Transmission structure of sewing machine

Abstract

The utility model belongs to the technical field of sewing machines, and particularly relates to a transmission structure of a sewing machine. A driving piece is arranged at the front end part of the machine head through a mounting seat, the driving piece comprises a rotating part, a main shaft is arranged in the machine head, a first avoiding hole is formed in the machine head, the rotating part is connected with the main shaft through a transmission mechanism, the transmission mechanism is arranged in the first avoiding hole in a penetrating manner, and the driving piece drives the transmission mechanism to act so as to drive the main shaft to rotate; a traditional transmission structure is broken through, movement of the upper shaft (namely the main shaft) and the lower shaft is driven by one motor to be independently driven by the upper motor and the lower motor, so that a long shaft is omitted, the motors can be moved from the tail end of a machine body to the front end of the machine body, the shortest driving shaft is achieved, and finally the purposes of speed increase, vibration reduction and noise reduction can be achieved.

Description

Technical field:

[0001] The utility model belongs to the technical field of sewing machines, in particular to a transmission structure of a sewing machine. Background technology:

[0002] For example, a Chinese invention patent (publication number CN 108301142, application date 2018.02.27, publication date 2018.07.20) discloses a template sewing machine, comprising a housing, a frame and a table, wherein the housing comprises a head for supporting a rotatable upper shaft, a bottom plate front seat for supporting a rotatable lower shaft, and a base, wherein the head, the bottom plate front seat and the base are three independent parts, and one end of the head has a column portion extending up and down, the lower section of the column portion, the bottom plate front seat and the base are all located below the table, the column portion and the bottom plate front seat are distributed at both ends of the base along the Y direction, and the column portion and the bottom plate front seat are arranged on the upper and lower ends of the base. The front seats are fixed to the base, and the table and base are fixed to the frame. It also includes a main motor fixed to the middle column of the machine head and driving the upper shaft to rotate. The upper shaft is connected to the lower shaft through a transmission mechanism to drive the lower shaft to rotate. The lower shaft drives the shuttle mechanism to rotate. The upper shaft and the lower shaft both extend axially along the Y direction. The transmission mechanism includes a synchronous wheel shaft extending axially along the Y direction, an upper synchronous wheel fixed on the upper shaft, a lower synchronous wheel fixed at one end of the synchronous wheel shaft, a synchronous belt connecting the upper synchronous wheel and the lower synchronous wheel, and a gear box installed in the front seat of the base plate. The other end of the synchronous wheel shaft is connected to the lower shaft through the gear box.

[0003] As can be seen from the above, the upper shaft of the above template sewing machine is too long. When moving at high speed, due to the dynamic balance, it is easy to cause the machine body to shake and make obvious noise, thereby limiting the movement speed of the template sewing machine. Summary of the invention:

[0004] The utility model aims to provide a transmission structure of a sewing machine which can increase speed, reduce vibration and reduce noise.

[0005] The utility model is achieved in this way:

[0006] A transmission structure of a sewing machine, the sewing machine includes a head, a driving member is provided at the front end of the head through a mounting seat, the driving member includes a rotating part, a main shaft is provided in the head, and a first avoidance hole is provided on the head. The rotating part and the main shaft are connected by a transmission mechanism, the transmission mechanism is passed through the first avoidance hole, and the driving member drives the transmission mechanism to move, thereby driving the main shaft to rotate.

[0007] In the above-mentioned transmission structure of a sewing machine, the mounting seat is L-shaped, including a vertical plate and a horizontal plate. The horizontal plate is mounted on the machine head through fasteners, and a second avoidance hole is provided on the horizontal plate, the position of which corresponds one-to-one to the first avoidance hole. The driving member is mounted on the vertical plate.

[0008] In the above-mentioned transmission structure of a sewing machine, the transmission mechanism is a synchronous belt transmission mechanism, including a main synchronous pulley arranged on the rotating part and a slave synchronous pulley arranged on the main shaft. The main synchronous pulley and the slave synchronous pulley are connected by a synchronous belt transmission, and the synchronous belt is arranged to pass through the first avoidance hole and the second avoidance hole.

[0009] In the above-mentioned transmission structure of a sewing machine, a tensioning mechanism is provided on the mounting seat.

[0010] In the above-mentioned transmission structure of a sewing machine, the tensioning mechanism includes an adjusting plate and an adjusting seat. The adjusting plate is provided with a strip-shaped adjusting hole with a long axis arranged in the up-down direction. The adjusting plate is connected to the mounting seat through a fastener passing through the strip-shaped adjusting hole. The driving member is installed on the adjusting plate. One end of the adjusting seat is fixed to the mounting seat by a fastener, and the other end is provided with an adjusting screw. The adjusting screw is threaded on the adjusting plate, and a locking nut is provided on the adjusting screw.

[0011] In the transmission structure of the sewing machine described above, the main shaft is rotatably arranged in the machine head through the front bearing assembly and the rear bearing assembly.

[0012] In the above-mentioned transmission structure of a sewing machine, the driving member is a motor, and the rotating part is a motor shaft.

[0013] The outstanding advantages of the utility model compared with the prior art are:

[0014] 1. The utility model breaks through the traditional transmission structure. The movement of the upper shaft (i.e. the main shaft) and the lower shaft is driven by an independent motor instead of one motor, thus eliminating the long shaft. The installation position of the motor can be moved from the rear end to the front end of the fuselage to achieve the shortest drive shaft, which can ultimately achieve the purpose of speed increase, vibration reduction and noise reduction.

[0015] 2. The utility model is provided with a tensioning mechanism, which can adjust the tension of the synchronous belt at any time, and the adjustment is quick and convenient.

[0016] 3. The utility model changes the mechanical installation method without changing the conventional operation mode of the template sewing machine, and the motor is externally placed, which reduces the difficulty of later maintenance. Description of the drawings:

[0017] Figure 1 It is a schematic diagram of the utility model;

[0018] Figure 2 yes Figure 1 A partial enlarged schematic diagram;

[0019] Figure 3 It is an explosion diagram of the utility model;

[0020] Figure 4 It is an exploded schematic diagram of the transmission structure of the utility model;

[0021] Figure 5 This is a schematic diagram of the utility model wherein the synchronous belt passes through the second avoidance hole;

[0022] Figure 6 This is a schematic diagram of the tensioning device of the utility model being installed on a mounting base;

[0023] Figure 7 It is an exploded schematic diagram of the tensioning device of the utility model.

[0024] In the figure: 1. Machine head; 2. Mounting seat; 3. Driving part; 4. Rotating part; 5. Main shaft; 6. Front bearing assembly; 7. Rear bearing assembly; 8. First avoidance hole; 9. Vertical plate; 10. Horizontal plate; 11. Second avoidance hole; 12. Main synchronous pulley; 13. Slave synchronous pulley; 14. Synchronous belt; 15. Adjustment plate; 16. Adjustment seat; 17. Bar adjustment hole; 18. Adjustment screw; 19. Locking nut. Specific implementation method:

[0025] The present invention is further described below with reference to specific embodiments. Figure 1 —6:

[0026] The utility model provides a transmission structure of a sewing machine, comprising a machine head 1, a driving member 3 being provided at the front end of the machine head 1 via a mounting seat 2, the driving member 3 comprising a rotating portion 4, a main shaft 5 being provided within the machine head 1, the main shaft 5 being rotatably provided within the machine head 1 via a front bearing assembly 6 and a rear bearing assembly 7. A first avoidance hole 8 is provided on the machine head 1, the rotating portion 4 and the main shaft 5 being connected via a transmission mechanism, the transmission mechanism being provided within the first avoidance hole 8, the driving member 3 driving the transmission mechanism to operate, thereby driving the main shaft 5 to rotate.

[0027] Specifically, the driving member 3 is a motor, and the rotating portion 4 is a motor shaft.

[0028] The utility model breaks through the traditional transmission structure. The movement of the upper shaft (i.e. the main shaft) and the lower shaft is driven by an upper motor and an lower motor respectively, which eliminates the long shaft. The installation position of the motor can be moved from the rear end to the front end of the fuselage to realize the shortest drive shaft, which can ultimately achieve the purpose of speed increase, vibration reduction and noise reduction.

[0029] In this embodiment, the mounting base 2 is L-shaped and includes a vertical plate 9 and a horizontal plate 10. The horizontal plate 10 is mounted on the machine head 1 by fasteners, and a second avoidance hole 11 is provided on the horizontal plate 10, which corresponds one-to-one to the first avoidance hole 8 to facilitate the passage of the transmission mechanism. The driving member 3 is mounted on the vertical plate 9.

[0030] In order to increase the strength, ribs may be provided between the vertical plates 9 and the horizontal plates 10 .

[0031] Specifically, the transmission mechanism is a synchronous belt transmission mechanism, comprising a main synchronous pulley 12 provided on the rotating portion 4 and a secondary synchronous pulley 13 provided on the main shaft 5. The main synchronous pulley 12 and the secondary synchronous pulley 13 are connected by a synchronous belt 14, which passes through the first avoidance hole 8 and the second avoidance hole 11. In this case, the rotating portion 4 is arranged parallel to the axis of the main shaft 5.

[0032] In addition to synchronous belt transmission, the transmission mechanism of the present invention may also adopt a gear transmission structure, such as providing a driving gear and a driven gear that mesh with each other on the rotating part 4 and the main shaft 5 respectively.

[0033] Since the synchronous belt 14 may become loose after being used for a period of time, a tensioning mechanism is provided on the mounting seat 2 in order to ensure normal transmission of the synchronous belt.

[0034] Specifically, the tensioning mechanism includes an adjusting plate 15 and an adjusting seat 16. The adjusting plate 15 is provided with a strip-shaped adjusting hole 17 whose long axis is arranged in the up and down direction. The adjusting plate 15 is connected to the mounting seat 2 through a fastener passing through the strip-shaped adjusting hole 17. The driving member 3 is installed on the adjusting plate 15. One end of the adjusting seat 16 is fixed to the mounting seat 2 through a fastener, and the other end is provided with an adjusting screw 18. The adjusting screw 18 is screwed to the adjusting plate 15, and a locking nut 19 is provided on the adjusting screw 18.

[0035] When adjusting screw 18 is rotated clockwise, the restrictive action of adjusting seat 16 moves adjusting plate 15 and drive member 3 upward, tightening timing belt 14. Conversely, when adjusting screw 18 is rotated counterclockwise, adjusting plate 15 and drive member 3 move downward, loosening the timing belt. When the tension of timing belt 14 is adjusted to the appropriate level, lock nut 19 downward to prevent loosening of adjusting screw 18 and change in the tension of timing belt 14.

[0036] As can be seen from the above, the present invention installs the motor on the machine head 1, which changes the mechanical installation method, but does not change the conventional operation mode of the template sewing machine. The external placement of the motor also reduces the difficulty of later maintenance.

[0037] The above embodiment is only one of the preferred embodiments of the present invention and is not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes made based on the shape, structure, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A transmission structure of a sewing machine, comprising a machine head (1), characterized in that: The front end of the machine head (1) is provided with a driving member (3) through a mounting seat (2), and the driving member (3) includes a rotating part (4). A main shaft (5) is provided in the machine head (1), and a first avoidance hole (8) is provided on the machine head (1). The rotating part (4) and the main shaft (5) are connected via a transmission mechanism, and the transmission mechanism is provided in the first avoidance hole (8). The driving member (3) drives the transmission mechanism to move, thereby driving the main shaft (5) to rotate.

2. The transmission structure of a sewing machine according to claim 1, characterized in that: The mounting seat (2) is L-shaped and includes a vertical plate (9) and a horizontal plate (10). The horizontal plate (10) is mounted on the machine head (1) via fasteners, and a second avoidance hole (11) is provided on the horizontal plate (10) and corresponds in position to the first avoidance hole (8). The driving member (3) is mounted on the vertical plate (9).

3. The transmission structure of a sewing machine according to claim 2, characterized in that: The transmission mechanism is a synchronous belt transmission mechanism, comprising a main synchronous pulley (12) arranged on a rotating part (4) and a slave synchronous pulley (13) arranged on a main shaft (5); the main synchronous pulley (12) and the slave synchronous pulley (13) are connected by a synchronous belt (14); and the synchronous belt (14) is arranged to pass through a first avoidance hole (8) and a second avoidance hole (11).

4. The transmission structure of a sewing machine according to claim 3, characterized in that: A tensioning mechanism is provided on the mounting seat (2).

5. The transmission structure of a sewing machine according to claim 4, characterized in that: The tensioning mechanism comprises an adjusting plate (15) and an adjusting seat (16); the adjusting plate (15) is provided with a strip-shaped adjusting hole (17) whose long axis is arranged in the up-down direction; the adjusting plate (15) is connected to the mounting seat (2) through a fastener passing through the strip-shaped adjusting hole (17); the driving member (3) is mounted on the adjusting plate (15); one end of the adjusting seat (16) is fixed to the mounting seat (2) through a fastener; the other end is provided with an adjusting screw (18); the adjusting screw (18) is screwed onto the adjusting plate (15), and a locking nut (19) is provided on the adjusting screw (18).

6. A transmission structure for a sewing machine according to any one of claims 1 to 5, characterized in that: The main shaft (5) is rotatably arranged in the machine head (1) through a front bearing assembly (6) and a rear bearing assembly (7).

7. A transmission structure for a sewing machine according to any one of claims 1 to 5, characterized in that: The driving member (3) is a motor, and the rotating part (4) is a motor shaft.

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