CN217026333U

CN217026333U - Thread trimming and presser foot lifting mechanism and sewing machine with same

Info

Publication number: CN217026333U
Application number: CN202123011250.XU
Authority: CN
Inventors: 林显涛; 颜文耀
Original assignee: Zhejiang Maqi Sewing Machine Co Ltd
Current assignee: Zhejiang Maqi Sewing Machine Co Ltd
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2022-07-22
Anticipated expiration: 2031-11-30

Abstract

The utility model relates to the technical field of sewing equipment, and discloses a thread trimming and presser foot lifting mechanism and a sewing machine with the same, wherein the thread trimming and presser foot lifting mechanism comprises a driving motor, a presser foot lifting assembly and a thread trimming assembly, wherein the presser foot lifting assembly and the thread trimming assembly are driven by the driving motor to act, and the thread trimming cam and the presser foot lifting cam are fixedly sleeved on a motor shaft of the driving motor; the wire cutting device comprises a shell, a driving shaft and a wire cutting lever, wherein the driving shaft is rotatably arranged on the shell, the driving shaft is vertically arranged at the upper end of the wire cutting lever, the outer surface of a wire cutting cam is abutted against the upper end of the driving shaft, the lower end of the driving shaft is abutted against one end of the wire cutting lever, and the other end of the wire cutting lever is connected with a wire cutting assembly; the outer surface of the presser foot lifting cam is abutted against the upper end of the presser foot lifting lever, and the lower end of the presser foot lifting lever is connected with the presser foot lifting assembly. The utility model simplifies the driving structure and the driving mode of the presser foot lifting component and the thread trimming component.

Description

Thread trimming and presser foot lifting mechanism and sewing machine with same

Technical Field

The utility model relates to the technical field of sewing equipment, in particular to a thread cutting and presser foot lifting mechanism and a sewing machine with the same.

Background

The presser foot lifting and thread trimming device of the existing sewing machine is split, is driven by electromagnets or cylinders independently, and has the advantages of more input signals, large control difficulty, complex structure, large installation difficulty and high cost. For example, the Chinese utility model patent (application number: CN201120549101.6) discloses a pneumatic type presser foot lifting and thread trimming driving structure on a overedger, wherein a presser foot lifting cylinder and a thread trimming cylinder are respectively fixed at the left side and the right side of the rear part of the overedger, a piston at the lower end of the presser foot lifting cylinder is in threaded connection with a presser foot lifting connecting rod, the right end of a presser foot lifting lever is hinged on a casing of the overedger, the lower end of a hook is hooked at one side of the presser foot lifting lever close to the right end, the upper end of the hook is connected with a small presser foot lifting lever, the small presser foot lifting lever is connected with a presser foot shaft, and the presser foot shaft is connected with a presser foot arm; the lower end of the trimming cylinder is provided with a trimming lever, one end of the trimming lever is provided with a trimming connecting rod, the other end of the trimming lever is fixed at one end of the cutter shaft, the trimming connecting rod is in threaded connection with a piston of the trimming cylinder, and the other end of the cutter shaft is provided with a trimming cutter. The two cylinders in the above patent drive the equipment cost and the cylinders themselves also affect the functional life.

Disclosure of Invention

Aiming at the defects in the prior art, the utility model provides a thread cutting and presser foot lifting mechanism and a sewing machine with the same.

In order to solve the technical problems, the utility model is solved by the following technical scheme:

a thread trimming and presser foot lifting mechanism comprises a driving motor, a presser foot lifting assembly, a thread trimming cam and a presser foot lifting cam, wherein the thread trimming lifting assembly and the thread trimming assembly are driven by the driving motor to act;

the wire cutting device comprises a shell, a driving shaft and a wire cutting lever, wherein the driving shaft is rotatably arranged on the shell, the driving shaft is vertically arranged at the upper end of the wire cutting lever, the outer surface of a wire cutting cam is abutted against the upper end of the driving shaft and pushes the driving shaft to vertically move, the lower end of the driving shaft is abutted against one end side of the wire cutting lever, and the other end of the wire cutting lever is connected with a wire cutting assembly;

the outer surface of the pressure foot lifting cam is abutted against the upper end of the pressure foot lifting lever and pushes the pressure foot lifting lever to move transversely, and the lower end of the pressure foot lifting lever is connected with the pressure foot lifting assembly.

Preferably, still including installing the mounting bracket on the casing fixedly, the mounting bracket includes the locating piece and the vertical setting of horizontal setting and install in the mounting panel of casing, the locating piece set up in the upper end of mounting panel and with mounting panel fixed connection, the drive shaft passes through to locate in the locating piece with removing.

As preferred, the trimming lever passes through axle position screw and rotationally installs in the lower extreme of mounting panel, and axle position screw wears to locate the middle part of trimming lever, and one side upper end of trimming lever is equipped with the bottom plate that extends to the drive shaft direction, and the lower extreme and the bottom plate of drive shaft offset, and the opposite side of trimming lever is equipped with the U type groove of opening towards the trimming subassembly, and the trimming lever passes through the U type groove and is connected with the trimming subassembly.

Preferably, the clamping spring and the compression spring are further included, the clamping spring is fixedly sleeved at the upper end of the driving shaft, the compression spring is sleeved on the driving shaft, and two ends of the compression spring are respectively abutted against the clamping spring and the positioning block.

Preferably, the wire cutting machine further comprises a connecting swing rod, a connecting shaft perpendicular to the connecting swing rod is arranged at one end of the connecting swing rod, the connecting shaft movably penetrates through the U-shaped groove, and the other end of the connecting swing rod is connected with the wire cutting assembly.

Preferably, the wire shearing device further comprises a torsion spring, the torsion spring is sleeved on the shaft position screw, one end of the torsion spring is located below the wire shearing lever and is fixedly connected to the mounting plate, and the other end of the torsion spring is abutted to the upper end of the U-shaped groove.

Preferably, the presser foot lifting lever comprises a vertical rod and a cross rod, the cross rod is located at the lower end of the vertical rod and extends towards the presser foot lifting assembly, and a longitudinal rod connecting the vertical rod and the cross rod is arranged between the vertical rod and the cross rod.

Preferably, the lifting mechanism further comprises a presser foot shaft, the presser foot shaft is arranged in parallel with the longitudinal rod, the end part of the transverse rod is connected with one end of the presser foot shaft and drives the presser foot shaft to rotate, and the other end of the presser foot shaft is connected with the presser foot lifting assembly.

Preferably, the device further comprises a presser foot arm and a swing rod, the lower end of the swing rod is connected with the presser foot shaft and synchronously rotates with the presser foot shaft, the upper end of the swing rod is connected with one end of the presser foot arm, and the other end of the presser foot arm is connected with the presser foot lifting assembly.

A sewing machine comprises the thread cutting and presser foot lifting mechanism.

Due to the adoption of the technical scheme, the utility model has the remarkable technical effects that: the rotation of the thread trimming cam and the rotation of the presser foot lifting cam are respectively controlled through the rotation direction of one driving motor, the thread trimming cam correspondingly controls the action of the presser foot lifting assembly and the action of the thread trimming assembly respectively through a driving shaft and a thread trimming lever, and the presser foot lifting lever correspondingly controls the action of the presser foot lifting assembly and the thread trimming assembly through the presser foot lifting lever, so that the driving structure and the driving mode of the presser foot lifting assembly and the thread trimming assembly are simplified, and the installation space in the sewing machine is saved.

Drawings

Fig. 1 is a schematic view of a structure of a sewing machine.

Fig. 2 is an exploded view of the thread trimming and presser foot lifting mechanism.

Fig. 3 is a schematic view of a first perspective structure of the thread trimming and presser foot lifting mechanism.

Fig. 4 is a second perspective view of the thread trimming and presser foot lifting mechanism.

The names of the parts designated by the numerical references in the drawings are as follows: 1-driving motor, 2-trimming assembly, 3-presser foot lifting assembly, 4-trimming cam, 5-presser foot lifting cam, 6-motor shaft, 7-driving shaft, 8-machine shell, 9-trimming lever, 901-bottom plate, 902-U-shaped groove, 10-presser foot lifting lever, 101-vertical rod, 102-horizontal rod, 103-longitudinal rod, 11-mounting frame, 111-positioning block, 112-mounting plate, 12-axial position screw, 13-snap spring, 14-compression spring, 15-connecting swing rod, 16-connecting shaft, 17-torsion spring, 18-presser foot shaft, 19-presser foot arm and 20-swing rod.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Example 1

A thread trimming and presser foot lifting mechanism is disclosed, as shown in figures 1 to 4, and comprises a driving motor 1, a thread trimming component 2 and a presser foot lifting component 3, wherein the driving motor 1 is arranged on one side of a machine shell 8 through a motor mounting frame, the thread trimming component 2 and the presser foot lifting component 3 are driven by the driving motor 1 to act, the thread trimming mechanism further comprises a thread trimming cam 4 and a presser foot lifting cam 5, and the thread trimming cam 4 and the presser foot lifting cam 5 are fixedly sleeved on a motor shaft 6 of the driving motor 1 and synchronously rotate with the motor shaft 6;

the wire cutting machine is characterized by further comprising a driving shaft 7 and a wire cutting lever 9 which is rotatably installed on the machine shell 8, wherein the driving shaft 7 is vertically arranged at the upper end of the wire cutting lever 9, the outer surface of the wire cutting cam 4 abuts against the upper end of the driving shaft 7 and pushes the driving shaft 7 to vertically move, the lower end of the driving shaft 7 abuts against one end of the wire cutting lever 9, and the other end of the wire cutting lever 9 is connected with the wire cutting assembly 2.

The outer surface of the pressure foot lifting cam 5 is abutted against the upper end of the pressure foot lifting lever 10 and pushes the pressure foot lifting lever 10 to move transversely, and the lower end of the pressure foot lifting lever 10 is connected with the pressure foot lifting assembly 3. The rotation of the thread trimming cam 4 and the rotation of the presser foot lifting cam 5 are respectively controlled through the rotation direction of one driving motor 1, the thread trimming cam 4 correspondingly controls the action of the presser foot lifting assembly 2 and the action of the thread trimming assembly 3 through a driving shaft 7 and a thread trimming lever 9 and the action of the presser foot lifting lever 10 through the presser foot lifting lever 10, the driving structure and the driving mode of the presser foot lifting assembly 2 and the thread trimming assembly 3 are simplified, and the installation space in the sewing machine is saved.

Still including installing the mounting bracket 11 on casing 8 fixedly, mounting bracket 11 includes the locating piece 111 of horizontal setting and vertical setting and install in the mounting panel 112 of casing 8, and locating piece 111 sets up in the upper end of mounting panel 112 and with mounting panel 112 fixed connection, and drive shaft 7 wears to locate in locating piece 111 with removing. The positioning block 111 is fixedly installed on the machine shell 8, positions the driving shaft 7 during vertical movement, prevents the driving shaft 7 from rotating, and improves stability of the driving shaft 7 during vertical movement.

The thread trimming lever 9 is rotatably mounted at the lower end of the mounting plate 112 through a shaft screw 12, and the shaft screw 12 penetrates through the middle of the thread trimming lever 9. The mounting plate 112 is fixedly mounted on the machine shell 8, and the trimming lever 9 is mounted on the mounting plate 112 and can rotate on the mounting plate 112, so that the stability and flexibility of the trimming lever 9 during rotation are improved. A bottom plate 901 extending towards the driving shaft 7 is arranged at the upper end of one side of the trimming lever 9, the lower end of the driving shaft 7 is abutted against the bottom plate 901, a U-shaped groove 902 with an opening facing the trimming assembly 2 is arranged at the other side of the trimming lever 9, and the trimming lever 9 is connected with the trimming assembly 2 through the U-shaped groove 902. The driving shaft 7 drives the thread trimming assembly 2 to synchronously act through the bottom plate 901 and the U-shaped groove 902 of the thread trimming lever 9, so that the transmission structure between the driving shaft 7 and the thread trimming assembly 2 is simplified, and the transmission mode is also simplified.

The clamping spring 13 is fixedly sleeved at the upper end of the driving shaft 7, the compression spring 14 is sleeved on the driving shaft 7, and two ends of the compression spring 14 are respectively abutted against the clamping spring 13 and the positioning block 111. The driving shaft 7 moves downwards under the pushing of the trimming cam 4, the compression spring 14 is compressed, and after the trimming cam 4 is reset under the driving of the driving motor 1, the compression spring 14 resets and pushes the driving shaft 7 to move upwards for resetting, so that the resetting mechanism and the resetting mode of the driving shaft 7 are simplified.

The wire cutting machine further comprises a connecting swing rod 15, a connecting shaft 16 which is perpendicular to the connecting swing rod 15 is arranged at one end of the connecting swing rod 15, the connecting shaft 16 is movably arranged in the U-shaped groove 902 in a penetrating mode, and the other end of the connecting swing rod 15 is connected with the wire cutting assembly 2. The U-shaped groove 902 rotates upward under the pushing of the driving shaft 7, the U-shaped groove 902 lifts upward and pushes the connecting shaft 16 to slide in the U-shaped groove 902, so that the connecting swing rod 15 swings along with the U-shaped groove, the wire cutting assembly 2 is driven to move, and the driving structure and the driving mode of the wire cutting assembly 2 are simplified.

The wire shearing device further comprises a torsion spring 17, the torsion spring 17 is sleeved on the shaft position screw 12, one end of the torsion spring 17 is located below the wire shearing lever 9 and is fixedly connected to the mounting plate 112, and the other end of the torsion spring 17 is abutted to the upper end of the U-shaped groove 902. When the driving shaft 7 pushes the bottom plate 901 on the trimming lever 9 to move downwards and the trimming assembly 2 finishes trimming, the driving motor 1 resets, and the torsion spring 17 pushes the trimming lever 9 to reset, so that the resetting structure of the trimming lever 9 is simplified.

Example 2

A thread trimming and presser foot lifting mechanism is disclosed, as shown in fig. 1 to 4, on the basis of embodiment 1, a presser foot lifting lever 10 comprises a vertical rod 101 and a cross rod 102, the cross rod 102 is located at the lower end of the vertical rod 101 and extends towards a presser foot lifting assembly 3, the middle part of the cross rod 102 is connected to a machine shell 8 through an axial position screw, a presser foot lifting cam 5 pushes the vertical rod 101 to rotate outwards, and one end of the cross rod 102, which is far away from the vertical rod 101, is lifted upwards and drives the presser foot lifting assembly 3 to move. Between the vertical rod 101 and the horizontal rod 102, there is a vertical rod 103 connecting the two. Facilitating the mounting of the presser foot lifting lever 10 within the housing 8.

The presser foot lifting mechanism further comprises a presser foot shaft 18, the presser foot shaft 18 is arranged in parallel with the longitudinal rod 103, the end part of the cross rod 102 is connected with one end of the presser foot shaft 18 and drives the presser foot shaft 18 to rotate, and the other end of the presser foot shaft 18 is connected with the presser foot lifting assembly 3. One end of the cross bar 102 far away from the vertical bar 101 swings upwards, and simultaneously drives the presser foot shaft 18 to rotate, and the presser foot shaft 18 drives the presser foot lifting assembly 3 to perform the presser foot lifting action.

The device further comprises a presser foot arm 19 and a swing rod 20, the lower end of the swing rod 20 is connected with the presser foot shaft 18 and synchronously rotates with the presser foot shaft 18, the upper end of the swing rod 20 is connected with one end of the presser foot arm 19, and the other end of the presser foot arm 19 is connected with the presser foot lifting assembly 3. The lower end of the swing rod 20 is sleeved at one end of the presser foot shaft 18, the presser foot shaft 18 drives the swing rod 20 to synchronously rotate when rotating, so that the swing rod 20 rotates towards the direction far away from the presser foot arm 19, one end of the presser foot arm 19 far away from the swing rod 20 is upwards lifted, the presser foot lifting component 3 is positioned at the other end of the presser foot arm 19 and upwards lifted along with the other end of the presser foot arm 19, and the presser foot lifting action is completed.

Example 3

A sewing machine, as shown in figures 1 to 4, includes a thread trimming and presser foot lifting mechanism as described above.

Claims

1. The utility model provides a trimming and lift presser foot mechanism, includes driving motor (1), lifts presser foot subassembly (3) and trimming subassembly (2) and moves its characterized in that by driving motor (1) drive: the thread trimming cam (4) and the presser foot lifting cam (5) are fixedly sleeved on a motor shaft (6) of the driving motor (1) and synchronously rotate with the motor shaft (6);

the wire shearing machine is characterized by further comprising a driving shaft (7) and a wire shearing lever (9) rotatably mounted on the machine shell (8), wherein the driving shaft (7) is vertically arranged at the upper end of the wire shearing lever (9), the outer surface of the wire shearing cam (4) is abutted to the upper end of the driving shaft (7) and pushes the driving shaft (7) to vertically move, the lower end of the driving shaft (7) is abutted to one end side of the wire shearing lever (9), and the other end of the wire shearing lever (9) is connected with the wire shearing assembly (2);

the outer surface of the presser foot lifting cam (5) is abutted against the upper end of the presser foot lifting lever (10) and pushes the presser foot lifting lever (10) to move transversely, and the lower end of the presser foot lifting lever (10) is connected with the presser foot lifting assembly (3).

2. A thread trimming and presser foot lifting mechanism according to claim 1, wherein: still including installing mounting bracket (11) on casing (8) fixedly, mounting bracket (11) are including locating piece (111) and the vertical setting that transversely sets up and install in mounting panel (112) of casing (8), locating piece (111) set up in the upper end of mounting panel (112) and with mounting panel (112) fixed connection, drive shaft (7) wear to locate in locating piece (111) with removing.

3. A thread trimming and presser foot lifting mechanism according to claim 2, wherein: trimming lever (9) rotationally installs in the lower extreme of mounting panel (112) through axle position screw (12), axle position screw (12) wear to locate the middle part of trimming lever (9), one side upper end of trimming lever (9) is equipped with bottom plate (901) that extend to drive shaft (7) direction, the lower extreme and bottom plate (901) of drive shaft (7) offset, the opposite side of trimming lever (9) is equipped with opening U type groove (902) towards trimming subassembly (2), trimming lever (9) are connected with trimming subassembly (2) through U type groove (902).

4. A thread trimming and presser foot lifting mechanism according to claim 2, wherein: the clamping spring (13) is fixedly sleeved at the upper end of the driving shaft (7), the compression spring (14) is sleeved on the driving shaft (7), and two ends of the compression spring (14) are respectively abutted against the clamping spring (13) and the positioning block (111).

5. A thread trimming and presser foot lifting mechanism according to claim 3, wherein: still including connecting pendulum rod (15), the one end of connecting pendulum rod (15) is equipped with and connects connecting axle (16) that pendulum rod (15) set up perpendicularly, and in U type groove (902) were worn to locate movably in connecting axle (16), the other end of connecting pendulum rod (15) was connected with trimming subassembly (2).

6. A thread trimming and presser foot lifting mechanism according to claim 3, wherein: the wire shearing device is characterized by further comprising a torsion spring (17), wherein the shaft position screw (12) is sleeved with the torsion spring (17), one end of the torsion spring (17) is located below the wire shearing lever (9) and is fixedly connected to the mounting plate (112), and the other end of the torsion spring (17) is abutted to the upper end of the U-shaped groove (902).

7. A thread trimming and presser foot lifting mechanism according to claim 1, wherein: the presser foot lifting lever (10) comprises a vertical rod (101) and a cross rod (102), the cross rod (102) is located at the lower end of the vertical rod (101) and extends towards the presser foot lifting assembly (3), and a longitudinal rod (103) which is connected with the vertical rod (101) and the cross rod (102) is arranged between the vertical rod (101) and the cross rod (102).

8. A thread trimming and presser foot lifting mechanism according to claim 7, wherein: the presser foot lifting mechanism is characterized by further comprising a presser foot shaft (18), wherein the presser foot shaft (18) and the longitudinal rod (103) are arranged in parallel, the end part of the cross rod (102) is connected with one end of the presser foot shaft (18) and drives the presser foot shaft (18) to rotate, and the other end of the presser foot shaft (18) is connected with the presser foot lifting assembly (3).

9. A thread trimming and presser foot lifting mechanism according to claim 8, wherein: the device is characterized by further comprising a presser foot arm (19) and a swing rod (20), wherein the lower end of the swing rod (20) is connected with the presser foot shaft (18) and rotates synchronously with the presser foot shaft (18), the upper end of the swing rod (20) is connected with one end of the presser foot arm (19), and the other end of the presser foot arm (19) is connected with the presser foot lifting assembly (3).

10. A sewing machine characterized in that: comprising a thread trimming and presser foot lifting mechanism as claimed in any one of claims 1 to 9.