HIWIN TECHNOLOGIES CORP. Patent applications |
Patent application number | Title | Published |
20160114491 | WRIST STRUCTURE FOR AN ARTICULATED ROBOTIC ARM - A wrist structure for an articulated robotic arm includes: a wrist body, a rotary member, a signal processing circuit board, a connector, a control unit and a drive unit. The wrist body includes a front end portion, a rear end portion, a receiving portion, and a wiring hole formed in the rear end portion. The rotary member is rotatably connected to the front end portion. The signal processing circuit board is removably disposed at the rear end portion, located inside the receiving portion and includes a gap aligned with the wiring hole. The connector is disposed in the wrist body and signal connected to the signal processing circuit board. The control unit is disposed inside the receiving portion and signal connected to the signal processing circuit board. The drive unit is disposed in the receiving portion to control the rotary member to swing with respect to the wrist body. | 04-28-2016 |
20160114478 | ROBOT TEACHING DEVICE - A robot teaching device is suitable for being signal connected to a controller used to control a robot, and includes: a connecting base which includes an enable switch and a first connector, and is connected to the controller by a transmission wire; a motion device which is removably disposed in the connecting base, and includes a second connector connected to the first connector, and a touch screen for displaying plural virtual keys. The motion device will be wirelessly signal connected to the controller, when it is removed from the connecting base, and the touch screen will display the virtual keys. When the motion device is inserted in the connecting base, and the enable switch is not pressed, the first and second connectors will be connected, and the virtual keys will be switched off. The virtual keys will be switched on after the enable switch is kept being pressed. | 04-28-2016 |
20160108955 | Linear Ball Bearing Guideway - A linear ball bearing guideway is provided with six rows of balls disposed between the slider and the rail, so as to improve the overall load capacity. The six rows of balls are symmetrically disposed at two sides of the head portion of the rail, and the three of the six rows of balls at each side are located at different heights. The neck-portion width of the head portion is smaller than a distance between the two rows of balls disposed at the lowest rail rolling grooves, but larger than the value of a distance between the two rows of balls in the highest rail rolling grooves minus a diameter of the balls, which ensures that the neck-portion width is overly small and affect the stiffness of the rail. | 04-21-2016 |
20160061303 | OFFSET PRELOAD BALL SCREW WITH EXPANDABLE LOADING AREA - An offset preload ball screw with expandable loading area includes: a screw, a nut, and a plurality of balls between the screw and the nut. The inner helical groove of the nut includes at least a first section, a second section and a third section which are continuously connected one another. The preload constantly and smoothly changes in the second section, and the balls can be subjected to loads in positive or negative direction in the second section. Therefore, the running smoothness, precision and load capacity of the ball screw of the present invention is enhanced. | 03-03-2016 |
20160059421 | DEVICE AND METHOD FOR AUTOMATICALLY POSITIONING A CASING - A method for automatically positioning a casing includes: placing the casing onto a shelf with the opening of the casing facing toward a robot arm; controlling a distance between two clamping portions of a clamping device to be larger than a distance between two lateral flat surfaces of the casing, making the support portions located towards the opening and lower than the top inner surface of the casing; using the robot arm to move the support portions through the opening into the casing, making the support portions extend over a gravity center of the casing, and lifting the casing; moving the casing until the casing is stopped against the sucker, and moving the support portions with respect to the casing until the top lateral surface is stopped against the clamping device; and moving the two clamping portions toward each other to clamp the casing. | 03-03-2016 |
20150285355 | Hollow Drive Gear Reduction Mechanism - A hollow drive gear reduction mechanism includes a hollow wave generator, an annular flexible bearing, a flexible wheel, and a rigid wheel. The annular flexible bearing is disposed in and driven to rotate by an elliptical recess of the wave generator. The flexible wheel includes an inner toothed section and is inserted in the annular flexible bearing and has an outer surface abutted against an inner surface of the inner ring, and the flexible wheel is driven to rotate by the annular flexible bearing. The rigid wheel includes a plurality of outer teeth which are different in number from the inner teeth of the flexible wheel, the rigid wheel is inserted in the flexible wheel, and a part of the outer teeth are meshed with the inner teeth. The respective components are hollow structures, and a lateral aperture is formed on the hollow wave generator. | 10-08-2015 |
20150285299 | Linear Actuator - A linear actuator includes a slide, a first half return member, a second half return member and a slide block. The first and second half return members are hollow square frames and sleeved onto the rail. A circulation path can be formed when the first and second half return members and the slide block are assembled together, the second half return member is directly disposed in the first radial gap of the first half return member, and the slide block is directly disposed in the second radial gap of the second half return member. Furthermore, there is no level difference in the first and second return grooves of the two half return members, which will prevent noise caused during movement of the rolling elements, reduce impact of the rolling elements against the circulation path, and therefore extending the life of the linear actuator. | 10-08-2015 |
20150283633 | Angle-Adjustable Thread Processing Machine - An angle-adjustable thread processing machine includes a base, a rocker arm, a rocker-arm toothed wheel, an idle wheel, a driven toothed wheel, and a processing unit. The base includes a power source with a drive shaft. The rocker arm is fixed to the drive shaft which rotates about a drive axis. The rocker-arm toothed wheel is pivotally sleeved on the drive shaft. The idle wheel is pivotally disposed on the rocker arm and engaged with the rocker-arm toothed wheel. The driven toothed wheel is pivotally disposed on the rocker arm to engage with the idle wheel and rotates around a driven axis which is located a first distance D | 10-08-2015 |
20150273703 | Support Arm with a Multiple Degree of Freedom Locking Device - A support arm with a multiple degree of freedom locking device includes a support arm unit, an outer housing unit, a feed screw, a conical push block, and two conical baffles. When the feed screw rotates in a first direction, the conical push block and the conical baffle are driven are rotated to make the outer annular baffle slanting surface press against the inner surface of the pivot space and the first and second pivot portions, so that the lateral housing is unable to pivot with respect to the upper and lower housing, and the first and second pivot portions are positioned between the two ears in a non-rotatable manner, when the feed screw rotates reversely, the lateral housing will be able to pivot with respect to the upper and lower housing, and the first and second pivot portions are able to pivot with respect to the two ears. | 10-01-2015 |
20150233454 | END CAP FOR BALL SCREW DEVICE - A ball screw device includes a screw engaged into a nut member for forming an endless ball guiding passage and for receiving a number of ball bearing members, two end caps are attached to end portions of the nut member and each include a radially and inwardly extended helical bulge for engaging with the helical groove of the screw, and the nut member includes a peripheral protrusion for engaging with the end cap and for preventing the end cap from being moved radially toward the screw and for preventing the screw from being scrapped by the end cap. | 08-20-2015 |
20150233427 | LUBRICATING STRUCTURE FOR LINEAR MOTION GUIDE APPARATUS - A linear motion guide device includes a slider slidably attached onto a guide rail, the guide rail includes a number of recesses and the slider includes a number of depressions aligned with the recesses of the guide rail for forming a number of ball rolling passages, the slider includes a number of grooves offset from the depressions, two end caps attached onto the slider and each include a number of passageways communicating with the grooves of the slider and the ball rolling passages for forming a number of endless ball guiding raceways between the slider and the guide rail and the end caps and for slidably receiving and engaging with the ball bearing device. | 08-20-2015 |
20150230870 | MEDICAL INSTRUMENT HOLDING APPARATUS - A medical instrument holding apparatus includes a shaft slidably engaged into a housing and movable into and out of the housing, the housing includes a guiding member engaged with the shaft for guiding and limiting the shaft to slide relative to the housing only and for preventing the shaft from being rotated relative to the housing, a locking device is engaged onto the shaft and includes a positioning member for engaging with an anchoring member of the shaft and for locking the shaft and the housing together, and one or more fasteners are engaged with the housing and the locking device for securing the shaft and the housing together with the locking device. | 08-20-2015 |
20150230866 | MEDICAL INSTRUMENT HOLDING APPARATUS - A medical instrument holding apparatus includes an attachment device attached to a longitudinal shaft and having a casing, a coupling device attached to the casing of the attachment device, and a carrying device attached to the coupling device, and the carrying device includes an orifice and an aperture, and the aperture of the carrying device is tilted and inclined relative to the orifice of the carrying device, a medical instrument includes an insertion tube engaged into the orifice of the carrying device, and a projecting device is engaged in the aperture of the carrying device for projecting a light onto the insertion tube of the medical instrument at an index mark. | 08-20-2015 |
20150226638 | METHOD FOR DETERMINING TIMING OF OIL FILLING FOR A LINEAR MOTION ACTUATOR - A method for determining timing of oil filling for a linear motion actuator can determine whether the oil film in a specific time period is sufficient, falling or insufficient, and then know the optimum timing of oil filling, by comparing the sum of the slope values within respective time periods with a predetermined value. The method is further capable of determining the timing of oil filling even when the rotation speed of the ball screw changes. The method includes a step of signal acquisition, a step of converting signal, a step of defining and saving eigenvalues, a step of calculating eigenvalues, and a step of determining oil filling. | 08-13-2015 |
20150226311 | WEARING MONITORING DEVICE FOR MOTION GUIDE DEVICE - A motion guide device includes a movable member attached onto an elongated member for forming a ball guiding passage and for receiving ball bearing members between the elongated member and the movable member, a detecting device includes a magnetic member and an insulated tube engaged into a hole of the movable member, and a warning device is coupled between the movable member and the magnetic member for generating a warning signal when the movable member and the magnetic member are electrically connected together with worn particles and for allowing the user to examine and to repair the motion guide device or the ball screw device when required. | 08-13-2015 |
20150204428 | Support Structure for a Ball Screw - A support structure for a ball screw includes a base, two pivot seats mounted on the base, a screw disposed between the two pivot seats, at least one guide rail fixed on the base, a first guide block fixed on the base and provided with a first slanting surface, a second guide block fixed on the base and provided with a second slanting surface, a support seat slidably mounted on the guide rails and located below the screw, a nut unit sleeved on the screw and slidably disposed on the guide rails, and a drive assembly fixed at the nut unit. The support structure for a ball screw has a simple structure, a low maintenance cost and a longer service life. | 07-23-2015 |
20150202780 | ROBOTIC ARM WITH SPHERICAL LINKAGE - A robotic arm includes first and second bent links and a tool link pivotally connected in order, first to third wheels, and first to fourth imaginary axes intersecting at a center of spherical rotation. The first bent link and wheel are driven to rotate about the first and third imaginary axes respectively. A first flexible rope is wound around the first and second wheels and fixed to the second bent link for driving the second wheel and bent link to rotate about the second imaginary axis when the first wheel rotates. A second flexible rope is wound around the second and third wheels and fixed to the first bent link for driving the third wheel and the tool link to rotate about the fourth imaginary axis when the second wheel rotates. The robotic arm is relatively smaller, obstructs the operator less and produces a wider sphere of action. | 07-23-2015 |
20150190934 | LENGTH-ADJUSTABLE MECHANICAL ARM - A length-adjustable mechanical arm includes: a base; a first arm unit having one end formed with a first pivot portion pivoted to the base, and another end formed with a second pivot portion, a second arm unit pivoted to the first arm unit includes a pivot member, an inner sleeve, an outer sleeve and an accessory mounting seat. The length of the second arm unit of the mechanical arm is adjustable by adjusting the inner and outer sleeves, and the second arm unit is switchable between an extended position and a retracted position. Therefore, the mechanical arm can be used for two distance operation. | 07-09-2015 |
20150184696 | DEFLECTING DEVICE FOR BALL SPLINE DEVICE - A ball spline device includes a guide rail engaged into a sliding member and having a number of longitudinal channels and recesses aligned with each other for engaging with ball bearing members, a cylindrical member and a deflecting device are engaged between the sliding member and the guide rail, and the cylindrical member and the deflecting device each include a number of curved guiding pathway communicating with each other for forming a number of endless ball guiding passages in the ball spline device and for engaging with ball bearing members, and the cylindrical member includes a number of protrusions each having a slot for receiving a lubricating fluid to lubricate the ball bearing members. | 07-02-2015 |
20150176657 | DEFLECTING DEVICE FOR BALL SPLINE DEVICE - A ball spline device includes a shaft engaged into a nut member and having a number of longitudinal channels and recesses aligned with each other for engaging with ball bearing members, the nut member includes a number of grooves, and two deflecting devices are engaged onto the shaft and the nut member and each include a number of curved guiding pathways each having an inlet portion communicating with the recess of the nut member for guiding the ball bearing members into and out of the curved guiding pathways of the deflecting devices, and an outlet portion communicating with the groove of the nut member for guiding the ball bearing members into and out of the grooves of the nut member. | 06-25-2015 |
20150174769 | SUPPORT ARM WITH BRAKE MECHANISM - A Support arm with brake mechanism, characterized in that: a resilient component generates a resilient force acting in opposition to gravity, such that a supporting rod can move an object steadily; and, in the course of moving the object, a brake is started as needed to brake the supporting rod and fasten the supporting rod to a predetermined position. | 06-25-2015 |
20150173992 | FORCE FEEDBACK TYPE COMPLAINT ORTHOTIC DEVICE - A Force feedback type compliant orthotic device includes a fixing base, driving unit, first limb supporting unit, and second limb supporting unit. The driving unit has a motor disposed at the fixing base and an output shaft connected to the motor. The output shaft is inserted into a joint base to connect with a resilience unit. The first limb supporting unit has a first supporting element fixed at the fixing base and a first electromyographic signal sensor disposed at the first supporting element. The second limb supporting unit has a second supporting element disposed at the joint base and a second electromyographic signal sensor disposed at the second supporting element. The motor generates appropriate auxiliary power according to the sensing result of the first and second electromyographic signal sensors, such that the first and second supporting elements move relative to each other precisely. | 06-25-2015 |
20150158186 | SCARA ROBOT - A SCARA robot includes a base, a first arm mounted at the base and rotatable on a first imaginary axis, a second arm mounted at the first arm and rotatable on a second imaginary axis, a shaft motor including a fixing member mounted in the second arm and an axle movable relative to the fixing member along a third imaginary axis that is substantially parallel with the first and second imaginary axes, and a rotary motor mounted in the second arm and adapted for rotating the axle on the third imaginary axis. Thus, the SCARA robot facilitates operational control, improves operational precision, voids quick wear of component parts, and lowers maintenance costs. | 06-11-2015 |
20150158185 | ROBOTIC ARM FOR PROCESSING MACHINE - A robotic arm includes a motor, a ball screw spline shaft and a ball nut connected to the motor and attached to the ball screw spline shaft in such a manner that when the motor is started, the ball nut is rotated by the motor, and the ball screw spline shaft is forced to carry a movable seat linearly, causing the movable seat to synchronously move a tension bar to the position where a stopper member at the tension bar is stopped at a mount, and thus the movable seat can be pulled by the tension bar to bias a grip. | 06-11-2015 |
20150147007 | BEARING FAILURE MONITORING DEVICE FOR BALL SCREW - A linear motion guide device includes a movable member attached onto an elongated member for forming an endless multiple-turn, helical raceway between the elongated member and the movable member and for receiving ball bearing members, and a detecting device includes a magnetic member and an integrated circuit disposed in the movable member and arranged close to the endless multiple-turn, helical raceway for detecting a moving frequency or a movement of the ball bearing members through the endless multiple-turn, helical raceway of the linear motion guide device and for detecting a wear or failure of the ball bearing members and for generating a warning signal. | 05-28-2015 |
20150125100 | LUBRICATING STRUCTURE FOR LINEAR MOTION GUIDE APPARATUS - A linear motion guide device includes a slider slidably attached onto a guide rail, an end cap having an inner side attached to the slider, the end cap includes an inlet for receiving a lubricating fluid, two chambers formed in two legs, a passage communicating with the chambers, a guiding pathway communicating with the inlet and the passage for separating the passage into two passageways which are communicating with the chambers of the end cap respectively, and a follower is slidably engaged in the guiding pathway and movable toward either the passageways of the end cap for partially blocking and for limiting the flowing of the lubricating fluid to the passageways of the end cap. | 05-07-2015 |
20150110425 | LINEAR MOTION GUIDE APPARATUS HAVING LUBRICATING OIL WIPING MECHANISM - A linear motion guide device includes a slider slidably attached onto a guide rail, two dust caps oppositely attached to end portions of the slider respectively and each having a channel formed between two legs for slidably engaging with the guide rail, and each having a lip portion directed toward the guide rail for wiping the engaging surface of the guide rail, and the lip portions of the legs of the dust caps each include an inner flange directed toward the slider and each include a number of notches and a number of projections formed in the inner flange of each of the legs and offset from each other for wiping the lubricating fluid into the notches of the legs respectively. | 04-23-2015 |
20150107387 | Harmonic Drive Gear Reduction Mechanism - A harmonic drive gear reduction mechanism includes a rigid inner spline with 2(n+1) teeth and a tooth module of m, a flexible outer spline inserted in the rigid inner spline has 2n teeth and a tooth module of m, a flexible bearing inserted in the flexible outer spline, and a wave generator inserted in the flexible bearing. A thickness between an inner diameter of the flexible bearing and a pitch diameter of the flexible outer spline is t, a cross sectional profile of the wave generator consists four curves, the first and third curves have a radius of curvature R, R=m (n+1)−t, a central angle of the first and third curves is k, and 1004-23-2015 | |
20150033898 | ROBOTIC ARM - In order to reduce the cost of robotic arm, the invention provides a robotic arm, which includes an arm member having a first pivot connection portion, a locating member affixed to the arm member, a sliding member movably mounted at the locating member, a stop member affixed to the sliding member, a wrist member having a second pivot connection portion pivoted to the sliding member and a third pivot connection portion movable relative to the second pivot connection portion, and a driving device including a body member pivoted to the first pivot connection portion and an extension member pivoted to the third pivot connection portion of the wrist member and movable relative to the body member. Using the locating member, the sliding member, the stop member and the wrist member to match with the driving device, the robotic arm achieves the effect of moving and swinging and cost reduction. | 02-05-2015 |
20140334759 | Bearing with Antiskid Design - A bearing with antiskid design used in combination with a circular spline to form a harmonic drive, and the circular spline is provided with an inner toothed portion, the bearing includes: an elliptical gear plug, a flexible ball bearing, and a flexible spline. Between the flexible ball bearing and the flexible spline are disposed a first and second antiskid members, and the arrangement of the first and second antiskid members prevents the axial slippage between the flexible ball bearing and the flexible spline, thus improving stability and transmission accuracy of the harmonic drive. | 11-13-2014 |
20140260734 | MOTION GUIDE APPARATUS - A motion guide apparatus includes a cylindrical member having a peripheral protrusion formed between two outer peripheral recesses, a housing engaged onto the cylindrical member and having a peripheral swelling formed between two peripheral depressions, a number of bearing members engaged between the cylindrical member and the housing, and two actuating ring members each having a number of orifices for engaging with the bearing members and each having an inner side portion directed toward the peripheral protrusion and the peripheral swelling, and each having an operating device extended into the gap that is formed between the peripheral protrusion and the peripheral swelling for wiping the lubricating oil. | 09-18-2014 |
20140260729 | LINEAR MOTION SYSTEM WITH AUTOMATIC LUBRICATOR - A linear motion system includes an elongated shaft, a movable member mounted at the elongated shaft, a lubricator unit defining therein a grease storage container for storing a lubricating grease, a motor mounted in the grease storage container, a lubricating grease guide connected to the motor, a controller mounted in the grease storage container, and a sensor adapted to provide an actuation signal to the controller upon movement of the movable member, causing the controller to start the motor in moving the lubricating grease guide to expel the storage lubricating grease out of the grease storage container onto the surface of the elongated shaft so as to achieve a self-lubricating effect. | 09-18-2014 |
20140251391 | Inner-Diameter Quenching Device - An inner-diameter quenching device is provided with a workpiece holding assembly for holding a workpiece to be quenched, a spray cylinder, and a heating coil. The workpiece has a central axis. The spray cylinder is disposed at a first side of the workpiece holding assembly and driven by a lifting assembly to move along the central axis into an inner diameter of the workpiece. The heating coil is disposed at a second side of the workpiece holding assembly and located on and movable along the central axis. The heating coil and the spray cylinder are separated and movable in opposite directions along the same center axis, which can further reduce the size of the quenching device, making it suitable for quenching a small inner-diameter workpiece. Besides, the spray apertures are inclined, so that the cooling liquid can be sprayed out more easily to enhance the quenching effect. | 09-11-2014 |
20140251050 | LOAD ADJUSTABLE BALL SCREW DEVICE - A ball screw device includes a screw engaged into two nut members for forming a ball guiding passage between the nut members and the screw member and for receiving and engaging with bearing members, and a load applying device is disposed on the screw member and disposed between the nut members and applies a load onto the nut members in order to force and move the nut members away from each other and so as to apply a force onto the ball bearing members and in order to stably anchor and retain the ball bearing members between the nut members and the screw member and in order to facilitate a movement between the nut members and the screw member. | 09-11-2014 |
20140222201 | DIRECTIONAL POSITION CONTROL METHOD - A directional position control method uses an instructor device and a controller to control motion of a robot, and a directional-control starter is used to actuate a directional control function. The directional-control starter controls the controller to drive the robot to move according to the instructor direction reference by converting the coordinate of the robot into the coordinate of the instructor. The directional position control method allows the movement direction reference of the robot to be defined manually or automatically, so that the robot can be moved based on the instructor direction reference of the instructor, allowing the operator to operate the robot by intuition without too much discretion, consequently reducing difficulty and error in operating the robot. Besides, the operator can control the robot by staying at the location where the instructor is located, without standing close to the robot, therefore, improving safety of operating the robot. | 08-07-2014 |
20140174232 | ROLLER ELEMENT RETAINER FOR BALL SCREW DEVICE - A motion guide device includes a ball nut attached onto a shaft and having helical grooves for forming a ball guiding raceway between the ball nut and the elongated shaft and for receiving ball bearing elements, a circulating device attached to the ball nut and having a pathway communicative with the raceway for forming an endless ball guiding passage between the ball nut and the elongated shaft and the circulating device and for engaging with bearing elements, and a retaining device includes a shorter chain for engaging into the helical grooves or raceway of the screw shaft and the ball nut, and a longer chain for engaging into the pathway of the circulating device. | 06-26-2014 |
20140083224 | EXTERNAL CIRCULATION TYPE BALL SCREW DEVICE - The invention provides an external circulation type ball screw device comprising screw shaft and nut having first and second screw grooves. A circulation member comprises first leg, second leg and connection portion. The first leg comprises a first end surface having first inner and outer points, and the second leg comprises a second end surface having second inner and outer points; first and second entrances formed on the first and second end surfaces of circulation passage; first and second thickness respectively provided between the first entrance and the first inner and outer points thereof; the second thickness being greater than the first; the third and fourth thickness respectively provided between the second entrance and the second inner and outer points thereof; the fourth thickness being greater than the third. The groove wall of the second screw groove occupied and the occurrence of broken teeth of the nut are reduced. | 03-27-2014 |
20140033847 | MOTION TRANSMISSION MODULE WITH A COOLING DEVICE - A motion transmission module with a cooling device is aimed at solving the disadvantage of the conventional motion transmission module that the cooling structure of the conventional motion transmission module would increase the length or outer diameter of the nut. The nut is formed with a flat surface for mounting the cooling device, so that the length of the nut won't be increased. Furthermore, the cooling device also serves as a positioning block to fix the return member, it doesn't increase the outer diameter of the nut. | 02-06-2014 |
20130313302 | FEEDING DEVICE - A feeding device includes a fixing base. A motor is fixed to the fixing base. The motor has an output axle. A transmission axle is fixedly connected to the output axle. The feeding device further includes a feeding block having a side fixedly connected to the transmission axle. The feeding block has a feeding notch. The feeding notch is formed around the transmission axle circumferentially. Hence, once a slender material enters the rotational space of the feeding block, the motor drives the feeding block to rotate, whereas the slender material is pressed by the feeding notch of the feeding block and sent out as a result of the continuous rotation of the feeding block. Hence, the feeding device not only enables continuous material conveyance but also allows the slender material to be conveyed smoothly even when the slender material is slightly bent or deformed. | 11-28-2013 |
20130256063 | LUBRICATING DEVICE FOR LINEAR TRANSMISSION MECHANISM - A lubricating device used in a linear transmission mechanism is disclosed to include a housing having an accommodation chamber and an opening formed on the inside and periphery thereof in equal cross section, a pressure member axially movable in the accommodation chamber, a screw rod pivotally mounted in the housing and having a first transmission portion located on one end thereof and extended out of the pressure member, a screw nut threaded onto the screw rod and driven by the screw rod to stop against the pressure member outside, a transmission member defining therein a transmission slot and a second transmission portion and a third transmission portion at two opposite sides of the transmission slot for alternatively rotating the first transmission portion, and driving device for reciprocating the transmission member. | 10-03-2013 |
20120037457 | Lubrication monitoring system for linear transmission device - A lubrication monitoring system for monitoring the lubricative state of two relatively movable elements of a linear transmission device includes a contact resistance capturing device and a processing unit. The contact resistance capturing device for detecting the contact resistance between the two elements and converting it into a corresponding value. A maximum delay time and a threshold value are preset in the processing unit. A period of time during which the linear transmission device starts to run and then the corresponding value reaches the threshold value defines a delay time. If the specific value of the delay time to the maximum delay time is larger than or equal to a predetermined specific one, it will be judged that the lubrication needs resupply. Therefore, monitoring the lubricative state as the linear transmission device is accelerated can get correct lubricative state to enable correct lubrication resupply. | 02-16-2012 |