1017results about How to "No slippage" patented technology

A method and apparatus for applying tabs to a traveling web of material at a transfer position when the tabs are provided to the transfer position in a path that is skew to the web travel path. A tab supply assembly carries the tabs in a tab path that is either perpendicularly skew or obliquely skew to the travel path of the web. The web is generally spaced from the tab supply assembly. A plurality of bump transfer surfaces is adapted to urge the web towards the tab supply assembly, thereby contacting a tab.

The invention discloses an overloaded manipulator of a ten-shaft double-gantry. The overloaded manipulator comprises a rack, a first gantry and a second gantry, wherein the rack consists of supporting legs, supports, racks and limit components, wherein first, second, third and fourth supports are connected end to end to form a four-sided frame, and the supporting legs are connected with the four-sided frame in a supporting way; a first rack and first and second mechanical limit devices in an X-axis direction are arranged on the first support, and a second rack and third and fourth mechanical limit devices in the X-axis direction are arranged on the third support; the third and fourth mechanical limit devices are positioned at the two ends of the second rack, and the first and second gantries are respectively arranged on the first and third supports; the first gantry is parallel to the second gantry, and the first gantry moves in X, Y and Z-axis directions to complete the moving of overloaded plates; and the second gantry moves in X, Y and Z-axis directions to complete the moving of small plates. The overloaded manipulator provided by the invention has the advantages of smooth running, low noise, high reliability and long service life, and provides a strong guarantee for the performance of the entire overloaded manipulator.

A method for repairing and reinforcing the defect on the welded seam of pipeline by use of composite carbon fiber material features several layers of wet carbon fiber sheet are tightly wound around and adhered onto said weld seam in various directions. It is possible to use the repairing resin and perform anticorrosion treatment on the external surface of carbon fiber layer.

The invention discloses a catheter and guide wire control device for an interventional operation and a control method of the catheter and guide wire control device, belonging to the technical field of minimally invasive vascular interventional operations. The device comprises a clamping mechanism, a sleeve driving assembly and a brake braking assembly, wherein the clamping mechanism comprises a sleeve, a braking part and a clamping part, after the clamping part with a clamping end is mounted in the braking part, the braking part is in threaded connection with the sleeve, a notch is formed in one end, with the clamping end, of the clamping part, and the clamping end is in conical fit with the sleeve; the sleeve driving assembly is used for driving the sleeve to rotate; the brake braking assembly is used for clamping or loosening the braking part. With the method, a catheter or a guide wire can be clamped, pushed and twisted, and force measurement also can be realized; the efficient, accurate and nondestructive clamping and loosening for the guide wire and the catheter can be realized, and the catheter and the guide wire can be cooperatively operated.

The invention discloses a robot with wheel legs, which comprises a frame. The frame is provided with four legs which have the same structures and have wheel and foot dual-purpose functions; each leg comprises a thigh and a shank rotating around the radial direction of the thigh; the tail ends of the shanks are provided with wheels; the shanks are connected with shank driving devices for driving the shanks to swing forwards and backwards; direct-current motors for driving the wheels to rotate are fixed on the wheels; the direct-current motors are connected with wheel driving devices for driving the direct-current motors to rotate around rotating shafts by the rotating shafts fixed and extending along the radial directions of the shanks; and further, driving shafts of the motors are always perpendicular to the rotating shafts. The robot drives the thighs to swing up and down by means of thigh steering engines and drives the shanks to swing forwards and backwards by means of shank steering engines so as to achieve the leg-type walking of the robot together; even being on a smooth road surface, the robot with the wheel legs cannot slip; and furthermore, the robot is simple and convenient to operate, and has stable movement actions.

The invention discloses anionic emulsified modified asphalt and a preparation method thereof and anionic high-adhesiveness waterborne asphalt waterproof coating. The anionic emulsified modified asphalt is prepared from, by mass, 50-70 parts of matrix asphalt, 1-20 parts of a polymer modifier, 0.5-2 parts of nano carbon fibers, 2-5 parts of a surface modifier, 1-2 parts of an anionic surfactant, 0.1-0.8 part of a pH regulator and 20-40 parts of water. A film formed by the waterproof coating has excellent creep performance and extending performance and is capable of well sealing cracks of a baselayer to effectively resist cracking caused by base layer settlement, deformation and the like, water channeling is prevented, and reliability of an upper waterproof roll is improved.

The invention discloses an inverted arch beam string structure roof of a large-span steel structure. The inverted arch beam string structure roof comprises a set of unit beams distributed in parallel, and purlins vertically distributed between the adjacent unit beams. Each unit beam comprises a beam spring structure and an inhaul cable located on the lower portion of the beam spring structure, wherein a plurality of supporting rods are arranged between the beam spring structure and the inhaul cable. The upper ends of the supporting rods are fixedly connected with the beam spring structures through pin shafts, and the lower ends of the supporting rods are fixedly connected with the inhaul cables through steel casting rigging. Roof crossed supports are arranged between the beam spring structures of the roof. The beam string structure roof is reasonable in structural design, and the inhaul cables are fixed through the steel casting rigging so that the slide phenomena can be prevented; meanwhile, the invention further provides an installation method, and the stability of the whole structure is ensured through the inclined inhaul cables and the crossed supports of the roof; the segmented installation method is reasonable and effective, and it is ensured that the whole structure is smoothly constructed.

The invention relates to a full-automatic smart seam-beautifying machine, and belongs to the technical field of building mechanical equipment. The full-automatic smart seam-beautifying machine comprises a rectilinear track, a translation frame, a seam-wall polishing system, a seam dust-removing system and an agent-injecting system, wherein the seam-wall polishing system is used for polishing the side wall of a seam, the seam dust-removing system is used for removing residue in the seam, and the agent-injecting system is used for injecting tile seam-beautifying agent in the seam. The translation frame is slidably installed on the rectilinear track, the polishing system, the seam dust-removing system and the agent-injecting system are all installed on the translation frame, a track positioning system and a stopping system are further included, and used for positioning the rectilinear track and driving the translation frame to stop moving correspondingly. According to the full-automatic smart seam-beautifying machine, seam-buckling, polishing, dust-removing and agent-injecting can be automatically conducted to the tile seams in a straight line by adopting the structure, the working efficiency is high, and the intelligent degree is high; and the seam-beautifying effect is stable and even, and the practicability is high.

The invention belongs to the technical field of sewing machines, and particularly relates to a sewing machine based on an automatic template split synchronizing wheel apparatus. The sewing machine comprises a sewing machine body, the sewing machine body is provided with a drag wheel lifting and pressing mechanism and a lifting and pressing foot mechanism. A housing rear cover plate of the sewing machine body is provided with a lifting and pressing drag wheel electromagnet, a lifting and pressing foot electromagnet is disposed in the housing, and the lifting and pressing drag wheel electromagnet and the lifting and pressing foot electromagnet are used for respectively controlling the drag wheel lifting and pressing mechanism and the lifting and pressing foot mechanism to act. At the same time, a knee-operated lifting push rod is used for individually controlling the drag wheel lifting and pressing mechanism to act, so that the lifting height of a drag wheel can be adjusted at will, a cloth-dragging wheel can be lifted from a presser when a corner is sewed, and the presser can always pressed the cloth, the cloth can be normally sewed, the sewing performance can be raised, and the sewing effect can be ensured.

The invention discloses a self-adaptive type flexible gripper. The self-adaptive type flexible gripper comprises a slide block rail bracket, an end cover, a spiral rail disc, slide blocks, a motor andflexible single fingers, wherein the end cover is fixedly arranged on the slide block rail bracket; the spiral rail disc is arranged in the slide block rail bracket; the slide blocks are arranged onthe slide block rail bracket; the motor is fixedly arranged on the end cover and is used for driving the spiral rail disc to rotate; each flexible single finger is arranged under the corresponding slide block; an eddy-shaped rail is arranged on the spiral rail disc; a plurality of slide rails are distributed at the bottom end of the slide block rail bracket along the radial direction; the top partof each slide block is matched with the eddy-shaped rail; when the spiral rail disc is driven to rotate by the motor, each slide block drives the corresponding flexible single finger to move along the slide rail. The self-adaptive type flexible gripper has the advantage that the gripping position of each flexible single finger can be changed; the structure is simple, and the installation, detachment and maintenance are easy.

The invention relates to a mechanical type continuously variable transmission device. In the tooth meshing transmission non-stage transmission, two increasing-decreasing gears with gear diameters which are variable as required are used as speed ratio changers, when the gear diameter of one increasing-decreasing gear increases, the gear diameter of the other increasing-decreasing gear decreases the same length correspondingly at the same time, and the two gears are driven by the meshing of a toothed chain. The non-stage transmission overcomes the defects of the friction type continuously variable transmission (CVT) such as small drive moment, chain and wheel slippage, small starting moment, high gear shift power consumption, and really realizes the stepless speed change of tooth meshing transmission. The tooth meshing transmission non-stage transmission has the advantages of big drive torsional moment, small volume, and simple structure, and can be applied to various large and small-sized machines in large and small-sized vehicles or fixed occasions.

The invention provides an amblyopia therapeutic instrument, comprising two parts: an optical mechanical structure system and a control circuit system; the two parts are organically combined with each other so as to form a therapeutic instrument with amblyopia disease treatment function; the control circuit system of the amblyopia therapeutic instrument comprises a keyboard, a keyboard detection circuit, a singlechip system, a speech prompting circuit, a grid, an optical brush, a coiling mechanism, a light source and a light source plate control circuit; the keyboard is used for inputting instructions which are detected by the keyboard detection circuit and transmitted to the singlechip system to be processed; subsequently, the singlechip system is taken as a micro-controller so as to emit control instructions to all control circuits and drive the execution mechanism to work; the optical mechanical structure system of the amblyopia therapeutic instrument of the invention consists of an upper machine cover, a lower case, a guideway component, a pupil adjusting mechanism, an optical brush rotation mechanism, a coiling mechanism and a light source rotation mechanism; the amblyopia therapeutic instrument has the advantages and effects that the treatment methods normally adopted by existing amblyopia therapeutic instruments in the market are integrated into a whole, the structure is optimized, the system performance is more excellent, the operation is more convenient and the man-machine interface is more friendly.

The invention discloses a full-automatic tensioning control method used for a rubber belt machine. The full-automatic tensioning control method includes the steps of in the starting or stopping or running process of the rubber belt machine, calculating the minimum tension F<min> required by the rubber belt machine, and determining a standard tension range according to the F<min>; detecting the belt tension F' of the rubber belt machine; and comparing the detected belt tension F' with the standard tension range, and if the F' is out of the standard tension range, tensioning or loosening a belt of the rubber belt machine till the detected belt tension F' is within the standard tension range. By means of the full-automatic tensioning control method, the tension of the belt can be adjusted in real time in the starting or stopping or running process of the rubber belt machine.

The invention relates to the technical field of integrated circuit manufacturing, and discloses a film removal arranging device of an integrated circuit. The film removal arranging device comprises aframe, two symmetrically arranged carrier plate feeding devices, two symmetrically arranged carrier plate conveying line devices, two symmetrically arranged film removing devices, a carrying manipulator, a visual detection device, a tray feeding device and a tray conveying line device, wherein the carrier plate feeding devices, the carrier plate conveying line devices, the film removing devices, the carrying manipulator, the visual detection device, the tray feeding device and the tray conveying line device are arranged on the frame; the film removing devices are positioned below the carrier plate feeding devices; the carrier plate conveying line devices are connected with the carrier plate feeding devices; the tray feeding device is positioned between the two carrier plate feeding devices; the tray conveying line device is positioned between the two carrier plate conveying line devices and is connected with the tray feeding device; and the carrying manipulator and the visual detectiondevice are arranged on the frame and are positioned above the carrier plate conveying line devices and the tray conveying line device. The film removal arranging device has the advantages of being efficient and accurate in glue removing, automatic in feeding and discharging, high in processing efficiency and capable of collecting and arranging the integrated circuit.

The invention provides a cutting positioning machine which includes a frame body, a rotary positioning mechanism rotatablely arranged on the frame body, and a transmission mechanism driving the rotary positioning mechanism to rotatablely position; the rotary positioning mechanism includes a rotary disc with a chamber, a chain fixedly circled on the external circumference of the rotary disc, and a clamp positioning mechanism arranged at the chamber close to the rotary disc for clamping the pipes; the transmission mechanism includes at least one transmission chain wheel engaged with the chain; as the diameter of the rotary disc of the rotary positioning mechanism on the positioning machine is not restricted by the process, the large rotary disc can be added and meanwhile be matched with the clamp positioning mechanism, tightly clamping the pipes to be cut with different types, in particular to the large types; furthermore, the chain wheel is adopted for transmission, which ensures the stability of the rotation of the rotary disc, thus no skidding or axial movement occurring in the cutting process, and sequentially implementing the synchronous linkage between the cutting equipment and the positioning machine.

The invention discloses a quick connector. The quick connector comprises a fixed joint and a movable joint which is matched with the fixed joint in an insertion connection manner; a shutoff valve device is arranged in an insertion connection passage; the sidewall of the movable joint is provided with a step; the sidewall of the fixed joint is provided with a mounting hole which extends along the radial direction, and the tail end of the mounting hole sinks into the internal wall of the insertion connection passage; a button which slides along the extending direction of the mounting hole in a limiting manner is assembled in the mounting hole; a first elastic member which applies an acting force opposite to the bottom face of the mounting hole to the button is arranged between the button and the fixed joint; and the button is provided with a button passage which is used for passing through the insertion end of the movable joint, and a stopping block which is matched with the step of the movable joint in a stopping manner is arranged on the internal wall of the button passage. Due to the structure, the quick connector has the advantages that the quick connector can be automatically locked by directly inserting the movable joint into the fixed joint during locking and can be automatically unlocked by only pressing down the button during unlocking, the phenomenon of skidding can not occur, the operation is convenient, the locking and unlocking of the quick connector can be easily realized, and meanwhile, the sealing effect of the whole quick connector can also be guaranteed.

The invention discloses a measuring instrument and a measuring method for the verticality and the azimuth of a pile hole. The measuring instrument comprises a measuring rod, a hinge, a support rod, asliding base, two first support parts, a second support part, a water level gauge, a compass, a first laser range finder, a second range finder, and a scale. Each support part comprises a support cylinder, a support telescopic rod, a first fixing knob, and a fixing rod. The middle part of the support rod is connected to the measuring rod through the hinge. The sliding base is slidably connected tothe second measuring rod. Two first support parts are arranged at the two ends of the support rod. The second support part is arranged at the bottom of the sliding base. And the water level gauge andthe compass are arranged at the measuring rod. According to the measuring instrument and the measuring method for the verticality and the azimuth of the pile hole, the measuring instrument realizes the fast and accurate measurement of the verticality and the azimuth of the pile hole, by arranging the measuring rod, the hinge, the support rod, the sliding base, the two first support parts, the second support part, the water level gauge, the compass, the first laser range finder, the second laser range finder, and the scale.

A method and apparatus for applying tabs to a traveling web of material at a transfer position when the tabs are provided to the transfer position in a path that is skew to the web travel path. A tab supply assembly carries the tabs in a tab path that is either perpendicularly skew or obliquely skew to the travel path of the web. The web is generally spaced from the tab supply assembly. A plurality of bump transfer surfaces is adapted to urge the web towards the tab supply assembly, thereby contacting a tab.

The invention discloses an asphalt concrete steel bridge pavement structure comprising a steel bridge (7) derusted by sandblast, an anticorrosive coating (6), a binding layer (5), high-viscosity asphalt embedded compact granular composition concrete bottom layer (3), an oil sticking layer (2) and a high-viscosity asphalt embedded and compact granular composition concrete top layer (1) which are arranged from bottom to top; and furthermore, the invention also provides a pavement method of the asphalt concrete steel bridge pavement structure. According to the asphalt concrete steel bridge pavement structure, the high-viscosity asphalt embedded compact granular composition concrete layers are used as main pavement layers, so that concrete has favorable interlayer binding force and deformation following performance, the generation of cracks can be restrained, so that the whole steel bridge pavement structure has the advantages of favorable track resistance and water seepage resistance.

The invention discloses a rocker-type continuously variable transmission, which relates to a mechanical continuously variable transmission for a vehicle. The rocker-type continuously variable transmission is structurally characterized in that sliders I, slide ways I, rockers, sliders II, slide ways II, connecting rods, racks, straight gears and one-way bearings are symmetrically and sequentially mounted on two sides of a cylindrical cam, the sliders I are mounted on the corresponding slide ways I, a roller on one side of each slider I is mounted in a slide way of the cylindrical cam, a roller on the other side of each slider I is embedded into a slide groove of one rocker, the sliders II are mounted on the corresponding slide ways II, a roller on one side of each slider II is embedded into a slide groove of the other rocker, the other side of each slider II is movably connected with the bottom of each connecting rod, the connecting rods are connected with the corresponding racks through rack supporting grooves, the racks are engaged with the straight gears, the one-way bearings are mounted in the straight gears, a gear shaft is mounted between the two one-way bearings, a bevel gear I is mounted in the middle of the gear shaft and engaged with a bevel gear II, a power output shaft is mounted on the bevel gear II, the front ends of the two opposite rockers are connected with each other by a rocker shaft, and a power input shaft is mounted at the bottom of the cylindrical cam.

A carrying system for safely and efficiently transporting a carried object by increasing a grip force (contact pressure) against the rail of drive wheels in a rail inclined area, comprising a main rail, a vehicle having the drive wheels rolling on the main rail and a drive wheel drive means, a connection means having one end connected to the vehicle and the other end connected to the carried object, an auxiliary rail installed on the lower surface of the main rail in the main rail inclined area, auxiliary wheels held by the connection means so as to roll on the auxiliary rail without coming into contact with the main rail, and an elastic force loading means for providing an elastic force to the auxiliary rings in a direction for pressing the auxiliary wheels against the auxiliary rail.

The invention relates to a power-assisted transferring trolley capable of climbing stairs. The power-assisted transferring trolley capable of climbing stairs comprises a bearing device used for bearing goods, a stair climbing device capable of achieving stair climbing through track movement, a flat ground and stair converting device used for adjusting the working angle between the bearing device and the stair climbing device, a control device used for controlling the working states of the stair climbing devices and the flat ground and stair converting device, and a power source. The bearing device and the stair climbing device are connected through the flat ground and stair converting device. The flat ground and stair converting device comprises a telescopic push rod, a push rod cylinder and a push rod driving motor. The push rod driving motor provides power for the operation of the push rod cylinder. The operating state of the push rod cylinder determines the telescopic length of the push rod. The power-assisted transferring trolley capable of climbing stairs has a flat road traveling function and a stair climbing function, and the movement speed and direction of the trolley can be adjusted; and in addition, the power-assisted transferring trolley is simple in structure and convenient to operate, the labor intensity of operators is greatly relieved, and the working efficiency and safety are improved.

The invention relates to a machine-made sand light-expansion high early strength grouting material and a preparation method thereof. The grouting material comprises the following ingredients: 40-55 wt% of machine-made sand, 40-55 wt% of ordinary portland cement, 1-5 wt% of expansion and shrinkage-reducing components, and 1-5 wt% of reinforcing component, wherein, the expansion and shrinkage-reducing component comprises high-alumina cement and anhydrite according to the weight ratio of 0.5 to 1.5 : 1, and the reinforcing component comprises polycarboxylic acid water reducer powder and siliceous dust according to the weight ratio of 0.05 to 0.15 : 1. The grouting material is prepared by carrying out two stage dry mix on the ingredients. According to the invention, the problem of difficult use of machine-made sand with large amount in the grouting material production is solved; the product has the advantages of high early strength, light expansion, no shrinkage and the like; and the preparation method has the advantages of simple process, low cost, and no secondary pollution. The invention can be widely applied for anchoring foundation bolt, embedding steel bar secondary grouting of device, reinforcing the beams, plates, columns and floors of buildings and the like, having a wide application range.

The invention discloses a cane harvester, comprising a frame, a cutter, a transfer mechanism, a servo mechanism, a power hydraulic system and a corresponding control system, characterized in that: a lifting mechanism is set on the front end of the cane harvester. The lifting mechanism comprises a roll shaft, a hydraulic motor, wherein the roll shaft is mounted on the frame by a connection-rod mechanism and the connection-rod mechanism is driven by a hydraulic device mounted on the frame and the top end of the roll shaft is connected with the hydraulic motor by a connection axle device and a triangle wedge block is set on the lower end of the roll shaft and the hydraulic motor is driven by the power hydraulic system. The cane harvester can be used in sloping field, highland, cane lodging and bending occasion, with good cane-lifting effect and stable running and can normally work for 50-100m.

The invention discloses a material strip granulation production process. The material strip granulation production process comprises the following steps: step 1, processing plastic raw materials by a material strip extruder and extruding plastic material strips; step 2, conveying the plastic material strips to a cooling water tank of material strip traction equipment to be cooled, and conveying the cooled plastic material strips by matching of a first section of conveying crawler belt and rotary rollers; step 3, conveying the plastic material strips to a second section of conveying crawler belt in an inclined state in the material strip traction equipment and carrying out air drying treatment on the plastic material strips by an air drying device; step 4, conveying the plastic material strips which are dried by air into a plate slot in the material strip traction equipment, and reshaping and conveying the plastic material strips by the matching of the second section of conveying crawler belt and the rotary rollers; and step 5, carrying out granulation treatment on the plastic material strips by a granulator. A complete stainless steel net crawler belt is composed of the first section of conveying crawler belt, the second section of conveying crawler belt and a third section of conveying crawler belt; the widths of holes in the stainless steel net crawler belt is less than 2mm; the stainless steel net crawler belt, the material strip extruder and the granulator are synchronously operated at an uniform operating speed.

The invention discloses a belt type heavy transport machine, comprising a main frame, a belt type transport module, a conveying module and a jacking module, wherein the belt type transport module is arranged at the top of the main frame, the conveying module is arranged under the belt type transport module, the jacking module is arranged under the conveying module for lifting the same, and the conveying module moves in the space between the jacking module and the belt type transport module. The belt type heavy transport machine is applicable to transporting heavy objects, has the advantages of being low in noise, high in stability and easy to maintain, and is applicable to the field of industrial and logistic transport.

The invention relates to a submersible cutting sewage pump with efficient hydraulic performance and belongs to the technical field of submersible pumps. The submersible cutting sewage pump comprising a submersible motor is characterized in that the submersible motor is connected with a pump body below through a connection segment to form a cooling and lubricating oil chamber; an efficient large-pass semi-open impeller having a rear cover plate is disposed in the center of the lower portion of the pump body; an inlet edge of each impeller blade is provided with a 30-45-degree large guiding tilt angle from the rear cover plate and a front cover plate, and a center line of an impeller blade outlet pass is flush with a center line of a radial outlet of the pump body; the lower end face of the pump body is connected with a pump base, a cutting disc which is axially adjustable is connected to the upper portion of the pump base, the cross section of the upper end of the cutting disc is completely the same as a flow surface of the front cover plate, projecting to the impeller blade axial surface, in shape, and a 0.2-0.3 mm required gap can be formed between the upper end of the cutting disc and the flow surface of the front cover plate, projecting to the impeller blade, by adjusting axial movement of the cutting disc. The submersible cutting sewage pump is high in hydraulic efficiency, has a wide efficient area, allows suctioning and passage of large particles, and has good effect of impurity cutting and tearing.

The invention relates to a manufacturing equipment assembly of training pants and a manufacturing method thereof. The manufacturing equipment assembly is provided with an absorber production line, a waist production line and a finished product production line, wherein the absorber production line is provided with an absorber manufacturing and conveying unit and an absorber transverse conveying unit which are sequentially and continuously arranged; the waist production line is provided with a waist manufacturing unit, a waist central distance adjusting unit and a waist local breaking and bouncing unit which are sequentially and continuously arranged; the finished product production line is provided with an absorber and waist connecting unit, a waist edge covering unit, a folding unit, a flatly laying unit, a waist enclosing unit, a waist cutting unit, a finished product conveying unit and a stack packaging unit which are sequentially and continuously arranged; and the absorber production line and the waist production line are converged at the absorber and waist connecting unit of the finished product production line. The manufacturing equipment assembly is simple and reasonable in equipment, simple, convenient and reliable in manufacturing process and high in production efficiency, meets the requirement of high-speed production and has higher practicability.

The invention provides a variable speed control device of a variable speed case, which leads the variation ratio to stably return to a low ratio side even after a belt pulley at a driving side stops when in emergency deceleration, and has good production efficiency. The variable speed control device comprises a control unit. A vehicle speed sensor detects the emergency deceleration of a vehicle body (in step S2); after a belt pulley revolution transmitter detects that the belt pulley at the driving side stops (in step S4), when a variation ratio sensor detects that the variation ratio of the variable speed case does not return to the low ratio side which can obtain fully accelerating when restarting (in step S7), and then the control unit drives an actuator, so as to lead a moveable belt pulley half body at the driving side to move to the position of the low ratio side (in step S7). In addition, when the control unit detects a restarting intention of a hitching people according to a detecting signal from an air damper opening degree sensor (in step S12), the moveable belt pulley half body at the driving side is pressed towards a V-shaped transmission belt by the actuator (in step S13), and thus the slippage between the moveable belt pulley half body at the driving side and the V-shaped transmission belt is avoided, and the transmission loss of driving force is decreased when restarting.