CN212533357U

CN212533357U - Automatic lift presser foot mechanism

Info

Publication number: CN212533357U
Application number: CN202020760335.4U
Authority: CN
Inventors: 鲁亚东; 朱金聪
Original assignee: Jack Sewing Machine Co Ltd
Current assignee: Jack Technology Co Ltd
Priority date: 2020-05-09
Filing date: 2020-05-09
Publication date: 2021-02-12
Anticipated expiration: 2030-05-09

Abstract

The utility model provides an automatic lift presser foot mechanism belongs to sewing equipment technical field. It has solved the current automatic problem of lifting its unstable operation of presser foot mechanism. This automatic presser foot mechanism lifts, include drive mechanism and be used for the drive source of drive mechanism motion, drive mechanism includes presser foot lift assembly and link assembly, its characterized in that: the drive source is a stepping motor, the transmission mechanism further comprises a transmission piece, and the stepping motor drives the connecting rod assembly to move through the transmission piece so as to realize the lifting of the presser foot lifting assembly. The automatic presser foot lifting mechanism has the advantages of accurate positioning and low noise.

Description

Automatic lift presser foot mechanism

Technical Field

The utility model belongs to the technical field of sewing equipment, especially, relate to an automatic lift presser foot mechanism.

Background

When the sewing machine feeds materials, the presser foot presses on the cloth, and when the sewing machine feeds materials and discharges the materials, the presser foot is lifted upwards and is generally controlled by a presser foot lifting mechanism. The traditional presser foot lifting mechanism is driven by manpower, the labor intensity of operators is high, and the presser foot is frequently lifted for a long time to cause body ache and the reduction of the working efficiency. With the continuous improvement of the automation degree, many industrial sewing machines adopt an automatic presser foot lifting mechanism to realize the sewing automation.

Chinese patent (publication No. CN206545107U, published as 2017.10.10) discloses an automatic presser foot lifting device of a lockstitch sewing machine, which comprises an electromagnet, a rear lever and a pull rod, wherein the rear lever comprises a cylinder body, the cylinder body is provided with a circular through hole, a hinged shaft is hinged in the through hole, a first protruding part extending upwards is arranged above the cylinder body, a second protruding part extending downwards is arranged below the cylinder body, one end of the pull rod is hinged with the first protruding part, and a top post of the electromagnet is opposite to the first protruding part. According to the scheme, the electromagnet is used as a driving source of the presser foot lifting mechanism, labor force can be reduced, work efficiency is improved, noise is high, and after the electromagnet generates heat for a long time, the magnetic force of the electromagnet is weakened, the presser foot cannot be lifted to the original height, so that the stability of the presser foot lifting action is not ideal.

Chinese patent (publication No. CN207047493U, published as 2018.02.27) discloses a pneumatic presser foot lifting mechanism of a sewing machine, which comprises a cylinder, a rotating shaft, a lifting plate and a pressing rod, wherein a transmission component is arranged between the cylinder and the rotating shaft, a transmission mechanism is arranged between the lifting plate and the pressing rod, the transmission component comprises a crank which is fixedly connected on the rotating shaft and rotates along with the action of the cylinder, the crank is positioned at one end of the rotating shaft, which is close to the lifting plate, a driving part which protrudes outwards relative to the crank is integrally formed at one end of the crank, which is close to the lifting plate, and the driving part is abutted against the lifting plate and can drive the lifting plate to rotate when the crank rotates. The air cylinder is used as a driving source, so that the noise is high, and the air cylinder cannot be normally used when no air source exists or the air source is unstable.

As described above, neither electromagnet nor cylinder is used as a driving source, which is not satisfactory.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the technical problem and providing an automatic presser foot lifting mechanism.

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

an automatic presser foot lifting mechanism comprises a transmission mechanism and a driving source for driving the transmission mechanism to move, wherein the transmission mechanism comprises a presser foot lifting assembly and a connecting rod assembly, and is characterized in that: the drive source is a stepping motor, the transmission mechanism further comprises a transmission piece, and the stepping motor drives the connecting rod assembly to move through the transmission piece so as to realize the lifting of the presser foot lifting assembly.

In the automatic presser foot lifting mechanism, the transmission member is a gear assembly composed of a first gear and a second gear which are meshed with each other, the first gear is connected with an output shaft of the stepping motor, and the second gear is rotatably connected with a sewing machine shell through a gear shaft.

In the above automatic presser foot lifting mechanism, the connecting rod assembly includes a connecting rod, a first lever and a pull rod; the second gear is fixedly connected with a screw, one end of the connecting rod is sleeved on the screw and is in rotating connection with the screw, the other end of the connecting rod is in sliding connection with one end of the first lever, the middle of the first lever is in rotatable connection with the sewing machine shell through an axial position screw, the other end of the first lever is connected with a pull rod, the other end of the pull rod is connected with the presser foot lifting assembly, and the left and right movement of the pull rod can drive the presser foot lifting assembly to move up and down.

In the above automatic presser foot lifting mechanism, the automatic presser foot lifting mechanism further comprises a knee control ejector rod and an electronic knee rest mounted at the lower end of the knee control ejector rod; the first lever is T-shaped and is provided with a first end, a second end and a third end, and the first end is connected with the pull rod; an arc-shaped groove is formed in the other end of the connecting rod, a pin matched with the arc-shaped groove is fixedly connected to the second end of the connecting rod, and the pin can move back and forth in the arc-shaped groove to realize the sliding connection; and the third end is connected with the upper end of the knee control ejector rod, and when the electronic knee is driven to work, the electronic knee drives the knee control ejector rod to move upwards so as to drive the presser foot lifting assembly to move upwards through the connecting rod assembly, the pin can move in the arc-shaped groove.

In the above automatic presser foot lifting mechanism, the second gear is a sector gear.

In the above automatic presser foot lifting mechanism, the transmission member is a gear assembly composed of a gear and a rack.

In the above automatic presser foot lifting mechanism, the presser foot lifting assembly includes a second lever having a fixed swing fulcrum, a pressing rod capable of moving up and down, and a pressing rod guide fixed on the pressing rod; one end of the second lever is hinged with the pull rod, the other end of the second lever drives the press rod to move up and down through the driving press rod guide frame, and a press foot is arranged at the lower end of the press rod.

In the above automatic presser foot lifting mechanism, the stepping motor is mounted on the back of the sewing machine housing.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model discloses a step motor realizes lifting the presser foot automatically, can realize corresponding parameter's control and regulation through control and adjusting motor's turned angle, for example realize lifting the control and the regulation of presser foot height for the sewing machine can be applicable to the cloth of different thickness, improves and makes up the effect.

2. The utility model adopts the stepping motor as the driving source, which not only has fast response and accurate positioning, but also can not cause the problem of improper presser foot lifting action due to insufficient power; and the service life is long, the running noise is low, and the performance of the sewing machine can be effectively improved.

3. The utility model discloses add the electron knee and lean on, operating personnel can select suitable presser foot mode of lifting according to the actual condition of making up, reduces operating personnel's intensity of labour, and easy operation, flexibility are strong. In addition, the switching use of the two can avoid the use fatigue of the sewing machine when the presser foot lifting mode is used singly, and the service life is prolonged.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is an exploded schematic view of the present invention.

Fig. 3 is a schematic structural diagram of the first lever of the present invention.

In the figure, 1, a stepping motor; 2. a presser foot lift assembly; 21. a second lever; 22. a pressure lever; 23. a compression bar guide frame; 3. a connecting rod assembly; 31. a connecting rod; 311. an arc-shaped slot; 32. a first lever; 321. a first end; 322. a second end; 323. a third end; 33. a pull rod; 4. a transmission member; 41. a first gear; 42. a second gear; 5. a sewing machine housing; 6. a screw; 7. an axial screw; 8. a knee control ejector rod; 9. a pin; 10. and a presser foot.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1 and 2, the automatic presser foot lifting mechanism includes a transmission mechanism and a driving source for driving the transmission mechanism to move, and the transmission mechanism includes a presser foot lifting assembly 2 and a connecting rod assembly 3. The driving source is a stepping motor 1 mounted on the back of the sewing machine housing 5. The transmission mechanism further comprises a transmission piece 4, and the stepping motor 1 drives the connecting rod assembly 3 to move through the transmission piece 4 so as to realize the lifting of the presser foot lifting assembly 2.

The utility model discloses a step motor 1 is as the driving source, and step motor 1 is the open loop control motor who changes electric pulse signal into angle displacement or linear displacement, realizes corresponding parameter's control and regulation through control and the turned angle of adjusting step motor 1, for example realizes lifting the control and the regulation of presser foot height for the sewing machine can be applicable to the seam material of different thickness, improves and makes up the effect. In addition, compared with the existing electromagnet or air cylinder, the stepping motor 1 also has the advantages of quick response and accurate positioning, and the problem of insufficient pressure foot lifting action caused by insufficient power can be avoided; and the service life is long, the running noise is low, and the performance of the sewing machine can be effectively improved.

As a further optimization of the embodiment, the transmission member 4 is a gear assembly composed of a first gear 41 and a second gear 42 which are meshed with each other, and preferably, the second gear 42 in the embodiment is a sector gear, and the sector gear makes the structure of the transmission member 4 practical and compact. The first gear 41 is connected with the output shaft of the stepping motor 1, and the second gear 42 is rotatably connected with the sewing machine shell 5 through a gear shaft. The utility model provides a gear drive precision is high, the operation is reliable. Of course, the transmission member 4 may be a gear assembly composed of a gear and a rack in addition to the above structure.

The connecting rod assembly 3 of the utility model comprises a connecting rod 31, a first lever 32 and a pull rod 33; the second gear 42 is fixedly connected with a screw 6, one end of the connecting rod 31 is sleeved on the screw 6 and is rotatably connected with the screw 6, the other end of the connecting rod 31 is slidably connected with one end of the first lever 32, the middle part of the first lever 32 is rotatably connected with the sewing machine shell 5 through a shaft position screw 7, the other end of the first lever 32 is connected with a pull rod 33, the other end of the pull rod 33 is connected with the presser foot lifting assembly 2, and the left and right movement of the pull rod 33 can drive the presser foot lifting assembly 2 to move up and down.

After the sewing machine is powered on and started, the stepping motor 1 drives the gear I41 to rotate through the output shaft, the gear I41 drives the gear II 42 meshed with the gear I to rotate around the gear shaft, at the moment, the connecting rod 31 fixed on the gear II 42 through the screw 6 also moves leftwards, the first lever 32 connected with the gear II in a sliding mode is driven to rotate anticlockwise around the axial screw 7, the pull rod 33 connected with the first lever 32 is driven to move rightwards, and the presser foot lifting assembly 2 connected with the pull rod 33 is driven to move upwards.

As shown in fig. 3, the automatic presser foot lifting mechanism further includes a knee control ejector rod 8 and an electronic knee rest mounted at the lower end of the knee control ejector rod 8. The electronic knee rest is the prior art, and has the advantages of time saving and labor saving. The utility model is provided with the stepping motor 1 and an electronic knee backrest, so that the operator can select a proper presser foot lifting mode according to the actual sewing condition, and the labor intensity of the operator is reduced; meanwhile, the lifting height can be adjusted, the operation is simple, and the flexibility is strong. In addition, the switching use of the two can avoid the use fatigue of the sewing machine when the presser foot lifting mode is used singly, and the service life is prolonged.

Preferably, the first lever 32 of the present invention is T-shaped, and has a first end 321, a second end 322 and a third end 323, wherein the first end 321 is connected to the pull rod 33; the other end of the connecting rod 31 is provided with an arc-shaped groove 311, the second end 322 is fixedly connected with a pin 9 matched with the arc-shaped groove 311, and the pin 9 can move back and forth in the arc-shaped groove 311 to realize sliding connection; the third end 323 is connected with the upper end of the knee control ejector rod 8, and when the electronic knee is driven to work, the electronic knee drives the knee control ejector rod 8 to move upwards so as to drive the presser foot lifting assembly 2 to move upwards through the connecting rod assembly 3, the pin 9 can move in the arc-shaped groove 311. The arc-shaped slot 311 plays a role in blocking force transmission between the first lever and the gear assembly, so that the movement of the first lever and the gear assembly is not interfered with each other, and the presser foot lifting mode of the first lever and the presser foot lifting mode of the second lever are switched freely.

The presser foot lifting assembly 2 in the utility model comprises a second lever 21 with a fixed swing fulcrum, a pressure bar 22 capable of moving up and down and a pressure bar guide frame 23 fixed on the pressure bar 22; one end of the second lever 21 is hinged with the pull rod 33, the other end drives the press rod 22 to move up and down through driving the press rod guide frame 23, and the lower end of the press rod 22 is provided with the press foot 10. When the stepping motor 1 or the electronic knee is driven to lift the presser foot, the pull rod 33 moves rightwards to drive the second lever 21 connected with the pull rod to rotate clockwise around the fixed swing fulcrum, and the second lever 21 is connected with the pressure rod guide frame 23 of the fixed pressure rod 22, so that the second lever 21 drives the pressure rod 22 to move upwards together through the pressure rod guide frame 23, and further drives the presser foot 10 arranged at the lower end of the pressure rod 22 to move upwards, and the action of lifting the presser foot is realized.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Although the terms stepper motor 1, presser foot lift assembly 2, link assembly 3, link 31, arcuate slot 311, first lever 32, first end 321, second end 322, third end 323, pull rod 33, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.

Claims

1. An automatic presser foot lifting mechanism comprises a transmission mechanism and a driving source for driving the transmission mechanism to move, wherein the transmission mechanism comprises a presser foot lifting assembly (2) and a connecting rod assembly (3), and is characterized in that: the drive source is a stepping motor (1), the transmission mechanism further comprises a transmission piece (4), and the stepping motor (1) drives the connecting rod assembly (3) to move through the transmission piece (4) so as to realize the lifting of the presser foot lifting assembly (2).

2. The automatic presser foot lifting mechanism of claim 1, wherein: the transmission piece (4) is a gear assembly consisting of a first gear (41) and a second gear (42) which are meshed with each other, the first gear (41) is connected with an output shaft of the stepping motor (1), and the second gear (42) is rotatably connected with the sewing machine shell (5) through a gear shaft.

3. The automatic presser foot lifting mechanism of claim 2, wherein: the connecting rod assembly (3) comprises a connecting rod (31), a first lever (32) and a pull rod (33); the second gear (42) is fixedly connected with a screw (6), one end of the connecting rod (31) is sleeved on the screw (6) and is rotatably connected with the screw (6), the other end of the connecting rod (31) is slidably connected with one end of the first lever (32), the middle of the first lever (32) is rotatably connected with the sewing machine shell (5) through a shaft position screw (7), the other end of the first lever (32) is connected with the pull rod (33), the other end of the pull rod (33) is connected with the presser foot lifting assembly (2), and the left and right movement of the pull rod (33) can drive the presser foot lifting assembly (2) to move up and down.

4. An automatic presser foot lifting mechanism according to claim 3, wherein: the automatic presser foot lifting mechanism also comprises a knee control ejector rod (8) and an electronic knee rest arranged at the lower end of the knee control ejector rod (8); the first lever (32) is T-shaped and is provided with a first end (321), a second end (322) and a third end (323), and the first end (321) is connected with the pull rod (33); an arc-shaped groove (311) is formed in the other end of the connecting rod (31), a pin (9) matched with the arc-shaped groove (311) is fixedly connected to the second end (322), and the pin (9) can move back and forth in the arc-shaped groove (311) to achieve the sliding connection; the third end (323) is connected with the upper end of the knee control ejector rod (8), and when the electronic knee is driven to work, the electronic knee drives the knee control ejector rod (8) to move upwards so as to drive the presser foot lifting assembly (2) to move upwards through the connecting rod assembly (3), the pin (9) can move in the arc-shaped groove (311).

5. The automatic presser foot lifting mechanism of claim 2, wherein: the second gear (42) is a sector gear.

6. The automatic presser foot lifting mechanism of claim 1, wherein: the transmission piece (4) is a gear assembly consisting of a gear and a rack.

7. The automatic presser foot lifting mechanism of claim 4, wherein: the presser foot lifting assembly (2) comprises a second lever (21) with a fixed swing fulcrum, a pressure lever (22) capable of moving up and down and a pressure lever guide frame (23) fixed on the pressure lever (22); one end of the second lever (21) is hinged with the pull rod (33), the other end of the second lever drives the pressing rod (22) to move up and down through a driving pressing rod guide frame (23), and the lower end of the pressing rod (22) is provided with a pressing foot (10).

8. The automatic presser foot lifting mechanism of claim 1, wherein: the stepping motor (1) is arranged on the back of the sewing machine shell (5).