CN212270390U

CN212270390U - Sewing machine and presser foot lifting device for sewing machine

Info

Publication number: CN212270390U
Application number: CN202020254406.3U
Authority: CN
Inventors: 戴慧琪; 何清; 张伟伟
Original assignee: Zhejiang Maqi Sewing Machine Co Ltd
Current assignee: Zhejiang Maqi Sewing Machine Co Ltd
Priority date: 2020-03-04
Filing date: 2020-03-04
Publication date: 2021-01-01
Anticipated expiration: 2030-03-04

Abstract

The utility model relates to a sewing machine technical field discloses a sewing machine and be used for sewing machine lift presser foot device thereof, including driving motor (1), swing crank (2), pull rod (3), driving motor (1) is connected with the one end of swing crank (2), and the other end of swing crank (2) is equipped with back lever (4) of being connected with swing crank (2), and back lever (4) are connected with the one end of pull rod (3), and the other end of pull rod (3) is equipped with preceding lever (10) of being connected with pull rod (3), is equipped with presser foot (11) of being connected with preceding lever (10) on preceding lever (10). The utility model discloses a driving motor drive swing crank swings, and swing crank drives back lever swing and pulling pull rod back-and-forth movement again, and the front lever drives the presser foot under the drive of pull rod and reciprocates, and the presser foot lifts to the high point arm apart from big more in this technique, and the moment of production is little less to reduce the temperature extension driving motor life-span that driving motor produced at long-time during operation.

Description

Sewing machine and presser foot lifting device for sewing machine

Technical Field

The utility model relates to a sewing machine technical field especially relates to a sewing machine and be used for sewing machine lift presser foot device thereof.

Background

The sewing machine on the existing market generally uses the electromagnet to drive and lift the presser foot function, the driving mode structure is complex, the transmission efficiency is low, the common electromagnet can generate collision noise, the long-time electrification is easy to generate heat, and the failure rate is higher. For example, the Chinese utility model patent (application number: CN201720536808.0) relates to a presser foot lifting device, belonging to the technical field of sewing machines. It has solved the problem that the current presser foot device of lifting can only carry out automatically controlled presser foot of lifting. The presser foot lifting device comprises an electromagnet, a first crank, a first connecting rod, a transmission assembly, a presser foot assembly, a knee control ejector rod, a second crank and a second connecting rod, wherein the corner of the first crank is hinged to a shell of the sewing machine, the upper end of the first crank is used for being connected with the rear end of the first connecting rod, an iron core of the electromagnet is abutted against the end part of the lower end of the first crank, the corner of the second crank is used for being hinged to the shell of the sewing machine, the front end of the first connecting rod is hinged to the front end of the second crank, the rear end of the second connecting rod is hinged to the front end of the second crank, the front end of the second connecting rod is connected with the transmission assembly, and the top of the knee control ejector rod is hinged to the rear end of the second crank. The presser foot lifting device in the patent is complex in structure and low in transmission efficiency.

Disclosure of Invention

The utility model discloses to poor, the inefficiency shortcoming of driving motor sensitivity among the prior art, provide a sewing machine that driving motor sensitivity is good, efficient and be used for sewing machine lift presser foot device thereof.

In order to solve the technical problem, the utility model discloses a following technical scheme can solve:

a lift presser foot device for sewing machine, including driving motor, swing crank, pull rod, driving motor is connected with swing crank's one end, and swing crank's the other end is equipped with the back lever of being connected with swing crank, and the back lever is connected with the one end of pull rod, and the other end of pull rod is equipped with the front lever of being connected with the pull rod, is equipped with the presser foot of being connected with front lever on the front lever. The swing crank is driven to swing through the driving motor, the swing crank drives the rear lever to swing and pulls the pull rod to move back and forth, the front lever drives the presser foot to move up and down under the driving of the pull rod, the larger the arm distance of the high point of the presser foot lifted in the technology is, the smaller the generated torque is, so that the service life of the driving motor is prolonged by reducing the temperature generated by the driving motor during long-time working, and the performances of sensitivity, high efficiency, accuracy and reliability are guaranteed.

Preferably, the rear lever comprises a first connecting piece connected with the pull rod and a second connecting piece connected with the swing crank, the first connecting piece and the second connecting piece are arranged vertically, the upper end of the first connecting piece is connected with the pull rod through a screw, a U-shaped sliding groove is formed in the second connecting piece, a roller connected with the swing crank is arranged in the U-shaped sliding groove, and the roller is mounted on the swing crank through a shaft position screw. The swinging crank drives the roller to move back and forth in the U-shaped sliding groove of the second connecting piece, at the moment, the first connecting piece swings along with the roller, and the first connecting piece swings back and forth to drive the pull rod to move back and forth, so that the transmission structure is simplified.

Preferably, the first connecting piece and the second connecting piece are connected by a transition plate, and the transition plate is arranged in a direction away from the swing crank in an inclined manner from the first connecting piece. The installation of the rear lever in the machine shell is convenient.

Preferably, the rear lever further comprises a rubber pad mounted on the machine shell, a positioning piece extending towards the direction of the driving motor is arranged at the lower end of the second connecting piece, and the positioning piece abuts against the rubber pad when the rear lever swings downwards to the rear side. Because the roller can slide out of the groove of the lever behind the stepping presser foot lifting under the action of gravity without arranging the grating induction sheet on the driving motor, the step-out is caused, and the motor is prevented from being stepped by limiting the rubber pad through arranging the rubber pad.

As preferring, still include back luffer boards, back luffer boards pad, fixed cover, driving motor fixed mounting is on the luffer boards, and back luffer boards pad compresses tightly the side at the luffer boards through fixed cover, is equipped with the oil seal ring in the fixed cover, and the oil seal ring cover is established on driving motor's motor shaft, and driving motor's motor shaft runs through in back luffer boards and back luffer boards pad. Driving motor passes through the back luffer board and installs on the casing, makes things convenient for the dismouting and the maintenance in later stage, and driving motor installs on the luffer board through fixed cover and oil seal ring, has improved driving motor job stabilization nature.

Preferably, the upper end of the front lever is provided with a connecting column transversely extending towards one side of the front lever, the outer wall of the connecting column is provided with an annular groove, the other end of the pull rod is provided with a connecting ring formed by bending, and the connecting ring is sleeved in the annular groove. The front end of the front lever is buckled in the annular groove through the connecting ring, and the annular groove is used for limiting the connecting ring, so that the lateral movement of the front end of the front lever is prevented, and the stability of the pull rod is ensured.

Preferably, a split retaining ring is further disposed in the annular groove, and the connecting ring is disposed between the split retaining ring and the front lever. The stability of the connecting ring sleeved in the annular groove is further improved by arranging the split retainer ring.

A sewing machine comprises the presser foot lifting device for the sewing machine.

The utility model discloses owing to adopted above technical scheme, have apparent technological effect: the swing crank is driven to swing through the driving motor, the swing crank drives the rear lever to swing and pulls the pull rod to move back and forth, the front lever drives the presser foot to move up and down under the driving of the pull rod, the larger the arm distance of the high point of the presser foot lifted in the technology is, the smaller the generated torque is, so that the service life of the driving motor is prolonged by reducing the temperature generated by the driving motor during long-time working, and the performances of sensitivity, high efficiency, accuracy and reliability are guaranteed.

Drawings

Fig. 1 is a schematic diagram of the internal structure of the present invention.

Fig. 2 is an explosion diagram of the internal structure of the present invention.

Fig. 3 is a partially enlarged schematic view of the M portion in fig. 2.

Fig. 4 is a schematic structural view of the rear lever.

Fig. 5 is a schematic structural diagram of the present invention.

The names of the parts indicated by the numerical references in the drawings are as follows: 1-driving motor, 2-swing crank, 3-pull rod, 4-rear lever, 5-rear window board, 6-rear window board pad, 7-fixed sleeve, 8-machine shell, 9-oil seal ring, 10-front lever, 11-presser foot, 12-needle board, 13-first connecting piece, 14-second connecting piece, 15-U type chute, 16-roller, 17-axis screw, 18-transition board, 19-rubber pad, 20-mounting groove, 21-positioning piece, 22-connecting piece, 23-annular groove, 24-connecting ring and 25-split retainer ring.

Detailed Description

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

Example 1

A presser foot lifting device for a sewing machine is shown in figures 1 to 5 and comprises a driving motor 1, a swing crank 2 and a pull rod 3, wherein the driving motor 1 is connected with one end of the swing crank 2, the other end of the swing crank 2 is provided with a rear lever 4 connected with the swing crank 2, the rear lever 4 is connected with one end of the pull rod 3, the presser foot lifting device further comprises a rear window plate 5, a rear window plate pad 6 and a fixing sleeve 7, the rear window plate 5 is installed on a machine shell 8, the driving motor 1 is fixedly installed on the rear window plate 5, the rear window plate pad 6 is tightly pressed on the side surface of the rear window plate 5 through the fixing sleeve 7, an oil seal ring 9 is arranged in the fixing sleeve 7, the oil seal ring 9 is sleeved on a motor shaft of the driving motor 1, the motor shaft of the driving motor 1 penetrates through the rear window plate 5 and the rear window plate pad 6, the other end of the pull rod 3 is provided with, a needle plate 12 is provided below the presser foot 11, and the origin is set when the presser foot 11 is in contact with the needle plate 12.

The rear lever 4 comprises a first connecting piece 13 connected with the pull rod 3 and a second connecting piece 14 connected with the swing crank 2, the first connecting piece 13 and the second connecting piece 14 are arranged vertically, the upper end of the first connecting piece 13 is connected with the pull rod 3 through a screw, a U-shaped sliding groove 15 is formed in the second connecting piece 14, a roller 16 connected with the swing crank 2 is arranged in the U-shaped sliding groove 15, the roller 16 is installed on the swing crank 2 through a shaft position screw 17, the first connecting piece 13 and the second connecting piece 14 are connected through a transition plate 18, and the transition plate 18 is obliquely arranged in a direction away from the swing crank 2 through the first connecting piece 13.

Example 2

The presser foot lifting device for the sewing machine further comprises a rubber pad 19 mounted on the machine shell 8, as shown in fig. 1 to 5, a mounting groove 20 is arranged on the machine shell 8, one end of the rubber pad 19 is embedded in the mounting groove 20, a positioning sheet 21 extending towards the driving motor 1 is arranged at the lower end of the second connecting sheet 14, and the positioning sheet 21 abuts against the rubber pad 19 when the rear lever 4 swings downwards to the rear side.

Example 3

As shown in fig. 1 to 5, the upper end of the front lever 10 is provided with a connecting column 22 transversely extending toward one side of the front lever 10, an annular groove 23 is formed in the outer wall of the connecting column 22, the other end of the pull rod 3 is provided with a connecting ring 24 formed by bending, the connecting ring 24 is sleeved in the annular groove 23, an open retainer ring 25 is further arranged in the annular groove 23, and the connecting ring 24 is arranged between the open retainer ring 25 and the front lever 10.

When the presser foot mechanism works, the contact time of the presser foot 11 and the needle plate 12 is taken as the original point, the driving motor 1 drives the swing crank 2 to swing, the swing crank 2 drives the roller 16 to move from the inner side of the U-shaped sliding groove 15 to the outer side of the U-shaped sliding groove 15, the rear lever 4 swings upwards under the movement of the roller 16, the first connecting plate 13 drives the pull rod 3 to move backwards, the pull rod 3 drives the front lever 10 to move backwards and drive the presser foot 11 to move upwards, then the swing crank 2 drives the roller 16 to move from the outer side of the U-shaped sliding groove 15 to the inner side of the U-shaped sliding groove 15, the rear lever 4 swings downwards under the movement of the roller 16, the first connecting plate 13 drives the pull rod 3 to move forwards, the pull rod 3 drives the front lever 10 to move forwards and drive the presser foot 11 to move.

In short, the above description is only a preferred embodiment of the present invention, and all the equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the scope of the present invention.

Claims

1. A lift presser foot device for sewing machine, its characterized in that: the swing mechanism comprises a driving motor (1), a swing crank (2) and a pull rod (3), wherein the driving motor (1) is connected with one end of the swing crank (2), a rear lever (4) connected with the swing crank (2) is arranged at the other end of the swing crank (2), the rear lever (4) is connected with one end of the pull rod (3), a front lever (10) connected with the pull rod (3) is arranged at the other end of the pull rod (3), and a presser foot (11) connected with the front lever (10) is arranged on the front lever (10).

2. The presser foot lifting device for sewing machine according to claim 1, wherein: rear lever (4) include first connection piece (13) be connected with pull rod (3) and second connection piece (14) be connected with swing crank (2), first connection piece (13) set up with second connection piece (14) are perpendicular, the upper end and the pull rod (3) of first connection piece (13) pass through the screw connection, U type spout (15) have been seted up on second connection piece (14), be equipped with in U type spout (15) and swing crank (2) roller (16) of being connected, roller (16) are installed on swing crank (2) through axle position screw (17).

3. The presser foot lifting device for sewing machine according to claim 2, wherein: the first connecting piece (13) and the second connecting piece (14) are connected through a transition plate (18), and the transition plate (18) is obliquely arranged from the first connecting piece (13) to the direction far away from the swinging crank (2).

4. The presser foot lifting device for sewing machine according to claim 2, wherein: the rear lever mechanism is characterized by further comprising a rubber pad (19) arranged on the machine shell (8), a positioning sheet (21) extending towards the direction of the driving motor (1) is arranged at the lower end of the second connecting sheet (14), and the positioning sheet (21) is abutted to the rubber pad (19) when the rear lever (4) swings downwards to the rear side.

5. The presser foot lifting device for sewing machine according to claim 1, wherein: still include rear window board (5), rear window board pad (6), fixed cover (7), driving motor (1) fixed mounting is on rear window board (5), and rear window board pad (6) compresses tightly the side at rear window board (5) through fixed cover (7), is equipped with oil seal ring (9) in fixed cover (7), and oil seal ring (9) cover is established on the motor shaft of driving motor (1), and the motor shaft of driving motor (1) runs through in rear window board (5) and rear window board pad (6).

6. The presser foot lifting device for sewing machine according to claim 1, wherein: the upper end of the front lever (10) is provided with a connecting column (22) transversely extending towards one side of the front lever (10), the outer wall of the connecting column (22) is provided with an annular groove (23), the other end of the pull rod (3) is provided with a connecting ring (24) formed by bending, and the connecting ring (24) is sleeved in the annular groove (23).

7. The presser foot lifting device for sewing machine as claimed in claim 6, wherein: a split retainer ring (25) is further arranged in the annular groove (23), and a connecting ring (24) is arranged between the split retainer ring (25) and the front lever (10).

8. A sewing machine characterized by: comprising the presser foot lifting device for sewing machines as claimed in any of claims 1 to 7.