Knee leaning mechanism of sewing machine

Abstract

The utility model provides a knee leaning mechanism of a sewing machine, and belongs to the technical field of sewing machines. The knee rest mechanism solves the problem that an existing knee rest mechanism is strenuous to use. The knee leaning mechanism of the sewing machine comprises a rear lever, an ejector rod and a knee leaning assembly which are sequentially arranged from top to bottom, the knee leaning assembly is used for jacking up the ejector rod, the rear lever is L-shaped and is composed of a front rod and a rear rod, a hinge hole is formed in the connecting position of the front rod and the rear rod in a left-right penetrating mode, and the central axis of the hinge hole is the swing axis of the rear lever; the upper end of the ejector rod is a horizontally-arranged rotating shaft part, a connecting base is fixed to the front rod, a strip-shaped block right opposite to the front end of the front rod is arranged on the connecting base, the strip-shaped block is located between the ejector rod and the front rod, and the strip-shaped block is perpendicular to the front rod. The rotating shaft part is hinged to the lower end of the strip-shaped block. The knee leaning mechanism of the sewing machine is labor-saving in use.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewing machines and relates to a knee rest mechanism of a sewing machine. Background Art

[0002] The presser foot is an important part of a sewing machine. The presser foot on an existing sewing machine includes a press rod provided on the sewing machine and a presser foot fixedly connected to the lower end of the press rod. When the sewing machine is feeding, the presser foot is pressed on the fabric; when the sewing machine is feeding and unloading, the presser foot is lifted upward. For the convenience of operation, a knee rest device is also provided in the existing sewing machine to control the lifting of the presser foot; when in use, the presser foot is lifted by manually pressing the knee against the knee rest plate and then toggling the joystick.

[0003] Existing knee-rest devices, such as a labor-saving knee-rest device, sewing machine and presser foot lifting method disclosed in the Chinese Patent Library (application number: 201910233015.5), include a controller, a knee-rest mechanism for driving a presser foot lifting mechanism to lift a presser foot assembly, a sensor for detecting a position change of the knee-rest mechanism, a presser foot spring providing a pressing force for the presser foot assembly and a driving mechanism for adjusting the compression amount of the presser foot spring, the sensor and the driving mechanism are both connected to the controller, and the controller controls the action of the driving mechanism according to the detection signal of the sensor; wherein the knee-rest mechanism includes a knee-rest plate, a joystick, a knee-control shaft and a bidirectional crank, the knee-rest plate is for the operator to lean against with his knee, one end of the joystick is connected to the knee-rest plate, the other end of the joystick is connected to one end of the knee-control shaft, the bidirectional crank is fixed to the other end of the knee-control shaft, and one end of the bidirectional crank acts on the presser foot lifting mechanism; the presser foot lifting mechanism includes a push rod and a rear lever.

[0004] In the above-mentioned knee support device, the top rod is hinged on the rear lever and close to the rotation fulcrum of the rear lever, resulting in a greater force on the knee assembly, which requires the operator to exert a greater force on the knee assembly, which is more laborious. Utility Model Content

[0005] The utility model aims to solve the above problems in the prior art and proposes a knee rest mechanism for a labor-saving sewing machine.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a sewing machine knee rest mechanism, including a rear lever, a push rod and a knee rest assembly arranged in sequence from top to bottom, and the knee rest assembly is used to lift the push rod, the rear lever is L-shaped, and the rear lever is composed of a front rod and a rear rod, and the connection between the front rod and the rear rod is penetrated by hinge holes on the left and right, and the central axis of the hinge hole is the swing axis of the rear lever, and the upper end of the push rod is a horizontally arranged shaft part, which is characterized in that a connecting seat is fixed on the front rod, and the connecting seat has a strip block arranged opposite to the front end of the front rod, the strip block is between the push rod and the front rod, and the strip block is arranged vertically with the front rod; the shaft part is hinged at the lower end of the strip block.

[0007] The upper end of the push rod is connected to a strip block arranged opposite to the front end of the front rod, so that the connection point between the push rod and the rear lever moves forward, thereby lengthening the distance between the hinge point and the hinge hole of the push rod and the strip block, greatly reducing the force of the knee assembly to lift the push rod, achieving a labor-saving effect.

[0008] In the above-mentioned sewing machine knee rest mechanism, the above-mentioned connecting seat comprises a strip-shaped seat body, the length extension directions of the seat body and the front rod are parallel, and the seat body is fixed against one side of the front rod, and the above-mentioned strip block is arranged at the bottom of the seat body. The above-mentioned design is adopted to facilitate the installation of the connecting seat.

[0009] In the above-mentioned knee rest mechanism of the sewing machine, the seat body is fixedly connected to the front rod by means of screws, and the axis of the screws extends along the thickness direction of the seat body to further facilitate the installation of the connecting seat.

[0010] In the above-mentioned sewing machine knee rest mechanism, a stopper is formed at the front end of the seat body, and there are two stoppers arranged in parallel up and down, and a guide groove whose shape and size match the front rod is formed between the two stoppers, and the front rod can be slidably inserted into the guide groove. The guide groove is provided for guiding the installation of the connecting seat, so that the connecting seat can slide smoothly to the installation position, which further facilitates assembly.

[0011] In the above-mentioned sewing machine knee rest mechanism, through holes are penetrated on the left and right sides of the lower end of the strip block, one end of the above-mentioned rotating shaft part passes through the through hole, and a stopper is formed on the outer side wall of the end of the rotating shaft part passing through the through hole, and the size of the stopper is larger than the through hole to prevent the rotating shaft part from escaping from the through hole. The above-mentioned design has the advantages of simple structure and convenient assembly under the premise of stably realizing the hinge connection between the rotating shaft part and the strip block.

[0012] In the above-mentioned sewing machine knee-rest mechanism, a conical spring is sleeved on the rotating shaft, and the two ends of the conical spring act on the strip block and the stopper respectively. The conical spring is provided to buffer the impact of the push rod with the strip block when it falls, thereby reducing working noise.

[0013] Compared with the prior art, the knee rest mechanism of the sewing machine has the following advantages:

[0014] 1. The upper end of the push rod is connected to the strip block arranged opposite to the front end of the front rod, so that the connection point between the push rod and the rear lever is moved forward, thereby lengthening the distance between the hinge point and the hinge hole of the push rod and the strip block, greatly reducing the force of the knee assembly to lift the push rod, achieving a labor-saving effect.

[0015] 2. A conical spring is provided to cushion the impact of the push rod with the bar block when it falls, thereby reducing working noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional schematic diagram of the knee rest mechanism of the sewing machine.

[0017] Figure 2 It is a schematic diagram of the connection between the top rod, the rear lever and the connecting seat.

[0018] Figure 3 It is a three-dimensional schematic diagram of the connecting seat.

[0019] In the figure, 1, rear lever; 1a, front rod; 1b, rear rod; 1c, hinge hole; 2, top rod; 2a, rotating shaft; 2b, stopper; 3, knee support assembly; 4, connecting seat; 4a, bar block; 4b, seat body; 4c, stopper; 5, screw; 6, conical spring. DETAILED DESCRIPTION

[0020] 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.

[0021] like Figure 1 As shown, the knee rest mechanism of the sewing machine comprises a rear lever 1, a push rod 2 and a knee rest assembly 3 which are arranged in sequence from top to bottom.

[0022] in,

[0023] The knee rest assembly 3 is used to lift the push rod 2. The specific structure of the knee rest assembly 3 and the connection method with the push rod 2 are both existing. For details, please refer to the labor-saving knee rest device, sewing machine and presser foot lifting method disclosed in the Chinese Patent Library (Application No.: 201910233015.5), which will not be elaborated here.

[0024] The rear lever 1 is an integrated structure and is L-shaped. The rear lever 1 is composed of a front rod 1a and a rear rod 1b. A hinge hole 1c is passed through the connection between the front rod 1a and the rear rod 1b, and the central axis of the hinge hole 1c is the swing axis of the rear lever 1. In the actual product, the front rod 1a and the rear rod 1b are both flat.

[0025] like Figure 1 and Figure 2 As shown, the upper end of the top rod 2 is a horizontally arranged shaft portion 2a, and the axis of the shaft portion 2a extends left and right. A connecting seat 4 is fixed on the front rod 1a, and the connecting seat 4 has a strip block 4a arranged directly opposite the front end of the front rod 1a. The strip block 4a is located between the top rod 2 and the front rod 1a, and the strip block 4a is arranged vertically with the front rod 1a. The shaft portion 2a is hinged at the lower end of the strip block 4a.

[0026] The upper end of the push rod 2 is connected to the strip block 4a arranged opposite the front end of the front rod 1a, so that the connection point between the push rod 2 and the rear lever 1 moves forward, thereby lengthening the distance between the hinge point of the push rod 2 and the strip block 4a and the hinge hole 1c, greatly reducing the force of the knee assembly to lift the push rod 2, achieving a labor-saving effect.

[0027] In this embodiment,

[0028] like Figures 1 to 3 As shown, the connection seat 4 is installed as follows: the connection seat 4 includes a strip-shaped seat body 4b, the length extension directions of the seat body 4b and the front rod 1a are parallel, and the seat body 4b is fixed against one side of the front rod 1a, and the strip block 4a is arranged at the bottom of the seat body 4b. Preferably, the seat body 4b is fixed to the front rod 1a by a screw 5, and the axis of the screw 5 extends along the thickness direction of the seat body 4b to further facilitate the installation of the connection seat 4. Specifically, the thickness extension directions of the seat body 4b and the front rod 1a are consistent; the seat body 4b is penetrated by a mounting hole 1 on the left and right, and the front rod 1a is correspondingly provided with a mounting hole 2, the rod of the screw 5 passes through the mounting hole 2 and the mounting hole 1 in sequence and is screwed with a nut, and the head of the screw 5 and the nut are respectively pressed tightly on the front rod 1a and the seat body 4b.

[0029] Further explanation, a stopper 4c is formed at the front end of the seat body 4b, and there are two stoppers 4c arranged in parallel up and down, and a guide groove whose shape and size match the front rod 1a is formed between the two stoppers 4c, and the front rod 1a can be slidably inserted into the guide groove. The guide groove is provided to guide the installation of the connecting seat 4, so that the connecting seat 4 can slide smoothly to the installation position, which further facilitates assembly.

[0030] The hinged connection method of the rotating shaft part 2a and the strip block 4a is as follows: through holes are passed through the left and right sides of the lower end of the strip block 4a, and one end of the rotating shaft part 2a passes through the through hole. A stopper 2b is formed on the outer wall of the end of the rotating shaft part 2a passing through the through hole. The size of the stopper 2b is larger than the through hole to limit the rotating shaft part 2a from escaping from the through hole. The above design has the advantages of simple structure and convenient assembly under the premise of stably realizing the hinged connection between the rotating shaft part 2a and the strip block 4a. Further explanation, a conical spring 6 is sleeved on the rotating shaft part 2a, and the two ends of the conical spring 6 act on the strip block 4a and the stopper 2b respectively. Preferably, the diameter of the conical spring 6 gradually increases from the stopper 2b to the strip block 4a. The conical spring 6 is provided to buffer the impact of the push rod 2 with the strip block 4a when it falls, thereby reducing the working noise.

[0031] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A sewing machine kneeling mechanism, comprising a rear lever (1), a push rod (2) and a kneeling assembly (3) arranged in sequence from top to bottom, wherein the kneeling assembly (3) is used to lift the push rod (2), the rear lever (1) is L-shaped, the rear lever (1) is composed of a front rod (1a) and a rear rod (1b), a hinge hole (1c) passes through the connection between the front rod (1a) and the rear rod (1b) on the left and right, and the central axis of the hinge hole (1c) is the swing axis of the rear lever (1), and the upper end of the push rod (2) is a horizontally arranged rotating shaft portion (2a), characterized in that: A connecting seat (4) is fixed on the front rod (1a), and a strip block (4a) is provided on the connecting seat (4) and is arranged opposite to the front end of the front rod (1a). The strip block (4a) is located between the top rod (2) and the front rod (1a), and the strip block (4a) is arranged vertically to the front rod (1a); and the rotating shaft portion (2a) is hinged at the lower end of the strip block (4a).

2. The knee rest mechanism for a sewing machine according to claim 1, characterized in that: The connecting seat (4) comprises a strip-shaped seat body (4b), the length extension directions of the seat body (4b) and the front rod (1a) are parallel, and the seat body (4b) is fixed against one side of the front rod (1a), and the strip block (4a) is arranged at the bottom of the seat body (4b).

3. The knee rest mechanism of a sewing machine according to claim 2, characterized in that: The seat body (4b) is fixedly connected to the front rod (1a) via a screw (5), and the axis of the screw (5) extends along the thickness direction of the seat body (4b).

4. The knee rest mechanism for a sewing machine according to claim 2 or 3, characterized in that: A stopper (4c) is formed at the front end of the seat body (4b), and there are two stoppers (4c) arranged in parallel up and down, and a guide groove whose shape and size match the front rod (1a) is formed between the two stoppers (4c), and the front rod (1a) can be slidably inserted into the guide groove.

5. The knee rest mechanism for a sewing machine according to claim 1, characterized in that: The lower end of the strip block (4a) is penetrated by through holes on the left and right sides, one end of the rotating shaft portion (2a) passes through the through hole, and a stopper (2b) is formed on the outer side wall of the end of the rotating shaft portion (2a) passing through the through hole, and the size of the stopper (2b) is larger than the through hole.

6. The knee rest mechanism for a sewing machine according to claim 5, characterized in that: A conical spring (6) is sleeved on the rotating shaft portion (2a), and two ends of the conical spring (6) act on the strip block (4a) and the stopper (2b) respectively.

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