4498 results about "Sewing machine" patented technology

The invention relates to the technical field of clothing manufacturing, in particular to an AI scheduling optimization method for clothing flexible production and an ERP integrated system. Comprising the following steps: multi-source heterogeneous data acquisition and fusion: acquiring real-time equipment state data of a clothing production line through Internet of Things equipment, wherein the real-time equipment state data comprises a sewing machine rotating speed, a cutting bed load rate and a quality inspection station abnormal signal; obtaining an order delivery period, a material inventory and a BOM process path through an ERP system; the equipment data and the order data are stored in a distributed database after being aligned through timestamps; dynamic priority modeling: constructing a dynamic priority calculation model based on the order emergency degree, the production line bottleneck process load threshold and the material neat rate, and generating an order-insertable process-level priority queue; according to the scheme, the limitation of a traditional method can be broken through, and the modern production requirements of flexibility and high aging are met.

The invention discloses a sewing machine needle dynamic track self-adaptive deviation correction control system, and relates to the technical field of needle control. The fusion acquisition module is used for acquiring data by an industrial camera, a displacement sensor and the like and performing fusion denoising; the dynamic self-adaptive model construction module is used for constructing a track model by means of a deep learning framework in combination with sewing parameters; the multi-dimensional deviation analysis module is used for generating a priority matrix by integrating deviations such as positions and postures; the layered collaborative deviation rectification module plans a deviation rectification path through reinforcement learning and the like; according to the intelligent flexible execution module, flexible deviation correction is achieved through a voice coil motor and a piezoelectric ceramic driver, and all the modules cooperate to guarantee sewing precision. Needle data are accurately collected, a track model is adjusted in real time according to the process, deviation is intelligently analyzed, layered deviation correction is conducted, and compliant control is achieved; meanwhile, the functions of environment perception, fault diagnosis, man-machine interaction and the like are achieved, sewing precision, adaptability and efficiency are improved, and energy consumption is reduced.

The invention provides a thread trimming method of a sewing machine, and belongs to the technical field of sewing machines. The problem that an existing thread trimming method is insufficient in bird groove preventing effect is solved. The thread trimming method comprises the following steps that A, a machine needle is driven to drive an upper thread end to move downwards to penetrate through a lower needle hole in a movable cutter and then move upwards to the position above a needle plate, and the upper thread end is kept in the lower needle hole; b, a thread trimming power mechanism starts to work, a movable cutter is driven to drive an upper thread end to move in the direction away from a needle falling hole, and then the thread trimming power mechanism stops working; c, the needle bar power mechanism drives the machine needle to sew a plurality of stitches; d, the thread trimming power mechanism works again, the movable cutter and the auxiliary cutter are driven to move in the direction close to the needle falling hole together, the movable cutter stops moving until the movable cutter is located under the needle falling hole in the needle plate, and the auxiliary cutter continues to move to be meshed with the movable cutter edge to cut off the upper thread end. The thread trimming device has the advantages of being high in thread trimming efficiency and good in bird nest prevention effect.

The invention provides a sewing machine and a sewing method thereof, and belongs to the technical field of sewing equipment. The problem that an existing sewing machine is insufficient in sewing quality is solved. The sewing machine comprises a base, a needle plate with a needle falling hole, a bottom shuttle located below the needle plate, a straight-rod-shaped transmission rod and a strip-shaped thread shifting rod, the transmission rod is located on the side portion of the bottom shuttle and movably connected to the base, the end, close to the bottom shuttle, of the transmission rod is fixedly connected with one end of the thread shifting rod, and the other end of the transmission rod is connected with a thread shifting driving assembly. Under the driving of the thread shifting driving assembly, the transmission rod can perform reciprocating motion in the axial direction and swing at the same time, so that the other end of the thread shifting rod performs circumferential circulating motion and can be located between the needle falling hole and the bottom shuttle. Reverse stitches can be avoided in the sewing process, the sewing machine has the advantage of being low in manufacturing cost, and the sewing quality is further improved.

A system and method, for guiding a sewing operation for a sewing machine, are provided herein. One of one or more stitch objects having stitch data associated therewith may be selected. Each of the one or more stitch objects are defined by a geometric pattern. The stitch data of the one of the one or more stitch objects is analyzed to identify one or more lines forming the geometric pattern. At least a portion of a sewing material is sewn, onto the workpiece with the needle, in a direction defined by a first of the one or more lines forming the geometric pattern. A primary light source projects a first of one or more guidelines onto the workpiece. The first of the one or more guidelines corresponds to a second of the one or more lines forming the geometric pattern.

This invention provides a single-action anti-bird nest thread-cutting mechanism and its control method. The single-action anti-bird nest thread-cutting mechanism includes a fixed blade, a rotatable movable blade, a thread-cutting drive source, and a thread-cutting drive assembly. The fixed blade has a fixed blade edge. The thread-cutting drive source is connected to the movable blade via the thread-cutting drive assembly, driving the movable blade to rotate towards or away from the fixed blade. The movable blade has a starting thread hook groove and a separating thread hook groove. The starting thread hook groove allows the sewing machine needle to pass through. The movable blade has a moving blade edge on its surface facing the fixed blade. The starting thread hook groove and the separating thread hook groove are distributed on the same side of the moving blade edge. This application uses the same thread-cutting drive source and the same set of movable and fixed blades to achieve the purpose of preventing bird nests during the starting thread cutting and automatic thread cutting after sewing, effectively avoiding thread breakage during the starting thread and achieving a stable effect of normal starting thread without bird nest clumps.

The utility model relates to the technical field of sewing machines, in particular to a guide rail of an inner shuttle frame, the inner shuttle frame and a rotating shuttle, which comprises a non-closed annular guide rail body with a self-lubricating wear-resistant function, a thread hooking head is arranged at one end of the annular guide rail body, and a thread loosening head is arranged at the other end of the annular guide rail body. The inner side face of the annular guide rail body is concavely provided with a mounting cavity and a plurality of meshing holes concavely formed in the side wall of the mounting cavity, and the meshing holes are distributed along the mounting cavity. The annular guide rail body has the self-lubricating and wear-resisting functions, the guide rail is firmly connected to the outer side wall of the inner shuttle body, and the guide rail on the inner shuttle body is high in position precision and good in stability.

The invention discloses an improved patch pocket machine which comprises a rack, a workbench, an edge folding module, a feeding module, a feeding and discharging module and a sewing machine head, wherein the workbench, the edge folding module, the feeding module, the feeding and discharging module and the sewing machine head are installed on the rack. The edge folding module comprises an edge folding positioning seat, an up-down air cylinder, a material pressing assembly, a bag bottom edge folding assembly, two bag edge folding assemblies and two upper bag corner edge folding assemblies, wherein the material pressing assembly, the bag bottom edge folding assembly, the two bag edge folding assemblies and the two upper bag corner edge folding assemblies are installed on the edge folding positioning seat. The material pressing assembly comprises a bag pressing plate installed at the bottom of the edge folding positioning base. The bag bottom edge folding assembly comprises a bag bottom edge folding air cylinder capable of being adjusted left and right and a bag bottom edge folding piece connected to the bag bottom edge folding air cylinder in an up-down adjusting mode. Each bag edge folding assembly comprises a bag edge folding air cylinder capable of being adjusted front and back and a bag edge folding piece connected to the bag edge folding air cylinder in an up-down adjusting mode. Each upper bag corner folding assembly comprises an upper bag corner folding air cylinder capable of being adjusted front and back and an upper bag corner folding piece connected to the upper bag corner folding air cylinder in an up-down adjusting mode. The edge folding module can be used for folding edges of pocket cloth of different sizes and thicknesses.

Sewing workpiece holders for sewing machines and associated methods are disclosed herein. According to an aspect, a sewing workpiece holder includes a first frame that defines an opening. A second frame defines an opening. The second frame is configured to attach to the first frame and to hold a sewing workpiece therebetween. The openings of the first frame and the second frame substantially align when the second frame is attached to the first frame such that a portion of the sewing workpiece is exposed within the aligned openings when the sewing workpiece is held. A first bracket is attached to a first side of the first frame or the second frame. The first bracket is attachable to the sewing embroidery machine. A second bracket is attached to a second side of the first frame or the second frame. The second bracket is attachable to the sewing embroidery machine.

The utility model provides a thread trimming mechanism and a sewing machine with the same. The thread trimming mechanism comprises a first movable cutter which comprises a thread clamping part and a first cutting edge part; the second movable cutter is arranged on one side of the first movable cutter, and the second movable cutter comprises a thread collecting groove and a second cutting edge part, and the thread collecting groove is used for allowing the upper threads to penetrate through; the second cutting edge part is located on the side, away from the first movable cutter, of the line concentration groove and faces a groove opening of the line concentration groove. The first cutting edge part is located on the side, away from the second movable cutter, of the thread clamping part and faces the thread clamping part. Wherein the second movable cutter is movably arranged in the direction close to or away from the first movable cutter so as to move to a thread clamping position where a clamping gap used for clamping an upper thread is formed between the thread clamping part and the second cutting edge part or a thread cutting position where the first cutting edge part and the second cutting edge part are in contact to cut off the upper thread. According to the technical scheme provided by the utility model, the technical problem that bird nest stitches are easily formed when a sewing machine in the prior art starts sewing can be solved.

The invention provides a sewing machine right thread hook, a thread passing mechanism, a sewing machine and a right thread hook upper thread track, the sewing machine right thread hook comprises a fixing portion and a guiding portion, the guiding portion is slidably connected to the fixing portion, an upper thread is arranged in the guiding portion in a penetrating mode, and the guiding portion can slide on the fixing portion along with the upper thread to enable the upper thread to be in a low-tension position. The guide part is connected to the fixing part in a sliding mode, so that the thread containing range of the thread passing part comprises the movement range of the thread clamping face of the large thread clamping device and the movement range of the thread passing hole of the take-up lever, when sewing work is carried out, the guide part can slide on the fixing part along with an upper thread, the upper thread is made to be located at the low-tension position all the time, the change amplitude of tension is reduced, and sewing efficiency is improved. And the problems of line throwing and line breaking are avoided.

An exemplary sewing machine includes a sewing head, a needle bar holding a needle, a motor for moving the needle during a sewing operation, a user interface, a data gathering device, a data storage device, and a processor. The data gathering device gathers data related to at least one of the sewing machine, an environment surrounding the sewing machine, a sewing material, the sewing operation performed by the sewing machine, and one or more interactions of a user with the sewing machine. The data storage device stores gathered data and data related to a neural network. The processor processes the gathered data through the neural network to generate processed data. Based on the processed data, the processor controls at least one of the user interface, the data storage device, and the motor.

The utility model provides a thread trimming structure of a sewing machine, and belongs to the technical field of sewing machines. The problems that an existing thread trimming structure is insufficient in working reliability and short in service life are solved. The thread trimming structure of the sewing machine comprises a thread pressing piece, an auxiliary cutter arranged on a machine base and a movable cutter which is located below a needle plate and can vertically swing around a rotating shuttle shaft of the sewing machine, the auxiliary cutter is provided with a thread trimming end with an auxiliary cutter edge, a thread hooking groove is formed in the movable cutter, and a movable cutter edge is formed in the upper edge of the thread hooking groove. When the movable cutter swings upwards, the thread hooking groove can directly face the needle falling hole up and down, when the movable cutter swings downwards, the cutting edge of the movable cutter can be meshed with the cutting edge of the auxiliary cutting edge, the thread pressing piece is movably connected to the upper side face of the movable cutter, and the movable cutter is further provided with a reset spring acting on the thread pressing piece. And when the auxiliary knife edge is meshed with the movable knife edge, the thread trimming end of the auxiliary knife can abut against the lower side face of the thread pressing piece. The working reliability and the service life of the thread trimming structure can be improved.

To provide data for analyzing causes of defects of a sewing object.SOLUTION: A sewing management system comprises: an input data acquisition part to acquire input data indicating defects of a plurality of sewing objects sewn by a plurality of operators using a plurality of sewing machines from an input device; a processing part to calculate defect rate for each of a plurality of evaluation items relating to sewing based on the input data; and an output part to output the defect rate.SELECTED DRAWING: Figure 1

The present invention provides a driving device for thread cutting, presser foot lifting and needle pitch adjustment, belonging to the technical field of sewing machines. It solves the problems such as reduced working efficiency of the existing device when meeting the requirements of driving thread cutting, presser foot lifting and needle pitch adjustment by one motor. The driving device for thread cutting, presser foot lifting and needle pitch adjustment includes a motor. A separately arranged thread cutting cam, a presser foot lifting cam and a needle pitch adjusting cam are fixedly connected to the rotating shaft of the motor. Both the thread cutting cam and the presser foot lifting cam are diamond-shaped, and the needle pitch adjusting cam is a curved quadrilateral. The needle pitch adjusting mechanism abuts against the outer peripheral wall of the needle pitch adjusting cam. When the effective needle pitch adjusting section of the needle pitch adjusting cam acts on the needle pitch adjusting mechanism, the thread cutting idle stroke surface of the thread cutting cam acts on the thread cutting mechanism, and the lifting idle stroke surface of the presser foot lifting cam acts on the presser foot lifting mechanism. This device meets the requirements of driving thread cutting, presser foot lifting and needle pitch adjustment by one motor and improves the working efficiency of the sewing machine at the same time.

The invention provides a cloth stem-crossing detection sewing device and method. The cloth stem-crossing detection sewing device comprises a first presser foot rod provided with an outer presser foot, a second presser foot rod provided with an inner presser foot, a presser foot transmission mechanism, a control module, a sewing material thickness detection sensor, an alternating quantity adjusting mechanism, an alternating quantity detection sensor and an alternating quantity adjusting driving source. The sewing material thickness detection sensor is obliquely mounted at the bottom of the sewing machine shell; detection points, falling on the sewing material, of the sewing material thickness detection sensor are distributed on the rear sides of the outer presser foot and the inner presser foot in the feeding direction of forward feeding during forward sewing of the sewing machine; the presser foot transmission mechanism is provided with a transmission swing seat for determining the alternating quantity of presser feet, and the alternating quantity adjusting driving source is connected with the transmission swing seat through the alternating quantity adjusting mechanism. The sewing material thickness is effectively detected in advance, so that the presser foot alternation amount is adjusted in time, the presser foot alternation amount of the sewing machine adapts to the change of the sewing material thickness, efficiency is improved, stem-crossing stitches are beautified, and sewing quality is guaranteed.

To provide data for analyzing the cause of a defect of a sewn object.SOLUTION: A sewing management system comprises: a defect cause storage unit to store a plurality of defect items, which are items on defect causes for sewn objects sewn by operators using sewing machines; an input data acquisition unit to acquire input data indicating defect causes from an input device; a processing unit to classify the input data by defect item; and an output unit to output the classified input data.SELECTED DRAWING: Figure 1

The utility model discloses a sewing machine with a turning piece. The sewing machine comprises a machine base, a sewing machine head, a rotating shuttle assembly and an extension arm. A transmission shaft is arranged in the extension arm; the end, away from the machine base, of the extension arm is provided with a turning piece in an extending mode, the turning piece comprises a first connecting part and a second connecting part, the rotating shuttle assembly is arranged on the second connecting part, the transmission shaft is in transmission connection with the rotating shuttle assembly through the linkage assembly, and a machining station is defined by the sewing machine head and the rotating shuttle assembly. An avoiding position is defined by the machine base, the extension arm and the first connecting part; thus, the first connecting part extends in the vertical direction, a processing position suitable for sewing is provided, meanwhile, an avoiding position which is large enough is provided, a shell of the luggage can penetrate through the avoiding position easily, the avoiding position can provide an avoiding space which is large enough for the luggage in the sewing process, in the actual sewing process, the shell and a bottom shell of the luggage do not need to be alternated up and down, and the sewing efficiency is improved. Therefore, the sewing effect is improved.

An embroidery frame arrangement assignable to a sewing or embroidery machine and on which an at least sectionally tubular or bag-like textile structure is clampable in order to provide a flat, single-layer first partial region of the textile structure to be embroidered. The embroidery frame arrangement has first and second frame parts which are fixable together and / or second and third frame parts which are fixable together. The tubular or bag-like section of the textile structure is fixable between the first and second frame parts or between the second and third frame parts when the second frame part engages with the first frame part and / or when the third frame part engages with the second frame part. Consequently, the flat, single-layer first partial region of the textile structure to be embroidered is provided on the second frame part and surrounded thereby or is provided on the third frame part and surrounded thereby.

The invention provides a presser foot slow descending control method and system, electronic equipment and a sewing machine. The method comprises the steps of obtaining target data; the target data comprises a target position, a current position and a preset slow descending position of the presser foot; the preset slow descending position is a preset pause position of the presser foot; comparing the target position with the preset slow descent position to obtain a comparison result; if the comparison result shows that slow descending is needed, descending the presser foot from the current position to the target position according to a preset slow descending strategy; and if the comparison result shows that slow descending is not needed, descending the presser foot from the current position to the target position according to a closed-loop control algorithm. The descending speed of the presser foot can be effectively reduced aiming at the electromagnet lifting presser foot, and noise is reduced. Meanwhile, the application range is wide, and the device is suitable for different electromagnet presser foot lifting machine types, such as flat sewing and overlock sewing.

The drilling device comprises a machine tool and a drilling unit, the drilling unit is arranged in the machine tool to conduct drilling machining on a machine head body of the sewing machine, and the drilling unit comprises a first air cylinder, a fixing box, a drill bit, a bearing and a dismounting and mounting assembly; a first air cylinder is fixedly installed on the upper side wall body of the machine tool, an output shaft at the lower end of the first air cylinder is fixedly connected with a fixing box, a bearing is arranged on the front side of the fixing box, and one end of the drill bit penetrates through the bearing to be installed in the fixing box. The dismounting and mounting assembly comprises a fixing mechanism for mounting the sewing machine head body and a replacing mechanism for replacing the sewing machine head body; by means of the automatic drill bit replacing device, time is greatly saved, production efficiency is improved, production stagnation caused by manual drill bit replacing after shutdown is greatly reduced, and a powerful guarantee is provided for large-scale sewing machine head production.

According to the noise vibration test equipment and the rotating shuttle calibration method, a rotating shuttle to be tested is installed on a rotating shuttle shaft driven by a driving device to rotate, an outer shuttle frame is fixed through a rotating shuttle positioning device, and the assembly and operation states of the rotating shuttle in a sewing machine are truly simulated; the noise and vibration parameters during high-speed operation are collected in real time by means of the noise and vibration detector, the noise and vibration performance of the rotating shuttle can be quantitatively evaluated before the whole machine is assembled, and interference of other parts of the whole machine is avoided. According to the method, the unqualified rotating shuttle can be recognized and debugged in advance, the situation that the noise and vibration of the whole machine exceed the standard due to the individual gap difference of the rotating shuttle is effectively prevented, front screening and grading management of the rotating shuttle quality are achieved, and the one-time assembly yield of the whole machine is remarkably improved; meanwhile, complex debugging after the whole machine is assembled is omitted, the rework, replacement and labor cost is greatly reduced, and the production efficiency and the product consistency are improved.

The embodiment of the invention relates to the field of smart home, and discloses a smart socket and a sewing machine fault early warning method. The method comprises the following steps: if an intelligent socket registration request is received, performing Bluetooth connection with an intelligent socket; acquiring first equipment information of the intelligent socket, and registering the intelligent socket to an Internet of Things platform according to the first equipment information and the Wi-Fi distribution network information; if the sewing machine registration request is received, second equipment information of the sewing machine connected to the intelligent socket is determined, and the sewing machine is registered to the Internet of Things platform; and monitoring whether the intelligent socket and the sewing machine have fault monitoring data in real time, if so, generating alarm information according to the fault monitoring data, and sending the alarm information to an intelligent terminal of a user. According to the scheme, through the functions of automatic equipment registration, real-time fault monitoring, intelligent alarm, remote management and the like, the intelligent management level of the equipment can be improved, the user experience is improved, the fault rate is reduced, the maintenance cost is saved, and the safety and reliability of the equipment are enhanced.

To enable various sewing steps to be carried out by a common sewing machine.SOLUTION: A sewing system comprises: a sewing machine unit including a sewing machine body and a sewing machine table on which the sewing machine body is installed; an auxiliary unit including an auxiliary mechanism to carry out a previous step of a fabric sewing work by the sewing machine body and an auxiliary table on which the auxiliary mechanism is installed; and a connection mechanism to connect the sewing machine unit and the auxiliary unit so as to be releasable. The connection mechanism has a positioning structure to adjust position between the sewing machine table and the auxiliary table.SELECTED DRAWING: Figure 1

The invention discloses a system and a method for monitoring the real-time working state of an intelligent sewing machine, and relates to the technical field of sewing machine running state monitoring. By comparing an actual ratio with a task preset ratio, a generated synchronous error set can accurately reflect the stability state of a feeding action in a sewing task; and further extracted deviation level parameters, fluctuation amplitude parameters and fluctuation trend characteristics are counted through a sliding window, so that the numerical trend of synchronous deviation between a feeding system and a needle bar system can be dynamically quantified, and subsequent trend modeling of fluctuation behaviors can be supported. The stitch density change score obtained through calculation can evaluate the stitch density stability of the current sewing task section in real time, abnormal section recognition and dynamic marking are carried out in combination with density tolerance threshold parameters, and a finally formed abnormal marking result set enables the system to have traceable, quantifiable and linkable density abnormal state sensing capacity.

To properly determine the delivery price of a sewing machine.SOLUTION: A sewing machine management system includes: a data acquisition unit for acquiring operation history data of a sewing machine; a processing unit for calculating the delivery price of the sewing machine on the basis of the operation history data; and an output unit for outputting the delivery price to an output device.SELECTED DRAWING: Figure 1

The utility model discloses a feeding mechanism for looping and sewing braids, which comprises a transverse conveying mechanism mounted on a machine table, a vertical conveying mechanism capable of stretching up and down is mounted on the transverse conveying mechanism, and a longitudinal conveying mechanism capable of sliding back and forth is mounted on the vertical conveying mechanism. A first rotating mechanism and a second rotating mechanism which can rotate by 90 degrees are fixedly installed on the longitudinal conveying mechanism, clamps controlled by a driving mechanism are installed on the first rotating mechanism and the second rotating mechanism, and after the two ends of a braid are clamped through the clamps, the first rotating mechanism and the second rotating mechanism rotate by 90 degrees. The two ends of the braid are in a horizontal state and abut against each other, and the braid is conveyed to the sewing machine to be sewn, can be suitable for more different kinds of braids, and is wide in application range.

The utility model provides an inner shuttle structure of a sewing machine, and belongs to the technical field of sewing machine accessories. The problem that in the prior art, thread throwing is prone to being generated in the sewing process is solved. The inner shuttle structure of the sewing machine comprises a cylindrical inner shuttle body, the outer edge of the inner shuttle body is provided with a needle falling groove and an anti-injury protruding edge arranged in the radial direction of the inner shuttle body in a protruding mode, the inner edge of the inner shuttle body is provided with a protruding block, and the protruding block and the anti-injury protruding edge are located on the same side of the inner shuttle body. A blocking face and a guiding face which intersect with the inner edge face of the inner shuttle body are arranged on the sides, close to and away from the needle falling groove, of the protruding block respectively, the guiding face and the blocking face are in smooth transition connection, and the included angle between the guiding face and the inner edge face of the inner shuttle body is an obtuse angle. The included angle between the blocking face and the inner edge face of the inner shuttle body is smaller than the included angle between the guide face and the inner edge face of the inner shuttle body. The sewing machine has the advantages that the probability of thread throwing and thread breaking in the sewing process can be effectively reduced, and the sewing quality is improved.

The invention relates to the technical field of sewing machines, in particular to a sewing machine presser foot lifting control method, which is characterized in that a main shaft motor, a feed lifting motor, a driving motor, a main shaft driven by the main shaft motor to rotate, a feed dog frame positioned below a needle plate and a feed dog mounted on the feed dog frame are arranged in the sewing machine; the main shaft drives the tooth frame and the feeding teeth to move back and forth in a reciprocating manner through a feeding mechanism connected between the main shaft and one end of the tooth frame; the feed lifting motor drives the feed rack and the feeding teeth to reciprocate up and down through a feed lifting mechanism connected between the feed lifting motor and the other end of the feed rack; the driving motor drives the presser foot to lift through a presser foot lifting mechanism connected between the driving motor and the presser foot; and before the driving motor drives the presser foot lifting mechanism to execute the presser foot lifting action, the feed dog lifting mechanism is driven by the feed dog lifting motor to enable the feed dog to be below the needle plate. The cloth cannot be dragged even if the feeding teeth move back and forth when the presser foot is lifted, so that the cloth can be conveniently taken and placed, the cloth is protected from being scratched, and the influence on the use of customers is avoided.

The invention provides a PI controller parameter optimization method and device, a control system, a terminal and a medium, and the PI controller parameter optimization method comprises the steps: setting a plurality of height sampling points in a presser foot stroke range of a sewing machine; for each height sampling point, determining an initial parameter of any one of a proportional gain KP and an integral gain KI of the PI controller and an initial parameter interval of the other parameter through a preliminary test; and optimizing the other parameter in the initial parameter interval by adopting an iterative approximation method to obtain an optimized parameter of the PI controller. Through precise PI controller parameter optimization design, the control precision of a user on different presser foot heights can be met. In addition, characteristics of different sewing materials and diversified working condition requirements can be effectively met, and powerful support is provided for efficient and high-quality development of sewing work.