CN214992281U

CN214992281U - Swing needle cam

Info

Publication number: CN214992281U
Application number: CN202121352961.0U
Authority: CN
Inventors: 刘严杰
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-06-17
Filing date: 2021-06-17
Publication date: 2021-12-03
Anticipated expiration: 2031-06-17

Abstract

The utility model provides a swing needle cam belongs to sewing machine technical field. It has solved the poor problem of current pendulum needle cam wearability. This pendulum needle cam, including the cylindric main part that is that adopts metal material to make, the one end outside of main part outwards protrusion and the cam curved surface that forms eccentric settings, the middle part outside of main part has outside protrusion to be the annular convex shoulder of circle, the lateral part of the main part other end radially runs through threaded hole, the outside and two terminal surfaces of convex shoulder and the equal cladding in the cam curved surface outside have the wearing layer of adopting wear-resistant material to make, the joint hole has still been seted up in the main part outside, the wearing layer has the protrusion and stretches into joint portion in the joint hole. The needle swinging cam has the advantage of good wear resistance.

Description

Swing needle cam

Technical Field

The utility model belongs to the technical field of sewing machine, a pendulum needle cam is related to.

Background

The sewing machine is the most common sewing equipment used in the sewing process of clothes, and can sew the cloth together by different stitches to form a whole. Wherein, the swing needle movement of the sewing machine plays an important role in the sewing process.

For example, people have designed a buttonhole sewing machine and applied for chinese patent with the application numbers: 200920190132. X; the notice number is CN 201473726U; the buttonhole sewing machine comprises a machine shell, an upper machine shell, a machine shaft, a needle rod for installing an inner needle, a cloth feeding table with an X-Y horizontal coordinate system moving, and a curved needle below the cloth feeding table, wherein the machine shaft drives the needle rod, the needle rod makes up-and-down cloth pricking movement and forms a stitch of a buttonhole with the curved needle, a needle swinging cam is arranged at the front end part of the upper machine shell and drives a fork-shaped reciprocating rod to make up-and-down movement, the fork-shaped reciprocating rod is hinged to a swing rod mechanism through a connecting rod, the rear end of the swing rod mechanism is hinged to a shifting lever, a shifting fork on the shifting lever is hinged to a needle swinging sliding block, so that the needle swinging sliding block makes up-and-down movement, and a trapezoidal chute on the needle swinging sliding block pushes the needle rod to make horizontal movement, thereby realizing needle swinging movement.

In the needle swinging movement of the sewing machine, the needle swinging cam plays an important role, and the existing needle swinging cam is usually made of an iron material integrally, so that the needle swinging cam is heavy in weight, poor in wear resistance and oil resistance, required to be replaced frequently and high in use cost.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the above-mentioned problem that prior art exists, provide a pendulum needle cam, solved the poor problem of current pendulum needle cam wearability.

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

pendulum needle cam, including the cylindric main part that is that adopts metal material to make, the one end outside of main part outwards protrusion and the cam curved surface that forms eccentric settings, its characterized in that, the middle part outside of main part has outside protrusion to be the annular convex shoulder of circle, the lateral part of the main part other end radially runs through threaded hole, the outside and two terminal surfaces and the cam curved surface outside of convex shoulder all the cladding have the wearing layer of adopting wear-resistant material to make, the joint hole has still been seted up in the main part outside, the wearing layer has the protrusion and stretches into joint portion in the joint hole.

This pendulum needle cam covers wear-resisting layer in addition in the main part outside that metal material made, finally forms the cam structure that is fit for the size and uses in a complete set, guarantees the intensity of whole cam by the main part, and the main part outside is used for all covering wear-resisting layer with positions such as gyro wheel structure complex cam curved surface outside for improve the wearability of cam, reduce the weight and the manufacturing cost of cam. Meanwhile, the combination degree of the wear-resistant layer and the main body is further improved by the mode that the combination hole is formed in the outer side of the main body and the combination part of the wear-resistant layer extends into the combination hole, and the wear-resistant layer is prevented from falling off.

In the needle swinging cam, the combination hole penetrates through the side part of the main body, and the end part of the combination part close to the inner hole of the main body is flush with the inner wall of the main body.

In the needle swinging cam, the number of the combination holes is several and the combination holes are all arranged along the radial direction of the main body.

In the needle swinging cam, the shape and size of the outer side surface of the combining part are matched with the shape and size of the side wall of the combining hole. The joint part is tightly matched with the joint hole, so that the stability of connection between the wear-resistant layer and the main body is enhanced.

In the needle swinging cam, the end surface of the main body at one end with the cam curved surface is partially coated with the wear-resistant layer, and the part of the end surface which is not coated with the wear-resistant layer is annular.

In the needle swinging cam, the shoulder is provided with a through hole which penetrates along the axial direction of the main body.

In the needle swinging cam, the wear-resistant layer is made of polyurethane.

In the needle swinging cam, the wear-resistant layer is made of engineering plastics.

Compared with the prior art, the strength of the whole cam is ensured by the main body made of the metal material, and the outer side of the main body is used for coating the wear-resistant layer at the positions such as the outer side of the curved surface of the cam matched with the roller structure, so that the wear resistance of the cam is improved, and the weight and the production cost of the cam are reduced.

Drawings

Fig. 1 is a schematic sectional structure view of the needle swinging cam.

Fig. 2 is a schematic structural diagram of one end of the needle swinging cam with a cam curved surface.

In the figure, 1, main body; 2. a cam curved surface; 3. a shoulder is formed; 4. a threaded hole; 5. a wear layer; 6. a coupling hole; 7. a bonding section; 8. and a through hole.

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.

Example one

As shown in fig. 1 and 2, the needle swinging cam comprises a cylindrical main body 1 made of metal material, wherein the outer side of one end of the main body 1 protrudes outwards to form an eccentrically arranged cam curved surface 2, and a plurality of threaded holes 4 are radially formed in the side part of the other end of the main body 1 in a penetrating manner.

The outer side of the middle part of the main body 1 is provided with a convex shoulder 3 which protrudes outwards and is in a circular ring shape, and the convex shoulder 3 is provided with a through hole 8 which penetrates through the main body 1 along the axial direction. The outside and two terminal surfaces of convex shoulder 3 and the 2 outsides of cam curved surface all the cladding have the wearing layer 5 of adopting wear-resistant material to make, 1 lateral part of main part is radially still run through and has been seted up several and combine the hole 6, wearing layer 5 has protrusion and the one-to-one stretches into the joint portion 7 in each combines the hole 6, the shape size of the lateral surface of joint portion 7 and the shape size phase-match that combines the hole 6 lateral wall, both tight fits, the tip that the joint portion 7 is close to 1 hole of main part flushes with the inner wall of main part 1 mutually. The end surface part of the main body 1, which is provided with one end of the cam curved surface 2, is coated with the wear-resistant layer 5, and the part, which is not coated with the wear-resistant layer 5, on the end surface is in a circular ring shape. In the present embodiment, the wear-resistant layer 5 is made of polyurethane.

This pendulum needle cam covers wear-resisting layer 5 in addition in the main part 1 outside that metal material made, finally forms the cam structure that is fit for the size and uses in a complete set, guarantees the intensity of whole cam by main part 1, and the main part 1 outside is used for all covering wear-resisting layer 5 with 2 outside isopositions of gyro wheel structure complex cam curved surface for improve the wearability of cam, reduce the weight and the manufacturing cost of cam. Meanwhile, the combination degree of the wear-resistant layer 5 and the main body 1 is further improved by forming the combination hole 6 on the outer side of the main body 1 and enabling the combination part 7 of the wear-resistant layer 5 to extend into the combination hole 6, so that the wear-resistant layer 5 is prevented from falling off.

Example two

The scheme of this embodiment is substantially the same as that of the first embodiment, except that: the wear-resistant layer 5 is made of engineering plastics.

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.

Claims

1. Pendulum needle cam, including the cylindric main part (1) that is that adopts metal material to make, the one end outside of main part (1) outwards protrudes and forms eccentric cam curved surface (2) that set up, its characterized in that, the middle part outside of main part (1) has outside protrusion and is annular convex shoulder (3), the lateral part of the main part (1) other end radially runs through threaded hole (4), the outside and two terminal surfaces of convex shoulder (3) and cam curved surface (2) outside all the cladding have wearing layer (5) of adopting wear-resistant material to make, combination hole (6) have still been seted up in main part (1) outside, wearing layer (5) have the protrusion and stretch into combination portion (7) in combination hole (6).

2. The needle oscillating cam according to claim 1, characterized in that the combination hole (6) is opened through the side of the main body (1), and the end of the combination part (7) close to the inner hole of the main body (1) is flush with the inner wall of the main body (1).

3. The needle oscillating cam according to claim 1 or 2, characterized in that said coupling holes (6) are several and all open in the radial direction of said body (1).

4. The needle oscillating cam according to claim 1 or 2, characterized in that the shape and size of the outer side surface of the combining part (7) are matched with the shape and size of the side wall of the combining hole (6).

5. The needle oscillating cam according to claim 1 or 2, wherein the end surface of the main body (1) having one end of the cam curved surface (2) is partially coated with the wear-resistant layer (5), and the end surface is circular without the wear-resistant layer (5).

6. The needle oscillating cam according to claim 1 or 2, characterized in that the shoulder (3) is provided with a through hole (8) extending through the body (1) in the axial direction.

7. The needle cam according to claim 1 or 2, characterized in that the wear resistant layer (5) is made of polyurethane.

8. The needle oscillating cam according to claim 1 or 2, characterized in that the wear resistant layer (5) is made of engineering plastic.