Motor drive mechanism with a switcher swing and sewing machine

Abstract

This utility model belongs to the field of sewing machine technology, specifically relating to a motor-driven mechanism for a switcher oscillation and a sewing machine. It uses a stepper motor to control the setting of the oscillation angle and interaction value of the switcher in the inner and outer presser foot interaction mechanism, cooperating with a control system to achieve digital management of the interaction. This utility model includes a stepper motor, which drives a cam-linkage mechanism to cause the switcher to reciprocate. The switcher drives a presser foot interaction adjustment mechanism to achieve the height difference between the alternating lifting and lowering of the outer and inner presser feet. The cam-linkage mechanism includes a cam, driven by a stepper motor. A rectangular block is provided on the side of the cam link, and the working surface of the cam mates with the F-surface of the rectangular block, allowing precise control of the cam link's movement trajectory. A through hole is provided on the connecting lug, and a crank is connected to the through hole via a connecting pin. The cam link drives the crank to reciprocate.

Description

Technical Field

[0001] This utility model belongs to the field of sewing machine technology, specifically relating to a motor drive mechanism for a switcher swing and a sewing machine. Background Technology

[0002] Currently, in sewing machines with integrated feeding (presser foot, feed dog, and needle feeding simultaneously), the presser bar assembly includes an outer presser foot and an inner presser foot. The outer presser foot primarily ensures the pressure on the fabric, while the inner presser foot works in conjunction with the needle and feed dog to complete the feeding process. During feeding, the outer and inner presser feet alternate to ensure smooth feeding. The presser foot interaction is achieved in two ways: one is through a mechanical cam-driven presser foot interaction adjustment mechanism; the other is through a stepper motor-driven presser foot interaction adjustment mechanism.

[0003] The current implementation of the stepper motor-driven pressure foot interaction adjustment mechanism in existing models achieves the interaction amount by either a stepper motor driving a gear structure or a stepper motor driving an eccentric wheel toothed fork structure. The problem with this approach is:

[0004] 1. Gear structures generate significant noise, vibration, and impact during operation. High energy consumption necessitates a large transmission ratio, and the structure occupies a large space.

[0005] 2. The following problems exist with using an eccentric wheel toothed fork structure:

[0006] 1) During the movement, large inertial forces and vibrations are generated, resulting in poor movement stability of the mechanism and easy generation of large noise and energy loss.

[0007] 2) Poor synchronization and coordination make it impossible to achieve complex motion precision. Precision is greatly affected by machining and assembly clearances and wear.

[0008] 3) The direction of the force exerted by the eccentric wheel on the tooth fork groove is changing, which will generate a large lateral component force. If the lubrication is poor or the clearance is not well controlled, the tooth fork may get stuck in the groove or wear will be aggravated.

[0009] 4) If the motion characteristics need to be changed, the eccentricity of the eccentric wheel needs to be modified, and the size of the toothed fork will change accordingly. This requires a large space for structural design and the structure is not compact. Utility Model Content

[0010] This utility model provides a motor drive mechanism for a switcher swing and a sewing machine. It uses a stepper motor to control the setting of the swing angle and interaction value of the switcher in the inner and outer presser foot interaction mechanism. In conjunction with the control system, it realizes digital management of the interaction quantity and provides a clear view to the customer.

[0011] To solve the above problems, the technical solution adopted by this utility model is as follows: a motor drive mechanism for a switcher swinging, including a stepper motor, a switcher and a pressure foot interaction adjustment mechanism, and also including a cam linkage mechanism. The stepper motor drives the cam linkage mechanism to drive the switcher to swing back and forth, and the switcher drives the pressure foot interaction adjustment mechanism to realize the height difference between the alternating lifting and lowering of the outer pressure foot and the inner pressure foot.

[0012] The cam-connecting rod mechanism includes a cam, a cam connecting rod, and a crank. The cam is driven by a stepper motor. The cam connecting rod has a U-shaped structure and a connecting lug integrally formed with its bottom. A rectangular block is provided on the side of the cam connecting rod. The working surface of the cam cooperates with the F-face of the rectangular block, which can precisely control the movement trajectory of the cam connecting rod. A through hole is provided on the connecting lug. The crank is connected to the through hole through a connecting pin. The cam connecting rod drives the crank to swing back and forth.

[0013] Furthermore, the through hole is hinged to the connecting pin, and the crank is fixed to the connecting pin.

[0014] Furthermore, the switcher is fixed to the crank via the flower cutter shaft, and the stepper motor drives the cam connecting rod mechanism to work, causing the switcher to reciprocate.

[0015] A sewing machine includes a motor drive mechanism for a switcher to oscillate.

[0016] Compared with the prior art, the advantages of this utility model are:

[0017] 1) This utility model realizes the motion trajectory and timing of the switcher's swing through the interaction of the cam, cam connecting rod and crank. The cam mechanism has a compact structure and can realize motion transmission and conversion in a relatively small space, saving mechanism space. The precise design of the cam profile and the direct-drive connecting rod structure transform precise input into complex output trajectory. The switcher shaft drives the pressure foot interaction adjustment mechanism to swing at a certain angle, realizing the control of the interaction between the outer pressure foot and the inner pressure foot.

[0018] 2) The cam-driven cam connecting rod and crank of this utility model transmit motion directly, efficiently and without lag, achieving high-speed and stable operation and reducing inertial force, impact and vibration.

[0019] 3) In this utility model, the cam drives the cam connecting rod to move. Due to the special structure of the cam connecting rod,

[0020] It can achieve complex movements in a small space, making the drive mechanism design compact and saving space; it also reduces the torque requirements of the stepper motor.

[0021] 4) This utility model allows the interaction amount value to be gradually set through a stepper motor drive device, which is used to adapt to the corresponding sewing environment and is also beneficial for fine-tuning the interaction amount. When sewing thick fabric, a large interaction amount value can be set; when sewing thin fabric, a small interaction amount can be set; when sewing thin and thick fabrics alternately, both large and small interaction amounts can be set.

[0022] 5) The cam and connecting rod arc surfaces of this utility model are in line contact, which can transmit a large force in a small size and reduce the torque requirements of the stepper motor.

[0023] 6) The mechanism of this utility model is simple and easy to operate. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model.

[0025] Figure 2 This is an exploded view of the cam drive mechanism of this utility model.

[0026] Figure 3 This is a schematic diagram of the structure of the cam of this utility model.

[0027] Figure 4 This is a schematic diagram of the cam connecting rod of this utility model.

[0028] Figure 5 This is a structural schematic diagram of the utility model from another angle.

[0029] Reference numerals: 1-Stepper motor, 2-Cam, 3-Cam connecting rod, 4-Crank, 5-Connecting pin, 6-Switcher shaft, 7-Switcher, 8-Oscillating shaft, 9-Pressure foot interaction adjustment mechanism, 10-Upper shaft, 11-Eccentric cam, 12-Drive connecting rod, 13-Pressure rod assembly, 13-1-Outer pressure foot, 13-2-Inner pressure foot;

[0030] 3-1-Rectangular block, 3-2-Through hole. Detailed Implementation

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Example

[0034] A motor drive mechanism for a switch oscillation, comprising: Figures 1-5 As shown, it is used on a sewing machine and includes a stepper motor 1, a cam linkage mechanism, a switcher 7, and a presser foot interaction adjustment mechanism 9. The stepper motor 1 drives the cam linkage mechanism to drive the switcher 7 to reciprocate. The switcher 7 drives the presser foot interaction adjustment mechanism 9 to realize the height difference between the alternating lifting and lowering of the outer presser foot and the inner presser foot.

[0035] The aforementioned cam-linkage mechanism is used to control the reciprocating swing angle of the switch 7 in the presser foot interaction adjustment mechanism; it includes a cam 2, a cam link 3, a crank 4, and a connecting pin 5. The cam 2 is fixedly connected to the motor shaft of the stepper motor 1, driving the cam to move. The cam link 3 has a U-shaped structure and a connecting ear integrally set at its bottom. A rectangular block 3-1 is provided on the side of the cam link 3. The working surface of the cam 2 cooperates with the F surface of the rectangular block 3-1, which can precisely control the movement trajectory of the cam link. A through hole 3-2 is provided on the connecting ear. The crank 4 is connected to the through hole 3-2 through the connecting pin 5. The through hole 3-2 is hinged to the connecting pin 5. The crank 4 is fixedly connected to the connecting pin 5. The cam link 3 drives the crank 4 to reciprocate. The crank 4 is fixedly connected to the switching shaft 6. The switch 7 is fixedly connected to the switching shaft 6.

[0036] The aforementioned switcher 7 is a sub-component of the presser foot interaction adjustment mechanism 9. The switcher 7 is fixedly connected to the crank 4 via the cutter shaft 6. The stepper motor 1 drives the cam linkage mechanism to work, causing the switcher 7 to reciprocate.

[0037] like Figure 3 and 4 As shown, rectangular block 3-1 on the side of cam link 3 has surfaces G and F; surface E is provided on the U-shaped structure; and surfaces A, B, C, and D are provided on cam 2. Surface E on cam link 3 is hinged to surface C on cam 2, and rectangular block 3-1 on cam link 3 is integrally formed with surface E of the U-shaped structure. Surface F on cam link 3 interacts with the contour surface B on cam 2. During the interaction between surface F on cam link 3 and contour surface B on cam 2, the positions of cam link 3 and cam 2 remain in rigid contact, and no radial displacement occurs.

[0038] The D-surface on cam 2 and the G-surface of rectangular block 3-1 of cam connecting rod 3 serve as the initial positioning surfaces for the movement of cam 2. When cam 2 rotates counterclockwise, it pushes the F-surface of cam connecting rod 3 upward, and the through hole 3-2 of cam connecting rod 3 causes crank 4 to swing at a certain angle, thereby increasing the interaction amount of the presser foot; when it returns clockwise, it reduces the interaction amount of the presser foot back to the initial position.

[0039] The aforementioned presser foot adjustment mechanism 9 is connected to the presser bar assembly 13 via the swing shaft 8 and drive linkage 12. Furthermore, the presser foot adjustment mechanism 9 is connected to the upper shaft 10 via the eccentric cam of the sub-component 11, enabling the outer presser foot 13-1 and inner presser foot 13-2 in the presser foot assembly 13 to alternately lift and lower. The presser foot adjustment mechanism 9 and presser foot assembly 13 are common structures in sewing machine mechanisms and will not be elaborated upon here. The cam linkage 3 moves upward, simultaneously pushing the crank 4 to swing, causing the switch 7 to reciprocate. This, in turn, causes the outer presser foot 13-1 and inner presser foot 13-2 on the presser foot adjustment mechanism 9 and presser foot assembly 13 to alternately lift and lower.

[0040] The driving device of the cam drive mechanism of this utility model is a stepper motor, which can realize the change of the interaction between the outer pressure foot and the inner pressure foot. In conjunction with the control system and operation screen of the peripheral device, the interaction can be digitally managed.

[0041] Many specific details have been set forth in the foregoing description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed above.

[0042] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A motor drive mechanism of a switch rocker, comprising a stepping motor (1), a switch (7) and a presser foot interaction amount adjusting mechanism (9), characterized by, It also includes a cam linkage mechanism. The stepper motor (1) drives the cam linkage mechanism to drive the switch (7) to reciprocate. The switch (7) drives the pressure foot interaction adjustment mechanism (9) to realize the height difference between the alternating lifting and lowering of the outer pressure foot and the inner pressure foot. The cam linkage mechanism includes a cam (2), a cam linkage (3), and a crank (4). The cam (2) is driven by a stepper motor (1). The cam linkage (3) has a U-shaped structure and an integral connecting ear at its bottom. A rectangular block (3-1) is provided on the side of the cam linkage (3). The working surface (B) of the cam (2) cooperates with the F surface of the rectangular block (3-1), which can precisely control the movement trajectory of the cam linkage. A through hole (3-2) is provided on the connecting ear. The crank (4) is connected to the through hole (3-2) through a connecting pin (5). The cam linkage (3) drives the crank (4) to swing back and forth.

2. A motor drive mechanism for a switcher swing according to claim 1, wherein The through hole (3-2) is hinged to the connecting pin (5), and the crank (4) is fixed to the connecting pin (5).

3. A motor drive mechanism for a switcher oscillation according to claim 1 or 2, characterized in that, The switcher (7) is fixedly connected to the crank (4) via the flower cutter shaft (6), and the stepper motor (1) drives the cam linkage mechanism to work, causing the switcher (7) to swing back and forth.

4. A sewing machine, characterized in that, Includes a motor drive mechanism for switching oscillation as described in any one of claims 1-3.

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