126results about "Tensioning devices" patented technology

A composite sewing head, including: a needle bar transport for a thread feed needle and a thread catcher needle that is arranged to be parallel to a needle plane of the thread feed needle and a thread catcher needle, with the needle plane parallel or nearly parallel to a stitch path.

The invention discloses an active tension control device and control method for a unilateral sewing thread of a composite preform, and the device comprises a tension control drive unit, a sensing monitoring unit, a thread guide unit and a thread consumption unit, and the tension control drive unit comprises a tension control motor and a thread roller; the sensing monitoring unit comprises a tension sensor, a laser distance measuring sensor and a sewing action driving encoder, the thread guide unit mainly assists in transferring a sewing thread from a thread releasing area to a working area and comprises a thread guide wheel and a porcelain eye, and the thread consumption unit is a sewing working area. According to the control method, the speed control ring and the tension control ring jointly achieve tension control, the speed control ring combines the rotating speed of a real-time sewing action driving motor and the diameter of a real-time thread roller to achieve coarse adjustment, and then closed-loop real-time tension adjustment is achieved through the controller. By means of the active tension control method and device for the single-side sewing thread of the composite prefabricated body, active control over the sewing tension can be achieved, and the sewing quality of the prefabricated body is effectively improved.

The invention relates to the technical field of thread tension adjusting control, in particular to a thread tension self-adaptive adjusting method of a flat sewing machine. Current and historical line tension time sequence data are obtained, and data support is provided for adjustment. By comparing the difference between the current tension and the historical preset tension, a tension deviation index is determined, and abnormal fluctuation is found preliminarily. Thirdly, comparing the numerical difference of the tension time sequence data of each line and the change along with time, determining a tension characteristic value, and reflecting the tension change condition; and integrating the current deviation index and the deviation of all the tension characteristic values to obtain a current tension adjustment degree value so as to realize comprehensive evaluation. In order to achieve more accurate adjustment, the current adjustment value is adjusted based on the deviation index and the adjustment degree value of the historical monitoring period to obtain a new value, so that the adjustment is more continuous and stable. Finally, according to the new adjustment value, the current preset tension and the historical preset tension, the self-adaptive tension value of the next period is determined, dynamic and self-adaptive adjustment is achieved, and the accuracy is improved.

The utility model discloses a take-up device of a sewing machine, which comprises a machine head, a take-up device is arranged on the machine head, the take-up device comprises a mounting frame, a motor, a rotating frame and a thread trapper, the mounting frame is fixed on the machine head, the motor is mounted on the mounting frame, and a motor shaft of the motor penetrates through the mounting frame and the rotating frame to be fixedly connected with the motor shaft; the yarn trapper comprises a push rod, an installation part, a spring, a fixing cap and a clamping piece assembly, the yarn trapper is installed on the rotating frame, the push rod is installed in a sliding mode relative to the installation part, a jacking inclined table is arranged on the installation frame, and the motor drives the yarn trapper on the rotating frame to rotate, so that the push rod correspondingly abuts against or is away from the jacking inclined table. When the sewing machine is used for thread drawing, the thread take-up device can be well matched with the sewing machine to work and quickly act, and is timely matched with other devices to press threads, so that the sewing machine can better draw the threads, the technical defects existing in an existing structure are overcome, and the thread residue phenomenon of a bird nest is effectively prevented.

To adjust thread delivery amount between an upper looper thread T3 and a lower looper thread T4 and individually adjust thread tension so that the upper looper thread T3 and the lower looper thread T4 do not restrict each other.SOLUTION: An overcasting sewing machine 100 comprises: a first input part 32 to move a needle thread adjusting part 24 along an intersection direction; a second input part 33 to interlock and move an upper looper thread adjusting part 25 and a lower looper thread adjusting part 26 along the intersection direction; an adjustment interlocking part 27 to interlock the upper looper thread adjusting part 25 and the lower looper thread adjusting part 26 during movement of the needle thread adjusting part 24; and a third input part 37 to input adjustment of relative positions along the intersection direction of a thread locking part 251 of the upper looper thread adjusting part 25 and a thread locking part 261 of the lower looper thread adjusting part 26 while allowing interlocking by the second input part 33 and the adjustment interlocking part 27.SELECTED DRAWING: Figure 16

The invention discloses an automatic take-up tension control method of a template machine, and belongs to the technical field of textile. The invention aims to solve the problems of low tension control precision and poor adaptability caused by insufficient nonlinear interference compensation, lack of multi-working-condition collaborative analysis and high manual dependency in the prior art. According to the method, the cloth thickness is collected in real time through a thickness sensor, and a yarn consumption predicted value is output through a core model in combination with the stitch length; the AI module feeds back dynamic optimization model parameters based on the broken line record and the stitch tightness, and generates accurate line consumption; a servo motor is driven on the basis of the difference between the value and the standard quantity, and the rotation angle of the motor is converted into the angular displacement of the take-up-lever through a four-bar mechanism composed of a coupler, an eccentric shaft and the take-up-lever. By combining closed-loop feedback of a displacement sensor and spindle phase collaboration and integrating AI anomaly diagnosis, a self-optimization system driven by historical data is constructed, and tension stability and stitch quality under complex working conditions are continuously improved.

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 invention relates to the technical field of sewing machines, in particular to a multi-thread-trapper thread tension adjusting device which is characterized in that a driving motor drives a rotating shaft to rotate; the plurality of adjusting mechanisms are arranged in one-to-one correspondence with the adjusting nuts of the plurality of wire trappers; the adjusting mechanism comprises a friction wheel arranged opposite to the adjusting nut, a transmission piece connected with the rotating shaft and the friction wheel so as to drive the friction wheel to rotate, and a clutch piece connected with the friction wheel and driving the friction wheel and the adjusting nut to be pressed or not pressed. The invention further relates to a multi-yarn-trapper yarn tension adjusting method which adopts the device and comprises automatic adjustment and manual adjustment. The automatic adjustment is that the adjusting nuts of all the wire trappers or one or more of the wire trappers are compressed with the friction wheel, the driving motor drives the friction wheel to rotate through the rotating shaft and the transmission piece, and the friction wheel compressed with the adjusting nuts drives the adjusting nuts to rotate; the manual adjustment is that the adjusting nut of the wire clamp and the friction wheel are not tightly pressed, and the adjusting nut is manually rotated. Automatic synchronous or independent adjustment of the tension of the multi-thread-trapper thread can be achieved.

The invention relates to a template machine, and belongs to the technical field of sewing equipment, the template machine comprises a central shaft, a guide pipe, an upper joint and a lower joint, the central shaft is internally provided with an air channel and a thread channel, the side surface of the central shaft is provided with an air inlet part and an air outlet part, the central shaft penetrates through the central channel, the upper joint is provided with a first interface, and the central shaft is sleeved with the upper joint in a sealing manner; the first interface is communicated with the air inlet part; the second joint is provided with a second interface, the second joint is arranged on the central shaft, and the second interface is communicated with the air outlet part; the thread coil is arranged on the cantilever, and a sewing thread enters the thread channel from the upper part of the machine head; the guide pipe is arranged in the machine head and connected with the central shaft, and the lower end of the guide pipe extends to the side face of the machine head; according to the template machine, an integrated solution of power supply, air supply and thread supply of the rotating machine head is provided, the sewing speed and the sewing effect are improved, the assembly structure is simpler, the needed assembly space is smaller, the cost is lower, and the market requirement is better met.

This invention relates to the field of sewing machine technology, and discloses a thread-releasing and presser foot lifting mechanism for a sewing machine and a sewing machine. The mechanism includes a thread-releasing assembly for opening the thread clamp and a presser foot lifting assembly. The thread-releasing assembly includes a top plate rotatable around a pivot and a thread-releasing pin. The top plate is driven to rotate around the pivot by the presser foot lifting assembly, thereby causing the thread-releasing pin to open the thread clamp and perform a thread-releasing action. The presser foot assembly includes a presser foot rod and a presser foot. The presser foot lifting assembly includes an adjusting block fixedly mounted on the presser foot rod and a manual presser foot lifting component. A toggle block is provided on the rear side of the adjusting block. The presser foot assembly also includes an adjusting component for adjusting the presser foot lifting height and pressure. By using the top plate and the thread-releasing pin, when the presser foot is lifted by the presser foot lifting assembly, it is driven to rotate around the pivot, thereby causing the thread-releasing pin to open the thread clamp and perform a thread-releasing action. This ensures that the thread clamp automatically completes the thread-releasing action during the presser foot lifting process, thus simplifying the structure and improving working accuracy.

The invention relates to the technical field of sewing machines, in particular to a thread tension adjusting device for multiple thread trappers, a driving motor drives a transmission mechanism to drive an adjusting motor to linearly move along the arrangement direction of the multiple thread trappers, the adjusting motor drives a friction wheel to rotate, and a clutch drives the friction wheel to be compressed or not compressed with adjusting nuts of the thread trappers. The invention further relates to a thread tension adjusting method of the multi-thread trapper, and the thread tension adjusting method adopts the device and comprises automatic adjustment and manual adjustment. The automatic adjustment is that an adjusting motor is opposite to a certain wire clamp, a friction wheel and an adjusting nut of the friction wheel are pressed tightly, and the adjusting motor drives the friction wheel to drive the adjusting nut to rotate; the manual adjustment means that the adjusting motor is not opposite to the wire trapper to be manually adjusted, or the friction wheel is not tightly pressed with an adjusting nut of the wire trapper to be manually adjusted, and the adjusting nut is manually rotated. And automatic and high-precision adjustment of the tension of the threads of the multiple thread trappers can be realized.

The invention discloses an overlock machine thread take-up and thread trapper dynamic adjusting device and an overlock machine, and relates to the technical field of sewing. The technical problems that in the prior art, when thin fabric is sewed by an overlock machine, the fabric wrinkles due to the fact that the tension of machine needles and threads is too large are solved, and meanwhile it is guaranteed that stitches are compact and attractive are solved. The adjusting device comprises a machine shell, a take-up lever, a main shaft and a machine needle thread trapper, the machine needle thread trapper comprises a thread trapper shaft and is provided with a machine needle thread trapper dynamic adjusting mechanism, and the machine needle thread trapper dynamic adjusting mechanism comprises a double-spring structure arranged on the thread trapper shaft in a sleeving mode; the rotating shaft is linked with the main shaft; the eccentric wheel is arranged on the rotating shaft; the sliding rod assembly is connected with the eccentric wheel and the yarn trapper shaft; an external thread adjusting structure is arranged at the front end of the yarn trapper shaft; when the main shaft rotates, the eccentric wheel and the sliding rod assembly enable the pressure of the thread trapper to be increased in the needle stabbing stage and decreased in the needle ascending stage. The adjusting device has the advantages that the thin fabric is effectively prevented from wrinkling during sewing, and meanwhile, the stitch can be kept compact and attractive.

The utility model relates to sewing machine technical field discloses a thread unwinding device for sewing machine, including mounting panel, the first threaded rod that has the screw engagement in mounting panel, the bottom fixed mounting of first threaded rod has first knob, this thread unwinding device for sewing machine, rotates first knob to make first threaded rod drive fixed plate to move upwards to make fixed plate and mounting panel cooperation to install thread unwinding device, the friction layer that is provided on fixed plate simultaneously, therefore this can better increase the friction between fixed plate and sewing machine desktop, after rotating third knob to make bidirectional threaded rod rotate, when bidirectional threaded rod rotates can drive moving block to adjust distance in the sliding slot to make the tension of guide coil to sewing thread unwinding to adjust to can better prevent thread unwinding device sewing thread tight or too loose when unwinding appears the situation, and influence the sewing effect of sewing machine.

The utility model discloses a sewing thread clamping device of a sewing machine. The sewing thread clamping device comprises a driving motor, a buffering piece, a connecting rod, a pull rod, a thread clamping piece and a fixing block. The driving motor is connected with a fixed shaft sleeve, the connecting rod is linked with the fixed shaft sleeve, the buffer piece is respectively connected with the connecting rod and the fixed shaft sleeve, the other end, far away from the fixed shaft sleeve, of the connecting rod is movably connected with one end of the pull rod, and the other end of the pull rod is connected with the thread clamping sheet; the thread clamping piece comprises a thread clamping connecting part and a thread clamping clamping part, a rotating shaft is arranged between the thread clamping connecting part and the thread clamping clamping part, the fixing block is arranged below a machine needle and is adjacent to the thread clamping piece, and the thread clamping clamping part rotates around the rotating shaft and abuts against the fixing block to clamp a sewing thread. According to the utility model, the sewing stability can be effectively improved, and the sewing off-line and bird nest phenomena are reduced.

The utility model discloses an integrated thread trapper and a sewing machine in the technical field of sewing machines. The integrated thread trapper comprises a thread passing plate, an outer switching sleeve and an inner switching shaft. An outer reset spring and an inner reset spring are arranged on one side of the wire passing plate, the outer switching sleeve is in sliding connection with the wire passing plate in the axis direction, the inner reset spring is connected between the wire passing plate and the outer switching sleeve, the inner switching shaft is sleeved with the outer switching sleeve in an axial moving mode, and the outer reset spring is connected between the wire passing plate and the inner switching shaft; a thread clamping piece, an outer supporting pad and an inner supporting pad are arranged on the other side of the thread passing plate, the thread clamping piece and the outer supporting pad are arranged on the outer switching sleeve in a sleeving mode, and the inner supporting pad is arranged on the inner switching shaft in a sleeving mode. According to the sewing machine clamping device, free adjustment and gear adjustment of the sewing thread clamping force are achieved, a user can directly use fabric conforming to the preset clamping force for sewing according to needs, the clamping force of the clamping device can also be freely adjusted, and the adjusting efficiency of the sewing thread clamping force is improved.

The application discloses a thread clamping and cutting device and a sewing machine, which comprises a mounting seat, a sliding plate, a thread clamping plate, a thread cutting plate, a transmission plate and a driving rod. The mounting seat is fixed to the sewing machine and located below a needle plate. The sliding plate is movably connected to the mounting seat. The thread clamping plate is installed on the sliding plate. The thread cutting plate is installed on the sliding plate. The transmission plate is connected with the thread clamping plate and the thread cutting plate. The driving rod is connected with the transmission plate. The driving rod drives the transmission plate to move. In the process that the driving rod moves from the first end to the second end of the stroke, the thread clamping plate, the thread cutting plate and the sliding plate are sequentially driven to move to realize the actions of clamping the sewing thread, cutting the sewing thread and moving the sliding plate from the initial position to the avoiding position in the moving direction of the driving rod. By sequentially clamping and cutting the sewing thread, the stability of the sewing hooking thread can be ensured, so that the occurrence of the bird nest is reduced. After the thread is cut, the sliding plate moves to the avoiding position to avoid the interference caused by the moving cutter below the needle plate.

The utility model belongs to the technical field of sewing machines, and particularly relates to a flat seaming machine. Comprising a rotary driving part, a presser foot lifting driving assembly, a thread trimming driving assembly and a stitch length adjusting driving assembly, the rotary driving part comprises a rotary part, and a presser foot lifting cam, a thread trimming cam and a stitch length adjusting cam are arranged on the rotary part; the presser foot lifting cam, the thread trimming cam and the stitch length adjusting cam respectively drive the presser foot lifting driving assembly, the thread trimming driving assembly and the stitch length adjusting driving assembly to execute presser foot lifting, thread trimming and stitch length adjusting actions without mutual interference; according to the utility model, the rotary driving piece is combined with the position relation of the stitch length adjusting cam, the thread trimming cam and the presser foot lifting cam, so that the execution of stitch length adjusting, thread trimming, thread loosening and presser foot lifting actions is realized without mutual interference, the structure is compact and simplified, the number of parts is reduced, and the part cost is reduced.

The invention discloses a flat seaming machine presser foot lifting air suction thread clamping device and aims to provide a flat seaming machine presser foot lifting air suction thread clamping device which is simple in structure and convenient to manufacture. The presser foot lifting air suction thread clamping device of the flat seaming machine can effectively solve the problem that after the flat seaming machine cuts threads every time, when sewing is started next time, due to the fact that the thread clamping force of upper threads is insufficient, the sewing is prone to loosing. The device comprises a fixed part which is fixedly arranged on a machine head of the flat seaming machine and comprises a fixed thread pressing part which is located between a sewing needle and a presser foot rod of the flat seaming machine; the air suction pipe comprises an air suction port which is located between the sewing needle and the fixed thread pressing part; the elastic element is arranged on the fixed part and comprises an elastic arm and a thread pressing part arranged on the elastic arm, the thread pressing part and the sewing needle are located on the same side of the fixed thread pressing part, and the thread pressing part abuts against the fixed thread pressing part under the action of the elastic arm; the push plate is fixed on the presser foot rod; when the presser foot rod drives the presser foot to ascend, the push plate abuts against the elastic arm and enables the line pressing piece to be separated from the fixed line pressing part.

The invention provides a control method for thread end stability during thread trimming and a sewing machine. The sewing machine comprises a main shaft, a control assembly, a thread bonding mechanism, a main thread clamping device, a thread take-up lever and a machine needle, and the control assembly is connected with the thread bonding mechanism and the main thread clamping device; the upper thread penetrates through the thread bonding mechanism and then penetrates through a needle hole of the machine needle through the main thread clamping device and the thread take-up lever. According to the control method for the stability of the thread end in the thread trimming process and the sewing machine, the thread bonding mechanism and the main thread clamping device are arranged, before thread trimming, the main thread clamping device clamps the upper thread, meanwhile, the thread bonding mechanism works, and therefore the thread bonding mechanism can draw the thread from the thread frame. When the thread is trimmed, the main thread clamping device loosens the upper thread, the thread amount pre-stored at the position of the thread bonding mechanism is extracted in the ascending process of the take-up lever, the upper thread cannot be extracted from the position of the machine needle, and therefore it can be guaranteed that the length of the thread end remaining on the machine needle after thread trimming is close to a set value.

The utility model discloses an electromagnetic auxiliary thread trapper and a sewing machine in the technical field of sewing machines, and the electromagnetic auxiliary thread trapper comprises an electromagnet, a thread clamping piece, an adjusting check block, a spring, a knob and an installation mandrel, a magnet cover plate is installed at one end of the electromagnet, and an iron mandrel capable of moving axially is arranged in the electromagnet; one end of the mounting core shaft axially penetrates through the magnet cover plate and is fixedly connected with the iron core shaft; the two thread clamping pieces sleeve the mounting mandrel face to face, the knob is fixedly connected with the other end of the mounting mandrel, and the spring is mounted between the knob and the thread clamping pieces; and the adjusting stop block is fixedly mounted on the mounting mandrel and is positioned between the knob and the thread clamping sheet. The thread trapper not only has the thread clamping function of a mechanical thread trapper, but also can change the clamping force to the sewing thread through the electromagnet, so that the automatic adjustment of the clamping force to the sewing thread by the thread trapper is realized.

The invention discloses a thread tension adjusting device and a sewing machine, relates to the technical field of sewing equipment, and aims to solve the problems that an existing electromagnet-driven thread tension adjusting device is low in response speed, thread tension is reduced due to long-time operation, and the thread loosening speed lags behind. The motor is arranged on one side of the supporting structure; the wire clamping mechanism and the motor are oppositely arranged on the other side of the supporting structure, the wire clamping mechanism comprises a cam and a wire passing wheel, the cam is connected with a motor shaft of the motor, and the outer edge of the cam is attached to a wire passing groove of the wire passing wheel; by means of the arrangement, high-precision, quick-response and long-term stable thread tension control is achieved through motor driving, meanwhile, the thread loosening performance is optimized, and the overall performance of the sewing machine is remarkably improved.

The present application relates to sewing technical field, especially a kind of thread tension adjusting device, comprising: thread clamping mechanism, including mounting block and the first thread clamping piece and second thread clamping piece movably arranged on the mounting block, the first thread clamping piece is oppositely arranged with the second thread clamping piece and has the gap for accommodating suture;Driving mechanism, including rotating member, transmission assembly and pressure cylinder, one end of the transmission assembly is connected with the rotating member, the other end is connected with the pressure cylinder, the side of the pressure cylinder close to the transmission assembly is abutted with the second thread clamping piece, by driving the rotating member rotates, can make the transmission assembly drive the pressure cylinder moves, to make the second thread clamping piece relatively the first thread clamping piece moves. Only need to control the rotation angle of rotating member can control the gap size between two thread clamping pieces, in turn change the size of thread tension, the whole process can be adjusted thread tension in real time during sewing machine sewing process, adjustment is simple and convenient, higher accuracy.

The invention relates to the technical field of textile processing, and discloses a yarn carding device for hemming sewing processing, which comprises a workbench, a base is arranged on one side of the upper surface of the workbench, a first thread stand is arranged on the upper surface of the base, and second fixing rings are symmetrically arranged in the middle of the outer wall of the first thread stand. A sliding groove is formed in the second fixing ring, first rotating shafts are symmetrically and slidably connected into the sliding groove of the second fixing ring, second pawls are arranged on the outer walls of the first rotating shafts, second ratchet wheels are arranged at one ends of the second pawls, and the middle portions of the second ratchet wheels are fixedly arranged on the outer wall of the first coil holder. Flexible adjustment of related structures of the coil holder is achieved through cooperation of the second pawl and the second ratchet wheel and the coil holder. The angle of the yarn wheel frame can be changed according to actual requirements, so that the position of a bobbin placed on the tray can be correspondingly adjusted, and the phenomena of winding and knotting of yarns in the conveying process are effectively reduced. The problem that the coil holder cannot be adjusted is solved.

A sewing machine presser foot being attached to a presser foot bar provided near a needle bar via a presser foot support member in a sewing machine, the sewing machine including a throat plate and a needle bar up-down movement mechanism configured to cause an up-down movement of the needle bar holding a sewing needle. The sewing machine presser foot includes: a first presser foot and a second presser foot supported by the presser foot support member; a first presser foot portion supported to be movable up and down in conjunction with the up-down movement of the needle bar; a second presser foot portion supported to be movable up and down; and an adjustment portion configured to adjust a height position of the second presser foot portion with respect to the throat plate.

The utility model discloses an electronic thread trapper for a sewing machine, which relates to the field of sewing machine components, solves the problem of weak magnetic attraction force caused by direct attraction of an existing electromagnetic coil seat, and adopts the following scheme that the electronic thread trapper comprises a lower seat component and an upper seat component assembled on the top side of the lower seat component, a spiral cylinder is fixedly installed at the bottom of the inner side of the shell, an electromagnetic coil seat is sleeved with an inner cavity of the shell, the input end of the electromagnetic coil seat is electrically connected with a wire, a spacer ring is arranged between the top side of the electromagnetic coil seat and the upper seat assembly in a cushioned mode, and sewing machine threads are clamped between the upper supporting plate and the lower supporting plate; according to the electronic thread trapper for the sewing machine, the distance ring is arranged between the lower base assembly and the upper base assembly, the magnetic circuit of the coil can be increased through the distance ring, the efficiency and the stability of an electric appliance are improved, and due to the fact that iron has good magnetic permeability, magnetic field lines can be attracted, and the magnetic flux in the coil is enhanced.

The invention discloses a single-needle-driven double-layer lap joint splicing device and a sewing method thereof, and belongs to the technical field of textile. The transmission module, the thread picking module and the thread guiding and hooking module are synchronously controlled through the driving module, so that the modules are highly coordinated, and the problems of mesh hooking, stitch disorder and the like caused by synchronous errors of a traditional multi-power source are solved; the staggered distribution design of the thread guiding curved needle and the fixed thread hooking needle is matched with the protruding structure of the needle point of the thread guiding curved needle to assist knocking-over, hooking and pulling damage to regular meshes of the metal mesh can be reduced, and the splicing strength can be guaranteed through the accurate coil sleeving action; and through combination of passive regulation and active regulation, the stability of the splicing quality is remarkably improved. The single-needle-driven double-layer lap joint splicing device is simple in structure, excellent in movement synergy and controllable in tension, and splicing precision, structural integrity and production efficiency are improved.

The invention provides an upper thread anti-off sewing method of a sewing machine and the sewing machine. A thread passing notch and a first clamping part are arranged on a first thread trimmer of the sewing machine, a clamping assembly is further arranged, and the clamping assembly is provided with a second clamping part; comprising the following steps that before a first needle is sewed, a first thread trimmer stops at a working position A, and a thread passing notch is located under a machine needle; starting to sew a first needle, enabling a machine needle to move downwards, and driving an upper thread to pass through a thread passing notch and a sewing material; then the rotating shuttle hooks the upper thread, the machine needle ascends to the position above the first thread trimmer, and the upper thread is located in the thread passing notch; the first thread trimmer moves towards the clamping assembly to a working position B, the thread passing notch drives the upper thread in the thread passing notch to reach a second clamping part of the clamping assembly, the first clamping part and the second clamping part clamp the upper thread between the first clamping part and the second clamping part, and the first thread trimmer stops at the working position B; the machine needle completes follow-up sewing starting actions of a plurality of needles; when the first thread trimmer moves to the working position C, the first clamping part and the second clamping part loosen the upper thread.

The utility model relates to the technical field of sewing machines, in particular to a single-needle sewing machine feeding direction correcting device which comprises a garment processing table, a machine base is fixedly installed on the garment processing table, a single-needle sewing machine is installed on the machine base, and a feeding direction correcting mechanism is arranged on the outer side of the single-needle sewing machine. The feeding direction correcting mechanism comprises a mounting bottom plate, a bending side plate is mounted on the side edge of the mounting bottom plate in a threaded connection mode, a first guide wheel, a second guide wheel and a third guide wheel are sequentially mounted on the mounting bottom plate and the bending side plate, a mounting groove is formed in the upper side of the mounting bottom plate, a fixing column is fixedly mounted in the center of the inner side of the mounting groove, and a sliding groove is formed in the upper side of the fixing column. By means of the feeding direction correcting mechanism, when the single-needle sewing machine stops working, the stranding cylinder can immediately stop autorotation caused by inertia, looseness in a thread feeding line is prevented, the defect of thread winding is further avoided, and practicability of the single-needle sewing machine is improved.

The invention provides a thread clamping device capable of periodically adjusting thread tension in real time and a sewing machine, the thread clamping device comprises a thread clamping device main body, a driving motor and a thread clamping transmission assembly, the thread clamping device main body comprises a thread clamping rod, a thread clamping spring, a first thread clamping sheet and a second thread clamping sheet, and the driving motor is connected with the thread clamping rod through the thread clamping transmission assembly; in the operation process of the sewing machine, the machine needle reciprocates up and down, and the driving motor drives the thread clamping rod to periodically move back and forth, so that the compression amount of the thread clamping spring is gradually reduced in the downward moving process of the machine needle and is gradually increased in the upward moving process of the machine needle, and the compression amount of the thread clamping spring is periodically reduced and increased; the thread tension of the sewing thread penetrating between the first thread clamping piece and the second thread clamping piece is periodically reduced and increased, the purpose that the thread tension is periodically adjusted in real time in the mode that the thread tension is matched with vertical reciprocating motion of a machine needle along with operation of the sewing machine is achieved, a thread ring can be stably formed and tightened, and sewing quality is improved.