Presser foot lifting mechanism of differential sewing machine

Abstract

The utility model provides a presser foot lifting mechanism of a differential sewing machine, which comprises a casing, a main presser foot structure and a feeding presser foot structure, the main presser foot structure comprises a main presser foot, a main presser foot pressing rod and a main presser foot driving block; the feeding presser foot structure comprises a feeding presser foot, a feeding presser foot pressing rod and a feeding presser foot driving block, and a presser foot driving plate and a driving structure are arranged at the corresponding positions of the lower ends of the feeding presser foot driving block and the main presser foot driving block, wherein the presser foot driving plate drives the feeding presser foot driving block to be lifted upwards and drives the main presser foot driving block to be lagged and lifted upwards, and the driving structure drives the presser foot driving plate to be lifted upwards.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a presser foot lifting mechanism of a differential sewing machine. Background Art

[0002] Existing sewing machines generally include a main presser foot for pressing the cloth and a feed presser foot for auxiliary feeding. In order to facilitate feeding, feed teeth are usually provided at the lower end of the feed presser foot. When the sewing machine stops to pick up or place the cloth, the presser foot usually needs to be lifted, and then the cloth is taken out or inserted under the presser foot. In the prior art, the main presser foot and the feed presser foot usually lift synchronously. However, since the feed teeth are provided at the lower end of the feed presser foot and the lower end face of the main presser foot is a smooth plane, the feed teeth at the lower end of the feed presser foot and the lower end face of the main presser foot are not in the same plane, and the feed teeth will protrude beyond the lower end face of the main presser foot. When picking up or placing the cloth, if the main presser foot and the feed presser foot lift synchronously, the cloth is likely to be caught on the feed teeth. Especially for differential sewing machines, thick or multi-layer cloth is usually sewn, which is likely to cause damage to the cloth and problems such as inconvenience in picking up and placing the cloth. Content of the Utility Model

[0003] In order to solve the above problems of the prior art, the utility model provides a lifting drive mechanism for the presser foot. When the presser foot is lifted, the feed presser foot lifts first before the main presser foot, and the feed teeth at the lower end of the feed presser foot will not protrude beyond the plane of the main presser foot, which is convenient for placing and picking up the cloth and is not likely to scratch the cloth.

[0004] The adopted technical solution is as follows:

[0005] A presser foot lifting mechanism of a differential sewing machine includes a machine shell, a main presser foot structure and a feed presser foot structure. The main presser foot structure includes a main presser foot, a main presser foot lever and a main presser foot drive block; the feed presser foot structure includes a feed presser foot, a feed presser foot lever and a feed presser foot drive block. At the corresponding positions at the lower ends of the feed presser foot drive block and the main presser foot drive block, there is a presser foot drive plate for driving the feed presser foot drive block to lift first and the main presser foot drive block to lift later, and a drive structure for driving the presser foot drive plate to lift.

[0006] Further, the drive structure can adopt a manual drive structure or an electric control drive structure.

[0007] Further, the drive structure includes a manual wrench rotatably provided outside the machine shell, a drive crank provided at one end of the manual wrench, and a presser foot drive lever driven by the drive crank to drive the presser foot to lift.

[0008] Further, one end of the presser foot drive lever is rotatably connected to the presser foot drive plate, and at the same time, one side surface is matched with the drive crank. The machine shell is provided with a first rotating pin and a second rotating pin for the presser foot drive lever to rotate, and a chute matched with the second rotating pin is also provided on the presser foot drive lever.

[0009] Furthermore, a connecting plate for connecting the manual wrench and the second rotating pin is also provided inside the casing.

[0010] Furthermore, the feed presser foot driving block is arranged at the upper end of the main presser foot driving block. The presser foot driving plate includes a convex block that cooperates with the feed presser foot driving block to drive the feed presser foot to lift; and a flat surface that cooperates with the main presser foot driving block to drive the main presser foot to lift laggingly.

[0011] Furthermore, a main presser foot return spring is provided at the upper end of the main presser foot lever; a feed presser foot return spring is provided at the upper end of the feed presser foot lever.

[0012] Furthermore, the main presser foot driving block is simultaneously movably sleeved outside the feed presser foot lever.

[0013] Compared with the prior art, the beneficial effects produced by the present utility model are as follows:

[0014] The present utility model provides a presser foot lifting mechanism for a differential sewing machine, including a main presser foot and a feed presser foot. A main presser foot driving block is provided on the main presser foot lever, and a feed presser foot driving block is provided on the feed presser foot lever. The presser foot driving plate is provided with a convex block that cooperates with the feed presser foot driving block and a flat surface that cooperates with the main presser foot driving block. When the presser foot driving plate lifts, the convex block part first pushes the feed presser foot driving block to lift, and then the flat surface part pushes the main presser foot driving block to lift. Therefore, the feed presser foot will lift prior to the main presser foot, and the feed teeth of the feed presser foot do not exceed the plane of the main presser foot, avoiding fabric snagging, facilitating the placement of thicker fabrics, and making it easier to place and remove the fabric during feeding and taking. Description of the Drawings

[0015] Figure 1 Schematic diagram of a partial structure of the sewing machine of the present utility model;

[0016] Figure 2 is Figure 1 an enlarged view of part a;

[0017] Figure 3 Partial side view of the sewing machine of the present utility model;

[0018] Figures 4 - 6 Schematic diagram of the presser foot lifting mechanism of the present utility model;

[0019] Among them, the main presser foot structure 1, the main presser foot 101, the main presser foot lever 102, the main presser foot driving block 103, the main presser foot return spring 104, the feeding presser foot structure 2, the feeding presser foot 201, the feeding presser foot lever 202, the feeding presser foot driving block 203, the feeding presser foot return spring 204, the presser foot driving plate 3, the convex block 301, the plane 302, the driving structure 4, the manual wrench 401, the driving crank 402, the presser foot driving lever 403, the machine housing 5, the first rotating pin 6, the second rotating pin 7, the sliding groove 8, and the connecting plate 9. Detailed implementation manner

[0020] The following further describes the present utility model in conjunction with specific embodiments.

[0021] Refer to Figures 1 - 6 , a presser foot lifting mechanism of a differential sewing machine, including a machine housing 5, a main presser foot structure 1 and a feeding presser foot structure 2. The main presser foot structure 1 includes a main presser foot 101, a main presser foot lever 102, and a main presser foot driving block 103. The feeding presser foot structure 2 includes a feeding presser foot 201, a feeding presser foot lever 202, and a feeding presser foot driving block 203. The main presser foot driving block 103 is simultaneously movably sleeved outside the feeding presser foot lever 202. At the corresponding positions at the lower ends of the feeding presser foot driving block and the main presser foot driving block, there is a presser foot driving plate 3 for driving the feeding presser foot driving block 203 to lift upward and the main presser foot driving block 103 to lift upward with a delay, and a driving structure 4 for driving the presser foot driving plate 3 to lift upward.

[0022] The driving structure 4 can adopt a manual driving structure or an electric control driving structure. In this embodiment, a manual driving is adopted. Of course, an electric drive can also be used to lift the presser foot driving plate 3.

[0023] The driving structure 4 includes a manual wrench 401 provided outside the machine housing 5, a driving crank 402 provided at one end of the manual wrench 401, and a presser foot driving lever 403 driven by the driving crank 402 to drive the presser foot to lift upward.

[0024] One end of the presser foot driving lever 403 is rotatably connected to the presser foot driving plate 3, and at the same time, one side surface is matched with the driving crank 402. The machine housing 5 is provided with a first rotating pin 6 and a second rotating pin 7 for the presser foot driving lever 403 to rotate. The presser foot driving lever 403 is also provided with a sliding groove 8 for cooperating with the second rotating pin 7. Inside the machine housing, there is also a connecting plate 9 connecting the manual wrench and the second rotating pin. The connecting plate 9 is provided to leave a certain space between the machine housing 5 and the presser foot driving lever 403, so that the presser foot driving lever 403 has a space for movement and is convenient for rotation. The sliding groove 8 plays a positioning role and can limit the rotation amplitude of the presser foot driving lever 403.

[0025] Manually turn the manual wrench 401, and the driving crank 402 will move synchronously with the manual wrench 401, pushing the presser foot driving lever 403 to rotate around the first rotating pin 6. The rotation of the presser foot driving lever 403 will drive the presser foot driving plate 3 to lift up.

[0026] The described feeding presser foot driving block 203 is arranged at the upper end of the main presser foot driving block 103. The presser foot driving plate 3 includes a convex block 301 that cooperates with the feeding presser foot driving block 203 to drive the feeding presser foot to lift up; and a flat surface 302 that cooperates with the main presser foot driving block 103 to drive the main presser foot 101 to lift up laggingly.

[0027] When the presser foot driving plate 3 lifts up, the convex block 301 will first contact the feeding presser foot driving block 203, pushing the main feeding presser foot driving block 203 to lift up. As the presser foot driving plate 3 continues to lift up, the flat surface 302 will contact the main presser foot driving block 103, driving the main presser foot driving block 103 to lift up. Therefore, the main presser foot driving block 103 will lift up lagging behind the feeding presser foot driving block 203, that is, the feeding presser foot will lift up before the main presser foot, and the feeding teeth will not exceed the plane of the main presser foot, avoiding fabric snagging. Thicker fabrics can be placed at the start, and it is easier to feed and take the fabric.

[0028] A main presser foot return spring 104 is arranged at the upper end of the main presser foot lever 102; a feeding presser foot return spring 204 is arranged at the upper end of the feeding presser foot lever 202. When the manual wrench 401 is reset, the presser foot driving plate 3 will also be reset. The main presser foot driving block and the feeding presser foot driving block are disengaged from the drive of the presser foot driving plate 3, and the main presser foot and the feeding presser foot will return to their original positions under the drive of the return springs.

[0029] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A presser foot lifting mechanism for a differential sewing machine, comprising a housing (5), a main presser foot structure (1) and a feed presser foot structure (2), wherein the main presser foot structure (1) comprises a main presser foot (101), a main presser foot pressure rod (102), and a main presser foot driving block (103); the feed presser foot structure (2) comprises a feed presser foot (201), a feed presser foot pressure rod (202), and a feed presser foot driving block (203), characterized in that: A presser foot driving plate (3) for driving the feeding presser foot driving block (203) to lift up and the main presser foot driving block (103) to lift up with a lag, and a driving structure (4) for driving the presser foot driving plate (3) to lift up are provided at the corresponding positions at the lower ends of the feeding presser foot driving block and the main presser foot driving block.

2. The presser foot lifting mechanism of a differential sewing machine as claimed in claim 1, characterized in that: The driving structure (4) may be a manual driving structure or an electric control driving structure.

3. The presser foot lifting mechanism of a differential sewing machine as claimed in claim 1, characterized in that: The driving structure (4) comprises a manual wrench (401) rotatably arranged outside the housing (5), a driving crank (402) arranged at one end of the manual wrench (401), and a presser foot driving lever (403) driven by the driving crank (402) to drive the presser foot driving plate (3) to lift the presser foot.

4. The presser foot lifting mechanism of a differential sewing machine as claimed in claim 3, characterized in that: One end of the presser foot driving lever (403) is rotatably connected to the presser foot driving plate (3), and one side thereof cooperates with the driving crank (402). The housing (5) is provided with a first rotating pin (6) and a second rotating pin (7) for rotating the presser foot driving lever (403). The presser foot driving lever (403) is also provided with a sliding groove (8) cooperating with the second rotating pin (7).

5. The presser foot lifting mechanism of a differential sewing machine as claimed in claim 4, characterized in that: A connecting plate (9) is also provided inside the housing to connect the manual wrench and the second rotating pin.

6. The presser foot lifting mechanism of a differential sewing machine as claimed in claim 1, characterized in that: The feed presser foot driving block (203) is arranged at the upper end of the main presser foot driving block (103), and the presser foot driving plate (3) comprises a protrusion (301) which cooperates with the feed presser foot driving block (203) and drives the feed presser foot to be lifted upward; and a plane (302) which cooperates with the main presser foot driving block (103) and drives the main presser foot (101) to be lifted up with a lag.

7. The presser foot lifting mechanism of a differential sewing machine as claimed in claim 1, characterized in that: A main presser foot return spring (104) is provided at the upper end of the main presser foot pressure rod (102); and a feed presser foot return spring (204) is provided at the upper end of the feed presser foot pressure rod (202).

8. The presser foot lifting mechanism of a differential sewing machine as claimed in claim 1, characterized in that: The main presser foot driving block (103) is also movably sleeved outside the feeding presser foot pressure rod (202).

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