Backward dragging device of sewing machine

Abstract

The utility model discloses a rear dragging device of a sewing machine, and relates to the technical field of sewing machine equipment. Comprising a fixed shell, a lifting motor, a rotating motor, a tug lifting mechanism, a belt conveying mechanism and a rear tug, the lifting motor is connected with the rear tug through the tug lifting mechanism, and the rotating motor is connected with the rear tug through the belt conveying mechanism; the tug lifting mechanism comprises an eccentric assembly, a linear guide rail, a linear sliding block, a sliding block fixing frame and a positioning pin, the linear guide rail is fixedly installed on the inner wall of the fixed shell, the linear sliding block is installed on the linear guide rail in a sliding mode, and the upper end of the sliding block fixing frame is installed on the linear sliding block; one end of the positioning pin penetrates through the sliding block fixing frame and is fixedly installed on the linear sliding block, the other end of the positioning pin is connected with one end of the eccentric assembly, and the other end of the eccentric assembly is connected with the output end of the lifting motor. According to the rear dragging device, in the process that the rear dragging wheel ascends or descends, the rotating motor does not need to be driven to move together, and loads in the moving process are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, and particularly relates to a rear dragging device for a sewing machine. Background Art

[0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the sewing material, so as to interweave or sew together one or more layers of sewing materials. It is a commonly used fabric processing device in textile and garment production enterprises. During the sewing process, in order to ensure the flatness of the sewing material, a rear dragging device that can drag the fabric backward and drive the dragging wheel to move upward is usually required to ensure the flatness of the sewing material.

[0003] In the prior art, there is a Chinese utility model patent with the publication number CN218372734U and the name of a cloth dragging wheel device for a sewing machine. It drives the lifting frame to rise or fall through a lifting drive motor. The lifting frame drives the dragging wheel drive motor and the dragging wheel to lift or press down. The dragging wheel only moves in the vertical direction following the lifting frame without deviation, and the cloth dragging effect is good. However, this solution uses a lifting drive motor to drive the dragging wheel drive motor and the dragging wheel as a whole to move, resulting in a problem of large load. Summary of the Utility Model

[0004] The main purpose of the present utility model is to provide a rear dragging device for a sewing machine to overcome or improve at least one technical problem of the prior art, or to provide a useful alternative solution.

[0005] To solve the above technical problems, the present utility model adopts the following technical solutions:

[0006] A rear dragging device for a sewing machine includes a fixed housing, a lifting motor, a rotating motor, a dragging wheel lifting mechanism, a belt transmission mechanism, and a rear dragging wheel. The lifting motor and the rotating motor are both fixedly installed on the side of the fixed housing. The lifting motor is connected to the rear dragging wheel through the dragging wheel lifting mechanism, and the rotating motor is connected to the rear dragging wheel through the belt transmission mechanism;

[0007] The dragging wheel lifting mechanism includes an eccentric component, a linear guide rail, a linear slider, a slider fixing frame, and a positioning pin. The linear guide rail is fixedly installed on the inner wall of the fixed housing. The linear slider is slidably installed on the linear guide rail. The upper end of the slider fixing frame is installed on the linear slider, and the lower end is connected to the rear dragging wheel. One end of the positioning pin penetrates through the slider fixing frame and is fixedly installed on the linear slider, and the other end is connected to one end of the eccentric component. The other end of the eccentric component is connected to the output end of the lifting motor.

[0008] Further, the belt transmission mechanism includes a driving wheel, a driven wheel, a first auxiliary wheel, a second auxiliary wheel, a third auxiliary wheel, a guiding bearing, and a synchronous belt. The driving wheel is mounted on the output shaft of the rotating motor, the driven wheel is mounted on the transmission shaft of the trailing wheel, the first auxiliary wheel, the second auxiliary wheel, and the third auxiliary wheel are all fixedly mounted on the side wall of the slider fixing frame, the guiding bearing is fixedly mounted on the inner wall of the fixed housing, and the synchronous belt is sequentially sleeved on the driving wheel, the guiding bearing, the first auxiliary wheel, the second auxiliary wheel, the driven wheel, and the third auxiliary wheel.

[0009] Further, the eccentric component includes a crank wheel, a crank connecting rod, and a set screw. The crank wheel is mounted on the output shaft of the lifting motor, the crank wheel is provided with an eccentric hole, the crank connecting rod is connected to the eccentric hole through the set screw, and a deep groove ball bearing is provided between the crank connecting rod and the set screw.

[0010] Further, a sliding groove for the positioning pin to slide is provided on the crank connecting rod in the vertical direction.

[0011] Further, a belt protection cover is provided outside the synchronous belt, and the belt protection cover is mounted on the slider fixing frame.

[0012] Further, the lower end of the slider fixing frame is sleeved outside the transmission shaft of the trailing wheel, and a bearing is provided between the slider fixing frame and the transmission shaft.

[0013] Further, a base is further included, and a mounting frame is provided on the top of the base, and the fixed housing is fixedly arranged on the mounting frame.

[0014] Compared with the prior art, the present utility model has the following beneficial effects:

[0015] When the trailing device of the present utility model is adopted, during the process of realizing the rising or falling of the trailing wheel, there is no need to drive the rotating motor to move together, which reduces the load during the movement process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present utility model.

[0017] Figure 2 It is a schematic diagram of the overall structure of the present utility model from another angle.

[0018] Figure 3 It is a schematic diagram of the structure at the fixed housing and the trailing wheel of the present utility model.

[0019] Figure 4 It is a schematic diagram of the internal structure at the fixed housing and the trailing wheel of the present utility model.

[0020] Figure 5 The structural schematic diagram of the tugboat lifting mechanism of the present utility model.

[0021] Figure 6 The structural schematic diagram of the eccentric component of the present utility model.

[0022] Figure 7 The side view of the crank wheel and the crank connecting rod of the present utility model.

[0023] Figure 8 The side view of the fixed housing and the belt transmission mechanism of the present utility model.

[0024] Figure 9 The structural schematic diagram of the fixed housing and the belt transmission mechanism of the present utility model.

[0025] Wherein, 1. Base, 2. Mounting frame, 3. Fixed housing, 4. Lifting motor, 5. Rotating motor, 6. Tugboat lifting mechanism, 61. Linear guide rail, 62. Linear slider, 63. Slider fixing frame, 64. Positioning pin, 65. Bearing, 66. Avoidance groove, 7. Belt transmission mechanism, 71. Driving wheel, 72. Driven wheel, 73. First auxiliary wheel, 74. Second auxiliary wheel, 75. Third auxiliary wheel, 76. Guide bearing, 77. Timing belt, 78. Belt protection cover, 8. Rear tugboat, 81. Transmission shaft, 9. Eccentric component, 91. Crank wheel, 92. Crank connecting rod, 93. Set screw, 94. Eccentric hole, 95. Chute, 10. Bottom wheel. Specific embodiments

[0026] The technical solution of the present utility model will be further described below with reference to the accompanying drawings and embodiments.

[0027] Combined with Figures 1 to 9 , this embodiment provides a rear tug device for a sewing machine, including a base 1, a mounting frame 2, a fixed housing 3, a lifting motor 4, a rotating motor 5, a tugboat lifting mechanism 6, a belt transmission mechanism 7 and a rear tugboat 8. The lifting motor 4 and the rotating motor 5 are both fixedly installed on the side of the fixed housing 3. The lifting motor 4 is connected to the rear tugboat 8 through the tugboat lifting mechanism 6, and the rotating motor 5 is connected to the rear tugboat 8 through the belt transmission mechanism 7. The mounting frame 2 is arranged on the top of the base 1, and the fixed housing 3 is fixedly arranged on the mounting frame 2.

[0028] In this embodiment, the tugboat lifting mechanism 6 includes an eccentric component 9, a linear guide rail 61, a linear slider 62, a slider fixing frame 63 and a positioning pin 64. The linear guide rail 61 is fixedly installed on the inner wall of the fixed housing 3. The linear slider 62 is slidably installed on the linear guide rail 61. The upper end of the slider fixing frame 63 is installed on the linear slider 62, and the lower end is connected to the rear tugboat 8. One end of the positioning pin 64 penetrates through the slider fixing frame 63 and is fixedly installed on the linear slider 62, and the other end is connected to one end of the eccentric component 9. The other end of the eccentric component 9 is connected to the output end of the lifting motor 4.

[0029] With this solution, both the lifting motor 4 and the rotating motor 5 are arranged on the fixed housing 3. The lifting motor 4 drives the eccentric component 9 to perform eccentric rotational motion, thereby driving the positioning pin 64 to rise or fall. The positioning pin 64 drives the linear slider 62 to move along the linear guide rail 61. The linear slider 62 drives the slider fixing frame 63 to move, and the slider fixing frame 63 drives the rear tugboat 8 to move, finally realizing the rise or fall of the rear tugboat 8. In this process, there is no need to drive the rotating motor 5 to move together, reducing the load during the movement.

[0030] Preferably, the eccentric component 9 includes a crank wheel 91, a crank connecting rod 92 and a set screw 93. The crank wheel 91 is installed on the output shaft of the lifting motor 4. The crank wheel 91 is provided with an eccentric hole 94. The crank connecting rod 92 is connected to the eccentric hole 94 through the set screw 93. A deep groove ball bearing is provided between the crank connecting rod 92 and the set screw 93.

[0031] Specifically, a sliding groove 95 for the positioning pin 64 to slide is provided on the crank connecting rod 92 in the vertical direction.

[0032] During operation, the lifting motor 4 drives the crank wheel 91 to rotate, and the crank wheel 91 drives the crank connecting rod 92 to perform eccentric rotational motion, thereby driving the positioning pin 64 to perform a rising or falling motion.

[0033] In this embodiment, the belt transmission mechanism 7 includes a driving wheel 71, a driven wheel 72, a first auxiliary wheel 73, a second auxiliary wheel 74, a third auxiliary wheel 75, a guide bearing 76 and a synchronous belt 77. The driving wheel 71 is installed on the output shaft of the rotating motor 5. The driven wheel 72 is installed on the transmission shaft 81 of the rear tugboat 8. The first auxiliary wheel 73, the second auxiliary wheel 74 and the third auxiliary wheel 75 are all fixedly installed on the side wall of the slider fixing frame 63. The guide bearing 76 is fixedly installed on the inner wall of the fixed housing 3. The synchronous belt 77 is sequentially sleeved on the driving wheel 71, the guide bearing 76, the first auxiliary wheel 73, the second auxiliary wheel 74, the driven wheel 72 and the third auxiliary wheel 75.

[0034] With this solution, during the upward movement of the rear towing wheel 8, the driven wheel 72 will move upward accordingly, and the first auxiliary wheel 73, the second auxiliary wheel 74, and the third auxiliary wheel fixed on the slider fixing bracket 63 will also move upward accordingly. However, the driving wheel 71 on the output shaft of the rotating motor 5 and the guiding bearing 76 on the inner wall of the fixed housing 3 are fixed and immovable. As a result, the stroke of the synchronous belt 77 remains unchanged and is always in a tensioned state.

[0035] Preferably, a belt protection cover 78 is provided outside the synchronous belt 77, and the belt protection cover 78 is installed on the slider fixing bracket 63.

[0036] Preferably, the lower end of the slider fixing bracket 63 is sleeved outside the transmission shaft 81 of the rear towing wheel 8, and a bearing 65 is provided between the slider fixing bracket 63 and the transmission shaft 81.

[0037] Preferably, avoidance grooves 66 are provided on the slider fixing bracket 63 corresponding to the positions of the driving wheel 71 and the crank connecting rod 92.

[0038] In a further embodiment, a bottom wheel 10 is provided on the base 1, and a bottom wheel driving motor is provided on the mounting frame 2. The bottom wheel driving motor is used to drive the bottom wheel 10 to rotate. The specific transmission connection relationship is the same as that of the patent with the publication number CN218372734U in the prior art.

[0039] In a further embodiment, a spring adjusting nut and a spring adjusting screw cap are further provided on the fixed housing 3, and a spring (not shown in the figure) is provided inside. The spring is used to adjust the magnitude of the pressure exerted on the rear towing wheel downward, which also belongs to the prior art and will not be elaborated here.

[0040] The above description is only a preferred embodiment of the present invention, and does not impose any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes, and decorations made to the above embodiments based on the technical essence of the present invention still belong to the scope of the technical solution of the present invention.

Claims

1. A rear dragging device for a sewing machine, characterized in that, It includes a fixed housing, a lifting motor, a rotating motor, a pulley lifting mechanism, a belt transmission mechanism and a rear pulley. The lifting motor and the rotating motor are both fixedly installed on the side of the fixed housing. The lifting motor is connected to the rear pulley through the pulley lifting mechanism, and the rotating motor is connected to the rear pulley through the belt transmission mechanism; The pulley lifting mechanism includes an eccentric component, a linear guide rail, a linear slider, a slider fixing frame and a positioning pin. The linear guide rail is fixedly installed on the inner wall of the fixed housing. The linear slider is slidably installed on the linear guide rail. The upper end of the slider fixing frame is installed on the linear slider, and the lower end is connected to the rear pulley. One end of the positioning pin penetrates through the slider fixing frame and is fixedly installed on the linear slider, and the other end is connected to one end of the eccentric component. The other end of the eccentric component is connected to the output end of the lifting motor.

2. The rear dragging device of a sewing machine according to claim 1, wherein, The belt transmission mechanism includes a driving wheel, a driven wheel, a first auxiliary wheel, a second auxiliary wheel, a third auxiliary wheel, a guide bearing and a synchronous belt. The driving wheel is installed on the output shaft of the rotating motor. The driven wheel is installed on the transmission shaft of the rear pulley. The first auxiliary wheel, the second auxiliary wheel and the third auxiliary wheel are all fixedly installed on the side wall of the slider fixing frame. The guide bearing is fixedly installed on the inner wall of the fixed housing. The synchronous belt is sequentially sleeved on the driving wheel, the guide bearing, the first auxiliary wheel, the second auxiliary wheel, the driven wheel and the third auxiliary wheel.

3. The rear dragging device of a sewing machine according to claim 1 or 2, characterized in that The eccentric component includes a crank wheel, a crank connecting rod and a set screw. The crank wheel is installed on the output shaft of the lifting motor. The crank wheel is provided with an eccentric hole. The crank connecting rod is connected to the eccentric hole through the set screw. A deep groove ball bearing is arranged between the crank connecting rod and the set screw.

4. The back-dragging device of a sewing machine according to claim 3, wherein, A sliding groove for the positioning pin to slide is arranged on the crank connecting rod in the vertical direction.

5. The back-dragging device of a sewing machine according to claim 2, wherein A belt protection cover is arranged outside the synchronous belt, and the belt protection cover is installed on the slider fixing frame.

6. The rear drag device of a sewing machine according to claim 2, characterized in that The lower end of the slider fixing frame is sleeved outside the transmission shaft of the rear pulley, and a bearing is arranged between the slider fixing frame and the transmission shaft.

7. The rear dragging device of a sewing machine according to claim 1, wherein, It also includes a base. An installation frame is arranged on the top of the base, and the fixed housing is fixedly arranged on the installation frame.

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