1470results about "Sewing-machine control devices" patented technology

Embodiments of present disclosure relates to a robot and method for sewing an object. The robot includes a first robotic arm adapted to hold a needle, the needle carrying a length of a thread, a second robotic arm adapted to hold the needle, and a controller configured to move the first and second robotic arms to perform a plural of sewing operations so as to form a plural of stitches on the object A sewing operation includes moving the first robotic arm a first distance to cause the needle to penetrate a part of the object; and moving the second robotic arm to hold a penetration portion of the needle and pull the whole needle out of the object after the needle being released by the first robotic arm.

The utility model relates to a modular linkage adjusting mechanism used for a pocket patching machine and the pocket patching machine, the modular linkage adjusting mechanism used for the pocket patching machine comprises a base plate and at least two sets of folding assemblies, each set of folding assembly comprises a unit wall, the unit wall is installed on the base plate in a position-adjustable mode, and the unit wall is arranged on the base plate; the unit walls of all the folding assemblies are matched with one another to define a shape-adjustable female die. The folding knife is provided with an initial position and a working position relative to the base plate, the folding knife is movably connected with the unit wall so as to be switched between the initial position and the working position, and the folding knife is further adjusted in position along with the unit wall. According to the modular linkage adjusting mechanism for the patch pocket machine, modular design is adopted, the folding knife and the female die can be adjusted in a linkage mode, and the working efficiency and the adjusting precision and stability are further improved.

To reduce power consumption of a sewing machine.SOLUTION: A sewing system comprises: a plurality of sewing machines that operate in a normal mode and a low power waiting mode to wait with a lower power consumption than the normal mode; and a control part connected to the plurality of sewing machines through network. The control part acquires information relating to operating state from the plurality of sewing machines and transmits instruction to shift to the low power waiting mode to the sewing machine with the operating state satisfying a mode switching condition among the plurality of sewing machines.SELECTED DRAWING: Figure 1

The efficient and stable pocket processing mechanism comprises a portal frame, the portal frame is installed above a working panel, a first driving device is arranged on the portal frame and extends in the left-right direction, and the first driving device is used for driving a translation frame to translate in the left-right direction; a portal frame is installed above a working panel of a pocket machine rack, a first driving device and a translation frame are installed on the portal frame, a material fixing mechanism and a bag folding mechanism are installed on the translation frame, and the bag folding mechanism is located above the material fixing mechanism. The first driving device can drive the translation frame, the material fixing mechanism and the bag folding mechanism to jointly translate left and right, the translation reliability of the material fixing mechanism and the bag folding mechanism can be greatly improved through the arrangement of the portal frame, and the bag folding mechanism is more stable in structure; and the edge of a machining opening can be folded, and the machining efficiency is higher.

The utility model relates to a folding knife synchronous adjusting mechanism of a pocket patching machine and the pocket patching machine, the folding knife synchronous adjusting mechanism comprises a base plate and a plurality of sets of folding knife assemblies installed on the base plate, each set of folding knife assembly comprises a folding knife with a working position used for acting with pocket-shaped cloth; the second driving mechanism is mounted on the base plate and used for driving the folding knife; and the linkage assembly is in transmission connection with the folding knives in the at least two sets of folding knife assemblies and is used for adjusting the working positions of the corresponding folding knives in a linkage manner. According to the folding knife synchronous adjusting mechanism of the patch pocket machine, the working efficiency and the adjusting precision and stability are further improved.

The utility model relates to an adjustable pocket patching machine female die scaling mechanism and a pocket patching machine, and the adjustable pocket patching machine female die scaling mechanism comprises a base plate with a top side and a bottom side which are opposite to each other; the female die is provided with a female die wall matched with a preset bag shape, the female die wall comprises a plurality of unit walls, and the unit walls are installed on the bottom side of the base plate in a position-adjustable mode; the adjusting part is movably installed on the base plate, and the adjusting part is in transmission connection with the unit wall and drives the unit wall to conduct position adjustment relative to the base plate. According to the adjustable pocket patching machine female die scaling mechanism, the working efficiency of adjusting the female die can be improved, and the adjustable pocket patching machine female die scaling mechanism can quickly adapt to different pocket shapes and sizes.

The utility model relates to an automatic female die scaling mechanism for a pocket patching machine and the pocket patching machine, and the automatic female die scaling mechanism for the pocket patching machine comprises a base plate, a female die set and a female die set, the female die is provided with a female die wall matched with a preset bag shape, the female die wall comprises at least two unit walls, and each unit wall is installed on the bottom side of the base plate in a sliding positioning mode; and the first driving mechanism is in transmission connection with each unit wall and drives each unit wall to change the relative position. According to the female die automatic scaling mechanism for the pocket patching machine, the female die wall of a split structure is adopted, namely, the multiple unit walls with the adjustable relative positions are adopted, the multiple unit walls can be mutually linked to complete adjustment at a time and automatically locked, and automatic scaling adjustment can be conducted according to the size of a pocket.

The utility model relates to an automatic folding knife adjusting mechanism for a pocket patching machine and the pocket patching machine, the automatic folding knife adjusting mechanism comprises a base plate and a plurality of sets of folding knife assemblies installed on the base plate, and each set of folding knife assembly comprises a folding knife with an initial position and a working position after movement; the second driving mechanism is mounted on the base plate and used for driving the folding knife to be switched between the initial position and the working position; the locking mechanism is connected between the second driving mechanism and the folding knife, and the locking mechanism has a locking state for keeping the linkage of the second driving mechanism and the folding knife and a releasing state for releasing the linkage; the folding knife automatic adjusting mechanism further comprises a first driving mechanism, and the first driving mechanism is connected with the folding knife assemblies and used for adjusting the folding knife when the locking mechanism is in the release state. According to the folding knife automatic adjusting mechanism for the patch pocket machine, the working efficiency and the adjusting precision and stability are further improved.

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.

The utility model provides a driving mechanism for button sewing movement of a button sewing clamp in a button sewing machine, and belongs to the technical field of sewing. The technical problem that an existing button sewing clamp is low in stability when a button moves back and forth at a high speed is solved. According to the driving mechanism for the button sewing clamp to move the button in the button sewing machine, the button sewing machine comprises a machine shell, a lower shaft and the button sewing clamp, a button clamp base is arranged at the position, above the lower shaft, of the machine shell, the rear end of the button sewing clamp is connected with the rear end of the button clamp base, the driving mechanism comprises a swing rod, the swing rod is rotationally connected into the machine shell through a rotating shaft, and an avoiding connector is arranged at the front end of the swing rod. The lower shaft penetrates through the avoiding connector, and the upper end part of the avoiding connector is movably connected with the front end of the buckling and clamping seat. The nail catcher has the advantages of being compact in structure and enabling the nail catcher to move more stably.

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 present application provides a cloth feeding mechanism and a sewing machine for a sewing machine, specifically relating to the technical field of sewing machine manufacturing. The cloth feeding mechanism has a cloth feeding drive source and a lifter drive source. The cloth feeding drive source indirectly drives the tooth carrier of the cloth feeding mechanism. While the cloth feeding drive source indirectly drives the tooth carrier, the lifter drive source directly drives the same tooth carrier to generate a swinging motion. The tooth carrier and its cloth feeding teeth, under the combined action of the lifter drive source and the cloth feeding drive source, cause the cloth feeding teeth to perform a cloth feeding action. By using the cloth feeding drive source to indirectly drive the tooth carrier of the cloth feeding mechanism, and while the cloth feeding drive source indirectly drives the tooth carrier, the lifter drive source directly drives the same tooth carrier to generate a swinging motion, it is realized that the tooth carrier and its cloth feeding teeth, under the combined action of the lifter drive source and the cloth feeding drive source, cause the cloth feeding teeth to perform a cloth feeding action. The present application makes full use of the drive source of the sewing machine, effectively improves the utilization efficiency of the power of the sewing machine, greatly reduces the manufacturing cost of the sewing machine, and has high value for use and promotion.

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 properly make a production plan of a sewn product.SOLUTION: A sewing management system includes: a normal operation time calculation unit that calculates normal operation time indicating time required for a normal operation in which an operator sews a sewing target by using a sewing machine; a correction operation time calculation unit that calculates correction operation time indicating time required for a correction operation in which the operator corrects the sewing target after the normal operation by using the sewing machine; and an output unit that outputs the normal operation time and the correction operation time.SELECTED DRAWING: Figure 1

The invention provides a needle feeding switching mechanism and method of a sewing machine, and the needle feeding switching mechanism comprises a needle rod, a machine needle, a tooth frame, a feeding tooth, a tooth lifting mechanism and a feeding mechanism which are connected with the tooth frame, and a cloth puncturing mechanism and a needle swinging mechanism which are connected with the needle rod, the feed lifting driving source, the feeding driving source, the needling driving source and the needle pendulum driving source are four mutually independent driving sources; the needle swing driving source determines the needle feeding distance of the machine needle; within the operation range of the needle pendulum driving source, the needle pendulum driving source is provided with a zero needle feeding distance position where the corresponding needle feeding distance is zero. In the application, the phases of the feed lifting driving source and the feeding driving source relative to the cloth pricking driving source are adjustable, and the needle swing driving source determines the needle feeding distance of the machine needle, so that the needle feeding distance can be zero; the feeding mode of the sewing machine is flexibly switched between common feeding and needle feeding through phase control over the feed lifting driving source, the feeding driving source and the cloth pricking driving source and output control over the needle swing driving source, and the application range of the sewing machine is widened.

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 present invention proposes a sewing machine with stitch length adjustment and zero-position positioning of a swing seat, specifically relating to the technical field of sewing machine manufacturing, comprising a driving source, a connecting rod, and a swing seat, characterized in that it also comprises an adjusting wheel and a slider, wherein the driving source drives the slider on the output shaft to indirectly position the swing seat at zero, and the slider is arranged on a slide groove of the adjusting wheel, the adjusting wheel is connected to the connecting rod, and the connecting rod is hinged to the swing seat. The present application has the characteristics of high accuracy in positioning the zero point of the swing seat, the static positioning wheel is fixed and equipped with an adjusting wheel to make the operation more stable, the gap between the various components is small after positioning, the degree of mechanical wear of the various components is small, and the noise is relatively low, which has the advantages of stable operation and high promotion and use value.

The invention provides a sewing control method of a computer sewing machine, and belongs to the technical field of sewing machines. The problem that an existing computer sewing machine is insufficient in sewing quality is solved. The sewing control method comprises the following steps that A, a thread shifting device with a thread shifting rod is arranged on the side portion of a bottom shuttle; b, the control system judges and records a reverse stitch needle point; c, sewing a first needle; d, the feeding device drives the sewing material to move to a next-needle sewing position, and according to whether the needle point of the current sewing position is a reverse stitch needle point or not, the following actions are executed: if yes, a thread shifting rod is controlled to move and act on a bottom thread between a bottom shuttle and a needle plate, so that one part of the bottom thread crosses an axial lead where a machine needle is located, and the other part of the bottom thread crosses an axial lead where the machine needle is located; then the machine needle brings the upper thread to the position below the needle plate, the thread shifting rod is separated from the bottom thread, and the upper thread and the bottom thread are interwoven to form a stitch; if not, the machine needle moves downwards to bring the upper thread to the position below the needle plate, and the upper thread and the bottom thread are interwoven to form a stitch. The sewing machine has the advantages of high sewing quality and low manufacturing cost.

The utility model relates to the technical field of lockstitch sewing machines, in particular to a combined mechanism for trimming threads and adjusting feed lifting amount of a lockstitch sewing machine and the lockstitch sewing machine. Comprising a thread trimming mechanism, a feed lifting amount adjusting mechanism and a first driving motor, and the first driving motor drives the thread trimming mechanism and the feed lifting amount adjusting mechanism; a rotating area of a motor shaft of the driving motor I can be at least divided into a thread trimming area and a feed lifting amount adjusting area; when the motor shaft rotates in the thread trimming area, the thread trimming mechanism executes a thread trimming action, and the feed lifting amount adjusting mechanism does not execute effective feed rack height adjustment; when the motor shaft rotates in the feed lifting amount adjusting area, the feed lifting amount adjusting mechanism adjusts the effective height of the feed rack, and the thread trimming mechanism does not execute the thread trimming action; the feed lifting amount adjusting mechanism comprises a feed lifting assembly, a feed lifting amount adjusting assembly and a feed lifting amount adjusting assembly, the combined assembly is simultaneously connected with the feed lifting assembly, the driving motor I and the upper shaft; the upper shaft transmits power to the feed lifting assembly through the combined assembly, and the first driving motor adjusts the transmission amplitude between the upper shaft and the feed lifting assembly through the combined assembly.

The invention relates to the technical field of sewing machines, in particular to a control method for preventing needle breakage of a sewing machine, which comprises the following steps of: setting a thin material mode with a thin material forward and backstitch non-switching angle interval and a thick material mode with a thick material forward and backstitch non-switching angle interval; the height from the machine needle corresponding to the starting angle of the thick material forward and backstitch non-switching angle interval to the upper surface of the needle plate is greater than the height from the machine needle corresponding to the starting angle of the thin material forward and backstitch non-switching angle interval to the upper surface of the needle plate; the termination angle of the thick-material forward and backstitch non-switching angle interval and the termination angle of the thin-material forward and backstitch non-switching angle interval correspond to the situation that feeding teeth sink below a needle plate, a cloth thickness threshold value is set, and when the thickness of sewn cloth does not exceed the cloth thickness threshold value, forward and backstitch switching operation is carried out based on a thin-material mode; and when the thickness of the sewn cloth exceeds a cloth thickness threshold value, forward and reverse sewing switching operation is carried out based on the thick material mode. Needle breakage is prevented when thick materials are sewed, multi-stitch one-needle sewing is avoided when thin materials are sewed, and forward and reverse stitch switching response is fast.

The utility model discloses a driving assembly of a material folding device of a pocket opening machine, and belongs to the field of garment processing equipment. A driving assembly of a material folding device of a bag opening machine comprises the material folding device, and the output end of the driving assembly is connected with the input end of the material folding device so as to drive the material folding device to operate. The driving assembly comprises a power device, a plurality of screw rods and a plurality of linkage seats; the output end of the power device is indirectly or directly connected with the corresponding screw rod; the periphery of the lead screw is rotationally sleeved with a corresponding linkage base. The material folding device comprises a plurality of material pressing plates; the bottom of the linkage seat is indirectly or directly connected with the corresponding pressure plate; by means of the arrangement, when the lead screws rotate and operate, the linkage base drives the material pressing plate to transversely move in the axial direction or the radial direction on the horizontal plane so as to conduct material folding operation on cloth.

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 sewing machine automatic counting device based on a WIFI wireless network. The sewing machine automatic counting device comprises a power supply module, a WIFI communication module and a counting detection circuit. The power supply module is connected with the WIFI communication module, the WIFI communication module is connected with the counting detection circuit, and two divider resistors in the counting detection circuit carry out voltage division and reduction processing on high voltage signals generated when the sewing machine works so that the WIFI module can detect the high voltage signals conveniently. The counting detection circuit outputs the state detection signal to the WIFI communication module, and the WIFI communication module counts the working times of the sewing machine by counting the high-low level change times of the received state detection signal. The WIFI communication module uploads the counted number of times to a cloud or a server according to a certain frequency through a wireless network technology, and remote monitoring and management of the sewing machine are achieved.

The roller car comprises a roller car body and an auxiliary feeding mechanism installed on the roller car body, the roller car body comprises a machine needle and a feeding roller, and the feeding roller is arranged on one side of the radial direction of the machine needle and used for conveying fabric to the machine needle; the auxiliary feeding mechanism comprises a feeding assembly, the feeding assembly is arranged on the side, away from the feeding roller, of the machine needle along the motion trail of the fabric, and the feeding assembly can convey the fabric passing through the machine needle outwards. Therefore, the feeding track of the fabric treated by the machine needle can be controlled, and the feeding track can be automatically controlled when the roller car works, so that the roller car can be used as a mother machine and can be transformed into a sleeve stitching machine.

The utility model belongs to the technical field of sewing machines, and particularly relates to a double-stepping overedger which comprises a machine body, and a thread trimming assembly, a presser foot lifting assembly, a feed lifting tooth shaft and a feeding tooth frame are arranged in the machine body. The first stepping motor is arranged on the side face of the machine body, a first motor shaft is arranged in the first stepping motor, and double cams are installed on the periphery of the first motor shaft and used for driving the thread trimming assembly and the presser foot lifting assembly to act; the second stepping motor is arranged on the side face of the machine body, a second motor shaft is arranged in the second stepping motor, a first crank is installed on the periphery of the second motor shaft, and one end of the first crank is connected with a connecting rod. The second stepping motor can control the height of the feeding tooth frame, the rotation angle of the stepping motor is utilized to enable the teeth to operate according to the set height, through double-stepping control, non-pneumatization and non-electromagnet are achieved, production noise can be lowered, and the sewing effect is improved.

The utility model discloses a cuff and neckline feeding mechanism for a sewing machine, and relates to the technical field of sewing machine feeding. A mounting seat is fixedly mounted on the workbench; a sewing machine body is fixedly mounted on the mounting seat; a conduction assembly is arranged on one side of the end of the sewing machine body. The conduction assembly comprises a fixing plate; one side of the fixing plate is fixedly mounted on the mounting seat; a sliding rail is arranged on one side, away from the mounting seat, of the fixing plate; a sliding frame is installed on the sliding rail in a matched mode. A movable roller is movably mounted at one end of the carriage close to the sewing machine body through a rotating shaft; the fixed rotating roller and the fixed plate are movably mounted through a rotating shaft; a product needing to be sewn is arranged on the conduction assembly and the driving assembly in a sleeving mode, it is effectively guaranteed that the sewing position of the product is located in the working area of the sewing machine body, automatic sewing treatment on the sewing position of the product is achieved through the sewing machine body, and in the sewing process, through cooperation between the conduction assembly and the driving assembly, the sewing efficiency is improved. And the automatic feeding effect of sewn products is effectively ensured.

The utility model relates to an automatic integrated sewing device which comprises a machine frame provided with a working table with a smooth face. The mold is used as a processing pattern plate; the grabbing mechanism is detachably connected with the mold; the position driving mechanism comprises a driving motor connected with the top of the grabbing mechanism, a vertical linear module used for driving the driving motor to move up and down, a second rocker arm used for driving the vertical linear module to rotate and swing on the horizontal plane, and a first rocker arm used for driving the second rocker arm to rotate and swing on the horizontal plane. The visual identification module is arranged above the grabbing mechanism and is used for identifying the model of the mold; the sewing equipment is arranged on one side of the rack and used for conducting sewing operation on the processed fabric; and the control module is in communication connection with the grabbing mechanism, the position driving mechanism, the visual identification module and the sewing equipment. Operation can be achieved without professional numerical control personnel, and the technical threshold is low.

The utility model provides a presser foot lifting mechanism of a sewing machine, particularly relates to the technical field of sewing machine manufacturing, and provides the presser foot lifting mechanism of the sewing machine aiming at the problem that the sewing machine is difficult to sew sewing materials with different thicknesses at high quality, which is provided with a driving motor, a presser foot rod and a presser foot, and is characterized by also comprising an eccentric wheel connecting rod and a lever, an eccentric wheel connecting rod is fixed to a driving shaft of the driving motor and hinged to a lever, the other end of the lever is hinged to a guide movable block, the guide movable block is fastened to the middle of a presser foot rod, and a presser foot is connected to the lower end of the presser foot rod. The presser foot lifting mechanism is used for driving the presser foot rod provided with the presser foot to move up and down in the sewing process so that the presser foot can ascend or descend, the sewing requirements of sewing materials with different thicknesses can be met, the technical effect that the sewing material stitch density consistency is achieved on the sewing materials with different thicknesses as far as possible is achieved, and the sewing quality is improved.

A sewing machine external unit includes: a holder holding fabric; a driver being detachable from a bed of a sewing machine and driving the holder along an upper surface of the bed; a pressing member moving in an up-down direction according to movement of a sewing needle in the up-down direction, pressing the fabric while the sewing needle is stuck in the fabric, and rising together with the sewing needle in response to the sewing needle coming out of the fabric and rising; a position detector detecting a position of the pressing member in the up-down direction; a signal output part outputting a signal to the sewing machine; and a controller outputting a needle drive signal for driving the sewing needle from the signal output part to the sewing machine, and controlling driving of the holder and / or the sewing needle based on a detection result of the position detector.