuttle 18 is arranged in the flying shuttle seat 19, one end of the crank throw B20 is inserted under the flying shuttle seat 19, the other end of the crank throw B20 is inserted into the pin connecting splint A10 and the splint B15, the lower end of the power rod 21 is inserted into one end of the pin connecting shifting fork 9, the middle part of the shifting fork 9 is inserted into the pin connecting splint A10 and the splint B15, and the lever arranged at the lower end of the pressure beam 3 is inserted into the rotating sleeve arranged at the other end of the shifting.

A method of moving a hand-held sewing machine having a fly bobbin thread, wherein;

1) when the feed dog 14 is at the highest position, the cam 17 is at the right position of the shuttle 18 and the shuttle seat 19 in the vertical state, when the beam 3 is pressed downwards by hand when sewing is carried out, the shifting fork 9 drives the power rod 21 to move downwards, the contact shoulder i32 of the power rod 21 pushes the contact point h31 of the crank D24 to make the crank D24 shift the branch pull rod B16 rightwards, the cam 17 rotates clockwise around the axis of the cam under the drive of the branch pull rod B16 until the cam rotates to the lowest position of the cam, so that the feed dog seat 13 is vertically fallen below a sewing plane, and the presser foot 6 and the cloth at the moment fall along with the feed dog seat 13 and finally fall on the plane of the base 2;

2) when the power rod 21 continues to move downwards, the contact shoulder f28 of the power rod 21 is pressed against the contact e29, the contact e29 drives the crank throw C22 to move, the crank throw C22 drives the branch pull rod B23 to move, the branch pull rod B23 drives the crank throw A11, the crank throw A11 drives the branch pull rod A12 to push the cloth feeding tooth holder 13 to the right terminal point, and the next lifting is waited;

3) meanwhile, the contact shoulder B26 of the power rod 21 abuts against the contact a27, the contact a27 drives the crank throw B20 to rotate in the anticlockwise direction, and the crank throw B20 drives the shuttle seat 19 to enable the shuttle 18 to fly from the right position to the left position;

4) when the needle point of the sewing machine needle 4 starts to move downwards from the upper stop point until the needle point of the sewing machine needle 4 is 1 mm away from the shown presser foot 6, the actions of 1, 2 and 3 are completed until the needle point of the sewing machine needle 4 reaches the lower stop point, which is the state.

5) When the pressing beam 3 is released by hand, the sewing machine performs lower half part sewing work under the action of the elastic force of the compression spring 8, the shifting fork 9 shifts the power rod 21 to move upwards under the action of the compression spring 8, the contact c25 on the power rod 21 is already below the contact a27, when the power rod 21 moves upwards, the contact c25 pushes against the contact a27, the crank B20 drives the shuttle seat 19 to fly the shuttle 18 from the left position to the right position of the figure, and the purpose that the shuttle passes through the upper thread is completed;

6) when the contact shoulder i32 on the power rod 21 reaches the position below the contact point h31 and the power rod 21 moves upwards, the contact shoulder g33 pushes against the contact point h31 to drive the crank throw D24 to rotate in the anticlockwise direction, so that the draw branch pull rod B16 moves rightwards, the cam 17 rotates leftwards along the axis of the cam 17 to become an upright state, and the presser foot 6 and the cloth feeding tooth seat 13 are vertically lifted upwards to prepare for horizontal cloth feeding;

7) when the cloth feeding tooth seat 13 is in an upright state, the contact shoulder d30 on the power rod 21 just props up the contact point e29 from the lower direction, so that the crank throw C22 is driven to drive the branch pull rod B23 to move, the branch pull rod B23 drives the crank throw A11, and the crank throw A11 drives the branch pull rod A12 to horizontally translate the cloth feeding tooth seat 13 leftwards, so that the work of feeding cloth forwards is completed;

8) when the sewing machine needle 4 starts to lift upwards at the bottom dead center, when the needle point of the sewing machine needle 4 rises by 1.5 mm, the upper thread on the sewing machine needle 4 forms a thread sleeve, the action of the flying shuttle 11 for threading is performed at the moment, the sewing machine needle 4 continues to rise at the moment, and when the height of the needle point of the sewing machine needle 4 exceeds the upper plane of the presser foot 6 of the sewing machine needle 4 by 2 mm, the action of vertical rising and horizontal leftward cloth feeding of the cloth feeding tooth seat 13 are performed.

The shuttle 18 is olive shaped and can move left and right on a groove arranged on the shuttle seat 19.

The shuttle seat 19 can move left and right.

The power rod 21 is provided with a plurality of convex curves which can move up and down.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.