CN210796880U

CN210796880U - Thread trimming device

Info

Publication number: CN210796880U
Application number: CN201921524912.3U
Authority: CN
Inventors: 周善足; 蒋达淼; 林新博; 周毅伟
Original assignee: Taizhou Supu Electrical Co ltd
Current assignee: Zhejiang Supu Electromechanical Co ltd
Priority date: 2019-09-15
Filing date: 2019-09-15
Publication date: 2020-06-19
Anticipated expiration: 2029-09-15

Abstract

The utility model discloses a thread trimming device belongs to sewing machine technical field. The purpose of the utility model is realized like this: the utility model provides a thread trimming device, is including the drive arrangement who drives the thread trimming subassembly, drive arrangement is including the second drag link, and second drag link one end is articulated with the percussion piece, and the second drag link other end has set gradually first vertical axis and first drag link, and first drag link one side is connected with rotary power source. This technical scheme conveys the percussion piece with power from the casing upper end through the structure of many connecting rods, and then makes the percussion piece beat the cutter drive shaft and realize driving cutter drive shaft axial displacement and then realize the trimming, has thoroughly broken away from the electro-magnet constraint. Therefore, the problem that the shell is not suitable for refitting due to high cost and easy clamping is solved, and meanwhile, the line can be cut only by enabling the triggering part to rotate to hit the driving shaft of the cutting knife, so that the problem of service life is solved.

Description

Thread trimming device

Technical Field

The utility model belongs to the technical field of sewing machine, refer in particular to a thread trimming device.

Background

At present, the functions of a computer flat sewing machine are more and more, and automatic thread trimming is one of the indispensable functions. But the thread trimming mechanism of the existing flush joint machine is usually driven by adopting an electromagnet. Such structure often because the electro-magnet product is high in price and often because automatic trimming is the function that often will use in the flush joint machine use, the problem that practical life is not long often can appear in the electro-magnet under high frequency work. Meanwhile, the electromagnets are often arranged on the lower end face of the bottom plate, so that the phenomenon that the electromagnets are clamped by cloth scraps of clothes and cloth often occurs. Meanwhile, the existing installation mode needs to be installed when the sewing machine leaves a factory, and the common flat sewing machine cannot be realized through refitting.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a can long service life, can not have card shell and general repacking trimming device.

The purpose of the utility model is realized like this: the utility model provides a trimming device, is including the drive arrangement who drives the trimming subassembly, drive arrangement is including the second drag link, and the second drag link other end has set gradually first vertical axis and first drag link, and first drag link one side is connected with rotary power source.

Preferably, the first vertical shaft and the second horizontal pull rod are respectively provided with a vertical pulling eccentric part and a horizontal pulling eccentric part; the first transverse pull rod is connected with the upper end of the first vertical shaft through a vertical pulling eccentric part, the lower end of the first vertical shaft is connected with the second transverse pull rod through a transverse pulling eccentric part, and the second transverse pull rod is connected with a cutter driving shaft.

Preferably, the vertical pulling eccentric part and/or the horizontal pulling eccentric part is/are a crank, a central hole part is formed on the crank, and a horizontal connecting part for externally connecting the first transverse pull rod and/or the second transverse pull rod is formed on one side of the crank in an extending mode; the first vertical shaft is sleeved in the central hole part.

Preferably, the first tie rod is formed with a vertical part, a torsion part and a transverse part, one side of the vertical part is connected with the trimming push rod, and the trimming push rod is a vertically arranged plate; the transverse part is connected with a vertical pulling eccentric part; the first vertical shaft is sleeved with an upper locating sleeve, one end of the upper locating sleeve is fixedly arranged in the machine shell through a formed fixing edge, the first vertical shaft is sleeved with a lower locating sleeve, and the lower locating sleeve is fixedly arranged in a shaft hole of the machine shell; the rotary driving component further comprises a rotary power source fixedly arranged on one side of the long edge of the shell, one side of the rotary power source is connected with a cam, and one side of the cam is provided with a trimming push rod and a first transverse pull rod and drives the axial movement of the cutter driving shaft through the first transverse pull rod.

Preferably, one side of the rotary power source is provided with an installation support, the installation support is formed with a casing connecting part and an abutting connecting part, the casing connecting part is used for connecting and fixing on the casing, and the abutting connecting part is respectively hinged with a trimming push rod and a lifting and pressing push rod;

the bending area is used for penetrating through the shell and enabling the abutting connection part to be hinged with the trimming push rod and the lifting push rod; the rotary power source is a stepping motor, and the cam is an involute cam.

Preferably, the firing piece is hinged with the second cross pull rod to form a hinge joint and rotates around the hinge joint to drive the cutter driving shaft to axially move.

Preferably, the lower end of the firing piece is hinged with one end of a fixing support, and the firing piece is clamped with the cutter driving shaft.

Preferably, one end of the second tie rod is hinged with the left side of the rotary connecting plate; the lower end of the rotating connecting plate is hinged with the machine shell, and the right side of the rotating connecting plate is connected with a first vertical shaft.

Preferably, the lower end part of the rotary connecting plate is hinged with the machine shell through a mounting plate, and the left side of the mounting plate is fixedly arranged on the machine shell; the lower end of the mounting plate is hinged with the rotary connecting plate through a fastener.

Preferably, the middle part of the firing part is hinged with the shell through a fastener; the lower side of one end of the triggering piece is provided with a connecting column, and the connecting column and the cutter driving shaft are coaxially arranged.

Preferably, the thread cutting device comprises a firing part for driving the cutter driving shaft to axially move, and one side of the firing part is hinged with the second cross pull rod; one end of the second transverse pull rod is hinged with the firing piece, and the other end of the firing piece is hinged with a connecting bracket; and a fixing part is formed at one end of the connecting support and is fixedly connected with the shell through a fastening piece.

Compared with the prior art, the utility model outstanding and profitable technological effect is:

this technical scheme conveys the percussion piece with power from the casing upper end through the structure of many connecting rods, and then makes the percussion piece beat the cutter drive shaft and realize driving cutter drive shaft axial displacement and then realize the trimming, has thoroughly broken away from the electro-magnet constraint. Therefore, the problem that the shell is not suitable for refitting due to high cost and easy clamping is solved, and meanwhile, the line can be cut only by enabling the triggering part to rotate to hit the driving shaft of the cutting knife, so that the problem of service life is solved.

Drawings

FIG. 1 is one of the schematic structural diagrams for practical application of the present solution;

FIG. 2 is a second schematic diagram of the practical application of the present solution;

FIG. 3 is a simplified schematic illustration of the hidden portion of the trimming device of FIG. 2;

FIG. 4 is a schematic view of the device after the housing halves are hidden;

FIG. 5 is a schematic view of the present invention;

FIG. 6 is an enlarged view of a portion of FIG. 5 at A;

FIG. 7 is a schematic view of a mounting bracket;

FIG. 8 is a third schematic diagram of the practical application of the present solution;

FIG. 9 is a schematic structural diagram of a second embodiment of the present invention;

FIG. 10 is a simplified schematic illustration of the hidden portion of the thread trimming apparatus of FIG. 9;

FIG. 11 is an exploded view of the knife drive shaft and firing shaft;

FIG. 12 is a schematic structural diagram of a third embodiment of the present invention;

FIG. 13 is a schematic view of a fourth embodiment of the present invention;

fig. 14 is a second schematic configuration diagram of a fourth embodiment of the present invention.

In the figure: 1-a machine shell; 2-a source of rotational power; 3-a cam; 4-trimming the push rod; 5-a cutter drive shaft; 6-lifting the presser foot lifting plate component; 7-a first track rod; 8-a first vertical axis; 9-a second tie rod; 10-vertically pulling the eccentric part; 11-transversely pulling the eccentric part; 12-a central bore portion; 13-a horizontal connection; 14-a firing member; 15-connecting the stent; 16-a connecting rod; 17-a fixed part; 18-a vertical portion; 19-a torsion portion; 20-a transverse portion; 21-lifting and pressing the push rod; 22-lifting and pressing the pull rod; 23-a securing pin; 24-a mounting bracket; 25-abutting the connection; 26-a housing connection; 27-a bending zone; 28-installing a positioning sleeve; 29-fixed edge; 30-lower positioning sleeve 31-pull rope; 32-a firing shaft; 33-hemispherical protrusions; 34-a buffer end; 35-a fixed support; 36-a rotating connection plate; 37-a mounting plate; 38-connecting column.

Detailed Description

The present invention is further described below in terms of specific embodiments, as shown in fig. 1-14.

The first embodiment is as follows: a thread cutting device comprises a firing part 14 used for driving a cutter driving shaft 5 to move axially, one side of the firing part 14 is hinged with a driving device and forms a hinge joint, and the driving device is used for driving the firing part 14 to rotate around the hinge joint so as to drive the cutter driving shaft 5 to move axially.

The housing 1 according to the present embodiment is a housing of a sewing machine, and the features are only for convenience of description and are not technical features to which the present product belongs. The thread cutting principle of the existing sewing machine is generally completed by a thread cutting assembly, and the thread cutting assembly in the technical scheme refers to components except thread cutting electromagnets for realizing automatic thread cutting in the traditional flat sewing machine, such as a cutter driving shaft 5, a thread cutting cam 3, a crank assembly, a movable cutter holder and other components. The core action of the traditional thread cutting of the sewing machine is to drive the axial movement of the cutter driving shaft 5 through the thread cutting electromagnet. In the case of the conventional thread cutting arrangement, the thread cutting movement can therefore be carried out as long as the axial movement of the cutter drive shaft 5 is carried out. The purpose of simply processing the casing to achieve the modification during the installation and modification of the cutter driving shaft 5 is the conventional means of those skilled in the art and will not be described herein.

The working principle of the technical scheme is that one side of the firing piece 14 drives the device in an articulated mode and forms an articulated position. The meaning of this technical scheme articulated is can also realize relative rotation after connecting, and is like the articulated principle of scissors. The advantage of design like this does not need to install the electro-magnet on the bottom plate, consequently does not need the electro-magnet just reduced the cost just can not appear the phenomenon of card shell. Meanwhile, the technical scheme can realize the axial movement of the driving cutter driving shaft 5 and further realize the thread cutting by only utilizing the driving device to realize the swinging of the triggering piece 14.

The form of the driving device can be varied, and the following will specifically describe the structure of the driving device by means of various embodiments.

Preferably, the rotary driving assembly comprises a first transverse pull rod 7 and a first vertical shaft 8, and the first vertical shaft 8 and the second transverse pull rod 9 are respectively provided with a vertical pulling eccentric part 10 and a transverse pulling eccentric part 11; the first transverse pull rod 7 is connected with the upper end of the first vertical shaft 8 through a vertical pulling eccentric part 10, the lower end of the first vertical shaft 8 is connected with the second transverse pull rod 9 through a transverse pulling eccentric part 11, and the second transverse pull rod 9 is connected with a cutter driving shaft 5; this technical scheme specifically discloses a structural style of trimming pull rod subassembly. The specific implementation mode is that firstly, when the cam 3 rotates, the trimming push rod 4 can be driven to drive the first transverse pull rod 7 to horizontally rotate through the vertical pulling eccentric part; the vertical pulling eccentric part has the effect that the horizontal movement of the first transverse pull rod 7 can be converted into the rotation of the first vertical shaft 8, then the rotation of the first vertical shaft 8 drives the swing of the transverse pulling eccentric part 11, so that the horizontal movement of the second transverse pull rod 9 can be driven, and finally the axial movement of the cutter driving shaft 5 is realized through the horizontal movement of the second transverse pull rod 9, and then the automatic thread trimming function is realized.

This technical scheme just can realize will following the power transmission that casing 1 one side arouses to being located on the cutter drive shaft 5 of casing 1 bottom through three parts and the design of drawing eccentric portion and violently drawing eccentric portion 11. The structure is simple, effective and ingenious, and the transformation of the power direction is realized through the eccentric structure.

The vertical pulling eccentric part 10 and/or the transverse pulling eccentric part 11 is/are cranks, a central hole part 12 is formed on each crank, and a horizontal connecting part 13 for externally connecting the first transverse pull rod 7 and/or the second transverse pull rod 9 is formed on one side of each crank in an extending mode; the first vertical shaft 8 is fitted into the center hole portion 12. The technical scheme specifically discloses the structural design of the vertical pulling eccentric part and/or the horizontal pulling eccentric part 11. This crank design comprises two parts, one horizontal connecting part 13 and the other central hole part 12; the central hole portion 12 is used for fixing the first vertical shaft 8, and the fixing can be realized by opening an open slot at one side of the central hole portion 12 and then passing a fastener through the open slot. And a horizontal connecting part 13, wherein the horizontal connecting part 13 is used for connecting the first transverse pull rod 7 and the second transverse pull rod 9. The horizontal connection 13 may be shaped as a horizontally disposed platform and flush with the height of the upper surfaces of the first and

second tie rods

7, 9.

Preferably, the other end of the firing part 14 is hinged with a connecting bracket 15, one end of the connecting bracket 15 is formed with a connecting rod 16, and the lower end of the connecting rod 16 is hinged with the firing part 14; a fixing part 17 is formed at one end of the connecting bracket 15, and the fixing part 17 is fixedly connected with the machine shell 1 through a fastening piece; the technical scheme specifically discloses an installation mode of the firing piece 14. Is rotatably connected to the housing 1 by a connecting bracket 15. The connecting bracket 15 is composed of a fixed part 17 and a connecting rod 16, and the connecting rod 16 is hinged with the firing member 14, so that the firing member 14 has a pivot point for rotation when rotating. In addition, the fixing part 17 is skillfully fastened and connected by a fastener by virtue of a bulge inherent on the machine shell 1.

The first tie rod 7 is formed with a vertical part 18, a torsion part 19 and a transverse part 20, one side of the vertical part 18 is connected with the trimming push rod 4, and the trimming push rod 4 is a vertically arranged plate; the transverse part 20 is connected with a vertical pulling eccentric part 10; an upper positioning sleeve 28 is sleeved outside the first vertical shaft 8, one end of the upper positioning sleeve 28 is fixedly arranged in the machine shell through a formed fixing edge 29, a lower positioning sleeve 30 is sleeved outside the first vertical shaft 8, and the lower positioning sleeve 30 is fixedly arranged in a shaft hole of the machine shell; the technical scheme specifically discloses a structural form of a first tie rod 7. The trimming push rod 4 is a vertically arranged plate, so that in the actual connection process, in order to ensure smooth hinging, the first cross pull rod 7 is formed with a vertical part 18. Similarly, the design of the transverse portion 20 is required for the connection to the first vertical shaft 8 at the other end. A torsion portion 19 is therefore also designed between the vertical portion 18 and the transverse portion 20. The design ingeniously changes the rotating direction, and the connection of force transmission from the horizontal direction to the vertical direction is realized.

In addition, the technical scheme specifically discloses a fixing mode for the first vertical shaft 8. Specifically, the upper end and the lower end of the first vertical shaft 8 are respectively provided with an upper positioning sleeve 28 and a lower positioning sleeve 30, so that the first vertical shaft 8 can be fixed. Particularly, for the convenience of modification, one end of the upper positioning sleeve 28 is fixedly arranged in the machine shell through a fixing edge 29 formed by molding under the condition that the original structure of the machine shell is not changed, and the fixing edge 29 is connected with the machine shell through a fastening piece. The lower positioning sleeve 30 can be directly installed on the original hole site, which is very convenient.

The rotary driving component also comprises a rotary power source 2 fixedly arranged on one side of the long edge of the machine shell 1, one side of the rotary power source 2 is connected with a cam 3, one side of the cam 3 is provided with a trimming push rod 4 and a first transverse pull rod 7, and the axial motion of a cutter driving shaft 5 is driven by the first transverse pull rod 7; according to the technical scheme, the forward stroke and the forward speed of the cutter driving shaft 5 can be controlled when the cam 3 rotates towards one side of the trimming push rod 4. The cam 3 according to the present technical solution preferably adopts a symmetrical cam 3, and the trimming push rod 4 is used for realizing the abutment of the cam 3 in practical use. Therefore, when the cam 3 rotates towards the direction of the trimming push rod 4, the trimming push rod 4 can be driven to move, and further the trimming pull rod assembly is driven to move to finally realize the axial movement of the cutter driving shaft 5, so that the trimming push rod 4 can be driven to move under the action of the cam 3 through the driving of the rotary power source 2. The thread trimming push rod 4 in the technical scheme can also be made of various materials, shapes or structures, and specifically comprises a plate arranged along the radial direction of the cam 3, and the plate can be a spherical body or other objects capable of moving under the driving of the cam 3.

A mounting bracket 24 is arranged on one side of the rotary power source 2, a casing connecting part 26 and an abutting connecting part 25 are formed on the mounting bracket 24, the casing connecting part 26 is used for connecting and fixing on the casing 1, and the abutting connecting part 25 is used for respectively hinging a trimming push rod 4 and a lifting push rod 21; a bending area 27 between the machine shell connecting part 26 and the abutting connecting part 25, wherein the bending area 27 is used for penetrating through the machine shell and enabling the abutting connecting part 25 to be hinged with the trimming push rod 4 and the lifting push rod 21; the rotary power source 2 is a stepping motor, and the cam 3 is an involute cam. The technical scheme specifically discloses a fixing mode of a thread trimming push rod 4 and a lifting and pressing push rod 21. The manner in which these two parts are secured is important in practice because these two parts will necessarily be subjected to the impact force of the cam 3.

According to the technical scheme, the mounting bracket 24 is fixed on the machine shell 1, and the wire cutting push rod 4 and the lifting and pressing push rod 21 are connected through the mounting bracket 24. The specific principle is that the mounting bracket 24 is divided into two parts, one being a case connection part 26 and an abutting connection part 25. The case connecting portion 26 is adapted to be fixed to the case 1 by a fastener. The abutment connection 25 can then be realized by a shaft articulation with the trimming push rod 4 and the lift and press push rod 21. This allows the joint between the lower ends of the trimming push rod 4 and the lift push rod 21 and the abutting joint 25 to be a pivot point for rotation.

The selection of the stepping motor can be quickly and accurately operated according to the set angle through a computer program. In practical operation, in order to realize the thread cutting and the presser foot lifting, parameters such as the rotation angle, time, speed and the like of the stepping motor need to be controlled by a program, and the parameters belong to materials which can be obtained by routine experiments of a person skilled in the art and are not the key points of protection of the technical scheme, and are not described in detail herein.

Example two: preferably, the driving device comprises a pull rope 31, and one end of the pull rope 31 is connected with one side of the firing member 14; the other end of the pull rope 31 is connected to the rotary power source 2.

The technical scheme specifically discloses a structural form of a driving device. The pull rope 31 in the present technical solution is a flexible steel wire rope, which is also present in the existing automatic thread trimming mechanism, and thus can be purchased directly for use. The rotary power source 2 in the present technical solution has various structural designs, such as motor dragging or link pulling.

Preferably, the lower end part of one side of the firing piece 14 is provided with a firing shaft 32, and the firing shaft 32 is arranged at one end of the cutter driving shaft 5; the front end of the firing shaft 32 is formed into a hemispherical convex part 33, one end of the cutter driving shaft 5 is provided with a buffer end 34, and the buffer end 34 is formed into a groove matched with the convex part.

In this embodiment, the lower end of the firing member 14 has a firing shaft 32, and the firing shaft 32 and the firing member 14 can be integrally formed, or can be connected by welding, gluing, fastening, or by snapping. In actual use, the firing shaft 32 is driven by the firing member 14 to strike the cutter driving shaft 5, so that the firing shaft 32 is arranged coaxially with the cutter driving shaft 5. Moreover, the hemispherical convex part 33 can be slightly adjusted in the process of firing because of the matching relationship between the hemispherical convex part 33 and the groove.

Example three:

preferably, the driving device comprises a second tie rod 9, one end of the second tie rod 9 is hinged with the firing member 14, and the other end of the second tie rod 9 is provided with a rotary driving component and drives the second tie rod 9 to move through the rotary driving component.

The second cross-link 9 in this embodiment is primarily adapted to be connected to the firing member 14 and to a rotary drive assembly at its other end. This allows for a cutting action by rotating the drive assembly and connecting it to the firing member 14. The rotary driving component can be driven by a motor and can also be driven by a rope.

Preferably, the lower end of the firing part 14 is hinged with one end of a fixed bracket 35, and the firing part 14 is clamped with the cutter driving shaft 5.

The technical scheme particularly discloses a positioning mode of the firing piece 14. The firing member is fixed by fixing the fixing bracket 35 to the housing by hinging the fixing bracket 35 to the lower end of the firing member 14. Meanwhile, the triggering part 14 and the cutter driving shaft 5 can be clamped together by forming a notch on the triggering part 14 and clamping the cutter driving shaft 5 in the notch. Or a notch is formed by the cutter driving shaft 5, so that the firing part 14 is made into a plate, thereby realizing clamping.

Example four: the present embodiment is basically the same as the second embodiment, and the difference is that: preferably, the rotary driving assembly comprises a rotary connecting plate 36, one end of the second tie rod 9 is hinged to the left side of the rotary connecting plate 36, the lower end of the rotary connecting plate 36 is hinged to the casing, and the right side of the rotary connecting plate 36 is connected with a first vertical shaft 8.

This technical scheme specifically discloses a rotary drive subassembly's structural style. In practical use, the rotary connecting plate 36 is used for connecting the second tie rod 9 and the first vertical shaft 8 at the left side and the right side respectively. The first vertical shaft 8 has a downward driving force, and then the position where the left side of the rotating connecting plate 36 is hinged with the second cross-bar 9 swings downwards for a certain distance because the lower end of the rotating connecting plate 36 is hinged with the machine shell, so that the firing part 14 is driven to move left and right for a certain distance, and the axial movement of the scalpel driving shaft 5 is realized.

Preferably, the lower end of the rotary connecting plate 36 is hinged to the casing through a mounting plate 37, and the left side of the mounting plate 37 is fixedly arranged on the casing; the lower end of the mounting plate 37 is hinged to the swivel attachment plate 36 by a fastener.

The technical scheme specifically describes the installation position of the rotating connecting plate 36. The pivoting web 36 is hinged by a mounting plate 37 to form a fixed point which is also the pivot point for the pivoting. Such a hinge is simple and effective.

Preferably, the middle part of the firing part 14 is hinged with the shell through a fastener; a connecting column 38 is arranged at the lower side of one end of the firing part 14, and the connecting column 38 is arranged coaxially with the cutter driving shaft 5.

This embodiment illustrates that the fulcrum of the rotation of the firing member 14 is hinged to the housing at its middle portion by a fastener. Also, generally, the firing member 14 is located on the upper side of the cutter driving shaft 5, so that the firing member 14 is coaxially arranged with the cutter driving shaft 5, and a connecting column 38 is arranged on the lower side of one end of the firing member 14. And the striking operation of the cutter driving shaft 5 is realized through the connecting column 38.

The above-mentioned embodiment is only the preferred embodiment of the present invention, and does not limit the protection scope of the present invention according to this, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. A thread trimming device is characterized in that: the wire shearing device comprises a driving device for driving a wire shearing assembly, wherein the driving device comprises a second transverse pull rod (9), a first vertical shaft (8) and a first transverse pull rod (7) are sequentially arranged at the other end of the second transverse pull rod (9), and a rotary power source (2) is connected to one side of the first transverse pull rod (7).

2. The thread trimming apparatus according to claim 1, wherein: the first vertical shaft (8) and the second transverse pull rod (9) are respectively provided with a vertical pulling eccentric part (10) and a transverse pulling eccentric part (11); the first transverse pull rod (7) is connected with the upper end of the first vertical shaft (8) through a vertical pulling eccentric part (10), the lower end of the first vertical shaft (8) is connected with the second transverse pull rod (9) through a transverse pulling eccentric part (11), and the second transverse pull rod (9) is connected with a cutter driving shaft (5).

3. The thread trimming apparatus according to claim 2, wherein: the vertical pulling eccentric part (10) and/or the transverse pulling eccentric part (11) is/are cranks, a central hole part (12) is formed on each crank, and a horizontal connecting part (13) for externally connecting the first transverse pull rod (7) and/or the second transverse pull rod (9) is/are formed on one side of each crank in an extending mode; the first vertical shaft (8) is sleeved in the central hole part (12).

4. The thread trimming apparatus according to claim 1, wherein: the rotary driving component also comprises a rotary power source (2) fixedly arranged on one side of the long edge of the shell (1), one side of the rotary power source (2) is connected with a cam (3), one side of the cam (3) is provided with a trimming push rod (4) and a first transverse pull rod (7), and the axial movement of the cutter driving shaft (5) is driven through the first transverse pull rod (7); the first transverse pull rod (7) is formed with a vertical part (18), a torsion part (19) and a transverse part (20), one side of the vertical part (18) is connected with the trimming push rod (4), and the trimming push rod (4) is a vertically arranged plate; the transverse part (20) is connected with a vertical pulling eccentric part (10); an upper positioning sleeve (28) is sleeved outside the first vertical shaft (8), one end of the upper positioning sleeve (28) is fixedly arranged in the machine shell through a fixing edge (29) formed in the forming mode, a lower positioning sleeve (30) is sleeved outside the first vertical shaft (8), and the lower positioning sleeve (30) is fixedly arranged in a shaft hole of the machine shell.

5. The thread trimming apparatus according to claim 4, wherein: a mounting bracket (24) is arranged on one side of the rotary power source (2), a shell connecting part (26) and a propping connecting part (25) are formed on the mounting bracket (24), the shell connecting part (26) is used for being connected and fixed on the shell (1), and the propping connecting part (25) is used for being respectively hinged with a trimming push rod (4) and a lifting and pressing pull rod (21);

a bending area (27) between the machine shell connecting part (26) and the abutting connecting part (25), wherein the bending area (27) is used for penetrating through the machine shell and enabling the abutting connecting part (25) to be hinged with the trimming push rod (4) and the lifting and pressing pull rod (21); the rotary power source (2) is a stepping motor, and the cam (3) is an involute cam.

6. The thread trimming apparatus according to claim 4 or 5, wherein: the thread cutting device comprises a firing part (14) for driving the cutter driving shaft (5) to move axially, and one side of the firing part (14) is hinged with the second transverse pull rod (9); one end of the second transverse pull rod (9) is hinged with the firing piece (14);

the other end of the firing part (14) is hinged with a connecting bracket (15), one end of the connecting bracket (15) is formed with a connecting rod (16), and the lower end of the connecting rod (16) is hinged with the firing part (14); fixed part (17) are formed at one end of connecting support (15), and fixed part (17) pass through the fastener with casing (1) fastening connection.

7. The thread trimming apparatus according to claim 6, wherein: the firing piece (14) is hinged with the second transverse pull rod (9) to form a hinged position and rotates around the hinged position to drive the cutter driving shaft (5) to move axially.

8. The thread trimming apparatus according to claim 7, wherein: the lower end of the firing part (14) is hinged with one end of a fixing support (35), and the firing part (14) is clamped with the cutter driving shaft (5).

9. The thread trimming apparatus according to claim 7, wherein: one end of the second transverse pull rod (9) is hinged with the left side of the rotary connecting plate (36); the lower end of the rotating connecting plate (36) is hinged with the machine shell, and the right side of the rotating connecting plate (36) is connected with a first vertical shaft (8).

10. The thread trimming apparatus according to claim 9, wherein: the lower end part of the rotary connecting plate (36) is hinged with the machine shell through a mounting plate (37), and the left side of the mounting plate (37) is fixedly arranged on the machine shell; the lower end of the mounting plate (37) is hinged with the rotary connecting plate (36) through a fastener;

the middle part of the firing piece (14) is hinged with the shell through a fastener; a connecting column (38) is arranged on the lower side of one end of the firing piece (14), and the connecting column (38) and the cutter driving shaft (5) are coaxially arranged.