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CN-224227390-U - Automatic stitch length adjusting and automatic presser foot lifting device of sewing machine

CN224227390UCN 224227390 UCN224227390 UCN 224227390UCN-224227390-U

Abstract

The utility model relates to the technical field of sewing equipment and discloses an automatic needle pitch adjusting and automatic presser foot lifting device of a sewing machine, which comprises a machine shell, a presser foot lifting mechanism C, a needle pitch adjusting mechanism and a presser foot assembly, wherein a motor is arranged on the machine shell, a cam is connected to a rotating shaft of the motor, one end of the presser foot lifting mechanism C is a presser foot lifting roller, the other end of the presser foot lifting mechanism C is a presser foot lifting plate, the presser foot lifting roller is arranged above the cam and is in contact with the cam, the presser foot lifting plate is connected with the presser foot assembly, one end of the needle pitch adjusting mechanism is provided with an eccentric wheel, the eccentric wheel is arranged on the rotating shaft of the motor, and the other end of the needle pitch adjusting mechanism is connected with a feeding crank. The utility model can realize the automatic needle pitch adjustment and automatic presser foot lifting actions of the sewing machine through motor driving, can adjust the needle pitch of the stitch of the sewing machine through setting the rotating angle of the motor, and can make the sound small and soft when the presser foot is automatically lifted and placed through setting the rotating speed of the motor, so that the structure of the sewing machine is more compact and the cost is lower.

Inventors

  • FANG SHENGHUA
  • LUO WENXING

Assignees

  • 上海富山精密机械科技有限公司

Dates

Publication Date
20260512
Application Date
20250528

Claims (7)

  1. 1. The utility model provides an automatically regulated needle pitch of sewing machine and automatic presser foot device that lifts, its characterized in that, including casing (1), lift presser foot mechanism C, needle pitch adjustment mechanism and presser foot subassembly, be equipped with motor (2) on casing (1), be connected with cam (3) in the pivot of motor (2), lift presser foot mechanism C one end is lift presser foot gyro wheel (4), and the other end is presser foot lifter plate (16), lift presser foot gyro wheel (4) establish in cam (3) top and with cam (3) contact, presser foot lifter plate (16) are connected with the presser foot subassembly, needle pitch adjustment mechanism one end is equipped with eccentric wheel (24), eccentric wheel (24) are established in the pivot of motor (2), the needle pitch adjustment mechanism other end is connected with pay-off crank (31).
  2. 2. The automatic needle pitch adjusting and automatic presser foot lifting device of the sewing machine according to claim 1, wherein the presser foot lifting mechanism C further comprises a presser foot lifting connecting plate (6), balls (7), a connecting plate (8), a connecting ejector rod (10), a presser foot lifting lever (11), a presser foot lifting pull rod (13), a presser foot front lever (15) and a presser foot lifting plate (16), one end of the presser foot lifting connecting plate (6) is hinged with the presser foot lifting roller (4), the balls (7) are arranged at one end, connected with the presser foot lifting roller (4), of the presser foot lifting connecting plate (6), the balls (7) are hinged with the connecting plate (8), the connecting plate (8) is in a V shape, two ends of an opening of the connecting plate are respectively hinged with the balls (7) and the connecting ejector rod (10), the other end of the connecting ejector rod (10) is hinged with the presser foot lifting lever (11), the other end of the presser foot lifting lever (11) is hinged with the presser foot lifting pull rod (13), the other end of the presser foot lifting pull rod (13) is hinged with the presser foot lifting front lever (15), the other end of the presser foot lifting lever (15) is hinged with the lifting plate (16), and the other end of the presser foot lifting lever (16) is hinged with the lifting plate (16).
  3. 3. The automatic stitch length adjusting and presser foot lifting device of the sewing machine according to claim 2, characterized in that an axle position screw (5) fixedly connected with the machine shell (1) is hinged at the rotation center of the presser connecting plate (6), the bent part of the V-shaped connecting plate (8) is the rotation center of the V-shaped connecting plate, a lever axle position screw (9) fixedly connected with the machine shell (1) is hinged at the rotation center of the V-shaped connecting plate, a lever threaded pin (12) fixedly connected with the machine shell (1) is hinged at the rotation center of the presser lever (11), and a front lever threaded pin (14) fixedly connected with the machine shell (1) is hinged at the rotation center of the presser foot lifting front lever (15).
  4. 4. The automatic stitch length adjusting and automatic presser foot lifting device of a sewing machine according to claim 2, characterized in that the cam (3) is composed of a circular arc section concentric with the rotation center of the cam (3), a parabolic section, and a curved surface section connecting the circular arc section and the parabolic section.
  5. 5. The automatic stitch length adjusting and automatic presser foot lifting device of the sewing machine according to claim 2, wherein the presser foot assembly comprises a presser bar guide frame (17), a presser bar (19), a movable presser foot component (20), a presser bar shaft sleeve (18), a pressure adjusting spring (22) and a pressure adjusting screw (23), the presser bar guide frame (17) is connected with a presser foot lifting plate (16), one end of the presser bar (19) is connected with the presser bar guide frame (17), the other end of the presser bar (19) passes through the presser bar shaft sleeve (18) to be connected with the movable presser foot component (20), the presser bar shaft sleeve (18) is fixed on a machine shell (1), the presser bar (19) can slide along the presser bar shaft sleeve (18), the lower end of the pressure adjusting spring (22) is connected with the upper end of the presser bar (19), the upper end of the pressure adjusting spring (22) is connected with a pressure adjusting screw (23), the upper end of the pressure adjusting screw (23) is fixed on the machine shell (1), and the pressure adjusting spring (22) is in a pressed state.
  6. 6. The automatic stitch length adjusting and automatic presser foot lifting device of a sewing machine according to claim 5, characterized in that the movable presser foot member (20) is provided with a finger guard (21).
  7. 7. The automatic stitch length adjusting and presser foot lifting device of a sewing machine according to claim 1, characterized in that an eccentric connecting rod (25) is hinged below the eccentric wheel (24), a swinging plate seat (26) is hinged below the eccentric connecting rod (25), a swinging plate seat pin (27) connected to the machine shell (1) is hinged at the rotation center of the swinging plate seat (26), the other end of the swinging plate seat (26) is hinged with a feeding short swinging plate (28) through a first connecting pin (32), the other end of the feeding short swinging plate (28) is hinged with a feeding connecting rod (29) and a feeding long swinging plate (30) through a second connecting pin (33), a feeding motor is connected to the other end of the feeding connecting rod (29), and the other end of the feeding long swinging plate (30) is hinged with a feeding crank (31).

Description

Automatic stitch length adjusting and automatic presser foot lifting device of sewing machine Technical Field The utility model relates to the technical field of sewing equipment, in particular to an automatic stitch length adjusting and automatic presser foot lifting device of a sewing machine. Background The existing sewing machine mostly adopts an electromagnet as a power source, an electromagnet is respectively required for controlling the needle pitch adjustment and the automatic presser foot lifting, the needle pitch adjustment is carried out through a telescopic driving needle pitch adjustment mechanism of an electromagnet core when the needle pitch is adjusted, the presser foot lifting mechanism is driven by the telescopic driving of the electromagnet core to lift and release the presser foot when the presser foot is lifted automatically, and the electromagnet has the defects of unchangeable action speed and stroke, large noise and the like. In recent two years, a technology of lifting the presser foot by motor drive exists, but the function is single, the needle distance is regulated by an electromagnet, the cost is high, and the presser foot lifting needs a larger holding force, so that the presser foot lifting needs a larger power motor output, and the energy consumption is large. Disclosure of utility model The utility model aims to solve the technical problems that the existing power source for adjusting the needle pitch and lifting the presser foot is large in noise, invariable in stroke and high in cost. In order to solve the technical problems, the technical scheme of the utility model is to provide an automatic needle pitch adjusting and presser foot lifting device of a sewing machine, which comprises a machine shell, a presser foot lifting mechanism C, a needle pitch adjusting mechanism and a presser foot assembly, wherein a motor is arranged on the machine shell, a cam is connected to a rotating shaft of the motor, one end of the presser foot lifting mechanism C is a presser foot lifting roller, the other end of the presser foot lifting mechanism C is a presser foot lifting plate, the presser foot lifting roller is arranged above the cam and is in contact with the cam, the presser foot lifting plate is connected with the presser foot assembly, one end of the needle pitch adjusting mechanism is provided with an eccentric wheel, the eccentric wheel is arranged on the rotating shaft of the motor, and the other end of the needle pitch adjusting mechanism is connected with a feeding crank. Optionally, the presser foot lifting mechanism C further includes a pressing lifting connection plate, balls, a connection plate, a connection ejector rod, a pressing lifting lever, a presser foot front lifting lever and a presser foot lifting plate, one end of the pressing lifting connection plate is hinged to the pressing lifting roller, the balls are arranged at one end of the pressing lifting connection plate connected with the pressing lifting balls, the balls are hinged to the connection plate, the connection plate is in a V shape, two ends of the opening of the connection plate are respectively hinged to the balls and the connection ejector rod, the other end of the connection ejector rod is hinged to the pressing lifting lever, the other end of the pressing lifting lever is hinged to the presser foot lifting lever, the other end of the presser foot lifting lever is hinged to the presser foot front lifting lever, and the other end of the presser foot lifting plate is connected to the presser foot assembly. Optionally, the rotation center of lifting and pressing the connecting plate is articulated to have the axle position screw with casing fixed connection, the kink department of V style of calligraphy connecting plate is its rotation center, and its rotation center department articulates to have the lever axle position screw with casing fixed connection, the rotation center of lifting and pressing the lever articulates to have the lever threaded pin with casing fixed connection, the rotation center department of lifting and pressing the presser foot front lever articulates to have the preceding lever threaded pin with casing fixed connection. Optionally, the cam is composed of an arc section concentric with the rotation center of the cam, a parabolic section and a curved section connecting the arc section and the parabolic section. Optionally, the presser foot subassembly includes depression bar guide frame, depression bar, activity presser foot part, depression bar axle sleeve, pressure regulating spring and pressure regulating screw, the depression bar guide frame is connected with the presser foot lifter plate, depression bar one end is connected with the depression bar guide frame, and the other end passes the depression bar axle sleeve and is connected with activity presser foot part, the depression bar axle sleeve is fixed on the casing, the depression bar can slide along the depression bar axl