Intelligent lockstitch sewing machine for knitted garment production

Abstract

The invention relates to the technical field of lockstitch sewing machines, and provides an intelligent lockstitch sewing machine for knitted garment production, which comprises a rack, a lockstitch sewing machine body, an auxiliary cloth feeding assembly, a rotating assembly, an auxiliary threading mechanism and a bobbin switching assembly. The rotating assembly is used for driving the auxiliary cloth feeding assembly to rotate around the needle plate mechanism so as to assist the cloth in automatic curve sewing; a pressure detection assembly is arranged on the bobbin switching assembly and used for monitoring the tension of a sewing thread and controlling the bobbin switching assembly to automatically replace bobbins when it is detected that the thread is broken or thread materials are about to be used up; the auxiliary threading mechanism can be matched with the intelligent mechanical arm to complete automatic threading operation. By means of the technical scheme, the technical problems that an existing lockstitch sewing machine is low in automation degree, operation is inconvenient during curve sewing, the thread changing and threading process is tedious and time-consuming, and production efficiency is seriously affected are solved.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of flat bed sewing machines, in particular, to an intelligent flat bed sewing machine for knitted garment production. BACKGROUND

[0002] Flat bed sewing machines are indispensable key equipment in the field of knitted garment production, and their performance and efficiency are directly related to the overall output and quality of garment manufacturing. However, existing conventional flat bed sewing machines mainly rely on manual operation by workers in terms of operation, and the level of automation and intelligence is generally not high.

[0003] In actual production, workers need to place the fabric to be sewn on the needle plate and skillfully guide the fabric with both hands to move it according to the predetermined sewing trajectory. For straight-line sewing, this operation is relatively simple, but when curved or arc edge sewing of garment patterns is required, the difficulty of operation increases significantly. The operator needs to coordinate both hands to constantly adjust the direction and speed of the fabric to match the sewing rhythm of the machine needle, which not only requires a high degree of skill from the operator, but also has low production efficiency and is difficult to ensure the consistency of product quality.

[0004] In addition, in the process of continuous sewing for a long time, the breakage of sewing thread or the depletion of thread cone is a common situation. Once such a situation occurs, the equipment must be stopped for manual thread changing and threading operation by the worker. Especially the needle threading step, which requires threading the fine thread through the tiny needle hole, is not only tedious and time-consuming, but also a test of the worker's eyesight. Frequent stoppages and manual interventions seriously affect the continuity and overall efficiency of the production line. At the same time, the existing equipment generally lacks real-time monitoring capability for the use state of the sewing thread, and cannot predict that the thread will soon run out or immediately alarm and stop after the thread breaks, which can easily lead to the production of defective products due to empty sewing. SUMMARY

[0005] To overcome the above-mentioned defects, the present application provides an intelligent flat bed sewing machine for knitted garment production, which solves the technical problems of low automation level of existing flat bed sewing machines, inconvenient operation when sewing curves, and tedious and time-consuming thread changing and threading process which seriously affects production efficiency.

[0006] According to one aspect, at least one embodiment of the present application provides an intelligent flat bed sewing machine for knitted garment production, comprising a machine frame, a flat bed sewing machine body mounted on the top wall of the machine frame, and two intelligent mechanical arms, the top wall of the machine frame is fixed with a needle plate mechanism matched with the flat bed sewing machine body, further comprising: An auxiliary fabric feeding assembly is rotatably mounted on the top of the machine frame, and the auxiliary fabric feeding assembly is used to move the sewn fabric; A rotating assembly is mounted on the bottom wall of the machine frame, and the rotating assembly is used to control the deflection of the auxiliary fabric feeding assembly at a certain angle; An auxiliary threading mechanism is fixed on the side wall of the flat sewing machine body, and is used for cooperating with the intelligent mechanical arm to perform a threading operation. A bobbin switching assembly is fixed on the top wall of the rack by a connecting frame, and a pressure detection assembly is arranged on the bobbin switching assembly.

[0007] For example, in the intelligent flat sewing machine for producing knitted garments provided by at least one embodiment of the present application, a fan-shaped deflection groove is formed in the rear side of the top wall of the rack, and the auxiliary fabric feeding assembly is rotatably arranged in the deflection groove.

[0008] For example, in the intelligent flat sewing machine for producing knitted garments provided by at least one embodiment of the present application, the auxiliary fabric feeding assembly comprises a hollow rotating plate, a rotating sleeve is fixed to the bottom of one end of the rotating plate, the bottom of the rotating sleeve penetrates the bottom wall of the rack through a bearing, the rotating sleeve is rotatably arranged on the outer side of the needle plate mechanism, a lead screw is rotatably installed in the rotating plate, a first motor for driving the rotation of the lead screw is fixed to the outer wall of the rotating plate, a matched lead screw nut is screwed on the lead screw, and a pressing mechanism is arranged above the rotating plate.

[0009] For example, in the intelligent flat sewing machine for producing knitted garments provided by at least one embodiment of the present application, two parallel sliding grooves are symmetrically formed in the top wall of the rotating plate, and a limiting through groove is formed between the sliding grooves and the inner cavity of the rotating plate.

[0010] For example, in the intelligent flat sewing machine for producing knitted garments provided by at least one embodiment of the present application, the pressing mechanism comprises two symmetrically arranged sliding blocks, the sliding blocks are slidingly installed in the corresponding sliding grooves, the two sliding blocks are fixedly connected to the side wall of the lead screw nut through a connecting plate, the connecting plate is slidingly installed in the corresponding limiting through groove, a vertical plate is fixed between the top walls of the two sliding blocks, an installation plate is fixed to one side of the top wall of the vertical plate, an electric push rod is fixed to the top wall of the installation plate, and a pressing plate is slidingly penetrated through the installation plate and fixed to the bottom of the electric push rod.

[0011] For example, in the intelligent flat sewing machine for producing knitted garments provided by at least one embodiment of the present application, the rotating assembly comprises an outer shell fixed to the bottom wall of the rack, a second motor is fixed to the bottom wall of the inner cavity of the outer shell, a driving gear is fixed to the power shaft at the top of the second motor, an external gear ring is connected in meshing connection with the driving gear, the external gear ring is fixed to the outer wall of the rotating sleeve, and the bottom end of the needle plate mechanism is fixedly connected to the bottom wall of the inner cavity of the outer shell.

[0012] For example, the application provides an intelligent flat sewing machine for knitted garment production, wherein the auxiliary threading mechanism comprises a support fixed on the side wall of the flat sewing machine body, and an air suction pipe is fixed at the bottom end of the support and connected to an external air pump through an electromagnetic valve.

[0013] For example, the application provides an intelligent flat sewing machine for knitted garment production, wherein the thread drum switching assembly comprises a base fixed on the top wall of the rack through a connecting frame, a hexagonal seat is rotatably installed on the top wall of the base, a thread drum insertion rod is fixed at the top wall of each corner of the hexagonal seat, a No. 1 guide ring is fixed at each corner of the hexagonal seat, and a driving mechanism for driving the rotation of the hexagonal seat is arranged on the bottom wall of the base.

[0014] For example, the application provides an intelligent flat sewing machine for knitted garment production, wherein the driving mechanism comprises a mounting shell fixed on the bottom wall of the base, a partition plate is fixed between the inner walls of the mounting shell, a No. 3 motor is fixed on the bottom wall of the inner cavity of the mounting shell, a power shaft at the top of the No. 3 motor penetrates the partition plate through a bearing and is fixed with a driving dial, a groove wheel matched with the driving dial is rotatably installed on the top wall of the partition plate, and the mounting shaft of the groove wheel penetrates the top wall of the base through a bearing and is fixedly connected to the axial position of the bottom wall of the hexagonal seat.

[0015] For example, the application provides an intelligent flat sewing machine for knitted garment production, wherein the pressure detection assembly comprises a sleeve fixed at the front end of the base through a connecting rod, a stand is fixed at the center of the bottom wall of the inner cavity of the sleeve, a pressure sensor is fixed at the top end of the stand, a movable column is slidably sleeved at the top end of the sleeve, a limiting plate is fixed at the bottom end of the movable column, the limiting plate is slidably installed in the sleeve, a spring is fixed between the limiting plate and the bottom wall of the inner cavity of the sleeve, and a No. 2 guide ring is fixed at the top end of the movable column.

[0016] The embodiments of the application have the following advantages: (1) In the application, the auxiliary cloth feeding assembly and the rotating assembly are arranged, so that the auxiliary cloth feeding assembly can drive the cloth to accurately deflect around the needle plate mechanism during the sewing process, especially during the curve sewing. The automatic auxiliary control of curve sewing is realized, and the dependence on manual guidance is completely eliminated, thereby significantly reducing the dependence on the operation proficiency of workers, improving the sewing precision of complex lines and the consistency of product quality, and greatly improving the production efficiency.

[0017] (2) In the application, by setting the thread drum switching assembly and the pressure detection assembly, the tension state of the sewing thread can be monitored in real time. When the pressure detection assembly detects thread breakage (tension loss) or the thread is about to run out (abnormal tension), a signal can be immediately sent, and the thread drum switching assembly can be automatically switched to a new full thread drum. This realizes the automation of the thread changing process, avoids long downtime caused by manual thread changing, ensures the continuity of production, and effectively prevents defective products caused by empty sewing.

[0018] (3) In the application, by setting the auxiliary threading mechanism, after the automatic thread changing is completed, the intelligent mechanical arm can be used to quickly complete the threading action with the aid of suction force. The most tedious, time-consuming and eye power demanding needle threading step in traditional sewing is completely automated, greatly shortening the downtime, reducing the labor intensity of workers, and making the entire production process more smooth and efficient. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed to be used in the description of the embodiments of the application will be briefly introduced. Obviously, the drawings in the following description are only some example embodiments of the application. For those skilled in the art, other drawings can be obtained according to the content of the example embodiments of the application and the drawings without creative labor.

[0020] Figure 1 is a perspective view of the external structure of the application; Figure 2 is a perspective view of the auxiliary threading mechanism in the application Figure 1 is an enlarged schematic view of position A in the application; Figure 3 is a perspective view of the top structure of the rack in the application; Figure 4 is a half-cut perspective view of the rotating assembly in the application; Figure 5 is a perspective view of the auxiliary fabric feeding assembly structure in the application; Figure 6 is a perspective view of the structure of the pressing mechanism and the rotating plate in the application in a separated state; Figure 7 is a perspective view of the thread drum switching assembly structure in the application; Figure 8 is a perspective view of the driving mechanism structure in the application; Figure 9 is a perspective view of the pressure detection assembly structure in the application; In the figure: 1, rack; 2, lockstitch machine body; 3, intelligent mechanical arm; 4, needle plate mechanism; 5, deflection groove; 6, auxiliary cloth feeding assembly; 61, rotating plate; 62, lead screw; 63, No. 1 motor; 64, lead screw nut; 65, pressing mechanism; 651, sliding block; 652, connecting plate; 653, vertical plate; 654, mounting plate; 655, electric push rod; 656, pressing plate; 66, rotating sleeve; 7, rotating assembly; 71, shell; 72, No. 2 motor; 73, drive gear; 74, external gear ring; 8, auxiliary threading mechanism; 81, bracket; 82, suction pipe; 9, connecting frame; 10, bobbin switching assembly; 101, base; 102, hexagonal seat; 103, bobbin insertion rod; 104, No. 1 guide ring; 105, drive mechanism; 1051, mounting shell; 1052, partition plate; 1053, No. 3 motor; 1054, driving dial; 1055, groove wheel; 11, pressure detection assembly; 111, sleeve; 112, connecting rod; 113, stand column; 114, pressure sensor; 115, movable column; 116, limiting plate; 117, spring; 118, No. 2 guide ring; 12, sliding groove; 13, limiting through groove. DETAILED DESCRIPTION

[0021] The application will be further described below in conjunction with the drawings and examples. It can be understood that the specific examples described herein are only used to explain the application, and not to limit the application.

[0022] In order to make the drawing simple, only the parts related to the application are shown in each drawing, which does not represent the actual structure of the product. In addition, in order to make the drawing simple and easy to understand, in some drawings, only one of the parts with the same structure or function is shown, or only one of them is marked. In this text, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0023] In this text, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0024] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "under", "below" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0025] In the description of the present embodiment, the terms "upper", "lower", "left", "right" and the like orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0026] In addition, in the description of the present application, the terms "first", "second" and the like are only used for differentiation in description and cannot be understood as indicating or implying relative importance.

[0027] As shown in Figure 1 , it shows an intelligent flat sewing machine for knitting garment production in an embodiment of the present application, mainly comprising a machine frame 1, a flat sewing machine body 2 mounted on the top wall of the machine frame 1, two intelligent mechanical arms 3 for grabbing and assisting in placing cloth and thread, a needle plate mechanism 4 cooperating with the needle of the flat sewing machine body 2, and further comprising: An auxiliary cloth feeding assembly 6 is used to assist in feeding cloth during sewing, especially when sewing curves, and can cooperate with the needle to rotate synchronously.

[0028] A rotating assembly 7 is used to drive the auxiliary cloth feeding assembly 6 to deflect at a precise angle.

[0029] An auxiliary threading mechanism 8 is used to quickly complete the threading operation after thread breakage or thread change in cooperation with the intelligent mechanical arm 3.

[0030] A bobbin switching assembly 10 is used to store multiple standby bobbins and automatically switch when needed. The assembly is fixed on the top wall of the machine frame 1 through a connecting frame 9.

[0031] A pressure detection assembly 11 is installed on the bobbin switching assembly 10 and is used to monitor the tension of the sewing thread in real time to determine whether thread breakage or thread running out is about to occur.

[0032] As shown in Figures 3-6 , it shows the auxiliary cloth feeding assembly 6 and the rotating assembly 7 in an embodiment of the present application.

[0033] In order to provide a rotation space for the auxiliary fabric feeding assembly 6, a fan-shaped deflection groove 5 is formed in the rear side of the top wall of the machine frame 1, and the main body of the auxiliary fabric feeding assembly 6 is rotationally arranged in the deflection groove 5.

[0034] The auxiliary fabric feeding assembly 6 comprises a hollow rotating plate 61. One end of the rotating plate 61 is fixedly connected with a rotating sleeve 66 which rotationally penetrates the top wall of the machine frame 1 through a bearing and is sleeved outside the needle plate mechanism 4. This design enables the entire auxiliary fabric feeding assembly 6 to rotate around the center of the needle plate mechanism 4 (i.e. the needle falling point).

[0035] In the inner cavity of the rotating plate 61, a lead screw 62 is rotationally arranged. A No. 1 motor 63 is fixed on the outer wall of the rotating plate 61, and the output shaft of the motor is connected with the lead screw 62 for driving the lead screw 62 to rotate forward and backward. A lead screw nut 64 which is matched with the lead screw 62 is threadedly connected on the lead screw 62.

[0036] A pressing mechanism 65 is arranged above the rotating plate 61 for applying slight pressure to the fabric to assist fabric feeding. As shown in Figure 5 and Figure 6 The top wall of the rotating plate 61 is symmetrically provided with two parallel sliding grooves 12, and corresponding limiting through grooves 13 are formed between the sliding grooves 12 and the inner cavity of the rotating plate 61.

[0037] The pressing mechanism 65 comprises two symmetrically arranged sliding blocks 651 which are respectively slidingly arranged in the corresponding sliding grooves 12. Each sliding block 651 is fixedly connected with the side wall of the lead screw nut 64 through a connecting plate 652, and the connecting plate 652 is slidingly arranged in the corresponding limiting through groove 13. In this way, when the No. 1 motor 63 drives the lead screw 62 to rotate, the lead screw nut 64 will move axially along the lead screw 62, and then drive the two sliding blocks 651 to synchronously move in the sliding grooves 12 through the connecting plate 652.

[0038] A vertical plate 653 is fixed between the top walls of the two sliding blocks 651. An installation plate 654 is fixed on one side of the top wall of the vertical plate 653, and an electric push rod 655 is fixedly arranged on the installation plate 654. The movable end of the electric push rod 655 penetrates the installation plate 654 downward and is fixedly connected with a pressing plate 656.

[0039] In operation, the intelligent mechanical arm 3 places the fabric on the needle plate mechanism 4. The electric push rod 655 is extended to drive the pressing plate 656 to descend and press the fabric with appropriate pressure. During straight sewing, the No. 1 motor 63 can be started to drive the pressing mechanism 65 to move forward and backward as a whole, thereby assisting the feed dog of the lockstitch machine body 2 to convey the fabric.

[0040] Please refer to Figure 4The rotating assembly 7 is installed on the bottom wall of the frame 1. It comprises a housing 71, in which a second motor 72 is fixed. A driving gear 73 is fixed on the power shaft of the second motor 72. The driving gear 73 is engaged with an external gear ring 74. The external gear ring 74 is fixed on the outer wall of the rotating sleeve 66. The bottom end of the needle plate mechanism 4 is fixedly connected to the bottom wall of the inner cavity of the housing 71, so as to ensure the stability of the position.

[0041] When it is necessary to sew a curve, the control system starts the second motor 72 to drive the driving gear 73 to rotate, so as to drive the external gear ring 74 to rotate. Since the external gear ring 74 is fixedly connected with the rotating sleeve 66, the entire auxiliary cloth feeding assembly 6 will deflect around the needle plate mechanism 4 to guide the cloth to be sewn according to the preset curve track, so that high-precision curve sewing automation is realized.

[0042] As shown in Figures 1-2 , it shows the auxiliary threading mechanism 8 in an embodiment of the application.

[0043] The auxiliary threading mechanism 8 comprises a support 81 fixed on the side of the lockstitch machine body 2 close to the needle. The bottom end of the support 81 is fixed with a suction pipe 82, and the pipe opening of the suction pipe 82 is opposite to the rear of the threading hole of the needle. The suction pipe 82 is connected with an external air pump (not shown in the figure) through an electromagnetic valve.

[0044] When it is necessary to automatically thread, the intelligent mechanical arm 3 will clamp the sewing thread head and accurately send it to the front of the threading hole of the needle. At this time, the control system opens the electromagnetic valve, the air pump is started, and the suction pipe 82 generates strong suction force to instantly suck the thread head through the needle hole, so that the threading action is quickly completed.

[0045] As shown in Figures 7-9 , it shows the thread cylinder switching assembly 10 and the pressure detection assembly 11 in an embodiment of the application.

[0046] The thread cylinder switching assembly 10 is used to realize automatic replacement of the thread cylinder. It comprises a base 101 fixed on the frame 1 through the connecting frame 9. A hexagonal seat 102 is rotatably installed on the top wall of the base 101. A thread cylinder insertion rod 103 is perpendicularly fixed on each of the six top corners of the hexagonal seat 102, for inserting a sewing thread cylinder. A first guide ring 104 is also fixed at each corner, for guiding the sewing thread on the corresponding thread cylinder.

[0047] The bottom wall of the base 101 is provided with a driving mechanism 105 for driving the hexagonal seat 102 to intermittently rotate. As Figure 7As shown, the driving mechanism 105 adopts a Geneva mechanism. It includes a mounting shell 1051 fixed on the bottom wall of the base 101, and a partition plate 1052 is arranged in the shell. The bottom of the mounting shell 1051 is fixed with a No. 3 motor 1053, the power shaft of which penetrates the partition plate 1052 upward and is fixed with a driving disc 1054. A Geneva wheel 1055 cooperating with the driving disc 1054 is rotatably arranged on the top wall of the partition plate 1052. The mounting shaft of the Geneva wheel 1055 penetrates the bottom wall of the hexagonal seat 102 upward and is fixedly connected with the center of the hexagonal seat 102.

[0048] When it is necessary to switch the bobbin, the No. 3 motor 1053 is started to drive the driving disc 1054 to rotate. The driving pin on the driving disc 1054 is clamped into the groove of the Geneva wheel 1055 to drive the Geneva wheel 1055 to rotate through a fixed angle (60 degrees in this case), so that the hexagonal seat 102 also accurately rotates 60 degrees to switch the next full-load bobbin to the working position.

[0049] Please refer to Figure 9 The pressure detection assembly 11 is used for monitoring the tension of the sewing thread. It includes a sleeve 111 fixed on the front end of the base 101 through a connecting rod 112 and located on the thread path between the current working bobbin and the lockstitch machine body 2. A stand 113 is fixed on the bottom wall of the inner cavity of the sleeve 111, and a pressure sensor 114 is fixed on the top end of the stand 113. An active column 115 is slidably sleeved on the top end of the sleeve 111, and a No. 2 guide ring 118 for guiding the sewing thread is fixed on the top end of the active column 115. A limiting plate 116 is fixed on the bottom end of the active column 115, and the limiting plate 116 can slide up and down in the sleeve 111. A spring 117 is arranged between the limiting plate 116 and the bottom wall of the inner cavity of the sleeve 111 to provide upward supporting force.

[0050] In work, the sewing thread drawn from the current working bobbin passes through the No. 1 guide ring 104, then passes through the No. 2 guide ring 118, and then is sent to the lockstitch machine body 2. The tension of the sewing thread itself pulls the active column 115 downward, so that the limiting plate 116 at the bottom of the active column 115 presses the pressure sensor 114 downward. The pressure sensor 114 transmits the pressure signal in real time to the control system.

[0051] Working principle: the overall working process of the present application includes: Preparation stage: install multiple full-load bobbins on the bobbin inserting rod 103 of the hexagonal seat 102. The intelligent mechanical arm 3 cooperates with the auxiliary threading mechanism 8 to complete the initial threading.

[0052] Sewing stage: the smart mechanical arm 3 places the cloth, and the electric push rod 655 drives the pressing plate 656 to press the cloth. The lockstitch machine starts to work. When sewing straight lines, the auxiliary cloth feeding assembly 6 can assist in feeding the cloth; when sewing curves, the rotating assembly 7 drives the auxiliary cloth feeding assembly 6 to deflect, guiding the cloth to complete the sewing of complex trajectories.

[0053] Monitoring and switching: during the sewing process, the pressure detection assembly 11 continuously monitors the sewing thread tension. When the thread breaks (the tension disappears instantaneously) or the thread spool is about to run out (the tension abnormally increases), the pressure sensor 114 sends a signal.

[0054] Automatic thread changing: after the control system receives the signal, the lockstitch machine stops immediately. The No. 3 motor 1053 is started to drive the hexagonal seat 102 to rotate 60 degrees, switching a brand new thread spool to the working position (when the thread spool is about to run out, the hexagonal seat 102 will automatically break the sewing thread during the rotating process).

[0055] Automatic threading: after the thread changing is completed, the smart mechanical arm 3 automatically grabs the new thread end and cooperates with the auxiliary threading mechanism 8 to quickly complete the threading.

[0056] Resuming work: after the threading is completed, the device automatically resumes the sewing work.

[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. An intelligent flat bed sewing machine for producing knitted garments, comprising a machine frame (1) and a flat bed sewing machine body (2) and two intelligent mechanical arms (3) installed on the top wall of the machine frame (1), a needle plate mechanism (4) matched with the flat bed sewing machine body (2) is fixed on the top wall of the machine frame (1), characterized in that, Also include: The auxiliary cloth feeding assembly (6) is rotatably installed on the top of the frame (1), and the auxiliary cloth feeding assembly (6) is used to drive the stitched cloth to move; The rotating assembly (7) is installed on the bottom wall of the frame (1), and the rotating assembly (7) is used to control the auxiliary cloth feeding assembly (6) to deflect at a certain angle; The auxiliary threading mechanism (8) is fixed on the side wall of the lockstitch machine body (2), and the auxiliary threading mechanism (8) is used to cooperate with the intelligent mechanical arm (3) to thread; The thread cylinder switching assembly (10) is fixed on the top wall of the frame (1) through the connecting frame (9), and the thread cylinder switching assembly (10) is provided with a pressure detection assembly (11).

2. The intelligent flat bed sewing machine for knitwear production as claimed in claim 1 wherein, The top wall of the frame (1) is provided with a fan-shaped deflection groove (5) on the rear side, and the auxiliary cloth feeding assembly (6) is rotatably installed in the deflection groove (5).

3. The intelligent flat bed sewing machine for knitwear production as claimed in claim 2 wherein, The auxiliary cloth feeding assembly (6) includes a hollow rotating plate (61), one end of the rotating plate (61) is fixed with a rotating sleeve (66), the bottom of the rotating sleeve (66) penetrates the bottom wall of the frame (1) through a bearing, the rotating sleeve (66) is rotatably installed on the outside of the needle plate mechanism (4), a lead screw (62) is rotatably installed in the rotating plate (61), a first motor (63) is fixed on the outer wall of the rotating plate (61) and drives the lead screw (62) to rotate, a matched lead screw nut (64) is screwed on the lead screw (62), and a pressing mechanism (65) is installed above the rotating plate (61).

4. The intelligent flat bed sewing machine for producing knitted garments as claimed in claim 3 wherein, The top wall of the rotating plate (61) is symmetrically provided with two parallel sliding grooves (12), and a limiting groove (13) is penetratingly formed between the sliding grooves (12) and the inner cavity of the rotating plate (61).

5. The intelligent flat bed sewing machine for knitwear production as claimed in claim 4 wherein, The pressing mechanism (65) includes two symmetrically arranged sliding blocks (651), the sliding blocks (651) are slidingly installed in the corresponding sliding grooves (12), the two sliding blocks (651) are fixedly connected with the side wall of the lead screw nut (64) through a connecting plate (652), the connecting plate (652) is slidingly installed in the corresponding limiting groove (13), a vertical plate (653) is fixed between the top walls of the two sliding blocks (651), an installation plate (654) is fixed on one side of the top wall of the vertical plate (653), an electric push rod (655) is fixed on the top wall of the installation plate (654), and the movable end of the electric push rod (655) is slidingly penetrating through the installation plate (654) and fixed with a pressing plate (656).

6. The intelligent flat bed sewing machine for producing knitted garments as claimed in claim 3 wherein, The rotating assembly (7) includes a shell (71) fixed on the bottom wall of the frame (1), a second motor (72) is fixed on the bottom wall of the inner cavity of the shell (71), a driving gear (73) is fixed on the power shaft of the top of the second motor (72), an external gear ring (74) is connected in meshing connection with the driving gear (73), the external gear ring (74) is fixed on the outer wall of the rotating sleeve (66), and the bottom end of the needle plate mechanism (4) is fixedly connected with the bottom wall of the inner cavity of the shell (71).

7. The intelligent flat bed sewing machine for production of knitted garments as claimed in claim 1 wherein, The auxiliary threading mechanism (8) includes a support (81) fixed on the side wall of the lockstitch machine body (2), and an air suction pipe (82) is fixed at the bottom end of the support (81), and the air suction pipe (82) is connected with an external air pump through an electromagnetic valve.

8. The intelligent flat bed sewing machine for production of knitted garments as claimed in claim 1 wherein, The bobbin switching assembly (10) includes a base (101), the side wall of the base (101) is fixed on the top wall of the rack (1) through a connecting frame (9), a hexagonal seat (102) is rotatably installed on the top wall of the base (101), a bobbin inserting rod (103) is fixed on the top wall of the hexagonal seat (102) at the corresponding corner position, a No. 1 guide ring (104) is fixed on the corner position of the hexagonal seat (102), and a driving mechanism (105) for driving the hexagonal seat (102) to rotate is arranged on the bottom wall of the base (101).

9. The intelligent flat bed sewing machine for production of knitted garments as claimed in claim 8 wherein, The driving mechanism (105) includes a mounting shell (1051) fixed on the bottom wall of the base (101), a partition plate (1052) is fixed between the inner walls of the mounting shell (1051), a No. 3 motor (1053) is fixed on the bottom wall of the inner cavity of the mounting shell (1051), a power shaft on the top of the No. 3 motor (1053) penetrates through the partition plate (1052) through a bearing and is fixed with a driving dial (1054), a groove wheel (1055) rotatably installed on the top wall of the partition plate (1052) is matched with the driving dial (1054), and the mounting shaft of the groove wheel (1055) penetrates through the top wall of the base (101) through a bearing and is fixedly connected with the bottom wall shaft center position of the hexagonal seat (102).

10. The intelligent flat bed sewing machine for production of knitted garments as claimed in claim 8 wherein, The pressure detection assembly (11) includes a sleeve (111) fixed on the front end of the base (101) through a connecting rod (112), a stand column (113) is fixed on the bottom wall center of the inner cavity of the sleeve (111), a pressure sensor (114) is fixed on the top end of the stand column (113), a movable column (115) is slidably sleeved on the top end of the sleeve (111), a limiting plate (116) is fixed on the bottom end of the movable column (115), the limiting plate (116) is slidably installed in the sleeve (111), a spring (117) is fixed between the limiting plate (116) and the bottom wall of the inner cavity of the sleeve (111), and a No. 2 guide ring (118) is fixed on the top end of the movable column (115).

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