Automatic presser foot lifting device

Abstract

The utility model discloses an automatic presser foot lifting device which comprises a presser foot vertical rod capable of moving up and down, an electromagnet installed on the rear portion of a sewing machine head, a driving rod of the electromagnet connected with a driving block, the driving block is provided with a driving inclined face, and a pulley connecting rod used for driving the presser foot vertical rod to be lifted up is arranged in the sewing machine head. One end of the pulley connecting rod is provided with a pulley matched with the driving slope, and the other end is provided with a buffer block matched with the first crank. The driving block of the electromagnet adopts the driving inclined surface to guide the pulley connecting rod to move axially, so that the movement of the connecting rod is buffered, the friction between parts is reduced, the influence of noise is effectively improved, the parts are more wear-resistant, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing techniques of flat sewing machines, and particularly relates to an automatic presser foot lifting device. Background Art

[0002] At present, a double-needle sewing machine is a very important device in garment machinery, mainly used for processing various types of clothing. The double-needle sewing machine can sew thick materials and thin materials. The double-needle sewing machine is sewn by two needles synchronously and turning corners, and its effect is that the two threads are parallel to each other side by side, regular and beautiful. This product can greatly improve work efficiency and is an indispensable machine in industries such as clothing manufacturing.

[0003] The invention patent with the patent number 201810049402.9 discloses: a sewing machine presser foot lifting device, including a connecting rod assembly connected with a pull rod seat. One end of the connecting rod assembly is connected to the outer end of the pull rod seat, and the other end of the connecting rod assembly abuts against a driver; the connecting rod assembly at least includes a presser foot lifting connecting rod, and abutting parts and adjusting parts are respectively formed at both ends of the presser foot lifting connecting rod. One side of the adjusting part is connected with a regulator that can change the initial angle of the pull rod seat; the upper end surface of the abutting part abuts against the lower end part of the driver. There are certain defects in the disclosed content of this patent. The driver is in direct contact with the abutting part, lacking a buffer device. During operation, it will cause a certain amount of noise and also reduce the service life of the abutting part. If a material with higher hardness is used, the cost will also increase accordingly. Summary of the Invention

[0004] The utility model aims at the above technical problems and provides an automatic presser foot lifting device, which optimizes the transmission structure of the driving electromagnet, reduces transmission friction and lowers operation noise.

[0005] The technical solution adopted by the utility model to solve the above technical problems is: an automatic presser foot lifting device, including a presser foot vertical rod capable of lifting movement. An electromagnet is installed at the rear of the sewing machine head. The driving rod of the electromagnet is connected with a driving block. The driving block has a driving inclined surface. A pulley connecting rod for driving the presser foot vertical rod to lift is arranged inside the sewing machine head. One end of the pulley connecting rod is installed with a pulley cooperating with the driving inclined surface, and the other end is installed with a buffer block cooperating with a first crank.

[0006] To optimize the above technical solution, the utility model further includes the following improved technical solutions.

[0007] Grooves are formed on the above-mentioned driving inclined surface, and the pulley is in sliding cooperation with the grooves.

[0008] The pulley connecting rod is sleeved with a first spring. One end of the first spring is matched with the pulley end, and the other end is matched with the inner wall of the machine shell.

[0009] The above-mentioned first crank has a first driving handle and a second driving handle, and the buffer block is engaged with the first driving handle; inside the sewing head, a rotatable second crank is installed through a second rotating shaft. The second crank has a third driving handle, a fourth driving handle, and a fifth driving handle; the third driving handle is connected to the second driving handle through an adjusting link; the fourth driving handle is rotatably connected to the knee control link, and the fifth driving handle is connected to the third crank through a second link.

[0010] The above-mentioned adjusting link is provided with a long groove, and the mounting screw at the end of the third driving handle is fixed in the long groove.

[0011] The above-mentioned third crank is rotatably installed inside the sewing head through a third rotating shaft. The third crank has a sixth driving handle connected to the second link and a seventh driving handle for driving the presser foot vertical rod.

[0012] The above-mentioned presser foot vertical rod is fixedly connected with a abutting member; the upper edge of the seventh driving handle has a convex part that cooperates with the abutting member.

[0013] Compared with the prior art, in the automatic presser foot lifting device of the present utility model, the driving block of the electromagnet uses a driving inclined surface to guide the axial movement of the pulley link, which plays a buffering role in the link movement, slows down the friction between parts, effectively improves the influence of noise, makes the parts more wear-resistant, and increases the service life. Description of the Drawings

[0014] Figure 1 It is a schematic diagram of the overall three-dimensional structure of this embodiment.

[0015] Figure 2 It is a schematic diagram of the three-dimensional structure of this embodiment.

[0016] Figure 3 It is the front view of this embodiment. Detailed Description of the Invention

[0017] The following further describes the embodiments of the present utility model in detail with reference to the accompanying drawings.

[0018] Figures 1 to 3 The structure diagram of the present utility model is shown.

[0019] The reference numerals therein are: electromagnet 1, drive block 2, drive inclined surface 3, pulley 4, first spring 5, pulley connecting rod 6, groove 7, buffer block 8, first rotating shaft 9, first crank 10, first drive handle 10a, second drive handle 10b, adjusting connecting rod 11, second crank 12, third drive handle 12a, fourth drive handle 12b, fifth drive handle 12c, second rotating shaft 13, knee control connecting rod 14, mounting screw 15, second connecting rod 16, third crank 17, sixth drive handle 17a, seventh drive handle 17b, manual knob 18, drive cam 19, abutting member 20, second spring 21, presser foot vertical rod 22, third rotating shaft 23, connecting shaft 24, long groove 25.

[0020] The automatic presser foot lifting device of the present utility model includes an electromagnet 1, a pulley connecting rod 6, and a presser foot vertical rod 22. The axial movement of the pulley connecting rod 6 is automatically controlled by the electromagnet 1 to lift the presser foot vertical rod 22.

[0021] As Figure 1 shown, the electromagnet 1 is installed at the rear of the sewing machine head, and the drive block 2 is installed on the drive rod of the electromagnet 1. The pulley connecting rod 6 is horizontally installed inside the sewing machine head and can slide axially. One end of the pulley connecting rod 6 is installed with a pulley 4. The drive block 2 has a drive inclined surface 3, and a groove 7 is made on the drive inclined surface 3. The pulley 4 is in sliding fit with the groove 7. The other end of the pulley connecting rod 6 is installed with a buffer block 8, and the buffer block 8 is made of polyurethane material.

[0022] The electromagnet 1 can drive the drive block 2 to move up and down. During the upward movement of the drive block 2, the pulley 4 is guided by the drive inclined surface 3 to drive the pulley connecting rod 6 to move horizontally to the right. The cooperation between the drive inclined surface 3 and the pulley 4 can reduce the transmission noise.

[0023] The pulley connecting rod 6 is sleeved with a first spring 5. One end of the first spring 5 is in cooperation with the pulley 4 end, and the other end is in cooperation with the inner wall of the machine shell. After the electromagnet 1 drives the drive block 2 to descend, the pulley connecting rod 6 is driven by the first spring 5 to move horizontally to the left to reset.

[0024] A rotatable first crank 10 is installed inside the sewing machine head through a first rotating shaft 9. The first crank 10 has a first drive handle 10a and a second drive handle 10b. The buffer block 8 is located on one side of the first drive handle 10a. When the electromagnet 1 drives to lift the presser foot, the buffer block 8 can push the first drive handle 10a to make the first crank 10 rotate around the first rotating shaft 9. When the electromagnet 1 does not work, the pulley connecting rod 6 and the buffer block 8 are reset, and the buffer block 8 is disengaged from the first drive handle 10a, so that it will not interfere with the electromagnet 1 and the pulley connecting rod 6 during manual lifting of the presser foot.

[0025] Inside the sewing head, a rotatable second crank 12 is installed through a second rotating shaft 13. The second crank 12 has a third driving handle 12a, a fourth driving handle 12b, and a fifth driving handle 12c. The third driving handle 12a is connected to the second driving handle 10b of the first crank 10 through an adjusting link 11. The fourth driving handle 12b is rotatably connected to a knee control link 14, and the knee control link 14 can control the rotation of the second crank 12 through the fourth driving handle 12b. The fifth driving handle 12c is connected to a third crank 17 through a second link 16, and the presser foot lifting action is realized through the third crank 17. The third driving handle 12a and the fourth driving handle 12b are respectively controlled by an electromagnet 1 and knee control, so that the second crank 12 can realize the combination of electric-driven presser foot lifting and knee-controlled presser foot lifting.

[0026] The adjusting link 11 is provided with a long slot 25, and the mounting screw 15 at the end of the third driving handle 12a is fixed in the long slot 25. By adjusting the mounting position of the mounting screw 15 in the long slot 25, the distance between the end of the third driving handle 12a and the end of the second driving handle 10b can be adjusted, thereby adjusting the height of the presser foot lifting.

[0027] The third crank 17 is rotatably installed inside the sewing head through a third rotating shaft 23. The third crank 17 has a sixth driving handle 17a connected to the second link 16 and a seventh driving handle 17b for driving an abutting member 20.

[0028] The sewing head is installed with a liftable presser foot vertical rod 22, and the abutting member 20 is fixedly connected to the presser foot vertical rod 22. A second spring 21 is sleeved on the presser foot vertical rod 22. The upper edge of the seventh driving handle 17b has a convex part. When the third crank 17 rotates, the abutting member 20 and the presser foot vertical rod 22 are driven to rise through the convex part, lifting the presser foot.

[0029] A rotatable manual knob 18 is provided below the seventh driving handle 17b. A driving cam 19 is installed on the connecting shaft 24 of the manual knob 18, and the driving cam 19 cooperates with the lower edge of the seventh driving handle 17b. When the manual knob 18 rotates, the seventh driving handle 17b is driven to rise, lifting the presser foot.

[0030] During operation, the control system can drive the pulley link 6 to move horizontally to the right through the electromagnet 1. The first crank 10 rotates clockwise to pull the adjusting link 11 to move. The adjusting link 11 pulls the second crank 12 to rotate clockwise. The second crank 12 pulls the second link 16 to move horizontally to the left. The second link 16 pulls the third crank 17 to rotate counterclockwise. The third crank 17 contacts the abutting member 20, and the abutting member 20 moves upward, compressing the second spring 21, thereby pulling the presser foot vertical rod 22 to lift upward, realizing the presser foot lifting function. Manual control can be achieved by lifting the knee control link 14 upward, and the second link 16 moves horizontally to the left to realize the presser foot lifting function. Manual control can also be achieved by rotating the manual knob 18 counterclockwise to realize the presser foot kinetic energy.

[0031] The best embodiments of the present utility model have been illustrated, and various changes or modifications made by those of ordinary skill in the art will not depart from the scope of the present utility model.

Claims

1. An automatic presser foot lifting device, comprising a presser foot upright rod (22) capable of lifting and lowering movement, characterized in that: An electromagnet (1) is installed at the rear of the sewing machine head. The driving rod of the electromagnet (1) is connected to a driving block (2). The driving block (2) has a driving inclined surface (3). A pulley connecting rod (6) for driving a presser foot upright rod (22) to lift is arranged inside the sewing machine head. A pulley (4) matching with the driving inclined surface (3) is installed at one end of the pulley connecting rod (6), and a buffer block (8) matching with a first crank (10) is installed at the other end.

2. The automatic presser foot lifting device according to claim 1 is characterized in that: A groove (7) is formed on the driving inclined surface (3), and the pulley (4) is slidably matched with the groove (7).

3. The automatic presser foot lifting device according to claim 2 is characterized in that: The pulley connecting rod (6) is sleeved with a first spring (5), one end of the first spring (5) is matched with the end of the pulley (4), and the other end is matched with the inner wall of the casing.

4. The automatic presser foot lifting device according to claim 3 is characterized in that: The first crank (10) comprises a first driving handle (10a) and a second driving handle (10b), and the buffer block (8) cooperates with the first driving handle (10a); a second crank (12) is rotatably mounted inside the sewing machine head via a second rotating shaft (13), and the second crank (12) comprises a third driving handle (12a), a fourth driving handle (12b) and a fifth driving handle (12c); the third driving handle (12a) is connected to the second driving handle (10b) via an adjusting connecting rod (11); the fourth driving handle (12b) is rotatably connected to a knee control connecting rod (14), and the fifth driving handle (12c) is connected to the third crank (17) via a second connecting rod (16).

5. The automatic presser foot lifting device according to claim 4 is characterized in that: The adjusting connecting rod (11) is formed with a long slot (25), and the mounting screw (15) at the end of the third driving handle (12a) is fixed in the long slot (25).

6. The automatic presser foot lifting device according to claim 4 is characterized in that: The third crank (17) is rotatably mounted inside the sewing machine head via a third rotating shaft (23). The third crank (17) has a sixth driving handle (17a) connected to the second connecting rod (16) and a seventh driving handle (17b) for driving the presser foot upright rod (22).

7. The automatic presser foot lifting device according to claim 6 is characterized in that: The presser foot upright rod (22) is fixedly connected with a supporting member (20); the upper edge of the seventh driving handle (17b) has a convex portion that matches the supporting member (20).

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