Roller lifting and placing mechanism of sewing machine

Abstract

The utility model provides a lifting roller mechanism of a sewing machine, and belongs to the technical field of sewing machines. The roller lifting mechanism solves the technical problems that the lifting height of rollers of an existing roller lifting mechanism is low, and the load on a motor is large. The rolling wheel lifting and placing mechanism of the sewing machine comprises a mounting frame and a rolling wheel mounting seat, an upper rolling wheel is rotationally connected to the rolling wheel mounting seat, the rolling wheel lifting and placing mechanism further comprises a first motor, a connecting rod and a lifting sliding block, the first motor is fixed to the mounting frame and located above the rolling wheel mounting seat, and the lifting sliding block is slidably connected to the mounting frame in the vertical direction; the lifting sliding block is fixedly connected with the roller mounting seat through a fixing rod, an output shaft of the first motor is connected with a driving part, the upper end of the connecting rod is connected with the driving part and can move up and down when the driving part rotates, and the lower end of the connecting rod is connected with the lifting sliding block and can drive the lifting sliding block to move up and down. The roller lifting device has the advantages that the upper roller can be lifted higher, and the service life of the first motor is prolonged.

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 lifting and placing roller mechanism of the sewing machine. Background Art

[0002] At present, the transfer of fabrics in sewing machines is achieved by an automatic cloth feeding structure. Automatic cloth feeding can reduce wrinkles at the seam area and can also achieve smooth sewing of thick fabrics. For example, a sewing machine feeding device disclosed in a Chinese patent document [Authorization Announcement No. CN213866725U], in which a pendulum seat is swingably connected to a motor bracket, and a roller for feeding cloth is provided on the pendulum seat. A lifting component for connecting and controlling the swing of the pendulum seat is provided at the upper end of the motor bracket. The lifting component can control the swinging motion of the entire pendulum seat to realize the lifting or lowering of the roller. The lifting component includes a connecting rod, and the other end of the connecting rod is connected to the middle section of the pendulum seat. The connecting rod is driven by an eccentric block driven by a second motor to realize swinging; the swing of the connecting rod drives The pendulum seat realizes swinging, and the connecting rod is driven by the eccentric block. The connecting rod has a small swing amplitude, which makes the pendulum seat also swing smaller, resulting in a smaller height of the roller being lifted, resulting in a smaller operating space when the cloth is placed under the roller, which is inconvenient to operate and reduces production efficiency; the roller will be subjected to left and right forces when feeding the cloth, and the pendulum seat and the connecting rod are large, and it is impossible to avoid the pendulum seat from shaking left and right, resulting in the roller moving slightly left and right; when swinging, the fulcrum of the connecting rod is located on the eccentric block, and the power arm is extremely short. The load on the motor is large during swinging, resulting in a shorter service life of the motor. Utility Model Content

[0003] The purpose of the utility model is to solve the above problems in the existing technology and propose a lifting and placing roller mechanism for a sewing machine. The technical problem solved by the utility model is to stabilize the lifting and placing roller and increase the service life of the motor.

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

[0005] A lifting and lowering roller mechanism of a sewing machine comprises a mounting frame and a roller mounting seat, an upper roller is rotatably connected to the roller mounting seat, and is characterized in that the lifting and lowering roller mechanism also comprises a motor 1, a connecting rod and a lifting slider, the motor 1 is fixed on the mounting frame and is located above the roller mounting seat, the lifting slider is slidably connected to the mounting frame along the up and down directions, the lifting slider and the roller mounting seat are fixedly connected by a fixing rod, a driving member is connected to the output shaft of the motor 1, the upper end of the connecting rod is connected to the driving member and the connecting rod can move up and down when the driving member rotates, and the lower end of the connecting rod is connected to the lifting slider and can drive the lifting slider to move up and down.

[0006] The mounting frame is also rotatably connected to a lower roller, and the upper roller is located directly above the lower roller; the motor can drive the driving member to rotate. When in use, the driving member first drives the connecting rod to move upward, and the connecting rod simultaneously drives the lifting slider to slide upward, and the roller mounting seat is synchronously lifted through the fixed rod, so that the upper roller is lifted relative to the lower roller. At this time, the cloth can be placed between the upper 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 lifting slider to slide downward, and the roller mounting seat is synchronously lowered through the fixed rod, so that the upper roller is lowered relative to the lower roller. At this time, the cloth It is clamped between the upper roller and the lower roller, and the upper roller and the lower roller rotate to realize the movement and transportation of the cloth; the up and down movement method can lift the upper roller higher, so that the operating space is larger when the cloth is put in, the operation is more convenient, and the production efficiency is improved; the lifting slider is fixedly connected to the roller mounting seat, and the lifting slider can only move in the up and down directions. The position of the roller mounting seat is limited by the fixed rod to avoid the roller mounting seat from moving left and right, making the cloth transportation more stable; the connecting rod and the lifting slider move by moving up and down, which reduces the load on the motor and extends the service life of the motor.

[0007] In the above-mentioned sewing machine's lifting roller mechanism, the driving member is a turntable, the output shaft of the motor 1 is arranged horizontally, the turntable is fixedly mounted on the output shaft of the motor 1, a pin 1 is eccentrically arranged on the turntable surface, the upper end of the connecting rod is rotatably connected to the pin 1, the lifting slider is provided with a pin 2, and the lower end of the connecting rod is rotatably connected to the pin 2. The motor 1 drives the turntable to rotate vertically, the pin 1 on the turntable will rotate in the vertical direction, when the pin 1 rotates to the highest point, the connecting rod moves upward to the highest point, at this time the lifting slider is at the highest position, and the upper roller on the roller mounting seat is lifted; when the pin 1 on the turntable rotates to the lowest point, the connecting rod moves downward to the lowest point, at this time the lifting slider is at the lowest position, and the upper roller on the roller mounting seat is lowered and pressed against the lower roller; when the turntable rotates, the connecting rod moves up and down and swings left and right.

[0008] As another case, in the lifting and lowering roller mechanism of the sewing machine, the driving member is a cylindrical cam, the output shaft of the motor 1 is vertically arranged, the cylindrical cam is fixedly mounted on the output shaft of the motor 1, 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 with a roller, the roller is located in the cam slide groove of the cylindrical cam, and the lower end of the connecting rod is fixedly connected with the lifting slider. Motor 1 drives the cylindrical cam to rotate horizontally, and the connecting rod only moves up and down under the action of the limiting hole. When the roller of the connecting rod is located in the highest section of the cam slide groove, the connecting rod moves upward to the highest position, at which time the lifting slider is at the highest position, and the upper roller on the roller mounting seat is lifted; after the cylindrical cam rotates, when the roller of the connecting rod rolls to the lowest section of the cam slide groove, the connecting rod moves downward to the lowest position, at which time the lifting slider is at the lowest position, and the upper roller on the roller mounting seat is lowered and pressed against the lower roller.

[0009] In the above-mentioned sewing machine roller lifting mechanism, a guide rail is vertically fixed on the mounting frame, and the lifting slider is slidably connected to the guide rail. The guide rail guides the mounting frame to move up and down stably, so that the fixing rod drives the roller mounting seat to move up and down synchronously.

[0010] As another case, in the above-mentioned sewing machine roller lifting mechanism, the mounting frame is provided with a long guide hole in the vertical direction, and the two sides of the lifting slider are provided with guide grooves, the lifting slider is slidably connected in the guide hole, and the two side hole walls of the guide hole are respectively inserted into the two side guide grooves of the lifting slider. The guide hole guides the mounting frame to move up and down stably, so that the fixing rod drives the roller mounting seat to move up and down synchronously.

[0011] In the above sewing machine's lifting roller 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 lifting slider, 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.

[0012] In the above sewing machine's lifting roller mechanism, the lifting rod is provided with a thread, an adjusting nut is screwed onto 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 can adjust the downward pressure of the roller when feeding the cloth according to the actual thickness of the cloth.

[0013] In the above sewing machine lifting roller mechanism, the lower end of the telescopic rod is screwed with a ball buckle, the ball buckle is rotatably connected to the lifting slider, and the lower end of the spring abuts against the ball buckle. This structure can adjust the length of the connecting rod and facilitate assembly.

[0014] In the above-mentioned lifting and lowering roller mechanism of the sewing machine, a limiting boss is provided at the upper end of the telescopic rod, and the lower side surface of the limiting boss can abut against the lifting rod.

[0015] In the above-mentioned sewing machine roller lifting mechanism, the roller mounting seat is provided with a fixing plate, one end of the fixing plate is fixed with a clamp, the fixing rod is fixed through the clamp, and the fixing plate is provided with a long strip adjustment hole in the horizontal direction, and the fixing bolt passes through the adjustment hole to fix the fixing plate on the roller mounting seat. During installation, the fixing plate can be horizontally moved relative to the roller mounting seat to adjust the position and then fixed by the fixing bolt to ensure that the upper roller and the lower roller are parallel, and the fixing rod is fixed to the fixing plate on the roller mounting seat through the clamp.

[0016] Compared with the prior art, the roller lifting and lowering mechanism of the sewing machine has the advantages of simpler overall structure, being able to lift the upper roller higher and increasing the service life of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the lifting and placing roller mechanism.

[0018] Figure 2 It is a front view structural diagram of the lifting and placing roller mechanism.

[0019] Figure 3 It is a front view structural schematic diagram of the connecting rod.

[0020] Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure of AA.

[0021] In the figure, 11, motor 2; 12, transmission shaft; 13, lower roller; 2, roller mounting seat; 21, upper roller; 22, fixing plate; 23, clamp; 24, adjustment hole; 25, fixing bolt; 3, mounting frame; 31, motor 1; 32, turntable; 321, pin 1; 33, guide rail; 34, lifting slider; 341, pin 2; 342, fixing rod; 4, connecting rod; 41, lifting rod; 411, connecting section; 42, telescopic rod; 421, limiting boss; 43, ball head buckle; 44, spring; 45, adjusting nut. DETAILED DESCRIPTION

[0022] 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.

[0023] Embodiment 1

[0024] like Figures 1 to 4As shown, the lifting and lowering roller mechanism of the sewing machine includes a mounting frame 3 and a roller mounting seat 2, an upper roller 21 is rotatably connected to the roller mounting seat 2, a motor 2 11 is fixed on the mounting frame 3, the motor 2 11 and the roller mounting seat 2 are connected through a transmission shaft 12, and a lower roller 13 is rotatably connected to the mounting frame 3 just below the upper roller 21.

[0025] The roller lifting mechanism also includes a motor 31, a connecting rod 4 and a lifting slider 34. The motor 31 is fixed on the mounting frame 3 and is located above the roller mounting seat 2. The output shaft of the motor 31 is horizontally arranged. The output shaft of the motor 31 is connected to a driving member. In the first embodiment, the driving member is a turntable 32. The turntable 32 is fixedly mounted on the output shaft of the motor 31. The motor 31 drives the turntable 32 to rotate vertically. A pin shaft 321 is eccentrically provided on the disk surface of the turntable 32. The upper end of the connecting rod 4 is rotatably connected to the pin shaft 321. A guide rail 33 is vertically fixed on the mounting frame 3. The lifting slider 34 is slidably connected to the guide rail 33. The lifting slider 34 and the roller mounting seat 2 are fixedly connected by a fixing rod 342. A pin shaft 2 341 is provided on the lifting slider 34. The lower end of the connecting rod 4 is rotatably connected to the pin shaft 2 341.

[0026] like Figure 3 and Figure 4 As shown, 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 protruding with a connecting section 411, the pin 1 321 is rotatably connected to the connecting section 411, the upper end of the telescopic rod 42 is provided with a limiting boss 421, the lower side of the limiting boss 421 can abut against the lifting rod 41, the lower end of the telescopic rod 42 is screwed with a ball head buckle 43, the ball head buckle 43 is rotatably connected to the pin 2 341 of the lifting slider 34, the lifting rod 41 and the telescopic rod 42 are provided with a spring 44, the upper end of the spring 44 abuts on the adjusting nut 45, and the lower end of the spring 44 abuts on the ball head buckle 43. The thickness of the cloth is uneven, and the telescopic connection rod 4 can make the roller fluctuate up and down according to the thickness of the cloth when feeding the cloth.

[0027] The roller mounting seat 2 is provided with a fixing plate 22, one end of which is fixed with a clamp 23, a fixing rod 342 is fixed through the clamp 23, a long strip-shaped adjustment hole 24 is opened in the horizontal direction on the fixing plate 22, and a fixing bolt 25 passes through the adjustment hole 24 to fix the fixing plate 22 on the roller mounting seat 2. During installation, the fixing plate 22 can be horizontally moved relative to the roller mounting seat 2 to adjust the position and then fixed by the fixing bolt 25 to ensure that the upper roller 21 and the lower roller 13 are parallel, and the fixing rod 342 is fixed to the fixing plate 22 on the roller mounting seat 2 through the clamp 23.

[0028] The motor 31 drives the turntable 32 to rotate. When in use, when the pin shaft 321 of the turntable 32 rotates to the highest point, the connecting rod 4 moves upward to the highest point. At this time, the lifting slide block 34 is at the highest position, and the upper roller 21 on the roller mounting seat 2 is synchronously lifted and located at the highest point through the fixing rod 342. At this time, the cloth can be placed between the upper roller 21 and the lower roller 13; after the loading is completed, the motor 31 drives the turntable 32 to rotate, and when the pin shaft 321 on the turntable 32 rotates to the lowest point, the connecting rod 4 moves downward to the lowest point, and the connecting rod 4 pushes the lifting slide block 34 to move downward to the lowest position. At the same time, the upper roller 21 on the roller mounting seat 2 is lowered and pressed on the lower roller 13 through the fixing rod 342, so that the upper roller 21 is lowered. At this time, the upper roller 21 can be driven to rotate by the motor 2 11 to realize cloth feeding.

[0029] Embodiment 2

[0030] 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 motor one is vertically arranged, the cylindrical cam is fixedly mounted on the output shaft of the motor one, 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, the roller is located in the cam slide groove of the cylindrical cam, and the lower end of the connecting rod is fixedly connected to the lifting slider. The motor one drives the cylindrical cam to rotate horizontally, and the connecting rod only moves up and down under the action of the limiting hole. When the roller of the connecting rod is located in the highest section of the cam slide groove, the connecting rod moves upward to the highest position, at which time the lifting slider is at the highest position, and the upper roller on the roller mounting seat is lifted; after the cylindrical cam rotates, when the roller of the connecting rod rolls to the lowest section of the cam slide groove, the connecting rod moves downward to the lowest position, at which time the lifting slider is at the lowest position, and the upper roller on the roller mounting seat is lowered and pressed against the lower roller.

[0031] Embodiment 3

[0032] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: a long strip guide hole is provided on the mounting frame in the vertical direction, guide grooves are provided on both sides of the lifting slider, the lifting slider is slidably connected in the guide hole, and the hole walls on both sides of the guide hole are respectively inserted into the guide grooves on both sides of the lifting slider. The guide hole guides the mounting frame to move up and down stably, so that the fixing rod drives the roller mounting seat to move up and down synchronously.

[0033] 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 roller lifting mechanism for a sewing machine, comprising a mounting frame (3) and a roller mounting seat (2), wherein an upper roller (21) is rotatably connected to the roller mounting seat (2), characterized in that: The roller lifting mechanism also includes a motor (31), a connecting rod (4) and a lifting slider (34). The motor (31) is fixed on the mounting frame (3) and is located above the roller mounting seat (2). The lifting slider (34) is connected to the mounting frame (3) in a sliding manner in the up and down direction. The lifting slider (34) and the roller mounting seat (2) are fixedly connected via a fixing rod (342). A driving member is connected to the output shaft of the motor (31). The upper end of the connecting rod (4) is connected to the driving member and the connecting rod (4) can move up and down when the driving member rotates. The lower end of the connecting rod (4) is connected to the lifting slider (34) and can drive the lifting slider (34) to move up and down.

2. The sewing machine lifting roller mechanism according to claim 1, characterized in that: The driving member is a turntable (32), the output shaft of the motor 1 (31) is arranged horizontally, the turntable (32) is fixedly mounted on the output shaft of the motor 1 (31), a pin shaft 1 (321) is eccentrically arranged on the disk surface of the turntable (32), the upper end of the connecting rod (4) is rotatably connected to the pin shaft 1 (321), the lifting slider (34) is provided with a pin shaft 2 (341), and the lower end of the connecting rod (4) is rotatably connected to the pin shaft 2 (341).

3. The lifting roller mechanism of a sewing machine according to claim 1, characterized in that: The driving member is a cylindrical cam, the output shaft of the motor one (31) is vertically arranged, the cylindrical cam is fixedly mounted on the output shaft of the motor one (31), a limiting hole is provided on the mounting frame (3), 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, the roller is located in the cam slide groove of the cylindrical cam, and the lower end of the connecting rod (4) is fixedly connected to a lifting slider (34).

4. The sewing machine lifting roller mechanism according to claim 1, characterized in that: A guide rail (33) is vertically fixed on the mounting frame (3), and the lifting slider (34) is slidably connected to the guide rail (33).

5. The lifting and lowering roller mechanism of a sewing machine according to claim 1, characterized in that: The mounting frame (3) is provided with a long strip guide hole in the vertical direction, and guide grooves are provided on both sides of the lifting slider (34). The lifting slider (34) is slidably connected in the guide hole, and the hole walls on both sides of the guide hole are respectively inserted into the guide grooves on both sides of the lifting slider (34).

6. The sewing machine roller lifting mechanism according to any one of claims 1 to 5, 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 connected to a driving member, and the lower end of the telescopic rod (42) is connected to a lifting slider (34). The lifting rod (41) and the telescopic rod (42) are provided with a spring (44) on their outer sleeves, and the two ends of the spring (44) are respectively in contact with the lifting rod (41) and the telescopic rod (42).

7. The lifting and lowering roller mechanism of a sewing machine according to claim 6, characterized in that: The lifting rod (41) is provided with a thread, an adjusting nut (45) is threadedly connected to the lifting rod (41), and the upper end of the spring (44) abuts against the adjusting nut (45).

8. The lifting and lowering roller mechanism of a sewing machine according to claim 6, characterized in that: The lower end of the telescopic rod (42) is threaded with a ball head buckle (43), the ball head buckle (43) is rotatably connected to the lifting slider (34), and the lower end of the spring (44) is against the ball head buckle (43).

9. The lifting and lowering roller mechanism of a sewing machine according to claim 6, characterized in that: The upper end of the telescopic rod (42) is provided with a limiting boss (421), and the lower side surface of the limiting boss (421) can abut against the lifting rod (41).

10. The lifting roller mechanism of a sewing machine according to any one of claims 1 to 5, characterized in that: The roller mounting seat (2) is provided with a fixing plate (22), one end of which is fixed with a clamp (23), the fixing rod (342) passes through the clamp (23) for fixing, the fixing plate (22) is provided with a long strip-shaped adjustment hole (24) in the horizontal direction, and a fixing bolt (25) passes through the adjustment hole (24) to fix the fixing plate (22) on the roller mounting seat (2).

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