2506 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.

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 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 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.

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.

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.

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 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.

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.

The utility model discloses a turn-over device. The turn-over device comprises a mounting seat, a first pressing mechanism, a second pressing mechanism and a turn-over mechanism, the second pressing mechanism comprises two lifting pressing assemblies; the turn-over mechanism comprises a plurality of blowing assemblies and pressing and folding assemblies. The utility model further discloses automatic top fly sewing equipment. According to the sewing machine, the first pressing mechanism is arranged and used for fixing sewing cloth; the lifting press-fit assembly is arranged to be used for pressing and loosening the folded part of the front fly material, the blowing assembly is arranged in cooperation to provide a blowing function to blow the folded part of the front fly material, the pressing and folding assembly folds the folded part of the front fly material, and automation is improved; according to the automatic top fly sewing equipment, full-automatic machining of automatic feeding of materials to be sewn, automatic top fly turning, sewing machining and discharging is achieved, the automation efficiency is improved, the labor intensity and cost of workers are reduced, and the production efficiency and quality of shirts are improved.

The utility model discloses a synchronous belt transmission sewing machine which comprises a sewing machine body, the sewing machine body is provided with a machine base, a sewing machine head and a rotating shuttle assembly, and a front section main shaft, a rear section main shaft, a front section auxiliary shaft and a rear section auxiliary shaft are arranged on the machine base. A lifting driving device is arranged on the machine base and drives the sewing machine head to ascend and descend so as to adjust the height of the sewing machine head. The front-section main shaft and the front-section auxiliary shaft are arranged on the sewing machine head; the rear-section main shaft is in transmission connection with the front-section main shaft through a first synchronous belt transmission device; the rear-section countershaft is in transmission connection with the front-section countershaft through a second synchronous belt transmission device; therefore, compared with a matching mode of protrusions and grooves, transmission matching among the first synchronous wheel, the second synchronous wheel, the first synchronous belt, the linkage synchronous wheel, the second synchronous belt and the sewing machine head has the advantages that sliding is avoided during sewing, the transmission ratio is accurate, the transmission efficiency is high, the sewing needle pitch is uniform, and the sewing quality consistency is good. And the working process of the sewing machine head is more stable.

The invention discloses an autonomous sewing system and method based on multi-modal sensing and self-adaptive control. The autonomous sewing system comprises a robot module, a sewing machine module, a visual sensing module and an intelligent control platform. According to the cloth pose registration module, high-precision registration of a flexible target is realized through a two-stage registration process, a local area weighting ICP and a non-rigid cloth surface registration method; the intelligent control module adopts a visual servo dynamic path tracking control method, dynamically corrects the posture of the robot, improves the path tracking precision and the sewing thread consistency, and ensures machine-machine collaborative synchronization and uniform sewing thread uniformity by constructing a speed, track and tension three-factor coupling synchronous control method. By adopting an error adjustment and tension stabilization mechanism based on self-adaptive control, the robustness of the system in a complex sewing state is improved; and through the data analysis module and the exception handling module, full-process monitoring, quality evaluation and exception grading response are realized, and the stability and reliability of the system are improved.

The invention relates to a thread trimming control method, a thread trimming control system and a sewing machine, the thread trimming control method comprises the following steps: arranging a first sensor, a second sensor and a third sensor which are arranged in sequence, the distance between the first sensor, the second sensor and the third sensor is L1, and the distance between the second sensor and the third sensor is L2; when the fabric reaches the second sensor from the first sensor, the controller calculates that the current stitch length of the sewing machine is O1 = L1 / N, and N is the number of turns of rotation of the sewing machine; the controller calculates the number of turns of rotation required by the sewing machine within the distance of L2, M = L2 / O1 = m + n, and m is an integer, 0 lt; nlt; 1; when ngt; k, when the fabric passes through the second sensor, the controller adjusts the stitch length of the sewing machine through the execution motor and the stitch length adjusting mechanism, so that the adjusted stitch length O2 meets the condition that L2 / O2 = x + y, and x is an integer, 0 lt; yt; Yt; 1, y < = k, 0.4 < = k < = 0.6; when n is smaller than or equal to k, the sewing machine continues sewing according to the stitch length of O1. According to the thread trimming control method, the thread trimming control system and the sewing machine, the problem that under the existing large-stitch-length sewing working condition, cloth and thread residues are very prone to being scattered is solved.

The invention discloses a clothing production effective labor hour accounting method and system based on the Internet of Things, and the method comprises the steps: obtaining the production assignment task data of a current sewing machine station, and judging whether the current sewing machine station is an effective labor station or not according to the production assignment task data; if yes, continuously monitoring and collecting a bottom-layer operation parameter sequence of the current sewing machine station through Internet of Things sensing equipment, and performing effective labor state judgment on the bottom-layer operation parameter sequence based on a predefined effective labor hour judgment logic rule; recording the duration of entering the effective working state each time by using a high-precision timer, and carrying out accumulation to generate effective working hour structured data; and generating a visual report and analysis data for performance management, production efficiency analysis and process optimization based on the effective man-hour structured data. Automatic accounting can be realized completely based on real operation data of the equipment, personal errors and faking are avoided, and justice, credibility, objectivity and accuracy of the data are ensured.

The invention relates to the technical field of sewing machine part machining, and discloses fixed cutter automatic shaping equipment which comprises a platform with a plurality of supporting legs, an operation cover is fixedly connected to the upper surface of the platform, a control cabinet is fixedly connected to the bottom face of the platform, and a hydraulic rod is fixedly connected to the top face of the inner wall of the operation cover. The output end of the hydraulic rod is fixedly connected with a detachable plate, the detachable plate is fixedly connected with a shaping pressing plate through a plurality of first bolts, and the upper surface of the platform is fixedly connected with a bottom plate. According to the automatic shaping equipment for the fixed cutter, an automatic feeding mechanism, a hydraulic rod, a shaping pressing plate, a conveying belt, a flatness sensor, a discharging opening and the like are integrated, the closed-loop automatic process of feeding, positioning, shaping, detecting and sorting is formed, and workers only need to place workpieces to be machined on a template block of the conveying assembly; subsequent procedures of chain plate conveying, electromagnet taking and placing, hydraulic shaping, conveying belt sorting and the like are automatically completed, the middle process does not need to be manually intervened, and the workpiece handling capacity in unit time is remarkably improved.

The invention discloses a cloth thickness detection method and system, a thread supply quantity control method and a sewing machine, and relates to the technical field of sewing machines, and the cloth thickness detection method comprises the steps: obtaining a time interval T of a time point when a machine needle passes through a stroke calibration point and a time point when the machine needle pierces the outer surface of cloth; the displacement H of the machine needle in the T is obtained; obtaining the distance H0 between the stroke calibration point and the needle plate; calculating the thickness H of the cloth according to the H0 and the H; according to the cloth thickness detection method and system, the thread supply quantity control method and the sewing machine, the thickness of the cloth is measured in an indirect measurement and calculation mode, the influence of different cloth types and different cloth compression conditions on the sewing thickness of the cloth is reduced, and parameters of the sewing machine are conveniently and accurately adjusted so as to guarantee the sewing effect.

A sewing system can include a sewing machine; a vacuum pump; and a polymer bag configured to hold a fiber preform and to connect to the vacuum pump so that gas inside the polymer bag is removable by the vacuum pump to thereby reduce a pressure inside the polymer bag to less than an ambient pressure of an outside of the polymer bag, and to compress the fiber preform to a compressed thickness thereby forming a compressed fiber preform, so that a pattern of stitches of a filament are stitchable through the polymer bag and the compressed fiber preform by the sewing machine while the pressure inside the polymer bag is less than the ambient pressure.

The invention discloses an upper thread sewing starting processing device and a sewing machine, and relates to the technical field of sewing machines, a needle plate assembly of the upper thread sewing starting processing device is provided with a needle plate hole, a thread grabbing plate and a thread clamping plate are movably assembled on the needle plate assembly, a thread trimmer is fixedly assembled on the needle plate assembly, the thread grabbing plate is provided with a thread grabbing hole, and the thread clamping plate is provided with a thread clamping head. The driving assembly is connected with the wire grabbing plate and the wire clamping plate and used for controlling the wire grabbing plate and the wire clamping plate to move. Wherein the moving route of the wire grabbing plate is a first route, and the moving route of the wire clamping plate is a second route; when the thread grabbing plate is located at the head end of the first route, the upper thread penetrates through the needle plate hole and the thread grabbing hole, and when the thread grabbing plate moves to the tail end from the head end of the first route, the upper thread is clamped by the thread clamping head and then cut off by the thread trimmer; when the thread clamping plate is located at the tail end of the second line, the thread clamping head loosens the upper thread. According to the upper thread sewing starting processing device, the upper thread can be clamped, cut off and loosened in one-time movement in the sewing starting stage, the movement process is simplified, and the sewing quality is improved.

The utility model provides equipment for sewing four edges of a throw pillow case. The equipment comprises a cloth feeding mechanism, a short edge sewing mechanism, a cutting mechanism and a long edge sewing mechanism, the cloth feeding mechanism comprises a first cloth placing frame, a second cloth placing frame and a cloth overlapping module; the short edge sewing module comprises two first sewing machines and two second sewing machines; the cutting mechanism comprises a cloth pulling frame and a cutting knife, and the cloth pulling frame comprises a movable cloth pulling clamp; the long edge sewing mechanism comprises a platform, a movable cloth moving rod is arranged above the platform, and third sewing machines are arranged at the two ends of the platform. Two rolls of cloth are placed on the first cloth placing frame and the second cloth placing frame respectively and overlapped through the cloth overlapping module. Cloth is sewn on the two sides through the two first sewing machines, then the two sides of the cloth are sewn towards the middle by a certain distance through the two second sewing machines, then the cloth is moved to the platform through the cloth pulling clamp to be cut, finally, the cloth is pushed by the cloth moving rod to be pressed and fixed towards the cloth pressing rods on the two sides, the bolster sleeve is formed through sewing of the third sewing machine, and the overall equipment structure and the manufacturing process are simple.

The utility model relates to the technical field of bag sewing, and provides an automatic sewing machine for a zipper box, which is used for solving the problem of unsafety of manual flanging operation and comprises a rack, an operation table top is arranged on the rack, a sewing machine is arranged on the operation table top, and a sewing guide block is arranged on a machine base of the sewing machine. The sewing guide block is detachably arranged on a machine base of the sewing machine, a positioning protrusion is arranged at the position, located below a needle head of the sewing machine, of the sewing guide block in an upward protruding mode, a sewing channel is vertically formed in the positioning protrusion in a penetrating mode, and the front end face and the rear end face of the positioning protrusion are arc-shaped faces adapting to corners of an external extrusion frame. A flanging block is arranged on the side, close to the inner side face of the sewing machine body, of the sewing guide block, an arc-shaped turning face is arranged on the outer side face of the flanging block, a sewing opening is formed in the flanging block in an up-down penetrating mode, and a first driving structure is arranged on the rack.

The utility model provides a sewing machine, 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 rotating shuttle located below the needle plate, a thread shifting rod and a rotating piece capable of horizontally rotating, a guide piece located on the side portion of the rotating shuttle and capable of horizontally swinging is arranged on the base, the thread shifting rod comprises a rod body and an arc-strip-shaped thread shifting head, and the rod body is connected to the guide piece in a sliding mode in the axial direction of the rod body. One end of the thread pulling head is fixedly connected to the end, close to the rotating shuttle, of the rod body and bent upwards relative to the rod body, the other end of the rod body is rotationally connected to the position, deviating from the rotating center of the rotating piece, of the rotating piece, and when the rotating piece drives the rod body to move, the other end of the thread pulling head can be located between the needle falling hole and the rotating shuttle. According to the utility model, the sewing quality is further improved, and the manufacturing cost is obviously reduced on the basis.

The utility model belongs to the technical field of sewing machine technologies, and relates to an anti-interference type multi-light-eye correlation structure and a sewing machine thereof, a thread trimming switch assembly is arranged on a machine head of the sewing machine, and a thread trimmer assembly is arranged in a machine shell. A plurality of light eyes electrically connected with an electric control module of the sewing machine are sequentially arranged in the cloth feeding direction of the sewing machine, and emitters and inductors of the light eyes are arranged on the machine shell and the thread trimming switch assembly respectively to form an up-down correlation structure. Wherein the inductor of at least one light eye is arranged on the thread trimming switch assembly, and the inductor of the adjacent light eye is arranged on the machine shell. According to the anti-interference type multi-light-eye correlation structure and the sewing machine with the anti-interference type multi-light-eye correlation structure, the effects of accurate control and short thread ends can be achieved.

The utility model discloses a braid splicing device which comprises a supporting seat, a first transmission column, a second transmission column, a limiting portion, a sewing machine, a power component and a controller, the first transmission column and the second transmission column are arranged on the supporting seat, and the position of the first transmission column and / or the second transmission column relative to the supporting seat can be adjusted. The first transmission column and / or the second transmission column are / is connected with the power component, the controller is electrically connected to the power component and the sewing machine, when the braid is wound around the first transmission column and the second transmission column, the braid is located on the inner side of the limiting part, the limiting part is used for abutting against the braid to enable the braid to move towards the inner side, and the controller can control the power component to operate. The first transmission column and / or the second transmission column are / is driven to rotate, the sewing machine is synchronously controlled to operate, and adjacent braids can be spliced. According to the device for splicing the ribbon and other strip-shaped objects, manpower and material resources are saved, large carpets / ground mats can be formed, and application and popularization are facilitated.

The utility model discloses an anti-nest thread bonding device and a sewing machine in the technical field of sewing machines. The anti-nest thread bonding device comprises an auxiliary thread trapper. The connecting end of the wire bonding plate is connected with the auxiliary wire clamping device, and the wire bonding end of the wire bonding plate and the auxiliary wire clamping device can rotate relative to each other; the wire bonding driving assembly is arranged on one side of the auxiliary wire clamping device, and the wire bonding driving assembly is provided with a wire bonding iron core shaft capable of axially moving in a reciprocating mode; the connecting rod is arranged between the wire bonding plate and the wire bonding driving assembly, one end of the connecting rod is hinged to the wire bonding iron core shaft, and the other end of the connecting rod is hinged to the wire bonding plate, so that the wire bonding end of the wire bonding plate is driven to swing through axial movement of the wire bonding iron core shaft. The thread bonding mechanism not only realizes the thread bonding action and prevents the generation of bird nests, but also has the advantage of simple structure, simultaneously avoids the problem that the hand is blocked by the operation space of the machine head, and enables the sewing machine to have a neat appearance.

The utility model discloses full-automatic interior trim clamping strip sewing equipment which comprises a machine base and an automatic material feeding mechanism arranged on one side of the machine base. The positioning assembly is arranged on the machine base and is adjacent to the automatic material feeding mechanism; the sewing machine is arranged on the machine base and used for sewing; a four-axis conveying mechanism is arranged between the positioning assembly and the sewing machine and connected with a material pressing and feeding piece. The clamping strip feeding mechanism is arranged on the other side of the machine base and used for feeding clamping strips one by one; the clamping strip clamping and conveying mechanism is connected with the clamping strip feeding mechanism, the clamping strip clamping and conveying mechanism is provided with a clamping strip clamp, and the clamping strip clamp clamps a clamping strip and conveys the clamping strip to a sewing machine to be sewn with materials in an overlapped mode; the automatic discharging mechanism is arranged on one side of the sewing machine and used for collecting the products moved out by the four-axis conveying mechanism. The automatic feeding and sewing machine can achieve feeding and sewing automation, replaces manual work, improves production efficiency and improves quality.

The utility model relates to the technical field of sewing equipment, in particular to an improved thread trimming mechanism of a sewing machine, which comprises a thread trimming structure, and the thread trimming structure comprises a movable cutter unit and a fixed cutter matched with the movable cutter unit for use; the movable cutter unit comprises a driving part, an annular supporting seat, a mounting part integrally formed with the annular supporting seat and a cutter, the cutter is mounted on the mounting part through a fastener, a first blade part is arranged on the cutter, and a second blade part meshed with the first blade part is arranged on the fixed cutter; the driving piece drives the annular supporting base to rotate so as to drive the first blade part of the cutter to approach the second blade part of the fixed cutter to cut off the thread residues. According to the thread trimming structure, the complex structure of a traditional thread trimming mechanism is simplified, and the manufacturing and maintenance cost is reduced. Meanwhile, the conveying mechanism is composed of a first gear, a second gear and a conveying belt, belt conveying transmits power through friction or synchronous gear meshing, instant impact force can be effectively reduced, and the problems of vibration and noise caused by rigid transmission are solved.

A sewing machine has a throat plate (3a) and a material hold-down foot (13) for performing a lifting movement to hold down the material on the throat plate (3a) during a sewing operation. A driven stroke amplitude adjusting device (17) serves to adjust a stroke amplitude of the lifting movement of the material hold-down foot between a top dead center and a bottom dead center. A driven stroke level adjusting device serves to adjust a stroke level of the lifting movement of the material hold-down foot (13) relative to the throat plate (3a). A control / regulating device (11) is in signal communication with the stroke amplitude adjusting device (17) and with the stroke level adjusting device. Operating methods that are possible with the sewing machine are also specified. The result is a sewing machine with which sewing material of different thicknesses and / or different numbers of layers can be sewn precisely and flexibly.

The present application particularly relates to a sewing machine for realizing intermittent cloth feeding operation, comprising a cloth feeding assembly and an intermittent driving assembly. The cloth feeding assembly comprises a cloth feeding wheel and a transmission rod connected to the cloth feeding wheel. The intermittent driving assembly comprises a driving body, a planetary gear assembly connected to the driving body and driving the transmission rod based on the driving body. The driving body has an axis, an eccentric wheel arranged at the axis, and an output connected to the eccentric wheel and the planetary gear assembly. The eccentric wheel is shaped with a plurality of first teeth at the outer edge. The output is shaped with a plurality of second teeth matched with the first teeth. The eccentric wheel performs an elliptical motion relative to the output after being driven by the axis. The output outputs kinetic energy to the planetary gear assembly only when the first teeth engage the second teeth.

The invention relates to the technical field of sewing equipment, in particular to a thread locking device and a sewing machine. The thread locking device comprises a machine body, a thread locking module, a bottom thread clamping module and a bottom thread tightening module, and a curved needle is installed in the machine body and used for driving a bottom thread to move. The thread locking module comprises a first driving part, a connecting rod assembly and a thread locking knife, the first driving part is installed on the machine body, the output end of the first driving part is connected with the connecting rod assembly, and the thread locking knife is installed at the end, away from the first driving part, of the connecting rod assembly; and the thread locking knife is driven to move towards or away from the curved needle. The bottom line clamping module is installed on the machine body and used for clamping a bottom line during line locking so as to prevent the bottom line from moving. The bottom thread tightening module is installed on the machine body and used for pulling the bottom thread during thread locking so as to tighten the bottom thread. According to the thread locking device and the sewing machine, the problem that an existing sewing machine thread locking device is low in thread locking success rate is solved.