CN216193262U

CN216193262U - Electromagnet-driven thread trimming mechanism

Info

Publication number: CN216193262U
Application number: CN202122643946.8U
Authority: CN
Inventors: 符志诚; 赵林蔚; 蔡祖元
Original assignee: Jack Technology Co Ltd
Current assignee: Jack Technology Co Ltd
Priority date: 2021-10-29
Filing date: 2021-10-29
Publication date: 2022-04-05
Anticipated expiration: 2031-10-29

Abstract

The utility model provides an electromagnet-driven thread trimming mechanism, and belongs to the technical field of sewing equipment. The thread trimming mechanism comprises an electromagnet assembly and a cutter assembly, wherein the cutter assembly comprises a cutter holder, a cutter shaft capable of rotating is arranged on the cutter holder, the electromagnet assembly is provided with a core rod capable of moving up and down, a thread trimming driving piece is fixed on the core rod, a connecting rod is hinged on the thread trimming driving piece, a thread trimming crank is hinged on one end of the connecting rod, and the other end of the thread trimming crank is fixed at one end of the cutter shaft. The thread trimming mechanism reduces the requirement on the matching precision of the electromagnet and the thread trimming crank, reduces the processing difficulty, improves the working efficiency and reduces the noise during thread trimming.

Description

Electromagnet-driven thread trimming mechanism

Technical Field

The utility model belongs to the technical field of sewing equipment, and relates to a thread cutting mechanism driven by an electromagnet.

Background

The existing wire shearing structure is generally divided into three types, namely a motor-driven wire shearing structure, an electromagnet-driven wire shearing structure and an air cylinder-driven wire shearing structure, wherein the motor-driven wire shearing structure has the advantages of adjustable wire shearing angle, adjustable wire shearing time control, low sound and the like, but the electric control complexity is high, the structure is various, the installation difficulty is high, and the cost is high; the wire cutting structure driven by the air cylinder has little difference with the wire cutting structure driven by the electromagnet, and is mainly influenced by pneumatic equipment such as the air cylinder and the like, so that the cost is high and the noise is large; the electromagnet-driven trimming mechanism is low in cost and simple to control, the driven trimming structure has the advantages of simplicity in installation, low cost and the like, but the requirements on the guide matching precision of the core rod inside the electromagnet and the electromagnet inner shell and the precision of the connecting piece are high, and the noise is large.

Chinese patent document with application number 202020291454.X discloses a hemming machine thread trimmer mechanism, including the knife rest, the knife rest is provided with vertical board and two-section hole, the tip of vertical board is provided with the striker plate, run through in the two-section hole and be provided with the pivot, fixed connection is provided with electromagnet assembly on the extension end of pivot, the other end fixed connection of pivot sets up and moves the sword, with moving the fixed sword that is provided with on the knife rest that the sword blade is relative, move the sword and do circular motion and stationary knife meshing through the rotatory drive of pivot.

In the thread trimming mechanism, one end of a core rod of the electromagnet is provided with an elongated slot, a shaft hole at one end of a connecting rod is fixedly provided with a cutter pin, the cutter pin is matched with the elongated slot on the core rod, the other end of the connecting rod is fixedly connected with a cutter shaft in the cutter assembly, and the extension and retraction of the core rod of the electromagnet drives the connecting rod to rotate so as to realize thread trimming. The structure has the defects that the structure is influenced by the precision of the long groove and the installation precision, a certain moving space is reserved for the core rod of the electromagnet during installation, otherwise, the electromagnet is easy to block, and the problem of high noise during trimming is caused.

Disclosure of Invention

Aiming at the problems in the prior art, the utility model provides an electromagnet-driven thread trimming mechanism, which aims to solve the technical problems that: how to reduce the guide fit precision requirement between the inner core rod of the electromagnet and the inner shell of the electromagnet and the noise of the whole trimming connecting structure.

The purpose of the utility model can be realized by the following technical scheme:

the utility model provides an electro-magnet driven trimming mechanism, trimming mechanism includes electro-magnet subassembly and cutter unit spare, cutter unit spare includes the blade holder, be provided with on the blade holder and can pivoted arbor, electro-magnet subassembly has the plug that can reciprocate, a serial communication port, be fixed with the trimming driving piece on the plug, it has the connecting rod to articulate on the trimming driving piece, it has the trimming crank to articulate on the tip of connecting rod, the trimming crank's the other end is fixed the one end of arbor.

The working principle is as follows: in the thread trimming mechanism, an electromagnet assembly and a cutter assembly are both arranged on a shell (not shown in the figure) of the sewing machine, and the cutter assembly comprises a cutter holder and a cutter shaft. A wire cutting driving piece is fixed on a core rod in the electromagnet assembly and is hinged with one end of a connecting rod, the other end of the connecting rod is hinged with a wire cutting crank, and the wire cutting crank is fixed with a cutter shaft. Under the drive of the electromagnet, the thread cutting driving piece moves up and down along with the core rod, the thread cutting driving piece drives the connecting rod to swing, the connecting rod drives the thread cutting crank to swing, the cutter shaft rotates along with the thread cutting crank, and the movable cutter is matched with the fixed cutter after rotating to realize thread cutting.

Compared with a sliding type structure in the prior art that a cutter pin or a sliding pin is matched with the core rod through an elongated slot, the thread cutting mechanism has the advantages that the requirement on the matching precision of an electromagnet and the thread cutting crank is lowered, the processing difficulty is lowered, the working efficiency is improved, and meanwhile, the noise during thread cutting is reduced.

In the electromagnet-driven thread trimming mechanism, the electromagnet assembly is provided with the mounting bracket, the mounting bracket is located at the extending end of the core rod, the mounting bracket is provided with a first boss, the first boss is provided with a first guide hole, and the core rod is slidably connected in the first guide hole.

The guide hole on the first boss plays a good guiding role for the core rod, so that the core rod can slide up and down more smoothly and stably, and the thread shearing action is better completed.

In the electromagnet-driven thread trimming mechanism, the mounting bracket is provided with a second boss, the second boss is provided with a second guide hole, the second guide hole and the second guide hole are coaxially arranged, and the core rod is slidably connected to the first guide hole and the second guide hole.

The guide hole I and the guide hole II on the boss I and the boss II form a double-guide structure, the two guide structures jointly play a good role in guiding the core rod, so that the core rod can slide up and down more smoothly and stably, a supporting guide part does not need to be arranged inside the electromagnet to be matched with the core rod, and the thread shearing action is well completed under the condition of simplifying the structure.

In the electromagnet-driven trimming mechanism, the mounting bracket is provided with a chute, the chute extends along the axial direction of the core rod, the trimming driving piece is fixed on the core rod through a pin shaft, and the pin shaft is connected in the chute in a sliding manner.

The trimming driving piece and the core rod are fixed through the pin shaft, the pin shaft penetrates through the sliding groove in the mounting support, the pin shaft and the sliding groove form a sliding guide structure, the structure can limit circumferential rotation of the core rod, the trimming driving piece is prevented from swinging left and right in the up-and-down moving process, and the stability of the trimming driving piece in moving is improved.

In the above electromagnet-driven thread trimming mechanism, the outer end of the thread trimming driving piece is hinged to the connecting rod through a hinge pin, one end of the hinge pin is provided with a pin cap, the other end of the hinge pin penetrates through the outer end of the thread trimming driving piece and the connecting rod, and the other end of the hinge pin is in threaded connection with a nut.

In this structure, the pin cap of nut and hinge pin carries on spacingly to trimming driving piece and connecting rod jointly, makes the two can only the rotation each other, can not follow the axial displacement of hinge pin, makes the difficult emergence of pin joint of the two change, and the stability of the two connection of fine increase makes trimming driving piece and connecting rod difficult not hard up.

In foretell electromagnet drive's trimming mechanism, the last strip groove, mounting hole one and the mounting hole two of having seted up of trimming crank, the one end of arbor is pegged graft and is fixed on the mounting hole one, the connecting rod with trimming crank is articulated mutually through the round pin axle, the one end of round pin axle is pegged graft and is fixed on the mounting hole two, the strip groove with mounting hole one communicates with mounting hole two, the strip inslot is provided with the flexible piece, the threaded connection has the bolt on the trimming crank, the bolt passes two cell walls in strip groove.

When arbor and round pin axle are pegged graft respectively and are fixed on mounting hole one and mounting hole two, the bolt of screwing makes two relative cell walls in bar groove be close to mutually, and two cell walls extrude the flexible piece, and the flexible piece produces little deformation, and the respective aperture of mounting hole one and mounting hole two also diminishes correspondingly simultaneously to carry out the clamp more firm to arbor and round pin axle, and the flexible piece receives extrusion deformation to produce reaction force, makes mounting hole one and mounting hole two again can not lead to the fact the harm to arbor and the excessive clamp of round pin axle.

In the above electromagnet-driven thread trimming mechanism, the flexible member is a rubber gasket, a leather gasket, or a rubber asbestos gasket.

The flexible member may be a rubber gasket, a leather gasket, a rubber asbestos gasket, or the like which is capable of generating a small deformation when being pressed. When the flexible piece is the rubber gasket, the rubber gasket is extruded to generate elastic deformation, and the rubber gasket, the bolt, the first mounting hole and the first mounting hole elastically compress the cutter shaft and the pin shaft, so that the mounting firmness is further improved.

In the thread trimming mechanism driven by the electromagnet, the cutter assembly further comprises a fixed cutter and a movable cutter, the fixed cutter is fixed on the cutter seat, the movable cutter is fixed at the other end of the cutter shaft, and the fixed cutter and the movable cutter can be meshed and separated.

Under the drive of the electromagnet, the cutter shaft rotates along with the thread cutting crank, the movable cutter is meshed with or separated from the fixed cutter after rotating, and thread cutting is realized when the movable cutter is meshed with the fixed cutter.

Compared with the prior art, the utility model has the following advantages:

1. compared with a sliding type structure in the prior art that a cutter pin or a sliding pin is matched with the core rod through an elongated slot, the thread cutting mechanism has the advantages that the requirement on the matching precision of an electromagnet and the thread cutting crank is lowered, the processing difficulty is lowered, the working efficiency is improved, and meanwhile, the noise during thread cutting is reduced.

2. The wire cutting mechanism enables the core rod to move smoothly and stably through the matching of the first boss and the second boss on the mounting support and the core rod, and reduces the matching requirement of the internal guide piece of the electromagnet and the core rod.

Drawings

FIG. 1 is a schematic structural view of the present thread trimming mechanism;

FIG. 2 is a schematic view of the thread trimming mechanism from another perspective;

FIG. 3 is a schematic structural view of a mounting bracket;

fig. 4 is a schematic structural view of the trimming crank.

In the figure, 1 electromagnet assembly; 2, a cutter component; 3, a tool apron; 4, fixing a cutter; 5, a cutter shaft; 6, a core rod; 7, a trimming driving piece; 8 connecting rods; 9 a trimming crank; 10 moving the knife; 11 mounting a bracket; 12, a first boss; 13, a first guide hole; 14, a second boss; 15, a second guide hole; 16 chutes; 17, a pin shaft; 18 a hinge pin; 19 a pin cap; 20 strip-shaped grooves; 21, mounting a first hole; 22, a second mounting hole; 23, bolts; 24 nuts.

Detailed Description

The following are specific embodiments of the present invention, and the technical solutions of the present invention will be further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1 and 2, the thread trimming mechanism includes an electromagnet assembly 1 and a cutter assembly 2, the cutter assembly 2 includes a cutter holder 3, a stationary knife 4 is fixed on the cutter holder 3, a rotatable knife shaft 5 is arranged on the cutter holder 3, the electromagnet assembly 1 has a mandrel 6 capable of moving up and down, a thread trimming driving member 7 is fixed on the mandrel 6, a connecting rod 8 is hinged on the thread trimming driving member 7, a thread trimming crank 9 is hinged on one end of the connecting rod 8, one end of the knife shaft 5 is fixed on the thread trimming crank 9, and a movable knife 10 is installed at the other end of the knife shaft 5.

In the thread trimming mechanism, the electromagnet assembly 1 and the cutter assembly 2 are both arranged on a shell (not shown in the figure) of the sewing machine, the cutter assembly 2 comprises a cutter shaft 5, the cutter shaft 5 is provided with the movable cutter 10, and the movable cutter 10 is meshed with the fixed cutter 4 to realize thread trimming. A wire cutting driving piece 7 is fixed on a core rod 6 in the electromagnet assembly 1, the wire cutting driving piece 7 is hinged with one end of a connecting rod 8, the other end of the connecting rod 8 is hinged with a wire cutting crank 9, and the wire cutting crank 9 is fixed with the cutter shaft 5. Under the drive of the electromagnet, the trimming driving piece 7 moves up and down along with the core rod 6, the trimming driving piece 7 drives the connecting rod 8 to swing, the connecting rod 8 drives the trimming crank 9 to swing, the cutter shaft 5 rotates along with the trimming crank 9, and the movable cutter 10 is matched with the fixed cutter 4 after rotating to realize trimming.

As shown in fig. 1 and 3, in the present embodiment, the electromagnet assembly 1 is provided with a mounting bracket 11, the mounting bracket 11 is located at the protruding end of the core rod 6, the mounting bracket 11 is provided with a first boss 12, the first boss 12 is provided with a first guide hole 13, and the core rod 6 is slidably connected in the first guide hole 13.

The guide hole I13 on the boss I12 plays a good role in guiding the core rod 6, so that the core rod 6 can slide up and down more smoothly and stably, and the thread shearing action is better completed.

As shown in fig. 1 and 3, in the present embodiment, the second boss 14 is provided on the mounting bracket 11, the second boss 14 is provided with the second guide hole 15, the second guide hole 15 is coaxially arranged with the first guide hole 13, and the core rod 6 is slidably connected to the first guide hole 13 and the second guide hole 15.

The first guide hole 13 and the second guide hole 15 on the first boss 12 and the second boss 14 form a double-guide structure, the two guide structures have good guide effects on the core rod 6 together, so that the core rod 6 can slide up and down more smoothly and stably, a supporting guide part does not need to be arranged inside the electromagnet to be matched with the core rod 6, and the wire shearing action is well completed under the condition of simplifying the structure.

As shown in fig. 1 to 3, in this embodiment, a sliding slot 16 is formed in the mounting bracket 11, the sliding slot 16 extends along the axial direction of the core rod 6, the trimming driving member 7 is fixed on the core rod 6 by a pin 17, and the pin 17 is slidably connected in the sliding slot 16.

The trimming driving piece 7 and the core rod 6 are fixed through a pin shaft 17, the pin shaft 17 penetrates through a sliding groove 16 in the mounting support 11, the pin shaft 17 and the sliding groove 16 form a sliding guide structure, the structure can limit circumferential rotation of the core rod 6, the trimming driving piece 7 is prevented from swinging left and right in the up-and-down moving process, and stability of the trimming driving piece 7 during moving is improved.

As shown in fig. 1 and 2, in the present embodiment, the outer end portion of the trimming driver 7 is hinged to the link 8 by a hinge pin 18, one end of the hinge pin 18 has a pin cap 19, the other end of the hinge pin 18 passes through the outer end portion of the trimming driver 7 and the link 8, the other end of the hinge pin 18 is threadedly connected to a nut 24, the pin cap 19 abuts against one side of the link 8, and the nut 24 abuts against one side of the outer end portion of the trimming driver 7.

In this structure, the pin cap 19 of nut 24 and hinge pin 18 is spacing to trimming driving piece 7 and connecting rod 8 jointly, makes the two can only rotate each other, can not follow the axial displacement of hinge pin 18, makes the difficult emergence of the pin joint of the two change, and the stability of the two connection of fine increase makes trimming driving piece 7 and connecting rod 8 difficult not hard up.

As shown in fig. 1 and 4, in this embodiment, a strip-shaped groove 20, a first mounting hole 21 and a second mounting hole 22 are formed in the wire cutting crank 9, one end of the cutter shaft 5 is inserted and fixed on the first mounting hole 21, the connecting rod 8 is hinged to the wire cutting crank 9 through a pin shaft 17, one end of the pin shaft 17 is inserted and fixed on the second mounting hole 22, the strip-shaped groove 20 is communicated with the first mounting hole 21 and the second mounting hole 22, a flexible member is arranged in the strip-shaped groove 20, a bolt 23 is connected to the wire cutting crank 9 through a thread, and the bolt 23 penetrates through two groove walls of the strip-shaped groove 20.

When the cutter shaft 5 and the pin shaft 17 are respectively inserted and fixed on the first mounting hole 21 and the second mounting hole 22, the bolt 23 is screwed, two opposite groove walls of the strip-shaped groove 20 are close to each other, the two groove walls extrude the flexible part, the flexible part generates tiny deformation, and the respective apertures of the first mounting hole 21 and the second mounting hole 22 are correspondingly reduced, so that the cutter shaft 5 and the pin shaft 17 are clamped more stably, the flexible part generates reaction force by extrusion deformation, and the first mounting hole 21 and the second mounting hole 22 cannot excessively clamp the cutter shaft 5 and the pin shaft 17 to cause damage.

The flexible member may be a rubber gasket, a leather gasket, a rubber asbestos gasket, or the like which is capable of generating a small deformation when being pressed. When the flexible piece is a rubber gasket, the rubber gasket is extruded to generate elastic deformation, and the rubber gasket, the bolt 23, the first mounting hole 21 and the second mounting hole 22 elastically compress the cutter shaft 5 and the pin shaft 17, so that the mounting firmness is further improved.

The specific embodiments described herein are merely illustrative of the spirit of the utility model. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the utility model as defined in the appended claims.

Claims

1. The utility model provides an electro-magnet driven trimming mechanism, trimming mechanism includes electro-magnet subassembly (1) and cutter unit spare (2), cutter unit spare (2) include blade holder (3), be provided with on blade holder (3) can pivoted arbor (5), electro-magnet subassembly (1) has plug (6) that can reciprocate, a serial communication port, be fixed with trimming driving piece (7) on plug (6), it has connecting rod (8) to articulate on trimming driving piece (7), it has trimming crank (9) to articulate on the tip of connecting rod (8), the other end of trimming crank (9) is fixed the one end of arbor (5).

2. An electromagnet driven thread trimming mechanism according to claim 1, wherein the electromagnet assembly (1) is provided with a mounting bracket (11), the mounting bracket (11) is positioned at the extending end of the core rod (6), the mounting bracket (11) is provided with a first boss (12), the first boss (12) is provided with a first guide hole (13), and the core rod (6) is slidably connected in the first guide hole (13).

3. An electromagnet driven thread trimming mechanism according to claim 2, wherein the mounting bracket (11) is provided with a second boss (14), the second boss (14) is provided with a second guide hole (15), the second guide hole (15) is arranged coaxially with the first guide hole (13), and the core rod (6) is slidably connected to the first guide hole (13) and the second guide hole (15).

4. The electromagnet-driven trimming mechanism according to claim 2, wherein the mounting bracket (11) is provided with a sliding groove (16), the sliding groove (16) extends along the axial direction of the core rod (6), the trimming driving member (7) is fixed on the core rod (6) through a pin shaft (17), and the pin shaft (17) is slidably connected in the sliding groove (16).

5. An electromagnet driven trimming mechanism according to claim 1, characterized in that the outer end of the trimming drive member (7) is hinged to the connecting rod (8) by means of a hinge pin (18), one end of the hinge pin (18) having a pin cap (19), the other end of the hinge pin (18) passing through the outer end of the trimming drive member (7) and the connecting rod (8), the other end of the hinge pin (18) being threadedly connected to a nut (24).

6. The electromagnet-driven wire cutting mechanism according to any one of claims 1 to 5, wherein a strip-shaped groove (20), a first mounting hole (21) and a second mounting hole (22) are formed in the wire cutting crank (9), one end of the cutter shaft (5) is inserted and fixed in the first mounting hole (21), the connecting rod (8) and the wire cutting crank (9) are hinged to each other through a pin shaft (17), one end of the pin shaft (17) is inserted and fixed in the second mounting hole (22), the strip-shaped groove (20) is communicated with the first mounting hole (21) and the second mounting hole (22), a flexible part is arranged in the strip-shaped groove (20), a bolt (23) is connected to the wire cutting crank (9) in a threaded manner, and the bolt (23) penetrates through two groove walls of the strip-shaped groove (20).

7. An electromagnet driven thread trimming mechanism according to claim 6, wherein the flexible member is a rubber or leather or rubber asbestos gasket.

8. The electromagnet-driven thread trimming mechanism according to claim 6, wherein the cutter assembly (2) further comprises a fixed cutter (4) and a movable cutter (10), the fixed cutter (4) is fixed on the cutter holder (3), the movable cutter (10) is fixed at the other end of the cutter shaft (5), and the fixed cutter (4) and the movable cutter (10) can be engaged and disengaged.