A cloth feeding mechanism of a sewing machine and a sewing machine

Abstract

The present invention relates to the technical field of sewing machines, and discloses a sewing machine feeding mechanism and a sewing machine, including a needle plate and an operating cover plate, and also including a feed tooth arranged at the lower side of the needle plate, the feed tooth being arranged on a first driving assembly; the first driving assembly being arranged on a lifting assembly; a second driving assembly being arranged at the lower side of the operating cover plate, the second driving assembly being telescopically arranged, and being used to drive the second driving assembly to extend to the upper part of the needle plate when the operating cover plate slides open, and a control unit being further arranged on the second driving assembly, and being used to drive the control unit to control the first driving assembly to drive the feed tooth to extend through the needle plate when the operating cover plate slides open. By driving the operating cover plate to slide away from the needle plate to open the operating port, the second driving assembly can automatically extend the operating port to the upper part of the needle plate, so that the operator can adjust the distance of the feed tooth extending out of the slot hole, and the operation is simple and convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of sewing machines, in particular to a cloth feeding mechanism of a sewing machine and a sewing machine. Background Art

[0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the sewing material, so that one or more layers of sewing materials are interwoven or sewn together. A sewing machine is mainly composed of four parts: a machine head, a machine base, a transmission and accessories. Among them, the machine head is the main part of the sewing machine, which consists of mechanisms such as piercing the material, hooking the thread, picking up the thread, feeding the material, winding the thread, pressing the material and dropping the teeth.

[0003] The feeding device on the existing sewing machine includes a main shaft, which is connected to a tooth lifting mechanism through a driving mechanism. A cloth feeding mechanism is installed on the output end of the tooth lifting mechanism. The main shaft realizes the conveying of cloth by cooperating with the driving mechanism, the tooth lifting mechanism and the cloth feeding mechanism.

[0004] For example, a sewing machine cloth feeding mechanism and a sewing machine disclosed in the Chinese invention patent with announcement number CN113957620B optimize the structure, position and transmission mode of the cloth feeding transmission unit and the lifting tooth transmission unit, improve the accuracy of the cloth feeding trajectory, and can adjust the stitch length in a fast and convenient manner; however, when the stitch length is actually adjusted, since the cloth feeding tooth component, the swing feeding assembly and the lifting tooth transmission assembly and other structures are installed inside the sewing machine, when adjusting them, it is necessary to open the inside of the sewing machine and then use special tools to adjust the internal spacing part, which is troublesome to operate and requires repeated debugging, which is time-consuming and labor-intensive, affecting the normal operation of the sewing machine. Summary of the invention

[0005] The object of the present invention is to provide a sewing machine cloth feeding mechanism and a sewing machine to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A cloth feeding mechanism of a sewing machine comprises a needle plate and an operating cover slidably arranged on one side of the needle plate, and further comprises a cloth feeding tooth arranged at the lower side of the needle plate, wherein the cloth feeding tooth is arranged on a first driving assembly, and the first driving assembly is used to drive the cloth feeding tooth to perform cloth feeding operation; the first driving assembly is arranged on a lifting assembly, and the lifting assembly is used to adjust the height of the cloth feeding tooth extending through the needle plate;

[0008] A second driving assembly for driving the lifting assembly is provided at the bottom of the operating cover. The second driving assembly is retractable. When the operating cover slides open, it is used to drive the second driving assembly to extend to the top of the needle plate. A control unit is also provided on the second driving assembly. When the operating cover slides open, it is used to drive the control unit to control the first driving assembly to drive the feed dog to extend through the needle plate.

[0009] Furthermore, the first driving component includes a mounting seat, in which a retractable lifting rod with an upper end extending out is provided, and a mounting plate is provided at the extending end of the lifting rod. A groove is provided along the length direction of one side of the mounting plate, and a moving block is slidably provided in the groove. The feed dog is installed on the moving block through a mounting member, and a driving member for driving the moving block to perform an elliptical motion is provided on the mounting seat.

[0010] Furthermore, a horizontal groove is provided on the side wall of the groove along its length direction, and a vertical groove is provided on the moving block along the width direction of the mounting plate; the driving member includes a first support plate arranged on the mounting seat, a motor is provided on the first support plate, a swing rod is provided on the output shaft of the motor, a first sliding column penetrating the horizontal groove is provided on the swing rod, and a second sliding column penetrating the vertical groove is provided on the first sliding column through a connecting plate.

[0011] Furthermore, the lifting assembly includes a lifting box, a moving seat which is located in the lifting box and can be lifted and lowered is provided at the lower end of the mounting seat, mounting columns which extend through the lifting box are provided at the four corners of the moving seat, a first spring which pushes the moving seat downward is provided on the mounting columns, a guide slope is provided on the lower side wall of the moving seat, a T-shaped slider is provided on the guide slope, a slidable driving block is provided in the lifting box, a T-shaped slide groove is provided on the upper end of the driving block for the T-shaped slider to slide into, and a second driving assembly is used to drive the driving block to move to realize the lifting and lowering of the moving seat.

[0012] Furthermore, the second drive component includes a screw rod rotatably arranged in the lifting box, and the screw rod thread passes through the driving block; the second drive component also includes an installation box, one end of the screw rod extends into the installation box, and the protruding end of the screw rod is provided with a first bevel gear. A rotatable rotating rod is provided in the installation box, and a second bevel gear meshing with the first bevel gear is provided on the rotating rod. The upper end of the rotating rod passes through the installation box and protrudes.

[0013] Furthermore, a lifting and lowering rotating cylinder is sleeved on the protruding end of the rotating rod, a second support plate is provided on one side of the installation box, a rotating plate is rotatably sleeved outside the rotating cylinder, a connecting column is provided on the rotating plate that passes through the second support plate, a second spring for driving the rotating plate to move downward is sleeved on the connecting column, a guide block is provided on the protruding end of the connecting column, a guide slot is provided on the guide block, a guide slide rod is provided on the lower side surface of the operating cover plate, and the movement of the operating cover plate is used to drive the guide slide rod to slide into the guide slot to realize the upward movement of the guide block.

[0014] Furthermore, a mounting groove is provided on the guide block corresponding to the rotating cylinder; the control unit includes a trigger switch arranged in the mounting groove and electrically connected to the motor, and the operation cover plate is moved to drive the guide slide rod to slide into the guide slide groove to trigger the trigger switch, and the trigger switch is used to control the motor to make the swing rod rotate to the highest point.

[0015] Furthermore, the lower end of the rotating cylinder extends outward to form a limiting portion for overlapping the rotating plate, and the external thread of the rotating cylinder is connected to a locking nut for limiting the rotating plate on the limiting portion.

[0016] The present invention also provides a sewing machine, comprising a machine body, a machine base and a machine head arranged on the machine base. The machine base and the machine head can be flipped and arranged on the upper side of the machine body. A cloth feeding mechanism is provided in the machine body and below the machine base. The cloth feeding mechanism adopts the above-mentioned cloth feeding mechanism.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention can drive the moving block to make an elliptical motion through a motor, thereby driving the feed tooth to make an elliptical motion, so as to realize the conveyance of the cloth on the needle plate. Compared with the existing spindle driving method, the present invention can make the cloth feeding mechanism have a variety of movement frequencies through motor driving to improve its applicability.

[0019] 2. The present invention drives the operating cover plate to slide away from the needle plate to open the operating port, so that the rotating cylinder can be extended from the operating port. Therefore, it is convenient for the operator to rotate the rotating cylinder to drive the rotating rod to rotate, and then the driving block moves in the lifting box, and the lifting of the movable seat is adjusted, so as to better adjust the distance that the feed dog extends out of the slot hole to cooperate with the presser foot set on the sewing machine head, so that the feed mechanism can transport fabrics of different thicknesses.

[0020] 3. The present invention, through the setting of the control unit, makes it possible for when the operating cover is driven to slide away from the needle plate to open the operating port, the control unit can automatically control the motor to drive the swing arm to rotate, thereby making the feed dog in a state of extending to the highest point through the slot hole, that is, it is convenient for the operator to observe the height adjustment of the feed dog on the upper side of the machine base when adjusting through the second drive assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a partial structural schematic diagram of a sewing machine in the present invention.

[0022] Figure 2 It is a structural schematic diagram of the cloth feeding mechanism installed below the needle plate and the operating cover plate in the present invention.

[0023] Figure 3 This is one of the structural schematic diagrams of the cloth feeding mechanism in the present invention.

[0024] Figure 4 This is the second structural schematic diagram of the cloth feeding mechanism in the present invention.

[0025] Figure 5 It is a schematic diagram of the structure of the first driving component in the present invention.

[0026] Figure 6 It is a cross-sectional schematic diagram of the cloth feeding mechanism in the present invention.

[0027] Figure 7 It is a schematic diagram of the structure of the second driving assembly below the operating cover plate in the present invention.

[0028] Figure 8 It is a partial structural schematic diagram of the second driving component in the present invention.

[0029] Fig. 9 It is a control principle diagram of the control unit in the present invention.

[0030] The meanings of the numbers in the figure are as follows: 10, needle plate; 20, operating cover; 30, machine base; 31, machine head; 210, feed dog; 220, lifting assembly; 230, second drive assembly; 310, mounting seat; 311, first support plate; 320, mounting plate; 321, horizontal groove; 330, motor; 331, swing rod; 340, lifting box; 350, screw rod; 360, mounting box; 361, second support plate; 370, rotating rod; 380, rotating cylinder; 390, guide block; 401, groove; 410, lifting rod ; 420, moving block; 501, vertical groove; 510, first sliding column; 520, connecting plate; 521, second sliding column; 530, moving seat; 531, guiding slope; 532, T-shaped slider; 540, mounting column; 550, first spring; 601, cavity; 610, driving block; 611, first bevel gear; 721, second bevel gear; 810, rotating plate; 820, second spring; 830, guiding slide bar; 901, mounting groove; 902, trigger switch; 911, inclined groove portion; 912, horizontal groove portion. DETAILED DESCRIPTION

[0031] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments are only for explaining the present invention and are not intended to limit it.

[0032] The following is combined with Figure 1-Figure 9 This embodiment is described in further detail.

[0033] like Figure 2As shown, a cloth feeding mechanism of a sewing machine in this embodiment includes a needle plate 10 and an operating cover 20 slidably arranged on one side of the needle plate 10, and also includes a cloth feeding tooth 210 arranged at the lower side of the needle plate 10, the cloth feeding tooth 210 is arranged on the first driving component, and the first driving component is used to drive the cloth feeding tooth 210 to perform cloth feeding operation; the first driving component is arranged on the lifting component 220, and the lifting component 220 is used to adjust the height of the cloth feeding tooth 210 extending through the needle plate 10;

[0034] A second driving assembly 230 for driving the lifting assembly 220 is provided at the bottom of the operating cover 20. The second driving assembly 230 is retractable. When the operating cover 20 slides open, it is used to drive the second driving assembly 230 to extend to the top of the needle plate 10. A control unit is also provided on the second driving assembly 230. When the operating cover 20 slides open, it is used to drive the control unit to control the first driving assembly to drive the feed dog 210 to be in a state of extending through the needle plate 10.

[0035] In actual use, the sewing machine cloth feeding mechanism is installed in the sewing machine, wherein the cloth feeding mechanism is combined with the sewing machine. Figure 2 and Figure 3 As shown, in this embodiment, the needle plate 10 is detachably mounted on the upper side of the machine base 30, and the operating cover 20 is slidably mounted on the upper side of the machine base 30 at one side of the needle plate 10. The operating cover 20 slides away from the needle plate 10 so that the upper side of the machine base 30 forms an operating port connected to the inside of the sewing machine, thereby facilitating the inspection and maintenance of the cloth feeding mechanism installed in the sewing machine through the operating port;

[0036] The needle plate 10 is provided with a slot for the feed dog 210 to extend out. When it is actually used, the first driving assembly is used to drive the feed dog 210 to make an elliptical motion so that the extended end of the feed dog 210 can transport the fabric backwards.

[0037] Among them, by setting the lifting assembly 220, it is possible to adjust the height of the first driving assembly, and then adjust the distance that the feed dog 210 extends out of the slot to cooperate with the presser foot set on the sewing machine head 31, so that the feed mechanism can transport fabrics of different thicknesses;

[0038] Among them, through the setting of the second driving assembly 230, when the operating cover 20 slides away from the needle plate 10 in actual use, the second driving assembly 230 can automatically extend the operating port to the upper part of the needle plate 10, thereby preferably facilitating the operator to drive the lifting assembly 220 to work through the second driving assembly 230 to adjust the distance that the feed dog 210 extends out of the slot;

[0039] In the present embodiment, since the first driving assembly drives the feed dog 210 to make an elliptical remote movement, the position of the feed dog 210 is not fixed when it stops, that is, the feed dog 210 is located inside the sewing machine when it stops. Therefore, it is difficult for the operator to observe the distance for adjusting the height of the feed dog 210 by driving the second driving assembly 230, thereby affecting the adjustment effect of the second driving assembly 230. In the present embodiment, through the setting of the control unit, when it is actually used, when the operating cover 20 slides away from the needle plate 10, the control unit can drive the first driving assembly to drive the feed dog 210 to be in a state of extending to the highest point through the slot hole, that is, it is convenient for the operator to observe the height adjustment of the feed dog 210 on the upper side of the machine base 30 when adjusting through the second driving assembly 230.

[0040] Combination Figure 2-4 As shown, in this embodiment, the first driving component includes a mounting seat 310, a telescopic lifting rod 410 extending from the upper end is provided in the mounting seat 310, a mounting plate 320 is provided at the extending end of the lifting rod 410, a groove 401 is provided on one side of the mounting plate 320 along its length direction, a moving block 420 is slidably provided in the groove 401, the feed dog 210 is installed on the moving block 420 through a mounting member, and a driving member for driving the moving block 420 to perform an elliptical motion is provided on the mounting seat 310.

[0041] In actual use of this embodiment, the mounting plate 320 is arranged along the length direction of the feed dog 210, and the feed dog 210 is slidably mounted on the upper side wall of the mounting plate 320;

[0042] The mounting member includes a mounting portion 431 disposed on the lower side wall of the feed dog 210, the mounting portion 431 extends to the moving block 420, and is mounted on the moving block 420 by a countersunk bolt;

[0043] The groove 401 has sliding grooves on its opposite side walls along its length direction, and the moving block 420 has sliding blocks extending into the corresponding sliding grooves on its side walls, thereby realizing the sliding installation of the moving block 420 in the groove 401, wherein, in conjunction with the telescopic setting of the lifting rod 410 in the mounting seat 310, the driving member can drive the moving block 420 to make an elliptical motion, even if the feed dog 210 makes an elliptical motion, thereby conveying the cloth;

[0044] Combination Figure 6 As shown, a cavity 601 is provided in the mounting seat 310 for the lifting rod 410 to extend into, wherein the side wall of the lifting rod 410 is slidably fitted with the side wall of the cavity 601 , thereby achieving the lifting installation of the lifting rod 410 in the mounting seat 310 .

[0045] Combination Figure 2-5As shown, in this embodiment, the side wall of the groove 401 is provided with a horizontal groove 321 along its length direction, and the moving block 420 is provided with a vertical groove 501 along the width direction of the mounting plate 320; the driving member includes a first support plate 311 arranged on the mounting seat 310, a motor 330 is provided on the first support plate 311, a swing rod 331 is provided on the output shaft of the motor 330, a first sliding column 510 penetrating the horizontal groove 321 is provided on the swing rod 331, and a second sliding column 521 penetrating the vertical groove 501 is provided on the first sliding column 510 through the connecting plate 520.

[0046] In this embodiment, the swing rod 331 is arranged in parallel with the connecting plate 520, so that the two are on the same axis. Through the above-mentioned structure, in actual use, the motor 330 drives the swing rod 331 to rotate, so that the first sliding column 510 slides in the horizontal groove 321, and the mounting plate 320 is reciprocated. At the same time, the connecting plate 520 is driven to rotate, so that the second sliding column 521 slides along the vertical groove 501, and the moving block 420 reciprocates in the groove 401. As a result, the moving block 420 makes an elliptical motion as a whole, driving the feed dog 210 thereon to make an elliptical remote motion to transport the cloth. Compared with the existing main shaft driving method, the present embodiment is driven by the motor 330 to enable the cloth feeding mechanism to have a variety of motion frequencies to improve its applicability.

[0047] In this embodiment, the lifting assembly 220 includes a lifting box 340, and the lower end of the mounting seat 310 is provided with a movable seat 530 located in the lifting box 340 and movable for lifting and lowering. The four corners of the movable seat 530 are provided with mounting columns 540 extending through the lifting box 340, and the mounting columns 540 are provided with a first spring 550 for pushing the movable seat 530 to move downward. The lower side wall of the movable seat 530 is provided with a guide slope 531, and the guide slope 531 is provided with a T-shaped slider 532. A slidable driving block 610 is provided in the lifting box 340, and the upper end of the driving block 610 is provided with a T-shaped slide groove for the T-shaped slider 532 to slide into. The second driving assembly 230 is used to drive the driving block 610 to move to realize the lifting and lowering of the movable seat 530.

[0048] In this embodiment, a nut is threadedly installed on the through end of the mounting post 540 to enable the movable seat 530 to be installed;

[0049] The T-shaped slider 532 and the T-shaped slide groove are matched to make the driving block 610 slidably connected with the lower side of the moving seat 530. Thus, through the above structure, the driving block 610 slides along the guide slope 531, so that the moving seat 530 can be lifted and lowered in the lifting box 340, and the mounting seat 310 can be lifted and lowered as a whole, so as to adjust the height of the slot through which the feed dog 210 passes.

[0050] In this embodiment, the second drive component 230 includes a screw rod 350 rotatably arranged in the lifting box 340, and the screw rod 350 is threaded through the drive block 610; the second drive component 230 also includes an installation box 360, one end of the screw rod 350 extends into the installation box 360, and the protruding end of the screw rod 350 is provided with a first bevel gear 611, and a rotatable rotating rod 370 is provided in the installation box 360, and a second bevel gear 721 meshing with the first bevel gear 611 is provided on the rotating rod 370, and the upper end of the rotating rod 370 passes through the installation box 360 and protrudes.

[0051] In actual use of this embodiment, both ends of the screw rod 350 are rotatably mounted in the lifting box 340 and the installation box 360 through bearings, thereby realizing the rotatable installation of the screw rod 350. At the same time, the rotating rod 370 is rotatably mounted on the installation box 360 through bearings.

[0052] In this embodiment, since the screw rod 350 is threaded through the drive block 610, the screw rod 350 can rotate to drive the drive block 610 to move; wherein, through the cooperative arrangement of the mounting column 540 and the first spring 550, the lifting and lowering of the moving seat 530 in the lifting box 340 is more stable;

[0053] Among them, the upper end of the rotating rod 370 extends through the installation box 360 so that its upper end is located below the operating cover 20, so that when the operating cover 20 is opened, the first bevel gear 611 and the second bevel gear 721 are engaged with each other, so that the screw rod 350 can be driven to rotate by rotating the rotating rod 370, thereby realizing the movement of the driving block 610.

[0054] In this embodiment, the protruding end of the rotating rod 370 is sleeved with a liftable rotating cylinder 380, a second support plate 361 is provided on one side of the installation box 360, a rotating plate 810 is rotatably sleeved outside the rotating cylinder 380, a connecting column is provided on the rotating plate 810 and passes through the second support plate 361, a second spring 820 for driving the rotating plate 810 to move downward is sleeved on the connecting column, a guide block 390 is provided at the protruding end of the connecting column, a guide groove is provided on the guide block 390, a guide slide bar 830 is provided on the lower side surface of the operating cover plate 20, and the movement of the operating cover plate 20 is used to drive the guide slide bar 830 to slide into the guide groove, thereby realizing the upward movement of the guide block 390.

[0055] In actual use of this embodiment, a limit block is provided on the inner wall of the rotating cylinder 380 along its height direction, and a limit groove for the limit block to slide into is provided on the outer wall of the extended end of the rotating rod 370, thereby forming a key groove fit between the two, that is, the rotation of the rotating cylinder 380 can drive the rotating rod 370 to rotate, and at the same time, the rotating cylinder 380 can be raised and lowered along the rotating rod 370;

[0056] The lower end of the rotating cylinder 380 extends outward to form a limiting portion for overlapping the rotating plate 810, and the rotating cylinder 380 is externally threaded with a locking nut for limiting the rotating plate 810 on the limiting portion, thereby realizing the rotation connection between the rotating plate 810 and the rotating cylinder 380;

[0057] Among them, combined Figure 7 and Figure 8 As shown, in this embodiment, the guide slide groove includes an inclined groove portion 911 and a horizontal groove portion 912, so that in actual use, when the operator drives the operating cover 20 to slide away from the needle plate 10, the guide slide bar 830 is driven to approach the guide block 390. During this process, the guide slide bar 830 slides along the inclined groove portion 911, thereby causing the guide block 390 to move upward, that is, the rotating cylinder 380 is driven upward by the rotating plate 810 to extend from the opened operating port, so that the operator can rotate the rotating cylinder 380. When the guide slide bar 830 slides from the inclined groove portion 911 into the horizontal groove portion 912, the guide block 390 stops moving upward at this time, so that the operating port is opened to the maximum, so that the operator can repair the cloth feeding mechanism installed inside the sewing machine; when the operator drives the operating cover 20 to slide toward the needle plate 10, the rotating cylinder 380 can be automatically retracted, thereby facilitating subsequent use.

[0058] Combination Figure 8-9 As shown, in this embodiment, a mounting groove 901 is provided on the guide block 390 corresponding to the rotating cylinder 380; the control unit includes a trigger switch 902 disposed in the mounting groove 901 and electrically connected to the motor 330, and the operation cover 20 moves to drive the guide slide bar 830 to slide into the guide slide groove to trigger the trigger switch 902, and the trigger switch 902 is used to control the motor 330 to work so that the swing rod 331 rotates to the highest point.

[0059] In this embodiment, the mounting groove 901 is used to mount the trigger switch 902. When it is actually used, when the guide slide bar 830 slides into the horizontal groove portion 912, the trigger switch 902 can be triggered. A stop plate that penetrates the mounting groove 901 is slidably arranged in the horizontal groove portion 912. When the guide slide bar 830 slides into the horizontal groove portion 912, it can press the stop plate to move the stop plate toward the trigger switch 902, thereby triggering the trigger switch 902.

[0060] Through the above-mentioned structure, when the operating cover 20 slides away from the needle plate 10 to open the operating port, it can control the motor 330 to drive the swing rod 331 to rotate to the highest point, thereby making the feed dog 210 extend to the highest point through the slot hole, so as to facilitate observation when the height of the feed dog 210 is subsequently adjusted.

[0061] In this embodiment, the control unit also includes a controller, and the trigger switch 902 is electrically connected to the motor 330 through the controller. The control unit also includes an infrared sensor, which is arranged above the first support plate 311. The infrared sensor is electrically connected to the controller. The infrared sensor is used to detect whether the swing rod 331 has rotated to the highest point. When the infrared sensor does not detect that the swing rod 331 has rotated to the highest point, at this time, the trigger switch 902 is triggered, and the controller controls the motor 330 to drive the swing rod 331 to rotate to the highest point, so that the feed dog 210 passes through the slot and extends to the highest point. When the infrared sensor detects that the swing rod 331 has rotated to the highest point, at this time, the trigger switch 902 is triggered, and the controller will not control the motor 330 to drive the swing rod 331 to rotate, even if the feed dog 210 remains in the state of passing through the slot and extending to the highest point.

[0062] like Figure 1 As shown, the present embodiment further provides a sewing machine, comprising a machine body (not shown in the figure), a machine base 30 and a machine head 31 arranged on the machine base 30, the machine base 30 and the machine head 31 can be flipped and arranged on the upper side of the machine body, and the above-mentioned cloth feeding mechanism is provided in the machine body and below the machine base 30.

[0063] The sewing machine in the present embodiment has an operation port connected to the machine body on the upper side of the machine base 30, and the needle plate 10 is detachably mounted on the upper side of the machine base 30. The operation cover 20 slides on the upper side of the machine base 30 to block the operation port, and is equipped with the above-mentioned cloth feeding mechanism, so that when the sewing machine is adjusting the height of the feed dog 210 extending through the slot, the operation port is opened by sliding the operation cover 20, and the rotating cylinder 380 automatically extends out of the operation port. The operator can adjust the height of the feed dog 210 by rotating the rotating cylinder 380, and there is no need to flip the machine base 30 and the machine head 31 to adjust the feed dog 210, so that the adjustment operation of the feed dog 210 is simple and convenient, which is beneficial to the actual use of the sewing machine.

[0064] In conclusion, the above is only a preferred embodiment of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the patent of the present invention.

Claims

1. A cloth feeding mechanism for a sewing machine, comprising a needle plate (10) and an operating cover plate (20) slidably arranged on one side of the needle plate (10), characterized in that: It also includes a feed tooth (210) disposed at the lower side of the needle plate (10), the feed tooth (210) being disposed on a first drive assembly, the first drive assembly being used to drive the feed tooth (210) to perform a feed operation; the first drive assembly being disposed on a lifting assembly (220), the lifting assembly (220) being used to adjust the height at which the feed tooth (210) extends through the needle plate (10); A second driving assembly (230) for driving the lifting assembly (220) to work is provided below the operating cover (20); the second driving assembly (230) is retractable and is used to drive the second driving assembly (230) to extend to the top of the needle plate (10) when the operating cover (20) slides open; the second driving assembly (230) is also provided with a control unit, and is used to drive the control unit to control the first driving assembly to drive the feed dog (210) to extend through the needle plate (10) when the operating cover (20) slides open; The first driving assembly comprises a mounting seat (310), a telescopic lifting rod (410) is provided in the mounting seat (310) and the lifting rod (410) extends from the upper end thereof, a mounting plate (320) is provided at the extended end of the lifting rod (410), a groove (401) is provided on one side surface of the mounting plate (320) along its length direction, a moving block (420) is slidably provided in the groove (401), the feed dog (210) is mounted on the moving block (420) via a mounting member, and a driving member for driving the moving block (420) to perform an elliptical motion is provided on the mounting seat (310); A horizontal groove (321) is provided on the side wall of the groove (401) along its length direction, and a vertical groove (501) is provided on the moving block (420) along the width direction of the mounting plate (320); the driving member comprises a first support plate (311) provided on the mounting seat (310), a motor (330) is provided on the first support plate (311), a swing rod (331) is provided on the output shaft of the motor (330), a first sliding column (510) penetrating the horizontal groove (321) is provided on the swing rod (331), and a second sliding column (521) penetrating the vertical groove (501) is provided on the first sliding column (510) via a connecting plate (520).

2. A cloth feeding mechanism for a sewing machine according to claim 1, characterized in that: The lifting assembly (220) includes a lifting box (340), a movable seat (530) located in the lifting box (340) and movable for lifting and lowering is provided at the lower end of the mounting seat (310), mounting columns (540) extending through the lifting box (340) are provided at the four corners of the movable seat (530), a first spring (550) is sleeved on the mounting column (540) for pushing the movable seat (530) to move downward, a guide slope (531) is provided on the lower side wall of the movable seat (530), a T-shaped slider (532) is provided on the guide slope (531), a slidable driving block (610) is provided in the lifting box (340), and a T-shaped slide groove for the T-shaped slider (532) to slide into is provided at the upper end of the driving block (610), and a second driving assembly (230) is used to drive the driving block (610) to move to realize the lifting and lowering of the movable seat (530).

3. A cloth feeding mechanism for a sewing machine according to claim 2, characterized in that: The second driving assembly (230) includes a screw rod (350) rotatably arranged in a lifting box (340), and the screw rod (350) is threadedly arranged through a driving block (610); the second driving assembly (230) also includes an installation box (360), one end of the screw rod (350) extends into the installation box (360), and a first bevel gear (611) is provided at the extended end of the screw rod (350), and a rotatable rotating rod (370) is provided in the installation box (360), and a second bevel gear (721) meshing with the first bevel gear (611) is provided on the rotating rod (370), and the upper end of the rotating rod (370) passes through the installation box (360) and extends out.

4. A cloth feeding mechanism for a sewing machine according to claim 3, characterized in that: The protruding end of the rotating rod (370) is sleeved with a lifting rotating cylinder (380), a second support plate (361) is provided on one side of the installation box (360), a rotating plate (810) is rotatably sleeved outside the rotating cylinder (380), a connecting column is provided on the rotating plate (810) and is arranged to penetrate the second support plate (361), a second spring (820) for driving the rotating plate (810) to move downward is sleeved on the connecting column, a guide block (390) is provided at the protruding end of the connecting column, a guide slide groove is provided on the guide block (390), a guide slide rod (830) is provided on the lower side surface of the operating cover plate (20), and the movement of the operating cover plate (20) is used to drive the guide slide rod (830) to slide into the guide slide groove, so as to realize the upward movement of the guide block (390).

5. A cloth feeding mechanism for a sewing machine according to claim 4, characterized in that: A mounting groove (901) is provided on the guide block (390) corresponding to the rotating cylinder (380); the control unit comprises a trigger switch (902) which is arranged in the mounting groove (901) and is electrically connected to the motor (330); the operating cover plate (20) is moved to drive the guide slide bar (830) to slide into the guide slide groove to trigger the trigger switch (902); the trigger switch (902) is used to control the motor (330) to work so that the swing bar (331) rotates to the highest point.

6. A cloth feeding mechanism for a sewing machine according to claim 4, characterized in that: The lower end of the rotating cylinder (380) extends outward to form a limiting portion for overlapping the rotating plate (810), and the rotating cylinder (380) is externally threadedly connected with a locking nut for limiting the rotating plate (810) on the limiting portion.

7. A sewing machine, comprising a machine body, a machine base (30) and a machine head (31) disposed on the machine base (30), wherein the machine base (30) and the machine head (31) are reversibly disposed on the upper side of the machine body, characterized in that: A cloth feeding mechanism is provided in the machine body and below the machine base (30), and the cloth feeding mechanism is a cloth feeding mechanism according to any one of claims 1 to 6.

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