Driving cam for sewing machine

Abstract

The utility model discloses a driving cam for a sewing machine, which comprises a driving cam, the driving cam comprises a stiff thread driving section, a presser foot lifting driving section and a pressurizing driving section, the stiff thread driving section is used for releasing the pressure of an upper thread, the presser foot lifting driving section is used for lifting a presser foot pressing rod, and the pressurizing driving section is used for pressurizing the presser foot pressing rod. The driving cam is driven by the driving motor at different rotating angles to complete the thread straightening action, the presser foot lifting action and the pressurizing action, the thread straightening action and the presser foot lifting action are sequentially achieved through forward rotation of the driving motor, and the pressurizing action is achieved through reverse rotation of the driving motor; the driving motor cannot drive the thread straightening action and the presser foot lifting action and cannot drive the pressurizing action at the same time; presser foot lifting, thread erecting and pressurizing actions are achieved through clockwise and anticlockwise rotation of the motor, the structure is simple, operation is convenient, the overall adaptability is improved, meanwhile, cost is reduced, and cost reduction and material reduction of enterprises are facilitated.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, and specifically to a drive cam for a sewing machine. Background Technology

[0002] A sewing machine is a machine that uses sewing thread to create one or more stitches on a workpiece, allowing one or more layers of workpiece to be interwoven or sewn together.

[0003] Currently, sewing machines on the market require additional power sources for lifting the presser foot, thread lifting, and applying pressure, meaning that sewing machines need at least two power sources. This not only increases the manufacturing cost of sewing machines but also makes them more difficult to control. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a drive cam for sewing machines to solve the above-mentioned problems.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a drive cam for a sewing machine, comprising a thread lifting drive section, a presser foot lifting drive section, and a pressure applying drive section. The thread lifting drive section is used to adjust the pressure on the sewing thread, the presser foot lifting drive section is used to lift and lower the presser foot lever, and the pressure applying drive section is used to apply pressure to the presser foot lever. The drive cam completes the thread lifting action, presser foot lifting action, and pressure applying action under the drive of a drive motor at different rotation angles. The drive motor rotates forward to sequentially realize the thread lifting action and presser foot lifting action, and the drive motor rotates in reverse to realize the pressure applying action. The drive motor cannot simultaneously drive the thread lifting action and the presser foot lifting action while driving the pressure applying action.

[0006] Furthermore, the driving angle range of the lead-in section is from 0° to the maximum point of the lead-in angle.

[0007] Furthermore, the driving angle range of the lifting foot drive section is from the maximum point of the upright line angle to the maximum point of the lifting foot angle.

[0008] Furthermore, the driving angle range of the pressurized drive section is from -0° to the maximum value of the pressurization angle.

[0009] The beneficial technical effects of this utility model are: the clockwise and counterclockwise rotation of a motor realizes the lifting of the pressure foot, the lifting of the wire and the pressing action. The structure is simple, the operation is convenient, the overall adaptability is improved, and the cost is reduced, which is conducive to the enterprise to reduce costs and materials. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0011] Figure 2This is a schematic diagram of the cable lifter structure of this utility model;

[0012] Figure 3 This is a schematic diagram of the running trajectory of the drive cam of this utility model.

[0013] Reference numerals: 1. Drive cam; 11. Cable lifter drive section; 111. Front lever; 112. Cam inclined surface; 113. Cable lifter rod; 121. Pressure rod guide; 131. Pressure rod; 132. Pressure plate. Detailed Implementation

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, and the terms "bottom surface," "top surface," "inner," and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0015] Example 1, referring to Figure 1 As shown, a drive cam 1 for a sewing machine is provided, including a thread lifting drive section 11, a presser foot lifting drive section, and a pressure application drive section. The thread lifting drive section 11 is used to adjust the pressure on the sewing thread, and the driving angle range of the thread lifting drive section 11 is from 0° to the maximum point of the thread lifting angle. The presser foot lifting drive section is used to lift and lower the presser foot lever, and the driving angle range of the presser foot lifting drive section is from the maximum point of the thread lifting angle to the maximum point of the presser foot angle. The pressure application drive section is used to apply pressure to the presser foot lever, and the driving angle range of the presser foot lifting drive section is from the maximum point of the thread lifting angle to the maximum point of the presser foot angle. The drive cam 1 completes the thread lifting action, presser foot lifting action, and pressure application action under the drive of a drive motor at different rotation angles. The drive motor rotates forward to realize the thread lifting action and presser foot lifting action sequentially, and the drive motor rotates in reverse to realize the pressure application action. The drive motor cannot drive the thread lifting action and presser foot lifting action simultaneously with the pressure application action.

[0016] In this embodiment, when a wire lifting action is required, the drive motor rotates counterclockwise, thereby driving the drive cam 1 to rotate. When the drive cam 1 rotates 22 degrees under the drive motor, the cam inclined surface 112 of the drive cam 1 contacts the wire lifting rod 113, and the inclined surface of the drive cam 1 drives the wire lifting rod 113 to make linear displacement, thereby achieving the wire lifting action and releasing the pressure on the wire. When a lifting action is required, the drive motor drives the drive cam 1 to continue rotating to 65 degrees. At this time, one side of the front lever 111 abuts against the pressure rod guide frame 121. The drive motor then continues to drive the drive cam 1 to rotate, thereby driving the wire lifting action. The front lever 111 rotates, and through the contact between the front lever 111 and the pressure rod guide 121, the front lever 111 applies an upward force to the pressure rod guide 121, thereby driving the pressure rod to move and realize the lifting of the pressure foot. When pressure needs to be applied, the drive cam 1 is driven by the drive motor to rotate 25-30 degrees clockwise from the zero position, which drives the pressure rod 131 to contact the pressure plate 132, and the pressure plate 132 is displaced downward under the action of the pressure rod 131, thereby completing the pressure action. The lifting of the pressure foot, the lifting of the line, and the pressure action are realized by the clockwise and counterclockwise rotation of a motor. The structure is simple, the operation is convenient, the overall adaptability is improved, and the cost is reduced, which is conducive to the enterprise to reduce costs and materials.

[0017] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A drive cam for a sewing machine, characterized in that: The driving cam (1) includes a wire lifting driving section (11), a presser foot lifting driving section, and a pressurizing driving section. The wire lifting driving section (11) is used to adjust the pressure on the surface wire. The presser foot lifting driving section is used to lift and lower the presser foot rod. The pressurizing driving section is used to pressurize the presser foot rod. The driving cam (1) completes the wire lifting action, presser foot lifting action, and pressurizing action under the drive of the driving motor at different rotation angles. The driving cam (1) rotates forward to realize the wire lifting action and presser foot lifting action in sequence, and the driving cam (1) rotates in reverse to realize the pressurizing action.

2. The drive cam for a sewing machine according to claim 1, characterized in that: The driving angle range of the lifting section (11) is positive 0° to the maximum value of the lifting angle.

3. The drive cam for a sewing machine according to claim 1, characterized in that: The driving angle range of the lifting foot drive section is from the maximum point of the straight line angle to the maximum point of the lifting foot angle.

4. A drive cam for a sewing machine according to claim 1, characterized in that: The driving angle range of the pressurization drive section is from -0° to the maximum value of the pressurization angle.

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