Presser foot lifting power assisting device of sewing machine

Abstract

The utility model relates to the technical field of sewing machines, and discloses a presser foot lifting power assisting device of a sewing machine, which comprises an oil disc, a knee control shaft, an ejector rod and a presser foot lifting device, the ejector rod is vertically arranged in the oil disc in a sliding manner, the lower end of the ejector rod is fixedly connected with the presser foot lifting device, a plurality of power assisting lifting pieces which are uniformly distributed are fixedly arranged on the rod wall of the ejector rod, and the power assisting lifting pieces are arranged on the knee control shaft. The knee control shaft is longitudinally and rotatably arranged in the oil tray, an adjusting rod is fixedly arranged on the shaft wall of the knee control shaft, and a power-assisted lifting head is fixedly arranged at the end, away from the knee control shaft, of the adjusting rod. The presser foot lifting device is provided with the adjusting mechanism, so that the booster lifting height of the presser foot can be adjusted, the presser foot lifting device can be suitable for processing cloth with different thicknesses, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a device for assisting in lifting and pressing the presser foot of a sewing machine. Background Art

[0002] The presser foot of a sewing machine plays a very important role in the process of sewing fabrics. The presser foot needs to be lifted before starting sewing, when the fabric makes a large-angle turn, etc., and the height at which the presser foot needs to be lifted is different in different situations.

[0003] However, the lifting height of the presser foot of the existing sewing machine is not easy to adjust, so it cannot be adjusted according to fabrics of different thicknesses, reducing the efficiency of sewing production. For this reason, a device for assisting in lifting and pressing the presser foot of a sewing machine is proposed. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the problem that the lifting height of the presser foot of the sewing machine in the existing technology is not easy to adjust, so it cannot be adjusted according to fabrics of different thicknesses, reducing the efficiency of sewing production, and to propose a device for assisting in lifting and pressing the presser foot of a sewing machine.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A device for assisting in lifting and pressing the presser foot of a sewing machine includes an oil pan, a knee control shaft, a push rod and a presser foot. The push rod is vertically and slidably arranged inside the oil pan. The lower end of the push rod is fixedly connected to the presser foot. A plurality of uniformly distributed assisting lifting pieces are fixedly arranged on the rod wall of the push rod. The knee control shaft is longitudinally rotatably arranged inside the oil pan. An adjusting rod is fixedly arranged on the shaft wall of the knee control shaft. One end of the adjusting rod away from the knee control shaft is fixedly provided with an assisting lifting head.

[0007] Preferably, the adjusting rod includes a sleeve rod, a moving rod and a bolt. One end of the sleeve rod is fixedly connected to the shaft wall of the knee control shaft, and the other end of the sleeve rod is inserted and matched with one end of the moving rod. The end of the moving rod away from the sleeve rod is fixedly connected to the assisting lifting head. The bolt is threadedly arranged on the rod wall of the sleeve rod, and the end of the bolt abuts against the rod wall of the moving rod.

[0008] Preferably, the moving rod is a square rod, and a square groove matching the moving rod is arranged on the inner wall of the sleeve rod.

[0009] Preferably, sliding sleeves are fixedly embedded at the top and bottom of the oil pan, and the rod wall of the push rod is slidably arranged inside the two sliding sleeves.

[0010] Preferably, a limiting tray is fixedly arranged on the rod wall of the push rod and below the assisting lifting pieces.

[0011] Preferably, an opening is provided at a position corresponding to the knee control shaft on the side wall of the oil pan.

[0012] Compared with the prior art, the present utility model provides a presser foot lifting assist device for a sewing machine, having the following beneficial effects:

[0013] 1. For the presser foot lifting assist device of the sewing machine, through the provided adjusting rod, since the length of the adjusting rod is adjustable, the extending length of the assist lifting head is different, so that the assist lifting head can contact the assist lifting pieces at different positions. The longer the extending length of the assist lifting head, the higher the height that the ejector rod and the presser foot can be lifted. Conversely, the height is smaller.

[0014] 2. For the presser foot lifting assist device of the sewing machine, through the provided sleeve rod, moving rod and bolt, by loosening the bolt with a wrench, the end of the bolt is separated from the moving rod, and then the moving rod can be moved inside the sleeve rod, so that the length of the adjusting rod can be adjusted.

[0015] Parts not involved in this device are the same as or can be implemented by the prior art. The present utility model is provided with an adjusting mechanism, so that the height of the presser foot assisted lifting is adjustable, which can be applicable to the processing of fabrics with different thicknesses and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of a presser foot lifting assist device for a sewing machine proposed by the present utility model;

[0017] Figure 2 is Figure 1 a schematic structural diagram of the adjusting rod in

[0018] Figure 3 is Figure 1 a schematic external structure diagram of the oil pan in

[0019] In the figure: 1. Oil pan; 2. Knee control shaft; 3. Ejector rod; 4. Presser foot; 5. Assist lifting piece; 6. Adjusting rod; 7. Assist lifting head; 8. Sleeve rod; 9. Moving rod; 10. Bolt; 11. Sliding sleeve; 12. Limit tray; 13. Opening. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0021] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0022] Referring to Figure 1 , a presser foot lifting assist device for a sewing machine, comprising an oil pan 1, a knee control shaft 2, a push rod 3 and a presser foot 4. The push rod 3 is vertically slidably arranged inside the oil pan 1. Sliding sleeves 11 are fixedly embedded at both the top and bottom of the oil pan 1. The rod wall of the push rod 3 is slidably arranged inside the two sliding sleeves 11, enabling the push rod 3 to slide smoothly up and down inside the sliding sleeves 11. The lower end of the push rod 3 is fixedly connected to the presser foot 4. A plurality of uniformly distributed assist lifting pieces 5 are fixedly arranged on the rod wall of the push rod 3. The knee control shaft 2 is longitudinally rotatably arranged inside the oil pan 1. An adjusting rod 6 is fixedly arranged on the shaft wall of the knee control shaft 2. A assist lifting head 7 is fixedly arranged at one end of the adjusting rod 6 away from the knee control shaft 2. During the rotation of the knee control shaft 2, the adjusting rod 6 rotates, and the adjusting rod 6 can drive the assist lifting head 7 to rotate and contact the assist lifting pieces 5, thereby being able to lift the push rod 3 and the presser foot 4 upward. By adjusting the length of the adjusting rod 6, the extending length of the assist lifting head 7 is different, so that the assist lifting head 7 can contact the assist lifting pieces 5 at different positions. The longer the extending length of the assist lifting head 7, the more the assist lifting head 7 contacts the assist lifting pieces 5 near the bottom, and thus the greater the height at which the push rod 3 and the presser foot 4 can be lifted. Conversely, the height is smaller.

[0023] Referring to Figure 1-2 , the adjusting rod 6 includes a sleeve rod 8, a moving rod 9 and a bolt 10. One end of the sleeve rod 8 is fixedly connected to the shaft wall of the knee control shaft 2, and the other end of the sleeve rod 8 is inserted and matched with one end of the moving rod 9. The end of the moving rod 9 away from the sleeve rod 8 is fixedly connected to the assist lifting head 7. The bolt 10 is threadedly arranged on the rod wall of the sleeve rod 8, and the end of the bolt 10 abuts against the rod wall of the moving rod 9. The moving rod 9 is a square rod, and a square groove matching the moving rod 9 is arranged on the inner wall of the sleeve rod 8. The square structure enables the moving rod 9 not to rotate inside the sleeve rod 8. By loosening the bolt 10 with a wrench, the end of the bolt 10 is separated from the moving rod 9, and then the moving rod 9 can be moved inside the sleeve rod 8, so that the length of the adjusting rod 6 can be adjusted.

[0024] Referring to Figure 2 , a limiting tray 12 is fixedly arranged on the rod wall of the push rod 3 and below the assist lifting pieces 5. The limiting tray 12 can limit the downward movement position of the push rod 3 and the presser foot 4.

[0025] Reference Figure 1 and 3 At the side wall of the oil pan 1 and corresponding to the position of the knee control shaft 2, an opening 13 is provided. Through the opening 13, a wrench can be inserted into the interior of the oil pan 1 to adjust the length of the adjusting rod 6.

[0026] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, shall be covered by the protection scope of the present invention.

Claims

1. A presser foot lifting assist device for a sewing machine, comprising an oil pan (1), a knee control shaft (2), a push rod (3) and a presser foot lifting (4), characterized in that: The push rod (3) is vertically slidably arranged inside the oil pan (1), the lower end of the push rod (3) is fixedly connected to the presser foot (4), a plurality of evenly distributed power-assisted lifting pieces (5) are fixedly arranged on the rod wall of the push rod (3), the knee control shaft (2) is longitudinally rotatably arranged inside the oil pan (1), an adjustment rod (6) is fixedly arranged on the shaft wall of the knee control shaft (2), and a power-assisted lifting head (7) is fixedly arranged on the end of the adjustment rod (6) away from the knee control shaft (2).

2. A presser foot lifting assist device for a sewing machine according to claim 1, characterized in that: The adjusting rod (6) comprises a sleeve rod (8), a moving rod (9) and a bolt (10); one end of the sleeve rod (8) is fixedly connected to the shaft wall of the knee control shaft (2), and the other end of the sleeve rod (8) is plugged into and matched with one end of the moving rod (9); the end of the moving rod (9) away from the sleeve rod (8) is fixedly connected to the power-assisted lifting head (7); the bolt (10) is threadedly arranged on the rod wall of the sleeve rod (8), and the end of the bolt (10) is arranged to abut against the rod wall of the moving rod (9).

3. A presser foot lifting assist device for a sewing machine according to claim 2, characterized in that: The moving rod (9) is a square rod, and the inner wall of the sleeve rod (8) is provided with a square groove matching the moving rod (9).

4. The presser foot lifting assist device for a sewing machine according to claim 1, characterized in that: The top and bottom of the oil pan (1) are both fixedly embedded with sliding sleeves (11), and the rod wall of the push rod (3) is slidably arranged inside the two sliding sleeves (11).

5. The presser foot lifting assist device for a sewing machine according to claim 1, characterized in that: A limiting tray (12) is fixedly provided on the rod wall of the push rod (3) and below the auxiliary lifting piece (5).

6. The presser foot lifting assist device for a sewing machine according to claim 1, characterized in that: An opening (13) is provided on the side wall of the oil pan (1) at a position corresponding to the position of the knee control shaft (2).

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