Knitted T-shirt sewing equipment and sewing process thereof

Abstract

The invention relates to the field of knitting T-shirt sewing processing, in particular to knitting T-shirt sewing equipment and a knitting T-shirt sewing process, the knitting T-shirt sewing equipment comprises a base, a rotating shuttle is rotatably connected in the base, and a protective shell is mounted above the base. By adjusting the positioning bolt, the rotating matching position of the connecting frame and the rocker arm is changed, so that the rotating radius of the connecting frame is changed, the time interval of reciprocating motion of the push rod is changed, and the effect of adjusting the gap of the sewing thread is achieved; the push rods can be matched with different push shafts, sewing threads of different specifications are rapidly switched, gears are driven to rotate in the reciprocating motion process of the push shafts, a first annular plate and a second annular plate are made to rotate in cooperation with gear rings, and therefore cloth is synchronously conveyed; by means of the structure, the sewing machine can rapidly complete switching of sewing threads of different specifications, gaps of the sewing threads can be rapidly controlled, and therefore different machining process requirements are met.

Description

Technical Field

[0001] The present invention relates to the field of sewing processing of knitted T-shirts, and specifically relates to a sewing device and a sewing process for knitted T-shirts. Background Art

[0002] The sewing processing of knitted T-shirts is a process involving various types of sewing thread trace processes. The selection and application of these processes directly affect the quality and appearance of the final product. Sewing processing refers to the process of stitching two or more pieces of fabric together through thread traces using a sewing machine or manual tools. It is not only used for making clothing but also widely applied in multiple fields such as home decoration, automotive interiors, luggage, shoes, and hats.

[0003] For the Chinese invention patent application with the publication number CN110699865A, a sewing device, the present invention includes a machine frame, a machine head located on the machine frame, a walking device and a rotating device arranged on the machine frame: the rotating device is rotatably arranged on the machine head and is used to adjust the direction of the material relative to the machine head. The rotating device includes a first driving device, a transmission group and a rotating member for placing the material. The transmission group is driven by the first driving device to rotate the rotating member. The first driving device is connected to the machine frame. Since the first driving device is directly connected to the machine frame, the weight of the rotating member is reduced, alleviating the problem of uneven sewing seams caused by the excessive weight of the rotating member.

[0004] During the sewing process of knitted T-shirts with existing sewing devices, due to different strength requirements and aesthetic requirements for different parts of knitted T-shirts, generally different specifications or different colors of sewing threads are used for sewing. However, the existing processing devices can only perform sewing processing with one type of sewing thread at a time, and the operation of replacing the sewing thread is rather cumbersome. Therefore, multiple sets of devices need to be added to meet the processing of knitted T-shirts, which increases the production and processing costs and reduces the processing efficiency.

[0005] Therefore, it is necessary to invent a sewing device and a sewing process for knitted T-shirts to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a sewing device and a sewing process for knitted T-shirts. By adjusting the rotational cooperation position of the connecting frame and the rocker arm, the gap of the sewing thread is adjusted, and through the rotation of the rotating cylinder, the positions of different sewing thread pushing shafts can be switched, thereby completing the rapid switching of different specifications of sewing threads, so as to solve the problem that the types of sewing threads processed by a single device in the prior art are single, affecting the use cost and processing efficiency of the device.

[0007] To achieve the above object, the present invention provides the following technical solutions: a sewing device for a knitted T-shirt, including a base, a rotary shuttle is rotatably connected inside the base, a protective shell is installed above the base, a crankshaft is rotatably connected inside the protective shell, an electric motor is installed on one side of the protective shell, and the output end of the electric motor is axially connected to the crankshaft. A belt drive structure is installed between the crankshaft and the rotary shuttle; The power assembly disposed inside the protective shell includes rocker arms, the rocker arms are symmetrically installed above the crankshaft, a second sliding cavity is formed on the surface of the rocker arms, a connecting frame is arranged between the two groups of rocker arms, a first sliding cavity is symmetrically formed inside the connecting frame, a positioning bolt is movably connected in the first sliding cavity in a positioning manner, and one side of the positioning bolt is fixedly connected to the inside of the second sliding cavity; The positioning assembly disposed above the base includes a fixed cylinder, the fixed cylinder is installed above the base, an annular groove is formed on the inner wall of the fixed cylinder, four groups of sliding grooves are annularly distributed on the inner wall of the annular groove, a rotating rod penetrates through the fixed cylinder, positioning blocks are annularly distributed on the rotating rod, the positioning blocks are slidably connected to the corresponding sliding grooves, a rotating cylinder is fixedly sleeved on the rotating rod, a sleeve is installed below the rotating cylinder, and the sleeve is sleeved with the fixed cylinder; The sewing assembly disposed inside the rotating cylinder includes four groups of fixing frames, the four groups of fixing frames are installed inside the rotating cylinder, half rings are installed on both sides of the fixing frames, and the adjacent half rings of each group form a ring. A push shaft penetrates through the ring formed by each group of half rings, and a sewing needle is installed below the push shaft; The transmission assembly disposed inside the rotating cylinder includes a rectangular frame, the rectangular frames are annularly distributed and installed outside the sleeve, and four groups of rectangular frames are also annularly distributed and installed on the inner wall of the rotating cylinder. Moreover, the opening directions of the rectangular frames outside the sleeve are opposite to the opening directions of the rectangular frames on the inner wall of the rotating cylinder. A fixing plate penetrates through each group of rectangular frames, an adjusting bolt is screwed above the fixing plate, and the adjusting bolt is rotatably connected to the upper part of the corresponding rectangular frame. One side of the fixing plate is rotatably connected to a gear; The feeding assembly disposed inside the rotating cylinder includes a first annular plate, a positioning ring is installed on the inner wall of the first annular plate, an annular sliding rail is fixedly sleeved on the sleeve, and the positioning ring is slidably connected to the annular sliding rail. A second annular plate is connected to the inner wall of the rotating cylinder in the same manner as the first annular plate, and an annular space is provided between the second annular plate and the first annular plate. Moreover, each group of sewing needles is at the same horizontal position as this annular space.

[0008] As a preferred solution of the present invention, the power assembly further includes a push rod, the push rod is rotatably connected below the connecting frame, and the push rod penetrates through the lower part of the protective shell.

[0009] As a preferred embodiment of the present invention, the positioning component further includes an annular cavity, which is opened on the inner wall of the fixed cylinder. A first fixed ring is sleeved and fixed on the rotating rod, and the first fixed ring is slidably connected to the annular cavity.

[0010] As a preferred embodiment of the present invention, a first spring is sleeved on the rotating rod, and both sides of the first spring are respectively in contact with the inner wall of the annular cavity and the first fixed ring. Four sets of bobbin rods are annularly distributed and installed at the upper edge of the rotating cylinder.

[0011] As a preferred embodiment of the present invention, the sewing component further includes a guide groove, which is opened on the inner wall of each semi-ring. Guide blocks are symmetrically installed on the push shaft, and the guide blocks are slidably connected to the corresponding guide grooves.

[0012] As a preferred embodiment of the present invention, a second fixed ring is sleeved and fixed on the push shaft, and the upper part of one of the push shafts is in contact with the push rod. A second spring is sleeved on the push shaft, and both sides of the second spring are respectively in contact with the second fixed ring and the corresponding two semi-rings.

[0013] As a preferred embodiment of the present invention, the transmission component further includes a turntable, which is rotatably connected to the side of the fixed plate away from the gear, and the turntable is shaft-connected to the gear. A positioning hole is opened at an eccentric position of the turntable, a positioning shaft penetrates through the positioning hole, one side of the positioning shaft is rotatably connected to a connecting arm, and one side of the connecting arm is rotatably connected to the push shaft.

[0014] As a preferred embodiment of the present invention, the feeding component further includes a toothed ring, which is installed above the first annular plate and the second annular plate, and the two toothed rings are meshed with the corresponding gears. The number of teeth of the gear closer to the sleeve side is greater than the number of teeth of the gear closer to the rotating cylinder side. Multiple sets of fixed teeth are annularly distributed and installed below the first annular plate and the second annular plate.

[0015] The sewing process of a knitted T-shirt includes the sewing equipment for knitted T-shirts as described above, and the processing steps are specifically as follows: S1: Drive the crankshaft and the rotating shuttle to rotate through the electric motor, so that the push rod moves up and down reciprocally, so that the push rod pushes the push shaft to move, and the sewing needle moves up and down through the knitted T-shirt and cooperates with the rotating shuttle to complete sewing; S2: During the sewing process, when the push shaft reciprocates, drive the turntable to rotate through the connecting arm, so that the gear rotates, and the gear drives the first annular plate and the second annular plate to rotate through the toothed ring, so as to convey the knitted T-shirt; S3: By pulling the rotating rod, when the positioning block moves along the chute to a position flush with the annular groove, at this time, after rotating the sleeve, the positions of each sewing needle can be changed, so as to realize replacing different specifications of sewing threads according to different processing techniques; S4: By turning the positioning bolts, the positions of the connecting frame and the rocker arm are changed, causing the pushing distance of the push rod to vary, thereby achieving the effect of adjusting the sewing thread density.

[0016] In the above technical solution, compared with the prior art, the technical effects and advantages provided by the present invention are as follows: By adjusting the positioning bolts, the rotational cooperation position between the connecting frame and the rocker arm is changed, thereby changing the rotation radius of the connecting frame, thus altering the time interval of the reciprocating motion of the push rod, thereby achieving the effect of adjusting the thread gap. Moreover, by rotating the position of the rotating cylinder, the push rod can form a cooperation with different push shafts, thereby completing the rapid switching of sewing threads of different specifications. During the reciprocating motion of the push shaft, the gear is driven to rotate, and in cooperation with the toothed ring, the first annular plate and the second annular plate are rotated, thereby synchronously conveying the fabric. Through this structure, the device can quickly complete the switching of sewing threads of different specifications and can quickly control the thread gap, thus meeting the requirements of different processing techniques. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0018] Figure 1 Schematic diagram of the overall structure of the present invention; Figure 2 Schematic diagram of the overall planing structure of the present invention; Figure 3 Schematic diagram of the overall structure of the rotating cylinder of the present invention; Figure 4 Schematic diagram of the planing structure of the rotating cylinder of the present invention; Figure 5 Schematic diagram of the bottom structure of the rotating cylinder of the present invention; Figure 6 Schematic diagram of the internal layout structure of the rotating cylinder of the present invention; Figure 7 Schematic diagram of the planing structure of the turntable of the present invention; Figure 8 Schematic diagram of the shape structure of the positioning hole and the positioning shaft of the present invention; Figure 9 Schematic diagram of the planing structure of the fixed cylinder of the present invention; Figure 10 of the present invention Figure 4 Enlarged structure schematic diagram at position A.

[0019] Description of the reference numerals: 001. Base; 101. Rotating shuttle; 102. Protective shell; 103. Crankshaft; 104. Electric motor; 105. Belt drive structure; 002. Power assembly; 201. Push rod; 202. Connecting frame; 203. First sliding cavity; 204. Rocker arm; 205. Second sliding cavity; 206. Positioning bolt; 003. Positioning assembly; 301. Fixed cylinder; 302. Annular groove; 303. Chute; 304. Annular cavity; 305. Rotating rod; 306. First fixing ring; 307. First spring; 308. Positioning block; 309. Rotating cylinder; 310. Bobbin rod; 311. Sleeve; 004. Sewing assembly; 401. Fixed frame; 402. Half ring; 403. Guide groove; 404. Pushing shaft; 405. Guide block; 406. Sewing needle; 407. Second fixing ring; 408. Second spring; 005. Transmission assembly; 501. Rectangular frame; 502. Fixed plate; 503. Adjusting bolt; 504. Gear; 505. Turntable; 506. Positioning hole; 507. Positioning shaft; 508. Connecting arm; 006. Feeding assembly; 601. First annular plate; 602. Positioning ring; 603. Annular slide rail; 604. Tooth ring; 605. Fixed tooth; 606. Second annular plate. Detailed implementation manner

[0020] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0021] The present invention provides a sewing device for knitted T-shirts as Figures 1-10 shown, including a base 001. A rotating shuttle 101 is rotatably connected inside the base 001. A protective shell 102 is installed above the base 001. A crankshaft 103 is rotatably connected inside the protective shell 102. An electric motor 104 is installed on one side of the protective shell 102, and the output end of the electric motor 104 is shaft-connected to the crankshaft 103. A belt drive structure 105 is installed between the crankshaft 103 and the rotating shuttle 101; The electric motor 104 can drive the crankshaft 103 to rotate, and the rotating shuttle 101 can be synchronously rotated through the belt drive structure 105.

[0022] The power assembly 002 arranged inside the protective shell 102 includes a rocker arm 204. The rocker arms 204 are symmetrically installed above the crankshaft 103. A second sliding cavity 205 is formed on the surface of the rocker arm 204. A connecting frame 202 is arranged between the two groups of rocker arms 204. First sliding cavities 203 are symmetrically formed inside the connecting frame 202. A positioning bolt 206 is movably connected in the first sliding cavity 203 in a positioning manner, and one side of the positioning bolt 206 is fixedly connected to the inside of the second sliding cavity 205; Through the cooperation of the positioning bolt 206 and the first sliding cavity 203, the connecting frame 202 can move freely. And through the cooperation of the second sliding cavity 205 and the positioning bolt 206, the mating position between the rocker arm 204 and the connecting frame 202 can be changed, so that when the crankshaft 103 rotates, the rotation amplitude of the connecting frame 202 is changed.

[0023] The positioning component 003 arranged above the base 001 includes a fixed cylinder 301. The fixed cylinder 301 is installed above the base 001. An annular groove 302 is formed on the inner wall of the fixed cylinder 301. Four groups of sliding grooves 303 are annularly distributed on the inner wall of the annular groove 302. A rotating rod 305 is connected through the fixed cylinder 301. Positioning blocks 308 are annularly distributed on the rotating rod 305. The positioning blocks 308 are slidably connected with the corresponding sliding grooves 303. A rotating cylinder 309 is sleeved and fixed on the rotating rod 305. A sleeve 311 is installed below the rotating cylinder 309, and the sleeve 311 is sleeved with the fixed cylinder 301; Through the cooperation of the positioning blocks 308 and the sliding grooves 303, the position of the rotating rod 305 in the fixed cylinder 301 is limited. And when the rotating rod 305 moves upward from the fixed cylinder 301, the positioning blocks 308 can be driven to move along the sliding grooves 303 to a position flush with the annular groove 302. At this time, the rotating rod 305 can rotate freely, thereby changing the position of the rotating cylinder 309.

[0024] The sewing component 004 arranged in the rotating cylinder 309 includes four groups of fixing frames 401. The four groups of fixing frames 401 are installed in the rotating cylinder 309. Half rings 402 are installed on both sides of the fixing frame 401, and adjacent half rings 402 of each group form a ring. A push shaft 404 is connected through the ring formed by each group of half rings 402. A sewing needle 406 is installed below the push shaft 404; Through the fixing frame 401, the fixing of the half rings 402 can be completed. And through the cooperation of each group of half rings 402, the push shaft 404 can move up and down stably in a reciprocating manner.

[0025] The transmission component 005 arranged in the rotating cylinder 309 includes a rectangular frame 501. The rectangular frames 501 are annularly distributed and installed on the outer side of the sleeve 311, and four groups of rectangular frames 501 are also annularly distributed and installed on the inner wall of the rotating cylinder 309. And the opening directions of the rectangular frames 501 outside the sleeve 311 are arranged in an opposite direction to the opening directions of the rectangular frames 501 on the inner wall of the rotating cylinder 309. A fixing plate 502 is connected through each group of rectangular frames 501. An adjusting bolt 503 is screwed above the fixing plate 502, and the adjusting bolt 503 is rotatably connected with the upper part of the corresponding rectangular frame 501. A gear 504 is rotatably connected to one side of the fixing plate 502; By adjusting the bolt 503, the fixing plate 502 can be driven to slide along the rectangular frame 501, so that the fixing plate 502 drives the gear 504 on one side to move.

[0026] The feeding component 006 arranged inside the rotating drum 309 includes a first annular plate 601. A positioning ring 602 is installed on the inner wall of the first annular plate 601. An annular sliding rail 603 is sleeved and fixed on the sleeve 311, and the positioning ring 602 is slidably connected to the annular sliding rail 603. The second annular plate 606 is connected to the inner wall of the rotating drum 309 in the same manner as the first annular plate 601, and an annular space is provided between the second annular plate 606 and the first annular plate 601. And each group of sewing needles 406 is at the same horizontal position as the annular space here.

[0027] Through the cooperation of the positioning ring 602 and the annular sliding rail 603, the first annular plate 601 rotates on the sleeve 311, and the second annular plate 606 can be rotated inside the rotating drum 309 by the same method.

[0028] Further, in the above structure, the power component 002 further includes a push rod 201. The push rod 201 is rotatably connected below the connecting frame 202, and the push rod 201 is connected through the lower part of the protective shell 102.

[0029] Through the rotation of the connecting frame 202, the push rod 201 can perform reciprocating up and down movements.

[0030] Further, in the above structure, the positioning component 003 further includes an annular cavity 304. The annular cavity 304 is opened on the inner wall of the fixed cylinder 301. A first fixed ring 306 is sleeved and fixed on the rotating rod 305, and the first fixed ring 306 is slidably connected to the annular cavity 304.

[0031] Through the cooperation of the first fixed ring 306 and the annular cavity 304, the rotating rod 305 can move stably inside the fixed cylinder 301.

[0032] Further, in the above structure, a first spring 307 is sleeved on the rotating rod 305, and both sides of the first spring 307 are respectively in contact with the inner wall of the annular cavity 304 and the first fixed ring 306. Four groups of bobbin rods 310 are annularly distributed and installed at the upper edge of the rotating drum 309.

[0033] Through the cooperation of the first spring 307 and the first fixed ring 306, the position of the rotating rod 305 can be maintained, so that the positioning block 308 and the sliding groove 303 are stably matched, and the bobbin rods 310 can fix bobbins of different specifications.

[0034] Further, in the above structure, the sewing component 004 further includes a guide groove 403. The guide groove 403 is opened on the inner wall of each half ring 402. Guide blocks 405 are symmetrically installed on the push shaft 404, and the guide blocks 405 are slidably connected to the corresponding guide grooves 403.

[0035] Through the cooperation of the guiding block 405 and the guiding groove 403, the pushing shaft 404 can stably slide up and down between the half rings 402.

[0036] Furthermore, in the above structure, a second fixing ring 407 is sleeved and fixed on the pushing shaft 404. One side above a group of pushing shafts 404 is in contact with the push rod 201. A second spring 408 is sleeved on the pushing shaft 404, and both sides of the second spring 408 are respectively in contact with the second fixing ring 407 and the corresponding two groups of half rings 402.

[0037] Through the cooperation of the second spring 408 and the second fixing ring 407, after the pushing shaft 404 is extruded by the push rod 201 and moves downward, it can be reset in time.

[0038] Furthermore, in the above structure, the transmission component 005 further includes a turntable 505. The turntable 505 is rotatably connected to the side of the fixing plate 502 away from the gear 504, and the turntable 505 is axially connected to the gear 504. A positioning hole 506 is provided at an eccentric position of the turntable 505. A positioning shaft 507 is penetrated and connected in the positioning hole 506. One side of the positioning shaft 507 is rotatably connected to a connecting arm 508, and one side of the connecting arm 508 is rotatably connected to the pushing shaft 404.

[0039] Through the connecting arm 508, the pushing shaft 404 can drive the turntable 505 to rotate when moving up and down reciprocally, so that the gear 504 rotates. And through the cooperation of the positioning hole 506 and the positioning shaft 507, when the fixing plate 502 drives the gear 504 to move, it does not affect the connection structure of the connecting arm 508, and the gears 504 on both sides of the pushing shaft 404 that do not cooperate with the push rod 201 need to move, so as to disengage from the toothed ring 604, avoiding the influence of the toothed ring 604 on the idle pushing shaft 404 through the connecting arm 508 during the working process.

[0040] Furthermore, in the above structure, the feeding component 006 further includes a toothed ring 604. The toothed ring 604 is installed above the first annular plate 601 and the second annular plate 606. Two groups of toothed rings 604 are meshed with the corresponding gears 504. And the number of teeth of the gear 504 close to the sleeve 311 is greater than the number of teeth of the gear 504 close to the rotating cylinder 309. A plurality of fixed teeth 605 are annularly distributed and installed below the first annular plate 601 and the second annular plate 606.

[0041] Through the tooth number difference between the two groups of gears 504, when the two groups of gears 504 drive the first annular plate 601 and the second annular plate 606, the conveying speeds of the two can be made consistent, and the fixed teeth 605 can ensure the fixation of the fabric.

[0042] The sewing process of a knitted T-shirt, including the sewing equipment for the knitted T-shirt as above, the processing steps are specifically as follows: S1: Drive the crankshaft 103 and the rotary hook 101 to rotate through the electric motor 104, so that the push rod 201 moves up and down reciprocally, thereby causing the push rod 201 to push the push shaft 404 to move, making the sewing needle 406 move up and down through the knitted T-shirt, and cooperating with the rotary hook 101 to complete sewing; S2: During the sewing process, when the push shaft 404 reciprocates, it drives the turntable 505 to rotate through the connecting arm 508, thereby causing the gear 504 to rotate, and the gear 504 drives the annular plate one 601 and the annular plate two 606 to rotate through the toothed ring 604, thereby conveying the knitted T-shirt; S3: By pulling the rotating rod 305, the positioning block 308 moves along the sliding groove 303 to a position flush with the annular groove 302. At this time, after rotating the rotating sleeve 311, the positions of each group of sewing needles 406 can be changed, so as to realize changing the sewing threads of different specifications according to different processing techniques; S4: By screwing the positioning bolt 206, the positions of the connecting frame 202 and the rocker arm 204 are changed, and the pushing distance of the push rod 201 is changed, so as to achieve the effect of adjusting the sewing thread density.

[0043] As Figures 1-10 shown, by pulling the rotating rod 305 to drive the rotating cylinder 309 to move, thereby causing the annular plate one 601 and the annular plate two 606 to move upward. At this time, place the knitted T-shirt fabric above the base 001. Then loosen the rotating rod 305, and the rotating cylinder 309 drives the annular plate one 601 and the annular plate two 606 to move downward, so that the fixed teeth 605 fix the knitted T-shirt fabric. At this time, drive the crankshaft 103 to rotate through the electric motor 104, and drive the rotary hook 101 to rotate through the belt drive structure 105, so that the crankshaft 103 drives the rocker arm 204 to rotate, and drive the connecting frame 202 to rotate through the positioning bolt 206, making the lower push rod 201 move up and down reciprocally, and the push rod 201 pushes the lower push shaft 404 to reciprocate, thereby performing sewing.

[0044] During the up and down movement of the push shaft 404, it can drive the gear 504 to drive the toothed ring 604, so that the annular plate one 601 and the annular plate two 606 rotate, thereby synchronously conveying the fabric, and the rotational cooperation position of the connecting frame 202 and the rocker arm 204 can be adjusted through the positioning bolt 206, thereby changing the rotation radius of the connecting frame 202, making the pushing gap of the push rod 201 change, so as to achieve the effect of adjusting the sewing gap.

[0045] When it is necessary to replace the sewing threads of different specifications, it is necessary to rotate the adjusting bolt 503 to make the fixed plate 502 slide within the rectangular frame 501, so that the gear 504 disengages from the toothed ring 604. And by pulling the rotating rod 305, the positioning block 308 slides along the chute 303 to a position flush with the annular groove 302. At this time, the rotating rod 305 can rotate freely, thereby changing the angle of the rotating cylinder 309, so that different push shafts 404 move below the push rod 201. Finally, release the rotating rod 305 and rotate the adjusting bolt 503 to make the new gear 504 cooperate with the toothed ring 604, thus completing the switching of the sewing thread. Through this structure, the equipment can quickly complete the switching of sewing threads of different specifications and can quickly control the gap of the sewing thread, so as to meet the requirements of different processing technologies.

[0046] Only some exemplary embodiments of the present invention have been described by way of illustration. Undoubtedly, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A sewing device for knitted T-shirts, comprising a base (001), characterized in that: A rotary shuttle (101) is rotatably connected inside the base (001), a protective shell (102) is installed above the base (001), a crankshaft (103) is rotatably connected inside the protective shell (102), an electric motor (104) is installed on one side of the protective shell (102), and an output end of the electric motor (104) is axially connected to the crankshaft (103), and a belt transmission structure (105) is installed between the crankshaft (103) and the rotary shuttle (101); The power assembly (002) disposed in the protective shell (102) comprises a rocker arm (204), the rocker arm (204) being symmetrically mounted above the crankshaft (103), a second sliding cavity (205) being provided on the surface of the rocker arm (204), a connecting frame (202) being provided between two groups of the rocker arms (204), a first sliding cavity (203) being symmetrically provided in the connecting frame (202), a positioning bolt (206) being movably connected in positioning in the first sliding cavity (203), and one side of the positioning bolt (206) being fixedly connected to the inside of the second sliding cavity (205); The positioning assembly (003) disposed above the base (001) comprises a fixed cylinder (301), the fixed cylinder (301) being mounted above the base (001), an annular groove (302) being provided on the inner wall of the fixed cylinder (301), four groups of slide grooves (303) being provided on the inner wall of the annular groove (302) in an annular distribution, a rotating rod (305) being connected through the fixed cylinder (301), positioning blocks (308) being provided in an annular distribution on the rotating rod (305), the positioning blocks (308) being slidably connected to the corresponding slide grooves (303), a rotating cylinder (309) being sleeved and fixed on the rotating rod (305), a sleeve (311) being provided below the rotating cylinder (309), and the sleeve (311) being sleeved on the fixed cylinder (301); The sewing assembly (004) disposed in the rotating drum (309) comprises four groups of fixing frames (401), the four groups of fixing frames (401) being installed in the rotating drum (309), half rings (402) being installed on both sides of the fixing frames (401), and each group of adjacent half rings (402) forming a ring shape, a push shaft (404) penetrating and connected in the ring shape formed by each group of the half rings (402), and a sewing needle (406) being installed below the push shaft (404); The transmission assembly (005) disposed in the rotating drum (309) comprises rectangular frames (501), the rectangular frames (501) being installed in an annular arrangement outside the sleeve (311), and four groups of rectangular frames (501) being installed in an annular arrangement on the inner wall of the rotating drum (309), and the opening direction of each group of rectangular frames (501) outside the sleeve (311) is arranged opposite to the opening direction of the rectangular frames (501) on the inner wall of the rotating drum (309), a fixing plate (502) is connected through each group of the rectangular frames (501), an adjusting bolt (503) is screwed on the top of the fixing plate (502), and the adjusting bolt (503) is rotatably connected to the top of the corresponding rectangular frame (501), and a gear (504) is rotatably connected to one side of the fixing plate (502); The feeding assembly (006) arranged in the rotating drum (309) includes an annular plate 1 (601), a positioning ring (602) is installed on the inner wall of the annular plate 1 (601), an annular slide rail (603) is sleeved and fixed on the sleeve (311), and the positioning ring (602) is slidably connected to the annular slide rail (603), an annular plate 2 (606) is connected to the inner wall of the rotating drum (309) in the same manner as the annular plate 1 (601), and an annular space is provided between the annular plate 2 (606) and the annular plate 1 (601), and each group of sewing needles (406) is at the same horizontal position as the annular space here.

2. The sewing device for knitted T-shirts according to claim 1, characterized in that: The power assembly (002) further comprises a push rod (201), wherein the push rod (201) is rotatably connected to the bottom of the connecting frame (202), and the push rod (201) is connected through the bottom of the protective shell (102).

3. The sewing device for knitted T-shirts according to claim 1, characterized in that: The positioning assembly (003) further comprises an annular cavity (304), wherein the annular cavity (304) is formed on the inner wall of the fixed cylinder (301), a fixing ring 1 (306) is sleeved and fixed on the rotating rod (305), and the fixing ring 1 (306) is slidably connected to the annular cavity (304).

4. The sewing device for knitted T-shirts according to claim 3, characterized in that: A spring 1 (307) is sleeved on the rotating rod (305), and two sides of the spring 1 (307) are respectively in contact with the inner wall of the annular cavity (304) and the fixing ring 1 (306). Four groups of coil rods (310) are installed in a circular arrangement at the upper edge of the rotating cylinder (309).

5. The sewing device for knitted T-shirts according to claim 1, characterized in that: The sewing assembly (004) further comprises a guide groove (403), wherein the guide groove (403) is formed on the inner wall of each group of half rings (402), and guide blocks (405) are symmetrically mounted on the push shaft (404), and the guide blocks (405) are slidably connected to the corresponding guide groove (403).

6. The sewing device for knitted T-shirts according to claim 5, characterized in that: A second fixing ring (407) is sleeved and fixed on the push shaft (404), and the top of one group of push shafts (404) is fitted with the push rod (201). A second spring (408) is sleeved on the push shaft (404), and both sides of the second spring (408) are respectively fitted with the second fixing ring (407) and the corresponding two groups of half rings (402).

7. The sewing device for knitted T-shirts according to claim 1, characterized in that: The transmission assembly (005) further comprises a rotating disk (505), wherein the rotating disk (505) is rotatably connected to a side of the fixed plate (502) away from the gear (504), and the rotating disk (505) is axially connected to the gear (504), and a positioning hole (506) is provided at an eccentric position of the rotating disk (505), and a positioning shaft (507) is connected through the positioning hole (506), and a connecting arm (508) is rotatably connected to one side of the positioning shaft (507), and one side of the connecting arm (508) is rotatably connected to the push shaft (404).

8. The sewing device for knitted T-shirts according to claim 1, characterized in that: The feeding assembly (006) further comprises a gear ring (604), wherein the gear ring (604) is mounted above the annular plate 1 (601) and the annular plate 2 (606), and the two sets of gear rings (604) are meshed with corresponding gears (504), and the number of teeth of the gear (504) on the side close to the sleeve (311) is greater than the number of teeth of the gear (504) on the side close to the rotating drum (309), and a plurality of sets of fixed teeth (605) are mounted in an annular distribution below the annular plate 1 (601) and the annular plate 2 (606).

9. A process for sewing a knitted T-shirt, comprising the sewing device for sewing a knitted T-shirt according to any one of claims 1 to 8, characterized in that: The processing steps are as follows: S1: The crankshaft (103) and the rotary shuttle (101) are rotated by the electric motor (104), so that the push rod (201) reciprocates up and down, so that the push rod (201) pushes the push shaft (404) to move, so that the sewing needle (406) moves up and down to pass through the knitted T-shirt, and cooperates with the rotary shuttle (101) to complete sewing; S2: During the sewing process, the push shaft (404) reciprocates to drive the turntable (505) to rotate through the connecting arm (508), thereby rotating the gear (504), and the gear (504) drives the annular plate 1 (601) and the annular plate 2 (606) to rotate through the gear ring (604), thereby conveying the knitted T-shirt; S3: by pulling the rotating rod (305), the positioning block (308) moves along the slide groove (303) to a position flush with the annular groove (302), and then the sleeve (311) is rotated to change the position of each group of sewing needles (406), so as to realize the replacement of sutures of different specifications according to different processing techniques; S4: By screwing the positioning bolt (206), the positions of the connecting frame (202) and the rocker arm (204) are changed, so that the pushing distance of the push rod (201) is changed, thereby achieving the effect of adjusting the sewing line density.

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