CN212741752U

CN212741752U - Middle presser foot structure of sewing machine

Info

Publication number: CN212741752U
Application number: CN202020764363.3U
Authority: CN
Inventors: 胡小滨
Original assignee: Ningbo Supreme Electronic Machinery Inc
Current assignee: Supreme Intelligent Technology Co Ltd
Priority date: 2020-05-11
Filing date: 2020-05-11
Publication date: 2021-03-19
Anticipated expiration: 2030-05-11

Abstract

The utility model discloses a well presser foot structure of sewing machine, including well presser foot, presser bar, with the cam crank of sewing machine spindle connection, with the transmission crank axle of cam crank connection, with the linkage of presser bar connection. The connecting rod group comprises a first connecting rod, one end of the first connecting rod is movably connected with the presser foot rod through a second connecting rod, the other end of the first connecting rod is rotatably connected with the lifting control crankshaft, a connecting hole is formed between two ends of the first connecting rod, and the connecting hole is rotatably connected with the transmission crankshaft through a third connecting rod; the sewing machine is provided with a motor for controlling the rotation angle of the crank shaft to lift and fall.

Description

Middle presser foot structure of sewing machine

Technical Field

The utility model relates to an industrial sewing machine, specifically speaking are well presser foot structure of sewing machine.

Background

The utility model with the patent number 201220078296.5 discloses a middle presser foot driving structure of a sewing machine, which comprises a machine head and a presser foot rod connected with a presser foot, wherein a pull rod is arranged in the machine head, a first end part of the pull rod is connected with a driving mechanism, a second end part of the pull rod is connected with a lifting rod rotatably arranged in the machine head, and the middle part of the lifting rod is rotatably matched with the machine head through a supporting shaft; a rotatable connecting rod seat is arranged in the machine head, and a lifting part of the lifting rod is connected with the connecting rod seat; a triangular connecting plate is arranged on the connecting rod seat and is connected with a presser foot rod through a presser foot driving rod. In the patent technology, the pull rod extends to the tail end of the machine head from the front end of the machine head, the rising state and the falling state of the presser foot are controlled through the motor, the driving cam, the intermittent driving rod, the pull rod and the lifting rod at the tail end of the machine head, and the driving control structure has the defects of complex structure and difficult installation and maintenance due to the fact that the number of internal parts of the sewing machine head is large and the space is small.

Disclosure of Invention

The utility model aims to solve the technical problem that to above-mentioned prior art current situation, and provide a presser foot structure in sewing machine, improve in the tradition presser foot control motor and install at sewing machine head rear portion, the defect that the structure is complicated, simplify control structure.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: a middle presser foot structure of a sewing machine comprises a middle presser foot, a presser foot rod, a cam crank connected with a main shaft of the sewing machine, a transmission crank shaft connected with the cam crank, and a connecting rod group connected with the presser foot rod. The connecting rod group comprises a first connecting rod, one end of the first connecting rod is movably connected with the presser foot rod through a second connecting rod, the other end of the first connecting rod is rotatably connected with the lifting control crankshaft, a connecting hole is formed between two ends of the first connecting rod, and the connecting hole is rotatably connected with the transmission crankshaft through a third connecting rod; the sewing machine is provided with a motor for controlling the rotation angle of the crank shaft to lift and fall.

In order to optimize the technical proposal, the utility model discloses still include following modified technical proposal.

The transmission crank shaft comprises a first straight rod part, a first crank part and a second crank part, wherein the first crank part and the second crank part are positioned at two ends of the first straight rod part; the cam crank comprises an eccentric cam connected with the main shaft of the sewing machine, a sleeve part sleeved outside the eccentric cam and a third crank part connected with the sleeve part; the first crank part is rotationally connected with the third connecting rod; the second crank part is movably connected with the third crank part.

The lifting control crank shaft comprises a second straight rod part, a fourth crank part and a transmission gear, wherein the fourth crank part is positioned at one end of the second straight rod part; and a power gear meshed with the transmission gear is mounted on a power output shaft of the motor.

The power output shaft is fixedly connected with a reset crank, and the sewing machine is provided with a reset spring which applies pulling force to the reset crank to limit the stay angle of the power output shaft. The reset crank and the reset spring work in a matching way, so that the presser foot rod can still be kept in a rising state after the motor is powered off, and the use is convenient.

The reset crank comprises a tight loop part and a fifth crank part which are connected with the power output shaft, and the fifth crank part is rotationally connected with the first fixed seat through a fourth connecting rod and a fifth connecting rod; one end of the reset spring is connected with the connecting shaft of the fourth connecting rod and the fifth connecting rod, and the other end of the reset spring is connected with the second fixing seat.

The lifting control crank shaft is fixedly connected with a reset crank, and the sewing machine is provided with a reset spring which applies pulling force to the reset crank to limit the staying angle of the lifting control crank shaft.

The second straight rod part of the lifting control crank shaft is fixedly provided with a fan-shaped induction sheet, and the sewing machine is provided with a sensor for detecting the induction sheet.

The rotor of the motor is connected with an induction sheet, and the sewing machine is provided with a sensor for detecting the induction sheet.

Compared with the prior art, the utility model discloses a well presser foot structure through motor control lift control crank axle turned angle, realizes the rising and the decline of presser bar, and motor and lift control crank axle can all be installed at the front end of sewing machine head, have compact structure, control convenient advantage.

Drawings

Fig. 1 is a schematic perspective view of a stand-by state according to an embodiment of the present invention.

Fig. 2 is a front view of fig. 1.

Fig. 3 is a schematic perspective view of the presser foot of the embodiment of the present invention in a descending state.

Fig. 4 is a front view of fig. 3.

Fig. 5 is an assembled exploded view of fig. 1.

Detailed Description

Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.

Fig. 1 to 5 are schematic structural views of the present invention.

Wherein the reference numerals are: the pressure foot lever 1, the middle pressure foot 11, the cam crank 2, the eccentric cam 2a, the sleeve part 2b, the third crank part 2c, the transmission crank shaft 3, the first straight rod part 3a, the first crank part 3b, the second crank part 3c, the first connecting rod 41, the second connecting rod 42, the third connecting rod 43, the first rotating shaft 44, the second rotating shaft 45, the third rotating shaft 46, the lifting control crank shaft 5, the second straight rod part 5a, the fourth crank part 5b, the transmission gear 51, the induction sheet 52, the sensor 53, the motor 6, the power output shaft 61, the power gear 62, the reset crank 7, the tight ring part 7a, the fifth crank part 7b, the fourth connecting rod 71, the fifth connecting rod 72, the first fixing seat 73, the second fixing seat 74, the reset spring 8, the first pin shaft 91 and the second pin shaft 92.

The utility model discloses a well presser foot structure of sewing machine, including well presser foot 11, presser bar 1, with the cam crank 2 of sewing machine spindle connection, with the transmission crank axle 3 that cam crank 2 is connected, with the connecting rod group that presser bar 1 is connected.

The linkage includes a first link rod 41, one end of the first link rod 41 is movably connected with the presser bar 1 through a second link rod 42, the other end of the first link rod 41 is rotatably connected with the lift control crank shaft 5, a connecting hole is provided between both ends of the first link rod 41, and the connecting hole is rotatably connected with the transmission crank shaft 3 through a third link rod 43. The first end of the first link 41 is rotatably connected to the end of the second link 42 via a first rotating shaft 44. A second end portion of the first link 41 is rotatably connected to the fourth crank portion 5b of the lift control crank shaft 5 via a second rotating shaft 45. The mounting hole in the middle of the first link 41 is rotatably connected to the end of the third link 43 by a third rotating shaft 46. The first rotating shaft 44, the second rotating shaft 45, and the third rotating shaft 46 may be in a shaft screw structure or a pin structure.

The sewing machine is provided with a motor 6 for controlling the rotation angle of the lifting control crank shaft 5. The motor 6 controls the rotation angle of the crankshaft 5 through lifting control, the middle presser foot 11 and the presser foot rod 1 can be put down before sewing, and then the presser foot rod 1 works under the driving of a main shaft of the sewing machine; after sewing, the middle presser foot 11 and the presser foot rod 1 are lifted, so that enough space is left between the middle presser foot 11 and the needle plate, and sewing materials are convenient to replace.

The transmission crank shaft 3 includes a first straight rod portion 3a, a first crank portion 3b and a second crank portion 3c at both ends of the first straight rod portion 3 a. The cam crank 2 includes an eccentric cam 2a connected to a main shaft of the sewing machine, a sleeve portion 2b fitted around the eccentric cam 2a, and a third crank portion 2c connected to the sleeve portion 2 b.

The first crank portion 3b is rotatably connected to the third link 43 by a first pin 91, and the first crank portion 3b is formed with an elongated slot for accommodating the first pin 91. The second crank portion 3c is movably connected with the third crank portion 2c through a second pin 92, and the second crank portion 3c is provided with an elongated slot for accommodating the second pin 92. The sewing machine main shaft is inserted into the mounting hole of the eccentric cam 2a, and when the sewing machine main shaft rotates, the third crank portion 2c is driven to swing by the eccentric cam 2a and the sleeve portion 2 b. The swing of the third crank portion 2c is transmitted through the transmission crank shaft 3, the third link 43, the first link 41, and the second link 42, and converted into the up-and-down movement of the presser bar 1.

The lift control crank shaft 5 includes a second straight rod portion 5a, a fourth crank portion 5b at one end of the second straight rod portion 5a, and a transmission gear 51 at the other end of the second straight rod portion 5 a. A power gear 62 engaged with the transmission gear 51 is mounted on a power output shaft 61 of the motor 6.

As shown in fig. 1 and 2, the middle presser foot structure is in a standby state, the motor 6 drives the lifting control crank shaft 5 to rotate to a standby angle, the fourth crank portion 5b drives the second rotating shaft 45 to rotate around the third rotating shaft 46, so that the first rotating shaft 44 is lifted to a lifting position, and at this time, the middle presser foot 11 is lifted relative to a needle plate of the sewing machine, so that the sewing material is convenient to replace.

As shown in fig. 3 and 4, the middle presser foot structure is in an operating state, the motor 6 drives the lifting control crank shaft 5 to rotate to an operating angle, the fourth crank portion 5b drives the second rotating shaft 45 to rotate to an operating position, so that the position of the first rotating shaft 44 is lowered, and at this time, the cam crank 2 is driven by the main shaft of the sewing machine to drive the third rotating shaft 46 to move up and down through the third connecting rod 43, so that the middle presser foot 11 moves up and down along with the needle in the operating state.

The power output shaft 61 is fixedly connected with a reset crank 7, and the sewing machine is provided with a reset spring 8 which applies pulling force to the reset crank 7 to limit the stay angle of the power output shaft 61. After the sewing machine is powered off, the reset spring 8 applies torsion to the power output shaft 61 through the reset crank 7, so that the middle presser foot structure is kept in a standby state.

The reset crank 7 comprises a tight ring part 7a connected with the power output shaft 61 and a fifth crank part 7b, and the fifth crank part 7b is rotationally connected with a first fixed seat 73 through a fourth connecting rod 71 and a fifth connecting rod 72. One end of the return spring 8 is connected to the connecting shaft of the fourth link 71 and the fifth link 72, and the other end is connected to the second fixing base 74.

The reset crank 7 and the reset spring 8 may have another embodiment, for example, the reset crank 7 and the reset spring 8 may not act on the power output shaft 61, and selectively act on the lifting control crank shaft 5, so that the middle presser foot structure is kept in a standby state after the sewing is powered off. The lifting control crank shaft 5 can be fixedly connected with a reset crank 7, the sewing machine is provided with a reset spring 8 which applies pulling force to the reset crank 7 to limit the stop angle of the lifting control crank shaft 5, and after the motor 6 is powered off, the reset spring 8 can keep the stop angle of the lifting control crank shaft 5, so that the middle presser foot structure is in a rising state.

A fan-shaped sensing piece 52 is fixedly installed on the second straight rod part 5a of the lifting control crank shaft 5, and a sensor 53 for detecting the sensing piece 52 is arranged on the sewing machine. The sensor sheet 52 and the sensor 53 may be a grating sensor for detecting the rotation angle of the crank shaft 5. The sensor sheet 52 and the sensor 53 can also detect the rotation angle of the rotor of the motor 6.

While the preferred embodiments of the present invention have been illustrated, various changes and modifications may be made by those skilled in the art without departing from the scope of the present invention.

Claims

1. The utility model provides a presser foot structure in sewing machine, includes well presser foot (11), presser bar (1), cam crank (2) with sewing machine spindle connection, transmission crank axle (3) be connected with cam crank (2), the linkage of being connected with presser bar (1), characterized by: the connecting rod group comprises a first connecting rod (41), one end of the first connecting rod (41) is movably connected with the presser foot rod (1) through a second connecting rod (42), the other end of the first connecting rod (41) is rotatably connected with the lifting control crankshaft (5), a connecting hole is formed between two ends of the first connecting rod (41), and the connecting hole is rotatably connected with the transmission crankshaft (3) through a third connecting rod (43); the sewing machine is provided with a motor (6) for controlling the rotation angle of the lifting control crank shaft (5).

2. The middle presser foot structure of claim 1, wherein: the transmission crank shaft (3) comprises a first straight rod part (3a), a first crank part (3b) and a second crank part (3c), wherein the first crank part (3b) and the second crank part are positioned at two ends of the first straight rod part (3 a); the cam crank (2) comprises an eccentric cam (2a) connected with a main shaft of the sewing machine, a sleeve part (2b) sleeved outside the eccentric cam (2a), and a third crank part (2c) connected with the sleeve part (2 b); the first crank part (3b) is rotationally connected with the third connecting rod (43); the second crank part (3c) is movably connected with the third crank part (2 c).

3. The middle presser foot structure of claim 1, wherein: the lifting control crank shaft (5) comprises a second straight rod part (5a), a fourth crank part (5b) positioned at one end of the second straight rod part (5a), and a transmission gear (51) positioned at the other end of the second straight rod part (5 a); and a power gear (62) meshed with the transmission gear (51) is mounted on a power output shaft (61) of the motor (6).

4. The middle presser foot structure of claim 3, wherein: the power output shaft (61) is fixedly connected with a reset crank (7), and the sewing machine is provided with a reset spring (8) which applies pulling force to the reset crank (7) to limit the stay angle of the power output shaft (61).

5. The middle presser foot structure of claim 4, wherein: the reset crank (7) comprises a tight loop part (7a) and a fifth crank part (7b) which are connected with the power output shaft (61), and the fifth crank part (7b) is rotationally connected with the first fixed seat (73) through a fourth connecting rod (71) and a fifth connecting rod (72); one end of the reset spring (8) is connected with the connecting shafts of the fourth connecting rod (71) and the fifth connecting rod (72), and the other end of the reset spring is connected with the second fixed seat (74).

6. The middle presser foot structure of claim 3, wherein: the lifting control crank shaft (5) is fixedly connected with a reset crank (7), and the sewing machine is provided with a reset spring (8) which applies pulling force to the reset crank (7) to limit the stopping angle of the lifting control crank shaft (5).

7. The middle presser foot structure of claim 3, wherein: a fan-shaped induction sheet (52) is fixedly installed on a second straight rod part (5a) of the lifting control crank shaft (5), and the sewing machine is provided with a sensor (53) for detecting the induction sheet (52).

8. The middle presser foot structure of claim 1, wherein: the rotor of the motor (6) is connected with an induction sheet (52), and the sewing machine is provided with a sensor (53) for detecting the induction sheet (52).