CN210796879U

CN210796879U - Trimming and presser foot lifting integrated device

Info

Publication number: CN210796879U
Application number: CN201921524911.9U
Authority: CN
Inventors: 周善足; 蒋达淼; 林新博; 周毅伟
Original assignee: Taizhou Supu Electrical Co ltd
Current assignee: Taizhou Supu Electrical 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 trimming lifts integrative device of presser foot belongs to sewing machine technical field. A trimming and presser foot lifting integrated device comprises a rotary power source fixedly arranged on one side of a machine shell, a cam is connected to one side of the rotary power source, trimming driving portions and lifting and pressing driving portions are respectively arranged on two sides of the cam, and a cutter driving shaft and a presser foot lifting plate assembly are respectively and independently connected under the driving of the cam. According to the technical scheme, the operation of thread trimming and presser foot lifting can be realized by respectively and independently controlling from one power source. Moreover, the design structure is simple, the design is ingenious, and compared with the traditional function which needs two electromagnets, the function can be realized only by one rotary power source. But also greatly reduces the product cost.

Description

Trimming and presser foot lifting integrated device

Technical Field

The utility model belongs to the technical field of sewing machine, refer in particular to a trimming lifts integrative device of presser foot.

Background

At present, the functions of a computerized flat sewing machine are more and more, and the most common functions are the functions of automatic thread trimming and automatic presser foot lifting. And at least two electromagnets and other mating parts are required for these functions. Thus, although the functions are added to improve the production efficiency, the production cost is greatly increased. Therefore, a low-cost way for realizing thread trimming and presser foot lifting is needed.

Patent documents already published in a patent database are a utility model patent, and the patent number is 201620830633X, the patent name: a driving device for automatically trimming and lifting a presser foot. The driving device comprises a presser foot lifting transmission rod, a thread trimming transmission rod, a stepping motor, a cam body arranged on the stepping motor, a presser foot lifting connecting rod and a thread trimming connecting rod; the cam body is provided with a pressure raising and pressing pin driving cam surface and a trimming driving cam surface which both comprise a base circular surface and a lift curved surface; the other end of the pressure foot lifting connecting rod is hinged to one end of the pressure foot lifting transmission rod, and a first driven pin is arranged on the pressure foot lifting connecting rod; the other end of the thread trimming connecting rod is hinged with a thread trimming transmission rod, and a second driven pin is arranged on the thread trimming connecting rod; when the stepping motor drives the cam body clockwise for a certain angle, one driven pin enters the lift curved surface from the base circular surface, and the other driven pin slides on the base circular surface; when the cam is rotated anticlockwise, the other driven pin enters the lift curved surface from the base circular surface, and the one driven pin slides on the base circular surface.

It can be seen from the above technical solutions that the technical solution provided by the customer can only be installed at the bottom plate of the casing, but the installation at the bottom plate has a problem of conflict with the lubrication system, and the problem of being easily stuck by the thread end at the bottom of the casing after long-term use. And such a design is also very inconvenient in later maintenance.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a can realize the equipment of trimming and lift the presser foot simultaneously and can not meet with lubricating system's conflict again and the problem that is blocked by the end of a thread.

The purpose of the utility model is realized like this: the utility model provides a trimming lifts integrative device of presser foot, is including setting firmly the rotary power source in the long rear side of limit of aircraft nose, and rotary power source one side is connected with the cam, and the cam both sides are provided with trimming drive division respectively and lift and press the drive division and under cam drive respectively independent connection have the trimming subassembly and lift presser foot lifter plate subassembly.

Preferably, the thread cutting driving part comprises a thread cutting push rod; the lifting and pressing driving part comprises a lifting and pressing push rod; the two sides of the cam are respectively provided with the thread trimming push rod and the lifting and pressing push rod.

Preferably, one side of the thread trimming push rod and one side of the pressure lifting push rod are respectively hinged with a thread trimming pull rod assembly and a pressure lifting pull rod, and the thread trimming pull rod assembly drives the thread trimming assembly 35 to move under the action of the thread trimming push rod; one end of the lifting and pressing pull rod is hinged with the upper end of the lifting and pressing push rod.

Preferably, the upper end parts of the lifting and pressing pull rod and the trimming pull rod assembly are connected through a return spring.

Preferably, a gap is formed between the trimming push rod and the cam, and a limiting block is respectively arranged on the inner sides of the trimming push rod and the lifting push rod.

Preferably, the wire-cutting pull rod assembly at least comprises a first transverse pull rod, a first vertical shaft and a second transverse pull rod which are sequentially connected, and the first vertical shaft and the second transverse pull rod are respectively provided with a vertical pulling eccentric part and a transverse 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 trimming and presser foot lifting integrated device further comprises a firing piece arranged on one side of the cutter driving shaft, and the firing piece is used for driving the cutter driving shaft to axially move; one end of the second transverse pull rod is hinged with one end of a firing piece, and the other end of the firing piece is hinged to the machine head.

Preferably, the other end of the firing part is hinged with a connecting bracket, one end of the connecting bracket is formed with a connecting rod, and the lower end of the connecting rod is hinged with the firing part; and a fixing part is formed at one end of the connecting support and is fixedly connected with the machine head through a fastener.

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 positioning sleeve, one end of the upper positioning sleeve is fixedly arranged in the machine head through a formed fixing edge, the first vertical shaft is sleeved with a lower positioning sleeve, and the lower positioning sleeve is fixedly arranged in a shaft hole of the machine head.

Preferably, the pressure lifting driving part comprises a pressure lifting push rod and a pressure lifting pull rod, and one end of the pressure lifting pull rod is hinged with the upper end part of the pressure lifting foot lifting plate assembly; the other end of the lifting and pressing pull rod is hinged with the upper end of the lifting and pressing push rod, and the lower end of the lifting and pressing push rod is rotatably arranged through a fixing pin.

Preferably, one side of rotary power source is provided with the installing support, and the installing support shaping has the aircraft nose fixed part and supports to lean on connecting portion, and the aircraft nose fixed part is used for connecting and fixing on the aircraft nose, supports to lean on connecting portion to be used for articulated respectively to have the trimming push rod and lift and press the push rod.

Preferably, a bending area is arranged between the machine head connecting part and the abutting connecting part, and the bending area is used for penetrating through the machine head and enabling the abutting connecting 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.

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

according to the technical scheme, the operation of thread trimming and presser foot lifting can be realized by respectively and independently controlling from one power source. Moreover, the design structure is simple, the design is ingenious, and compared with the traditional function which needs two electromagnets, the function can be realized only by one rotary power source. But also greatly reduces the product cost. And because the device is arranged at the rear side of the long edge of the handpiece, the contact and the conflict with the lubricating system and the thread end can be avoided. Thereby the equipment operation is more stable.

Drawings

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

FIG. 2 is a schematic view of the device of FIG. 1 after the head half has been hidden;

FIG. 3 is an enlarged view of a portion of FIG. 2 at C;

FIG. 4 is one of the schematic structural illustrations of FIG. 2 after the rotational power source position has been moved;

FIG. 5 is a second schematic view of the structure of FIG. 2 after the rotational power source position has been moved;

FIG. 6 is a schematic view of the structure of FIG. 2 after the other half of the head has been hidden;

FIG. 7 is a schematic view of the structure of FIG. 6 after the foot lift plate assembly is hidden;

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

FIG. 9 is a simplified schematic illustration of the hidden component of FIG. 8 after the thread trimming apparatus;

FIG. 10 is a schematic view of the device after the half-head has been hidden;

FIG. 11 is a schematic view of the structure of FIG. 10 after the other half of the head has been hidden;

FIG. 12 is an enlarged view of a portion of FIG. 11 at A;

FIG. 13 is a schematic view of a mounting bracket;

fig. 14 is a third schematic diagram of a practical application of the present invention.

In the figure: 1-machine head; 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 nose connection; 27-a bending zone; 28-installing a positioning sleeve; 29-fixed edge; 30-lower positioning sleeve; 31-a return spring; 32-a limiting block; 33-a fixed seat; 34-connecting a rocker; 35-thread trimming assembly.

Detailed Description

The invention will be further described with reference to specific embodiments.

The first embodiment is as follows: as shown in fig. 1-14, a trimming and presser foot lifting integrated device comprises a rotary power source 2 fixedly arranged at the rear side of the long edge of a machine head 1, a cam 3 connected with one side of the rotary power source 2, a trimming driving part and a presser foot lifting driving part respectively arranged at two sides of the cam 3, and a trimming assembly 35 and a presser foot lifting plate assembly 6 respectively and independently connected under the driving of the cam 3.

This technical scheme specifically discloses the structural design that can lower cost realize automatic trimming and lift the presser foot automatically. The design of this technical scheme both can be alone to trimming or to lifting the presser foot and operating, also can integrate and realize just can accomplishing two actions from same power supply together. The head 1 described in the present technical solution refers to a housing of a sewing machine, and this feature is only used for convenience of description, and is not a technical feature to which the present product belongs. Similarly, the thread trimming assembly 35, the pressure raising assembly, the cutter driving shaft in the thread trimming assembly 35, and the pressure raising and lowering plate assembly 6 all belong to inherent parts in the sewing machine, and are only used for convenience of description, but are not necessary technical features of the product.

The technical scheme is realized by the following steps that firstly, a rotary power source 2 is needed, and the power source can rotate, be manually driven, or be driven by a motor or other parts capable of rotating. Preferably the present solution preferably uses a stepper motor as a preferred choice for the rotary power source 2. The stepping motor has the advantages that the rotating angle of the stepping motor is accurate, and particularly, the rotating angle and the rotating speed of the stepping motor can be accurately controlled by matching with an electric control system. The design can control the lifting height and speed of the presser foot when the cam 3 rotates towards one side of the lifting and pressing driving part, and can control the advancing stroke and speed of the cutter driving shaft 5 when the cam 3 rotates towards one side of the trimming driving part.

Meanwhile, the position of the rotary power source 2 is arranged on one side of the machine head 1, specifically, the side of the long edge of the machine head 1 is the side of the machine head 1 on which the mounting window is formed. Preferably in a position midway to the rear side of the long side. The placing position can simultaneously realize the functions of trimming and lifting the presser foot. And therefore may be placed in other locations if only one of the functions is to be performed.

The cam 3 according to the present disclosure is preferably a symmetrical cam 3, so that the corresponding function can be realized by driving the rotary power source 2, regardless of the left or right direction. The thread cutting driving portion according to the present invention is a component capable of driving the thread cutting assembly 35 to move back and forth under the action of the cam 3.

Specifically, the thread trimming assembly 35 in the present technical solution refers to components other than the thread trimming electromagnet, such as the cutter driving shaft 5, the thread trimming cam 3 crank assembly, the movable knife holder, and the like, which are used for realizing automatic thread trimming in the conventional flat sewing machine. 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. The thread cutting drive is a component capable of driving the axial movement of the cutter drive shaft 5. This component can be a crank mechanism or a cylinder or other similar functional component.

The pressure lifting assembly in the technical scheme refers to a component for automatically lifting the pressure foot in the traditional lockstitch sewing machine. The lifting device at least comprises a lifting foot and lifting plate component 6, and the functions and actions of the lifting foot and lifting plate component 6 belong to the conventional means of the technicians in the field, and are not described in detail herein. The lifting and pressing driving part is used for pulling the lifting and pressing foot lifting plate assembly 6 to rotate so as to realize lifting of the pressing foot.

Therefore, the technical scheme can respectively and independently control the operation of trimming and lifting the presser foot from one power source. Moreover, the design structure is simple, the design is ingenious, and compared with the traditional function which needs two electromagnets, the function can be realized only by one rotary power source 2. But also greatly reduces the product cost.

Preferably, the thread cutting driving part comprises a thread cutting push rod 4 and a thread cutting pull rod assembly, the thread cutting push rod 4 is arranged on one side of the cam 3, and the thread cutting pull rod assembly drives the cutter driving shaft 5 to axially move under the action of the thread cutting push rod 4.

The technical scheme specifically discloses a structural form of a trimming driving part. In actual use, the trimming push rod 4 is used to achieve abutment against the cam 3. Therefore, when the cam 3 rotates towards the direction of the thread cutting push rod 4, the thread cutting push rod 4 can be driven to move, and further the thread cutting pull rod assembly is driven to move, so that the axial movement of the cutter driving shaft 5 is finally realized.

The thread trimming pull rod assembly in the technical scheme can be diversified in form, and only the axial movement of the driving cutter driving shaft 5 can be finally realized. The concrete structure can be realized by dragging a rope or a crank connecting rod mechanism or connected by a ratchet mechanism. The connection mode can grasp the core action realized by the thread cutting function. The mode is various, simple nimble.

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.

Preferably, the wire-cutting pull rod assembly at least comprises a first transverse pull rod 7, a first vertical shaft 8 and a second transverse pull rod 9 which are sequentially connected, and the first vertical shaft 8 and the second transverse pull rod 9 are respectively provided with a vertical pulling eccentric part 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, 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 the 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 follow the power transmission that aircraft nose 1 one side arouses to being located on the cutter drive shaft 5 of aircraft nose 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.

Preferably, the vertical pulling eccentric part and/or the transverse pulling eccentric part 11 is a crank, a central hole part 12 is formed on the 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 the 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 trimming and presser foot lifting integrated device further comprises a firing member 14 arranged on one side of the cutter driving shaft 5, and the firing member 14 is used for driving the cutter driving shaft 5 to move axially; one end of the second cross pull rod 9 is hinged with one end of a firing part 14, and the other end of the firing part 14 is hinged on the machine head 1.

The technical scheme specifically discloses a structural design for triggering the axial movement of the cutter driving shaft 5. The position of the firing member 14 is located on the side of the bottom plate of the handpiece 1, and the working principle is that when the second cross-bar 9 receives a moving force from the crank, due to the hinged relationship between the firing member 14 and the second cross-bar 9, and the other end of the firing member 14 is hinged on the handpiece 1, the firing member 14 can generate a horizontal movement, so that the axial movement of the cutting knife driving shaft 5 can be realized.

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; and 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 head 1 through a fastener.

The technical scheme specifically discloses an installation mode of the firing piece 14. Is rotatably connected to the handpiece 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 to the handpiece 1.

Preferably, the first tie rod 7 is formed with a vertical portion 18, a torsion portion 19 and a transverse portion 20, one side of the vertical portion 18 is connected with the trimming push rod 4, and the trimming push rod 4 is a vertically arranged plate; the transverse portion 20 is connected with a vertical pulling eccentric portion. An upper locating sleeve 28 is sleeved outside the first vertical shaft 8, one end of the upper locating sleeve 28 is fixedly arranged in the machine head through a fixing edge 29 formed in the outer portion of the first vertical shaft 8, a lower locating sleeve 30 is sleeved outside the first vertical shaft 8, and the lower locating sleeve 30 is fixedly arranged in a shaft hole of the machine head.

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 head through a fixing edge 29 formed by molding under the condition that the original structure of the machine head is not changed, and the fixing edge 29 is connected with the machine head through a fastener. The lower positioning sleeve 30 can be directly installed on the original hole site, which is very convenient.

Preferably, the lifting and pressing driving part comprises a lifting and pressing push rod 21 and a lifting and pressing pull rod 22, and one end of the lifting and pressing pull rod 22 is hinged with the upper end part of the lifting and pressing foot lifting plate assembly 6.

This technical scheme specifically discloses a lift structure principle who presses drive division. Specifically, in the field of a flat sewing machine, to lift the presser foot, one of the core actions is to drive the upper end of the presser foot lifting plate assembly 6 to rotate.

Firstly, a presser foot lifting and lifting plate assembly 6 is simply introduced, the middle part of the traditional presser foot lifting and lifting plate assembly 6 is rotatably arranged in a machine head 1, the upper end of the traditional presser foot lifting and lifting plate assembly is connected with a tooth lifting foot pull rod with a drag hook, and one end of the tooth lifting foot pull rod is sequentially connected with a rear presser foot lifting lever, a presser foot lifting ejector rod and an electromagnet assembly. In daily work, the electromagnet is driven to further enable the tooth lifting foot pull rod to pull the upper end portion of the presser lifting foot lifting plate assembly 6 to enable the presser lifting foot to rotate, and therefore the presser lifting foot is driven to lift. The specific structure principle belongs to the common general knowledge in the field of flat sewing machines, and is not described in detail herein.

Therefore, the prior art presser foot lifting assembly is usually realized by an electromagnet. Therefore, the machine head 1 is required to be changed, and an electromagnet assembly is required to be added, so that the cost is high and the service life is short.

In the technical scheme, a pressure lifting push rod 21 is designed to receive power transmitted from the cam 3, and then the pressure lifting pull rod 22 is connected with the upper end part of the pressure lifting foot lifting plate assembly 6, so that the upper end part of the pressure lifting foot lifting plate assembly 6 can be hinged. Thereby, the operation of lifting the presser foot can be realized. Meanwhile, the control of the height of the presser foot lifting can be realized by the operation mode, specifically, the rotation angle of the stepping motor is further controlled to control the rotation angle of the cam so as to control the operation stroke of the presser foot lifting pull rod 22, and finally the rotation angle control of the presser foot lifting plate assembly 6 is realized, so that the control of the height of the presser foot lifting is realized.

Preferably, the other end of the lifting and pressing pull rod 22 is hinged to the upper end of the lifting and pressing push rod 21, and the lower end of the lifting and pressing push rod 21 is rotatably arranged through a fixing pin 23.

The technical scheme specifically introduces a connection mode of the pressure lifting pull rod 22 and the pressure lifting push rod 21 and a fixing mode of the pressure lifting push rod 21. The lifting push rod 21 can have a pivot point for rotation by being rotatably arranged with the fixed pin 23. Meanwhile, the connection mode of the fixing pin 23 can be diversified, and two lugs can be added in the machine head 1 to connect the fixing pin 23. Or by providing a bracket at the side connected to the rotary power source 2 and fixing by means of the rotary power source 2. This drives the movement of the lift-press lever 22 when the cam 3 is rotated.

The same operating mode can also be used for the operation of the thread trimming pusher 4.

Preferably, one side of the rotary power source 2 is provided with a mounting bracket 24, the mounting bracket 24 is formed with a machine head connecting portion 26 and an abutting connecting portion 25, the machine head connecting portion 26 is used for connecting and fixing on the machine head 1, and the abutting connecting portion 25 is used for respectively articulating with the trimming push rod 4 and the lifting push rod 21. A bending area 27 between the machine head connecting part 26 and the abutting connecting part 25, wherein the bending area 27 is used for penetrating through the machine head 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 head 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 nose coupling part 26 and an abutment coupling part 25. The handpiece coupling portion 26 is adapted to be secured to the handpiece 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: the present embodiment is basically the same as the first embodiment, and the difference is: the lifting and pressing pull rod 22 is connected with the upper end part of the thread trimming pull rod assembly through a return spring 31; gaps are arranged between the trimming push rod 4 and the lifting and pressing push rod 21 and the cam 3, and the inner sides of the trimming push rod 4 and the lifting and pressing push rod 21 are respectively provided with a limiting block 32.

The technical scheme specifically discloses a technical scheme for realizing resetting after trimming. And the time difference between the two actions of trimming and lifting and pressing can be skillfully utilized to realize the reset operation of the other component.

However, the same function of return can also be achieved independently by using a spring in each of the lift-press lever 22 and the shear lever assembly. But the mode of the embodiment can reduce the cost of one spring.

The stopper 32 may be fixed to the head or may be fixed to one side of the rotary power source 2. The stopper 32 is mainly used to control the limit position and prevent over-rotation. The size of the gap and the position and size relationship between the stopper 32 and the cam 3 are not important in this application, and are not described herein.

Example three: the present embodiment is basically the same as the first embodiment, and the difference is: the lower ends of the trimming push rod 4 and the lifting push rod 21 are connected with a fixed seat 32. The fixed seat 32 can be fixedly connected with the casing or the motor.

Example four: the present embodiment is basically the same as the first embodiment, and the difference is: in the first embodiment, the power source is changed from the horizontal state to the vertical state by the vertical pulling eccentric part and the horizontal pulling eccentric part. The present embodiment provides another embodiment. As shown in fig. 11, the connecting rocker 34 is a plate-shaped object with three hinge parts, and the three hinge parts are respectively connected with the first tie rod 7 and the first vertical shaft 8. The other hinge part is rotatably arranged on the machine shell to realize the function similar to a seesaw. The design structure is simple and clear. Is the preferred structural design.

Example five: the present embodiment is basically the same as the first embodiment, and the difference is: as shown in fig. 2-7, the line-cutting mode after the first vertical shaft 8 swings is different, and specifically, when the connecting rocker 34 rotates, the first vertical shaft 8 is driven to move up and down, and then an eccentric structure is driven, as shown in fig. 6 and 7, the up and down movement is converted into a rotational movement. Which in turn drives a shear spool to rotate, the position of the shear spool being the major axis between the labels "35" and "8" in fig. 6. The rotation of the thread cutting shaft is around the axis thereof, and then the thread cutting assembly 35 can be driven to rotate, thereby realizing the thread cutting operation.

The structure principle is that the firing piece is not arranged, and the structure is another new structure.

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. The utility model provides a trimming lifts integrative device of presser foot which characterized in that: the device comprises a rotary power source (2) fixedly arranged on the rear side of a long edge of a machine head (1), wherein one side of the rotary power source (2) is connected with a cam (3), two sides of the cam (3) are respectively provided with a trimming driving part and a lifting and pressing driving part, and the trimming component (35) and the lifting and pressing foot lifting plate component (6) are respectively and independently connected under the driving of the cam (3).

2. The trimming and presser foot lifting integrated device according to claim 1, wherein: the trimming driving part comprises a trimming push rod (4); the lifting and pressing driving part comprises a lifting and pressing push rod (21); the two sides of the cam (3) are respectively provided with the trimming push rod (4) and the lifting and pressing push rod (21).

3. The trimming and presser foot lifting integrated device according to claim 2, wherein: one side of the trimming push rod (4) and one side of the lifting and pressing push rod (21) are respectively hinged with a trimming pull rod assembly and a lifting and pressing pull rod (22), and the trimming pull rod assembly drives the trimming assembly (35) to move under the action of the trimming push rod (4); one end of the lifting and pressing pull rod (22) is hinged with the upper end of the lifting and pressing push rod (21);

the pressure lifting pull rod (22) is connected with the upper end part of the thread trimming pull rod assembly through a return spring (31);

gaps are arranged between the trimming push rod (4) and the lifting and pressing push rod (21) and the cam (3), and the inner sides of the trimming push rod (4) and the lifting and pressing push rod (21) are respectively provided with a limiting block (32).

4. The trimming and presser foot lifting integrated device according to claim 3, wherein: the wire-cutting pull rod assembly at least comprises a first transverse pull rod (7), a first vertical shaft (8) and a second transverse pull rod (9) which are sequentially connected, 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).

5. The trimming and presser foot lifting integrated device according to claim 4, 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).

6. The trimming and presser foot lifting integrated device according to claim 4, wherein: 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).

7. The trimming and presser foot lifting integrated device according to claim 4, wherein: 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 head through a fixing edge (29) formed in the outer portion of the first vertical shaft, 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 head.

8. The trimming and presser foot lifting integrated device according to claim 4, wherein: the trimming and presser foot lifting integrated device further comprises a triggering piece (14) arranged on one side of the cutter driving shaft (5), and the triggering piece (14) is used for driving the cutter driving shaft (5) to axially move; one end of the second transverse pull rod (9) is hinged with one end of a firing part (14), and the other end of the firing part (14) is hinged on the machine head (1);

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); connecting bracket (15) one end shaping has fixed part (17), fixed part (17) through the fastener with aircraft nose (1) fastening connection.

9. The trimming and presser foot lifting integrated device according to claim 1, wherein: one side of rotary power source (2) is provided with installing support (24), and installing support (24) shaping has aircraft nose connecting portion (26) and supports and lean on connecting portion (25), and aircraft nose connecting portion (26) are used for connecting and fixing on aircraft nose (1), support and lean on connecting portion (25) to be used for articulated respectively have trimming push rod (4) and lift and press push rod (21).

10. The trimming and presser foot lifting integrated device according to claim 9, wherein: a bending area (27) between the machine head connecting part (26) and the abutting connecting part (25), wherein the bending area (27) is used for penetrating through the machine head and enabling the abutting connecting part (25) to be hinged with the trimming push rod (4) and the lifting and pressing push rod (21); the rotary power source (2) is a stepping motor, and the cam (3) is an involute cam; the lower end of the lifting and pressing push rod (21) is rotatably arranged through a fixed pin (23).