Back cushion assembly of presser foot lifting mechanism of sewing machine

Abstract

The utility model provides a back cushion assembly of a presser foot lifting mechanism of a sewing machine, and belongs to the technical field of machinery. The back cushion assembly solves the problems that a back cushion assembly of a presser foot lifting mechanism of an existing sewing machine is not high in comfort level, prone to falling off and inconvenient to disassemble and assemble. The back cushion assembly of the presser foot lifting mechanism of the sewing machine comprises a connecting base and a back cushion body arranged at one end of the connecting base in a sleeving mode, internal threads are arranged at the outer end of the connecting base, and the back cushion assembly is characterized in that a plurality of annular convex bodies are arranged on the inner end face of the back cushion body and are coaxial with the back cushion body; a spring is arranged between the inner end face of the back cushion body and the inner end of the connecting base, one end of the spring is arranged on one annular convex body in a sleeving mode, and the other end of the spring abuts against the inner end of the connecting base. The back cushion assembly of the presser foot lifting mechanism of the sewing machine has the advantages of being high in use comfort level, convenient and firm to connect and convenient to replace.

Description

Technical Field

[0001] The utility model belongs to the technical field of machinery and relates to a cushion assembly, in particular to a cushion assembly of a presser foot lifting mechanism of a sewing machine. Background Art

[0002] All flat-sewing machines are equipped with a sewing machine presser foot, which is an indispensable component in the feeding mechanism of the flat-sewing machine. When it is necessary to sew the sewing material to change sides, the sewing machine presser foot needs to be lifted, and the user can lift the sewing machine presser foot by pushing the knee-controlled foot lifter outward with his legs. When the knee-controlled foot lifter is released, the knee-controlled foot lifter will rebound inward, and then the sewing machine presser foot will fall. In order to improve the comfort of the user when pushing the knee-controlled foot lifter with his legs, a cushion is often fixed to the knee-controlled foot lifter by bolts, so that when it is necessary to lift the sewing machine presser foot, the knee-controlled foot lifter can be pushed outward by the cushion. At the same time, the height at which the cushion is installed on the knee-controlled foot lifter can be adjusted according to the user's height and usage habits.

[0003] For example, a presser foot lifting mechanism for an overlock sewing machine disclosed in a Chinese patent document (application number: 201320448549.8) includes a presser foot lifting lever and a fixing frame, wherein the presser foot lifting lever is pivotally connected to the overlock sewing machine body, the fixing frame is fixed to the overlock sewing machine body, a through hole is provided on the fixing frame, a rotating shaft that can rotate around its own axis is inserted into the through hole, the presser foot lifting mechanism also includes a conversion lever and a chain hook, the inner end of the conversion lever is fixed to the inner end of the rotating shaft, the lower end of the chain hook is hooked to the outer end of the conversion lever, the upper end of the chain hook is hooked to the presser foot lifting lever, and a knee-controlled lever that can drive the rotating shaft to rotate is also provided at the outer end of the rotating shaft, and a cushion for the operator's knee to touch is fixed on the knee-controlled lever. However, the cushion is directly connected to the knee-controlled lever, so it is not comfortable to use, is easy to fall off, and is inconvenient to disassemble and assemble. Summary of the Invention

[0004] The purpose of the utility model is to solve the above problems in the existing technology and to provide a cushion assembly for the presser foot lifting mechanism of a sewing machine, which has high comfort in use, is convenient and firm to connect and is easy to replace.

[0005] The purpose of the utility model can be achieved through the following technical solutions: the cushion assembly of the presser foot lifting mechanism of the sewing machine includes a connecting seat and a cushion body mounted on one end of the connecting seat, the outer end of the connecting seat has an internal thread, and is characterized in that the inner end surface of the cushion body is provided with a plurality of annular protrusions and the annular protrusions are coaxially arranged with the cushion body, a spring is provided between the inner end surface of the cushion body and the inner end of the connecting seat, and one end of the spring is mounted on one of the annular protrusions, and the other end of the spring rests on the inner end of the connecting seat.

[0006] Since a spring is provided between the inner end surface of the cushion body and the connecting seat, one end of the spring is sleeved on the annular convex body, and the other end thereof rests against the inner end of the connecting seat, which has a buffering effect, making the cushion assembly practical and comfortable. The connecting seat is connected to the knee control lean rod through a threaded structure, which has the advantages of convenient and firm connection and easy replacement.

[0007] In the aforementioned cushion assembly of the presser foot lifting mechanism of a sewing machine, an annular groove is formed on the inner sidewall of the outer end of the cushion body, and a positioning projection is formed on the outer sidewall of one end of the connecting base, and the positioning projection is embedded in the annular groove. With the positioning projection embedded in the annular groove, the cushion body is clamped to the connecting base, providing the advantages of a secure connection and easy assembly and disassembly.

[0008] In the aforementioned back cushion assembly of the presser foot lifting mechanism of a sewing machine, a snap-fit groove is formed on the outer wall of the back cushion body. The snap-fit groove is located outside the annular groove, and a clamping ring is secured within the snap-fit groove. The clamping ring is secured within the snap-fit groove, securing the back cushion body to the connecting seat, thereby providing a secure connection and easy assembly and disassembly.

[0009] In the above-mentioned cushion assembly of the presser foot lifting mechanism of the sewing machine, the heights of the annular protrusions are all the same.

[0010] In the cushion assembly of the presser foot lifting mechanism of the sewing machine, the cushion body is made of rubber material. The cushion body is made of rubber material, which makes the cushion assembly have good elasticity, good oxidation resistance and high aging resistance, thereby increasing the service life.

[0011] In the cushion assembly of the presser foot lifting mechanism of the sewing machine, the outer end surface of the cushion body is an outwardly convex arc surface. The outer end surface of the cushion body is the above-mentioned arc surface, which has the advantages of comfortable use and long service life.

[0012] In the above-mentioned cushion assembly of the presser foot lifting mechanism of the sewing machine, the outer side wall of the cushion body is a smooth surface.

[0013] Compared with the prior art, the cushion assembly of the presser foot lifting mechanism of the sewing machine has the following advantages:

[0014] 1. Since a spring is provided between the inner end surface of the cushion body and the connecting seat, one end of the spring is sleeved on the annular convex body, and the other end thereof abuts against the inner end of the connecting seat, which has a buffering effect and makes the cushion assembly practical and comfortable; 2.

[0015] 2. The connecting seat is connected to the knee control lever through a threaded structure, which has the advantages of convenient and firm connection and easy replacement;

[0016] 3. The cushion body is clamped on the connecting seat by embedding the positioning protrusion in the annular groove, which has the advantages of firm connection and easy assembly and disassembly;

[0017] 4. The cushion body is clamped to the connecting seat by the clamping ring arranged in the clamping groove, which has the advantages of firm connection and easy assembly and disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional schematic diagram of a cushion assembly of the presser foot lifting mechanism of the sewing machine.

[0019] Figure 2 It is a schematic front view of a cushion assembly of the presser foot lifting mechanism of the sewing machine.

[0020] Figure 3 It is a cross-sectional schematic diagram of a cushion assembly of the presser foot lifting mechanism of the sewing machine.

[0021] In the figure, 1, connecting seat; 1a, internal thread; 1b, positioning protrusion; 2, cushion body; 2a, annular protrusion; 2b, annular groove; 2c, clamping groove; 3, spring; 4, clamping ring. DETAILED DESCRIPTION

[0022] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0023] like Figures 1 to 3 As shown, the cushion assembly of the presser foot lifting mechanism of the sewing machine includes a connecting seat 1 and a cushion body 2 mounted on one end of the connecting seat 1. The outer end of the connecting seat 1 has an internal thread 1a, and the inner end surface of the cushion body 2 is provided with a plurality of annular protrusions 2a. The annular protrusions 2a are coaxially arranged with the cushion body 2, and the heights of the annular protrusions 2a are all the same.

[0024] A spring 3 is provided between the inner end surface of the cushion body 2 and the inner end of the connecting seat 1 , and one end of the spring 3 is sleeved on one of the annular protrusions 2 a , while the other end of the spring 3 rests against the inner end of the connecting seat 1 .

[0025] An annular groove 2b is formed on the inner sidewall of the outer end of the cushion body 2. A positioning projection 1b is formed on the outer sidewall of the upper end of the connecting base 1 and is embedded in the annular groove 2b. This allows the cushion body 2 to be securely connected to the connecting base 1, providing both a secure connection and easy assembly and disassembly. A retaining groove 2c is formed on the outer sidewall of the cushion body 2, located outside the annular groove 2b. A retaining ring 4 is secured within the retaining groove 2c.

[0026] The cushion body 2 is made of rubber, which gives the cushion assembly excellent elasticity, good oxidation resistance, and high aging resistance, thereby extending its service life. The outer end surface of the cushion body 2 is an outwardly convex curved surface, and the outer side wall of the cushion body 2 is a smooth surface, which provides the advantages of comfortable use and long service life.

[0027] A spring 3 is provided between the inner end surface of the cushion body 2 and the connecting base 1. One end of the spring 3 is sleeved on the annular protrusion 2a, and the other end abuts the inner end of the connecting base 1, providing a cushioning effect. This makes the cushion assembly practical and comfortable. The connecting base 1 is connected to the knee control lever via a threaded structure, providing a convenient and secure connection and ease of replacement. The cushion body 2 is secured to the connecting base 1 by a collar 4 secured in the connecting groove 2c, providing a secure connection and easy assembly and disassembly.

[0028] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0029] Although this document frequently uses terms such as connection base 1, internal thread 1a, positioning projection 1b, cushion body 2, annular projection 2a, annular groove 2b, engaging groove 2c, spring 3, and retaining ring 4, the use of other terms is not excluded. These terms are used solely to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations would be contrary to the spirit of the present invention.

Claims

1. A cushion assembly of a presser foot lifting mechanism of a sewing machine, comprising a connecting seat (1) and a cushion body (2) sleeved on one end of the connecting seat (1), wherein the outer end of the connecting seat (1) has an internal thread (1a), and is characterized in that: The inner end surface of the cushion body (2) is provided with a plurality of annular protrusions (2a), and the annular protrusions (2a) are coaxially arranged with the cushion body (2). A spring (3) is provided between the inner end surface of the cushion body (2) and the inner end of the connecting seat (1), and one end of the spring (3) is sleeved on one of the annular protrusions (2a), and the other end of the spring (3) is against the inner end of the connecting seat (1).

2. The cushion assembly of the presser foot lifting mechanism of a sewing machine according to claim 1, characterized in that: The inner side wall of the outer end of the cushion body (2) is provided with an annular groove (2b), and the outer side wall of one end of the connecting seat (1) is provided with a positioning protrusion (1b) and the positioning protrusion (1b) is embedded in the annular groove (2b).

3. The cushion assembly of the presser foot lifting mechanism of a sewing machine according to claim 2, characterized in that: The outer wall ring of the cushion body (2) is provided with a clamping groove (2c), the clamping groove (2c) is located outside the annular groove (2b), and a clamping ring (4) is clamped in the clamping groove (2c).

4. The cushion assembly of the presser foot lifting mechanism of a sewing machine according to claim 1, 2 or 3, characterized in that: The heights of the annular convex bodies (2a) are all the same.

5. The cushion assembly of the presser foot lifting mechanism of a sewing machine according to claim 1, 2 or 3, characterized in that: The cushion body (2) is made of rubber material.

6. The cushion assembly of the presser foot lifting mechanism of a sewing machine according to claim 1, 2 or 3, characterized in that: The outer end surface of the cushion body (2) is an outwardly convex arc surface.

7. The cushion assembly of the presser foot lifting mechanism of a sewing machine according to claim 1, 2 or 3, characterized in that: The outer side wall of the cushion body (2) is smooth.

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