A side cutter mechanism and a sewing machine

Abstract

The application provides a side cutter mechanism and a sewing machine. The side cutter mechanism comprises a side cutter arranged at the side of a needle plate of the sewing machine, a cutter driving motor and a cutter transmission assembly. The cutter driving motor is connected with the side cutter through the cutter transmission assembly and drives the side cutter to move up and down. The cutter driving motor is independent of a needle driving source which drives a needle to move up and down. The application uses an independent cutter driving motor as the driving source of the side cutter to move up and down, which is independent of the needle driving source. The up-and-down movement of the side cutter is independent of the up-and-down movement of the needle. On the one hand, the movement range of the side cutter can be easily changed by changing the operation range of the cutter driving motor, so that the side cutter has multiple different movement amplitudes and meets various cutting requirements. On the other hand, the starting operation angle of the cutter driving motor relative to the needle driving source is adjustable, which realizes synchronous and asynchronous adjustment and reduces the use cost.

Description

Technical Field

[0001] This invention relates to the field of sewing machines, and in particular to a side-cutting mechanism and a sewing machine incorporating the side-cutting mechanism. Background Technology

[0002] Currently, sewing machines are equipped with cutters located on the side of the needle plate that can move up and down reciprocally. The downward movement of the cutter cuts the fabric, thus meeting sewing needs such as hemming and opening pockets in garments. In existing technology, the power for the cutter's reciprocating movement usually comes from the sewing machine's main shaft; that is, the main shaft is connected to the cutter via a mechanical transmission mechanism, thereby driving the cutter's up-and-down movement. However, this structure has the following drawbacks:

[0003] 1. Fixed movement range of the cutter: When cutting fabric with stems, there may be a problem that the cutter cannot cut the material smoothly due to insufficient height.

[0004] 2. The synchronous and asynchronous operation of the cutter and needle bar cannot be switched within the same sewing machine: If the user needs to change the synchronous and asynchronous operation of the cutter and needle bar, a different sewing machine must be used. This is equivalent to having one sewing machine with synchronous cutter and needle bar and another with asynchronous cutter and needle bar, which will increase equipment costs and space requirements.

[0005] 3. Constant cutting force of the cutter: Since the driving source for the movement of the cutter is the main shaft in the sewing machine, the magnitude of the cutting force when the cutter cuts the fabric is transmitted from the main shaft. Therefore, it is impossible to automatically adjust the cutting force of the cutter in real time according to the thickness, density, etc. of the fabric, which may result in some thicker fabrics not being able to be cut smoothly.

[0006] 4. Manual clutch: The clutch of the cutter needs to be manually operated by swinging the mechanical transmission mechanism, which is not easy to operate. Summary of the Invention

[0007] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a side-cutting knife mechanism that allows the side-cutting knife to have multiple different motion amplitudes and to easily switch between the synchronous and asynchronous states of the side-cutting knife and the needle bar.

[0008] To achieve the above objectives, the present invention provides a side-cutting mechanism, including a side-cutting knife disposed on the side of the needle plate in a sewing machine, a cutting knife drive motor, and a cutting knife transmission assembly. The cutting knife drive motor is connected to the side-cutting knife through the cutting knife transmission assembly and drives the side-cutting knife to move up and down reciprocally. The cutting knife drive motor is independent of the needle drive source in the sewing machine that drives the needle to move up and down reciprocally.

[0009] Furthermore, the cutter transmission assembly includes a cutter swing shaft rotatably supported in the sewing machine housing, a first transmission assembly connected between the cutter drive motor and the cutter swing shaft, and a second transmission assembly connected between the cutter swing shaft and the side cutter.

[0010] Furthermore, the first transmission assembly includes a first transmission crank, a first transmission connecting rod, and a second transmission crank fixed on the motor shaft of the cutter drive motor, and the two ends of the first transmission connecting rod are respectively hinged to the first transmission crank and the second transmission crank.

[0011] Furthermore, during the operation of the side cutting mechanism, the motor shaft of the cutting drive motor oscillates back and forth within the working angle zone, with the two ends of the working angle zone being the first angle and the second angle, respectively, and the middle angle of the working angle zone being the third angle.

[0012] When the cutter drive motor rotates to the first angle and the second angle, the side cutter moves up to the highest position;

[0013] When the cutter drive motor rotates to the third angle, the first transmission crank and the first transmission connecting rod are collinear, and the side cutter moves down to the lowest position.

[0014] Furthermore, the second transmission assembly includes a third transmission crank fixed on the cutter swing shaft, a second transmission connecting rod with one end hinged to the third transmission crank, a fixed slide rail with a vertically extending slide groove, a transmission slider that slides in cooperation with the slide groove, a vertically extending cutter shaft, a connecting post fixed on the upper end of the cutter shaft, a drive bracket handle fixed on the lower end of the cutter shaft, and a cutter seat. The connecting post is provided with a first shaft portion, which is rotatably fitted through the other end of the second transmission connecting rod and the transmission slider. The drive bracket handle is provided with a second shaft portion, which is inserted into the cutter seat. The side cutter is mounted on the cutter seat.

[0015] Furthermore, the second transmission assembly also includes a fixed bushing fixed in the sewing machine housing, and the cutter shaft is movably inserted through the fixed bushing.

[0016] Furthermore, the second transmission assembly also includes a cutter holder shaft and a cutter holder guide rod, both fixed to the sewing machine housing. The cutter holder has a shaft hole that slides with the cutter holder shaft and a guide rod hole that slides with the cutter holder guide rod.

[0017] Furthermore, the second transmission assembly also includes a cutter holder and a mounting plate. The cutter holder has an adjustment slot that extends straight along the parallel direction of the needle plate and the side cutter. The cutter holder is fixed to the cutter seat by fixing screws passing through the adjustment slot. The mounting plate is fixed to the cutter holder by fixing screws. The side cutter is clamped between the mounting plate and the cutter holder.

[0018] Furthermore, the side-cutting mechanism also includes an electronic control module and an operation panel, both of which are communicatively connected to the electronic control module.

[0019] The present invention also provides a sewing machine in which a side-cutting mechanism as described above is provided.

[0020] As described above, the side-cutting mechanism and sewing machine of the present invention have the following beneficial effects:

[0021] This application employs a separate cutter drive motor as the driving source for the reciprocating movement of the side cutter, separate from the needle drive source, making the reciprocating movement of the side cutter independent of that of the needle. On one hand, by changing the operating range of the cutter drive motor, the movement range of the side cutter can be easily altered, allowing the side cutter to have multiple different movement amplitudes to meet various cutting needs, especially enabling effective cutting of thicker sewing materials. On the other hand, the initial operating angle of the cutter drive motor relative to the needle drive source is adjustable, thus facilitating the switching between synchronous and asynchronous operation of the side cutter and the needle bar, achieving synchronous and asynchronous adjustment, and reducing operating costs. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the sewing machine in this application.

[0023] Figure 2 This is a schematic diagram of the side-cutting mechanism in this application.

[0024] Figure 3 This is a schematic diagram of the structure of the first transmission component in this application.

[0025] Figure 4 and Figure 5 These are schematic diagrams of the second transmission component in this application from different perspectives.

[0026] Figure 6 This is a schematic diagram of the side cutter in this application.

[0027] Figure 7 This is a schematic diagram of the operating principle of the first transmission component in this application.

[0028] Figure 8 This is a force analysis diagram of the first transmission component in this application.

[0029] Component designation explanation

[0030] 10 needle plate

[0031] 20 Side-cutting blades

[0032] 21 U-shaped groove

[0033] 22. Cutter arm

[0034] 30 Cutter Drive Motor

[0035] 40 Cutting blade pivot

[0036] 51 First transmission crank

[0037] 52 First transmission link

[0038] 53 Second transmission crank

[0039] 61 Third transmission crank

[0040] 62 Second transmission link

[0041] 63 Fixed slide rail

[0042] 64 Transmission slider

[0043] 65 Cutting Shaft

[0044] 66 Connecting Columns

[0045] 661 First Shaft

[0046] 67 Drive bracket handle

[0047] 68 Cutting knife holder

[0048] 681 shaft hole

[0049] 682 Guide rod hole

[0050] 69 Fixed bushing

[0051] 610 Tool Holder Shaft

[0052] 611 Tool Holder Guide Rod

[0053] 612 Cutting Holder

[0054] 613 Install pressure plate

[0055] 614 Adjustable long slot

[0056] 615 retaining ring

[0057] 70 casing

[0058] 80 base plate

[0059] 90 spindle Detailed Implementation

[0060] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0061] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and objectives of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0062] This invention provides a sewing machine, and more particularly a side-cutting mechanism for a sewing machine. In this embodiment, the sewing machine is a flatbed sewing machine, such as... Figure 1 As shown, the sewing machine has a housing 70, a base plate 80, a needle plate 10 fixed on the base plate 80, a main shaft 90 rotatably supported in the housing 70 via a bushing, a needle bar mechanism, and a main motor that drives the main shaft 90 to rotate. The housing 70 is fixedly mounted on the base plate 80. For ease of description, the axial direction of the main shaft 90 is defined as the left direction, and the end of the main shaft 90 facing the needle bar mechanism is the left end. Figure 1 and Figure 2 As shown, the needle bar mechanism is mounted on the left end of the main shaft 90 and is connected to the main shaft 90 in a transmission manner. The needle bar mechanism has a needle that moves up and down reciprocally. Therefore, the power for the needle to move up and down reciprocally comes from the main shaft 90. The main shaft 90 is driven by the main motor. Therefore, the main motor is also the needle drive source for driving the needle to move up and down reciprocally in the sewing machine.

[0063] Furthermore, such as Figure 1 and Figure 2As shown, the side-cutting mechanism involved in this application includes a side-cutting blade 20 disposed on the right side of the needle plate 10 in a sewing machine, a cutting blade drive motor 30, and a cutting blade transmission assembly. The cutting blade drive motor 30 is fixedly installed at the right end of the sewing machine housing 70. The cutting blade drive motor 30 is connected to the side-cutting blade 20 through the cutting blade transmission assembly and drives the side-cutting blade 20 to move up and down reciprocally, thereby realizing the up-and-down movement of the side-cutting blade 20 for cutting the material. In particular, the cutting blade drive motor 30 is independent of the needle drive source. Therefore, this application uses an independent cutting blade drive motor 30 as the drive source for the up-and-down reciprocating movement of the side-cutting blade 20, which is separate from the needle drive source, so that the up-and-down reciprocating movement of the side-cutting blade 20 is independent of the up-and-down reciprocating movement of the needle.

[0064] The side-cutting mechanism in this application uses an independent cutter drive motor 30 as the drive source. On the one hand, by changing the operating range of the cutter drive motor 30, the movement range of the side-cutting blade 20 can be easily changed, allowing the side-cutting blade 20 to have multiple different movement amplitudes. This enables free adjustment of the working height of the side-cutting blade 20, meeting various cutting needs, especially for effectively cutting thicker fabrics such as needle tips. On the other hand, the initial operating angle of the cutter drive motor 30 relative to the needle drive source is adjustable, thus facilitating the switching between synchronous and asynchronous operation of the side-cutting blade 20 and the needle bar, achieving synchronous and asynchronous adjustment and reducing operating costs. Furthermore, by controlling the cutter drive motor 30 to operate outside the working angle range, the side-cutting blade 20 is lifted away from the cutting working area through the cutter transmission assembly, achieving separation of the side-cutting blade 20. If resetting is required, the cutter drive motor 30 is controlled to operate within the working angle range, and the side-cutting blade 20 is reset to the cutting working area through the cutter transmission assembly. This achieves the engagement and disengagement of the side-cutting blade 20, meeting different sewing needs.

[0065] Furthermore, such as Figure 2 As shown, the cutter transmission assembly includes a cutter swing shaft 40 rotatably supported in the sewing machine housing 70 via a bushing, a first transmission assembly connected between the cutter drive motor 30 and the right end of the cutter swing shaft 40, and a second transmission assembly connected between the left end of the cutter swing shaft 40 and the side cutter 20. The cutter swing shaft 40 is parallel to the main shaft 90.

[0066] The preferred structure of the first transmission component is as follows: Figure 2 and Figure 3 As shown, the first transmission assembly includes a first transmission crank 51, a first transmission connecting rod 52, and a second transmission crank 53. The first transmission crank 51 is fixedly locked to the motor shaft of the cutter drive motor 30 by screws, and the second transmission crank 53 is fixedly locked to the cutter swing shaft 40 by screws. One end of the first transmission connecting rod 52 is hinged to the first transmission crank 51 by a left-right extending transmission pin, and the other end of the first transmission connecting rod 52 is hinged to the second transmission crank 53 by a left-right extending transmission pin.

[0067] The preferred structure of the second transmission component is as follows: Figure 2 , Figure 4 and Figure 5 As shown, the second transmission assembly includes a third transmission crank 61, a second transmission connecting rod 62, a fixed slide rail 63, a transmission slider 64, a cutter shaft 65, a connecting post 66, a drive bracket handle 67, and a cutter seat 68. The third transmission crank 61 is fixedly locked to the cutter swing shaft 40 by screws, and the upper ends of the third transmission crank 61 and the second transmission connecting rod 62 are hinged by left-right extending shaft screws. The fixed slide rail 63 is fixed to the sewing machine housing 70 by screws, and a vertically extending groove is provided on the left end face of the fixed slide rail 63. The transmission slider 64 is assembled in the groove and slides in cooperation with it. The cutter shaft 65 extends vertically and is movable vertically within the sewing machine housing 70, and the connecting post 66 is fixedly locked by screws. At the upper end of the cutter shaft 65, a first shaft portion 661 extending straight to the right is provided on the right end side of the connecting post 66. The first shaft portion 661 is rotatably fitted through the lower end of the second transmission link 62 and the transmission slider 64, realizing the transmission connection between the second transmission link 62, the transmission slider 64, the connecting post 66, and the cutter shaft 65. The drive bracket handle 67 is fixed to the lower end of the cutter shaft 65. The fixing method can be that the drive bracket handle 67 is tightly fitted into the lower end of the cutter shaft 65. A second shaft portion extending straight to the left is provided on the left side of the drive bracket handle 67. The second shaft portion is inserted into the cutter holder 68, realizing the transmission connection between the cutter shaft 65, the drive bracket handle 67, and the cutter holder 68. The side cutter 20 is mounted on the cutter holder 68. Preferably, the first shaft portion 661 extends integrally from the connecting post 66, and the second shaft portion is composed of a transmission pin that extends laterally and is fixed in the drive bracket handle 67.

[0068] Furthermore, during the operation of the side-cutting mechanism, such as Figure 7 As shown, the motor shaft of the cutter drive motor 30 reciprocates within the working angle range. The cutter drive motor 30 drives the first transmission crank 51 to swing synchronously, which in turn drives the second transmission crank 53 to swing through the first transmission connecting rod 52. The cutter swing shaft 40 and the third transmission crank 61 swing together with the second transmission crank 53. Under the action of the second transmission connecting rod 62, the fixed slide rail 63 and the transmission slider 64, the connecting column 66 is driven to move up and down, restricting the radial movement of the connecting column 66 so that the connecting column 66 can only move up and down. The cutter shaft 65 and the drive bracket handle 67 move up and down together with the connecting column 66. The drive bracket handle 67 then drives the cutter seat 68 and the side cutter 20 to move up and down together, realizing the reciprocating up and down movement of the side cutter 20. When the side cutter 20 moves down to the lowest position, it performs the cutting action.

[0069] Preferably, such as Figure 4 and Figure 5As shown, the second transmission assembly also includes a fixed bushing 69, a cutter shaft 610, and a cutter guide rod 611, all fixed to the sewing machine housing 70. The cutter shaft 65 is movably inserted into the fixed bushing 69 and is movably mounted in the sewing machine housing 70 via the fixed bushing 69. The cutter holder 68 has a shaft hole 681 that slides with the cutter shaft 610 and a guide rod hole 682 that slides with the cutter guide rod 611. Both the shaft hole 681 and the guide rod hole 682 extend axially in the vertical direction. Through the sliding fit between the cutter shaft 610 and the shaft hole 681, and the sliding fit between the cutter guide rod 611 and the guide rod hole 682, the stability of the cutter holder 68's vertical movement can be improved, thereby improving the stability of the side cutter 20's vertical movement and ultimately improving the cutting quality. A retaining ring 615 is fixed to the cutter swing shaft 40 by screws. The retaining ring 615 and the third transmission crank 61 abut against the right end and left end of the bushing, respectively, thereby axially limiting the cutter swing shaft 40 and restricting its axial movement, but without affecting its radial rotation.

[0070] Furthermore, such as Figure 5 As shown, the second transmission assembly also includes a cutter holder 612 and a mounting plate 613. The cutter holder 612 has an adjusting slot 614 that extends horizontally along the parallel direction of the needle plate 10 and the side cutter 20. The cutter holder 612 is fixed to the cutter seat 68 by fixing screws passing through the adjusting slot 614. The mounting plate 613 is fixed to the cutter holder 612 by fixing screws, and the side cutter 20 is clamped between the mounting plate 613 and the cutter holder 612. This allows adjustment of the left and right mounting position of the cutter holder 612 on the cutter seat 68, thereby adjusting the position of the side cutter 20 in the left and right direction, flexibly meeting different cutting conditions. Furthermore, as... Figure 6 As shown, the upper section of the side cutter 20 has a U-shaped groove 21, with the upper end of the U-shaped groove 21 extending upwards through the side cutter 20. The side cutter 20 has cutter arms 22 on both the front and rear sides of the U-shaped groove 21. Fixing screws that secure the mounting plate 613 and the cutter holder 612 are inserted into the U-shaped groove 21 of the side cutter 20, clamping the cutter arms 22 between the mounting plate 613 and the cutter holder 612. This facilitates the fixing of the side cutter 20 and allows for easy adjustment of its vertical mounting position, flexibly meeting different cutting conditions.

[0071] Furthermore, such as Figure 7As shown, during the cutting process of the side cutting mechanism, the two ends of the working angle zone of the cutting drive motor 30 are the first angle and the second angle, respectively, and the middle angle of the working angle zone is the third angle. When the cutting drive motor 30 rotates to the first angle and the second angle, the cutting drive motor 30 drives the side cutting blade 20 to move up to the highest position through the cutting drive assembly. When the cutting drive motor 30 rotates to the third angle, the first transmission crank 51 and the first transmission connecting rod 52 are collinear, that is, the motor shaft center O1 of the cutting drive motor 30, the hinge center O2 of the first transmission crank 51 and the first transmission connecting rod 52, and the hinge center O3 of the first transmission connecting rod 52 and the second transmission crank 53 are collinear. The cutting drive motor 30 drives the side cutting blade 20 to move down to the lowest position through the cutting drive assembly. This position is defined as the dead point position of the side cutting mechanism. In this way, the motor shaft of the cutter drive motor 30 swings for one cycle. For example, the motor shaft of the cutter drive motor 30 swings from the first angle to the second angle and then swings back to the first angle. Within this cycle, the cutter drive motor 30 drives the side cutter 20 to move up and down twice through the cutter transmission assembly, so that the side cutter 20 performs two downward cutting actions, thereby reducing the workload of the cutter drive motor 30 and improving the service life of the cutter drive motor 30.

[0072] In addition, such as Figure 8 As shown, when the side-cutting mechanism is in a position other than the dead position, the motor shaft of the cutter drive motor 30 and the first transmission crank 51 are in a position where... Figure 8 At position E, the force transmitted from the side cutting blade 20 at the end of the cutting process is ultimately transmitted to the motor shaft of the cutting blade drive motor 30 along the direction of the first transmission link 52. According to the force triangle decomposition, the three sides of the force triangle are the resultant force F, the component force H, and the torque required by the motor shaft of the cutting blade drive motor 30, which is 'a'. When the motor shaft of the cutting blade drive motor 30 swings from position E to the dead point position, the force triangle gradually shrinks, and the torque 'a' of the motor shaft of the cutting blade drive motor 30 also gradually decreases until it theoretically shrinks to zero at the dead point position. The dead point position corresponds to the lowest position of the side cutting blade 20. Therefore, during the cutting process, as the side cutting blade 20 moves downward to cut the material, the torque 'a' of the motor shaft of the cutting blade drive motor 30 gradually decreases until it reaches the theoretical value of zero. Thus, the torque 'a' of the motor shaft of the cutting blade drive motor 30 is minimized during cutting, achieving the minimization of cutting torque and enabling it to handle fabrics of different thicknesses.

[0073] Furthermore, the side-cutting mechanism also includes an electronic control module and an operation panel. Both the cutter drive motor 30 and the operation panel are communicatively connected to the electronic control module. Various commands can be input through the operation panel, and the electronic control module controls the cutter drive motor 30 to perform corresponding actions according to the commands, thereby realizing various functions, such as the electronic clutch of the side-cutting blade 20, the free adjustment of the working height of the side-cutting blade 20, and the electronic adjustment of synchronous and asynchronous operation. The functions are described in detail below.

[0074] Electronic clutch of side cutter 20: When the side cutter mechanism needs to disengage the cutter, the user only needs to set the electronic control parameters or trigger the operation panel button. The electronic control module controls the cutter drive motor 30 to swing from the current angle to an angle outside the adjacent working angle range and maintain it, for example... Figure 7 In the view shown, the cutter drive motor 30 rotates counterclockwise from the current first angle α1, or clockwise from the current second angle α2, causing the side cutter 20 to lift away from the cutting working area, thus separating the side cutter 20. Afterwards, if the side cutter 20 needs to be reset, the user only needs to set the electronic control parameters or trigger the button on the operation panel. The electronic control module then controls the cutter drive motor 30 to reset, automatically swinging to the first or second angle, entering the starting point of the working angle area. This achieves electronic clutch engagement of the side cutter 20.

[0075] The working height of the side cutter 20 is freely adjustable: When the working height of the side cutter 20 is insufficient, it cannot effectively cut thicker materials such as stalks. In this case, the working angle range of the cutter drive motor 30 can be adjusted via the control panel to increase the working angle range. Figure 7 In the view shown, the first angle α1 and the second angle α2 of the original working angle zone α are changed to the first angle θ1 and the second angle θ2 of the adjusted working angle zone θ, which causes the swing angle of the first transmission crank 51 to increase, and thus increases the working range height of the side cutter 20, thereby increasing the cutting working range height and achieving effective cutting of thicker materials such as sprues.

[0076] Synchronous and asynchronous electronic adjustment: When the sewing machine needle plunges downwards into the fabric from the upper needle position, the cutter drive motor 30 starts operating from the first or second angle, driving the side cutter 20 to move downwards from its highest position. This ensures that the side cutter 20 cuts downwards simultaneously with the needle, making the needle and side cutter 20 synchronous. Conversely, when the sewing machine needle plunges downwards into the fabric from the upper needle position, the cutter drive motor 30 starts operating from the third angle, driving the side cutter 20 to move upwards from its lowest position. The side cutter 20 separates from the fabric, ensuring that the side cutter 20 moves upwards simultaneously with the needle, making the needle and side cutter 20 asynchronous. Therefore, the starting angle of the cutter drive motor 30 can be adjusted via the control panel buttons to achieve synchronous and asynchronous adjustment of the needle and side cutter 20, making operation very convenient.

[0077] In summary, this invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0078] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A side-cutting knife mechanism, comprising a side-cutting knife (20) disposed on the side of the needle plate (10) in a sewing machine, characterized in that: It also includes a cutter drive motor (30) and a cutter transmission assembly. The cutter drive motor (30) is connected to the side cutter (20) through the cutter transmission assembly and drives the side cutter (20) to move up and down reciprocally. The cutter drive motor (30) is independent of the needle drive source in the sewing machine that drives the needle to move up and down reciprocally. The cutter transmission assembly includes a cutter swing shaft (40) rotatably supported in the sewing machine housing (70), a first transmission assembly connected between the cutter drive motor (30) and the cutter swing shaft (40), and a second transmission assembly connected between the cutter swing shaft (40) and the side cutter (20). The first transmission assembly includes a first transmission crank (51) fixed on the motor shaft of the cutter drive motor (30), a first transmission connecting rod (52), and a second transmission crank (53) fixed on the cutter swing shaft (40). The two ends of the first transmission connecting rod (52) are respectively hinged to the first transmission crank (51) and the second transmission crank (53). During the operation of the side cutting mechanism, the motor shaft of the cutting drive motor (30) oscillates back and forth within the working angle range. The two ends of the working angle range are the first angle and the second angle, respectively, and the middle angle of the working angle range is the third angle. When the cutting drive motor (30) operates to the first angle and the second angle, the side cutting blade (20) moves to the highest position. When the cutting drive motor (30) operates to the third angle, the first transmission crank (51) and the first transmission connecting rod (52) are collinear. At this time, the cutting blade... The motor shaft center O1 of the blade drive motor (30), the hinge center O2 of the first transmission crank (51) and the first transmission connecting rod (52), and the hinge center O3 of the first transmission connecting rod (52) and the second transmission crank (53) are collinear. When the side cutter (20) moves down to the lowest position, the blade drive motor (30) drives the side cutter (20) to move up and down twice through the blade transmission assembly, so that the side cutter (20) performs two downward cutting actions. The side-cutting mechanism also includes an electronic control module and an operation panel. The cutter drive motor (30) and the operation panel are both connected to the electronic control module. By inputting commands through the operation panel, the electronic control module controls the cutter drive motor (30) to perform the following actions according to the commands: When the side cutting mechanism performs the cutting separation action, the electronic control module controls the cutting drive motor (30) to swing from the current angle to an angle outside the adjacent working angle area and maintain it, so that the side cutting blade (20) is lifted away from the cutting working area, realizing the separation of the side cutting blade (20); when the side cutting blade (20) is reset, the electronic control module controls the cutting drive motor (30) to swing to the first angle or the second angle, entering the starting point of the working angle area; When the side cutter mechanism performs the action of freely adjusting the working height, the range of the working angle zone of the cutter drive motor (30) can be adjusted through the operation panel, and the first angle and the second angle of the working angle zone can be adjusted to change the working range height of the side cutter (20); When the side-cutting mechanism performs synchronous and asynchronous electronic adjustment, the electronic control module adjusts the starting angle of the cutter drive motor (30); when the sewing machine needle is piercing the fabric from the upper needle position, if the cutter drive motor (30) starts running from the first angle or the second angle, it drives the side-cutting blade (20) to move downward from the highest position so that the needle and the side-cutting blade (20) are synchronized, so that the side-cutting blade (20) cuts the fabric downward when the needle is piercing the fabric; if the cutter drive motor (30) starts running from the third angle, it drives the side-cutting blade (20) to move upward from the lowest position so that the needle and the side-cutting blade (20) are asynchronous, so that the side-cutting blade (20) moves upward when the needle is piercing the fabric downward.

2. The side-cutting mechanism according to claim 1, characterized in that: The second transmission assembly includes a third transmission crank (61) fixed on the cutter swing shaft (40), a second transmission connecting rod (62) with one end hinged to the third transmission crank (61), a fixed slide rail (63) with a vertically extending slide groove, a transmission slider (64) slidably engaged with the slide groove, a vertically extending cutter shaft (65), a connecting post (66) fixed on the upper end of the cutter shaft (65), a drive bracket handle (67) fixed on the lower end of the cutter shaft (65), and a cutter seat (68). The connecting post (66) is provided with a first shaft portion (661), which is rotatably engaged in the other end of the second transmission connecting rod (62) and the transmission slider (64). The drive bracket handle (67) is provided with a second shaft portion, which is inserted into the cutter seat (68). The side cutter (20) is mounted on the cutter seat (68).

3. The side-cutting mechanism according to claim 2, characterized in that: The second transmission assembly also includes a fixed bushing (69) fixed in the sewing machine housing (70), and the cutter shaft (65) is movably inserted in the fixed bushing (69).

4. The side-cutting mechanism according to claim 2, characterized in that: The second transmission assembly also includes a knife holder shaft (610) and a knife holder guide rod (611) both fixed to the sewing machine housing (70). The cutter holder (68) has a shaft hole (681) that slides with the knife holder shaft (610) and a guide rod hole (682) that slides with the knife holder guide rod (611).

5. The side-cutting mechanism according to claim 2, characterized in that: The second transmission assembly also includes a cutter holder (612) and a mounting plate (613). The cutter holder (612) has an adjustment slot (614) that extends straight along the parallel direction of the needle plate (10) and the side cutter (20). The cutter holder (612) is fixed to the cutter seat (68) by fixing screws that pass through the adjustment slot (614). The mounting plate (613) is fixed to the cutter holder (612) by fixing screws. The side cutter (20) is clamped between the mounting plate (613) and the cutter holder (612).

6. A sewing machine, characterized in that: The sewing machine is equipped with a side-cutting mechanism as described in any one of claims 1-5.

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