289results about "Sewing-machine control devices" patented technology

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.

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.

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 a sewing machine and a cloth pricking stroke adjusting device thereof. The cloth pricking stroke adjusting device comprises a driving mechanism, and an output shaft of the driving mechanism rotates to drive a presser foot lifting cam and an adjusting crank to rotate to a working position; the working positions comprise at least one adjusting position of the presser foot lifting cam and at least one adjusting position of the adjusting crank; the adjusting position of the presser foot lifting cam corresponds to the upper limit position and the lower limit position of the foot lifting module; the adjusting crank is hinged to the adjusting connecting rod, the adjusting position of the adjusting crank corresponds to the target angle of the adjusting crank, and the driving mechanism drives the adjusting crank to swing to the target angle, so that the position of the fixed end of the adjusting connecting rod changes along with the target angle of the adjusting crank. By adjusting the position target of the fixed end of the connecting rod, the target cloth puncturing stroke is correspondingly adjusted, the cloth puncturing stroke adjusting device is applied to the sewing machine, and the sewing machine with the cloth puncturing stroke adjusting function is obtained.

The utility model discloses a computer back hook machine of quick start -stop, relates to back hook machine field, including stable conveying frame, the inside installation of stable conveying frame's opening place sliding limit mouth, the left and right sides of sliding limit mouth are equipped with the transmission elastic mechanism that carries out the rotation of transmission bite link, transmission elastic mechanism includes rotary drive motor, and rotary drive motor fixed mounting is in the side of stable conveying frame. This computer back hook machine of quick start -stop, when needing to carry out quick conveying start -stop operation to cloth, directly starts rotary drive motor and drives left and right two groups transmission bite link through the connection transmission belt, cloth will be driven along stable conveying frame and be driven stably, and rotary drive motor can make the equipment automatic start -stop through the position of detection anti -run -off bending plate, and the design of such delivery stability improves, and when producing deviation, can carry out the stop operation quickly, make the use intelligent nature and stability of equipment improve.

The utility model provides a cantilever quick hand, including work table surface, be located cantilever on work table surface, cantilever one end is connected in work table surface place, and the other end is suspended and is set on work table surface upside, with the end of cantilever and work table surface between having the space for avoidance, cantilever side rotation is provided with first arm, and first arm end part lift is provided with work rod, first arm is used for driving work rod in the space for avoidance work, the utility model discloses can not occupy the additional equipment area while increasing processing range, and can control work position accurately at the arbitrary position of processing range.

The utility model provides a flat cutter thread trimming mechanism of a sewing machine and belongs to the technical field of sewing machines. The problem that an existing flat cutter thread trimming device is high in maintenance cost is solved. The flat cutter thread trimming mechanism of the sewing machine comprises a fixing frame, a rotating shaft vertically arranged on the fixing frame in a penetrating mode, a fixed cutter horizontally fixed to the fixing frame, a movable cutter connected to the fixing frame in a horizontal swinging mode and a movable handle arranged outside the rotating shaft in a sleeving mode and capable of rotating around the axis of the rotating shaft. The flat cutter thread trimming mechanism of the sewing machine further comprises a driving motor, a long-strip-shaped swing rod and a long-strip-shaped driving rod, an output shaft of the driving motor is vertically arranged, the swing rod and the driving rod are horizontally arranged, one end of the swing rod is fixed to the output shaft, and the other end of the swing rod is hinged to one end of the driving rod. And the other end of the driving rod is hinged with the other end of the movable handle. The flat cutter thread trimming mechanism of the sewing machine has the advantage of low maintenance cost.

The invention provides a lower thread cutting device of a flat chain seam sewing machine. According to the utility model, the problem that the operator is difficult to understand and inconvenient due to the difference that whether the tension applied to the thread by the thread trapper can be released or not by operating the pedal and operating the presser foot lifting rod due to the presence or absence of the lower thread cutting device can be solved. The lower thread cutting device is provided with a lower thread cutting operation mechanism (5) which enables the thread loosening mechanism (4) and the lower thread cutting mechanism (3) to operate, and a presser foot lifting operation mechanism (6) which does not enable the lower thread cutting mechanism (3) to operate and enables the thread loosening mechanism (4) and the presser foot lifting mechanism (2) to operate. Therefore, the force of the thread trapper (11) can be released by operating the pedal plate with a foot regardless of the presence or absence of the off-line cutting device.

This invention relates to the field of pillowcase production line technology, specifically a novel pillowcase production line, comprising a feeding module, an edge-rolling and sewing module, a fabric cutting module, a side-sewing and sewing module, a bottom-sewing and sewing module, and a pocket-turning and material-collecting module arranged sequentially along the material flow direction. The feeding module provides and conveys continuous pillowcase fabric; the edge-rolling and sewing module automatically rolls and sews one edge of the pillowcase fabric. This invention significantly improves production efficiency and capacity: by integrating seven major processes—feeding, edge rolling, cutting, side sewing, bottom sewing, pocket turning, and material collection—into a continuous production line, it achieves fully automated production from roll material to finished product. In particular, designs such as "non-stop fabric connection," "buffer roller module," and "accelerated inter-process transfer" greatly reduce non-productive downtime, significantly accelerating the overall production cycle and fundamentally improving capacity.

To improve visibility or operability in a display input part.SOLUTION: A sewing device includes: a display input part 80 having a display part 81 for displaying an image of an input screen G1, and an input detection part 82 for detecting an input operation with respect to the input screen G1; and a control device 90 for performing display control of the display part 81 according to the input operation. The control device 90 performs display control in which the background of the input screen G1 is dark color as a whole, a sewing pattern image displayed in the input screen G1 has brightness higher than the background, and operation parts B11-B53 for receiving the input operation in the input screen G1 is lighter color than the background.SELECTED DRAWING: Figure 4

The utility model provides an electric control panel of a sewing machine, and belongs to the technical field of sewing equipment. The sewing machine comprises a machine shell, the electric control panel comprises a plate body, a mounting groove is formed in the machine shell, a connecting plate is mounted in the mounting groove, a plurality of movable reset columns are arranged on the connecting plate, a plurality of second positioning holes are formed in the plate body, the reset columns are inserted into the corresponding second positioning holes respectively, and mechanical keys are arranged on the second positioning holes. The electronic control panel adopts mechanical keys, other keys are not affected when a single key is damaged, only corresponding keys need to be replaced independently, maintenance is convenient, and cost is low.

The present application belongs to the technical field of sewing machine, and particularly relates to a sewing machine and a lifting tooth mechanism, which comprises a first lifting tooth crank, a first connecting rod, one end of which is hinged to the first lifting tooth crank, and the other end of which is a moving end, the moving end moving along a set moving track, an endpoint one arranged at one end of the moving track, a transformation point arranged at the middle of the moving track, and an endpoint two arranged at the other end of the moving track, the first lifting tooth crank swinging to a limit position one in a first direction when the moving end moves to the endpoint one, the first lifting tooth crank swinging to a limit position two in a second direction when the moving end moves to the transformation point, and the first lifting tooth crank swinging to a limit position three in the first direction when the moving end moves to the endpoint two, the motor shaft rotating to form a continuous change of the teeth from high to low or from low to high in several sections, so that the lifting tooth mechanism and other mechanisms can share one driving source, thereby realizing the simplification of the transmission system.

The utility model relates to a kind of sewing machine cloth feeding transmission structure, including the drive shaft that is rotated by motor drive and is installed in sewing machine, drive shaft left side output end is connected with the intermittent transmission mechanism that is relatively arranged on drive shaft and is driven by drive shaft and is connected out of sewing machine, intermittent transmission mechanism is drivingly connected with output shaft, drive shaft is driven output shaft to carry out intermittent rotation by intermittent transmission mechanism, output shaft front end is spaced apart and is provided with the cloth feeding shaft that is rotated by the transmission structure being set outside sewing machine, cloth feeding shaft is installed with the cloth feeding wheel that is used to forwardly convey cloth and contact with cloth, intermittent transmission mechanism and transmission structure are relatively arranged in the outside of sewing machine, to avoid intermittent transmission mechanism occupies larger installation space in sewing machine and facilitate the installation and maintenance of intermittent transmission mechanism, at the same time, intermittent transmission mechanism is relatively arranged on drive shaft, so that the transmission of intermittent transmission mechanism is stable.

The invention relates to the technical field of driving machine heads, and discloses a double-cam single-driving machine head which comprises a main shaft, the main shaft is rotationally connected to the inner side of a shell, a first rotating ring is fixedly connected to the outer wall of the main shaft, a sleeve shaft is fixedly connected to the rear end of the main shaft, and a second rotating ring is rotationally connected to the outer wall of the sleeve shaft; a pause ring is fixedly connected to the front end of the sleeve shaft, a ring groove is formed in the front side of the pause ring, a first rotating rod is rotationally connected to the inner side of the shell, a first connecting rod is fixedly connected to the outer wall of the first rotating rod, and a cylinder is rotationally connected to the other end of the first connecting rod. The main shaft rotates to drive the first rotating ring and the sleeve shaft to rotate synchronously, the second rotating ring drives the pause ring to rotate accordingly, the cylinder slides in the ring groove, and when the ring groove rotates to the top, the cylinder is pushed to drive the first connecting rod to swing upwards around the first rotating rod, so that the pause ring is decelerated, stable deceleration of equipment when the equipment runs to a preset position is achieved, and high-speed collision of components is avoided; and mechanical loss and operation noise are reduced.

The utility model relates to the technical field of buttonholing machine, especially is buttonholing machine for clothing processing, including buttonholing machine main part, the side of buttonholing machine main part is established with the slide groove, the inside of slide groove is rotated and is connected with the lead screw through bearing, the outer surface screw thread connection of lead screw has the lifting plate, the utility model has the advantages that: the rotating stand on U -shaped support connects transparent plate, when pulling plate pulls toothed plate and overcomes the elastic force of spring and moves up, toothed plate and arc gear cover disengage meshing, and rotating stand can rotate around connecting rod, and transparent plate is rotated to needle head work area front and forms the protective barrier, after loosening pulling plate, spring pushes toothed plate and resets, and with arc gear cover meshing fixes the position of rotating stand and transparent plate. In this way, even if needle head breaks under the working condition such as puncturing thick material, transparent plate can effectively block the high-speed burst of broken needle head, avoid its to operating personnel cause harm, significantly improved the security in the use of buttonholing machine.

Sewing machine (10) with a vertical shuttle (20) and a center shuttle presser (22) arranged on a front side of the vertical shuttle (20), the sewing machine (10) comprising: a presser frame (30) which is movably held between a press position in which the center shuttle presser (22) is pressed and a retract position which is separate from the press position; an optical upper thread detector (60) which is provided on the presser frame (30) and is configured to detect the passage of an upper thread using detection light which passes through passage areas formed in the center shuttle presser (22) and crosses a front side of a bobbin case (24) of the vertical shuttle (20);and a stitch exit detection processor (90) which is configured to determine, based on an amount of light received from the detection light by the upper thread detector (60), whether the passage of the upper thread is present.

The utility model relates to the technical field of sewing, in particular to a sewing triplet machine convenient to feed, which comprises a transmission mechanism, the transmission mechanism is sleeved on the outer wall of the bottom end of a lifting mechanism, the bottom end of the lifting mechanism is rotatably connected to the bottom wall of a bottom box, and a supporting seat is arranged on one side of the top of the bottom box. A plurality of sewing machine bodies are arranged on the top of the supporting seat, fixing seats are arranged on the outer walls of the left side and the right side of the bottom box, a feeding mechanism is arranged on the top of the fixing seat on one side, a collecting mechanism is arranged on the top of the fixing seat on the other side, and a sewing table is in threaded connection with the outer wall of a lifting mechanism. According to the improved sewing triplet machine, the lifting mechanism can provide accurate lifting control for the sewing table, so that the sewing table is lifted to be attached to cloth, stable support is provided for the cloth, accuracy and stability of sewing operation are ensured, automatic feeding of the cloth is achieved through the feeding mechanism, and the sewing efficiency is improved. And the material receiving mechanism can automatically wind the sewn cloth, so that the production efficiency is improved.

The invention discloses a real-time detection device for a batting fiber product casing spreading machine, which is characterized in that a rotating motor drives a screw rod to rotate, the screw rod drives a sliding block to slide along the length direction of a light sensing plate, the sliding block drives an illumination instrument to illuminate cloth laid on the light sensing plate, and the light sensing plate collects image data of the cloth; whether flaws exist on the surface of the cloth or not is judged according to the image data, so that the detection efficiency and the accuracy of a detection result are improved. The device is characterized in that the device is composed of a spreading machine, supporting columns, a photosensitive plate, rotating motors, lead screws, sliding blocks, telescopic rods, a shading plate, supporting rods and an illumination instrument, one ends of the four supporting columns are correspondingly arranged at the four corners of the bottom face of the photosensitive plate respectively, one end of the photosensitive plate is close to the spreading machine, and the rotating motors are correspondingly arranged on the two sides of the spreading machine respectively; the rotating motor is close to one end of the photosensitive plate, and the bottom surfaces of the two shading plates are correspondingly and vertically arranged on the two sides of the top surface of the photosensitive plate respectively.

In a sewing machine that can be operated by voice commands, the goal is to achieve both safety and ease of operation through voice control. [Solution] The sewing machine 1, which forms a stitch in fabric by moving a needle 5 up and down, has a microphone 16 that collects sound emitted by the user, and a control unit 20 configured to process the sound collected by the microphone 16 to recognize voice commands for operating the sewing machine 1 emitted by the user and to execute the recognized voice commands. The control unit 20 has a wake word mode and a two-factor authentication mode that execute voice commands on the condition that a predetermined sound is emitted by the user, as well as a direct command mode that executes voice commands without requiring such conditions, and is configured to switch the voice command mode at least according to the operating status of the sewing machine 1.

The utility model belongs to the technical field of sewing machines, and particularly relates to a straight knife type thread trimming mechanism and a template machine. The straight knife type thread trimming mechanism comprises a machine shell, a first movable knife mechanism and a second movable knife mechanism; the first movable cutter is rotatably arranged on the machine shell by taking the rotating shuttle shaft as the center; the first trimming motor is fixed to the machine shell and used for driving the first movable cutter. The first movable cutter is used for driving the sewing thread to the second movable cutter mechanism; the second movable cutter mechanism is used for being matched with the first movable cutter mechanism to cut off the sewing thread and comprises a second thread cutting motor, a second movable cutter and a guide assembly; the second trimming motor drives the guide assembly to move in the set direction through the crank assembly. The second moving cutter is installed on the guide assembly and has a first position and a second position in the set direction. The first position is closer to the first moving cutter than the second position; when in the first position, the cutting edge of the second movable cutter is matched with the cutting edge of the first movable cutter to execute thread trimming action; at the second position, the cutting edge is separated from the first movable cutter, so that the thread trimming action is efficient and reliable, and maintenance is convenient.

The overlock device comprises a box body, an overlock machine body and an ironing machine, a rectangular plate is connected to the inner wall of the rear side of the box body through bolts, and first guide rails are connected to the positions, close to the bottom, of the front wall of the rectangular plate through bolts in the left-right direction; the two first guide rails are slidably connected with U-shaped blocks correspondingly, the two U-shaped blocks are connected with the same attaching plate through bolts, the front side of the attaching plate is connected with a second guide rail through bolts, the right side of the second guide rail is slidably connected with a U-shaped plate, and the left side of the U-shaped plate is connected with a mounting plate through bolts. According to the technical scheme, the eccentric cam, the cam groove, the rotating wheel, the U-shaped plate and other parts are matched with one another, so that the overlock sewing machine body can be driven to move conveniently and quickly, and can move up and down synchronously in the moving process, and therefore, effective and uniform overlock sewing can be performed, and the overlock sewing efficiency of the overlock sewing machine is improved.

The utility model provides a computer sewing machine, and belongs to the technical field of sewing machines. The problem that an existing sewing machine is not high in sewing quality is solved. The computer sewing machine comprises a base, a needle plate with a needle falling hole and a rotating shuttle located below the needle plate, and further comprises a guide seat arranged in the base, a transmission shaft located below the rotating shuttle and a thread shifting rod which is in a C-shaped strip shape and is arranged around the periphery of the rotating shuttle. The transmission shaft is horizontally arranged in the front-back direction of the sewing machine and connected to the guide seat in a sliding mode, the lower end of the thread shifting rod is connected with the transmission shaft, and the transmission shaft can do reciprocating motion in the axial direction and do circumferential reciprocating rotation at the same time, so that the upper end of the thread shifting rod does circumferential circulating motion and can be located between the needle falling hole and the rotating shuttle. According to the design of the computer sewing machine, the control difficulty is reduced, the sewing error is obviously reduced, and the sewing quality is further improved.

The utility model relates to 3D computer pattern machine technical field, concretely relates to a Y theta direction drive mechanism of cylinder pattern machine, adopt installation chassis, Y direction drive component, Y direction transmission component, mounting seat, cylinder, the theta direction drive component connected in the bottom of mounting seat, and with the output end connection of theta direction drive component theta direction transmission component, the output end fixed cover of theta direction transmission component is located in the outer periphery of cylinder. This Y theta direction drive mechanism is fixed and installed on the cylinder pattern machine through installation chassis and uses, when the cylinder needs to move back and forth, Y direction drive component drives Y direction transmission component and drives mounting seat to move back and forth along Y direction, thereby drive cylinder moves back and forth along Y direction, when the cylinder needs to rotate, theta direction drive component drives theta direction transmission component and drives cylinder to rotate along theta direction, avoids multiple clamping, manual adjustment cloth angle, is favorable to adapt the 3D three -dimensional sewing of cylinder pattern machine.

The application discloses a swing structure of a sewing machine, which comprises an eccentric mechanism, a main shaft, a crank rocker mechanism, a transmission mechanism and a pressure rod. The main shaft is pivotally connected to a rack, and the main shaft is connected with the eccentric mechanism for driving the main shaft to swing. The crank rocker mechanism comprises a crank and a rocker for driving the crank to move. The crank moves and drives the pressure rod to move up and down through the transmission mechanism. The pressure rod is connected with a second mechanism. The main shaft is provided with a first pressing block and a second pressing block for abutting against the rocker. During the process that the main shaft swings by the eccentric mechanism, when the main shaft swings to abut against the rocker by the first pressing block, the rocker does not move; when the main shaft swings to abut against the rocker by the second pressing block, the second pressing block presses down the rocker, the rocker drives the pressure rod to move up through the crank and the transmission mechanism, and the pressure rod drives the second mechanism to move up, so that the second mechanism moves up and down intermittently. The second mechanism is driven to move up and down by the eccentric structure, and the structure is simple and easy to realize.

A sewing machine that suppresses sewing defects is provided. The sewing machine includes: a sewing needle, held by a needle bar and moving back and forth while holding an upper thread; a shuttle, configured to hold a bobbin around which a lower thread is wound and which is housed in a bobbin case, and cooperating with the sewing needle to form a seam; a presser foot member, configured to press a to-be-sewn article at a sewing position directly below the sewing needle; a feeding mechanism, feeding the to-be-sewn article from the sewing position to a first direction; a needle drive portion, provided separately from a belt drive portion to synchronously move the sewing needle and the presser foot component in the first direction; and a control portion, which controls so that the needle drive portion and the belt drive portion operate independently.

The application relates to a sewing machine rotating speed control method, a sewing machine and a storage medium, wherein the method is characterized in that a proportion of a time parameter of the sewing machine running at a first rotating speed in total running time parameters is obtained during running, the first rotating speed is not lower than a first threshold value, and the time parameter comprises running time length or running stage number; and in the case that the proportion is not lower than a second threshold value, the upper limit of the rotating speed of the sewing machine is increased, so that the problem that the sewing efficiency of the sewing machine is low in the case that the highest rotating speed of the sewing machine cannot match the skill proficiency of a user in the prior art is solved.

The utility model belongs to the technical field of button sewing machines, and relates to a structure capable of trimming a thread first and then lifting a presser foot for a button sewing machine, which comprises a rack, a thread trimming device and a presser foot lifting device, a driving motor is arranged on the rack, a driving wheel is fixed on a rotating shaft of the driving motor, and the driving wheel is connected with the thread trimming device and the presser foot lifting device. The thread trimming device and the presser foot lifting device are movably connected with the driving wheel through the starting plate, the driving wheel rotates to sequentially drive the thread trimming device and the presser foot lifting device, a thread trimming groove and a presser foot lifting groove are formed in the starting plate and communicate with each other, and the thread trimming device and the presser foot lifting device are arranged on the starting plate. And the driving wheel is provided with a rolling shaft which is matched with the thread trimming groove and the presser foot lifting groove for use. The utility model aims to provide the structure which is used for the button sewing machine, can solve the problem of complex structure, and is short in thread end after thread trimming.

The invention relates to a linkage structure for folding knife adjustment and thickness adaptive adjustment and a pocket patching machine, and the linkage structure for folding knife adjustment and thickness adaptive adjustment comprises a supporting assembly which comprises a bottom plate; the synchronizing mechanism is mounted on the bottom plate; the number of the moving seats is two, and each moving seat is in transmission fit with the synchronizing mechanism and synchronously and reversely moves above the bottom plate; the number of the bag opening folding knife assemblies is two, and each bag opening folding knife assembly is installed on the corresponding movable base. The limiting piece is located below the bottom plate in a liftable mode and used for abutting against the bag-shaped cloth; and the clutch transmission mechanism is in transmission connection between the synchronizing mechanism and the limiting piece. According to the linkage structure, the operation efficiency can be improved, adjustment of the bag opening folding knife and the limiting piece is achieved through the same power device, and the linkage structure is better suitable for changes of the bag shape size and the cloth thickness.

The utility model relates to the technical field of sewing machines, in particular to a sewing machine. Comprising a bottom plate, a support, an electric control box, a cantilever type touch screen, a sewing machine main machine, an umbrella-shaped opening assembly, an adjusting assembly and a steel wire positioning assembly, the support is fixedly arranged above the bottom plate, and the sewing machine main machine is fixedly arranged above the support; the umbrella-shaped opening assembly comprises a connecting plate, a plurality of supporting plates, a plurality of connecting rods, a plurality of sets of guiding units, a first servo motor, a first ball screw and two first ball nuts, the connecting plate is connected with the adjusting assembly, and the first servo motor is fixedly connected with the connecting plate and located on the outer side wall of the connecting plate; the two first ball nuts are both in threaded fit with the first ball screw, the multiple supporting plates are circumferentially and evenly distributed outside the first ball screw, the two ends of each connecting rod are rotationally connected with the corresponding first ball nut and the corresponding supporting plate respectively, the work labor difficulty of workers can be greatly lowered, and efficiency is improved.