CN217203184U - Bottom shearing mechanism of buttonhole machine - Google Patents

Abstract

The utility model discloses a mechanism is cut at buttonhole maker bottom relates to sewing equipment technical field. In the bottom shearing mechanism of the buttonholing machine, the middle part of a bottom shearing line transmission plate is rotationally connected to a needle plate mounting plate through a transmission plate shaft, a bottom line guider and a shear control plate are respectively and fixedly arranged at two ends of the bottom shearing line transmission plate, and the bottom shearing line transmission plate is connected to a driving device; the lower thread trimming component comprises a lower thread trimming fixed cutter fixedly connected above the needle plate mounting plate and a lower thread trimming movable cutter rotatably connected above the lower thread trimming fixed cutter through a positioning pin, and a driving pin is arranged on the movable cutter. The driving device drives the shear bottom line driving plate to swing, so that the opening and closing between the movable knife and the fixed knife can be realized, when the movable knife and the fixed knife are opened, the bottom line guide device sends lines between the movable knife and the fixed knife, the structure of the lower trimming movable knife is simplified, the lower trimming fixed knife is fixed on the needle plate mounting plate, the lower trimming movable knife only needs to rotate around a shaft without other movements, the lower trimming assembly is convenient to process and assemble, and the trimming is stable.

Description

Bottom shearing mechanism of buttonhole machine

Technical Field

The utility model relates to a sewing machine technical field, in particular to mechanism is cut at buttonhole maker bottom.

Background

In the existing buttonhole sewing machine, a thread cutting assembly needs to hook threads by itself and then cut threads, the requirements on processing and assembling of the thread cutting assembly are high, the motion form of the thread cutting assembly is complex, and the stability of the thread cutting is influenced. Therefore, how to facilitate the processing and assembling of the trimming assembly and improve the stability of the trimming is a technical problem to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a buttonholing machine bottom shear mechanism, its processing and the convenient assembling of trimming subassembly, the stability of trimming is better.

In order to achieve the above object, the utility model provides a following technical scheme:

a bottom shearing mechanism of a buttonholing machine comprises a needle plate mounting plate, a driving device, a lower shearing line assembly and a bottom line shearing transmission plate;

the middle part of the bottom line shearing transmission plate is rotationally connected to the needle plate mounting plate through a transmission plate shaft, a bottom line guide device and a scissors control plate are fixedly arranged at two ends of the bottom line shearing transmission plate respectively, and the bottom line shearing transmission plate is connected to the driving device;

the lower thread trimming component comprises a lower thread trimming fixed cutter fixedly connected above the needle plate mounting plate and a lower thread trimming movable cutter rotatably connected above the lower thread trimming fixed cutter through a positioning pin, and a driving pin is arranged on the lower thread trimming movable cutter;

in the process that the driving device drives the bottom line shearing driving plate to rotate around the driving plate shaft along a first direction, the scissors control plate pushes the driving pin so that the lower line shearing movable knife rotates around the positioning pin and is opened relative to the lower line shearing fixed knife;

in the process that the driving device drives the bottom line shearing driving plate to rotate around the driving plate shaft along the second direction, the bottom line thread guide device moves towards the opening opened between the lower line shearing movable knife and the lower line shearing fixed knife, and the scissors control plate pushes the driving pin so that the lower line shearing movable knife rotates around the positioning pin and is closed relative to the lower line shearing fixed knife.

Preferably, the surface of the scissors control plate facing the drive pin comprises an opening push surface and a closing push surface, and the opening push surface and the closing push surface are respectively positioned on two sides of the drive pin;

in the process that the shear bottom line transmission plate rotates along the first direction, the shear control plate can push the driving pin through the opening push surface, and the closing push surface is separated from the driving pin; in the process that the shear bottom line transmission plate rotates towards the second direction, the shear control plate can push the driving pin through the closed pushing surface, and the open pushing surface is separated from the driving pin.

Preferably, the lower thread trimming assembly further comprises a lower thread trimming guard arranged above the lower thread trimming movable knife, and the lower thread trimming guard is fixedly connected with the needle plate mounting plate; and in the process that the driving device drives the bottom line shearing transmission plate to rotate along the second direction, the opening between the lower line shearing guard knife and the lower line shearing moving knife is gradually reduced to clamp the line.

Preferably, the needle plate mounting plate further comprises a lower thread stop assembly, and the driving device is further used for driving the lower thread stop assembly to move above the needle plate mounting plate.

Preferably, the wire retaining device further comprises a lower wire retaining rotating plate, the middle part of the lower wire retaining rotating plate is rotatably connected to the rotating plate shaft, one end of the lower wire retaining rotating plate is connected to the lower wire retaining device assembly, and the lower wire retaining rotating plate is connected with a baffle elastic piece;

the driving device is connected with a lower wire blocking transmission rod, so that the lower wire blocking transmission rod is driven by the driving device to be close to and push the lower wire blocking rotating plate to overcome the elastic force swing of the baffle elastic piece, or to be far away from the lower wire blocking rotating plate, so that the lower wire blocking rotating plate reversely swings under the elastic force of the baffle elastic piece and pushes the lower wire blocking assembly.

Preferably, the bottom line shearing connecting rod assembly further comprises a bottom line shearing connecting rod assembly, the bottom line shearing connecting rod assembly comprises a front bottom line connecting rod and a rear bottom line connecting rod, the front bottom line connecting rod is rotatably connected to a front rod rotating shaft, the driving device is in transmission connection with the front bottom line connecting rod so as to drive the front bottom line connecting rod to swing around the front rod rotating shaft, and the rear bottom line connecting rod is connected with the bottom line shearing transmission plate; the front bobbin thread connecting rod is provided with a front connecting rod hole, the rear bobbin thread connecting rod is provided with a rear connecting rod hole, and the front connecting rod hole is fixedly connected with the rear connecting rod hole through a detachable eccentric pin shaft.

Preferably, the lower wire blocking transmission rod is rotatably connected to a rod blocking shaft, one end of the lower wire blocking transmission rod is connected to the front bottom wire connecting rod, the other end of the lower wire blocking transmission rod is provided with a pushing block, a stop block is fixedly arranged on the lower wire blocking rotating plate, and the front bottom wire connecting rod drives the lower wire blocking transmission rod to swing around the rod blocking shaft so as to enable the pushing block to be far away from the stop block or close to the stop block to push the stop block.

Preferably, the drive means comprises a bottom shear motor and a cam roller assembly; the cam roller component comprises a cam structure and a roller, the cam structure is fixedly connected to an output shaft of the bottom shear motor, a cam sliding groove is formed in the cam structure, the roller is connected in the cam sliding groove in a sliding mode, and the roller is connected to the front bobbin thread connecting rod so as to drive the front bobbin thread connecting rod to swing through the roller.

Preferably, the cam structure further comprises a sensor assembly, the outer surface of the cam structure comprises a detection surface, and the sensor assembly is used for detecting the change of the distance between the sensor assembly and the detection surface.

Preferably, still include the motor mounting panel, the casing of end scissors motor is fixed in the motor mounting panel, the casing of end scissors motor the cam structure is located respectively the both sides of motor mounting panel, the output shaft of end scissors motor passes shaft hole on the motor mounting panel and connects the cam structure.

The utility model provides a bottom shearing mechanism of a buttonholing machine, which comprises a needle plate mounting plate, a driving device, a lower shearing line assembly and a bottom line shearing transmission plate; the middle part of the bottom line shearing transmission plate is rotationally connected to the needle plate mounting plate through a transmission plate shaft, a bottom line guide device and a scissors control plate are fixedly arranged at two ends of the bottom line shearing transmission plate respectively, and the bottom line shearing transmission plate is connected to the driving device; the lower thread trimming component comprises a lower thread trimming fixed cutter fixedly connected above the needle plate mounting plate and a lower thread trimming movable cutter rotatably connected above the lower thread trimming fixed cutter through a positioning pin, and a driving pin is arranged on the lower thread trimming movable cutter; in the process that the driving device drives the shear bottom line driving plate to rotate around the driving plate shaft along the first direction, the shear control plate pushes the driving pin so that the lower shear line movable knife rotates around the positioning pin and is opened relative to the lower shear line fixed knife; in the process that the driving device drives the bottom line shearing driving plate to rotate around the driving plate shaft along the second direction, the bottom line thread guide moves towards the opening opened between the lower line shearing movable cutter and the lower line shearing fixed cutter, and the scissors control plate pushes the driving pin so that the lower line shearing movable cutter rotates around the positioning pin and is closed relative to the lower line shearing fixed cutter.

The driving device drives the bottom line shearing driving plate to swing, the opening and closing between the bottom line shearing movable cutter and the bottom line shearing fixed cutter can be realized, when the bottom line shearing movable cutter and the bottom line shearing fixed cutter are opened, the bottom line thread guide device is used for feeding threads between the bottom line shearing movable cutter and the bottom line shearing fixed cutter, the structure of the bottom line shearing movable cutter is simplified, the bottom line shearing fixed cutter is fixed on the needle plate mounting plate, the bottom line shearing movable cutter only needs to rotate around a shaft without other movements, the processing and the assembly of the bottom line shearing assembly are facilitated, and the line shearing is stable.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is an exploded view of the bottom shear mechanism of the buttonholing machine provided by the present invention;

fig. 2 is a lower thread trimming assembly of the bottom trimming mechanism of the buttonholing machine provided by the present invention;

fig. 3 is a front view of the bottom shearing mechanism of the buttonholing machine of the present invention;

fig. 4 is a bottom line connecting rod assembly of the bottom shearing mechanism of the buttonholing machine of the present invention.

Reference numerals:

a bottom line shearing transmission plate 1, a transmission plate shaft 1-1, a bottom line guide 2, a bottom line shearing assembly 3, a shear control plate 4, a bottom line blocking rotating plate 5, a stop block 5-1, a rotating plate shaft 5-2, a baffle elastic part 6, a bottom line blocking assembly 7, a bottom line blocking transmission rod 8, a push block 8-1, a bottom shear motor 9, a sensor assembly 10, a motor mounting plate 11, a cam roller assembly 12, a cam structure 12-1, a roller 12-2, a detection surface 12-3, a cam chute 12-4, a bottom line shearing connecting rod assembly 13, a needle plate mounting plate 14, a bottom line shearing fixed cutter 15, a bottom line shearing movable cutter 16, a bottom line shearing protective cutter 17, a fixed pin 18, a fixed pin 19, a clamp spring 20, a drive pin 21, a protective cutter gasket 22, a rear shaft position screw 23, a rear bottom line connecting rod 24, a rear connecting rod hole 24-1, an eccentric pin shaft 25, a first bottom line shearing connecting rod fixing sleeve 26, a front bottom line connecting rod 27, a front connecting rod hole 27-1, a nut 28, a second bottom line shearing connecting rod fixing sleeve 29 and a front shaft position screw 30.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The core of the utility model is to provide a mechanism is cut at buttonhole maker bottom, its processing and convenient assembling of trimming subassembly, the stability of trimming is better.

The first embodiment of the bottom shearing mechanism of the buttonholing machine provided by the present invention, please refer to fig. 1 to 4, which comprises a needle plate mounting plate 14, a driving device, a lower thread shearing assembly 3 and a bottom thread shearing transmission plate 1.

The middle part of the bottom shearing line transmission plate 1 is rotatably connected to the needle plate mounting plate 14 through a transmission plate shaft 1-1, and specifically, the needle plate mounting plate 14 is mounted on the machine shell through four straight screws. Both ends of the bottom line shearing transmission plate 1 are respectively and fixedly provided with a bottom line guide device 2 and a scissors control plate 4, specifically, the bottom line guide device 2 and the scissors control plate 4 are respectively installed on the bottom line shearing transmission plate 1 through a straight screw, and the bottom line shearing transmission plate 1 is connected to a driving device. The bottom line shearing transmission plate 1 is a U-shaped plate. The lower trimming assembly 3 can be opened and closed by the rotation of the trimming lower wire drive plate 1.

The lower thread trimming component 3 comprises a lower thread trimming fixed cutter 15 fixedly connected above the needle plate mounting plate 14 and a lower thread trimming movable cutter 16 rotatably connected above the lower thread trimming fixed cutter 15 through a positioning pin 19, and a driving pin 21 is arranged on the lower thread trimming movable cutter 16. Specifically, the positioning pin 19 penetrates through the lower movable trimming blade 16 and the lower fixed trimming blade 15 and is connected to the needle board mounting plate 14.

During the process that the driving device drives the shear bottom line driving plate 1 to rotate around the driving plate shaft 1-1 along the first direction, the shear control plate 4 can push the driving pin 21, so that the lower shear line movable knife 16 rotates around the positioning pin 19 and is opened relative to the lower shear line fixed knife 15.

In the process that the driving device drives the bobbin thread cutting driving plate 1 to rotate around the driving plate shaft 1-1 along the second direction, the bobbin thread guiding device 2 moves towards the opening opened between the lower thread cutting movable knife 16 and the lower thread cutting fixed knife 15, and the scissors control plate 4 can push the driving pin 21, so that the lower thread cutting movable knife 16 rotates around the positioning pin 19 and is closed relative to the lower thread cutting fixed knife 15.

The first direction is opposite to the second direction, for example, the first direction is clockwise, and the second direction is counterclockwise.

In this embodiment, the driving device drives the bottom line shearing driving plate 1 to swing, so as to realize the opening and closing between the lower line shearing movable knife 16 and the lower line shearing fixed knife 15, when the lower line shearing movable knife 16 and the lower line shearing fixed knife 15 are opened, the line is fed between the lower line shearing movable knife 16 and the lower line shearing fixed knife 15 through the bottom line thread guide 2, so that the structure of the lower line shearing movable knife 16 is simplified, the lower line shearing fixed knife 15 is fixed on the needle plate mounting plate 14, the lower line shearing movable knife 16 only needs to rotate around a shaft without other movements, the processing and the assembly of the lower line shearing assembly 3 are facilitated, and the line shearing is stable.

Further, the surface of the scissors control plate 4 facing the drive pin 21 comprises an opening push surface a and a closing push surface B, which may have an angle. The opening push surface a and the closing push surface B are respectively located on both sides of the drive pin 21.

In the process that the shear bottom line transmission plate 1 rotates along the first direction, the shear control plate 4 can push the driving pin 21 by opening the pushing surface A, and close the pushing surface B to be separated from the driving pin 21; during the rotation of the shear bottom wire transmission plate 1 along the second direction, the shear control plate 4 can push the drive pin 21 through the closing push surface B, and the opening push surface a is separated from the drive pin 21.

That is to say, the scissors control plate 4 pushes the driving pin 21 to move in two directions through two pushing surfaces respectively, the scissors control plate 4 is not directly connected with the driving pin 21, only when the corresponding pushing surface contacts the driving pin 21, the pushing force is further applied, and each pushing surface can apply unidirectional pushing force to the driving pin 21, so that the assembly is convenient.

Based on the arrangement, during the process that the driving device drives the scissors bottom wire transmission plate 1 to rotate around the transmission plate shaft 1-1 along the first direction or the second direction, the scissors control plate 4 may not always push the driving pin 21, and particularly, the arrangement of the initial position is also seen. For example, the lower movable trimming blade 16 and the lower stationary trimming blade 15 are at initial positions after being closed, when the lower movable trimming blade needs to be opened, the closing push surface B is gradually far away from the opening push surface a, the opening push surface a is gradually close to the drive pin 21, the drive pin 21 is not moved before the opening opposite surface a is not contacted with the drive pin 21, and the drive pin 21 is driven after the opening opposite surface a is contacted with the drive pin 21 and the bobbin thread drive plate 1 continues to move in the original direction after the opening opposite surface a is contacted with the drive pin 21. It can be seen that this pushing provides more freedom in the timing of the resetting of the scissor control plate 4.

Of course, in other embodiments, the scissors control board 4 may also be directly connected to the driving pin 21, and the driving pin 21 is driven to move along the corresponding direction synchronously by the movement of the scissors control board 4 in two directions.

Further, the lower thread trimming assembly 3 further comprises a lower thread trimming guard 17 arranged above the lower thread trimming moving knife 16, and the lower thread trimming guard 17 is fixedly connected with the needle plate mounting plate 14. Specifically, the positioning pin 19 also penetrates through the lower trimming guard 17, and the fixing pin 18 penetrates through the lower trimming guard 17 and the lower trimming stationary knife 15 and is connected to the needle plate mounting plate 14, so that the lower trimming guard 17 and the lower trimming stationary knife 15 are fixed to the needle plate mounting plate 14 through the positioning pin 19 and the fixing pin 18.

In the process that the driving device drives the bottom line shearing transmission plate 1 to rotate along the second direction, an opening between the lower line shearing guard 17 and the lower line shearing movable knife 16 is gradually reduced to clamp the line. By additionally arranging the lower trimming guard 17, the lower trimming component 3 has the trimming function and also has the trimming function, the lower trimming guard 17 and the lower trimming movable cutter 16 can be used for clamping the bottom line, and then the lower trimming fixed cutter 15 and the lower trimming movable cutter 16 are used for closing the trimming, so that the stability of trimming and trimming is better.

Further, the buttonholing machine bottom shear mechanism further comprises a lower thread guard assembly 7, and optionally, the lower thread guard assembly 7 is mounted on the casing by two hexagon socket head cap screws. The drive means is also used to drive the lower thread stop assembly 7 to move over the needle plate mounting plate 14. The lower thread stop assembly 7 can fix the position of the bobbin and prevent the rotation of the rotating shuttle bobbin in the thread cutting process.

Further, the buttonholing machine bottom shear mechanism also comprises a lower stop line rotating plate 5. The middle part of the lower wire blocking rotating plate 5 is rotatably connected to the rotating plate shaft 5-2, one end of the lower wire blocking rotating plate 5 is connected to the lower wire blocking device assembly 7, and the lower wire blocking rotating plate 5 is connected with a baffle elastic piece 6, specifically a spring or an elastic sheet.

The driving device is connected with a lower wire blocking transmission rod 8, so that the lower wire blocking transmission rod 8 is driven by the driving device to be close to and push the lower wire blocking rotating plate 5 to swing against the elastic force of the baffle elastic piece 6, or to be far away from the lower wire blocking rotating plate 5, so that the lower wire blocking rotating plate 5 swings reversely under the elastic force of the baffle elastic piece 6 and pushes the lower wire blocking assembly 7. Through the cooperation of baffle elastic component 6 and lower wire blocking transfer line 8, can effectively drive the motion of wire blocking ware subassembly 7 down.

Further, the buttonholing machine bottom shear mechanism further comprises a shear bottom line connecting rod assembly 13. As shown in FIG. 4, the shear bottom wire link assembly 13 includes a front bottom wire link 27 and a rear bottom wire link 24. The front bobbin thread connecting rod 27 is rotatably connected to the front rod rotating shaft, and the driving device is in transmission connection with the front bobbin thread connecting rod 27 to drive the front bobbin thread connecting rod 27 to swing around the front rod rotating shaft, and optionally, the front rod rotating shaft comprises a nut 28, a second bobbin thread connecting rod fixing sleeve 29 and a front shaft position screw 30 which are in fit connection. The rear bottom line connecting rod 24 is connected with the bottom line shearing transmission plate 1 and is fixedly connected with the rear shaft position screw 23.

The front bobbin thread connecting rod 27 is provided with a front connecting rod hole 27-1, the rear bobbin thread connecting rod 24 is provided with a rear connecting rod hole 24-1, the front connecting rod hole 27-1 is fixedly connected with the rear connecting rod hole 24-1 through a detachable eccentric pin shaft 25, specifically, the eccentric pin shaft 25 comprises two eccentrically arranged parts, one part of the eccentrically arranged parts is concentrically connected with the rear connecting rod hole 24-1, the other part of the eccentrically arranged parts is concentrically connected with the front connecting rod hole 27-1, and the relative position relation between the front bobbin thread connecting rod 27 and the rear bobbin thread connecting rod 24 can be adjusted by rotating the eccentric pin shaft 25, so that the installation angles of the front bobbin thread connecting rod 27 and the rear bobbin thread connecting rod 24 can be adjusted conveniently, and errors caused by parts and installation can be counteracted. Optionally, a first bobbin thread link retainer housing 26 is concentrically mounted to the front link aperture 27-1, and the cam pin 25 is attached to the first bobbin thread link retainer housing 26.

Further, the lower wire blocking transmission rod 8 is rotatably connected to the rod shaft, and referring to fig. 3, one end of the lower wire blocking transmission rod 8 is connected to the front bobbin thread connecting rod 27, specifically, can be connected to a connecting pin on the front bobbin thread connecting rod 27 through a waist hole on the lower wire blocking transmission rod 8, and the other end is provided with a pushing block 8-1. The lower stop line rotating plate 5 is fixedly provided with a stop block 5-1.

The front bobbin thread connecting rod 27 drives the lower thread blocking transmission rod 8 to swing around the thread blocking rod shaft, so that the pushing block 8-1 is far away from the stop block 5-1, the baffle elastic piece 6 is reset, the lower thread blocking rotating plate 5 is driven to swing through elasticity, or the pushing block 8-1 is close to push the stop block 5-1, and the lower thread blocking rotating plate 5 reversely swings against the elasticity of the baffle elastic piece 6. The matching structure between the lower wire blocking transmission rod 8 and the lower wire blocking rotating plate 5 is simple, and the processing is convenient. Of course, in other embodiments, the lower wire drive link 8 can also be directly connected to the lower wire pivoting plate 5.

Further, the driving means comprises a bottom shear motor 9 and a cam roller assembly 12. The cam roller assembly 12 comprises a cam structure 12-1 and a roller 12-2, the cam structure 12-1 is fixedly connected to an output shaft of the bottom shear motor 9, a cam chute 12-4 is arranged on the cam structure 12-1, the roller 12-2 is slidably connected in the cam chute 12-4, and the roller 12-2 is connected to the front bobbin thread connecting rod 27 so as to drive the front bobbin thread connecting rod 27 to swing through the roller 12-2. The cam roller assembly 12 transmits motion to the bottom line shearing transmission plate 1 and the lower stop line rotating plate 5 through the bottom line shearing connecting rod assembly 13, and stable motion of the front bottom line connecting rod 27 can be ensured based on the limit of the cam chute 12-4. Of course, in other embodiments, the bottom shear motor 9 may be directly connected to the front bobbin thread link 27.

Further, the bottom shearing mechanism of the buttonholing machine further comprises a sensor assembly 10, the outer surface of the cam structure 12-1 comprises a detection surface 12-3, and the sensor assembly 10 is used for detecting the change of the distance between the sensor assembly and the detection surface 12-3, so that the rotating position of the bottom shearing motor 9 can be sensed.

Further, the bottom shearing mechanism of the buttonholing machine further comprises a motor mounting plate 11, and the motor mounting plate 11 is mounted on the machine shell and serves as an important bearing part of the whole bottom shearing mechanism. The shell of the bottom shear motor 9 is fixed on the motor mounting plate 11, the shell of the bottom shear motor 9 and the cam structure 12-1 are respectively positioned at two sides of the motor mounting plate 11, and the output shaft of the bottom shear motor 9 penetrates through the shaft hole on the motor mounting plate 11 and is connected with the cam structure 12-1. The sensor assembly 10 is secured by two socket head cap screws or other attachment structure. The front-lever pivot is provided on the motor-mounting plate 11 so that the front bobbin-thread link 27 is connected to the motor-mounting plate 11 through the front-lever pivot. With the help of the motor mounting plate 11, the assembly of different parts in the driving device can be carried out based on the structure of the motor mounting plate 11, and the operation is convenient.

The bottom shearing mechanism of the buttonholing machine in the embodiment has the working principle as follows:

firstly, as shown in fig. 3, the whole bottom shearing mechanism is in a closed wire clamping state and is set to be in an initial state.

After sewing is started, an output shaft of the bottom shear motor 9 rotates to drive the cam structure 12-1 to rotate through a settable sewing distance, and the roller 12-2 transmits the motion to the bottom shear line transmission plate 1 and the lower stop line transmission rod 8 through the bottom shear line connecting rod assembly 13. The bottom line shearing transmission plate 1 rotates clockwise to drive the scissors control plate 4 to collide with the driving pin 21 on the lower line shearing assembly 3, so that the lower line shearing movable knife 16 is pushed to be opened relative to the needle plate mounting plate 14 and the lower line shearing fixed knife 15, and the functions of opening and loosening the scissors are achieved. The lower thread trimming component 3 is opened by a certain angle, the bottom shearing motor 9 rotates anticlockwise, the bottom shearing transmission plate 1 returns to the initial state, and the lower thread trimming component 3 is in the opening state at the moment.

And thirdly, after sewing is finished, preparing for cutting the bottom thread, and driving the bottom thread cutting transmission plate 1 and the lower thread blocking transmission rod 8 to rotate by the bottom thread cutting motor 9 through the cam roller assembly 12 and the bottom thread cutting connecting rod assembly 13. The lower thread retaining transmission rod 8 rotates clockwise, the lower thread retaining device assembly 7 rotates under the tension of the retaining plate elastic piece 6, the position of the bobbin can be fixed, and the rotation of the rotating bobbin in the thread trimming process is prevented. The bottom line shearing transmission plate 1 rotates anticlockwise to drive the bottom line guide device 2 to bring the bottom line into an opening of the lower line shearing assembly 3, the bottom line shearing transmission plate 1 continues to rotate and hits the driving pin 21 to push the lower line shearing movable knife 16 to rotate and close relative to the needle plate mounting plate 14 and the lower line shearing fixed knife 15, the bottom line can be clamped between the lower line shearing movable knife 16 and the lower line shearing protective knife 17, and the bottom line can be sheared between the lower line shearing movable knife 16 and the lower line shearing fixed knife 15. After the functions of clamping and trimming are realized, the bottom shearing motor 9 rotates reversely, the bottom shearing transmission plate 1 returns to the initial state again, and the lower trimming component 3 is in a closed wire clamping state at the moment to wait for next sewing; and the lower wire blocking transmission rod 8 also rotates reversely at the same time, and the lower wire blocking assembly 7 is driven to return to the initial state through the lower wire blocking rotating plate 5.

In the bottom shearing mechanism of the buttonholing machine in the embodiment, the opening and closing of the lower thread shearing assembly 3 are not directly influenced any more by the installation position of the bottom shearing motor 9, the opening and closing conditions of the lower thread shearing assembly 3 are adjusted mainly by the position adjustment of the bottom thread guide 2 on the bottom thread shearing transmission plate 1 and the scissors control plate 4, the influence of the installation position of the motor and the error of parts on the whole mechanism and the thread shearing condition is reduced, and the debugging is simplified; the whole position of the lower thread trimming component 3 is fixed, threads are swept into a scissor mouth to realize thread clamping and trimming, so that the problem of instability of thread trimming and thread clamping is solved, and the thread clamping stability after the bottom threads are trimmed is improved.

In addition, the bottom shearing mechanism of the buttonholing machine is applied to the buttonholing machine, and can be specifically a 1790 buttonholing machine, and more specifically a 1790J high-speed electronic flat buttonholing machine.

It will be understood that when an element is referred to as being "secured" to another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In the description of the present invention, the terms "plurality", and "plural" mean two or more unless otherwise specified.

The terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The bottom shearing mechanism of the buttonholing machine provided by the utility model is described in detail. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the scope of the appended claims.

Claims (10)

1. A buttonholing machine bottom shear mechanism is characterized by comprising a needle plate mounting plate (14), a driving device, a lower thread shearing assembly (3) and a bottom thread shearing transmission plate (1);

the middle part of the bottom line shearing transmission plate (1) is rotatably connected to the needle plate mounting plate (14) through a transmission plate shaft (1-1), two ends of the bottom line shearing transmission plate (1) are respectively and fixedly provided with a bottom line guide device (2) and a shear control plate (4), and the bottom line shearing transmission plate (1) is connected to the driving device;

the lower thread trimming component (3) comprises a lower thread trimming fixed cutter (15) fixedly connected above the needle plate mounting plate (14) and a lower thread trimming movable cutter (16) rotatably connected above the lower thread trimming fixed cutter (15) through a positioning pin (19), and a driving pin (21) is arranged on the lower thread trimming movable cutter (16);

in the process that the driving device drives the bottom line shearing transmission plate (1) to rotate around the transmission plate shaft (1-1) along a first direction, the scissors control plate (4) can push the driving pin (21) so that the lower line shearing movable knife (16) rotates around the positioning pin (19) and is opened relative to the lower line shearing fixed knife (15);

the driving device drives the bobbin thread cutting driving plate (1) to wind the driving plate shaft (1-1) along the second direction rotating process, the bobbin thread guide (2) faces the lower bobbin thread cutting movable knife (16) and the opening opened between the lower bobbin thread cutting fixed knives (15), and the scissors control plate (4) can push the driving pin (21) so that the lower bobbin thread cutting movable knife (16) winds the positioning pin (19) to rotate and relative to the lower bobbin thread cutting fixed knives (15) to be closed.

2. The buttonholing machine bottom shear mechanism according to claim 1, characterized in that the surface of the shear control plate (4) facing the drive pin (21) comprises an opening push face (a) and a closing push face (B), which are located on either side of the drive pin (21);

during the rotation of the shear bottom line transmission plate (1) along the first direction, the shear control plate (4) can push the driving pin (21) through the opening push surface (A), and the closing push surface (B) is separated from the driving pin (21); the scissors bottom line transmission plate (1) is arranged along the second direction rotating process, the scissors control plate (4) can push the driving pin (21) through the closed pushing surface (B), and the open pushing surface (A) is separated from the driving pin (21).

3. The buttonholing machine bottom shear mechanism according to claim 1, wherein the lower thread trimming assembly (3) further comprises a lower thread trimming guard (17) arranged above the lower thread trimming moving knife (16), and the lower thread trimming guard (17) is fixedly connected with the needle plate mounting plate (14); in the process that the driving device drives the bottom line shearing transmission plate (1) to rotate along the second direction, an opening between the lower line shearing movable knife (16) and the lower line shearing protective knife (17) is gradually reduced to clamp lines.

4. The buttonholing machine bottom shear mechanism according to any one of claims 1 to 3, further comprising a lower thread stop assembly (7), the drive means being further for driving the lower thread stop assembly (7) to move over the needle plate mounting plate (14).

5. The buttonholing machine bottom shear mechanism according to claim 4, further comprising a lower thread stop rotating plate (5), wherein the middle part of the lower thread stop rotating plate (5) is rotatably connected to a rotating plate shaft (5-2), one end of the lower thread stop rotating plate (5) is connected to the lower thread stop assembly (7), and the lower thread stop rotating plate (5) is connected to a stop elastic member (6);

drive arrangement is connected with down gear line transfer line (8), in order to pass through the drive arrangement drive down gear line transfer line (8) are close to and promote down gear line rotor plate (5) overcome the elasticity swing of baffle elastic component (6), perhaps keep away from down gear line rotor plate (5), make gear line rotor plate (5) are in reverse swing under the elasticity of baffle elastic component (6) and promote down gear line ware subassembly (7).

6. The buttonholing machine bottom shear mechanism according to claim 5, further comprising a bottom line shearing connecting rod assembly (13), wherein the bottom line shearing connecting rod assembly (13) comprises a front bottom line connecting rod (27) and a rear bottom line connecting rod (24), the front bottom line connecting rod (27) is rotatably connected to a front rod rotating shaft, the driving device is in transmission connection with the front bottom line connecting rod (27) to drive the front bottom line connecting rod (27) to swing around the front rod rotating shaft, and the rear bottom line connecting rod (24) is connected with the bottom line shearing driving plate (1); the front bobbin thread connecting rod (27) is provided with a front connecting rod hole (27-1), the rear bobbin thread connecting rod (24) is provided with a rear connecting rod hole (24-1), and the front connecting rod hole (27-1) is fixedly connected with the rear connecting rod hole (24-1) through a detachable eccentric pin shaft (25).

7. The buttonholing machine bottom shear mechanism according to claim 6, wherein the lower wire blocking transmission rod (8) is rotatably connected to a rod shaft, one end of the lower wire blocking transmission rod (8) is connected to the front bottom wire connecting rod (27), the other end of the lower wire blocking transmission rod is provided with a pushing block (8-1), a block (5-1) is fixedly arranged on the lower wire blocking rotating plate (5), and the front bottom wire connecting rod (27) drives the lower wire blocking transmission rod (8) to swing around the rod shaft so as to enable the pushing block (8-1) to move away from or close to the block (5-1) to push the block (5-1).

8. The buttonholing machine bottom shear mechanism according to claim 6, wherein said drive means comprise a bottom shear motor (9) and a cam roller assembly (12); the cam roller assembly (12) comprises a cam structure (12-1) and a roller (12-2), the cam structure (12-1) is fixedly connected to an output shaft of the bottom shear motor (9), a cam sliding groove (12-4) is formed in the cam structure (12-1), the roller (12-2) is connected in the cam sliding groove (12-4) in a sliding mode, and the roller (12-2) is connected to the front bottom line connecting rod (27) so that the roller (12-2) can drive the front bottom line connecting rod (27) to swing.

9. The buttonholing machine bottom shear mechanism according to claim 8, further comprising a sensor assembly (10), the outer surface of the cam structure (12-1) comprising a detection surface (12-3), the sensor assembly (10) being adapted to detect a change in its spacing from the detection surface (12-3).

10. The bottom shear mechanism of a buttonholing machine according to claim 8, further comprising a motor mounting plate (11), wherein the housing of the bottom shear motor (9) is fixed on the motor mounting plate (11), the housing of the bottom shear motor (9) and the cam structure (12-1) are respectively located at two sides of the motor mounting plate (11), and the output shaft of the bottom shear motor (9) passes through the shaft hole on the motor mounting plate (11) and is connected with the cam structure (12-1).

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