A pressing wheel lifting and lowering mechanism for a sewing machine

Abstract

The utility model provides a pressure wheel lifting and placing mechanism for a sewing machine, and belongs to the technical field of sewing machines. It solves the technical problems of the existing sewing machine such as the low lifting height of the pressure wheel. The pressure wheel lifting and placing mechanism of the sewing machine includes a mounting frame, a pressure wheel, a pressure wheel seat, a lifting and placing motor and a connecting rod. The lifting and placing motor is fixed on the mounting frame, and a driving member is connected to the output shaft of the lifting and placing motor. The pressure wheel is rotatably connected to the pressure wheel seat, and a swing arm is fixed on the pressure wheel seat. The end of the swing arm is rotatably connected to the mounting frame. The upper end of the connecting rod is connected to the driving member and can move up and down with the connecting rod when the driving member rotates. The lower end of the connecting rod is movably connected to the pressure wheel seat through a connecting member, and the connecting member is located directly below the driving member. The utility model has the advantage of being able to increase the lifting height of the pressure wheel.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewing machines and relates to a sewing machine, in particular to a pressure wheel lifting and lowering mechanism of the sewing machine. Background Art

[0002] At present, the transfer of fabrics in sewing machines is realized by an automatic fabric feeding structure. Automatic fabric feeding can reduce wrinkles at the seam and can also realize smooth sewing of heavy fabrics. For example, a sewing machine feeding device disclosed in a Chinese patent document [authorization announcement number CN213866725U], a swing seat is swingably connected to a motor bracket, a roller for feeding fabrics is provided on the swing seat, and a lifting component for connecting and controlling the swing of the swing seat is provided at the upper end of the motor bracket. The lifting component can control the swinging motion of the entire swing seat to realize the lifting or lowering of the roller. The lifting component includes a connecting rod, the other end of which is connected to the middle section of the swing seat, and the connecting rod is swung by an eccentric block driven by a second motor. In this patent, the connecting part is located in the middle of the pendulum seat, the roller is located at one end of the pendulum seat, and the eccentric block is located above the other end of the pendulum seat, which makes the connecting rod set at an angle. When the eccentric block pulls the connecting rod obliquely upward, the pendulum seat is lifted, and when it pulls the connecting rod obliquely downward, the pendulum seat is lowered. This causes the up and down displacement of the pendulum seat to be smaller than the eccentric distance of the eccentric block, the swing amplitude of the pendulum seat is smaller, and the height of the roller being lifted is smaller, resulting in a smaller operating space when the cloth is placed under the roller, inconvenient operation, and reduced production efficiency. Utility Model Content

[0003] The utility model aims to solve the above problems in the prior art and proposes a press wheel lifting and lowering mechanism for a sewing machine. The technical problem solved by the utility model is to increase the lifting height of the press wheel.

[0004] The purpose of the utility model can be achieved through the following technical solutions:

[0005] A pressure wheel lifting and lowering mechanism for a sewing machine comprises a mounting frame and a pressure wheel, and is characterized in that the pressure wheel lifting and lowering mechanism also comprises a pressure wheel seat, a lifting discharge motor and a connecting rod, the lifting discharge motor is fixed on the mounting frame, a driving member is connected to the output shaft of the lifting discharge motor, the pressure wheel is rotatably connected to the pressure wheel seat, a swing arm is fixed on the pressure wheel seat, the end of the swing arm is rotatably connected to the mounting frame, the upper end of the connecting rod is connected to the driving member and can move the connecting rod up and down when the driving member rotates, the lower end of the connecting rod is movably connected to the pressure wheel seat through a connecting member, and the connecting member is located directly below the driving member.

[0006] The mounting frame is also rotatably connected to a lower roller, and the pressure roller is located directly above the lower roller; the lifting discharge motor can drive the driving member to rotate, and the pressure roller seat can realize the swinging direction in the up and down direction through the swing arm; when loading, the driving member first drives the connecting rod to move upward, and the connecting rod synchronously drives the pressure roller seat to swing upward, so that the pressure roller is lifted relative to the lower roller. At this time, the cloth can be placed between the pressure roller and the lower roller; after the loading is completed, the driving member rotates to drive the connecting rod to move downward, and the connecting rod synchronously drives the pressure roller seat to swing downward, so that the pressure roller is put down relative to the lower roller. At this time, the cloth is clamped between the pressure roller and the lower roller, and the pressure roller and the lower roller rotate to realize the moving conveying of the cloth; the connecting member located directly below the driving member enables the connecting rod to be used in a vertical state, that is, the up and down displacement of the connecting rod driven by the driving member is converted into the up and down displacement of the pressure roller seat, and the up and down swinging amplitude of the pressure roller seat is increased by the up and down movement of the connecting rod, and the pressure roller can be lifted higher, so that the operation space is larger when the cloth is put in, the operation is more convenient, and the production efficiency is improved.

[0007] In the above-mentioned press wheel lifting and lowering mechanism of the sewing machine, the connecting member is a rod end joint bearing, the rod end of the rod end joint bearing is fixedly connected to the lower end of the connecting rod, and a fixing bolt is screwed on the press wheel seat, and the fixing bolt passes through the spherical bearing of the rod end joint bearing. When the press wheel seat swings up and down, there will be a displacement in the front-to-back direction. The rod end joint bearing can ensure that the connecting rod can move up and down with the press wheel seat, and can also adapt to the front-to-back movement of the press wheel seat.

[0008] As another case, in the above-mentioned press wheel lifting and lowering mechanism of the sewing machine, the connecting member is a universal joint, one end of which is fixedly connected to the lower end of the connecting rod, and the other end of which is fixedly connected to the press wheel seat. The universal joint can ensure that the connecting rod can move up and down with the press wheel seat, and can also adapt to the forward and backward movement of the press wheel seat.

[0009] In the above-mentioned press wheel lifting and lowering mechanism of the sewing machine, there are two swing arms, which are respectively aligned with the two ends of the press wheel seat, and the mounting frame is provided with a rotating shaft, and the two swing arms are connected to the rotating shaft. This structure can make the structure more stable when the press wheel seat swings.

[0010] In the above-mentioned press wheel lifting and lowering mechanism of the sewing machine, the driving part is an eccentric wheel, the output shaft of the lifting and lowering motor is arranged horizontally, the eccentric wheel is fixedly mounted on the output shaft of the lifting and lowering motor, an eccentric shaft is eccentrically arranged on the wheel surface of the eccentric wheel, and the upper end of the connecting rod is rotatably connected with the eccentric shaft. The lifting and lowering motor drives the eccentric wheel to rotate, and when the eccentric shaft on the eccentric wheel rotates to the highest point, the connecting rod moves upward to the highest point, and the connecting rod swings the press wheel seat upward and lifts it to the highest position, at which time the press wheel is lifted; when the eccentric shaft on the eccentric wheel rotates to the lowest point, the connecting rod moves downward to the lowest point, and the connecting rod swings the press wheel seat downward and lowers it to the lowest position, at which time the press wheel is lowered; the up and down displacement of the press wheel seat is twice the eccentric distance of the eccentric shaft, and the up and down swing amplitude of the press wheel seat is increased, so that the press wheel can be lifted higher.

[0011] As another case, in the above-mentioned pressure wheel lifting and lowering mechanism of the sewing machine, the driving member is a cylindrical cam, the output shaft of the lifting and lowering motor is vertically arranged, the cylindrical cam is fixedly mounted on the output shaft of the lifting and lowering motor, the mounting frame is provided with a limiting hole, the connecting rod is vertically arranged and passes through the limiting hole, the upper end of the connecting rod is rotatably connected to a roller, and the roller is located in the cam groove of the cylindrical cam. The lifting motor drives the cylindrical cam to rotate horizontally. Under the action of the limit hole, the connecting rod only moves up and down. When the roller of the connecting rod is located at the highest section of the cam slot, the connecting rod moves upward to the highest position. At this time, the connecting rod swings upward and lifts the pressure roller seat and is located at the highest position, and the pressure roller is lifted at this time; after the cylindrical cam rotates, when the roller of the connecting rod rolls to the lowest section of the cam slot, the connecting rod moves downward to the lowest position. At this time, the connecting rod swings downward and lowers the pressure roller seat and is located at the lowest position, and the pressure roller is lowered; the up and down displacement of the pressure roller seat is the vertical distance between the peak and the trough in the cam slot. Increasing the up and down swing amplitude of the pressure roller seat can also lift the pressure roller higher.

[0012] In the above-mentioned sewing machine's pressing wheel lifting and lowering mechanism, the connecting rod includes a telescopically connected lifting rod and a telescopic rod, the upper end of the lifting rod is connected to the driving member, the lower end of the telescopic rod is connected to the connecting member, and the lifting rod and the telescopic rod are provided with springs, and the two ends of the spring are respectively against the lifting rod and the telescopic rod. The thickness of the cloth is uneven, and the telescopic connecting rod can make the roller rise and fall according to the thickness of the cloth when feeding the cloth.

[0013] In the above-mentioned press wheel lifting and lowering mechanism of the sewing machine, the lifting rod is provided with a thread, an adjusting nut is screwed on the lifting rod, and the upper end of the spring abuts against the adjusting nut. The position of the adjusting nut can adjust the elastic force of the spring, and the downward pressure of the roller when feeding the cloth can be adjusted according to the actual thickness of the cloth.

[0014] Compared with the prior art, the press wheel lifting and lowering mechanism of the sewing machine has the following advantages:

[0015] 1. The pressure wheel can be lifted higher, and the structure is simple and stable.

[0016] 2. When the pressure wheel is kept in the raised or lowered position, the load on the discharge motor is small, which increases the service life of the discharge motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the pressure wheel lifting and placing mechanism in the first embodiment.

[0018] Figure 2 It is a front view structural schematic diagram of the pressure wheel lifting and lowering mechanism in the first embodiment.

[0019] Figure 3 It is a three-dimensional structural schematic diagram of the connecting rod.

[0020] Figure 4 It is a schematic diagram of the cross-sectional structure of the connecting rod.

[0021] Figure 5 It is a schematic diagram of the three-dimensional structure of the pressure wheel seat.

[0022] In the figure, 1. mounting frame; 11. driving shaft; 12. lower roller; 13. transmission shaft; 14. pressure roller; 15. rotating shaft; 2. pressure roller seat; 21. swing arm; 22. fixing bolt; 3. lifting motor; 31. eccentric wheel; 32. eccentric shaft; 4. connecting rod; 41. lifting rod; 42. telescopic rod; 421. limiting boss; 43. spring; 44. adjusting nut; 5. rod end joint bearing; 51. rod end; 52. spherical bearing. DETAILED DESCRIPTION

[0023] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0024] Embodiment 1

[0025] like Figures 1 to 5 As shown, the pressing wheel lifting and lowering mechanism of the sewing machine includes a mounting frame 1 and a pressing wheel 14, and the pressing wheel 14 lifting and lowering mechanism also includes a pressing wheel seat 2, a lifting and lowering motor 3 and a connecting rod 4. A transmission shaft 13 is rotatably connected in the pressing wheel seat 2, and the pressing wheel 14 is fixed on the transmission shaft 13. A driving motor is fixed on the mounting frame 1, and the driving motor and the transmission shaft 13 are connected through a driving shaft 11. The two ends of the driving shaft 11 are respectively connected to the driving motor and the transmission shaft 13 through universal joints, and a lower roller 12 is rotatably connected to the mounting frame 1 directly below the pressing wheel 14.

[0026] The pressure roller seat 2 is located directly below the driving member, and two swing arms 21 are fixed on the pressure roller seat 2. A rotating shaft 15 is fixed on the mounting frame 1. The ends of the two swing arms 21 are rotatably connected to the rotating shaft 15. The swing arms 21 are perpendicular to the axis of the pressure roller seat 2. The output shaft of the lifting discharge motor 3 is connected to the driving member, and the upper end of the connecting rod 4 is connected to the driving member and can move up and down with the connecting rod 4 when the driving member rotates. The pressure roller seat 2 and the lower end of the connecting rod 4 are movably connected by a connecting member, and the connecting member is located directly below the driving member.

[0027] Specifically, in this embodiment, the driving member is an eccentric wheel 31, the output shaft of the lifting discharge motor 3 is arranged horizontally, the eccentric wheel 31 is fixedly mounted on the output shaft of the lifting discharge motor 3, an eccentric shaft 32 is eccentrically arranged on the wheel surface of the eccentric wheel 31, and the upper end of the connecting rod 4 is rotatably connected to the eccentric shaft 32.

[0028] The lower end of the connecting rod 4 is screwed and fixed, and a fixing bolt 22 is screwed on the pressure wheel seat 2, and the fixing bolt 22 passes through the spherical bearing 52 of the rod end joint bearing.

[0029] The connecting rod 4 includes a telescopically connected lifting rod 41 and a telescopic rod 42. The upper end of the lifting rod 41 is rotatably connected to the eccentric shaft 32 of the eccentric wheel 31, and the lower end of the telescopic rod 42 is connected to the connecting piece. The lifting rod 41 and the telescopic rod 42 are provided with a spring 43, and the two ends of the spring 43 are respectively against the lifting rod 41 and the telescopic rod 42. The upper end of the telescopic rod 42 is provided with a limiting boss 421, and the lower side of the limiting boss 421 can be against the lifting rod 41. The lifting rod 41 is provided with a thread, and an adjusting nut 44 is screwed on the lifting rod 41, and the upper end of the spring 43 is against the adjusting nut 44.

[0030] When loading, the lifting discharge motor 3 drives the eccentric shaft 32 on the eccentric wheel 31 to rotate to the highest point, the connecting rod 4 moves upward to the highest point, the connecting rod 4 brings the pressure wheel seat 2 to swing upward and lift it to the highest position, and the pressure wheel 14 is lifted. At this time, the cloth can be placed between the pressure wheel 14 and the lower roller 12; after loading is completed, the eccentric shaft 32 on the eccentric wheel 31 rotates to the lowest point, the connecting rod 4 moves downward to the lowest point, the connecting rod 4 brings the pressure wheel seat 2 to swing downward and lower it to the lowest position, so that the pressure wheel 14 is lowered relative to the lower roller 12. At this time, the cloth is clamped between the pressure wheel 14 and the lower roller 12, and the pressure wheel 14 and the lower roller 12 rotate to realize the movement and transportation of the cloth.

[0031] Embodiment 2

[0032] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: the driving member is a cylindrical cam, the output shaft of the lifting discharge motor is vertically arranged, the cylindrical cam is fixedly mounted on the output shaft of the lifting discharge motor, a limiting hole is arranged on the mounting frame, the connecting rod is vertically arranged and passes through the limiting hole, the upper end of the connecting rod is rotatably connected with a roller, and the roller is located in the cam groove of the cylindrical cam. The lifting discharge motor drives the cylindrical cam to rotate horizontally, and under the action of the limiting hole, the connecting rod only moves up and down, and when the roller of the connecting rod is located at the highest section of the cam groove, the connecting rod moves upward to the highest point, at which time the connecting rod swings upward with the pressure roller seat and is at the highest position, and at this time the pressure roller is lifted; after the cylindrical cam rotates, when the roller of the connecting rod rolls to the lowest section of the cam groove, the connecting rod moves downward to the lowest point, at which time the connecting rod swings downward with the pressure roller seat and is lowered and is at the lowest position, and at this time the pressure roller is lowered.

[0033] Embodiment 3

[0034] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that the connecting piece is a universal joint, one end of which is fixedly connected to the lower end of the connecting rod, and the other end of which is fixedly connected to the pressure roller seat. The universal joint can ensure that the connecting rod can move up and down with the pressure roller seat, and can also adapt to the forward and backward movement of the pressure roller seat.

[0035] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A pressing wheel lifting and lowering mechanism for a sewing machine, comprising a mounting frame (1) and a pressing wheel (14), characterized in that: The lifting and lowering mechanism of the pressure wheel (14) also includes a pressure wheel seat (2), a lifting and lowering motor (3) and a connecting rod (4), wherein the lifting and lowering motor (3) is fixed on the mounting frame (1), and a driving member is connected to the output shaft of the lifting and lowering motor (3), the pressure wheel (14) is rotatably connected to the pressure wheel seat (2), a swing arm (21) is fixed on the pressure wheel seat (2), and the end of the swing arm (21) is rotatably connected to the mounting frame (1), the upper end of the connecting rod (4) is connected to the driving member and can move the connecting rod (4) up and down when the driving member rotates, and the lower end of the connecting rod (4) is movably connected to the pressure wheel seat (2) through a connecting member, and the connecting member is located directly below the driving member.

2. The press wheel lifting and lowering mechanism of a sewing machine according to claim 1, characterized in that: The connecting member is a rod end joint bearing (5), the rod end (51) of the rod end joint bearing (5) is fixedly connected to the lower end of the connecting rod (4), and a fixing bolt (22) is screwed on the pressure wheel seat (2), and the fixing bolt (22) passes through the spherical bearing (52) of the rod end joint bearing (5).

3. The press wheel lifting and lowering mechanism of a sewing machine according to claim 1, characterized in that: The connecting piece is a universal joint, one end of which is fixedly connected to the lower end of the connecting rod (4), and the other end of which is fixedly connected to the pressure wheel seat (2).

4. The press wheel lifting and lowering mechanism of the sewing machine according to claim 1, characterized in that: There are two swing arms (21), and the two swing arms (21) are respectively aligned with the two ends of the pressure wheel seat (2). The mounting frame (1) is provided with a rotating shaft (15), and the two swing arms (21) are connected to the rotating shaft (15).

5. The press wheel lifting and lowering mechanism for a sewing machine according to any one of claims 1 to 4, characterized in that: The driving member is an eccentric wheel (31), the output shaft of the lifting and discharging motor (3) is arranged horizontally, the eccentric wheel (31) is fixedly mounted on the output shaft of the lifting and discharging motor (3), an eccentric shaft (32) is eccentrically arranged on the wheel surface of the eccentric wheel (31), and the upper end of the connecting rod (4) is rotatably connected to the eccentric shaft (32).

6. The press wheel lifting and lowering mechanism for a sewing machine according to any one of claims 1 to 4, characterized in that: The driving member is a cylindrical cam, the output shaft of the lifting and discharging motor (3) is vertically arranged, the cylindrical cam is fixedly mounted on the output shaft of the lifting and discharging motor (3), the mounting frame (1) is provided with a limiting hole, the connecting rod (4) is vertically arranged and passes through the limiting hole, the upper end of the connecting rod (4) is rotatably connected to a roller, and the roller is located in the cam slide groove of the cylindrical cam.

7. The press wheel lifting and lowering mechanism for a sewing machine according to any one of claims 1 to 4, characterized in that: The connecting rod (4) comprises a lifting rod (41) and a telescopic rod (42) which are telescopically connected. The upper end of the lifting rod (41) is cooperatively connected to a driving member, and the lower end of the telescopic rod (42) is connected to a connecting member. The lifting rod (41) and the telescopic rod (42) are provided with a spring (43) on their outer sleeves, and the two ends of the spring (43) are respectively in contact with the lifting rod (41) and the telescopic rod (42).

8. The pressing wheel lifting and lowering mechanism of a sewing machine according to claim 7, characterized in that: The lifting rod (41) is provided with a thread, an adjusting nut (44) is threadedly connected to the lifting rod (41), and the upper end of the spring (43) abuts against the adjusting nut (44).

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