Flexible connection automatic presser foot lifting device

Abstract

The utility model discloses a flexible connection automatic presser foot lifting device which comprises a presser foot vertical rod capable of moving up and down, and an electromagnet and a first crank capable of rotating are installed in a sewing machine shell. A buffer block is mounted on a driving rod of the electromagnet; the first crank is provided with a first driving handle and a second driving handle, an integrally connected long pressing plate is arranged at the end part of the first driving handle, and the long pressing plate is positioned above the buffer block; the knee-controlled connecting rod is rotationally connected with the first driving handle; the second driving handle is connected with a first connecting rod used for driving the presser foot vertical rod. The knee-controlled connecting rod is connected with the first crank, so that the aim of lifting the presser foot can be fulfilled. The electromagnet driving mode and the manual driving mode can be parallel and do not influence each other.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing technology of flat sewing machines, in particular to a soft connection 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 the effect is that the two threads are parallel to each other and regular and beautiful. This product can greatly improve work efficiency and is an indispensable machine in industries such as clothing making

[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 (14) 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 (14) abuts against the lower end part of the driver. There are certain defects in the disclosed content of this patent. The current patent content only provides a way of automatically lifting the presser foot. When the driver stops working, the presser foot lifting device cannot operate to lift the presser foot. In addition, during the operation of the driver, the specific implementation of manual operation is not mentioned Summary of the Invention

[0004] The utility model aims at the above technical problems and provides a soft connection presser foot lifting structure, which optimizes the transmission structure of the sewing machine and combines two methods of manual and electric drive to realize the function of lifting and lowering the presser foot

[0005] The technical solution adopted by the utility model to solve the above technical problems is: a soft connection automatic presser foot lifting device, including a presser foot vertical rod capable of lifting and lowering, an electromagnet and a rotatable first crank are installed in the sewing machine housing; a buffer block is installed on the driving rod of the electromagnet; the first crank has a first driving handle and a second driving handle, and a long pressing plate is integrally formed at the end of the first driving handle. The long pressing plate is located above the buffer block; the knee control connecting rod is rotatably connected to the first driving handle; the second driving handle is connected to a first connecting rod for driving the presser foot vertical rod

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

[0007] A rotatable second crank is installed in the sewing machine head through a second rotating shaft. The second crank has a third driving handle and a fourth driving handle; the third driving handle is connected to the second driving handle through a first connecting rod, and the fourth driving handle cooperates with the presser foot vertical rod

[0008] The upper edge of the above-mentioned fourth driving handle is provided with a convex body part, and the presser foot vertical rod is fixed with an abutting part, and the convex body part is located below the abutting part.

[0009] A rotatable manual knob is provided below the above-mentioned fourth driving handle. The manual knob is connected to the driving cam through a connecting shaft, and the driving cam is matched with the lower edge of the fourth driving handle.

[0010] Compared with the prior art, the soft-connection automatic presser foot lifting device of the present invention is provided with a knee control link connected to the first crank, and the purpose of lifting the presser foot can be achieved. The electromagnetic drive and manual modes can run in parallel without affecting each other. Description of the Drawings

[0011] Figure 1 is a three-dimensional structural schematic diagram of this embodiment.

[0012] Figure 2 is the front view of this embodiment.

[0013] Figure 3 is Figure 2 the right view of. Detailed Embodiment

[0014] The following further describes the embodiments of the present invention in detail with reference to the drawings.

[0015] Figures 1 to 3 The structural schematic diagram of the present invention is shown.

[0016] The reference numerals therein are: electromagnetic iron 1, mounting bracket 2, buffer block 3, long pressing plate 5c, first crank 5, first driving handle 5a, second driving handle 5b, first rotating shaft 6, knee control link 7, first link 8, second crank 9, third driving handle 9a, fourth driving handle 9b, second rotating shaft 10, manual knob 11, connecting shaft 12, driving cam 13, abutting part 14, presser foot vertical rod 15.

[0017] The automatic presser foot lifting device of the present invention includes an electromagnetic iron 1, a first crank 5, a second crank 9 and a presser foot vertical rod 15. The movement of the first crank 5 is automatically controlled by the electromagnetic iron 1 to drive the movement of the second crank 9 and lift the presser foot vertical rod 15. In addition, the first crank 5 is connected with a knee control link 7, and the presser foot can be lifted by knee control; the second crank 9 is connected with a manual knob 11, and the presser foot can be lifted manually.

[0018] As Figure 1As shown in the figure, the electromagnet 1 is fixed inside the sewing machine case through the mounting bracket 2, and the buffer block 3 is mounted on the driving rod of the electromagnet 1. The first crank 5 is rotatably mounted inside the sewing machine head through the first rotating shaft 6. The first crank 5 has a first driving handle 5a and a second driving handle 5b. The end of the first driving handle 5a is integrally connected with a long pressing plate 5c, and the long pressing plate 5c is located above the buffer block 3. The knee control link 7 is rotatably connected to the first driving handle 5a. Both the electromagnet 1 and the knee control link 7 can control the rotation of the first crank 5 through the first driving handle 5a.

[0019] When the electric control raises and lowers the presser foot, the electromagnet 1 drives the buffer block 3 to move upward. The buffer block 3 contacts the long pressing plate 5c, and the long pressing plate 5c is lifted upward, driving the first driving handle 5a to rotate the second crank 9. The buffer block 3 is made of polyurethane material, which can reduce the noise during the driving process of the electromagnet 1. When manually raising and lowering the presser foot, the buffer block 3 is in the lower stroke state, and the buffer block 3 is disengaged from the long pressing plate 5c. By lifting the first driving handle 5a upward through the knee control link 7, the same effect can be achieved, and they do not conflict with each other.

[0020] Inside the sewing machine head, a rotatable second crank 9 is installed through the second rotating shaft 10. The second crank 9 has a third driving handle 9a and a fourth driving handle 9b. The third driving handle 9a is connected to the second driving handle 5b through the first connecting rod 8, and the fourth driving handle 9b cooperates with the abutting part 14 in motion.

[0021] The sewing machine head is equipped with a liftable presser foot vertical rod 15. The abutting part 14 is fixedly connected to the presser foot vertical rod 15. A convex body part is provided on the upper edge of the fourth driving handle 9b. When the second crank 9 rotates, the abutting part 14 is driven to rise through the convex body part, driving the presser foot vertical rod 15 to lift. A rotatable manual knob 11 is provided below the fourth driving handle 9b. The manual knob 11 is connected to the driving cam 13 through the connecting shaft 12. The driving cam 13 cooperates with the lower edge of the fourth driving handle 9b. When the manual knob 11 rotates, the driving cam 13 rotates to drive the second crank 9 to rotate, which can also lift the presser foot.

[0022] During operation, the electromagnet 1 drives the long pressing plate 5c to drive the first crank 5 to rotate clockwise. The first crank 5 pulls the second crank 9 to move counterclockwise through the first connecting rod 8. After the abutting part 14 contacts the second crank 9, it moves upward, pulling the presser foot vertical rod 15 to lift upward, realizing the function of raising and lowering the presser foot. Manual control can be achieved by lifting the knee control link 7 upward, pulling the second crank 9 to move counterclockwise, and finally realizing the function of raising and lowering the presser foot. Manual control can also be achieved by rotating the manual knob 11 counterclockwise to realize the function of raising and lowering the presser foot.

[0023] The best embodiment of the present invention has 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 invention.

Claims

1. A soft-connected automatic presser foot lifting device, comprising a presser foot stand (15) capable of lifting and lowering movement, characterized in that: An electromagnet (1) and a rotatable first crank (5) are installed in a sewing machine housing; a driving rod of the electromagnet (1) is installed with a buffer block (3); the first crank (5) has a first driving handle (5a) and a second driving handle (5b), and the end of the first driving handle (5a) is provided with an integrally connected long pressing plate (5c), and the long pressing plate (5c) is located above the buffer block (3); a knee control connecting rod (7) is rotatably connected to the first driving handle (5a); and the second driving handle (5b) is connected to a first connecting rod (8) for driving a presser foot upright rod (15).

2. The soft-connected automatic presser foot lifting device according to claim 1 is characterized in that: A rotatable second crank (9) is installed inside the sewing machine head via a second rotating shaft (10), and the second crank (9) has a third driving handle (9a) and a fourth driving handle (9b); the third driving handle (9a) is connected to the second driving handle (5b) via a first connecting rod (8), and the fourth driving handle (9b) cooperates with a presser foot upright rod (15).

3. The soft-connected automatic presser foot lifting device according to claim 2 is characterized in that: The upper edge of the fourth driving handle (9b) is provided with a convex portion, the presser foot upright rod (15) is fixed with a supporting portion (14), and the convex portion is located below the supporting portion (14).

4. The soft-connected automatic presser foot lifting device according to claim 3 is characterized in that: A rotatable manual knob (11) is provided below the fourth driving handle (9b), and the manual knob (11) is connected to a driving cam (13) via a connecting shaft (12), and the driving cam (13) cooperates with the lower edge of the fourth driving handle (9b).

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