CN111593497A

CN111593497A - Sewing machine

Info

Publication number: CN111593497A
Application number: CN202010479701.3A
Authority: CN
Inventors: 卢律何
Original assignee: Zhejiang Guanghe Sewing Machine Co ltd
Current assignee: Zhejiang Guanghe Sewing Machine Co ltd
Priority date: 2020-05-29
Filing date: 2020-05-29
Publication date: 2020-08-28

Abstract

The invention provides a sewing machine, and belongs to the technical field of sewing machines. The sewing machine solves the problems of high working noise, complex structure and complex mechanism of the existing sewing machine. This sewing machine, including the presser foot subassembly, step motor and the swing seat that is used for adjusting the gauge needle, step motor is used for the drive to lift the presser foot subassembly and accomplishes the action of lifting the pressure and drive the swing seat and accomplish the rotation swing action, be connected with on the step motor and lift the presser foot cam, it includes gauge needle stroke face and lifts presser foot stroke face to lift the presser foot cam, lift the presser foot subassembly including lifting the presser foot lever, depression bar and presser foot, the presser foot is connected in the bottom of depression bar, the one end of lifting the presser foot lever is passed through the interlock mechanism and is linked to each other with the depression bar, the other end of lifting the presser foot lever. The needle pitch and the presser foot lifting height of the sewing machine are more controllable.

Description

Sewing machine

Technical Field

The invention belongs to the technical field of sewing machines, and relates to a sewing machine.

Background

In the prior art, when a sewing machine is used, the actions of lifting a presser foot and adjusting the needle pitch are required, and in the prior art, some sewing machines generate larger noise, for example, a common sewing machine needle pitch adjusting mechanism is mostly completed by a needle pitch dial, and in the backstitch process, larger impact force is generated, so that the noise and the vibration of the whole sewing machine are caused, and the traditional structure cannot avoid the situation; some structures are separately and independently controlled, for example, a common presser foot lifting structure is driven by an electromagnet, the electromagnet is pushed to the bottom in a working state, the height of the presser foot lifting is highest, the effect of adjusting the height of the presser foot lifting cannot be realized, and meanwhile, the electromagnet generates larger impact in a height suction state and generates larger negative effects on noise and vibration of the whole machine; meanwhile, the common sewing machine presser foot lifting system adopts an electromagnet system, so that the whole mechanism is very large in size, complex in whole functional structure and high in cost, and upgrading and transformation space of the sewing machine is obstructed.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and provides a sewing machine, which aims to solve the technical problem of how to enable the needle pitch and the presser foot lifting height of the sewing machine to be more controllable.

The purpose of the invention can be realized by the following technical scheme: a sewing machine comprises a presser foot component and a swinging seat used for adjusting needle distance, and is characterized by further comprising a stepping motor, wherein the stepping motor is used for driving the presser foot lifting component to complete a pressure lifting action and driving the swinging seat to complete a rotary swinging action, a presser foot lifting cam is connected to the stepping motor and comprises a needle distance stroke surface and a presser foot lifting stroke surface, the presser foot lifting component comprises a presser foot lifting lever, a pressing rod and a presser foot, the presser foot is connected to the bottom end of the pressing rod, one end of the presser foot lifting lever is connected with the pressing rod through a linkage mechanism, and the other end of the presser foot lifting lever is used for being matched with the presser foot lifting stroke surface.

In the sewing machine, the stepping motor comprises an output shaft, the presser foot lifting cam is fixedly connected to the output shaft and located at one end close to the body of the stepping motor, and a stitch length driving handle is fixedly connected to the other end, away from the body of the stepping motor, of the output shaft and connected with the swing seat through a stitch length pull rod.

In the sewing machine, the stitch length driving handle is of an eccentric wheel structure, the output shaft is located at the center of the stitch length driving handle, and the stitch length pull rod is connected to the eccentric position of the stitch length driving handle.

In the sewing machine, the body of the stepping motor is positioned outside the shell, and the output shaft, the presser foot lifting cam and the stitch length driving handle are all positioned in the inner cavity of the shell.

In the sewing machine, the presser foot lifting cam is an end face cam, the needle pitch stroke face and the presser foot lifting stroke face are both located on one end face of the presser foot lifting cam, and the needle pitch stroke face and the presser foot lifting stroke face form an annular face together.

In the sewing machine, the presser foot lifting stroke surface is a spirally rising surface, and one end of the presser foot lifting stroke surface and one end of the needle pitch stroke surface are in smooth transition.

In the sewing machine, the bottom end of the presser foot lifting lever, which is adapted to the stroke surface of the presser foot lifting, is made into a cam contact arc surface.

In the sewing machine, a gap is formed between the cam contact arc surface and the needle pitch stroke surface.

In the sewing machine described above, the needle pitch stroke surface is a plane.

In the sewing machine, the linkage mechanism comprises a pull rod, a front lever, a lifting plate and a pressure rod guide frame, the pressure rod guide frame is fixedly connected to the pressure rod, the lifting plate is fixedly connected to the pressure rod guide frame, one end of the pull rod is hinged to one end of the pressure foot lifting lever through a pull rod screw, the other end of the pull rod is hinged to the front lever, and the front lever is hinged to the lifting plate.

Compared with the prior art, the invention has the following advantages:

1. the stitch length of the sewing machine is set by the drive of the stepping motor, so that the vibration noise is reduced, and the processes such as pattern sewing can be completed.

2. The sewing machine can effectively control the height of the pressure foot and the trimming inertia impact through the rotation angle and the rotation speed control of the stepping motor, thereby prolonging the service life of related parts.

3. The whole mechanism of the sewing machine is simpler, and an electromagnet system of a common sewing machine is simplified, so that the mechanism space is simplified to the maximum extent.

Drawings

Fig. 1 is a schematic structural view of the belt housing of the present invention.

Fig. 2 is a schematic structural view of the presser foot lifting mechanism of the present invention.

Fig. 3 is a schematic view of the connecting structure of the presser foot lifting lever and the presser foot cam in the invention.

FIG. 4 is a schematic view of the driving structure of the swing seat of the present invention.

Fig. 5 is a schematic structural view of the presser foot lifting cam of the present invention.

In the figure, 1, a housing; 2. a base plate; 3. a stepping motor; 3a, an output shaft; 4. lifting a presser foot lever; 4a, a cam contact cambered surface; 5. a pull rod; 6. a draw bar screw; 7. a needle pitch drive handle; 8. an axial screw; 9. a needle pitch pull rod; 10. a swing seat; 11. lifting a presser foot cam; 11a, a needle pitch stroke surface; 11b, lifting the stroke surface of the presser foot; 12. a front lever; 13. a pressure lever; 14. a lifting plate; 15. a compression bar guide frame; 16. and a presser foot.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

Referring to fig. 1-5, the present embodiment is a sewing machine, including a machine shell 1, a bottom plate 2, a stepping motor 3, a presser foot assembly and a swing seat 10 for adjusting a needle pitch, where the stepping motor 3 is used to drive the presser foot assembly to complete a pressing action and the swing seat 10 to complete a rotary swing action, the stepping motor 3 is connected with a presser foot lifting cam 11, the presser foot lifting cam 11 includes a needle pitch stroke surface 11a and a presser foot lifting stroke surface 11b, the presser foot lifting assembly includes a presser foot lifting lever 4, a pressure lever 13 and a presser foot 16, the presser foot 16 is connected to the bottom end of the pressure lever 13, the middle part of the presser foot lifting lever 4 is hinged to the machine shell 1 of the sewing machine through an axis screw 8, one end of the presser foot lifting lever 4 is connected to the pressure lever 13 through a linkage mechanism, and the other end of the presser foot lifting.

Further, step motor 3 includes output shaft 3a, lifts presser foot cam 11 and links firmly on output shaft 3a, and lifts presser foot cam 11 and be located the one end of being close to step motor 3 fuselage, and the other end that lies in keeping away from step motor 3 fuselage on the output shaft 3a links firmly needle pitch drive handle 7, and needle pitch drive handle 7 is connected with swing seat 10 through needle pitch pull rod 9, and swing seat 10 middle part hole site is articulated on with bottom plate 2.

Further, the needle pitch driving handle 7 is an eccentric wheel structure, the output shaft 3a is positioned at the center of the needle pitch driving handle 7, and the needle pitch pull rod 9 is connected to the eccentric position of the needle pitch driving handle 7.

Further, the body of the stepping motor 3 is positioned outside the machine shell 1, and the output shaft 3a, the presser foot lifting cam 11 and the needle pitch driving handle 7 are all positioned in the inner cavity of the machine shell 1.

Further, the presser foot lifting cam 11 is an end face cam, the needle pitch stroke surface 11a and the presser foot lifting stroke surface 11b are located on one end face of the presser foot lifting cam 11, and the needle pitch stroke surface 11a and the presser foot lifting stroke surface 11b form an annular surface together.

Further, the presser foot stroke surface 11b is a spiral rising surface, and one end of the presser foot lifting stroke surface 11b is in smooth transition with one end of the needle pitch stroke surface 11 a.

Further, the bottom end of the presser foot lifting lever 4 adapted to the presser foot lifting stroke surface 11b is made into a cam contact arc surface 4 a.

Further, there is a gap between the cam contact arc surface 4a and the needle pitch stroke surface 11 a.

Further, the needle pitch stroke surface 11a is a flat surface.

Further, the linkage mechanism comprises a pull rod 5, a front lever 12, a lifting plate 14 and a pressure rod guide frame 15, the pressure rod guide frame 15 is fixedly connected to a pressure rod 13, the lifting plate 14 is fixedly connected to the pressure rod guide frame 15, one end of the pull rod 5 is hinged to one end of the pressure foot lifting lever 4 through a pull rod screw 6, the other end of the pull rod 5 is hinged to the front lever 12, and the front lever 12 is hinged to the lifting plate 14.

The working principle of the embodiment is as follows; in the normal sewing process, the stepping motor 3 rotates to a certain position, and the cam contact arc surface 4a is positioned in the range of the needle pitch stroke surface 11a, namely, the cam contact arc surface 4a is separated from the needle pitch stroke surface 11 a. In the process of 1 stitch length stroke surface 11a stroke, the stepping motor 3 drives the stitch length driving handle 7 to rotate, the needle length pull rod 9 drives the swinging seat 10 to rotate to different positions, the different positions of the swinging seat 10 correspond to different stitch lengths of the sewing machine, and the cam contact arc surface 4a and the presser foot lifting cam 11 are in a non-contact state in the whole process. When the sewing machine receives a presser foot lifting signal, the stepping motor 3 drives the presser foot lifting cam 11 to rotate, the presser foot lifting stroke surface 11b is abutted to the cam contact arc surface 4a, the presser foot lifting lever 4 rotates anticlockwise around the axial screw 8 at the moment, and the presser foot lifting action is finally completed through the pull rod 5, the front lever 12, the lifting plate 14, the press rod guide frame 15, the press rod 13 and the presser foot 16. The height of the presser foot is determined by the rotation angle of the stepping motor 3. After the presser foot lifting action is finished, the stepping motor 3 drives the presser foot lifting cam 11 to return to the stroke area of the needle pitch stroke surface 11a and return to the set needle pitch state.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims

1. The sewing machine comprises a presser foot component and a swinging seat (10) used for adjusting the needle pitch, and is characterized by further comprising a stepping motor (3), wherein the stepping motor (3) is used for driving the presser foot component to complete the pressure lifting action and driving the swinging seat (10) to complete the rotary swinging action, a presser foot lifting cam (11) is connected to the stepping motor (3), the presser foot lifting cam (11) comprises a needle pitch stroke surface (11a) and a presser foot lifting stroke surface (11b), the presser foot lifting component comprises a presser foot lifting lever (4), a pressing rod (13) and a presser foot (16), the presser foot (16) is connected to the bottom end of the pressing rod (13), one end of the presser foot lifting lever (4) is connected with the pressing rod (13) through a linkage mechanism, and the other end of the presser foot lifting lever (4) is used for being matched with the presser foot lifting stroke surface (11 b).

2. The sewing machine according to claim 1, characterized in that the stepping motor (3) comprises an output shaft (3a), the pressure raising and pressing cam (11) is fixedly connected to the output shaft (3a), the pressure raising and pressing cam (11) is located at one end close to the body of the stepping motor (3), a needle pitch driving handle (7) is fixedly connected to the other end of the output shaft (3a) located far away from the body of the stepping motor (3), and the needle pitch driving handle (7) is connected with the swing seat (10) through a needle pitch pull rod (9).

3. Sewing machine as in claim 2, characterized in that said pitch drive shank (7) is of eccentric wheel construction, said output shaft (3a) being located in the centre of the pitch drive shank (7), said pitch tie rod (9) being connected in an eccentric position to the pitch drive shank (7).

4. Sewing machine as in claim 3, characterized in that the body of said stepping motor (3) is located outside the machine housing (1), said output shaft (3a), presser foot lifting cam (11) and gauge drive lever (7) being located in the inner cavity of the machine housing (1).

5. The sewing machine according to claim 1 or 2 or 3 or 4, characterized in that the presser foot lifting cam (11) is an end face cam, the needle pitch stroke surface (11a) and the presser foot lifting stroke surface (11b) are located together on one end face of the presser foot lifting cam (11), and the needle pitch stroke surface (11a) and the presser foot lifting stroke surface (11b) together form an annular surface.

6. Sewing machine as in claim 5, characterized in that said presser foot lifting travel surface (11b) is a helicoidal rise and one of the ends of said presser foot lifting travel surface (11b) is in smooth transition with one of the ends of the needle pitch travel surface (11 a).

7. Sewing machine as in claim 6, characterized in that the bottom end of the presser foot lifting lever (4) adapted to the presser foot lifting travel surface (11b) is made as a cam contact arc (4 a).

8. Sewing machine as in claim 7, characterized in that said arc cam contact surface (4a) has a clearance from the needle gauge stroke surface (11 a).

9. Sewing machine as in claim 8, characterized in that said gauge stroke surface (11a) is plane.

10. The sewing machine according to claim 1 or 2 or 3 or 4, characterized in that the linkage mechanism comprises a pull rod (5), a front lever (12), a lifting plate (14) and a lever guide (15), the lever guide (15) is fixedly connected to a lever (13), the lifting plate (14) is fixedly connected to the lever guide (15), one end of the pull rod (5) is hinged to one end of the pressure foot lifting lever (4) through a pull rod screw (6), the other end of the pull rod (5) is hinged to the front lever (12), and the front lever (12) is hinged to the lifting plate (14).